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Formation method of aqueous power battery

A technology of power battery and formation method, which is applied in the direction of secondary battery, electrochemical generator, and secondary battery repair/maintenance, etc., can solve the problems of difficult uniform distribution of electrolyte, short battery life in the later period, and spinning on the top of the battery. , to solve the difference of battery consistency, close battery performance, and convenient production and operation.

Active Publication Date: 2020-09-25
包头昊明稀土新电源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water-based power batteries use water-based electrolyte, which is usually added in an air atmosphere. The existing chemical formation processes have problems of poor battery consistency and difficult sorting. The root cause is that water-based batteries use a large amount of water-absorbing diaphragm materials. Negative electrode sheets alternately form batteries, which have a certain degree of tightness after being inserted into the battery shell. The added electrolyte is difficult to distribute evenly, and some parts are dry, and even the electrolyte is still spun on the top of the battery. In this case, high temperature or formation, There is already a difference in the consistency of the battery, and the follow-up depends on charging and discharging several times, and uniform discharge to a certain voltage value to narrow the difference, but it cannot be fundamentally improved; Battery formation process, but there is a vacuum negative pressure to absorb liquid, and there is a lack of surplus electrolyte, which causes the problem of short life of the battery in the later period
[0004] How to achieve effective formation and make the battery achieve high efficiency and consistency is a difficult point in technology and research with great industrial value, but the current reports are limited to the above three solutions, and the above problems have not been solved

Method used

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  • Formation method of aqueous power battery

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Experimental program
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Effect test

Embodiment 1

[0031] A method for forming an aqueous power battery, comprising the following steps:

[0032] (1) Fill the 5Ah water-based power battery with 20g of electrolyte solution and seal it. After leaving it at a high temperature of 40°C for 6 hours, charge and discharge twice with a small current of 0.05C. The first charge and discharge time is 2 hours (the charge is equivalent to 10%), the second time is 8h (the charge is equivalent to 40%).

[0033] (2) Shelve at a low temperature of 10±5°C for 1 day, check the voltage with a multimeter, and distinguish short-circuited batteries from non-short-circuited batteries, so as to remove short-circuited batteries, and the batteries with normal voltage enter the next step;

[0034] (3) Add 1g of electrolyte uniformly, and charge and discharge three times with a small current of 0.2C again. 40%), the third charge and discharge time is 5h (the charge is equivalent to 100%).

[0035] (4) According to the six concordances of consistent capac...

Embodiment 2

[0060] A method for forming an aqueous power battery, comprising the following steps:

[0061] (1) Inject 400g of electrolyte into a 200Ah water-based battery and seal it. After standing at a high temperature of 45°C for 24 hours, charge and discharge twice with a small current of 0.2C. The first time is 1 hour (the charge is equivalent to 20%), and the second time The second time is 2h (the charge is equivalent to 40%).

[0062] (2) Shelve it at a low temperature of 25±5°C for 360 days, detect the voltage with a multimeter, and distinguish between short-circuited and non-short-circuited batteries, so as to remove the short-circuited batteries and enter the next step for batteries with normal voltage;

[0063] (3) Add 40g of electrolyte in a unified manner, and charge and discharge at a low current of 0.05C three times again. The first time is 4h (the charge amount is equivalent to 20%), the second time is 7h (the charge amount is equivalent to 40%), and the third time is 12h...

Embodiment 3

[0067] A method for forming an aqueous power battery, comprising the following steps:

[0068] (1) Inject 300g of electrolyte into a 100Ah water-based battery and seal it. After leaving it at 42°C for 12 hours, charge and discharge it twice with a small current of 0.1C. The first time is 1.5h (the charge is equivalent to 15%). The second time is 8h (the charge is equivalent to 80%).

[0069] (2) Shelve at a low temperature of 15±5°C for 90 days, check the voltage with a multimeter, and distinguish short-circuited batteries from non-short-circuited batteries, so as to remove short-circuited batteries and enter the next step for batteries with normal voltage;

[0070] (3) Add 10g of electrolyte in a unified manner, and charge and discharge at a low current of 0.05C for three times. The first time is 4h (the charge is equivalent to 20%), the second is 8h (the charge is equivalent to 40%), and the third is 14h (the charge is equivalent to 70%);

[0071] (4) According to the six ...

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Abstract

The invention belongs to the technical field of power battery manufacturing, and relates to a formation method of an aqueous power battery. The method comprises: injecting electrolyte into the aqueouspower battery, sealing, standing at the high temperature of 35-50 DEG C for a certain period of time, and charging and discharging twice by adopting low current; standing for a certain time at a lowtemperature of 5-30 DEG C, and then sorting and grading; supplementing 1-2g of electrolyte every 10Ah to supplement and increase the electrolyte, and then carrying out low-current charging and discharging for three times; and carrying out combined delivery according to six consistencies of consistent capacity, internal resistance-caused, voltage-caused and constant current ratio, consistent discharge platform and initial charged quantity-caused. According to the method, the battery sorting period and the battery sorting grade can be shortened, secondary liquid adding is introduced, secondary formation and sorting are achieved, effective formation is achieved, the formed batteries can be directly used for battery pack production, the battery performance of each battery pack is close, the service life of the battery pack is longer, the performance is more stable, operation is convenient, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of power battery manufacturing, and relates to a formation method of a water system power battery. Background technique [0002] Aqueous power batteries have the advantages of high safety, long life, and wide ambient temperature range (-55°C to 60°C), and have been widely used. With the rapid increase in the number of new energy vehicles and the outbreak of the new energy 5G base station market, water-based batteries for vehicles and base stations have also shown explosive growth, and water-based power batteries need to be grouped before they can be applied. The first step in group consistency is formation , The formation is related to the reliability of product quality and the brand of enterprise products. How to realize the effective formation of water-based power batteries has become a realistic research topic and an urgent industrial problem to be solved. [0003] Currently, there are three methods of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44
CPCH01M10/446Y02E60/10Y02P70/50
Inventor 蒋志军李建刚尹路军熊玮李志锦颜鲁敏石志明李伟陈红艳
Owner 包头昊明稀土新电源科技有限公司