Battery shell structure and battery

Abstract

The utility model relates to a battery shell structure and a battery, the battery shell structure comprises a shell and a protective layer group, and the shell is used for accommodating a core package; a first protection area is arranged on the inner wall of the shell; the protective layer group at least comprises a first protective layer and a second protective layer; the first protection layer covers the first protection area; the second protection layer is arranged on the first protection layer to realize isolation protection of the core cladding, the first protection layer has an isolation effect on the core cladding to prevent the core cladding and electrolyte in the shell from corroding the shell, and the second protection layer is arranged on the first protection layer to further enhance the thickness and strength of the protection layer of the first protection area. Therefore, the sharp part of the core package is prevented from puncturing the first protection layer, the direct contact between the powder falling from the core package and the shell is effectively isolated, the corrosion resistance of the shell is improved, and the safety of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery shell structure and a battery. BACKGROUND

[0002] The battery shell is an important component of the battery, which can protect the electrodes and electrolyte inside the battery from external factors such as mechanical damage, chemical corrosion, etc. It can also provide a stable structure for the battery to ensure that the battery can maintain a stable form and performance during use.

[0003] At present, the existing battery shell is easily pierced by the sharp part of the core package, which can cause the core package to drop powder and cause the battery shell to be corroded. CONTENT OF THE INVENTION

[0004] Therefore, a battery shell structure and a battery are provided.

[0005] In a first aspect, the present application provides a battery shell structure, comprising:

[0006] The shell is used to accommodate the core package, and the inner wall of the shell is provided with a first protection area;

[0007] The protection layer group comprises at least a first protection layer and a second protection layer, the first protection layer is arranged on the first protection area, and the second protection layer is arranged on the first protection layer.

[0008] In one embodiment, the first protection area comprises a plurality of protection sub-areas.

[0009] The first protection layer and the second protection layer are arranged in the protection sub-areas in sequence.

[0010] In one embodiment, the coverage area of the protection layer group is less than the inner wall area of the shell.

[0011] In one embodiment, the inner wall of the shell is further provided with a bare area, and the bare area is used to fit the cover.

[0012] In one embodiment, the thickness of the first protection layer is less than the thickness of the second protection layer.

[0013] In one embodiment, the thickness of the first protection layer ranges from 10 microns to 50 microns.

[0014] In one embodiment, the thickness of the second protection layer ranges from 40 microns to 70 microns.

[0015] In one embodiment, the first protection layer comprises any one or any combination of the following: a polypropylene layer, a polyethylene terephthalate layer, a polycarbonate layer, and a polytetrafluoroethylene layer.

[0016] The second protective layer comprises any one or any combination of a polypropylene layer, a polyethylene terephthalate layer, a polycarbonate layer, and a polytetrafluoroethylene layer, and the material of the second protective layer is different from the material of the first protective layer.

[0017] In one of the embodiments, the protective layer group further comprises a third protective layer, and the third protective layer covers the outer wall of the shell.

[0018] In a second aspect, the application provides a battery comprising a core package and the battery shell structure according to any one of the above; the core package is arranged in the battery shell structure.

[0019] One of the above technical solutions has the following advantages and beneficial effects:

[0020] In the battery shell structure, the shell is used for accommodating the core package; the inner wall of the shell is provided with a first protection area; the protective layer group comprises at least a first protective layer and a second protective layer; the first protective layer is arranged on the first protection area; and the second protective layer is arranged on the first protective layer, thereby achieving isolation protection of the core package, avoiding corrosion of the shell by the electrolyte, and improving the safety performance of the battery. In the application, the first protection area is arranged on the inner surface of the shell, the first protective layer is arranged on the first protection area, and the first protective layer then plays a role of isolation of the core package, preventing the electrolyte in the core package and the shell from corroding the shell. The second protective layer is arranged on the first protective layer, thereby enhancing the thickness and strength of the protective layer of the first protection area, preventing the sharp part of the core package from piercing the first protective layer, effectively isolating the powder falling from the core package from directly contacting the shell, improving the corrosion resistance of the shell, and thus improving the safety of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a first perspective structural schematic diagram of a battery shell structure in an embodiment of the application;

[0022] Figure 2 FIG. 2 is a second perspective structural schematic diagram of the battery shell structure in the embodiment of the application; Figure 1 FIG. 3 is an enlarged structural schematic diagram of position A in FIG. 2;

[0023] Figure 3 FIG. 4 is an exploded structural schematic diagram of the battery shell structure in the embodiment of the application;

[0024] Figure 4 FIG. 5 is a first perspective partial structural schematic diagram of a cross section of the battery shell structure in the embodiment of the application;

[0025] Figure 5 FIG. 6 is a second perspective partial structural schematic diagram of a cross section of the battery shell structure in the embodiment of the application;

[0026] Figure 6A first perspective view of a battery shell structure according to an embodiment of the present application;

[0027] Figure 7 A first perspective view of a battery shell structure according to an embodiment of the present application; Figure 6 An enlarged view of the structure at B in the middle.

