CN220106730U - Battery shell and battery - Google Patents

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery shell and a battery, wherein the battery shell comprises a shell, an insulating protection layer is arranged on the inner wall of the shell and used for wrapping a battery cell, the insulating protection layer comprises a side wall protection layer and a bottom wall protection layer, the side wall protection layer is used for being attached to the side wall of the battery cell, the bottom wall protection layer is used for being attached to the bottom wall of the battery cell, so that the battery cell is protected through the side wall protection layer and the bottom wall protection layer, the traditional Mylar film and a bottom bracket sheet can be replaced, a hot melting process between the Mylar film and the bottom bracket sheet is omitted, and the production flow is simplified; the thickness of diapire protective layer is greater than the thickness of lateral wall protective layer to make the structural strength of diapire protective layer be greater than the structural strength of lateral wall protective layer, so that the structural strength of diapire protective layer accords with actual need, in order to reduce the impact that the diapire of shell received, prevent that shell bottom and diapire protective layer from damaging.

Description

Battery shell and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery shell and a battery.

Background

With the development of new energy markets, the market share of electric automobiles is higher and higher, and the demand of power lithium ion batteries is larger and higher.

The conventional battery is generally wrapped by the Mylar film with the bottom adhered to the bottom support sheet, and then the wrapped battery is mounted in the housing of the battery, but the problem is that the Mylar film and the bottom support sheet are generally fixed together through hot melt adhesion, the process flow is complex, and the bottom support sheet is easy to fall off from the Mylar film, so that the housing is damaged.

In view of this, the prior art provides a battery case, in which a protective layer is provided inside the case to replace the Mylar film in the conventional art, so that the hot-melting process in the assembly of the battery can be simplified to reduce the manufacturing cost. However, the battery cell has a problem that the bottom of the battery cell is easily collided with the bottom of the protection layer due to the influence of vehicle jolting and the like, so that the bottom of the protection layer and the shell are damaged.

Disclosure of Invention

According to one aspect of the utility model, the utility model provides a battery case, so as to solve the problem that the bottom of a battery cell is easy to collide with the bottom of a protection layer, and the bottom of the case and the protection layer are damaged in the prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the battery shell is used for wrapping the battery cell, the battery cell is provided with a battery cell bottom wall and a battery cell top wall which are oppositely arranged, and a battery cell side wall which is positioned between the battery cell bottom wall and the battery cell top wall, the battery shell comprises a shell, the inner wall of the shell is provided with an insulating protection layer, the insulating protection layer is used for wrapping the battery cell, the insulating protection layer comprises a side wall protection layer and a bottom wall protection layer, the side wall protection layer is used for being attached to the battery cell side wall, the bottom wall protection layer is used for being attached to the battery cell bottom wall, and the thickness of the bottom wall protection layer is larger than that of the side wall protection layer.

As a preferable mode of the battery case, a ratio of a thickness of the bottom wall protective layer to a thickness of the side wall protective layer is not less than 5:1.

as the preferred scheme of battery case, the shell includes shell lateral wall and shell diapire, the lateral wall protective layer set up in the shell lateral wall, the diapire protective layer set up in the shell diapire, the thickness of shell diapire is greater than the thickness of shell lateral wall.

As a preferable mode of the battery case, a ratio of a thickness of the bottom wall of the case to a thickness of the side wall of the case is not less than 1.5:1.

as the preferred scheme of battery casing, the electric core is square electric core, the shell lateral wall includes two relative first lateral walls that set up and two relative second lateral walls that set up, the area of first lateral wall is greater than the area of second lateral wall, the thickness of second lateral wall is greater than the thickness of first lateral wall.

As a preferred scheme of the battery shell, the battery cell side wall comprises a battery cell front side wall, a battery cell rear side wall, a battery cell left side wall and a battery cell right side wall, wherein the battery cell front side wall and the battery cell rear side wall are oppositely arranged, and the area of the battery cell front side wall is larger than that of the battery cell left side wall; the side wall protection layers comprise two oppositely arranged first protection layers and two oppositely arranged second protection layers, the two first protection layers are arranged on the inner sides of the two first side walls in a one-to-one correspondence manner, and the two first protection layers are respectively used for wrapping the front side wall and the rear side wall of the battery cell; the two second protection layers are arranged on the inner sides of the two second side walls in a one-to-one correspondence mode, and the two second protection layers are respectively used for wrapping the left side wall and the right side wall of the battery cell.

As a preferable mode of the battery case, the thickness of the first protective layer is the same as the thickness of the second protective layer.

According to another aspect of the present utility model, there is provided a battery comprising a battery cell, and the above battery case for wrapping the battery cell.

