Lithium-ion batteries are widely used in various combat systems, submarines, drones, aerospace vehicles and other military equipment. For military lithium-ion batteries, the performance requirements are higher than those of general life batteries, and they need to undergo better and strict quality testing before they can be used in the military.
SJ 20941-2005 "General Specifications for Lithium-ion Batteries" stipulates the general requirements, quality assurance regulations and delivery preparations for military carp-ion battery cells. Through the standards, we know that lithium-ion batteries need to undergo various tests such as normal temperature/high-low temperature discharge capacity, charge retention capacity, cycle life, fast charging capacity, environment, and safety to ensure quality.
In this issue, we mainly share the environmental testing and testing instrument scheme for lithium-ion batteries. According to the SJ 20941-2005 standard, the environmental tests of lithium-ion batteries include temperature shock, low air pressure, mechanical shock, vibration, and drop tests.
Temperature shock test: cycle test between -40°C low temperature and 70°C high temperature, and carry out four cycle experiments.
Low air pressure: Put it in a vacuum Drying Oven to gradually extract air, reduce the air pressure in the Drying Oven to observe its performance.
Mechanical shock: a relatively simple test method, that is, using an impact testing machine with an impact acceleration of (392±10%) m/s2, the continuous test can be carried out at a time of 6ms±2ms.
Vibration: Vibration is to fix the lithium battery on the vibration table, and then perform sinusoidal vibration with an amplitude of 0.76mm, and the vibration frequency is between 10Hz and 55Hz.
Drop: The battery is dropped freely from a height of 110cm by mechanical means.
The following is a low-end version of the testing equipment list scheme compiled by NBCHAO Technology for the environmental test parameter requirements stipulated in SJ 20941-2005 "General Specifications for Lithium-ion Batteries", as follows:
| Thermal shock test - high-low Temperature Test Chamber | |
 | HT NBC-CDW-100M High-low Temperature Test Chamber |
| Specification parameters: temperature control range -40~150°C, temperature fluctuation ±0.5°C, temperature uniformity ±1.5°C, power supply voltage 3φ 380V, studio size 500*400*500mm, external dimension 1000*1100*1450mm, studio Volume 100L, average cooling rate 1°C/min, nonlinear no-load, non-standard specifications can be customized according to requirements, heating rate 3°C/min, studio material SUS#304 mirror stainless steel (thickness 1MM), outer box material cold-rolled steel Plastic spray treatment or gauze stainless steel (thickness 1.2MM), refrigeration system adopts original French Taikang compressor, environmentally friendly refrigerant R404A and R23A, finned condenser with heat dissipation evaporator, evaporator: finned multi-stage automatic load capacity adjustment , the controller system adopts the original TEM series control system such as TEMI880 color Chinese and English touch-type condenser or TEMI300 English button-type controller, safety device without fuse switch, compressor high pressure, overheating, overcurrent protection, overtemperature protection, fan overload protection, fuse, dry burn protector, water shortage alarm protection, display LCD touch panel | |
| Low Pressure Test - Vacuum Oven | |
 | Kangheng DZF-6020S vacuum Drying Oven |
| Specification parameters: thermostat digital display intelligent temperature controller, temperature control range 50~200 ℃, temperature resolution ±0.5, timing range 0~999min, overall size 450*635*465mm, studio size 280*300*300mm , studio material stainless steel liner, nominal power 0.9KW, power supply voltage single-phase AC220V/50Hz, shipping weight 52.5Kg, outer packaging size 570*720*545mm, vacuum degree <133Pa | |
| Vibration Test - Electromagnetic Shaker | |
 | Domestic ASR-D-Z50 electromagnetic vibration table (touch screen) |
| Specification parameters: test direction up and down, maximum test weight 0-60kg, test platform size 500*500mm, control mode PLC touch screen (the screen directly displays the graph), frequency adjustment range 1-600HZ, precision frequency can be displayed to 0.1HZ, Precision 0.1HZ, amplitude 0~5mm (random type), vibration waveform sine wave, maximum acceleration 10G, function frequency sweep, fixed frequency, programmable, time control, frequency multiplication function (0.01Hz) 8-stage multiple increase ① low to high frequency ②high to low frequency ③low to high and then to low frequency/loopable, logarithmic function (0.01Hz) ①down to up frequency ②up to down frequency ③down to up and down to down frequency--3 modes logarithmic /Recyclable, power supply voltage AC220V 50HZ | |
For more detailed information on military lithium-ion battery environmental test and testing instruments, you can have in-depth exchanges with North and South Tide Technology.
