Pole piece for soft package button battery, button battery and preparation method thereof

A technology of button batteries and soft packs, applied in the direction of electrode carriers/collectors, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of reducing battery volume energy density, increasing cell diameter, electrolyte leakage, etc., to achieve Improve the welding method and bending method, reduce the difficulty of production, and improve the effect of safety

Pending Publication Date: 2021-03-19
HUNAN LIFANG NEW ENERGY SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The structure of the traditional soft pack button battery needs to bend the hard tab inside the cell, which has the following disadvantages: (1) Since the tab is made of thicker metals such as aluminum, nickel, copper, etc., the thickness is generally 0.06 to 0.15 mm, the thickness is relatively large, the diameter of the cell will be greatly increased after bending, and the volumetric energy density of the battery will be reduced
(2) The corner position of the hard tab after bending is very easy to pierce the outer aluminum-plastic film, causing safety problems such as electrolyte leakage and battery swelling
(3) The tab of the button battery is small, the internal resistance is large, and the rate performance is poor

Method used

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  • Pole piece for soft package button battery, button battery and preparation method thereof
  • Pole piece for soft package button battery, button battery and preparation method thereof
  • Pole piece for soft package button battery, button battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 2 As shown, a pole piece for a soft-pack button battery includes a current collector 11, an active material layer 12 and a tab 13; the current collector 11 includes a current collector body and at least one foil 111 protruding from the collector body; the active The material layer 12 is coated on the current collector main body; the tab 13 is welded to the foil 111 , one end exposed outside the pouch button battery, and at least a part of the foil 111 is reserved between the current collector main body for bending.

[0039] Wherein, at least one protruding foil material 111 can be cut out at one end of the pole piece 1 firstly, and the ways of cutting the foil material 111 include punching, roll cutting and laser cutting. When cutting a plurality of protruding foil materials 111, the gaps between adjacent foil materials 111 can be different, but it should be kept that the plurality of foil materials 111 are arranged correspondingly after the battery is w...

Embodiment 2

[0044] Such as Figure 3-8 As shown, a button battery includes an electric core 2 made of a positive electrode sheet, a separator and a negative electrode sheet, and the positive electrode sheet and / or the negative electrode sheet are the pole sheet 1 for a soft-pack button battery described in Example 1 .

[0045] Further, the tab 13 welded on the positive electrode sheet is a positive tab, and the tab 13 welded on the negative electrode sheet is a negative tab, and the positive tab and the negative tab are drawn out from the same end or both ends of the cell 2 . The specific lead-out method of the positive and negative tabs can be determined according to the direction of the foil 111 set in the positive and negative electrodes. The two lead-out methods can be respectively referred to Figure 3-5 and Figure 6-8 shown.

[0046] Further, the bent portion of the foil 111 is flattened to the end surface of the cell 2 . Because the material of the foil 111 is relatively soft,...

Embodiment 3

[0050] A preparation method for a button battery, comprising the steps of:

[0051] S1. Cut out at least one foil 111 protruding from the main body of the positive current collector on the positive current collector, and coat the positive active material layer 12 on the main body of the positive current collector to obtain a positive electrode sheet; cut out on the negative current collector At least one foil 111 protruding from the main body of the negative electrode current collector, and coating the negative electrode active material layer 12 on the negative electrode current collector 11 to obtain a negative electrode sheet;

[0052] S2. The battery cell 2 is prepared by sequentially winding the positive electrode sheet, the separator and the negative electrode sheet, and the foil material 111 of the positive electrode current collector and the foil material 111 of the negative electrode current collector are partially exposed outside the battery cell 2;

[0053] S3. Weld ...

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Abstract

The invention provides a pole piece for a soft package button battery. The pole piece comprises a current collector, an active substance layer and a tab. The current collector comprises a current collector main body and at least one foil material protruding out of the current collector main body; the active substance layer is coated on the current collector main body; the tab is welded to the foiland is exposed out of one end of the soft package button battery, and at least one part of the foil is reserved between the tab and the current collector main body for bending. Compared with the prior art, the pole piece provided by the invention has the advantages that the convex foil is arranged in the current collector to serve as the leading-out point of the tab, and a part of foil is also reserved between the tab and the current collector main body to serve as the bending area, so that the welding mode and the bending mode of the tab in the battery cell are improved; thick hard tab bending is replaced by thin foil bending, so that the thickness of the battery at the tab folding position is greatly reduced, the problems that the hard tab bending thickness is large and a soft coating film is easily punctured at the bending corner in the existing soft package button battery are solved, and the volume energy density and the safety of the battery are improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a pole piece for a soft-packed button battery, a button battery and a preparation method thereof. Background technique [0002] Due to its high self-discharge platform voltage, low self-discharge, high energy density, no memory effect, and environmental protection, lithium-ion batteries have become important power supply devices today and are widely used in various electronic devices and vehicles. With the gradual increase of portable devices, the size requirements of lithium-ion batteries are getting smaller and smaller, and button-type lithium-ion batteries are specially designed for such applications. Button battery refers to a type of small-sized lithium-ion battery that is round or quasi-circular in shape and looks like a button. It can be mainly divided into steel shell button batteries and soft-pack button batteries. Compared with steel shell button batteries, soft pack b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/70H01M50/528H01M50/538H01M10/0587H01M10/052
CPCH01M4/13H01M4/70H01M10/052H01M10/0587Y02E60/10Y02P70/50
Inventor 易欣曾涛
Owner HUNAN LIFANG NEW ENERGY SCI & TECH
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