Battery and electric device

Abstract

The utility model discloses a kind of battery and electrical equipment, battery includes: battery core;Shell, with storage cavity, the battery core is set in the storage cavity, the cavity wall of the storage cavity includes first wall and second wall, the second wall surrounds the circumferential edge connected to the first wall, the two sides of the first wall thickness direction respectively have first thinning area and second thinning area.The battery of the utility model can have higher energy density.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery and electrical equipment. Background Technology

[0002] In related technologies, a battery includes a casing and a cell. The casing can be an aluminum-plastic film, which includes a nylon layer, an aluminum layer, and a heat-sealing layer. After the aluminum-plastic film is stamped out of the storage cavity, the cell can be encapsulated in the storage cavity.

[0003] Furthermore, battery size usually refers to the size of the casing; however, existing casings typically have fixed dimensions. Therefore, improving battery energy density is a pressing issue that needs to be addressed. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a battery capable of having a high energy density.

[0005] This utility model also proposes an electrical device.

[0006] The battery according to a first aspect embodiment of the present invention includes:

[0007] Battery cell;

[0008] The housing has a storage cavity, in which the battery cell is disposed. The cavity wall of the storage cavity includes a first wall and a second wall. The second wall surrounds the circumferential edge connected to the first wall. The first wall has a first thinning area and a second thinning area on both sides in the thickness direction.

[0009] The battery according to the embodiments of this utility model has at least the following beneficial effects: the first wall of the casing has a first thinning region and a second thinning region, that is, the two sides in the thickness direction of the first wall are thinned, which can effectively reduce the wall thickness of the casing, thereby indirectly increasing the size of the cell. Thus, the battery can have a higher energy density.

[0010] According to some embodiments of the present invention, the battery has a groove in the first thinned area, and the battery cell is located in the groove.

[0011] According to some embodiments of the present invention, the battery has a first wall comprising a first heat-sealing layer, a first metal layer, and a first outer layer stacked together, wherein the first heat-sealing layer surrounds and is connected to the first metal layer, and the first heat-sealing layer and the first metal layer together define the groove.

[0012] According to some embodiments of the present invention, the first wall of the battery includes a first heat-sealing layer, a first metal layer and a first outer layer stacked together, wherein the first heat-sealing layer forms the groove.

[0013] According to some embodiments of the present invention, the second thinning region of the battery includes a first heat-sealing layer, a first metal layer and a first outer layer stacked together, and the second wall includes a second heat-sealing layer, a second metal layer and a second outer layer stacked together, wherein the thickness of the second outer layer is greater than the thickness of the first outer layer.

[0014] According to some embodiments of the present invention, the thickness of the first outer layer is A, the thickness of the second outer layer is B, and 0.75≤A / B≤0.8.

[0015] According to some embodiments of the present invention, the second thinned region of the battery includes a first heat-sealing layer and a first metal layer stacked together, and the second wall includes a second heat-sealing layer, a second metal layer and a second outer layer stacked together.

[0016] According to some embodiments of the present invention, the first wall of the battery is located on one side in the thickness direction of the cell.

[0017] According to some embodiments of the present invention, the second wall of the battery is located on one side in the thickness direction of the cell.

[0018] The electrical equipment according to the second aspect of the present invention includes the battery cell described in any one of the first aspect embodiments.

[0019] The electrical equipment according to the embodiments of the present utility model has at least the following beneficial effects: the batteries in the first aspect embodiments all have high energy density, so the electrical equipment having the battery has good battery life.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0022] Figure 1 This is a schematic diagram of the battery casing in the first embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the battery casing in the second embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the battery casing according to the third embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the battery casing according to the fourth embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the battery casing according to the fifth embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the battery casing in the sixth embodiment of this utility model.

[0028] Figure label:

[0029] Battery 10, casing 100, storage cavity 110, first wall 200, groove 210, first heat-sealing layer 220, first metal layer 230, first outer layer 240, second wall 300, second heat-sealing layer 310, second metal layer 320, second outer layer 330, and battery cell 400. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0033] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0034] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] Please refer to Figures 1 to 4 In some embodiments, the battery 10 includes a cell 400 and a casing 100. The specific structure of the cell 400 is described below. The cell 400 includes a positive electrode, a separator, and a negative electrode. The separator is located between the positive and negative electrode. The positive electrode, separator, and negative electrode are stacked and wound together to form the cell 400. Alternatively, multiple positive and multiple negative electrode sheets are alternately stacked to form the cell 400. The positive electrode includes a positive current collector and a positive active material located on the positive current collector. The negative electrode includes a negative current collector and a negative active material located on the negative current collector.