As the preferred scheme of battery, still including set up in the apron of shell, the apron is provided with explosion-proof valve and annotate the liquid hole.

As a preferred scheme of the battery, the battery further comprises two polar posts arranged on the battery core.

The beneficial effects of the utility model are as follows:

the utility model provides a battery shell, which comprises a shell, wherein the inner wall of the shell is provided with an insulating protection layer, the insulating protection layer is used for wrapping a battery cell, the insulating protection layer comprises a side wall protection layer and a bottom wall protection layer, the side wall protection layer is used for being attached to the side wall of the battery cell, the bottom wall protection layer is used for being attached to the bottom wall of the battery cell, so that the battery cell is protected through the side wall protection layer and the bottom wall protection layer, the traditional Mylar film and a bottom bracket sheet can be replaced, the hot melting process between the Mylar film and the bottom bracket sheet is omitted, and the production flow is simplified. The thickness of diapire protective layer is greater than the thickness of lateral wall protective layer to make the structural strength of diapire protective layer be greater than the structural strength of lateral wall protective layer, so that the structural strength of diapire protective layer accords with actual need, in order to reduce the impact that the bottom of shell received, prevent that shell bottom and diapire protective layer from damaging.

The utility model also provides a battery, which comprises the battery shell, wherein the insulating protective layer in the battery shell can provide protection for the battery core and can replace the traditional Mylar film and the bottom support sheet so as to simplify the assembly process of the battery, and meanwhile, the structural strength of the bottom wall protective layer meets the actual requirement so as to reduce the impact on the bottom of the shell and prevent the bottom of the shell and the bottom wall protective layer from being damaged.

Drawings

Fig. 1 is a schematic view of a battery case according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of a battery case according to a second embodiment of the present utility model;

FIG. 3 is a schematic side view of a battery housing in an embodiment of the utility model;

fig. 4 is an enlarged view at a in fig. 3;

fig. 5 is a schematic view of the structure of a battery in an embodiment of the present utility model.

In the figure:

1. a housing; 11. a housing sidewall; 111. a first sidewall; 112. a second sidewall; 12. a housing bottom wall;

2. an insulating protective layer; 21. a sidewall protection layer; 211. a first protective layer; 212. a second protective layer; 22. a bottom wall protection layer;

100. a cover plate; 101. an explosion-proof valve; 102. a liquid injection hole; 200. a pole.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The conventional battery is generally wrapped by the Mylar film with the bottom adhered to the bottom support sheet, and then the wrapped battery is mounted in the housing of the battery, but the problem is that the Mylar film and the bottom support sheet are generally fixed together through hot melt adhesion, the process flow is complex, and the bottom support sheet is easy to fall off from the Mylar film, so that the housing is damaged. In view of this, the prior art provides a battery case, in which a protective layer is provided inside the case to replace the Mylar film in the conventional art, so that the hot-melting process in the assembly of the battery can be simplified to reduce the manufacturing cost. However, the battery cell has a problem that the bottom of the battery cell is easily collided with the bottom of the protection layer due to the influence of vehicle jolting and the like, so that the bottom of the protection layer and the shell are damaged.

To above-mentioned problem, this embodiment provides battery case to solve among the prior art the bottom of electric core and bump with the bottom of protective layer easily, lead to the problem that the bottom of casing and protective layer damaged, can be used to battery technology field.

Referring to fig. 1-4, a battery case is used for wrapping a battery cell, the battery cell is provided with a battery cell bottom wall and a battery cell top wall which are oppositely arranged, and a battery cell side wall which is positioned between the battery cell bottom wall and the battery cell top wall, the battery case comprises a shell 1, the inner wall of the shell 1 is provided with an insulating protection layer 2, the insulating protection layer 2 is used for wrapping the battery cell, the insulating protection layer 2 comprises a side wall protection layer 21 and a bottom wall protection layer 22, the side wall protection layer 21 is used for being attached to the battery cell side wall, and the battery cell is protected through the side wall protection layer 21 and the bottom wall protection layer 22, so that the traditional Mylar film and a bottom support sheet can be replaced, and a hot melting process between the Mylar film and the bottom support sheet is omitted, and the production flow is simplified. Alternatively, the insulating protective layer 2 is applied to the inner wall of the housing 1 by means of electrostatic spraying. In this embodiment, the housing 1 is an aluminum housing, and the insulating film 2 is made of a thermoplastic resin material.

