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Test method for safety grade evaluation of lithium ion battery

A lithium-ion battery, safety-level technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as thermal runaway, sample swelling, self-heating, etc., achieve effective control, reasonable test content, and reduce detection workload Effect

Inactive Publication Date: 2017-06-13
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (2) Risks brought by lithium-ion battery manufacturing:
The test items take no fire, no explosion, etc. as the criteria for passing or failing. However, during the actual test process, the sample may appear bulging, self-heating, smoke, liquid leakage, sparks, deformation, etc. Will the above phenomena eventually occur? Thermal runaway and fire and explosion cannot be judged, and there are still safety risks

Method used

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  • Test method for safety grade evaluation of lithium ion battery
  • Test method for safety grade evaluation of lithium ion battery
  • Test method for safety grade evaluation of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] For new products whose safety performance is unknown, the safety level is determined by the following tests:

[0043] Short circuit test:

[0044] 1) At 25°C, put a single battery in the environmental chamber and let it stand for 30 minutes to ensure that the overall temperature of the single battery is consistent with the temperature in the environmental chamber;

[0045] 2) Perform short-circuit excitation to the single battery in step 1), the short-circuit resistance is 10min;

[0046] 3) Record the voltage, short-circuit current and temperature changes of the short-circuit battery, and test the state and weight of the single battery before and after the experiment.

[0047] Overcharge test:

[0048] 1) At 25°C, put a single battery in the environmental chamber and let it stand for 30 minutes to ensure that the overall temperature of the single battery is consistent with the temperature in the environmental chamber;

[0049] 2) Excite the single battery in step 1)...

Embodiment 2

[0066] For products using safety technology, the safety level is determined by the following tests:

[0067] Heating test:

[0068] 1) At 25°C, put a single battery in the environmental chamber and let it stand for 30 minutes to ensure that the overall temperature of the single battery is consistent with the temperature in the environmental chamber;

[0069] 2) Heating the single battery in step 1), the heating temperature is 150°C, and the heating time is 60 minutes;

[0070] 3) Record the voltage and temperature changes of the heating battery, and test the state and weight of the single battery before and after the experiment.

[0071] Short circuit test:

[0072] 1) At 25°C, put a single battery in the environmental chamber and let it stand for 30 minutes to ensure that the overall temperature of the single battery is consistent with the temperature in the environmental chamber;

[0073] 2) Perform short-circuit excitation on the single battery in step 1), the short-circ...

Embodiment 3

[0086] For products that have passed the low and medium safety tests, the following tests are used to determine whether they meet the high safety level. The test samples are from the same batch of products.

[0087] 1) At 45°C, put a single battery in the environmental chamber and let it stand for 60 minutes to ensure that the overall temperature of the single battery is consistent with the temperature in the environmental chamber;

[0088] 2) Short-circuit the single battery in step 1), the short-circuit resistance is 10min;

[0089] 3) Record the voltage, short-circuit current and temperature changes of the short-circuit battery, and test the state and weight of the single battery before and after the experiment.

[0090] 65°C short circuit test:

[0091] 1) At 65°C, put the single battery that has passed step 3) into the environmental chamber, and let it stand for 60 minutes to ensure that the overall temperature of the single battery is consistent with the temperature in...

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Abstract

The invention provides a test method for safety grade evaluation of a lithium ion battery. The test method comprises three of the following six types of test methods: short circuit, overcharging, over discharging, heating, extruding, and needling. The test method has the following advantages that a method for verifying the safety of lithium ion battery products in different stages is provided; a more rigorous safety test method is put forward, and the prediction of safety risks of the lithium ion battery is more targeted; an existing method for judging the safety of the lithium ion power battery is supplemented, and a suggestion for battery module safety design is put forward.

Description

technical field [0001] The invention belongs to the field of secondary batteries, in particular to a method for testing the safety of secondary batteries. Background technique [0002] As the core component of new energy vehicles, lithium-ion power batteries have always been concerned about their safety. With the rapid growth of new energy vehicle production and sales, safety accidents have also increased significantly. According to incomplete statistics, from 2011 to the end of 2015, there were 39 electric vehicle safety accidents at home and abroad. From this, it can be inferred that lithium-ion battery products that have passed the test of safety regulations and standards still have the risk of safety problems. Moreover, lithium-ion power batteries have higher energy density than lithium batteries for mobile phones and laptops, so the safety risks are also higher. [0003] The danger of lithium-ion batteries mainly comes from the following aspects: [0004] (1) The ris...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3865
Inventor 崔义唐玲刘宝卢世刚
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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