Housing, battery, and electronic device

Abstract

The utility model discloses a shell, a battery and electronic equipment. The shell comprises a cover plate, a bottom shell and a connecting structure, the bottom shell is provided with a containing groove and an opening communicated with the containing groove; one end of the connecting structure is connected to the opening of the bottom shell, the other end of the connecting structure is connected to the cover plate, and a sealed accommodating cavity is defined by the connecting structure, the cover plate and the bottom shell; the connecting structure is an elastic structure and can be stressed to deform in the first direction, and the first direction is the direction in which the cover plate and the bottom shell face each other. Therefore, when the shell disclosed by the embodiment is used for the battery and the battery cell expands to a certain extent, the connecting structure can correspondingly deform to a certain extent, so that the extrusion on the welding part of the cover plate and the bottom shell is reduced, and the risk that the welding part of the cover plate and the bottom shell is broken is reduced. Therefore, compared with the traditional technology, the cover plate in the embodiment does not need to be thickened or thinned, so that the battery has high energy density while having enough connection strength.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a housing, a battery and an electronic device. Background Art

[0002] A battery typically includes an outer shell and a cell. The outer shell includes a bottom shell and a cover plate. The bottom shell is welded to the cover plate to form a housing, and the cell is disposed within the housing. After use, the cell will expand to a certain extent, squeezing the outer shell. To prevent damage to the weld between the cover plate and the bottom shell during squeezing, there are two common approaches in the prior art. One approach is to reduce the thickness of the cover plate, thereby reducing its rigidity so that it has a certain degree of deformation capacity to buffer against squeezing. However, thinning the cover plate will correspondingly reduce the weld strength of the cover plate, which in turn will reduce the connection strength between the cover plate and the bottom shell. The other approach is to increase the thickness of the cover plate, thereby increasing the connection strength between the cover plate and the bottom shell. However, thickening the cover plate will reduce the energy density of the battery. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides a housing that can be used for a battery so that the battery has sufficient connection strength and high energy density.

[0004] The utility model also provides a battery comprising the above-mentioned shell.

[0005] The housing according to the first embodiment of the present invention includes: a cover plate, a bottom shell and a connecting structure.

[0006] The bottom shell has a receiving groove and an opening connected to the receiving groove; the connecting structure is arranged around the opening, one end of which is connected to the opening of the bottom shell, and the other end is connected to the cover plate, and together with the cover plate and the bottom shell, defines a sealed receiving cavity; wherein, the connecting structure is an elastic structure, and the connecting structure can be deformed along a first direction under force, and the first direction is the direction in which the cover plate and the bottom shell face each other.

[0007] The housing according to the embodiment of the present invention has at least the following beneficial effects:

[0008] The outer shell includes an elastic connection structure, which is connected between the bottom shell and the cover plate, thereby allowing the cover plate to move relative to the bottom shell. Therefore, when the outer shell of this embodiment is used for a battery, the battery cell is arranged in the accommodating cavity of the outer shell. When the battery cell expands to a certain extent, the connection structure can correspondingly deform to a certain extent, thereby reducing the squeeze on the weld between the cover plate and the bottom shell, thereby reducing the risk of rupture at the weld between the cover plate and the bottom shell. Similarly, when the battery is hit, the connection structure deforms, thereby reducing the impact on the weld between the cover plate and the bottom shell, thereby reducing the risk of rupture at the weld between the cover plate and the bottom shell. It can be seen that compared with traditional technologies, the cover plate in this embodiment does not need to be thickened or thinned, so that the battery has sufficient connection strength while having a higher energy density.

[0009] According to some embodiments of the present invention, the connecting structure includes a first connecting part and a second connecting part, the first connecting part is connected to the opening and protrudes outward from the bottom shell, one end of the second connecting part is connected to the side of the first connecting part away from the opening, and the other end is connected to the cover plate.

[0010] According to some embodiments of the present invention, the first connecting portion and the bottom shell are an integrated structure formed by stamping.

[0011] According to some embodiments of the present invention, along the first direction, the size of the cover plate is smaller than the size of the first connecting portion, the second connecting portion and the cover plate are a cover body of an integral structure formed by stamping, the second connecting portion is welded to the first connecting portion, and the formed weld structure passes through the cover plate and the second connecting portion.

[0012] According to some embodiments of the present invention, along the first direction, the size of the cover plate is larger than the size of the first connecting part, the first connecting part and the second connecting part are a shell of an integral structure formed by stamping, the second connecting part is welded to the cover plate, and the formed weld structure passes through the first connecting part and the second connecting part.