With continued reference to fig. 1-4, the thickness of the bottom wall protection layer 22 is greater than the thickness of the side wall protection layer 21, so that the structural strength of the bottom wall protection layer 22 is greater than the structural strength of the side wall protection layer 21, so that the structural strength of the bottom wall protection layer 22 meets the actual requirement, the impact on the bottom of the casing 1 is reduced, and the bottom of the casing and the bottom wall protection layer 22 are prevented from being damaged. Optionally, to ensure that the structural strength of the bottom wall protection layer 22 meets design requirements, the ratio of the thickness of the bottom wall protection layer 22 to the thickness of the side wall protection layer 21 is not less than 5:1, for example, in the present embodiment, the thickness of the side wall wrapping film 21 is 100 μm and the thickness of the bottom wall wrapping film 22 is 500 μm.

With continued reference to fig. 1-4, the housing 1 includes a housing sidewall 11 and a housing bottom wall 12, a sidewall protection layer 21 is disposed on the housing sidewall 11, a bottom wall protection layer 22 is disposed on the housing bottom wall 12, and the thickness of the housing bottom wall 12 is greater than that of the housing sidewall 11, so that the structural strength of the housing bottom wall 12 is greater than that of the housing sidewall 11, and the structural strength of the bottom wall protection layer 22 can be further enhanced by the housing bottom wall 12 to prevent the battery cell from being damaged. Optionally, the ratio of the thickness of the housing bottom wall 12 to the thickness of the housing side wall 11 is not less than 1.5:1 to ensure that the structural strength of the housing bottom wall 12 meets design requirements.

1-4, the battery cell is a square battery cell, and the battery cell side wall comprises a battery cell front side wall and a battery cell rear side wall which are oppositely arranged, and a battery cell left side wall and a battery cell right side wall which are oppositely arranged, wherein the area of the battery cell front side wall is larger than that of the battery cell left side wall; the housing sidewall 11 includes two oppositely disposed first sidewalls 111 and two oppositely disposed second sidewalls 112, the area of the first sidewalls 111 is larger than that of the second sidewalls 112, so in practical use, the second sidewalls 112 are used to support the left or right cell sidewalls of the cell, the stress is larger than that of the first sidewalls 111, and in order to adapt to the feature, the thickness of the second sidewalls 112 is larger than that of the first sidewalls 111. In this embodiment, the thickness of the bottom wall 12 of the housing is 1200 μm, the thickness of the first side wall 111 is 600 μm, and the thickness of the second side wall 112 is 800 μm.

With continued reference to fig. 1-4, the sidewall protection layer 21 includes two oppositely disposed first protection layers 211 and two oppositely disposed second protection layers 212, where the two first protection layers 211 are disposed on the inner sides of the two first sidewalls 111 in a one-to-one correspondence, and the two first protection layers 211 are respectively used to wrap the front sidewall and the rear sidewall of the battery cell; the two second protection layers 212 are disposed on the inner sides of the two second side walls 112 in a one-to-one correspondence manner, and the two second protection layers 212 are respectively used for wrapping the left side wall and the right side wall of the battery cell, so that the side wall protection layers 21 are adapted to the side wall shape of the square battery cell.

With continued reference to fig. 1-4, since the thickness of the second sidewall 112 is greater than that of the first sidewall 111 in the sidewall 11 of the housing, the structural strength of the sidewall can already meet the requirements of the battery cell, so that the thickness of the first protection layer 211 is the same as that of the second protection layer 212 in order to save the processing procedure, in this embodiment, the thicknesses of the first protection layer 211 and the second protection layer 212 are both 100 μm.

The processing method of the battery shell comprises the steps of firstly completing the processing of the shell 1, then spraying an insulating protection layer 2 on the inner wall of the shell 1 by an electrostatic spraying mode, specifically spraying a layer of coating with the thickness of 100 μm on each of the first side wall 111 and the second side wall 112, namely a first protection layer 211 and a second protection layer 212, and spraying five layers of coating with the thickness of 100 μm on the bottom wall 12 of the shell, namely a bottom wall protection layer 22, so that the thickness of the bottom wall protection layer 22 reaches 500 μm.

Referring to fig. 5, the present embodiment further provides a battery, including a battery core, and the above-mentioned battery case, the battery case is used for wrapping the battery core, and the insulating protection layer 2 in the battery case can provide protection for the battery core, and can replace the traditional Mylar film and the bottom bracket sheet, so as to simplify the assembly process of the battery, and meanwhile, the structural strength of the bottom wall protection layer 22 meets the actual requirement, so as to reduce the impact on the bottom of the housing 1, and prevent the bottom of the housing 1 and the bottom wall protection layer 22 from being damaged.

