Battery and electric device

Abstract

The utility model discloses a kind of battery and electric 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 first wall is located in the thickness direction of the battery core one side, the first wall includes the first heat-seal layer and first metal layer of laminated arrangement, the second wall includes the second heat-seal layer, second metal layer and first outer layer of laminated arrangement.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 a circumferential edge connected to the first wall. The first wall includes a first heat-sealing layer and a first metal layer stacked together. The second wall includes a second heat-sealing layer and a second metal layer stacked together.

[0009] The battery according to the embodiments of this utility model has at least the following beneficial effects: the first wall includes a first heat-sealing layer and a first metal layer stacked together. In the prior art, the cavity wall of the storage cavity includes a heat-sealing layer, a metal layer, and an outer layer. However, in this application, the first wall only includes a first heat-sealing layer and a first metal layer. This can improve the energy density of the battery. That is, by reducing the wall thickness of the casing and increasing the size of the cell, the energy density of the battery can be improved. Specifically, the battery can have a high energy density.

[0010] According to some embodiments of the present invention, the second wall of the battery further includes a first outer layer, and the second heat-sealing layer, the second metal layer and the first outer layer are stacked in sequence.

[0011] 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.

[0012] According to some embodiments of the present invention, the battery has two first walls, which are respectively located on both sides in the thickness direction of the battery cell.

[0013] 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.

[0014] The battery according to a second aspect embodiment of the present invention includes:

[0015] Battery cell;

[0016] 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 includes a first heat-sealing layer, a first metal layer and a second outer layer stacked together. The second wall includes a second heat-sealing layer, a second metal layer and a first outer layer stacked together. The thickness of the second outer layer is less than the thickness of the first outer layer.

[0017] The battery according to the embodiments of this utility model has at least the following beneficial effects: the first wall includes a first heat-sealing layer, a first metal layer, and a second outer layer stacked together. The thickness of the second outer layer is less than the thickness of the first outer layer, that is, the thickness of the second outer layer has been thinned. In the prior art, the cavity wall of the storage chamber includes a heat-sealing layer, a metal layer, and an outer layer, and the thickness of the outer layer has not been thinned. However, in this application, after the second outer layer is thinned, the wall thickness of the casing can be reduced, the size of the cell can be increased, and thus the energy density of the battery can be improved. Specifically, the battery can have a higher energy density.

[0018] 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.

[0019] According to some embodiments of the present invention, the battery has two first walls, which are respectively located on both sides in the thickness direction of the battery cell.

[0020] 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.

[0021] The electrical device according to the third aspect of the present invention includes the battery cell described in any one of the first and second aspect embodiments.

[0022] The electrical equipment according to the embodiments of the present utility model has at least the following beneficial effects: the energy density of the battery in the first aspect embodiment and the battery in the second aspect embodiment are both high, so the electrical equipment having the battery has a better battery life.

[0023] 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

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0025] Figure 1 This is a schematic diagram of the battery casing in the first embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the battery casing in the second embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the battery casing according to the third embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the battery casing in the fourth embodiment of the present invention.

[0029] Figure label:

