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Battery electrolyte filling method

A battery and liquid injection technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problem of low liquid injection volume, and achieve the effects of high discharge capacity, improved cycle performance, and increased injection volume

Inactive Publication Date: 2008-07-02
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect of low liquid injection volume in the battery liquid injection process in the prior art, and provide a method that can increase the liquid injection volume of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This example is used to prepare a battery without electrolyte.

[0022] (1) Preparation of positive electrode

[0023] 100 g of the positive active ingredient LiCoO 2 , 3 grams of polyvinylidene fluoride and 4 grams of conductive agent acetylene black were added to 50 grams of N-methyl-2-pyrrolidone, and then stirred in a mixer to form a uniform positive electrode slurry.

[0024] The slurry was evenly coated on aluminum foil, then dried at 150°C, rolled, and cut to obtain a positive electrode sheet with a size of 400×43.5 mm, which contained 5.8 grams of active ingredient LiCoO 2 .

[0025] (2) Preparation of negative electrode

[0026] 100 grams of graphite, 3.5 grams of polytetrafluoroethylene, 0.5 grams of sodium carboxymethylcellulose, and 4 grams of conductive agent acetylene black were added to 120 grams of water, and then stirred in a mixer to form a uniform negative electrode slurry.

[0027] The slurry is evenly coated on the copper foil, then dried at 90°...

Embodiment 2

[0031] This example illustrates the injection method of the electrolyte solution of the battery provided by the present invention.

[0032] The electrolyte lithium salt LiPF 6 It is dissolved in a non-aqueous solvent at a concentration of 1 mole / liter to form a non-aqueous electrolyte, and the non-aqueous solvent is a mixed solvent of ethylene carbonate and dimethyl carbonate with a volume ratio of 1:1. Use a vacuum liquid injection machine (produced by Guangzhou Lange Electric Equipment Co., Ltd., model LDZ-20) to the battery W without electrolyte obtained in Example 1 (the battery W was weighed before the liquid injection, and the weight was 14.65 grams. ) for vacuum liquid injection, first use the vacuum liquid injection machine to evacuate the battery until the pressure in the battery case is 500-1000 Pa, then inject 3.0 grams of the above-mentioned electrolyte solution, and wipe off the leaked electrolyte solution. The battery was weighed, and the weight was 17.25 grams,...

Embodiment 3

[0038] This example illustrates the injection method of the electrolyte solution of the battery provided by the present invention.

[0039] The electrolyte lithium salt LiPF 6 It is dissolved in a non-aqueous solvent at a concentration of 1 mole / liter to form a non-aqueous electrolyte, and the non-aqueous solvent is a mixed solvent of ethylene carbonate and dimethyl carbonate with a volume ratio of 1:1. Use a vacuum liquid injection machine to carry out vacuum liquid injection to the battery W without electrolyte obtained in Example 1 (the battery W is weighed before the liquid injection, and the weight is 14.64 grams). The battery is evacuated until the pressure inside the battery shell is 10-500 Pa, and then 2.3 grams of the electrolyte prepared above is injected into the battery without leakage. The battery is weighed, and the weight is 16.94 grams, and sealed with adhesive tape. The battery was then placed in a centrifuge and centrifuged at a speed of 1500 rpm for 8 minut...

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Abstract

The invention relates to a method for electrolyte-injecting a battery, which comprises the steps that: a battery shell is vacuumized; then non-aqueous electrolyte is injected into the battery shell by a filling machine; after a first electrolyte-injection is finished, the electrolyte content of the first electrolyte-injection is above 60 percent of the total weight of the electrolyte injected; the battery shell is sealed to carry out centrifugal sinking; then the seal is taken to vacuumize; a second electrolyte-injection is carried out; the electrolyte content of the second electrolyte-injection is the content which injects the battery shell full. By using the method of the second electrolyte injection, the invention largely enhances the electrolyte injection volume, which enhances by 15 percent-25 percent of the electrolyte injection volume compared with the prior art.

Description

technical field [0001] The invention relates to a liquid injection method for a battery, in particular to a liquid injection method for a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of small size, high energy, and no pollution, and have been more and more widely used in portable electronic products such as mobile phones and digital cameras. Nowadays, people's requirements for lithium-ion batteries are getting higher and higher, and many battery manufacturers are also striving to develop lithium-ion battery products with higher capacity, smaller volume and better performance. [0003] A lithium-ion battery generally includes a battery casing, a pole core and a non-aqueous electrolyte contained in the battery casing, and the pole core includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode. The preparation method of this type of battery generally includes ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/36H01M50/609H01M50/618
CPCY02E60/10
Inventor 王凯
Owner SHANGHAI BYD
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