This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of fixed valve-controlled sealed lead-acid batteries. This standard applies to all fixed valve-controlled sealed lead-acid batteries and battery packs that are used for floating charging in stationary places and combined with fixed equipment or fixed in the battery room for communication, equipment switching, power generation, emergency power supply and uninterruptible power supply or similar purposes. The sulfuric acid electrolyte in the battery is non-flowing, or adsorbed in the microporous structure between the electrodes or in the form of colloid. This standard does not apply to vehicle starting, solar charging and ordinary lead-acid batteries and battery packs. GB/T 19638.2-2005 Fixed valve-controlled sealed lead-acid batteries GB/T19638.2-2005 Standard download decompression password: www.bzxz.net

1CS29.220.20
National Standard of the People's Republic of China
GB/T 19638.2—2005
Stationary valve-regulated sealed lead-acid batteries
Lead-acid batteries for stationary valve-regulated(1EC 60896-2:1995,Stationary lead-acid batteries General requirementsand methods of test-Part 2: Valve reguiated types,NEQ)2005-01-18 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
2005-08-01 Implementation
GB/T19638.2-2005
This standard GB/T19638.2-2005*Fixed valve-controlled sealed lead-acid battery corresponds to JEC60896-2, 1995 General requirements and test methods for fixed lead-acid batteries Part 2: Valve-controlled sealed lead-acid batteries, and is formulated based on the actual content of the current practice in my country. The writing format is in accordance with GB/I1.1-2090 "Guidelines for standardization work Part 1: Structure and editing rules of standards". The degree of consistency between this standard and I:60896-2,1995 is non-equivalent. The main differences are as follows: increased explosion-proof capability; increased anti-fogging capability; increased low temperature sensitivity; added naming of battery models; increased equalization performance of terminal contacts; increased connection voltage drop; increased recharging performance; added the presence and durability of information and warning marks. This standard was proposed by the China Electrical Equipment Industry Association. This standard is under the jurisdiction of the National Lead-acid Battery Standardization Technical Committee. This standard was independently drafted by Shenyang Battery Research Institute, Ministry of Industry and Information Technology, Postal and Telecommunications Industry Product Quality Inspection Center, Harbin Guangyu Battery Co., Ltd., Zhejiang Nandu Power Co., Ltd., Weihai Wenlong Battery Co., Ltd., Zhejiang Wolong Dengta Power Co., Ltd., Qufu Shengyang Power Industry Co., Ltd., etc.
The main drafters of this standard are Yi Xiaobo, Xiong Lanying, Cao Shuihuan, Fei Shuyan, Lin Lequan, Zhang Zhenfang, Tong Bo. 1 Scope
Stationary valve-controlled sealed lead-acid batteries
GB/T 19638.2-2005
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation, rental and storage of stationary valve-controlled sealed lead-acid batteries.
This standard applies to all stationary valve-controlled sealed lead-acid batteries (hereinafter referred to as replacement batteries) and battery packs that are used for floating charging in a stationary place and combined with fixed equipment or fixed in a storage discharge room for communication, equipment switching, power generation, emergency power supply and uninterruptible power supply or similar purposes. The sulfuric acid electrolyte in the battery is non-flowing, or adsorbed in the microporous structure of the electrode system or in the form of colloid.
