CN219144257U

CN219144257U - Soft package lithium ion battery cell formation pressurizing structure

Info

Publication number: CN219144257U
Application number: CN202223188803.3U
Authority: CN
Inventors: 肖艳; 王涛; 何浩; 耿铁成; 郑庆华
Original assignee: Sichuan Changhong Battery Co ltd
Current assignee: Sichuan Changhong Battery Co ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-06-06
Anticipated expiration: 2032-11-30

Abstract

The utility model discloses a soft package lithium ion battery cell formation pressurizing structure, which comprises a plurality of pressurizing clamping plates which are mutually spaced and are arranged in a plurality of rows in parallel, wherein battery cells are arranged in gaps between adjacent pressurizing clamping plates; the auxiliary supporting block is arranged in a gap between adjacent pressurizing clamping plates, and no battery cell is arranged in the gap; the two side surfaces of the auxiliary supporting block, which are contacted with the pressurizing clamping plate, are elastic surfaces. Through setting up a plurality of pressurization splint and regard as the pressurized atress transfer structure to provide even pressure for the electric core in the formation work, to the electric core of different size specifications, the clearance that accessible increases between the pressurization splint carries out size compensation to between the pressurization splint, supports the pressurization splint simultaneously to prevent that the pressurization splint from taking place to warp and causing electric core surface atress inhomogeneous after the atress.

Description

Soft package lithium ion battery cell formation pressurizing structure

Technical Field

The utility model relates to the technical field of battery production, in particular to a soft package lithium ion battery cell formation pressurizing structure.

Background

The formation process of the soft package lithium ion battery core is one of important processes in the production of the storage battery, and the soft package lithium ion battery core needs to apply pressure to the surface of the battery core through external equipment when in formation so as to discharge gas generated in the primary charging process into the air bag, so that a uniform solid electrolyte membrane, SEI film for short, can be generated on the surface of the electrode.

At present, when the soft package lithium ion battery cell is subjected to formation work in the industry, a pressurizing structure and formation equipment with specific specifications are adopted, if the battery cell is placed on the unmatched pressurizing formation equipment for formation, the pressurizing structure is unevenly stressed and deformed, so that the battery cell is unevenly stressed during formation, the battery cell is not beneficial to forming an even SEI film in the first discharge process, and finally, the performance of the battery cell is deteriorated. Therefore, when the battery manufacturers produce the battery cell models with different sizes, the formation equipment with matched sizes must be purchased in a targeted manner, so that the production cost is increased and the resource is wasted.

Disclosure of Invention

The technical problems to be solved by the utility model are as follows: the soft package lithium ion battery cell formation pressurizing structure with even stress on the battery cell is suitable for pressurizing battery cells with different sizes.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the soft package lithium ion battery core is formed into a pressurizing structure, which comprises a plurality of pressurizing clamping plates which are mutually spaced and are arranged in a plurality of rows in parallel, and battery cores are arranged in gaps between adjacent pressurizing clamping plates; the auxiliary supporting block is arranged in a gap between adjacent pressurizing clamping plates, and no battery cell is arranged in the gap; the two side surfaces of the auxiliary supporting block, which are contacted with the pressurizing clamping plate, are elastic surfaces. Through setting up a plurality of pressurization splint and regard as the pressurized atress transfer structure to provide even pressure for the electric core in the formation work, to the electric core of different size specifications, the clearance that accessible increases between the pressurization splint carries out size compensation to between the pressurization splint, supports the pressurization splint simultaneously to prevent that the pressurization splint from taking place to warp and causing electric core surface atress inhomogeneous after the atress.

Further is: the auxiliary supporting block consists of a supporting part and a handle part, wherein the handle part is fixed at the top of the supporting part, and two side surfaces of the supporting part are elastic surfaces. Through setting up and carrying the hand portion and can be convenient for operating personnel to take auxiliary support piece, the supporting part is supported the pressurization splint as the position that directly contacts with the pressurization splint, and the elastic surface of supporting part both sides face can take place corresponding change along with the change of formation work in electric core thickness, makes the SEI film that electric core formed more stable.

Further is: the support part also comprises a fixed block fixed between the two elastic surfaces; the handle part is fixed on the top of the fixed block. The fixing blocks are used for providing mounting and fixing bases for the two elastic surfaces, and simultaneously providing a dimension compensation base for the auxiliary supporting block which is the most basic, and providing stable stress bases for the elastic surfaces on the two sides.

