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Winding cell and battery

A cell and battery technology, used in non-aqueous electrolyte battery electrodes, battery electrodes, secondary batteries, etc., can solve problems such as capacity loss, positive aluminum leakage, ternary battery safety hazards, etc., to avoid safety hazards and prevent precipitation. Effect

Inactive Publication Date: 2019-10-22
REPT BATTERO ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the hot pressing process, due to the high pressure (2-10 tons), the inner ring of the winding core is squeezed the most, and the positive or negative electrodes are prone to breakage, which may lead to capacity loss or Positive aluminum leakage or negative copper leakage
Because the material will fall off after being folded in half, the negative electrode is the most serious. If the negative electrode falls off at this time, during the charging and discharging process of the battery, because there is no negative active material here, the lithium ions in the positive electrode will diffuse to the negative electrode and precipitate, especially For the ternary battery, it has a greater safety hazard
Moreover, there is no good solution to this phenomenon in the industry, but to optimize the relevant parameters in the process of winding and hot pressing to alleviate this phenomenon

Method used

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  • Winding cell and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] During the production and processing of the battery pole pieces, the tabs need to be cut, and the cut tabs need to be marked with Mark holes, so that a depression will be cut at the top of the tabs to provide for the subsequent winding process. Identification mark.

[0035] In the original winding process, a gluing device is added for gluing.

[0036] A method to improve the safety performance of winding batteries, including the positive and negative pole pieces are rolled and then passed through a slitting die-cutting machine to cut the tabs, and after the hardware or laser die-cutting machine has punched the Mark hole, pass With the added gluing device, the equipment pulls the positive and negative pole pieces to move, and glues on the corresponding position. Assume that the circumference of the winding needle is 250mm when the battery is designed, and the position of the positive electrode is C 0 30mm, negative electrode entry position A 0 It is 15mm (that is, the...

Embodiment 2

[0039] A method for improving the safety performance of wound batteries, comprising the steps of rolling the positive and negative pole pieces through a slitting die-cutting machine to cut tabs, and then performing a second slitting after the tabs are cut. A gluing device is added to the strip, the equipment pulls the positive and negative poles to move, and glues on the corresponding position, and the distance from the Mark position of the positive gluing is C 1 , C 2 , C 3 ...C 2N ; Negative electrode sheet glue is completed by negative electrode die-cutting machine, and the distance between the glue and the Mark position is A 1 , A 2 , A 3 ...A 2N , The number of laps of glue application can be controlled by manually opening or closing the glue application mechanism at regular intervals, or it can be automatically controlled by machine program to control the quantity of glue application. Through the adjustment of the device on the secondary slitting machine, you can c...

Embodiment 3

[0041] A method for improving the safety performance of winding batteries, including the positive and negative electrode pieces are rolled and then passed through a slitting die-cutting machine to cut the tabs, and the hardware or laser die-cutting machine punches the mark holes, and then cuts the tabs. Secondary split. During the loading process of the winding machine, through the gluing mechanism on the winding machine, the distance between the positive electrode gluing position and Mark is C 1 , C 2 , C 3 ...C 2N ; The distance from Mark to the position of the negative electrode sticker is A 1 , A 2 , A 3 ...A 2N , The number of laps of glue application can be controlled by manually opening or closing the glue application mechanism at regular intervals, or it can be automatically controlled by machine program to control the quantity of glue application. Through the adjustment of the device on the winding machine, you can choose to paste the positive and negative pole...

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Abstract

The invention discloses a winding cell and a battery. The winding cell comprises electrode pieces, a separator and an adhesive tape, wherein the electrode pieces comprise a positive electrode piece and a negative electrode piece; the separator is arranged between the positive electrode piece and the negative electrode piece; the adhesive tape is attached to the surface of the positive electrode piece and is attached to a corner position of the positive electrode piece; the adhesive tape can also be attached to the surface of the negative electrode piece and is attached to a corner position ofthe negative electrode piece; and one side, or, both sides, of the electrode piece is bonded with the adhesive tape. By a bonding mode, safety hazards caused by cracking occurring during the hot pressing process of the electrode piece can be effectively avoided, precipitation of metal lithium is prevented, and the safety performance of the winding cell is improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery manufacturing, in particular to a winding electric core and a battery containing the electric core. Background technique [0002] At present, winding batteries have a high degree of mechanization, high speed, and guaranteed uniformity, which is conducive to mass production and has become one of the main assembly methods for power batteries. The winding cell consists of a positive electrode sheet, a negative electrode sheet, and two separators. The separator is placed between the positive and negative electrodes, and then it is completed by a winding machine. After the battery core is wound, it needs to be hot-pressed and shaped to make the gap between the battery layers smaller and increase the flatness of the pole piece. The ternary battery mainly uses a rubber-coated separator, and the rubber particles are melted during hot pressing to shape the core. During the hot pressing process, d...

Claims

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Application Information

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IPC IPC(8): H01M10/0587H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 刘微刘婵侯敏曹辉
Owner REPT BATTERO ENERGY CO LTD
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