This standard does not apply to locomotive starting, solar charging and ordinary lead-acid batteries and fire-powered batteries. 2 Normative References
The clauses in the following documents become the clauses of this standard through reference in this standard. For all referenced documents with dates, all subsequent amendments (excluding errata) or revised versions are not applicable to this standard. However, parties that reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all referenced documents without dates, their latest versions are applicable to this standard. G13/T2900.11 Terminology of lead-acid batteries
GIB35781 Hexagonal bolts-full thread-Class C B/I2403 Test method for flammability of plastics
JB/12599 Method for compiling product models of lead-acid lead-acid batteries JB/T3076 Lead-acid battery discharge tank
I3/T394 Acid battery discharge packaging
3 Definitions
This standard adopts (B/T2900, 11 Terminology of battery names and the following definitions. 3.1
Gas emission
The gas emitted by the battery under normal floating charge and overcharge conditions Volume. 3.2
High current tolerance
The ability of the battery structure to withstand short-term abnormal high current discharge. 3.3
Explosion-proof capability
The ability of the exhaust valve device of the battery to prevent external fire sources from igniting internal gases under normal overcharge conditions. 3.4
Acid mist resistance
The ability of the battery to suppress the release of acid mist generated inside to the outside under normal overcharge conditions. 3.5
Ground short-circuit resistance
The ability of the battery to withstand the ground short-circuit current generated by the spread of electrolyte in special working directions. GB/T 19638.2--2005
Flame retardancy of materials
The ability of plastic battery tanks and covers to withstand open flames. 3.7
Thermal runaway sensitivity
The sensitivity of batteries to charging current and temperature under normal overvoltage charging conditions. 3.8
Low temperature sensitivity
The stability of the capacity of batteries in low temperature environments. 4 Symbols
-10h rate rated capacity (Ah), the value is 1.00C::C
3 h rate rated capacity (Ah)-the value is 0.75L1o iG 1 h rate rated capacity (Ah), the value is 0. 55Cn iC.-.-10 h rate actual capacity (Ah);
Ic——l0 h rate discharge current (A), the value is 0. 1CT:---3 h rate discharge current (A), the value is U.25CsIr——1h rate discharge current (A), the value is U.i5Cm (the value of tubular gel battery is 0.48Cn): Umn --
a floating charge voltage (V) of a battery or battery pack, the value is determined by the manufacturer. Battery model and appearance dimensions
5.1 Naming of battery model
The naming of battery model has the following meanings according to J/T2599 standard: 6
5.2 Appearance dimensions of bacteria battery
-13h rate rated capacity, Ah
Sealed
·Valve-controlled
Number of single batteries (1 single battery is omitted) The appearance dimensions of the battery shall be provided by the manufacturer in drawings or documents. 6 Technical requirements
6.1 Structural requirements
6.1. 1. The battery consists of a positive plate, a negative plate, a separator, a battery tank, a battery cover, sulfuric acid (or colloid) electrolyte, terminals, exhaust valves, etc. The battery tank and the battery cover should be sealed so that the gas generated inside the battery cannot be discharged from the exhaust rack. The battery is made up of single batteries connected together.
6.1.2 The positive and negative terminals and polarities of the battery should be clearly marked for connection, and the terminal size should comply with the manufacturer's product drawings. 6.1.3 The battery tank shall comply with the provisions of J13/T3076 standard. 6.1.4 The battery dimensions shall comply with the product drawings or documents of the manufacturer. 6.1.5 The battery appearance shall not have cracks, stains or obvious deformation. GB/119638.2-2005
6.1.6 Except for the exhaust valve, all other parts of the battery shall maintain good sealing and shall be able to withstand 50kla positive or negative pressure. 6.1.7 Battery quality
6.1.7.1 The battery quality shall not exceed the requirements of Table 1. The battery quality in Table 1 is the nominal value: with 1000Ah as the boundary: the quality deviation of less than 1000Ah shall not exceed 8 of the nominal value, and the quality deviation of more than 1000Ah (including 1000Ah) shall not exceed 5% of the nominal value. The lower deviation of quality is unlimited:
6. 1.7.2 The quality of special batteries shall be determined by negotiation between the manufacturer and the user. Table 1 Battery mass
Rated capacity, A5
