A repair method for self-discharging unqualified battery

A self-discharge and battery technology, which is applied in the direction of primary battery use/maintenance, secondary battery repair/maintenance, battery recycling, etc., can solve problems such as inability to repair, affect normal application, and unqualified self-discharge detection, etc., to improve Effects of charge retention and storage properties

Inactive Publication Date: 2008-05-28
CHUNLAN GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After the battery is produced, the self-discharge test is unqualified, which affects the normal application. The above method can no longer be repaired. How to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0012] Example 1:

[0013] Select 10 batteries that fail self-discharge in production for testing.

[0014] When the state of charge is 0, the battery is charged for 120% at a current of 0.2C, left on hold for 1 hour, and discharged at 0.2C to a final voltage of 1.0V, and the actual capacity of the battery is calculated.

[0015] Charge the battery 120% with 0.2C current, leave the battery open circuit for 7d at normal temperature, and discharge the battery with 0.2C current to the termination voltage of 1.0V. Calculate the discharge capacity and self-discharge rate of the battery. The results are shown in Table 1.

[0016] When the state of charge of 10 batteries was 0, the shock experiment was carried out with a current of 180A. The shock regime was charging for 2 s, resting for 5 s, and 5 consecutive cycles. After the impact, the battery is discharged with a current of 0.2C to a termination voltage of 1.0V. Then, the battery was charged for 120% with a 0.2C current, the...

Example Embodiment

[0020] Embodiment 2:

[0021] The batteries that fail to pass self-discharge in the production batch shall be subjected to impact treatment according to the above system. After treatment, the batteries were re-tested, and more than 80% of the batteries passed the self-discharge test. Anatomical analysis was performed on batteries that were partially self-discharged and still failed. The main reason is that there is a large short-circuit source inside the battery, or there are obvious burn-through holes in the diaphragm, which cannot be repaired.

[0022] For the battery repaired by this method, all the performance indicators of the test meet the standard requirements, the production qualification rate of the battery is improved, and the cost of the battery is relatively reduced.

[0023] Since MH-Ni, Cd-Ni, Zn-Ni and other batteries all use relatively thin plates, burrs and other phenomena will inevitably appear in the battery production process, and there are also Co dendri...

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PUM

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Abstract

The invention discloses a method to repair self-discharge and unqualified batteries. An instantaneous and intermittent repeated charging and discharging method is adopted for the self-discharge and unqualified batteries to melt down burrs and dendrites which can bring the augmentation of self-discharge inside the battery and generate marginal discharge. The burrs and the dendrites are arranged at the surface of an electrode or inside a septum. Because a great deal of electrolyte is reserved inside the electrode and the septum, the melting of the burrs and the dendrites can not bring the further perforation of the septum which can increase the self-discharge of the battery, so the charge retention ability and the reserving performance of the battery can be improved. The self-discharge and unqualified batteries in the production can be repaired and processed through the method of the invention, and the qualified rate of renewed detection can reach over 80 percent.

Description

technical field [0001] The invention relates to a method for repairing unqualified self-discharging batteries. Background technique [0002] In the battery production process, especially for batteries such as MH-Ni, Cd-Ni, and Zn-Ni with thinner plates, tiny burrs will inevitably appear on the edges and corners of the electrodes, and these burrs can easily penetrate the separator. , causing a micro-short circuit of the battery, thereby increasing the self-discharge of the battery and affecting the normal application of the battery. During battery storage, due to the dissolution and deposition of electrode materials, dendrites, such as Cd dendrites, Co dendrites, Zn dendrites, etc., are formed on the electrode surface. The discharge increases and the storage performance decreases. [0003] There are many related literatures on the method of reducing battery self-discharge, such as "Power Supply Technology" journal 1995, 19 (6), pages 1-3, "Electrolyte Composition vs. MH" pu...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M10/42H01M6/52H01M6/50H01M10/44
CPCY02E60/12Y02E60/10Y02W30/84
Inventor 李相哲邢志勇荣蓉黄继成陆勇黄伟东
Owner CHUNLAN GROUP CORP
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