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A kind of manufacturing method of lithium ion battery

A manufacturing method and technology of lithium electronic batteries, which are applied in the manufacture of electrolyte batteries, secondary batteries, and final product manufacturing, can solve the problems of large capacity dispersion of single cells, low utilization rate of single cells, and reliability of battery packs. reduce the problems such as reducing capacity dispersion and extreme difference, the manufacturing method is simple and easy to operate, and the effect of improving consistency

Active Publication Date: 2019-12-20
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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  • A kind of manufacturing method of lithium ion battery
  • A kind of manufacturing method of lithium ion battery

Examples

Experimental program
Comparison scheme
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 A1 A2 A3 Gear range / g 5.11～5.20 5.21～5.30 5.31～5.40

[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 B1 B2 B3 Gear range / g 3.01～3.10 3.11～3.20 3.21～3.30

[0057] 3) The posi...

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 A1 A2 A3 Gear range / g 5.11～5.20 5.21～5.30 5.31～5.40

[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 B1 B2 B3 Gear range / g 3....

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Abstract

The invention discloses a method for manufacturing a lithium electronic battery, which includes: determining the weight range of the positive electrode sheet to which the positive electrode sheet belongs, which is divided into 1 to N grades from light to heavy; matching the positive electrode sheet and the negative electrode sheet according to the preset electrode sheet matching rules; The diaphragm and the paired positive and negative electrodes are made into a single battery cell, and the positive electrode sheet belonging to the Mth positive electrode weight level corresponds to the Mth level single cell of the same gear; according to the battery capacity requirement, it is determined that the batteries need to be connected in parallel. The number of battery cells. When the N file is an even file, the A file cell and the N+1-A file cell are paired for matching, 1≤A≤N, A is Positive integer, and A<(N+1‑A); when the N range is an odd number, the single cells of the B range and the N+1‑B range single cells are paired for grouping, 1≤B≤N, B is a positive integer, B<(N+1‑B), the (N+1) / 2nd single cell is used for grouping alone. This method can greatly improve the consistency of the capacity of the single battery.

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 Patents(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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