6.2 Safety requirements
6.2.1 Gas evolution
Mass/kg
Mass/ke
Mass/kg
Test according to 7.7. The average maximum gas released by a single cell per ampere-hour, hour shall meet the following specified values ​​under standard conditions:bzxz.net
a) Under 20% charge condition and single cell voltage U (V) (,0,04 ml./Ahh); b) Under 20℃ and single cell voltage 2.40 (V) charging condition G1.70 mL/(Ahh);6.2.2 High current withstand capability
The battery shall be tested according to 7.8. The spring, pole and busbar shall not melt or fuse. The slot and cover shall not melt or deform. 6.2.3 Short-circuit current and internal resistance level
The battery shall be tested according to 7.9 test, and the short-circuit current value and internal strength calculation value are provided for user reference. 6.2.4 Explosion-proof capability
The battery is tested according to 7.15. When exposed to fire, there should be no combustion or explosion inside. 6.2.5 Acid mist resistance
The battery is tested according to 7.11. The amount of acid mist released for every 1 Ah of charging capacity should not exceed 0.025 mg. 6.2.6 Exhaust valve action
The battery is tested according to 7.12. The exhaust valve should be reliably opened and closed within the range of 1 kPa~~49 kPa. GB/T 19638.2—2005
6.2.7 Short circuit resistance to grounding
The battery shall be tested according to 7.13. There shall be no signs of corrosion or burning and carbonization of the slot cover. 6.2.8 Flame retardant ability of materials
Recommended batteries with flame retardant requirements shall be tested according to 7.14. The flaming burning time of the slot and cover shall be ≤10s; the flaming plus flameless burning time shall be ≤305. 6.2.9 Mechanical damage resistance
The battery shall be tested according to 7.15. The slot body shall not be broken or leaking. 6.3 Usability requirements
6.3.1 Balanced performance of terminal voltage
The battery is tested according to 7.16. The difference between the highest and lowest values ​​of the open circuit terminal voltage is 20nV (2V), 50mV (6V); 100nV (12V); the difference between the highest and lowest values ​​of the terminal voltage in the floating charge state for 24h is AU≤90mW(2V); 240mV(6V):480mV(12V)
6.3.2 Capacity performance
The battery is tested according to 7.17 and the procedure in Table 2. The 10h rate capacity should not be less than 0.95 in the first cycle and should reach Cm within the first 3 cycles. The 3h rate capacity should reach C1h rate capacity should reach r6.3.3 Connection voltage drop
The battery is tested according to 7.18. The connection voltage drop between batteries should be ≤13mV. 6.3.4 Overcharge resistance
The battery shall be tested according to 7.19. Its appearance shall not have obvious deformation and leakage. 6.3.5 Charge retention performance
The battery shall be tested according to 7.20. After storage for 0 days, its charge retention capacity R80%. 6.3.6 Recharge performance
The battery shall be tested according to 7.21. The recharge capacity factor R4 of constant voltage charging for 24 hours (U (V)) shall be 85%: the recharge capacity factor R of constant voltage charging for 758 hours shall be 100%.
6.4 Durability requirements
6.4.1 Cycle durability
The following three requirements can be tested optionally. 6.4.1.1 Float charge cycle durability
The battery shall be tested according to 7.22. The float charge cycle shall be not less than 10 times. 6.4.1.2 Overcharge cycle durability
The battery shall be tested according to 7.23. The overcharge cycle of 2V battery shall not be less than 24 days; 6V and 12V battery shall not be less than 180 days. 6.4.1.3 Accelerated float charge cycle durability The battery shall be tested according to 7.24. The accelerated float charge cycle of 2V battery shall not be less than 180 days; 6V and 12V battery shall not be less than 150 days. 6.4.2 Thermal runaway sensitivity
The battery shall be tested according to 7.25. The temperature rise of the battery shall be 2:T: The rate of increase of the current every 24 hours shall be ≤50%. 6.4. 3 Low temperature sensitivity
The battery shall be tested according to 7.26, with a maximum discharge capacity of 10h rate of C, and shall be ).C%; the appearance shall not show cracks, excessive expansion, and separation of the slot and cover. 6.4.4 Presence and durability of information and warning marks The battery shall be tested according to .27. The single cell or integral battery shall durably display the following information and warning marks: a) The polarity symbols of the positive and negative terminals of the battery (+, - or convex molded on the cover of the nearest terminal. The size of the symbol shall not be less than 5mm.