Further is: the elastic surface is made of silica gel or rubber; the fixing block is made of aluminum, iron or stainless steel. The silica gel and the rubber have good rebound resilience and adhesion, can stably deform along with the thickness change of the battery cell in the formation work, and provide good auxiliary effect for generating the SEI film for the battery cell; and the maximum reversible compression deformation rate of the elastic surface of the silica gel and the rubber is 40%, so that the deformation rate is good. Aluminum, iron and stainless steel have good strength and are not easy to deform, and the foundation component serving as the auxiliary supporting block can provide a stable supporting foundation for the auxiliary supporting block when being pressed.

Further is: the outer peripheral shape of the supporting part is a circle or a polygon.

Further is: the thickness of the fixed block in the supporting part is smaller than the thickness of the non-formed battery cell by 0.5-5.0 mm, and the thickness of the elastic surface on one side is 1.0-4.0 mm; the total thickness of the supporting part is 0.5-2.0 mm larger than the thickness of the formed battery cell.

Further is: the handle part is an arc-shaped belt fixed at the top of the supporting part, and two ends of the arc-shaped belt are fixedly connected with the top of the supporting part. Through setting up the arc area as carrying the hand portion, its simple structure, preparation are convenient, can provide good, stable hand application of force basis for the staff, the staff of being convenient for grasps.

Further is: the handle part is made of at least one of aluminum, iron, stainless steel, PET and PP.

The beneficial effects of the utility model are as follows: according to the utility model, the voltage applied to the battery cells by the formation equipment can be uniformly transmitted to different battery cells through the pressurization clamping plates by arranging the pressurization clamping plates, and meanwhile, the gaps between the pressurization clamping plates are filled by adding the auxiliary supporting blocks between the pressurization clamping plate brackets, so that the pressurization clamping plates deform due to uneven stress when being pressurized, the pressure balance of the two side surfaces of the battery cells between the pressurization clamping plates is ensured, and the formation of uniform SEI films of the battery cells is facilitated when the formation process is carried out; the utility model is suitable for the formation work of the battery cells with different sizes and specifications, can effectively reduce the investment of formation equipment and saves the production cost.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of a soft-pack lithium-ion battery cell forming pressurization structure;

fig. 2 is a schematic structural diagram of a first embodiment of a soft-pack lithium-ion battery cell formed into a compression structure;

fig. 3 is a schematic structural diagram of a third embodiment of a soft-pack lithium-ion battery cell formed into a compression structure;

FIG. 4 is a schematic view of a first embodiment of the auxiliary support block;

fig. 5 is a schematic view of a second embodiment of the auxiliary supporting block.

Marked in the figure as: 100-pressing clamping plates, 200-battery cells, 300-auxiliary supporting blocks, 310-elastic surfaces, 320-supporting parts, 330-lifting parts and 340-fixing blocks.

Detailed Description

In order to facilitate an understanding of the utility model, the utility model is further described below with reference to the accompanying drawings.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "upper", "lower", "inner", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description, and do not indicate or imply that the apparatus or components referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

As shown in fig. 1 to 3, the soft package lithium ion battery cell formation pressurizing structure disclosed in the present utility model is composed of a pressurizing clamping plate 100, a battery cell 200 and an auxiliary supporting block 300. The pressurizing clamping plates 100 are of a flat plate structure, the number of the pressurizing clamping plates 100 is set according to the number of the formed battery cells 200 required to be formed, the pressurizing clamping plates 100 are spaced from each other uniformly, the pressurizing clamping plates 100 are arranged in a plurality of rows in parallel, and the battery cells 200 required to be formed are sequentially placed in gaps between the adjacent pressurizing clamping plates 100; the formation device directly applies pressure to the pressing clamping plate 100, and then the pressing clamping plate 100 uniformly transmits the pressure to the battery cell 200. In order to ensure that the press clamping plates 100 cannot deform when the cells 200 with different sizes are pressed, the auxiliary supporting blocks 300 are additionally arranged in the gaps between the adjacent press clamping plates 100, and the cells 200 which are not arranged between the adjacent press clamping plates 100 are filled and supported by the auxiliary supporting blocks 300, so that the press clamping plates 100 are prevented from deforming due to the fact that the cells are not supported, and the cells 200 with different sizes can be uniformly stressed when being formed.

Because the battery cell 200 expands and contracts along with the charge and discharge in the formation process, the thickness of the battery cell 200 changes at the moment, so that the two side surfaces of the auxiliary supporting block 300 are set to be the elastic surfaces 310, the elastic force of the elastic surfaces 310 can enable the whole thickness of the auxiliary supporting block 300 to correspondingly change along with the change of the thickness of the battery cell 200, the gap size between the compression clamping plates 100 is further compensated in the formation process, the deformation of the compression clamping plates 100 caused by the change of the thickness of the battery cell 200 in the formation process is avoided, the stress balance of the two sides of the battery cell 200 is further ensured, and the SEI film formed inside the battery cell 200 is enabled to be more stable.