[0036] The housing 100 has a storage cavity 110, and the material of the housing 100 can be an aluminum-plastic film. The shape of the storage cavity 110 is not specifically limited; for example, it can be a cube, cuboid, or cylinder. Correspondingly, the shape of the battery cell 400 can also be a cube, cuboid, or cylinder. The battery cell 400 is disposed in the storage cavity 110. The cavity wall of the storage cavity 110 includes a first wall 200 and a second wall 300, with the second wall 300 surrounding the circumferential edge connected to the first wall 200. That is, the first wall 200 can be the bottom or top wall of the storage cavity 110, and the second wall 300 can be a side wall of the storage cavity 110. The first wall 200 is located on one side in the thickness direction of the battery cell 400. Alternatively, the second wall 300 is located on one side in the thickness direction of the battery cell 400. The first wall 200 has a first thinning region and a second thinning region on its two sides in the thickness direction, respectively. That is, the first thinning area is provided with a groove 210, and the battery cell 400 is located in the groove 210. Specifically, the battery cell 400 being located in the groove 210 can mean that the cross-sectional area of ​​the groove 210 is larger than the cross-sectional area of ​​the battery cell 400, thus allowing the battery cell 400 to be placed in the groove 210. The battery cell 400 can be bonded to the first wall 200 by adhesive bonding. In the prior art, the first wall 200 does not have a groove 210, but in this application, the battery cell 400 is located in the groove 210, which can improve the energy density of the battery 10. The specific structure of the first wall 200 is described below. The first wall 200 having a second thinning area can be the first wall 200 comprising a first heat-sealing layer 220, a first metal layer 230, and a first outer layer 240 stacked together. The first heat-sealing layer 220 can be a PP layer, the first metal layer 230 can be an aluminum layer, and the first outer layer 240 can be a nylon layer. The thickness of the PP layer can be 20μm~50μm, the thickness of the aluminum layer can be 30μm~50μm, and the thickness of the nylon layer can be 10μm~30μm. The second wall 300 includes a second heat-sealing layer 310, a second metal layer 320, and a second outer layer 330 stacked together. The second heat-sealing layer 310 can be a PP layer, the second metal layer 320 can be an aluminum layer, and the second outer layer 330 can be a nylon layer. The thickness of the second outer layer 330 is greater than the thickness of the first outer layer 240. Specifically, the first wall 200 is provided with a groove 210, and the battery cell 400 is located in the groove 210. The groove 210 can increase the volume of the storage cavity 110. Furthermore, the thickness of the first outer layer 240 is less than the thickness of the second outer layer 330, that is, the first outer layer 240 has been thinned. This can effectively reduce the wall thickness of the housing 100, thereby indirectly increasing the size of the battery cell 400. Thus, with the first wall 200 having both a first thinning region and a second thinning region, the battery 10 can have a high energy density.

[0037] The following describes how the thickness of the second outer layer 330 is greater than that of the first outer layer 240. The thickness of the second outer layer 330 can be the same as that of a conventional nylon layer, and the first outer layer 240 can be thinned using laser ablation. It is conceivable that the grooves 210 on the cavity wall of the storage cavity 110 can also be formed using laser processing. The methods of thinning the first outer layer 240 and creating the grooves 210 can increase the thickness of the battery cell 400 by 40μm to 90μm.

[0038] Specifically, one first wall 200 can be provided. A second wall 300 surrounds the circumferential edge connecting the first wall 200 to form a storage cavity 110. The opening of the storage cavity 110 is then sealed by a third wall, which is left untreated. After providing the first wall 200, the energy density of the battery 10 can be increased. To further increase the energy density of the battery 10, two first walls 200 can be provided. For details, please refer to... Figure 2 In some embodiments, two first walls 200 are provided, with the two first walls 200 located on opposite sides of the cell 400 in the thickness direction. When there are two first walls 200, there are also two grooves 210, with one side of the cell 400 in the thickness direction located in one groove 210 and the other side in the thickness direction located in the other groove 210. That is, the arrangement of two first walls 200 allows the storage cavity 110 to accommodate more cells 400, thereby increasing the energy density of the battery 10.

[0039] Further, please refer to Figure 1 In some embodiments, the thickness of the first outer layer 240 is A, and the thickness of the second outer layer 330 is B, where 0.75 ≤ A / B ≤ 0.8. Here, A / B can be equal to 0.75, 0.76, 0.77, 0.78, 0.79, or 0.8. That is, the thickness of the first outer layer 240 is 75%, 76%, 77%, 78%, 79%, or 80% of the thickness of the second outer layer 330. This allows for increased energy density of the battery 10 while maintaining a certain strength of the casing 100. The thickness of the second outer layer 330 is 50 μm, and the thickness of the first outer layer 240 can be 35 μm or 40 μm. Furthermore, the casing 100 can be an aluminum-plastic film. When punching a groove in the aluminum-plastic film to create the storage cavity 110, the depth of the groove can be less than the original design depth. This effectively avoids wrinkles in the casing 100 caused by excessively deep grooves.

