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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 deal with these batteries so that their self-discharge or charge retention capabilities meet the requirements, there are no relevant documents or patents. introduce

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Optionally, 10 batteries with unqualified self-discharge in production shall be tested.

[0014] When the state of charge is 0, charge the battery to 120% with a current of 0.2C, put it aside for 1h, and discharge it at 0.2C to a termination voltage of 1.0V, and calculate the actual capacity of the battery.

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

[0016] For 10 batteries, when the state of charge is 0, the impact test is carried out with a current of 180A. The impact system is charging for 2s, resting for 5s, and continuous cycle 5 times. After the impact, discharge the battery with a current of 0.2C to a cut-off voltage of 1.0V. Then charge the battery to 120% with a current of 0.2C, leave the b...

Embodiment 2

[0021] The batteries with unqualified self-discharge in the production batch of batteries shall be subjected to impact treatment according to the above system. After the treatment, the battery was re-tested, and more than 80% of the batteries passed the self-discharge test. An anatomical analysis is performed on batteries that are still partially self-discharged. The main reason is that there is a large short-circuit source inside the battery, or there are obviously burnt holes in the separator, which cannot be repaired.

[0022] After the battery repaired by the method, all the performance indexes of the test meet the standard requirements, the qualified rate of battery production is improved, and the cost of the battery is relatively reduced.

[0023] Since MH-Ni, Cd-Ni, Zn-Ni and other batteries all use thinner plates, burrs and other phenomena will inevitably appear in the battery production process, and there are also Co dendrites and Cd dendrites in the long-term storag...

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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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