Core cladding side bracket and square shell winding battery

Abstract

The utility model relates to the technical field of shell winding batteries, in particular to a core package side support which comprises a triangular prism used for filling a gap between two adjacent core packages. Two side surfaces of the triangular prism are arc-shaped and concave inwards, and are respectively provided with an arc-shaped matching surface; the arc-shaped matching surface is used for abutting against the R-angle surface of the side part of the core cladding; the utility model provides a core package side bracket and a square shell winding battery, which are characterized in that the fitting degree of the existing side bracket and a core package is improved through an arc-shaped fitting surface structure, and a gap at an R corner of the core package is further reduced, so that the problem that the R corner pole piece gap is still larger due to the poorer fitting degree of the existing side bracket and the core package is solved; meanwhile, the design of the through holes ensures smooth liquid injection, and finally, the durability of the square-shell winding battery is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the shell winding battery technical field especially, a kind of core package side support and square shell winding battery. BACKGROUND

[0002] With the progress of battery technology, especially the increasing demand for high-capacity and high-energy density batteries, square aluminum shell batteries are popular due to their advantages in power and energy storage applications. The winding structure has become one of the most commonly used packaging methods due to its high production efficiency and relatively low cost. During the manufacturing process, the positive and negative electrode sheets are rotated with a winding needle to form a winding structure, and then undergo cold pressing and hot pressing treatment to finally form a tightly fitted flat core package. Typically, a battery contains 2 or 4 JR (winding structure) inside, which helps to reduce internal resistance and improve production yield.

[0003] In the structure of square shell winding battery, each core package has an R angle on both sides. After being paired into the shell, there is a large gap between the R angles on both sides. On the other hand, after hot pressing, there will be different degrees of gap between the electrode sheets at the R angles on both sides. In the battery cycle, due to the large gap, lithium ions cannot diffuse to the active sites, ultimately leading to lithium precipitation, affecting the service life of the battery. The existing solution to this problem is to set a support at the R angle to fill the gap between the R angle electrode sheets, such as the utility model disclosed in Publication (Announcement) No. CN209389151U, a square lithium ion battery structure for optimizing internal space.

[0004] As in the above technical solution, the cross section of the support is an isosceles triangle, so the fit of the waist surface of the support and the R angle of the core package is poor, making the R angle electrode sheet gap still large, which is not conducive to improving the durability of the square shell winding battery. SUMMARY

[0005] Therefore, the utility model provides a kind of core package side support and square shell winding battery, which improves the fit of the existing side support and core package by arc matching surface structure, thereby reducing the gap at the R angle of the core package, to solve the problem of large R angle electrode sheet gap caused by poor fit of the existing side support and core package, effectively improving the durability of the square shell winding battery.

[0006] The technical solution of the utility model is as follows:

[0007] On the one hand, the utility model provides a kind of core package side support and square shell winding battery, including triangular column, wherein the triangular column is used to fill the gap between the adjacent two core packages;

[0008] Two sides of the triangular column are concave in arc shape and form an arc matching surface respectively.

[0009] The arc-shaped matching surface is used for abutting against the R-angle surface of the side of the core package.

[0010] On the basis of the above technical scheme, preferably, the central angles of the two arc-shaped matching surfaces are equal.

[0011] On the basis of the above technical scheme, preferably, the third side surface of the triangular column is a plane.

[0012] On the basis of the above technical scheme, preferably, a through hole is arranged on the triangular column in the axial direction.

[0013] On the basis of the above technical scheme, preferably, the through hole is a circular hole.

[0014] On the basis of the above technical scheme, preferably, the triangular column is a plastic column.

[0015] In another aspect, the utility model also provides a square shell winding battery, including above-mentioned core package side support, still include shell, wherein,

[0016] At least two core packages are arranged in the shell.

[0017] The two sides of the core package are provided with the R-angle surface, and the filling area is formed between the two adjacent R-angle surfaces.

[0018] One triangular column is arranged in each filling area.

[0019] On the basis of the above technical scheme, preferably, the radial width of the side of the triangular column away from the core package is less than the center distance of the two adjacent R-angle surfaces.

[0020] On the basis of the above technical scheme, preferably, the side of the triangular column away from the core package abuts against the inner surface of the shell.

[0021] On the basis of the above technical scheme, preferably, the core package and the shell are isolated by an insulating heat-conducting film.

[0022] The core package side support and the square shell winding battery of the utility model have the following beneficial effects relative to the prior art:

[0023] (1) the arc-shaped matching surface is used for abutting against the R-angle surface of the side of the core package, which facilitates the improvement of the fit degree of the core package side support and the core package through the structure, and further reduces the gap at the R-angle of the core package, so that the problem of the large gap between the R-angle tabs caused by the poor fit degree of the existing side support and the core package is solved, and the durability of the square shell winding battery is effectively improved.

[0024] (2) the central angles of the arc-shaped matching surfaces are equal, so that the two sides are symmetrical and the pressure is uniformly distributed, which is beneficial to the structural protection of the core package.