[0040] Furthermore, the specific structure of the groove 210 on the first wall 200 is described below. Please refer to [link / reference]. Figure 1In some embodiments, the first heat-sealing layer 220 surrounds and is connected to the first metal layer 230, and the first heat-sealing layer 220 and the first metal layer 230 together define the groove 210. Specifically, the manufacturing process of the groove 210 may be as follows: after punching a storage cavity 110 out of the housing 100, the middle region of the first heat-sealing layer 220 is thinned by laser to remove the middle part of the first heat-sealing layer 220, leaving only the edge part of the first heat-sealing layer 220 connected to the first metal layer 230. The remaining first heat-sealing layer 220 forms the sidewall of the groove 210, and the first metal layer 230 forms the bottom wall of the groove 210.

[0041] Furthermore, in addition to the methods described above, the groove 210 provided on the first wall 200 can also be provided in other ways; please refer to [reference needed]. Figure 5 In some embodiments, the first heat-sealing layer 220 forms a groove 210. Specifically, the manufacturing process of the groove 210 may involve punching a hole in the storage cavity 110 in the housing 100, and then processing the first heat-sealing layer 220 with a laser. During laser processing, the laser cannot penetrate the first heat-sealing layer 220; the laser only removes a portion of the thickness of the first heat-sealing layer 220, thereby processing the groove 210 on the first heat-sealing layer 220.

[0042] The above-mentioned battery 10 in some embodiments is described. The battery 10 mainly improves its energy density by setting the groove 210 and thinning the first outer layer 240. In addition to thinning, the first outer layer 240 can also be completely removed. For details, please refer to Figure 3 and Figure 4In some embodiments, the battery 10 includes a cell 400 and a casing 100. The specific structure of the cell 400 is described below. The cell 400 includes a positive electrode, a separator, and a negative electrode. The separator is located between the positive and negative electrode. The positive electrode, separator, and negative electrode are stacked and wound together to form the cell 400. Alternatively, multiple positive and multiple negative electrode sheets are alternately stacked to form the cell 400. The positive electrode includes a positive current collector and a positive active material located on the positive current collector. The negative electrode includes a negative current collector and a negative active material located on the negative current collector. The casing 100 has a storage cavity 110, and the casing 100 can be made of aluminum-plastic film. The shape of the storage cavity 110 is not specifically limited; for example, the shape of the storage cavity 110 can be a cube, cuboid, or cylinder. Correspondingly, the shape of the cell 400 can also be a cube, cuboid, or cylinder. The cell 400 is disposed in the storage cavity 110. The cavity wall of the storage cavity 110 includes a first wall 200 and a second wall 300, with the second wall 300 surrounding the circumferential edge connected to the first wall 200. That is, the first wall 200 can be the bottom or top wall of the storage cavity 110, and the second wall 300 can be a side wall of the storage cavity 110. The first wall 200 is located on one side in the thickness direction of the cell 400. A groove 210 is provided in the first thinned area of ​​the first wall 200, and the cell 400 is located in the groove 210. Specifically, the cell 400 is located in the groove 210 such that the cross-sectional area of ​​the groove 210 is larger than the cross-sectional area of ​​the cell 400, allowing the cell 400 to be placed within the groove 210. In the prior art, the first wall 200 does not have a groove 210, while in this application, the cell 400 is located in the groove 210, which can improve the energy density of the battery 10. The specific structure of the first wall 200 is described below. The second thinned area of ​​the first wall 200 includes a first heat-sealing layer 220 and a first metal layer 230 stacked together. The first heat-sealing layer 220 can be a PP layer, and the first metal layer 230 can be an aluminum layer. That is, the first outer layer 240 on the first wall 200 has been removed. The second wall 300 includes a second heat-sealing layer 310, a second metal layer 320, and a second outer layer 330 stacked together. The second heat-sealing layer 310 can be a PP layer, the second metal layer 320 can be an aluminum layer, and the second outer layer 330 can be a nylon layer. Specifically, the first wall 200 of the casing 100 is located on one side of the cell 400 in the thickness direction. The first wall 200 has a groove 210 in which the cell 400 is located. The groove 210 increases the volume of the storage cavity 110. Furthermore, the first wall 200 includes a first heat-sealing layer 220 and a first metal layer 230 stacked together; that is, the first outer layer 240 is removed. This effectively reduces the wall thickness of the casing 100, thereby indirectly increasing the size of the cell 400. Thus, with the combined design of removing the first outer layer 240 and placing the cell 400 in the groove 210, the battery 10 can achieve a higher energy density.