[0013] According to some embodiments of the present invention, along the first direction, the size of the cover plate is equal to the size of the first connecting portion, the first connecting portion includes a first connecting segment and a second connecting segment, the first connecting segment, the first connecting portion and the bottom shell are a shell of an integral structure formed by stamping, the second connecting segment and the cover plate are a cover body of an integral structure formed by stamping, the first connecting segment is welded to the second connecting segment, and the formed weld structure runs through the cover body and the shell.

[0014] According to some embodiments of the present invention, along the first direction, a size of the second connecting portion is L1, 0<L1≤200 μm.

[0015] According to some embodiments of the present invention, a dimension of the first connection portion protruding outward from the bottom shell is L2, 50 μm≤L2≤1000 μm.

[0016] The battery according to the second embodiment of the present invention includes: a battery cell and the shell implemented in the first aspect, wherein the battery cell is arranged in the accommodating cavity of the shell.

[0017] The battery according to the embodiment of the present utility model has at least the following beneficial effects:

[0018] The shell described in the embodiment of the first aspect is adopted, and the shell includes an elastic connection structure, which is connected between the bottom shell and the cover plate, thereby allowing the cover plate to move relative to the bottom shell. Therefore, when the battery cell expands to a certain extent, the connection structure can correspondingly deform to a certain extent, thereby reducing the squeeze on the weld between the cover plate and the bottom shell, thereby reducing the risk of rupture at the weld between the cover plate and the bottom shell. Similarly, when the battery is impacted, the connection structure deforms, thereby reducing the impact on the weld between the cover plate and the bottom shell, thereby reducing the risk of rupture at the weld between the cover plate and the bottom shell. It can be seen that compared with traditional technologies, the cover plate in this embodiment does not need to be thickened or thinned, so that the battery of this embodiment has sufficient connection strength while having a higher energy density.

[0019] An electronic device according to an embodiment of the third aspect of the present invention includes the battery of the embodiment of the second aspect.

[0020] The electronic device according to the embodiment of the present utility model has at least the following beneficial effects:

[0021] In a battery using an embodiment of the second aspect, the battery housing includes an elastic connection structure connected between the bottom shell and the cover plate, thereby enabling the cover plate to move relative to the bottom shell. Therefore, when the battery cell expands to a certain extent, the connection structure can correspondingly deform to a certain extent, thereby reducing the pressure on the weld between the cover plate and the bottom shell, thereby reducing the risk of rupture at the weld between the cover plate and the bottom shell. Similarly, when the battery is impacted, the connection structure deforms, thereby reducing the impact on the weld between the cover plate and the bottom shell, thereby reducing the risk of the weld between the cover plate and the bottom shell, thereby increasing the service life of the electronic device.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1A cross-sectional view of the structure of the housing of the embodiment of the first aspect of the present utility model;

[0025] Figure 2 for Figure 1 Magnified view of area A in the middle;

[0026] Figure 3 A partial cross-sectional view of the structure of the second housing of the embodiment of the first aspect of the present utility model;

[0027] Figure 4 This is a partial cross-sectional view of the structure of the third shell of the embodiment of the first aspect of the present utility model.

[0028] Reference numerals:

[0029] Cover 10, housing 20;

[0030] Cover plate 100;

[0031] Bottom shell 200, receiving groove 210, opening 220;

[0032] Connecting structure 300, first connecting portion 310, second connecting portion 320, first connecting section 321, second connecting section 322;

[0033] Accommodating cavity 400 and welding seam structure 500 . DETAILED DESCRIPTION

[0034] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0035] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0036] In the description of this utility model, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of the terms "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0037] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0038] A battery typically includes an outer shell and a cell. The outer shell includes a bottom shell and a cover plate. The bottom shell is welded to the cover plate to form a housing, and the cell is disposed within the housing. After use, the cell will expand to a certain extent, squeezing the outer shell. To prevent damage to the weld between the cover plate and the bottom shell during squeezing, there are two common approaches in the prior art. One approach is to reduce the thickness of the cover plate, thereby reducing its rigidity so that it has a certain degree of deformation capacity to buffer against squeezing. However, thinning the cover plate will correspondingly reduce the weld strength of the cover plate, which in turn will reduce the connection strength between the cover plate and the bottom shell. The other approach is to increase the thickness of the cover plate, thereby increasing the connection strength between the cover plate and the bottom shell. However, thickening the cover plate will reduce the energy density of the battery.