[0030] The shell 100, storage cavity 110, first wall 200, first heat-sealing layer 210, first metal layer 220, second outer layer 230, second wall 300, second heat-sealing layer 310, second metal layer 320, and first outer layer 330. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Please refer to Figure 1 and Figure 2In some embodiments, the battery includes a cell (not shown) and a casing 100. The cell includes a positive electrode and a negative electrode. The cell can be a wound structure; specifically, the positive and negative electrode sheets are stacked and then wound to form a wound structure. Alternatively, the cell can be a stacked structure, with multiple positive and multiple negative electrode sheets alternately stacked to form a stacked structure. The casing 100 has a storage cavity 110, and the casing 100 can be an aluminum-plastic film. The cell is disposed in the storage cavity 110. The shape of the storage cavity 110 can be adapted to the shape of the cell. For example, the storage cavity 110 can be a cube, and the cell can also be a cube; the storage cavity 110 can be a cuboid, and the cell can also be a cuboid; the storage cavity 110 can be a cylinder, and the cell can also be a cylinder. The cavity wall of the storage cavity 110 includes a first wall 200 and a second wall 300. The second wall 300 surrounds the circumferential edge connected to the first wall 200. That is, after the second wall 300 surrounds the circumferential edge connected to the first wall 200, the first wall 200 and the second wall 300 together form the storage cavity 110. Further, the storage cavity 110 can be formed by stamping on the housing 100, or by stamping two half-cavities on the housing 100 and then merging the two half-cavities into the storage cavity 110. The first wall 200 is located on one side in the thickness direction of the battery cell, or the second wall 300 is located on one side in the thickness direction of the battery cell. The specific structure of the first wall 200 is described below. The first wall 200 includes a first heat-sealing layer 210 and a first metal layer 220 stacked together. That is, the inner surface of the first wall 200 is the first heat-sealing layer 210, the outer surface of the first wall 200 is the first metal layer 220, and the outer surface of the first wall 200 is also the outer surface of the housing 100. The second wall 300 has the following specific structure: it includes a second heat-sealing layer 310, a second metal layer 320, and a first outer layer 330 stacked together. That is, the inner surface of the second wall 300 is the second heat-sealing layer 310, the outer surface of the second wall 300 is the first outer layer 330, and the outer surface of the second wall 300 is also the outer surface of the housing 100. Alternatively, the second wall 300 includes a second heat-sealing layer 310 and a second metal layer 320 stacked together. Both the first heat-sealing layer 210 and the second heat-sealing layer 310 can be PP layers, both the first metal layer 220 and the second metal layer 320 can be aluminum layers, and the first outer layer 330 can be a nylon layer. The thickness of the first wall 200 is less than or equal to the thickness of the second wall 300. Specifically, the first wall 200 of the casing 100 is located on one side in the thickness direction of the battery cell. The first wall 200 includes a first heat-sealing layer 210 and a first metal layer 220 stacked together. In the prior art, the cavity wall of the storage chamber 110 includes a heat-sealing layer, a metal layer, and an outer layer. However, in this application, the first wall 200 only includes the first heat-sealing layer 210 and the first metal layer 220, and the second wall 300 only includes a second heat-sealing layer 310 and a second metal layer 320. This improves the energy density of the battery.In other words, by reducing the wall thickness of the casing 100 and increasing the size of the cell, the energy density of the battery can be improved. Specifically, the battery can have a higher energy density.

[0037] Continuing the explanation, the first wall 200 is located on one side of the cell's thickness direction. Since the first wall 200 lacks a nylon layer, this indirectly increases the cell's dimensions in the thickness direction, thereby improving the battery's energy density. It's conceivable that the area of ​​the first wall 200 can be the same as the cross-sectional area of ​​the cell in the thickness direction. The aluminum-plastic film removes the nylon layer from the first wall 200, but leaves the nylon layer in other locations intact. In some cases, after the nylon layer is removed, a groove will be formed on the outer surface of the casing 100. However, because the casing 100 has a certain degree of extensibility, the cell can compress the casing 100, effectively ensuring good flatness of the casing 100.

[0038] Further, 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 thickness direction. In this embodiment, by removing the second outer layer 230 from the two first walls 200, the battery size in the thickness direction can be further increased. For example, the thickness of the second outer layer 230 is typically 20 μm; removing the second outer layer 230 from the two first walls 200 can increase the cell thickness by 40 μm, thereby increasing the battery's energy density. Furthermore, in other embodiments, the cavity wall of the storage chamber 110 also includes a third wall, which is opposite to the first wall 200. The circumferential edge of the third wall is connected to the second wall 300. The third wall includes a first heat-sealing layer 210, a first metal layer 220, and a nylon layer stacked together.

[0039] Furthermore, in some embodiments, the battery also includes an adhesive component, with its two sides respectively bonded to the first heat-sealing layer 210 and the battery cell. The adhesive component can be double-sided tape or hot melt adhesive. After the two sides of the adhesive component are bonded to the first heat-sealing layer 210 and the battery cell, the adhesive component can fix the battery cell in place, effectively preventing the battery cell from sliding and being damaged within the storage cavity 110.

