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Method for improving matching voltage difference of lithium batteries

A lithium battery and grouping technology, which is applied to secondary batteries, secondary battery repair/maintenance, secondary battery charging/discharging, etc., can solve problems such as lithium battery pack pressure difference alarms, and achieve the effect of improving performance and experience

Pending Publication Date: 2022-08-02
SINOWATT DONGGUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for improving the differential pressure of lithium battery packs, aiming to solve the problem in the prior art that there is no solution to the differential pressure alarm of lithium battery packs by reducing the difference between the charging and discharging curves of each lithium battery in the lithium battery pack. question

Method used

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  • Method for improving matching voltage difference of lithium batteries

Examples

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Embodiment 1

[0052] A 26650 lithium battery with a designed capacity of 5000mAh. The lithium battery includes a positive electrode nickel cobalt lithium manganate ternary material, a negative electrode graphite, a lithium hexafluorophosphorus electrolyte, a diaphragm, a steel shell and other key materials. The basic principle is that the positive electrode is charged during charging. The method for improving the lithium battery matching pressure difference includes the following steps:

[0053] 1), take 8pcs lithium battery and put it on hold in a constant temperature environment of 25℃ for 30min, then charge it to 4.2V with 0.5C constant current and constant voltage according to the requirements of the product specification, and the cut-off current is 0.05C;

[0054] 2) Discharge to 2.75V according to the standard discharge current 0.2C specified in the product specification after 10min, and the discharge capacity is marked as C(0);

[0055] 3), according to step 1), recharge the lithium ...

Embodiment 2

[0063] A 18650 lithium battery with a designed capacity of 3350mAh, the lithium battery includes key materials such as positive electrode nickel cobalt aluminum material, negative electrode graphite, lithium hexafluorophosphorus electrolyte, diaphragm, steel shell, etc. During discharge, the negative electrode graphite deintercalates lithium ions and returns to the positive electrode material.

[0064] The method for improving the pressure difference of lithium battery matching group includes the following steps:

[0065] 1), take 8pcs lithium battery and put it on hold in a constant temperature environment of 25℃ for 30min, then charge it to 4.2V with 0.5C constant current and constant voltage according to the requirements of the product specification, and the cut-off current is 0.05C;

[0066] 2) Discharge to 2.5V according to the standard discharge current 0.2C specified in the product specification after 10 minutes of storage, and the discharge capacity is marked as C(0); ...

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Abstract

The invention relates to the technical field of lithium batteries, and discloses a method for improving lithium battery grouping voltage difference, which comprises the following steps: 1) charging a lithium battery to a full charge state; the discharge capacity of the first discharge stage is C (1) and the discharge voltage is Vd1, the discharge capacity of the second discharge stage is C (2) and the discharge voltage is Vd2, the discharge capacity of the Nth discharge stage is C (n) and the discharge voltage is Vdn, and the discharge capacity of the standard discharge current A is C (n + 1) in the final discharge stage; (3) the charging voltage of the first charging stage is Vc1, the charging voltage of the second charging stage is Vc2, and the charging voltage of the Nth charging stage is Vcn; 4) establishing a mathematical model of the total discharge capacity C (0) of the lithium battery; 5) calculating the discharge capacity through the mathematical model; and 6) matching the lithium batteries with the total discharge capacity of C0, the discharge voltage Vdn and the charge voltage Vcn.

Description

technical field [0001] The patent of the present invention relates to the technical field of lithium batteries, in particular, to a method for improving the pressure difference of lithium batteries. Background technique [0002] Lithium batteries are often used in multiple sets to form lithium battery packs. During the use of lithium battery packs, software alarms often occur due to excessive pressure difference between lithium battery packs, which limit the normal use of lithium battery packs or limit lithium battery packs. Effective use of group functions. [0003] At present, there are two main reasons for the pressure difference alarm of the lithium battery pack. First, the electric capacity of each lithium battery in the lithium battery pack is quite different. Due to the large difference in electric capacity, the lithium battery pack pressure difference alarm is caused; The difference in the capacity of each lithium battery in the battery pack is small, but the charge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/44H01M10/48G01R31/388
CPCH01M10/42H01M10/48H01M10/44G01R31/388Y02E60/10
Inventor 郑留群陈珠惠万里鹏邹建平罗令王立波蔡锦章曾素琼
Owner SINOWATT DONGGUAN
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