According to the actual size range of the battery cell 200 in the market and the thickness variation of the battery cell 200 in the formation process, the related size of the supporting portion 320 is adaptively limited in the present utility model, specifically, the thickness of the fixing block 340 in the supporting portion 320 is smaller than the thickness of the non-formed battery cell 200 by 0.5-5.0 mm, and the thickness of the single-sided elastic surface 310 is 1.0-4.0 mm; the total thickness of the supporting part 320 is 0.5-2.0 mm greater than the thickness of the formed battery cell 200.

As shown in fig. 4 and 5, the auxiliary supporting block 300 is composed of a supporting portion 320 and a handle portion 330, the handle portion 330 is fixed on top of the supporting portion 320, and both sides of the supporting portion 320 are elastic surfaces 310. A fixing block 340 is provided between the two elastic surfaces 310 of the supporting portion 320 to support the elastic surfaces 310, and the handle portion 330 is fixed to the top of the fixing block 340. The handle 330 is an arc-shaped belt fixed on the top of the supporting part 320, and two ends of the arc-shaped belt are fixedly connected with the top of the supporting part 320. The elastic surface 310 is made of silica gel or rubber; the fixing block 340 is made of aluminum, iron or stainless steel; the handle portion 330 is made of at least one of aluminum, iron, stainless steel, PET and PP, and the handle portion 300 and the fixing block 340 are fixedly connected by welding or injection molding according to different materials.

As shown in fig. 4 and 5, the shape of the support portion 320 is not particularly limited, and the outer circumferential shape of the support portion 320 may be a circle or a polygon.

Example 1

As shown in fig. 4, the auxiliary supporting block 300 in the soft pack lithium ion battery cell formation pressurizing structure includes a supporting portion 320 and a handle portion 330. The fixing block 340 in the supporting part 320 has a rectangular shape, and the fixing block 340 is made of stainless steel; two sides of the fixing block 340 are covered with a silica gel layer as the elastic surface 310; the handle 330 is an arc-shaped strip made of PP material, and the fixing points at two ends of the handle 330 are symmetrically arranged along the center line of the fixing block 340. The supporting portion 320 of the auxiliary supporting block 300 has a length of 110mm, a width of 100mm, a total thickness of 15mm, a thickness of the fixing block 340 of 9mm, a thickness of the one-sided elastic surface 310 of 3mm, and a reversible compression deformation rate of the elastic surface 310 of 25%.

As shown in fig. 1, the size of the battery cell 200 in the soft package lithium ion battery cell formation pressurizing structure is larger, the length of the battery cell 200 when not formed is 135mm, the width without the air bag is 115mm, and the thickness is 13.5mm. The compression splint 100 has a length of 260mm and a width of 140mm. An uncomplicated cell 200 is placed in the gap between two adjacent press jaws 100, and then an auxiliary support block 300 is placed at other positions in the same gap, the auxiliary support block 300 is not in contact with the cell 200, and the support portion 320 in the auxiliary support block 300 does not protrude beyond the top of the press jaws 100. Other non-formed cells 200 and auxiliary supporting blocks 300 are sequentially placed so that the cells 200 and the auxiliary supporting blocks 300 are respectively positioned at two ends of the pressurizing clamping plate 100.

Example 2

As shown in fig. 5, the auxiliary supporting block 300 in the soft pack lithium ion battery cell formation pressurizing structure includes a supporting portion 320 and a handle portion 330. The fixing block 340 in the supporting part 320 has a circular shape, and the fixing block 340 is made of stainless steel; two sides of the fixing block 340 are covered with a silica gel layer as the elastic surface 310; the handle 330 is an arc-shaped strip made of PP material, and the fixing points at two ends of the handle 330 are symmetrically arranged along the center line of the fixing block 340. The diameter of the supporting portion 320 in the auxiliary supporting block 300 was 120mm, the total thickness was 15mm, the thickness of the fixing block 340 was 10mm, the thickness of the one-sided elastic surface 310 was 2.5mm, and the reversible compression deformation rate of the elastic surface 310 was 30%.

