A kind of super-capacity single battery injection and formation method

A technology of single battery and formation method, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of local capacity decay, poor contact of pole groups, and large number of internal parallel pole groups, etc. The uniformity, the inhibition of loose contact and the effect of saving the injection time

Active Publication Date: 2022-07-26
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main difficulties that limit the further improvement of battery capacity are: due to the large size of the battery, it is difficult to inject liquid in a vacuum; the number of parallel electrode groups is large, and the electrolyte infiltration uniformity in each electrode group and between the electrode groups is poor after liquid injection; The contact between them is not tight, the tiny bubbles are difficult to discharge, the state of the electrode interface is poorly formed, and the consistency between the electrode groups is poor
These factors all lead to too fast local capacity decay, which seriously affects the cycle life of the battery.

Method used

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  • A kind of super-capacity single battery injection and formation method
  • A kind of super-capacity single battery injection and formation method
  • A kind of super-capacity single battery injection and formation method

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0050] 1. Preparation of positive and negative electrode sheets

[0051] Preparation of positive and negative electrode sheets for lithium ion batteries, the specific manufacturing method is currently known in the technical field, and will not be described here;

[0052] 2. Battery molding

[0053] The positive electrode sheets, separators, and negative electrode sheets made above are assembled into a certain number of pole groups by lamination or winding. After the pole groups are vacuum-dried, the pole groups are connected to one or more confluences through internal parallel connection. The structure is connected with the positive and negative poles to realize the function of exporting the current to the outside, and complete the battery assembly, the shell and the battery cover welding;

[0054] 3. Tooling installation

[0055] Under the environmental condition of dew point temperature of -30℃~-50℃, connect the multi-parallel comb-shaped liquid injection and sealing tool ...

Embodiment 1

[0077] Taking the 500Ah lithium iron phosphate system ultra-large single battery as an example, the battery preparation, liquid injection and chemical formation are carried out by referring to the following steps.

[0078] Step 1: Preparation of positive and negative electrode sheets

[0079] Prepare the positive and negative electrode sheets of the ultra-large-capacity lithium-ion single battery according to the existing known methods;

[0080] Step 2: Battery Molding

[0081] By means of lamination, the positive electrode and the negative electrode are separated by a diaphragm, and assembled into 10 50Ah small-capacity electrode groups to realize the electrode composition type; for 5 groups. The positive pole of each group is connected to the bottom of a positive pole, and the negative pole of each pole group is connected to the bottom of a negative pole. The super-capacity single battery contains a total of five positive poles and five negative poles to realize the functi...

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Abstract

The invention discloses a liquid injection and chemical formation method for a super-capacity single battery, which belongs to the technical field of chemical battery manufacturing. Step 2: Liquid injection and soaking; Step 3: Pre-sealing; Step 4: Primary aging; Step 5: Pre-charging; Step 6: Step vacuum treatment after pre-charging; Step 7: Secondary aging; Step 8: Pre-aging ; Step 9: step-type vacuum treatment after preformation; step 10: formation; step 11: step-type vacuum treatment after formation; step 12: liquid replenishment and sealing. The adoption of the above technical solution, that is, the liquid injection and formation method of the ultra-large-capacity single-cell battery, can effectively improve the consistency of the interface between the ultra-large-capacity single-cell battery electrode groups and effectively improve the battery cycle life.

Description

technical field [0001] The invention belongs to the technical field of chemical battery manufacturing, and in particular relates to a liquid injection and chemical formation method for a super-capacity single battery. Background technique [0002] Compared with batteries of nickel-cadmium and lead-acid systems, lithium-ion batteries have the advantages of high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. Currently, they are mainly used in power and energy storage. and consumer sectors. [0003] With the continuous expansion of the use of lithium-ion batteries, they are widely used in the field of vehicle and marine power. The increasing demand for battery life of power batteries and the continuous increase in energy output capacity of energy storage batteries require that lithium-ion batteries should have higher capacity performance, that is, have good energy density. The traditional pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/609H01M50/636H01M50/60
CPCY02E60/10
Inventor 蒋宁懿刘兴江韩立明毛国龙
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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