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Battery pole piece and battery including same

A battery pole piece, battery technology, applied in secondary batteries, active material electrodes, circuits, etc., can solve the problem of battery capacity, life, high-rate discharge performance and safety performance reduction, non-uniform electron current carrying capacity, and falling off area. Large and other problems, to achieve the effect of being conducive to high current charging and discharging, not easy to side reactions, and easy to infiltrate

Active Publication Date: 2013-01-30
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the non-uniform electron carrying capacity carried on the pole piece of the existing battery when charging and discharging, the impedance on the pole piece is relatively large, and the heating is uneven, and the active material with high calorific value fails and the area of ​​the shedding part is relatively large , which leads to the disadvantages of reduced battery capacity, life, high-rate discharge performance and safety performance, and provides a battery with uniform electron carrying capacity, small impedance, small heat generation area, and strong wettability when the battery is charged and discharged. battery pole piece

Method used

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  • Battery pole piece and battery including same
  • Battery pole piece and battery including same
  • Battery pole piece and battery including same

Examples

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preparation example Construction

[0038] In the preparation method of the battery, except that the pole core is prepared according to the method provided by the present invention, other steps are well known to those skilled in the art.

[0039] A further description will be given below for each pole piece of the laminated type according to the present invention in conjunction with the accompanying drawings.

[0040] as attached figure 1 It is a schematic structural diagram of each pole piece of a conventional laminated battery, and tabs 2 are led out from both ends of each pole piece 4 .

[0041] as attached figure 2 , attached image 3 It is a structural schematic diagram of two preferred embodiments of the present invention. The battery pole core of the present invention is a laminated pole core, and each pole piece 4 of the pole core includes a current collection part 2 and a plurality of mutually spaced The small pole pieces 1, the small pole pieces 1 are connected to each other through the current col...

Embodiment 1

[0044] (1) Preparation of positive electrode sheet

[0045] The cathode active material LiCoO 2 , conductive agent acetylene black, and binder PVDF according to the ratio of 9:1:1, add an appropriate amount of NMP and mix uniformly to form a slurry, and then evenly coat it on an aluminum foil with a thickness of 0.02 mm, dry and press Slice, cut. The total length of each pole piece is 118.5 to 123 mm, the width is 55 mm, and the thickness is 0.130 mm. Scrape off the material of the pole piece with some tabs to obtain a current collector with a length of 15 mm and a width of 5 mm. The main body of the pole piece dressing is cut into 10 small pole pieces, the length of the small pole piece is 25 mm, the width is 9 mm, and the interval between the small pieces is 0.3 to 1 mm. The whole pole piece is as follows: figure 2 shown. Fold the pole piece in half in the direction of diaphragm extension and seal it by welding. The diaphragm at both ends of the spot-welded lug is left u...

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Abstract

The invention provides a battery pole piece, comprising at least one current collecting part and a plurality of spaced small pole pieces connected with the current collecting part; the small pole pieces are mutually communicated through the current collecting part. The pole piece of the invention has uniform electronic carrying flow, small impedance, smaller size of the position with high heatingquantity and strong infiltrative while the battery charges and discharges. Meanwhile, the battery including the battery pole piece of the invention has higher capacitance, longer service life, good high-fold discharging performance and high safety performance. The invention is simple and convenient to be realized.

Description

【Technical field】 [0001] The invention relates to a battery pole piece and a battery containing the pole piece. 【Background technique】 [0002] As a high specific energy chemical power source, batteries have been widely used in mobile communications, notebook computers, video cameras, cameras, portable instruments and other fields. People have higher and higher requirements on the performance of secondary batteries. [0003] The pole core of the battery will generate heat during the charging and discharging process, which will easily cause the material of the battery pole piece to drop, which will greatly affect the performance of the battery, and it is a problem waiting to be solved now. [0004] Existing high-power charge-discharge batteries adopt the method of multiple tabs at both ends of the pole piece to disperse part of the heat. Calculated from the electron current carrying capacity, when this battery is charging and discharging, electrons enter and flow from both e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M10/36H01M10/40
CPCY02E60/12Y02E60/10
Inventor 邓奇思袁学远
Owner BYD CO LTD
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