[0039] Based on the above problems, this application proposes a shell that can be used for batteries, so that the batteries have sufficient connection strength and high energy density. The batteries of this embodiment include but are not limited to square batteries, cylindrical batteries or steel-shell batteries. This embodiment takes steel-shell batteries as an example for explanation. Figure 1 and Figure 2 , Figure 1 This is a cross-sectional view of the structure of the housing of the first embodiment of the utility model. Figure 2 for Figure 1 The enlarged view of area A in the middle shows that the battery of this embodiment includes: a cover plate 100 , a bottom shell 200 and a connecting structure 300 .

[0040] The bottom shell 200 has a receiving groove 210 and an opening 220 connected to the receiving groove 210. The connecting structure 300 is arranged around the opening 220. One end of the connecting structure 300 is connected to the opening 220 of the bottom shell 200, and the other end is connected to the cover plate 100. Together with the cover plate 100 and the bottom shell 200, the connecting structure 300 defines a sealed receiving chamber 400. The receiving chamber 400 is used to accommodate electrolyte and battery cells. The connecting structure 300 is an elastic structure. The connecting structure 300 can be deformed in a first direction under load. The first direction is the direction in which the cover plate 100 and the bottom shell 200 face each other. Exemplarily, the connecting structure 300 is configured to extend along the first direction and have a bent portion structure. The bent portion is, for example, an S-shaped structure, a Z-shaped structure, or a V-shaped structure. As long as the rigidity of the shell along the first direction can be reduced, so that when the shell is subjected to force, it can play a certain buffering role, thereby reducing the force on the weld structure between the cover plate 100 and the bottom shell 200. In some embodiments, the connecting structure 300 includes a first connecting portion 310 and a second connecting portion 320. The first connecting portion 310 is connected to the opening 220 and protrudes outward from the bottom housing 200. For example, the angle between the first connecting portion 310 and the first direction is 80°, 90°, or 100°. One end of the second connecting portion 320 is connected to the side of the first connecting portion 310 away from the opening 220, and the other end is connected to the cover plate 100. That is, the second connecting portion 320 is connected to the position where the first connecting portion 310 has the greatest deflection. This makes it easier for the first connecting portion 310 to deform when the cover plate 100 or the bottom housing 200 is subjected to force, thereby improving the buffering capacity of the first connecting portion 310. Specifically, in this embodiment, the housing includes an elastic connecting structure 300 that can deform along the first direction under force. The connecting structure 300 is connected between the bottom housing 200 and the cover plate 100, thereby enabling the cover plate 100 to move relative to the bottom housing 200. Therefore, when the housing of this embodiment is used in a battery, when the battery cell expands to a certain extent, the connection structure 300 can correspondingly deform to a certain extent, reducing the pressure on the weld between the battery cell cover plate 100 and the bottom shell 200, thereby reducing the risk of cracking at the weld between the cover plate 100 and the bottom shell 200. Similarly, when the battery is impacted, the connection structure 300 deforms, thereby reducing the impact on the weld between the cover plate 100 and the bottom shell 200, thereby reducing the risk of cracking at the weld between the cover plate 100 and the bottom shell 200. Therefore, compared with traditional technologies, the cover plate 100 of this embodiment does not need to be thickened or thinned, thereby ensuring that the battery has sufficient connection strength while also having a high energy density.

[0041] Furthermore, because the cover plate 100 can move toward the bottom case 200, when the housing of this embodiment is used for a battery, the size of the battery along the first direction can be adjusted, thereby improving the practicality of the battery. Specifically, during installation, a force can be first applied to the cover plate 100 toward the bottom case 200 to deform the connection structure 300 of the cover plate 100 toward the bottom case 200, thereby reducing the size of the housing along the first direction (such as the thickness of a steel-cased battery), allowing the battery to be installed in a smaller electronic device.

[0042] Reference Figures 2 to 4 , Figure 3 This is a partial cross-sectional view of the structure of the second housing of the embodiment of the first aspect of the present utility model. Figure 4 This is a partial cross-sectional view of the structure of the third housing of the first embodiment of the present invention. The connection structure 300 can be an integrated structure or a split structure, that is, the first connection part 310 and the second connection part 320 can be a split structure or an integrated structure. For example, in some embodiments, the first connection part 310 and the bottom shell 200 are an integrated structure formed by stamping (such as Figure 2 As shown), without the need for welding. This makes the shell processing of this embodiment simpler. Specifically, in the prior art, the shell of the battery is usually processed by a stamping process to improve the dimensional accuracy and consistency of the battery. Based on this, in this embodiment, the first connecting part 310 and the bottom shell 200 are stamped from the same piece of plate to form a shell 20 of an integrated structure, without the need to introduce other processing techniques, which not only improves processing efficiency but also reduces processing costs. Similarly, in some embodiments, the second connecting part 320 and the first connecting part 310 are an integrated structure, that is, the bottom shell 200 and the connecting structure 300 are connected to form a shell 20 of an integrated structure, or the second connecting part 320 and the cover plate 100 are a cover body 10 of an integrated structure.