b) The name, model, rated voltage, rated capacity (C.), and trademark of the battery; c) The specified float charge voltage at 20℃ or 25℃, (1). d) The terminal twist recommended for battery connection (>m). e) The manufacturing place and manufacturer name of the battery. f) Warning symbols given by ISU:
—Electric shock hazard;
…No open flames or sparks allowed
Wear eye protection;
Observe the instruction manual;
Environmental protection and recycling symbols;
—Road waste.
7 Inspection method
7.1 Current measuring instrument
7.1.1 Meter range
GB/T19638.2-—2005
The range of the instrument used is determined by the range value of the measured current and voltage. The reading of the pointer type instrument should be within the range of the last tenth of the range. 7.1.2 Voltage measurement
The instrument used to measure the maximum voltage is a voltmeter with a precision of 0.5 or higher, and its internal resistance is at least 10 000 0/V. 7.1.3 Current measurement
The instrument used to measure current should be an ammeter with a precision of 0.5 or higher. The instrument used to measure current should be an ammeter with a precision of 0.5 or higher. 7.4 Temperature measurement
The thermometer used to measure temperature should have an appropriate range, and each division value should not be greater than 1. The calibration accuracy of the thermometer should not be less than 0.5℃,
7.1.5 Time measurement
The instrument used to measure time should be divided into hours, minutes and seconds, and have an accuracy of ±1 per hour. 7.1.6 Length measurement
The maximum accuracy of measuring the battery's outer dimensions should not be less than 0.1% of the earth's core. 7.1.7 Pressure measurement
The accuracy of the instrument used to measure pressure shall not be less than ±10 7.1.8 Gas volume measurement
The accuracy of the instrument used to measure gas volume shall not be less than 3.5% 7.2 Preparation before the test
7.2.1 Fully charged
a) The battery is charged at a constant voltage of 2.10V ± 0.01V/cell (current limit 2.51tsA) at 20℃--25℃. When the current value is stable for 5h, the battery is considered to be fully charged: b) Follow the full charging method provided by the manufacturer. 7.2.2 The batteries used for the test must be products produced within three months, and after being fully charged, the single battery or battery pack is placed in a vertical position.
7.3 Appearance inspection
Inspect the appearance quality of the battery visually.
7.4 Dimension inspection
Measure the dimensions of the battery with measuring tools of appropriate accuracy. 7.5 Polarity inspection
Inspect the polarity of the battery visually or with a reverse polarity instrument. 7.6 Sealing test
Fill (or release) gas through the hole of the battery exhaust valve. When the positive pressure (or pressure) is 50 kPa, the pressure gauge pointer should be stable. GB/T 19638.2-2005
3 5~~5 5. ​​
7.7 Gas evolution test
7.7.1 After the battery reaches the rated capacity value through the rate capacity test in 7.17 10 b, it is fully charged and float charged at a voltage of [Jln (V) in an environment of 20℃ -~25℃ for 72 h. Record the battery voltage value and check whether there is electrolyte leakage at the battery seal. 7.7.2 After floating charge for 72 h, collect gas according to the method shown in Figure 1 in the floating charge state and continue for 192 h. h. (The maximum distance between the gas collecting cylinder and the water surface should be 20 mm).
Battery
1—battery;
Graduating cylinder,
—water,
1 gas collecting device
7.7.3 Measure the total amount of gas collected in the non-recording 192h V, (mL). During the gas collection period, measure the ambient temperature (℃) and the maximum ambient pressure (kPa) once a day.
7.7.4 Calculate the corrected gas volume V. under the standard state (20℃ 101.3kPa) according to formula (1) (the water vapor force is negligible). P
V.= (273)×101.3
Wherein:
T. Average ambient temperature during the gas collection period, in degrees Celsius (°C)P. —- Average ambient atmospheric pressure during the gas collection period, in kFa; 273·absolute temperature scale, in Kelvin):
—[20+273], in Kelvin (K).
