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Battery Warning & Tips

Customer shall ensure strict compliance with the following cell application conditions:

1.Customer shall configure a battery management and monitoring system to strictly monitor, manage and protecteach cell,and provide detailed information of the BMS, including but not limited to its design, features, setting, and data file format to EVE for design review and record keeping.And a battery management archive shall be established to keep all monitoring data of the cells, so as to be a reference for problems tracing and product quality responsibility division.Battery manufactures are not responsible for product quality assurance if no complete monitoring data of the battery system during its service life is provided.

2. Waterproof and dust-proof  problems shall be fully considered in the pack design, and the pack must meet the waterproof and dust-proof grade stipulated by relevant national standards. EVE is not responsible for the damage (such as corrosion, rust, etc.) of the cell caused by waterproof and dust-proof problems.

3.It is forbidden to mix different types of cells in the same battery system, otherwise, battery manufactures will not be responsible for the quality assurance.

4.The design of the BMS shall meet the safety voltage and operating temperature limitations. 

5.It’s prohibited to charge the cell at low temperatures (lower than 0℃) and the minimum safety temperature of this specification, otherwise EVE will not be responsible for any quality assurance liability. The heat dissipation design of pack may affect cell electrical performance, EVE will not be responsible for any liability regarding cell quality issues caused by the pack heat dissipation design.

6.If the cell charging voltage exceeds the cut-off voltage, corresponding protective actions need to be taken. If the cell discharging voltage reaches the cut-off voltage, it is necessary to charge as soon as possible to prevent it from being over-discharged. EVE shall not be responsible for any cell quality issues caused by over-discharge and exceeding the protection voltage.

Safety Precautions 

*It is strictly forbidden to immerse the cell in water. When it is not in use, it should be placed in a cool and dry environment.

*Do not over-charge the cell. Otherwise, cell overheating and fire may occur. During cell installation and use, hardware and software must be protected against multiple over-charge failures. See 4.3 of this specification for the minimum requirements of protection.

* It’s necessary to set a reasonable charging time limit, otherwise, the cell may overheat, resulting in thermal runaway or fire. BMS management failure of this kind shall be considered during module design.

*If improper charge termination occurs, the root reasons shall be found and resolved before reuse to avoid negative effects on electrical and safety performances.

* It is forbidden to over-discharge. During the normal use of the cell, charge the cell regularly to keep the voltage above 2.8 V, so as to avoid over-discharge.

*It is forbidden to use or place the cell at a high temperature environment. Otherwise, cell overheat, function failure or life shorten may occur.

*The temperature of the cell shall not exceed 65℃ in any normal use, otherwise the BMS must shut down the celland stop cell operation.

* Please use a special charger for lithium-ion batteries when charging.

*During use, please connect the positive and the negative of the cell strictly according to the labels and instructions, and reverse charging is forbidden. 

* It is forbidden to use metal to directly connect the positive and the negative of the cell to short-circuit. Otherwise, strong current and high temperature may cause personal injury or fire.

*It is forbidden to transport or store the cell with metal, such as hairpins, necklaces, etc.

*It is forbidden to knock, throw, step on or bend the cell.

*It is forbidden to directly weld the cell. 

*It is forbidden to directly pierce the cell with nails or other sharp objects.

*Prevent the cell from mechanical shock, collision and pressure impact. Otherwise, the cell may be short-circuited 

internally, resulting in high temperature and fire.

* It is forbidden to use it in places with strong static electricity and strong magnetic fields; otherwise cell safety protection devices may be damaged and cause safety hazards.

*Customer shall securely fix the cell to a solid surface and bind the power cord in a proper place to avoid arcing and sparks caused by friction.

* It is forbidden to use plastic for cell encapsulation and electrical connection. Improper electrical connection may cause overheat during cell use.

*If the cell leaks and the electrolyte spills onto the skin or clothes, immediately wash the affected area with runningwater. If the cell leaks and the electrolyte enters the eyes, mouth, nose and other open parts of the human body, immediately wash with plenty of water and seek medical treatment immediately, otherwise serious injuries will be caused to the human body. No person or animal is allowed to swallow any part of the cell or any substance contained in the cell.

*If the cell emits peculiar smell, heat, discoloration, deformation, or any abnormality during use, storage, or charging, immediately remove the cell from the device or charger and stop using it.

*It is prohibited to disassemble the product without the written consent of battery manufacture

Battery End-life Management

The cell life is limited. Customers should establish an effective tracing system to monitor and record the internal resistance and capacity of each cell during its life. The measurement method and calculation method of internal resistance and capacity need to be discussed and agreed between the customer and EVE. When the internal resistance of the cell in use exceeds 150% of the initial internal resistance, or the capacity is less than 60% of nominal capacity, the cell should not to be used any more.Violation of this requirement will exempt battery manufacture from its responsibility for product quality assurance in accordance with the product sales agreement and this specification, as well as all related liabilities such as loss compensation caused thereby.

Cell Compression Force 

When forming modules, a compression force in the direction of vertical thickness is applied to the cells in order to make them better arranged and fixed. If the compression force is too large, the cells may be damaged or even leak. Cell compression force test conditions are as follows:

Compression area 173.7 mm × 204.6 mm (L × H2)

Compression speed 0.02 mm/s

Compression direction Y axis direction

Cell SOC 15 % ~ 40 %

Recommended compression force  3000 N ~ 7000 N

Instantaneous maximum compression force ≤ 10000 N

The compression force of the cell shall be no larger than 10000 N, otherwise the cell may be damaged.

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