[0040] Furthermore, in some embodiments, the thickness of the first heat-sealing layer 210 is A, where 20μm ≤ A ≤ 50μm. The first heat-sealing layer 210 can be a PP layer, and its thickness can be 20μm, 21μm, 22μm, 23μm, 24μm, 25μm, 26μm, 27μm, 28μm, 29μm, 30μm, 32μm, 34μm, 36μm, 38μm, 40μm, 42μm, 44μm, 46μm, 48μm, or 50μm. The first heat-sealing layer 210 can block electrolyte penetration and prevent corrosion of the first metal layer 220. When the thickness of the first heat-sealing layer 210 is large, such as greater than 50μm, this will result in lower flexibility of the first heat-sealing layer 210 and higher battery cost. When the thickness of the first heat-sealing layer 210 is small, such as when the thickness of the first heat-sealing layer 210 is less than 20μm, it will lead to insufficient heat-sealing strength, resulting in seal failure, electrolyte leakage, and inability to effectively block the electrolyte. The aluminum layer may be corroded and perforated.

[0041] Furthermore, in some embodiments, the thickness of the first metal layer 220 is B, where 30μm ≤ B ≤ 50μm. Specifically, the first metal layer 220 can be an aluminum layer, and its thickness can be 30μm, 31μm, 32μm, 33μm, 34μm, 35μm, 36μm, 37μm, 38μm, 39μm, 40μm, 41μm, 42μm, 43μm, 44μm, 45μm, 46μm, 47μm, 48μm, 49μm, or 50μm. The first metal layer 220 serves two purposes: firstly, it prevents moisture and oxygen penetration, protecting the internal structure of the battery; secondly, it possesses high mechanical strength, supporting the strength of the casing 100. When the thickness of the first metal layer 220 is large, such as greater than 50μm, this leads to a higher battery cost. When the thickness of the first metal layer 220 is small, such as when the thickness of the first metal layer 220 is less than 30μm, this will result in insufficient barrier performance and mechanical strength of the first metal layer 220.

[0042] Furthermore, in some embodiments, the thickness of the first outer layer 330 is C, where 10 μm ≤ C ≤ 30 μm. The first outer layer 330 can be a nylon layer, providing puncture and tear resistance. The thickness of the first outer layer 330 can be 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, or 30 μm. When the thickness of the first outer layer 330 is large, such as greater than 30 μm, it leads to material waste and higher battery costs. When the thickness of the first outer layer 330 is small, such as when the thickness of the first outer layer 330 is less than 10μm, this will result in insufficient puncture resistance of the first outer layer 330.

[0043] As mentioned above, removing all the nylon layers on the first wall 200 and the second wall 300 can improve the energy density of the battery. Besides removing all the nylon layers on the first wall 200 and the second wall 300, partially removing the nylon layers can also improve the battery's energy density. In other words, this application mainly improves the nylon layer to increase the battery's energy density by completely removing or thinning the nylon layer. For details, please refer to... Figure 3 and Figure 4In some embodiments, the battery includes a cell and a casing 100. The cell includes a positive electrode and a negative electrode. The cell can be a wound structure; specifically, the positive and negative electrode sheets are stacked and then wound to form a wound structure. Alternatively, the cell can be a stacked structure, with multiple positive and negative electrode sheets alternately stacked to form a stacked structure. The casing 100 has a storage cavity 110, and the casing 100 can be an aluminum-plastic film. The cell is disposed in the storage cavity 110. The shape of the storage cavity 110 can be adapted to the shape of the cell. For example, the storage cavity 110 can be a cube, and the cell can also be a cube; the storage cavity 110 can be a cuboid, and the cell can also be a cuboid; the storage cavity 110 can be a cylinder, and the cell can also be a cylinder. The cavity wall of the storage cavity 110 includes a first wall 200 and a second wall 300. The second wall 300 surrounds the circumferential edge connected to the first wall 200. That is, after the second wall 300 surrounds the circumferential edge connected to the first wall 200, the first wall 200 and the second wall 300 together form the storage cavity 110. Further, the storage cavity 110 can be formed by stamping on the housing 100, or by stamping two half-cavities on the housing 100 and then merging the two half-cavities into the storage cavity 110. The first wall 200 is located on one side in the thickness direction of the battery cell, or the second wall 300 is located on one side in the thickness direction of the battery cell. The specific structure of the first wall 200 is described below. The first wall 200 includes a first heat-sealing layer 210, a first metal layer 220 and a second outer layer 230 stacked together. That is, the inner surface of the first wall 200 is the first heat-sealing layer 210, the outer surface of the first wall 200 is the second outer layer 230, and the outer surface of the first wall 200 is also the outer surface of the housing 100. The second wall 300 has the following specific structure: it includes a second heat-sealing layer 310, a second metal layer 320, and a first outer layer 330 stacked together. Specifically, the inner surface of the second wall 300 is the second heat-sealing layer 310, and the outer surface of the second wall 300 is the first outer layer 330. The outer surface of the second wall 300 is also the outer surface of the housing 100. Both the first heat-sealing layer 210 and the second heat-sealing layer 310 can be PP layers, both the first metal layer 220 and the second metal layer 320 can be aluminum layers, and both the first outer layer 330 and the second outer layer 230 can be nylon layers. The thickness of the second outer layer 230 is less than the thickness of the first outer layer 330. The thickness of the first wall 200 is less than the thickness of the second wall 300.Specifically, the first wall 200 of the casing 100 is located on one side in the thickness direction of the battery cell. The first wall 200 includes a first heat-sealing layer 210, a first metal layer 220, and a second outer layer 230 stacked together. The thickness of the second outer layer 230 is less than the thickness of the first outer layer 230; that is, the thickness of the second outer layer 230 has been thinned. In the prior art, the cavity wall of the storage chamber 110 includes a heat-sealing layer, a metal layer, and an outer layer, and the outer layer is not thinned. However, in this application, after the second outer layer 230 is thinned, the wall thickness of the casing 100 can be reduced, increasing the size of the battery cell and thus improving the energy density of the battery. Specifically, the battery can have a higher energy density. It should be noted that the thickness of the first outer layer 330 can also be thinned.