As shown in fig. 2, the size of the battery cells 200 in the soft package lithium ion battery cell formation pressurizing structure is small, the number of the battery cells 200 is even, the length of the battery cells 200 when not formed is 65mm, the width without air pockets is 165mm, and the thickness is 13.5mm. The compression splint 100 has a length of 300mm and a width of 200mm. Two non-formed battery cells 200 are respectively placed at two ends of a gap between two adjacent pressing splints 100, then an auxiliary supporting block 300 is placed in the middle of the same gap, the auxiliary supporting block 300 is not contacted with the battery cells 200, and the supporting parts 320 in the auxiliary supporting block 300 do not exceed the top of the pressing splints 100. Other non-formed cells 200 and auxiliary support blocks 300 are sequentially placed such that the auxiliary support blocks 300 in the same gap are positioned between the two cells 200.

Example 3

As shown in fig. 4, the auxiliary supporting block 300 in the soft pack lithium ion battery cell formation pressurizing structure includes a supporting portion 320 and a handle portion 330. The fixing block 340 in the supporting part 320 has a rectangular shape, and the fixing block 340 is made of iron; rubber layers are covered on two sides of the fixed block 340 as elastic surfaces 310; the handle portion 330 is an arc-shaped strip made of PE material, and fixing points at two ends of the handle portion 330 are symmetrically arranged along the central line of the fixing block 340. The supporting portion 320 of the auxiliary supporting block 300 has a length of 125mm, a width of 275mm, a total thickness of 15.5mm, a thickness of the fixing block 340 of 9.8mm, a thickness of the one-sided elastic surface 310 of 2.85mm, and a reversible compression deformation rate of the elastic surface 310 of 40%.

As shown in fig. 3, the number of battery cells 200 in the soft pack lithium ion battery cell formation pressurizing structure is odd, the length of the battery cells 200 when not formed is 200mm, the width without air pockets is 275mm, and the thickness is 13.5mm. The compression splint 100 has a length of 550mm and a width of 300mm. Two non-formed cells 200 are placed in the gap between two adjacent pressing jaws 100, and then an auxiliary supporting block 300 is placed at other positions in the same gap, the auxiliary supporting block 300 is not in contact with the cells 200, and the supporting portion 320 in the auxiliary supporting block 300 does not exceed the top of the pressing jaws 100. Other non-formed cells 200 and auxiliary supporting blocks 300 are sequentially placed so that the cells 200 and the auxiliary supporting blocks 300 are respectively positioned at two ends of the pressurizing clamping plate 100. Because the number of the battery cells 200 is odd, two auxiliary supporting blocks 300 are placed in the gap where the last battery cell 200 is located for filling.

Claims

1. The soft package lithium ion electricity core becomes pressurization structure, its characterized in that: comprises a plurality of pressurizing clamping plates (100) which are mutually spaced and are arranged in a plurality of rows in parallel, and a cell (200) is arranged in a gap between every two adjacent pressurizing clamping plates (100); the device further comprises an auxiliary supporting block (300), wherein the auxiliary supporting block (300) is arranged in a gap between adjacent pressurizing clamping plates (100) and is not provided with a battery cell (200); the two side surfaces of the auxiliary supporting block (300) contacted with the pressurizing clamping plate (100) are elastic surfaces (310).

2. The soft pack lithium ion battery cell formation pressurization structure of claim 1, wherein: the auxiliary supporting block (300) consists of a supporting part (320) and a handle part (330), wherein the handle part (330) is fixed at the top of the supporting part (320), and two side surfaces of the supporting part (320) are elastic surfaces (310).

3. The soft pack lithium ion battery cell formation pressurization structure of claim 2, wherein: the support (320) further comprises a fixed block (340) fixed between the two elastic faces (310); the handle portion (330) is secured to the top of the securing block (340).

4. The soft pack lithium ion battery cell formation pressurization structure of claim 3, wherein: the elastic surface (310) is made of silica gel or rubber; the fixing block (340) is made of aluminum, iron or stainless steel.

5. The soft pack lithium ion battery cell formation pressurization structure of claim 2, wherein: the outer peripheral shape of the support part (320) is a circle or a polygon.

6. The soft pack lithium ion battery cell formation pressurization structure of claim 2, wherein: the thickness of the fixed block (340) in the supporting part (320) is 0.5-5.0 mm smaller than the thickness of the unformed battery cell (200), and the thickness of the single-side elastic surface (310) is 1.0-4.0 mm; the total thickness of the supporting part (320) is 0.5-2.0 mm greater than the thickness of the formed battery cell (200).

7. The soft pack lithium ion battery cell formation pressurization structure of claim 2, wherein: the handle part (330) is an arc-shaped belt fixed at the top of the supporting part (320), and two ends of the arc-shaped belt are fixedly connected with the top of the supporting part (320).