Why Washing Resistance is the New Frontier for Battery Safety ? In the era of wearable technology, a new safety hazard has emerged: accidental laundry. Consumers frequently forget their TWS earbuds, smartwatches, or fitness trackers in pockets, sending them through rigorous washing and spinning cycles. For lithium-ion batteries, The combination of alkaline detergent, high temperature, and high-speed centrifugal force can be catastrophic, leading to leakage, fire, or explosion.

To address this, the GB 31241-2022 standard (Safety specifications for lithium-ion batteries and battery packs used in portable electronic equipment) introduced a mandatory Washing Test (Clause 8.8). Our lithium battery washing test chamber (Model: WEW-BT-31241-4e) is engineered specifically to meet this rigorous requirement. Whether you are targeting the Chinese market or establishing high internal safety standards for global R&D, this machine is your definitive solution for washing resistance testing. Don’t let alaundry acciden become a PR disaster. Ensure your lithium batteries can withstand the wash cycle with our certified lithium battery washing test chamber.

Equipment Model	WEW-BT-31241-4e (Washing Test)
Control Method:	Touch Screen Control
Drive Method:	Servo Motor Drive
Solution Temperature Range:	Room temperature ~ 80℃ (adjustable), commonly used temperature is 45±2℃
Test Turntable Outer Diameter:	Ø500 ±10mm
Test Inner Barrel Diameter:	Ø650 mm
Test Inner Barrel Depth:	600 mm
Turntable Speed:	1-800r/min Adjustable
Inner Chamber Material:	SUS#304 stainless steel, thickness 2.0mm
Outer Chamber Material:	Cold-rolled steel plate with painted finish, Thickness 1.5mm
Observation Window:	300x400mm tempered glass, transparent window with stainless steel mesh;
Lighting Device:	A light is installed on the transparent window for easy observation of the test status of the product.
Test Time:	Adjustable from 0 to 99 Hours
Temp Control Method:	P.I.D Control
Washing solution:	Prepare a solution with a pH of 11.0±0.1 (0.004% NaOH solution can be used), and heat the solution to (45±2)℃
GB 31241-2022 Clause 8.8 Immersion Test:	Fix the sample on the rotating device (washing paddle), then place the sample in the solution (the height of the battery center from the liquid surface is 300mm±10mm) and immerse for 0.5h. Maintain the solution temperature at (45±2)℃ during the experiment.
Stirring Comment:	Fix the sample on the rotating device and rotate it in the solution for 0.5 hours at a speed of 60 rpm
Dehydration:	Remove the solution and rotate for 10 minutes at a speed of 800 rpm.
Drying Test:	Place the sample in a high-temperature chamber and heat it for 0.5 hours at a temperature of 45°C ± 2°C
Drain Valve:	Located at the bottom rear of the machine, this valve can be manually opened to drain water from the tank.
Internal Tank Dimensions:	900x900x650 mm (WxDxH)
External Dimensions:	1200x1150x1900 mm (WxDxH)
Equipment Weight:	385.0 KGS
Power Supply:	AC220V, 50 Hz, 1 Phase
Power Consumption:	8.5 KW (Max)

While international standards like IEC 62133 focus on electrical abuse, GB 31241-2022 is unique in its focus on environmental accidents specific to portable electronics.	GB 31241-2022 Washing Test (Clause 8.8)
The Battery Washing Test is not a simple waterproof test. It is a dynamic simulation that pushes the battery to its mechanical and chemical limits:
1. Solution Preparation: The battery is immersed in an alkaline solution (pH 11.0 ± 1.0) simulating laundry detergent.
2. High-Temperature Soaking: The solution is heated to 45°C ± 2°C (or higher depending on custom requirements) to accelerate chemical corrosion.
3. Agitation & Spinning: The test involves complex cycles of stirring (washing) and high-speed dehydration (spinning), testing the structural integrity of the battery seal under centrifugal force.
Note: Pass Criteria: After the washing and drying cycle, The battery must not fire, explode, or leak liquid.

GB 31241 8.8 wash test applies to the following products: ① Lithium-ion battery packs for handheld electronic products; ② Lithium-ion battery packs for portable electronic products that can be carried or used in a pocket; ③ Other portable electronic products with pocket-sized battery packs; ④ Handheld electronic products with non-user-replaceable batteries/battery packs. To ensure the precision of test results and the longevity of the WEW-BT-31241-4e, Please ensure the equipment is installed in a laboratory environment that meets the following criteria:

The laboratory temperature should be maintained between 0°C and 35°C. Relative Humidity: Relative humidity should not exceed 85% R.H.	Temperature & Humidity:
The site should have an atmospheric pressure of 86 ~ 106 kPa and be free from strong mechanical vibrations.	Atmospheric Pressure & Stability:
The equipment must be installed away from direct sunlight and other sources of direct heat radiation to prevent temperature interference during testing.	Environmental Exposure:

Unlike modified household washing machines which lack precision, WEW-BT-31241-4e is a lab-grade instrument designed for repeatability and accuracy. We utilize a high-end Servo Motor instead of a standard frequency motor. This ensures:	1. Precision Servo Motor Drive
* Accurate Speed Control: Precise regulation from 1 to 800 rpm. * Stable Torque: Maintains consistent rotation speed even when testing heavier battery packs, ensuring the centrifugal force is exactly as required by the standard.
The test chamber is equipped with a heating system capable of maintaining solution temperatures from Room Temperature up to 80°C. This covers the standard 45°C requirement and allows for “stress testing” at higher temperatures for R&D purposes.	2. Advanced Temperature Control
* Inner Chamber: Constructed from 2.0mm thick SUS#304 Stainless Steel. This offers superior resistance to the corrosive alkaline solutions (pH 11) used during testing. * Safety Viewing: A large 300x400mm tempered glass window protected by a stainless steel mesh ensures operator safety in case of battery thermal runaway.	3. Industrial-Grade Durability

●	Q: Why do I need a specific Battery Washing Tester instead of a home washing machine?
●	A: Household machines cannot precisely control the RPM (speed) or maintain the strict temperature (45°C) required by GB 31241. Our chamber uses a servo motor to guarantee the exact test conditions (e.g., 800 rpm) are met for certification.
●	Q: Is this test only for the China market?
●	A: While GB 31241-2022 is a Chinese standard, major international brands (like Apple, Samsung, and Sony) adopt this test for their wearable devices because it simulates a very common real-world accident. It is considered a “best practice” for global battery safety.
●	Q: Can this machine perform the spinning (dehydration) cycle?
●	A: Yes. With a maximum speed of 800 r/min, the WEW-BT-31241-4e effectively simulates the high-speed spinning cycle of a washing machine, which is critical for testing the mechanical strength of the battery seal.
●	Q: What types of batteries is this suitable for?
●	A: It is designed for lithium-ion batteries and battery packs used in portable electronic equipment, especially those small enough to be carried in a pocket (e.g., TWS earbuds, smartphones, smartwatches).