[0043] Specifically, one first wall 200 can be provided. A second wall 300 surrounds the circumferential edge connecting the first wall 200 to form a storage cavity 110. The opening of the storage cavity 110 is then sealed by a third wall, which is left untreated. After providing the first wall 200, the energy density of the battery 10 can be increased. To further increase the energy density of the battery 10, two first walls 200 can be provided. For details, please refer to... Figure 4 In some embodiments, two first walls 200 are provided, with the two first walls 200 located on opposite sides of the cell 400 in the thickness direction. When there are two first walls 200, there are also two grooves 210, with one side of the cell 400 in the thickness direction located in one groove 210 and the other side in the thickness direction located in the other groove 210. That is, the arrangement of two first walls 200 allows the storage cavity 110 to accommodate more cells 400, thereby increasing the energy density of the battery 10.

[0044] Furthermore, the specific structure of the groove 210 on the first wall 200 is described below. Please refer to [link / reference]. Figure 3 In some embodiments, the first heat-sealing layer 220 surrounds and is connected to the first metal layer 230, and the first heat-sealing layer 220 and the first metal layer 230 together define the groove 210. Specifically, the manufacturing process of the groove 210 may be as follows: after punching a storage cavity 110 out of the housing 100, the middle region of the first heat-sealing layer 220 is thinned by laser to remove the middle part of the first heat-sealing layer 220, leaving only the edge part of the first heat-sealing layer 220 connected to the first metal layer 230. The remaining first heat-sealing layer 220 forms the sidewall of the groove 210, and the first metal layer 230 forms the bottom wall of the groove 210.

[0045] Furthermore, in addition to the methods described above, the groove 210 provided on the first wall 200 can also be provided in other ways; please refer to [reference needed]. Figure 6 In some embodiments, the first heat-sealing layer 220 forms a groove 210. Specifically, the manufacturing process of the groove 210 may involve punching a hole in the storage cavity 110 in the housing 100, and then processing the first heat-sealing layer 220 with a laser. During laser processing, the laser cannot penetrate the first heat-sealing layer 220; the laser only removes a portion of the thickness of the first heat-sealing layer 220, thereby processing the groove 210 on the first heat-sealing layer 220.

[0046] In some embodiments, the electrical device includes the battery cell 400 of any of the above embodiments. Specifically, the battery 10 of the above embodiments has a high energy density, thus the electrical device having the battery 10 has a better battery life.

[0047] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A battery, characterized in that, include: Battery cell; The housing has a storage cavity, in which the battery cell is disposed. The cavity wall of the storage cavity includes a first wall and a second wall. The second wall surrounds the circumferential edge connected to the first wall. The first wall has a first thinning area and a second thinning area on both sides in the thickness direction.

2. The battery according to claim 1, characterized in that, The first thinning area is provided with a groove, and the battery cell is located in the groove.

3. The battery according to claim 2, characterized in that, The first wall includes a first heat-sealing layer, a first metal layer and a first outer layer stacked together, the first heat-sealing layer surrounding and connected to the first metal layer, and the first heat-sealing layer and the first metal layer together defining the groove.

4. The battery according to claim 2, characterized in that, The first wall includes a first heat-sealing layer, a first metal layer and a first outer layer stacked together, wherein the first heat-sealing layer forms the groove.

5. The battery according to claim 1, characterized in that, The second thinning area includes a first heat-sealing layer, a first metal layer and a first outer layer stacked together, and the second wall includes a second heat-sealing layer, a second metal layer and a second outer layer stacked together, wherein the thickness of the second outer layer is greater than the thickness of the first outer layer.

6. The battery according to claim 5, characterized in that, The thickness of the first outer layer is A, the thickness of the second outer layer is B, and 0.75≤A / B≤0.

8.

7. The battery according to claim 1, characterized in that, The second thinning zone includes a first heat-sealing layer and a first metal layer stacked together, and the second wall includes a second heat-sealing layer, a second metal layer and a second outer layer stacked together.

8. The battery according to claim 1, characterized in that, The first wall is located on one side in the thickness direction of the battery cell.

9. The battery according to claim 1, characterized in that, The second wall is located on one side in the thickness direction of the battery cell.

10. Electrical equipment, characterized in that, The battery cell includes any one of claims 1 to 9.

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