293—
7.7.5 Use formula (2) to calculate the amount of gas released per single battery per ampere-hour under floating charge GG
n——-Recommended number of single batteries;
—10h rate rated capacity.
n×192 xCl
7.7.6 Increase the battery charging voltage to 2.40 V10.01 V/cell and repeat 7.7.2-~7.7.5. 7.8 High current withstand capability test
7.8.1 After 7.17 After the battery that has been fully charged to reach the rated capacity value by the 3 h rate capacity test is fully charged, discharge it at a current of 30u(A) for 3min in an environment of 20℃~25℃.
7.8.2 Check whether the terminals, poles and busbars are melted or blown, and whether the slots and covers are melted or deformed inside and outside the battery, and make records.
Note: During the test, measures should be taken to prevent the danger of battery explosion, electrolysis and molten lead splashing. 7.9 Short-circuit current and internal resistance test
GR/T19638.2--2005
7.9.1 After the battery that has reached the rated capacity value by the 7.173# rate capacity test is fully charged, in an environment of 20℃~25℃, determine the Uf(I) discharge characteristic curve by the two-point determination method. 8 First point (..)
Discharge with current I=4×I:(A) for 20 s.Record the terminal voltage U.value of the battery, and interrupt for 5 min. Determine the second point without recharging.
bSecond point (U,)
Discharge with current I=20×1(A) for 5 s.Record the terminal voltage Li, Note: The terminal voltage should be measured at each end of the battery to ensure that there is no external voltage drop interfering with the test results. 7.9.2 Use the measured two-point voltage value (,) and current value (,) to draw the characteristic curve (Figure 2), and linearly extrapolate the characteristic curve -- "I", when U--{ shows the short-circuit current), and calculate the internal resistance (R).: F
Figure 2I=(I) characteristic curve
From Figure 2, it can be obtained:
7.10 Explosion-proof capability test
7.10.1 The test should be carried out after confirming that the safety measures can be guaranteed. 7.10.2 The battery in the fully charged state is overcharged with a current of 0.5113 (A) for 1 l1. 7.10.3 When the charging is terminated, near the exhaust hole of the battery, use a DC 24V power supply to fuse a 1A-~3A fuse (the fuse is 2mm--4mm away from the exhaust hole) and repeat the test twice. 7, 11 Acid mist resistance test
7. 11. 1 The fully charged battery is charged with a current of 0.5I (A) for 2 h and then the gas collection begins. 7.11.2 Use the method shown in Figure 3 to connect three absorption bottles (500 nL) filled with sodium hydroxide solution and distilled water in series to collect gas for 2 h. The first absorption bottle contains 25 mL of 0.01 mol/L sodium hydroxide solution and 70 mL of distilled water; the second and third absorption bottles contain 1 mL of distilled water respectively: the gas collection time starts from the generation of bubbles in the solution. Battery
Figure 3 Gas collection device for acid-proof test
GB/T 19638.2—2005
7.11.3 Transfer the solution after collecting the gas to a 500ml beaker, wash the first absorption bottle with the solution in the second and third absorption bottles in turn, then wash the absorption bottles uniformly with 50ml distilled water, and add the washing liquid to a 500ml beaker, add 18~20 drops of neutral red, primary methyl blue mixed indicator, and then titrate with 0.01mol/1 hydrochloric acid standard solution until the solution changes from green to blue. 7.11.4 Use a pipette to draw 2ml of 0.01mol/1 sodium hydroxide standard solution as a blank, add distilled water to the solution volume of about 250ml, add 18~20 drops of neutral red, primary methyl blue mixed indicator, and use 0.01mol/1 hydrochloric acid standard solution to titrate until the solution changes from green to blue. Titrate the standard hydrochloric acid solution until the solution [E] turns from green to blue, which is the end point.