[0028] Reference signs:

[0029] 10, shell; 110, first protection area; 122, protection sub-area; 130, exposed area; 20, protection layer set; 210, first protection layer; 220, second protection layer; 230, third protection layer. DETAILED DESCRIPTION

[0030] In order to make the personnel in the technical field better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0031] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that comprises a series of steps or units does not necessarily limit to those clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0032] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0033] Moreover, the above-mentioned partial terms can be used to represent other meanings in addition to the orientation or positional relationship, for example, the term "upper" can also be used to represent a certain dependent relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0034] In addition, the meaning of the term "a plurality of" should be two and more than two.

[0035] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] In one embodiment, as shown in Figure 1 、 Figure 2 and Figure 5 , a battery shell structure is provided, including a shell 10 and a protection layer group 20, the shell 10 is used to accommodate a core package; the inner wall of the shell 10 is provided with a first protection area 110; the protection layer group 20 at least includes a first protection layer 210 and a second protection layer 220; the first protection layer 210 is covered and arranged on the first protection area 110; the second protection layer 220 is arranged on the first protection layer 210.

[0037] Wherein, the shell 10 is used to wrap the core package, for example, the shell 10 is provided with a receiving cavity and a first opening, the first opening is in communication with the receiving cavity, and then the core package can be inserted into the receiving cavity from the first opening to realize the wrapping of the core package. The shape and size of the shell 10 can be determined according to the shape and size of the core package, for example, the core package is in a square shape structure, and then the shell 10 can be provided in a square shape. The shell 10 can be an aluminum shell 10, in another example, the shell 10 can also be a copper shell, a steel shell or an aluminum alloy shell. The core package can be a lithium ion core package, for example, the core package can have one single core package, and in another example, the core package can also have at least two single core packages connected in series and / or in parallel.

[0038] The inner wall of the shell 10 refers to the inner surface of the shell 10, that is, the inner wall of the shell 10 is the inner wall of the receiving cavity of the shell 10. The first protection area 110 refers to the area for completely fitting the outer surface of the core package. For example, the area of the first protection area 110 is smaller than the area of the inner wall of the shell 10, and then a certain space is reserved for covering the first opening of the shell 10 with a cover to realize the sealing of the shell 10.

[0039] The outer surface of the core package can be divided into a sharp surface area and a smooth surface area. The sharp surface area of the core package can be an area at a corner of the core package. The sharp surface area of the core package can also be an area where electrolyte leakage or powder dropping is easy to occur. For example, the first protection area 110 is arranged at a position corresponding to the sharp surface area of the core package. For example, the sharp surface area of the core package is located at the bottom of the core package, and the first protection area 110 is arranged at the bottom of the inner wall of the shell 10.

[0040] The protection layer set 20 can include at least two protection layers. For example, the protection layer set 20 includes at least a first protection layer 210 and a second protection layer 220. The protection layer set 20 can be made of a corrosion-resistant material. The protection layer set 20 can also be made of a material with a certain strength. For example, the protection layer set 20 can be made of a plastic material.

[0041] The first protection layer 210 can be arranged on the first protection area 110 by spraying or bonding. The first protection layer 210 can completely cover the first protection area 110 of the shell 10. When the core package is arranged in the shell 10, the first protection layer 210 can completely adhere to the outer surface of the core package. The electrolyte in the core package and the shell or the powder dropped by the core package cannot directly contact the inner wall of the shell 10, so as to prevent the shell 10 from being corroded by the leaked electrolyte or powder.

[0042] The second protection layer 220 can be arranged on the first protection layer 210 corresponding to the first protection area 110 by spraying or bonding. The second protection layer 220 can completely cover the first protection layer 210, so as to increase the thickness of the protection layer of the first protection area 110. The protection strength of the first protection area 110 is enhanced, so as to prevent the sharp surface area of the core package from piercing the inner surface of the shell 10, thereby improving the safety of the battery.