[0043] For example, in some embodiments, along the first direction, the size of the cover plate 100 is smaller than the size of the first connecting portion 310, and the second connecting portion 320 and the cover plate 100 are a cover body 10 of an integral structure formed by stamping (such as Figure 2(As described above), the second connecting portion 320 is welded to the first connecting portion 310, and the resulting weld structure 500 (the structure formed after the molten pool solidifies) penetrates the cover plate 100 and the second connecting portion 320. That is, during the welding process, the cover plate 100 is welded to the bottom shell 200, and the molten pool penetrates the cover plate 100 and the second connecting portion 320, thereby increasing the connection area between the weld structure 500 and the cover body 10, thereby improving the connection strength between the cover body 10 and the housing 20. It should be noted that the fact that the weld structure 500 penetrates the first connecting portion 310 in the accompanying drawings is not the only limitation of this embodiment. The depth of the weld structure 500 into the first connecting portion 310 can be 50%, 60%, or 90%, which is determined based on the actual size of the first connecting portion 310 and welding requirements.

[0044] Similarly, in some embodiments, along the first direction, the size of the cover plate 100 is larger than the size of the first connecting portion 310, and the first connecting portion 310 and the second connecting portion 320 are an integral structure formed by stamping, that is, the first connecting portion 310, the second connecting portion 320 and the bottom shell 200 are an integral shell 20 formed by stamping, and the second connecting portion 320 is welded to the cover plate 100, and the formed weld structure 500 passes through the first connecting portion 310 and the second connecting portion 320. Or in some embodiments, along the first direction, the size of the cover plate 100 is equal to the size of the first connecting portion 310, the first connecting portion 310 includes a first connecting segment 321 and a second connecting segment 322, the first connecting segment 321 and the first connecting portion 310 are an integral structure formed by stamping, that is, the first connecting segment 321, the first connecting portion 310 and the bottom shell 200 are an integral shell 20 formed by stamping, the second connecting segment 322 and the cover plate 100 are an integral structure cover body 10 formed by stamping, the first connecting segment 321 is welded to the second connecting segment 322, and the weld structure 500 runs through the cover body 10 and the shell 20, which will not be repeated here.

[0045] In some embodiments, along the first direction, the dimension of the second connection portion 320 is L1, where 100 μm < L1 ≤ 200 μm. Specifically, it is understood that the dimension L1 of the second connection portion 320 determines the distance the cover 10 can move toward the housing 20. Specifically, for example, when the first connection portion 310 is flush with the first opening 220, that is, the angle between the first connection portion 310 and the first direction is 90°, the gap between the cover plate 100 and the bottom shell 200 is L1, and the maximum distance the cover plate 100 can move toward the housing 20 is L1. When the first connection portion 310 protrudes from the first opening 220 toward the cover plate 100 by a protruding distance L3, the gap between the cover plate 100 and the bottom shell 200 is L1 + L3, and the maximum distance the cover plate 100 can move toward the bottom shell 200 is L1 + L3. The larger the gap between the cover plate 100 and the bottom shell 200, the greater the buffering effect of the connection structure 300. However, if L1 is too large, the rigidity of the second connection portion 320 will be reduced, causing the end of the second connection portion 320 facing away from the cover plate 100 to easily deviate, resulting in the weld structure 500 being subjected to a large tangential force at the location where the second connection portion 320 connects to the first connection portion 310. When the tangential force applied to the weld structure 500 is too large, it is easy to cause the weld structure 500 to break, that is, cracks will appear between the cover body 10 and the shell 20, causing battery leakage. Based on this, in this embodiment, the size of the second connection portion 320 is set within an appropriate range so that the connection structure 300 can provide sufficient buffering while protecting the weld structure 500 from large tangential forces, thereby improving battery reliability.

[0046] In some embodiments, the dimension L2 of the first connection portion 310 protruding outward from the housing 20 is 50 μm ≤ L2 ≤ 1000 μm. Specifically, it can be understood that the larger L2 is, the smaller the rigidity of the first connection portion 310 is, that is, the better the buffering effect of the connection structure 300 is. However, if L2 is too large, the first connection structure 300 will occupy too much space, resulting in a reduction in the energy density of the battery. Based on this, this embodiment sets L2 within an appropriate range so that the connection structure 300 can provide sufficient buffering while ensuring a high energy density of the battery.

