Manufacturing method of lithium-ion batteries

A manufacturing method and technology for lithium electronic batteries, which are applied in the manufacture of electrolyte batteries, secondary batteries, and final products, etc., can solve the problems of large capacity dispersion of single cells, low utilization rate of single cells, and reliability of battery packs. Reduce and other problems, to achieve the effect of reducing capacity dispersion and range, manufacturing method is simple and easy to operate, and improving consistency

Active Publication Date: 2018-01-09
SHANDONG SACRED SUN POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, in the process of battery assembly, the capacity of single cells has large dispersion and poor capacity consistency, and the utilization rate of single cells is low, resulting in a decrease in the reliability of the battery pack.

Method used

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  • Manufacturing method of lithium-ion batteries
  • Manufacturing method of lithium-ion batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Taking the production of a 60Ah lithium-ion battery with two single cells as an example, the single cells include 24 positive electrodes and 25 negative electrodes.

[0053] 1) Determine the weight range of the positive electrode sheet described in the positive electrode sheet. Among them, the positive electrode sheet with a weight range of 5.11g to 5.40g is divided into three grades: high, medium and low, and the weight range of each grade is 0.1g. as follows:

[0054] grade name

[0055] 2) Determine the weight range of the negative electrode sheet described in the negative electrode sheet. Among them, the negative electrode sheet with a weight range of 3.01g to 3.30g is divided into three grades: high, medium and low, and the weight range of each grade is 0.1g. as follows:

[0056] grade name

[0057] 3) The positive and negative electrodes are preferentially matched into a group according to the principle of matching the same grade. Each group c...

Embodiment 2

[0063] Taking the production of a 150Ah lithium-ion battery with 5 single cells as an example, the single cells include 24 positive electrodes and 25 negative electrodes.

[0064] 1) Determine the weight range of the positive electrode sheet described in the positive electrode sheet. Among them, the positive electrode sheet with a weight range of 5.11 to 5.40 is divided into three grades: high, medium and low. The weight range of each grade is 0.1g as the standard, and the grades are as follows:

[0065] grade name

[0066] 2) Determine the weight range of the negative electrode sheet described in the negative electrode sheet. Among them, the negative electrode sheet with a weight range of 3.01 to 3.30 is divided into three grades: high, medium and low. The weight range of each grade is 0.1g as the standard, and the grades are as follows:

[0067] grade name

[0068] 3) The positive and negative electrodes are preferentially matched into a group according to...

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Abstract

The invention discloses a manufacturing method of lithium-ion batteries. The method comprises the following steps: determining positive pole piece weight gears which positive pole pieces belong to, wherein the positive pole piece weight gears are divided into 1 to N gears from light to heavy; matching the positive pole pieces with negative pole pieces according to preset pole piece matching rules;making a diaphragm and the every two paired positive and negative pole pieces into a single battery cell, wherein the positive pole piece belonging to the Mth positive pole piece weight gear correspondingly forms to the Mth-gear single cell at the same gear; determining the number of the single battery cells, which are needed to be in parallel connection with the batteries, according to the battery capacity; when the N gear is an even number gear, pairing the Ath-gear single battery cell with the N+1-Ath-gear single battery cell for matching a battery team, wherein A is greater than or equalto 1 and less than or equal to N, A is a positive integer, and A is less than (N+1-A); when the N gear is an odd number gear, pairing the Bth-gear single battery cell with the N+1-Bth-gear single battery cell for matching the battery team, wherein B is greater than or equal to 1 and less than or equal to N, B is a positive integer, and B is less than (N+1-B); singly using the (N+1)/2th-gear singlebattery cell for matching the battery team. The method can greatly improve the consistency of capacities of single batteries.

Description

technical field [0001] The invention relates to the technical field of lithium electronic batteries, in particular to a manufacturing method of lithium electronic batteries. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, long cycle life, good safety performance, no memory effect, environmental protection and no pollution. These fields also show impressive development prospects. [0003] In the field of energy storage and batteries for electric vehicles, a large number of individual small-capacity lithium batteries need to be connected in series and parallel to meet the power requirements of large capacity and high voltage. The capacity consistency of the battery pack depends on the consistency of the capacity of the single battery. Among them, a lithium-ion battery usually includes a casing, two or more parallel-connected single cells, the positive tabs of all single cells are riveted on the positive pole conn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCY02E60/10Y02P70/50
Inventor 魏翠王志军马建平
Owner SHANDONG SACRED SUN POWER SOURCES
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