[0043] In the above embodiment, the shell 10 is used to accommodate the core package; the inner wall of the shell 10 is provided with a first protection area 110; the protection layer group 20 at least includes a first protection layer 210 and a second protection layer 220; the first protection layer 210 is arranged on the first protection area 110; the second protection layer 220 is arranged on the first protection layer 210, so as to achieve isolation protection of the core package, avoid corrosion of the electrolyte to the shell 10, and improve the safety performance of the battery. In the present application, the first protection area 110 is arranged on the inner surface of the shell 10, the first protection layer 210 is arranged on the first protection area 110, and then the first protection layer 210 plays a role of isolation for the core package, so as to prevent the electrolyte in the core package and the shell 10 from corroding the shell 10. The second protection layer 220 is arranged on the first protection layer 210, so as to increase the thickness and strength of the protection layer of the first protection area 110, avoid the sharp part of the core package from piercing the first protection layer 210, achieve effective isolation of the powder falling from the core package from directly contacting the shell, improve the corrosion resistance of the shell 10, and thus improve the safety of the battery

[0044] In one embodiment, as shown in Figure 4 the first protection area 110 includes a plurality of protection sub-areas 122; each protection sub-area 122 is sequentially stacked with the first protection layer 210 and the second protection layer 220.

[0045] Among them, the protection sub-area 122 can be dispersedly arranged on the inner wall of the shell 10. The shape and size of the protection sub-area 122 are the same as those of the corresponding corner sub-area. The corner sub-area can be a corner sub-area of the bottom of the core package, for example, the corner sub-area can be a left corner sub-area or a right corner sub-area of the bottom of the core package. It should be noted that the shape and size of the corner sub-area of the core package are different for different models of batteries, and the protection sub-area 122 on the inner wall of the shell 10 is arranged according to the corresponding model of the battery.

[0046] By arranging the protection sub-area 122 corresponding to each corner sub-area in the first protection area 110, the first protection layer 210 is arranged on the first protection area 110, so that the first protection layer 210 covers each protection sub-area 122; then, the second protection layer 220 is arranged on each protection sub-area 122, so that the second protection layer 220 can cover each protection sub-area 122, and then when the core package is arranged in the shell 10, the first protection layer 210 can isolate the electrolyte in the core package and the shell or the powder falling from the core package, so as to avoid corrosion of the shell 10 by the leaked electrolyte or powder; by arranging the double protection layers on the protection sub-area 122, the thickness of the protection layer of the protection sub-area 122 is increased, and then the protection strength of the first protection area 110 is enhanced, so as to prevent the sharp surface area of the core package from piercing the inner surface of the shell 10, thereby improving the safety of the battery.

[0047] On the other hand, the outer surface of the core package does not need to be additionally wrapped with a protective film, thereby eliminating the mylar film (a film made of a tough polyester polymer) of the core package, simplifying the steps of fusing the mylar film with the bottom support sheet, wrapping the core package with the mylar film, fusing the mylar film with the lower plastic of the cover plate, and the like in the battery assembly process, and improving the battery assembly efficiency.

[0048] In one example, by arranging the first protective layer 210 and the second protective layer 220 on the first protection area 110 of the inner wall of the shell 10, the first protective layer 210 and the second protective layer 220 are tightly combined with each other, so that the protective layer group 20 composed of the inner wall of the shell 10 has high-temperature resistance, for example, the protective layer group 20 does not melt below 200℃; at the same time, the protective layer group 20 has low-temperature resistance, for example, the protective layer group 20 does not significantly deform and fall off even when reaching -40℃.

[0049] In one embodiment, as shown in Figure 2 , Figure 3 and Figure 7 , the second protective layer 220 is arranged on the first protective layer 210.

[0050] The second protective layer 220 can be completely arranged on the first protective layer 210 by spraying or bonding, that is, the second protective layer 220 can not only completely cover the first protective layer 210, but also cover the first protection area 110, thereby further simplifying the operation of arranging the protective layer on the battery shell 10, and having good anti-electrolyte or powder corrosion performance, effectively isolating the electrolyte or powder from the inner surface of the aluminum shell, in addition, further strengthening the protection strength of the inner wall of the shell 10, preventing the sharp surface area of the core package from piercing the inner surface of the shell 10, and improving the safety of the battery.

