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Address: Shenzhen City, Baoan District, Shajing Street, Nga side of the school of Wei Juji Industrial Park, Building A 1 ~ 2 floor, Building C 3 floor
Drop Test
After fully charging the battery according to the test method specified in 4.5.1, it is dropped freely from a height of 1m onto a concrete slab.
Two end faces of cylindrical and button type batteries were dropped once each, and the cylindrical surface was dropped twice, for a total of four drop tests; Square and soft pack
Each side of the battery was dropped once, and a total of six tests were conducted.
The battery should not catch fire or explode.
Drop testing is an important testing method for evaluating the safety and structural integrity of batteries in the event of accidental drops. By simulating the situation where a battery falls from a certain height onto a hard surface (such as a concrete slab), detect whether the battery will cause dangerous situations such as fire, explosion, and leakage. The following is the detailed content of the drop test:
1. Test purpose
Assess the safety and structural integrity of the battery in the event of a drop.
Ensure that the battery does not cause dangerous situations such as fire or explosion in case of accidental drop.
Verify whether the battery meets relevant safety standards and requirements.
2. Testing principle
By freely dropping the battery from a specified height (such as 1 meter) onto a hard surface (such as a concrete slab), simulate the possible drop situations that may occur in actual use, and test the appearance, structural integrity, and safety of the battery.
3. Testing methods
(1) Test preparation
Fully charge the battery according to standard methods.
Prepare concrete slabs or other hard surfaces as drop platforms.
(2) Drop test
Cylindrical and button type batteries:
Drop the two end faces of the battery once and the cylindrical surface twice, for a total of four drop tests.
Square and flexible packaging batteries:
Drop each side of the battery (usually six sides) once for a total of six drop tests.
Drop height: 1 meter.
Drop method: Free fall, ensuring that the battery hits the concrete slab with the specified surface or end face.
(3) Check after testing
Check the appearance of the battery for damage, deformation, leakage, and other phenomena.
Observe whether there are any dangerous situations such as fire or explosion in the battery.
Measure the voltage and internal resistance of the battery to evaluate whether its electrical performance is normal.
4. Testing standards
International standards:
IEC 62133 (Safety requirements for portable sealed secondary batteries).
UN 38.3 (Safety testing for transportation of lithium batteries).
Industry standards:
GB 31241 (Safety Requirements for Lithium ion Batteries for Portable Electronic Products, China).
JIS C 8712 (Safety Requirements for Nickel Metal Hydrogen Batteries, Japan).
5. Testing equipment
Drop testing machine: used for precise control of drop height and drop mode.
Concrete slab: As a drop platform, it simulates a hard surface.
Voltage and internal resistance tester: used to measure the electrical performance of batteries.
Infrared thermal imaging device: used to monitor temperature changes after battery drop.
6. Data analysis and evaluation
Appearance inspection: Record whether the battery is damaged, deformed, leaking, etc.
Safety assessment: Observe whether the battery has any dangerous situations such as fire or explosion.
Electrical performance: Measure the voltage and internal resistance of the battery to evaluate whether its electrical performance is normal.
7. Common problems and solutions
Battery damage: It may be due to insufficient strength of the casing material, and a higher strength material needs to be replaced.
Leakage: It may be due to insufficient battery sealing, and the sealing design of the battery needs to be improved.
Fire or explosion: It may be due to internal short circuit or material failure of the battery, and the battery design and production process need to be optimized.
8. Application scenarios
Battery testing for consumer electronics products such as mobile phones, laptops, and tablets.
Electric tools: such as battery testing for electric drills and chainsaws.
Electric vehicles: such as testing of electric vehicle power batteries.
Energy storage system: such as testing of solar energy storage batteries.
9. Test report
Test conditions: including drop height, drop frequency, drop surface, etc.
Test results: including appearance inspection results, safety assessment, electrical performance, etc.
Conclusion and Suggestions: Evaluate whether the sample meets the relevant standards and propose improvement suggestions.
Through drop testing, the safety and structural integrity of batteries can be comprehensively evaluated in the event of accidental drops, ensuring that they can meet safety requirements in practical use and providing scientific basis for battery design and optimization.
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