[0047] A battery according to an embodiment of the second aspect of the present invention comprises: a battery cell and a housing according to the first aspect, wherein the battery cell is disposed within a receiving cavity 400 of the housing. The housing includes an elastic connecting structure 300, which is connected between the bottom housing 200 and the cover plate 100, thereby enabling the cover plate 100 to move relative to the bottom housing 200. Therefore, when the housing of this embodiment is used in a battery, the battery cell is disposed within the receiving cavity 400 of the housing. When the battery cell expands to a certain extent, the connecting structure 300 can correspondingly deform to reduce the compression on the weld between the cover plate 100 and the bottom housing 200, thereby reducing the risk of rupture at the weld between the cover plate 100 and the bottom housing 200. Similarly, when the battery is impacted, the connection structure 300 is deformed, thereby reducing the impact on the welding point between the cover plate 100 and the bottom shell 200, thereby reducing the risk of welding between the cover plate 100 and the bottom shell 200. It can be seen that compared with traditional technology, the cover plate 100 in this embodiment does not need to be thickened or thinned, so that the battery of this embodiment has sufficient connection strength and higher energy density.

[0048] It should be noted that since this embodiment adopts all the technical features of the first aspect embodiment, this embodiment has all the technical effects brought by the first aspect embodiment, which will not be repeated here.

[0049] According to the third embodiment of the present invention, the battery includes the battery of the second embodiment. The outer shell of the battery includes an elastic connection structure 300, which is connected between the bottom shell 200 and the cover plate 100, thereby allowing the cover plate 100 to move relative to the bottom shell 200. Therefore, when the battery cell expands to a certain extent, the connection structure 300 can correspondingly deform to a certain extent, thereby reducing the extrusion on the weld between the cover plate 100 and the bottom shell 200, thereby reducing the risk of rupture at the weld between the cover plate 100 and the bottom shell 200. Similarly, when the battery is impacted, the connection structure 300 deforms, thereby reducing the impact on the weld between the cover plate 100 and the bottom shell 200, thereby reducing the risk of rupture at the weld between the cover plate 100 and the bottom shell 200, thereby improving the service life of the electronic device.

[0050] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, in the description of the present invention, the reference terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" are intended to mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in an appropriate manner in any one or more embodiments or examples.

Claims

1. A housing, characterized in that include: cover; A bottom shell having a receiving groove and an opening communicating with the receiving groove; a connecting structure, disposed around the opening, with one end connected to the opening of the bottom shell and the other end connected to the cover plate, and defining a sealed accommodating cavity together with the cover plate and the bottom shell; The connection structure is an elastic structure, and the connection structure can be deformed along a first direction under force, and the first direction is the direction in which the cover plate and the bottom shell face each other.

2. The housing according to claim 1, wherein The connecting structure includes a first connecting part and a second connecting part. The first connecting part is connected to the opening and protrudes outward from the bottom shell. One end of the second connecting part is connected to the side of the first connecting part away from the opening, and the other end is connected to the cover plate.

3. The housing according to claim 2, wherein: The first connecting portion and the bottom shell are a housing of an integrated structure formed by stamping.

4. The housing according to claim 3, wherein: Along the first direction, the size of the cover plate is smaller than the size of the first connecting part, the second connecting part and the cover plate are a cover body of an integral structure formed by stamping, the second connecting part is welded to the first connecting part, and the formed weld structure runs through the cover plate and the second connecting part.

5. The housing according to claim 3, wherein Along the first direction, the size of the cover plate is larger than the size of the first connecting part. The first connecting part and the second connecting part are a shell of an integral structure formed by stamping. The second connecting part is welded to the cover plate, and the formed weld structure runs through the first connecting part and the second connecting part.

6. The housing according to claim 3, wherein: Along the first direction, the size of the cover plate is equal to the size of the first connecting part. The first connecting part includes a first connecting section and a second connecting section. The first connecting section, the first connecting section and the bottom shell are a shell of an integral structure formed by stamping. The second connecting section and the cover plate are a cover body of an integral structure formed by stamping. The first connecting section is welded to the second connecting section, and the formed weld structure runs through the cover body and the shell.

7. The housing according to claim 2, wherein: Along the first direction, a size of the second connection portion is L1, 0<L1≤200 μm.

8. The housing according to claim 2, wherein: The first connection portion protrudes outward from the bottom shell by a dimension L2, 50 μm≤L2≤1000 μm.

9. A battery, characterized in that include: The housing according to any one of claims 1 to 8; The battery core is arranged in the accommodating cavity.

10. An electronic device, characterized in that A battery comprising the battery of claim 9.

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