[0051] In one embodiment, the coverage area of the protective layer group 20 is smaller than the area of the inner wall of the shell 10, thereby facilitating the arrangement of the cover on the shell 10, realizing the tight connection between the cover and the shell, and thereby eliminating the need to modify the size of the cover, and improving the convenience of assembling the shell 10.

[0052] In one embodiment, as shown in Figure 4 , Figure 6 and Figure 7 , the inner wall of the shell 10 further comprises a bare area 130, and the bare area 130 is used to fit the cover.

[0053] For example, the shell 10 is provided with a first opening for covering the cover body, the exposed area 130 is arranged adjacent to the first opening of the shell 10, the cover body is provided with an extension edge, and when the cover body is inserted into the first opening, the extension edge of the cover body can be tightly fitted on the exposed area 130 of the shell 10 to realize the sealing of the shell 10. For example, the cover body is provided with a positive electrode connector and a negative electrode connector, the positive electrode of the core package is connected to the positive electrode connector of the cover body, and the negative electrode of the core package is connected to the negative electrode connector of the cover body.

[0054] In one example, the exposed area 130 has a ring shape, and the height of the exposed area 130 can be set to be between 2 mm and 4 mm. For example, the height of the exposed area 130 can be set to be 3 mm or 4 mm, so as to fit the cover body with the exposed area 130 of the shell 10, thereby improving the convenience of assembling the shell 10 without modifying the size of the cover body.

[0055] In one embodiment, the thickness of the first protective layer 210 is less than the thickness of the second protective layer 220, so that the first protective layer 210 can completely cover the first protective area 110 of the shell 10, and when the core package is arranged in the shell 10, the first protective layer 210 can completely fit the outer surface of the core package, avoiding the inner wall of the shell 10 directly contacted by the electrolyte or the powder dropped by the core package in the shell, preventing the shell 10 from being corroded by the leaked electrolyte or powder; the second protective layer 220 can completely cover the first protective layer 210, so that the thickness of the protective layer of the first protective area 110 is increased, thereby enhancing the protection strength of the first protective area 110, preventing the sharp surface area of the core package from piercing the inner surface of the shell 10, and thus improving the safety of the battery.

[0056] In one embodiment, the thickness of the first protective layer 210 ranges from 10 microns to 50 microns.

[0057] In one embodiment, the thickness of the first protective layer 210 ranges from 10 microns to 50 microns.

[0058] In one embodiment, the thickness of the second protective layer 220 ranges from 40 microns to 70 microns.

[0059] The thickness of the second protective layer 220 is set to be microns. For example, the thickness of the second protective layer 220 can be set to 40 microns, 50 microns or 70 microns. By spraying or bonding the second protective layer 220 with a preset thickness on the first protective layer 210, the second protective layer 220 can completely cover the first protective layer 210, so that the thickness of the protective layer of the first protection area 110 is increased, thereby enhancing the protection strength of the first protection area 110, preventing the sharp surface area of the core package from piercing the inner surface of the shell 10, thereby improving the safety of the battery. In addition, by setting the thickness of the second protective layer 220 to be microns, the anti-piercing effect can be achieved, while the overall volume change of the shell 10 is small.

[0060] In one embodiment, the first protective layer 210 includes any one or any combination of the following: a polypropylene (PP) layer, a polyethylene terephthalate (PET) layer, a polycarbonate (PC) layer and a polytetrafluoroethylene (PTFE) layer.

[0061] For example, the first protective layer 210 can be a protective layer made of polypropylene, and for another example, the first protective layer 210 can also be a combined protective layer made of polypropylene and polycarbonate.

[0062] For example, by covering the first protection area 110 of the shell 10 with a polypropylene protective layer with a thickness of 20 microns, the first protective layer 210 plays an isolation role for the core package, preventing the core package and the electrolyte in the shell from corroding the shell 10, and can isolate the powder falling from the core package from directly contacting the shell 10, thereby improving the corrosion resistance of the shell 10.

[0063] In one embodiment, the second protective layer 220 includes any one or any combination of the following: a polypropylene layer, a polyethylene terephthalate layer, a polycarbonate layer and a polytetrafluoroethylene layer, and the material of the second protective layer 220 is different from that of the first protective layer 210.