[0025] (3) By setting the triangular prism to a plastic prism, the weight of the core pack side support is reduced. At the same time, by setting through holes, it is possible to further reduce the weight of the core pack side support and ensure smooth liquid injection into the outer shell. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Fig. 1 This is a perspective view of a core-side support according to the present invention;

[0028] Fig. 2 This is a partial structural schematic diagram of a square-shell wound battery according to the present invention;

[0029] In the diagram: 1. Triangular prism; 2. Core package; 101. Arc-shaped mating surface; 102. Through hole; 201. R-corner surface; 202. Filling area. Detailed Implementation

[0030] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] like Figs. 1-2 As shown, a core pack side support of this utility model includes a triangular prism 1, which is used to fill the gap between two adjacent core packs 2. Two sides of the triangular prism 1 are concave in an arc shape and each forms an arc-shaped mating surface 101. The arc-shaped mating surface 101 is used to abut against the R-corner surface 201 of the side of the core pack 2.

[0032] This structure improves the fit between the side support of the core pack and the core pack 2, thereby improving the filling effect of the gaps at the R-corners of the core pack 2 and thus enhancing the durability of the square-shell wound battery.

[0033] In the aforementioned core-pack side support, the central angles of the two arc-shaped mating surfaces 101 are equal to ensure symmetrical and uniform pressure distribution on both sides. Meanwhile, the third side of the triangular prism 1 is a plane to facilitate its installation and positioning.

[0034] A through hole 102 is arranged on the triangular column 1 in the axial direction, which is designed as a circular hole, and can also be a hole with other geometric shapes. The hole helps to reduce the weight of the triangular column 1 and ensure smooth liquid injection of the battery shell.

[0035] In addition, the triangular column 1 is a plastic column, such as a PP plastic, which is used for weight reduction of the triangular column 1, while providing good insulation and mechanical strength, and reducing the corrosion probability of the battery shell.

[0036] The above core package side support is applied to a square shell winding battery, and at least two core packages 2 are arranged in the shell of the square shell winding battery, and the shell has a conventional structure, so the drawing is not drawn. Each of the two sides of the core package 2 is provided with an R corner surface 201, and the adjacent two R corner surfaces 201 form a filling area 202. One triangular column 1 is arranged in each filling area 202.

[0037] Among them, the radial width of the side of the triangular column 1 away from the core package 2 is 2-4mm smaller than the center distance of the adjacent two R corner surfaces 201, so as to ensure that it does not exceed the width of the core package 2.

[0038] In addition, the axial length of the above core package side support does not exceed the length of the core package diaphragm.

[0039] The use method of the core package side support and the square shell winding battery of the utility model is as follows:

[0040] After the core package 2 is matched, one triangular column 1 is installed on each of the left and right sides, and after the rubber film is wrapped, it is normally put into the shell. The rubber film is an insulating and heat conducting film, which is used for insulation and heat conduction of the core package 2 and the shell. After being put into the shell, the side of the triangular column 1 away from the core package 2 abuts against the inner surface of the shell. Due to the existence of the core package side support, the R corner gap of the core package 2 is relatively reduced, thereby reducing the risk of lithium precipitation and improving the safety and service life of the battery.

[0041] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A core wrap side branch stent comprising a trigonal prism (1), wherein, The triangular column (1) is used to fill the gap between two adjacent core packs (2); Two sides of the triangular column (1) are concave in arc shape and form two arc matching surfaces (101) respectively; The arc matching surfaces (101) are used to abut against the R-angle surfaces (201) on the side of the core pack (2).

2. A core wrap side shield as defined in claim 1, wherein: The central angles of the two arc matching surfaces (101) are equal.

3. A core wrap side shield as defined in claim 1, wherein: The third side of the triangular column (1) is a plane.

4. The core wrap side shield of claim 1, wherein: An axial through hole (102) is arranged on the triangular column (1).

5. A core wrap side shield as defined in claim 4, wherein: The through hole (102) is a round hole.

6. A core wrap side shield as defined in claim 1, wherein: The triangular column (1) is a plastic column.

7. A square case wound battery characterized by: The core pack side support comprises the core pack side support according to any one of claims 1-6 and a shell, wherein At least two core packs (2) are arranged in the shell; The two sides of the core pack (2) are provided with the R-angle surfaces (201), and the filling area (202) is formed between two adjacent R-angle surfaces (201); One triangular column (1) is arranged in each filling area (202).

8. A square can wrapped battery as defined in claim 7, characterized by: The radial width of the side of the triangular column (1) away from the core pack (2) is smaller than the center distance of two adjacent R-angle surfaces (201).

9. A square can wrapped battery as defined in claim 7, wherein: The side of the triangular column (1) away from the core pack (2) abuts against the inner surface of the shell.

10. A square can wrapped battery as defined in claim 7, wherein: The core pack (2) and the shell are isolated by an insulating and heat-conducting film.

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