7.11.5 Calculate the precipitation amount M (g/Ah) according to formula (3): (V-V))XcX 49. 04 (mg/Ah)
Wherein:
0.SI:x2xn
The amount of standard hydrochloric acid solution used when titrating the air, in milliliters (ml); The amount of standard hydrochloric acid solution used when titrating the sample, in milliliters (rml); The concentration of the standard solution, in molar fraction (mal/L9.2-—0.5 IH.s, the mass of the single stop, in milligram mole (mg/mo!); 2-—When charging-up;
The number of single cells.
7.12 Exhaust valve action test
7.12.1 Connect the fully charged battery to the measuring device according to the force method shown in Figure 1 and place it in a water tank. The distance from the water tank liquid level to the top of the safety valve shall not exceed 5cm.
Safety valve
Connect the differential pressure gauge
[: spherical column-
pressure gauge
battery
Figure 4 Safety valve action measurement system diagram
7.12.2 Carry out the test in an environment of 25℃ ± 5℃. First measure the balance position scale of the U-shaped end column pressure gauge, start the gas pump, and control the pressure at! At atmospheric pressure, slowly open the control valve to pressurize the inside of the battery. At this time, the values ​​in the U-shaped mercury pressure gauge deviate from the equilibrium value. When bubbles appear at the pressurized exhaust valve, record the scale value of the mercury pressure connected to the atmospheric pressure. Then close the control valve and the air pump and observe the bubble generation at the exhaust valve by the natural decompression method. When no bubbles appear, record the scale value of the II-shaped mercury pressure gauge connected to the atmospheric pressure side.
7.12.3 Calculation
Open valve pressure = (P, P.) × 0.1332 (kPa)
Closed valve pressure = (P, P.) × 2 × 0.1332 (kPa) Armament:
P.--water column scale value at equilibrium position, in millimeters (mm): P.--mercury column scale value when the valve is open, in millimeters (m); P--mercury column scale value when the valve is closed, in millimeters (m): 0.1332
1mm column (H) pressure value, in Pascals (kPa) 7.13 Ground short circuit resistance
GB/1 19638.2—2005
7.13.1 Fully charged storage battery is stored in a dry environment of 20℃~25℃ and float charged at 1 (V). In the float charge state, the storage battery is connected to a circuit as shown in Figure 5, where a DC voltage of 1V±13V can be applied between the terminal and the metal lead strip. The tested battery is placed horizontally and the metal lead strip is kept grounded. The sealing part of the slot cover is in direct contact with the metal lead strip as much as possible. Figure 5 Ground short circuit test device
7.13.2 In a dry environment of 20℃:~~25℃·1, the negative pole of the DC voltage is connected to the battery terminal, and the positive pole is connected to the metal lead strip. The circuit is turned on and in this state Keep it in the state for 30 days, and then measure and record the short-circuit current to ground. 7.13. After the temperature reaches 33℃, check and record whether the metal lead strip and the replacement battery have signs of corrosion and burning, as well as the carbonized area of ​​the slot cover.
Sample:
This lamp;
3. Degreased cotton
Figure 6 Vertical combustion test device
7.14 Flame retardant ability test of materials
7.14.1 Cut a piece of sample with a length of (125--5) mm and a width of (13.0·f-0.3) mm from each slot cover of the battery. 7.14.2 Use the clamps on the ring bracket to clamp the upper end of the sample 6 mm away from the upper end of the sample according to the method described above. Keep the long axis of the sample vertical, and make the lower end of the sample about 309 mm away from a horizontally laid layer of dry medical absorbent cotton (50 mm×50 mm×6 mm). GB/T 19638.2-2005
7.14.3 Light a Bunsen burner at a distance of about 1:0mm from the sample, and adjust the gas flow so that the lamp tube produces a blue flame (201.2mm high) when it is in the vertical position.
