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Laminated pole-piece lithium-ion battery

A lithium-ion battery and pole piece technology, applied in secondary batteries, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of lithium battery zero electricity, scrapping, high zero electricity in batches, etc., and reduce the cost of battery zero electricity The effect of chance

Active Publication Date: 2014-06-04
SHENZHEN GREPOW BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the prior art, since the laminated lithium-ion battery is multi-body internal parallel connection, as long as one separator penetrates and a pole piece short circuit occurs, the lithium battery will be completely scrapped due to zero power, resulting in zero power in batches. higher chance

Method used

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  • Laminated pole-piece lithium-ion battery
  • Laminated pole-piece lithium-ion battery
  • Laminated pole-piece lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] figure 2 It is a schematic front view structure diagram of a pole piece for a laminated lithium-ion battery provided in this embodiment. The pole piece can be a positive pole piece or a negative pole piece. see figure 2 As shown, the shape of the pole piece of the present embodiment is specifically as follows:

[0057] A lug welding protruding portion 201 is arranged on the top of the pole piece, and on the pole piece, the outer edge corner portion closest to the lug welding protruding portion 201 is a circular arc transition portion 202, and the circular arc transition portion 202 It is tangent to the extension line of the top transverse edge 204 of the pole piece, and the arc transition portion 202 is also tangent to the longitudinal edge 203 of the pole piece.

[0058] In application, the radius of the arc transition portion 202 can be set to at least 0.5 mm according to actual application requirements. Make the arc transition part 202 have a larger radius (tha...

Embodiment 2

[0065] image 3 Schematic diagram of the structure of a laminated lithium-ion battery provided in this embodiment (the positive electrode sheet 300 is located at the forefront);

[0066] Figure 4 A schematic diagram of the top view structure of a laminated lithium-ion battery provided in this embodiment ( Figure 4 The middle part 000 of the laminated battery is omitted);

[0067] Figure 5 A left view structural schematic diagram of a laminated lithium-ion battery provided in this embodiment ( Figure 5 The middle part 000 of the laminated battery is omitted).

[0068] see Figure 3-5 As shown, the laminated lithium-ion battery of this embodiment includes a stacked positive electrode sheet 300 , a separator 303 , and a negative electrode sheet 400 .

[0069] The positive electrode sheet 300 , negative electrode sheet 400 and separator 303 cut into small pieces are stacked together. During stacking, each positive electrode sheet 300 and negative electrode sheet 400 are...

Embodiment 3

[0088] Figure 9 A schematic diagram of the rear view of a stacked lithium-ion battery provided in this embodiment (the stack at the rearmost end of the stacked lithium-ion battery is the negative electrode sheet 901),

[0089] Figure 10 A schematic diagram of the front view of a stacked lithium-ion battery provided in this embodiment (the stack at the front end of the stacked lithium-ion battery is the positive electrode sheet 1001),

[0090] Figure 11 It is a schematic plan view of a laminated lithium-ion battery provided in this embodiment, and the middle part 000 of the laminated battery is omitted.

[0091] Figure 12 It is a left-view structural schematic diagram of a stacked lithium-ion battery provided in this embodiment, and the middle part 000 of the stacked battery is omitted.

[0092] see Figure 9-12 Shown, this embodiment is the combination of embodiment 1,2, namely in this embodiment:

[0093] On all the small pieces of negative electrode sheet 901, the ...

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Abstract

The invention relates to the field of lithium-ion batteries, and discloses a laminated pole-piece lithium-ion battery. The laminated pole-piece lithium-ion battery comprises positive pole pieces, diaphragms, negative pole pieces, positive lugs and negative lugs arranged in a pile. The diaphragm is arranged between the positive pole piece and the negative pole piece. Each one of the positive pole pieces and the negative pole pieces is provided with a lug welding protrusion. Each one of the positive lugs and the negative lugs are welded on the corresponding lug welding protrusion. On the positive pole pieces and the negative pole pieces, corners of outer edges of the lug welding protrusion closest to the corresponding positive pole pieces and the negative pole pieces are circular arc transition parts. The circular arc transition parts are tangent to top traverse edges and longitudinal edges of the positive pole pieces. The top traverse edges are located at bottoms of the lug welding protrusions. Peaks of the circular arc transition parts are at least 3 millimeters lower than the diaphragms. The peak of the circular arc transition part is an intersection point of the circular arc transition part and a straight line between the centre of the circular arc transition part and an intersection point of the top traverse edge and a longitudinal edge extension line. The laminated pole-piece lithium-ion battery is beneficial for reducing probability of zero current scrap caused by internal short-circuiting of a laminated lithium-ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to pole pieces and laminated lithium ion batteries. Background technique [0002] Lithium-ion batteries are mainly divided into wound lithium-ion batteries and laminated lithium-ion batteries according to the manufacturing process of the batteries. The lamination process of laminated lithium-ion batteries is mainly: cutting the positive and negative electrodes into multiple small pieces, and then stacking these positive and negative electrodes with the separator, so that the separator can be spaced between the positive and negative electrodes. [0003] The lamination manufacturing processes in the prior art mainly include three types: bag-making, z-shaped, and winding-type laminations. Among them, the bag-making lamination is generally packaged in a bag made of a diaphragm for the positive electrode, and the negative electrode is sequentially sealed. stack. The z-shaped lamina...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0585H01M4/13
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 何安轩胡远升张继锋张艳萍
Owner SHENZHEN GREPOW BATTERY CO LTD