[0064] For example, the second protective layer 220 can be a protective layer made of polytetrafluoroethylene, and for another example, the second protective layer 220 can also be a combined protective layer made of polypropylene and polytetrafluoroethylene.

[0065] For example, by setting the second protective layer 220 with a thickness of 50 microns on the first protective layer 210, the thickness and strength of the protective layer of the first protection area 110 are enhanced, avoiding the sharp surface area of the core package from piercing the inner surface of the shell 10, thereby improving the safety of the battery.

[0066] In one embodiment, as Figure 2 , Figure 3 and Figure 7As shown, the protection layer group 20 further comprises a third protection layer 230, the third protection layer 230 covers the outer wall of the shell 10.

[0067] The third protection layer 230 can be an insulating protective layer, for example, the third protection layer 230 can be formed by any one or any combination of a polypropylene layer, a polyethylene terephthalate layer, a polycarbonate layer, and a polytetrafluoroethylene layer.

[0068] For example, the third protection layer 230 can be arranged on the outer wall of the shell 10 by spraying or bonding, so as to completely cover the outer surface of the shell 10, and thus play an insulating protective role on the outer surface of the shell 10, and enhance the reliability of the battery shell 10.

[0069] In one embodiment, a battery is also provided, comprising a core package and a battery shell structure according to any one of the above embodiments; the core package is arranged in the battery shell structure.

[0070] For the specific description of the core package and the battery shell structure, reference can be made to the specific description of the core package and the battery shell structure in the above embodiments, which will not be repeated here.

[0071] The battery shell structure comprises a shell and a protection layer group, and the core package is arranged in the shell; the inner wall of the shell is provided with a first protective area; the protection layer group comprises at least a first protection layer and a second protection layer; the first protection layer is arranged on the first protective area; and the second protection layer is arranged on the first protection layer, so as to insulate and protect the core package, prevent the electrolyte in the core package and the shell from corroding the shell, and improve the safety performance of the battery.

[0072] In the above embodiments, the first protective area is arranged on the inner surface of the shell, the first protection layer is arranged on the first protective area, and the first protection layer insulates the core package, so as to prevent the electrolyte in the core package and the shell from corroding the shell; the second protection layer is arranged on the first protection layer, so as to enhance the thickness and strength of the protection layer of the first protective area, prevent the sharp part of the core package from piercing the first protection layer, effectively insulate the powder falling from the core package from directly contacting the shell, and improve the corrosion resistance of the shell, thereby improving the safety of the battery.

[0073] It should be noted that the battery can also comprise positive and negative poles and other components, and the specific battery can comprise more components than those described in the above embodiments, or some components can be combined, or have different component arrangements.

[0074] The technical features of the above embodiments can be combined in any manner. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0075] The above embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which all belong to the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A battery case structure characterized by comprising: The application relates to a battery shell structure. The shell is used for accommodating a core package; an inner wall of the shell is provided with a first protection area; A protection layer group comprises at least a first protection layer and a second protection layer; the first protection layer covers the first protection area; and the second protection layer is arranged on the first protection layer.

2. The battery case structure according to claim 1, wherein The first protection area comprises a plurality of protection sub-areas. Each protection sub-area is sequentially provided with the first protection layer and the second protection layer.

3. The battery case structure according to claim 1, wherein The coverage area of the protection layer group is smaller than the inner wall area of the shell.

4. The battery case structure according to claim 3, wherein The inner wall of the shell is further provided with a bare area for attaching a cover.

5. The battery case structure according to claim 1, wherein The thickness of the first protection layer is smaller than that of the second protection layer.

6. The battery case structure according to claim 5, wherein The thickness of the first protection layer ranges from 10 microns to 50 microns.

7. The battery case structure according to claim 5, wherein The thickness of the second protection layer ranges from 40 microns to 70 microns.

8. The battery case structure according to claim 1, wherein The first protection layer comprises any one of a polypropylene layer, a polyethylene terephthalate layer, a polycarbonate layer and a polytetrafluoroethylene layer. The second protection layer comprises any one of a polypropylene layer, a polyethylene terephthalate layer, a polycarbonate layer and a polytetrafluoroethylene layer, and the material of the second protection layer is different from that of the first protection layer.

9. The battery case structure according to any one of claims 1 to 8, wherein The protection layer group further comprises a third protection layer which covers the outer wall of the shell.

10. A battery, characterized by The application further relates to a battery comprising the battery shell structure and the core package.

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