With continued reference to fig. 5, the battery further includes a cover plate 100 disposed on the housing 1, where the cover plate 100 is provided with an explosion-proof valve 101 and a liquid injection hole 102, and the cover plate 100 is located above the battery cell, where the explosion-proof valve 101 is used to discharge high-pressure gas when the battery cell is thermally out of control, and the explosion-proof valve 101 is an existing structure in the prior art, and its specific structure and principle are not repeated. The electrolyte injection hole 102 is used for injecting electrolyte after assembly.

With continued reference to fig. 5, the battery also includes two poles 200 disposed on the electrical core, wherein one pole 200 is a positive pole and the other is a negative pole.

After finishing the processing of the battery shell, the assembling and manufacturing process of the battery is that positive and negative electrode materials, corresponding binders and conductive agents are respectively prepared into slurry in a homogenate mode, then the positive and negative electrode slurry is uniformly coated on a current collector to prepare positive and negative electrode plates, the positive and negative electrode plates are rolled according to the designed compaction density through a roll squeezer, and then the positive and negative electrode plates are cut, die-cut, wound or laminated to obtain corresponding winding cores or laminated cores, and the winding cores or laminated cores with different numbers are continuously stacked in parallel according to the design requirement, wherein the number of common parallel winding cores or laminated cores is 1, 2 or 4; then, the electrode lugs and the switching pieces on the parallel battery cells are subjected to ultrasonic welding, then the battery cells and the electrode posts 200 on the cover plate 100 are subjected to laser welding, the welded battery cells are placed into the shell 1, the cover plate 100 and the shell 1 are subjected to laser welding and sealing, then electrolyte is injected through the liquid injection holes 102, and finally the battery cells are subjected to formation and capacity division procedures to finish the manufacture of single finished aluminum-shell battery cells.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The battery shell is used for wrapping a battery cell, the battery cell is provided with a battery cell bottom wall and a battery cell top wall which are oppositely arranged, and a battery cell side wall which is positioned between the battery cell bottom wall and the battery cell top wall, and is characterized in that the battery shell comprises a shell (1), an insulating protection layer (2) is arranged on the inner wall of the shell (1), the insulating protection layer (2) is used for wrapping the battery cell, the insulating protection layer (2) comprises a side wall protection layer (21) and a bottom wall protection layer (22), the side wall protection layer (21) is used for being attached to the battery cell side wall, the bottom wall protection layer (22) is used for being attached to the battery cell bottom wall, and the thickness of the bottom wall protection layer (22) is larger than that of the side wall protection layer (21).

2. The battery case according to claim 1, wherein a ratio of a thickness of the bottom wall protective layer (22) to a thickness of the side wall protective layer (21) is not less than 5:1.

3. the battery housing according to claim 1, wherein the casing (1) includes a casing side wall (11) and a casing bottom wall (12), the side wall protection layer (21) is provided to the casing side wall (11), the bottom wall protection layer (22) is provided to the casing bottom wall (12), and a thickness of the casing bottom wall (12) is greater than a thickness of the casing side wall (11).

4. A battery case according to claim 3, wherein the ratio of the thickness of the case bottom wall (12) to the thickness of the case side wall (11) is not less than 1.5:1.

5. a battery housing according to claim 3, wherein the cells are square cells, the housing side walls (11) comprising two oppositely arranged first side walls (111) and two oppositely arranged second side walls (112), the first side walls (111) having an area larger than the area of the second side walls (112), the second side walls (112) having a thickness larger than the thickness of the first side walls (111).

6. The battery housing of claim 5, wherein the cell side walls comprise oppositely disposed cell front side walls and cell rear side walls, and oppositely disposed cell left side walls and cell right side walls, the cell front side walls having an area greater than an area of the cell left side walls; the side wall protection layer (21) comprises two oppositely arranged first protection layers (211) and two oppositely arranged second protection layers (212), the two first protection layers (211) are arranged on the inner sides of the two first side walls (111) in a one-to-one correspondence manner, and the two first protection layers (211) are respectively used for wrapping the front side wall and the rear side wall of the battery cell; the two second protection layers (212) are arranged on the inner sides of the two second side walls (112) in a one-to-one correspondence manner, and the two second protection layers (212) are respectively used for wrapping the left side wall and the right side wall of the battery cell.

7. The battery case according to claim 6, wherein the thickness of the first protective layer (211) is the same as the thickness of the second protective layer (212).

8. A battery comprising a cell and a battery housing according to any one of claims 1-7 for encasing the cell.

9. The battery according to claim 8, further comprising a cover plate (100) provided to the housing (1), the cover plate (100) being provided with an explosion-proof valve (101) and a liquid filling hole (102).

10. The battery according to claim 8, further comprising two posts (200) disposed on the cells.