[0044] Further, 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 thickness direction. In this embodiment, by removing the second outer layer 230 from the two first walls 200, the battery size in the thickness direction can be further increased. For example, the thickness of the second outer layer 230 is typically 20 μm; removing the second outer layer 230 from the two first walls 200 can increase the cell thickness by 40 μm, thereby increasing the battery's energy density. Furthermore, in other embodiments, the cavity wall of the storage chamber 110 also includes a third wall, which is opposite to the first wall 200. The circumferential edge of the third wall is connected to the second wall 300. The third wall includes a first heat-sealing layer 210, a first metal layer 220, and a nylon layer stacked together.

[0045] Furthermore, in some embodiments, the battery further includes an adhesive component, with both sides of the adhesive component bonded to the first heat-sealing layer 210 and the battery cell, respectively. The adhesive component can be double-sided tape or hot melt adhesive. After the two sides of the adhesive component are bonded to the first heat-sealing layer 210 and the battery cell, the adhesive component can fix the battery cell in place, effectively preventing the battery cell from sliding and being damaged within the storage cavity 110.

[0046] In some embodiments, the electrical device includes a battery cell from any of the above embodiments. Specifically, the batteries in the above embodiments all have high energy density, thus the electrical device having the battery has good 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 a circumferential edge connected to the first wall. The first wall includes a first heat-sealing layer and a first metal layer stacked together. The second wall includes a second heat-sealing layer and a second metal layer stacked together.

2. The battery according to claim 1, characterized in that, The second wall also includes a first outer layer, and the second heat-sealing layer, the second metal layer and the first outer layer are stacked in sequence.

3. The battery according to claim 2, characterized in that, The first wall is located on one side in the thickness direction of the battery cell.

4. The battery according to claim 3, characterized in that, There are two first walls, which are located on opposite sides of the cell thickness direction.

5. The battery according to claim 2, characterized in that, The second wall is located on one side in the thickness direction of the battery cell.

6. 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 includes a first heat-sealing layer, a first metal layer and a second outer layer stacked together. The second wall includes a second heat-sealing layer, a second metal layer and a first outer layer stacked together. The thickness of the second outer layer is less than the thickness of the first outer layer.

7. The battery according to claim 6, characterized in that, The first wall is located on one side in the thickness direction of the battery cell.

8. The battery according to claim 7, characterized in that, There are two first walls, which are located on opposite sides of the cell thickness direction.

9. The battery according to claim 6, 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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