Can lithium batteries use at high temperatures?

Can lithium batteries use at high temperatures?

With increasing global pollution, energy saving and environmental protection* is finally on the agenda. At present, market are calling for promotion of energy-saving and environmentally friendly products. In China, some related policies have introduced to encourage development and use of energy-saving products. In battery market, lithium batteries have quickly sized the market with their advantages of safety, long service life, low maintenance cost, light weight, complete charge and discharge, and no memory effect. They have become the leader in battery industry and gradually replaced traditional lead acid battery.

Yesterday, some users asked about the temperature range of the use of small-sized lithium batteries. Hebei Xin Power Xiaobian told you that the temperature range of lithium batteries is between minus 40 degrees and 70 degrees above zero. If you don't believe it, then you can see Look at the high temperature use test done by Hebei Xin Power.

Stress relief

The molded or injection molded thermoplastic outer casing shall be constructed to ensure that any shrinkage or deformation of the outer casing material does not expose the internal components when the internal stress generated by the molding or injection molding is released. The sample casing should not undergo physical deformation that would result in exposure of the internal components.

Test Purpose: The stress relief test is an ability to simulate the integrity of a lithium battery after it has been subjected to an appropriate high temperature. Equipment: such as high temperature test chamber.

Note: The stress relief test needs to pay attention to the following points: (1) This test is only carried out on a molded or molded thermoplastic lithium battery; (2) The test chamber is heated to 70 °C ± 2 °C before the test. The sample is placed in the test chamber instead of being warmed up after the sample is placed. After the test, the sample is taken out to room temperature instead of returning to room temperature in the test chamber; (3) if the sample is fired, exploded, etc. during the test. Destruction is also considered unqualified. (It is recommended to use tools such as clips when taking samples to avoid burns. The samples after the test should be placed in a dedicated explosion-proof box and left for more than two hours.)

High temperature use.

The sample should be sufficiently safe to use under high temperature conditions. Compliance is checked by the following high-temperature use test: the full-charge sample is placed in a high-temperature test chamber, and the temperature in the test chamber is set to the upper limit charge temperature and discharge upper limit temperature of the lithium battery specified by the manufacturer, the upper limit charge temperature and discharge of the battery. The upper limit temperature and the value of * in 80 °C. After the surface temperature of the sample is stable, it is kept for 7 hours.

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The sample shall meet one of the following requirements: (1) cut off the circuit, and do not ignite, explode, or leak liquid; (2) the circuit is not cut off, and the charging and discharging method during the high temperature test continues with a discharge charging cycle. No fire, no explosion, no leakage.

Test Purpose: This test simulates the safety of lithium batteries when used in high temperature environments. For example, a mobile phone that is in a standby or in-vehicle state of charge is forgotten in a car that is exposed to the sun for a long time. Equipment: such as high temperature test chamber, charge and discharge tester, etc.

Note: Lithium battery high temperature test needs to pay attention to following points: (1) High temperature retention time 7h to start timing after balance sample surface temperature, if time of one discharge charging cycle is more than 7h, the high temperature test time can be extended to end of charge The discharge cycle; (2) The test temperature select the upper limit lithium battery temperature (such as 40 ° C) and upper limit of discharge temperature (such as 55 ° C), the upper limit of battery charge (such as 45 ° C) and upper limit of discharge temperature (such as * value in 60 ° C and 80 ° C, in general: lithium battery charging upper limit temperature ≤ battery charging upper limit temperature <80 ° C, lithium battery discharge upper limit temperature ≤ battery discharge upper limit temperature <80 ° C, so the test temperature is chosen to be 80 ° C. (3) Since air flow in the test chamber accelerates heat transfer, causing heat loss on the surface of the battery during charging and , it may be necessary to reduce the wind speed to minimize the influence on the sample.

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