7.14.4 Aim the flame of the Bunsen burner at the center of the lower end of the sample, and keep the distance between the center of the top surface of the Bunsen burner tube and the lower end of the sample at 10m, and light the sample for 10 seconds. If molten or burning material drips from the sample during the application of the flame, tilt the Bunsen burner at an angle of 45C in the width direction of the sample and retreat a sufficient distance from the bottom of the sample to prevent the dripping material from entering the lamp tube. In addition, keep the distance between the remaining part of the sample and the center of the top surface of the Bunsen burner tube at 10m. mm
7.14.5 After applying 10% of the flame to the sample, immediately move the Bunsen burner to at least 150m away from the sample and use a timer to measure the sample's flaming burning time 1:
7.14.6 After the sample's flaming burning stops, immediately apply 10% of the flame again according to the above method. Keep the remaining part of the sample 10mm away from the mouth of the Bunsen burner. After the flame application is completed, immediately move away from the Bunsen burner and measure the sample's flaming burning time t: and flameless burning time. In addition, record whether there are any drips and whether the drips ignite the absorbent cotton: 7.14.7 The sample's flaming burning time (t "1.) should be 108.The second flame plus the flameless burning time (t+t) should be 30s. Note: Flame burning: After the fire source is removed, the material flame continues to burn. No flame burning: After the fire source is removed, when there is a flame or no flame shrinkage occurs, the material keeps burning with a glow. 7.15 Mechanical damage resistance
Fully charged batteries are dropped freely twice in an upright state on a solid and slippery cement floor at the height specified below in an environment of 20%-25% humidity. Check and record whether the battery is damaged or leaking. The drop height of batteries less than or equal to 50kg is 10mm; the drop height of batteries less than or equal to 50kg is 50mt; the drop height of batteries greater than 100kg is 23mm. 7.16 Terminal voltage balance performance test
7.16.1 The fully charged battery pack is placed in an open circuit at 20℃~25℃ for 24h. The terminal voltage value of each battery is measured and recorded (the measurement point is at the terminal). The difference between the highest and lowest terminal voltages is calculated. 7.16.2 The battery pack is float charged with a voltage of (V). After 24h of the rated charge state, the floating terminal voltage value of each battery is measured and recorded (the measurement point is at the terminal). The difference between the highest and lowest floating terminal voltages is calculated. 7.17 Capacity performance test
7.17.1 After the battery is fully charged and kept in a static state for 1h~-24h, when the temperature of the battery is 25℃±5℃, a reverse capacity discharge test is performed. 10: The rate capacity is discharged with a current of 1A until the average voltage of the single battery is 1.80V. The 3h rate capacity is discharged with a current of 1A until the average voltage of the single battery is 1.80V. The 1h rate capacity is discharged with a current of 1A until the average voltage of the single battery is 1.75V. The average surface temperature of the battery during the discharge period and the discharge duration T are recorded. 7.17.2 During the discharge period, the terminal voltage of the single battery and the surface temperature of the battery are measured and recorded. The measurement interval is 1h for the 3h rate capacity test; 30min for the 3h rate capacity test; and 0min for the 1h rate capacity test. At the end of the discharge, measurements should be taken at any time to determine the exact time from the discharge of the battery to the end of the discharge.
7.17.3 During the discharge process, the fluctuation of the discharge current shall not exceed 1% of the specified value. 7.17.4 The measured capacity (Ah) is calculated by multiplying the discharge current value I (A) by the discharge duration T (h). 7.17.5 When the average surface temperature of the battery during discharge is not the reference temperature of 25°C, the actual capacity at the reference temperature of 25°C shall be converted according to the public test (4):
C - +/6t- 25)
Where:
The surface temperature of the battery during discharge is in degrees Celsius (°C);
The actual capacity when the average surface temperature of the battery is t(, in ampere-hours (AH);
The capacity when the reference humidity is 25°C, in ampere-hours (AH); f-----temperature coefficient, 1/;C and Cs when f-0. 006:C, when f=0. 01, (4)
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