Shell, battery cell and battery pack

Abstract

The utility model provides a shell, a battery cell and a battery pack, and relates to the technical field of batteries. The shell comprises a shell body, the shell body is provided with a containing cavity, an opening and a first wall, and the containing cavity is communicated with the outside through the opening; a glue containing groove is formed in the outer surface of the first wall. According to the battery box, the glue containing groove is formed in the shell, on one hand, glue can be embedded into the shell, so that an anchoring effect can be formed between the shell and the bottom plate of the battery box, and the binding force between the battery cell and the bottom plate of the battery box is improved; and on the other hand, the area of a glue joint surface between the shell and the bottom plate of the battery box can be increased. Therefore, the battery cell can be effectively prevented from loosening, so that the stability of the battery cell in the battery box is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a casing, a battery cell, and a battery pack. Background Technology

[0002] The battery includes a battery box and battery modules housed within the battery box. Each battery module comprises multiple cells arranged side-by-side. After the multiple cells are assembled into a battery module, the battery module is secured within the battery box.

[0003] However, the bonding force between the battery cell and the base plate of the battery box is relatively weak, which makes the battery cell prone to loosening. Utility Model Content

[0004] The embodiments of this application provide a housing, a battery cell, and a battery pack, which can increase the bonding force between the battery cell and the bottom plate of the battery box.

[0005] In a first aspect, embodiments of this application provide a housing, the housing including a housing body having a receiving cavity, an opening and a first wall, the opening communicating the receiving cavity with the outside; wherein, the outer surface of the first wall is provided with an adhesive groove.

[0006] In one embodiment, at least a portion of the adhesive reservoir extends along the periphery of the first wall.

[0007] In one embodiment, the first wall is a rectangular wall surface, and the adhesive container includes a first groove and a second groove. The first groove extends along one side line of the first wall, and there are multiple second grooves. The multiple second grooves are spaced apart along the extension direction of the first groove, and the second grooves are connected to the first groove.

[0008] In one embodiment, the extension direction of the second groove is perpendicular to the extension direction of the first groove, and the middle part of the second groove is connected to the first groove.

[0009] In one embodiment, the width of both the first groove and the second groove is W, satisfying: 0.1mm≤W≤2.5mm.

[0010] In one embodiment, the thickness of the first wall is D1, and the depth of the adhesive groove is D2, satisfying: 0 < D ≤ 0.5D1.

[0011] In one embodiment, the first wall is disposed opposite to the opening.

[0012] In one embodiment, the shell body is provided with reinforcing ribs.

[0013] In one embodiment, the reinforcing rib protrudes from the inner surface of the shell into the receiving cavity.

[0014] In one embodiment, the reinforcing rib is disposed opposite to the adhesive groove.

[0015] In one embodiment, the height dimension of the reinforcing rib is H, which satisfies: 0.05mm≤W≤0.4mm.

[0016] Secondly, embodiments of this application provide a battery cell, which includes an electrode assembly, a cover plate, a terminal post, and the aforementioned housing; the electrode assembly is disposed in a receiving cavity; the cover plate closes to the opening; the terminal post is disposed on the cover plate and connected to the electrode assembly.

[0017] Thirdly, embodiments of this application provide a battery pack, which includes a battery box and the aforementioned battery cells. The battery box has a bottom plate; the battery cells are disposed inside the battery box, and a first wall is bonded to the bottom plate.

[0018] The beneficial effects of the embodiments of this application are as follows:

[0019] In the embodiments of this application, by providing adhesive grooves on the housing, on the one hand, adhesive can be embedded inside the housing, thereby creating an anchoring effect between the housing and the bottom plate of the battery box, thus improving the bonding force between the battery cell and the bottom plate of the battery box; on the other hand, it can also increase the area of ​​the adhesive bonding surface between the housing and the bottom plate of the battery box. This effectively prevents the battery cell from loosening, thereby improving the stability of the battery cell within the battery box. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the shell structure provided in an embodiment of this application;

[0022] Figure 2 This is a structural schematic diagram of the housing provided in an embodiment of this application from another perspective;

[0023] Figure 3 This is a bottom view of the housing provided in an embodiment of this application;

[0024] Figure 4 yes Figure 3 Sectional view of AA;

[0025] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0026] Figure 6 This is a schematic diagram of the battery cell structure provided in an embodiment of this application;

[0027] Figure 7This is a schematic diagram of the battery pack structure provided in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1-Shell shell; 11-Shell body; 111-Receiving cavity; 112-Opening; 113-First wall; 114-Glue groove; 1141-First groove; 1142-Second groove; 115-Reinforcing rib;

[0030] 2-Battery cell; 22-Cover plate; 23-Terminal post;

[0031] 3-Battery pack; 31-Battery box; 311-Base plate; 312-Mounting cavity. Detailed Implementation

[0032] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a product that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such a product.

[0035] Before introducing the housing, cell, and battery pack provided by the embodiments of this application, the relevant technologies of this application will be introduced first.

[0036] In related technologies, to prevent battery expansion and thermal runaway, straps are placed on the battery module after multiple cells are assembled into a battery module. For example, straps are placed on a cell stack formed by stacking multiple square-shell cells in sequence. At the same time, adhesive is applied to the bottom of the cell to bond the bottom of the cell to the bottom plate of the battery box, thereby improving the stability of the cell within the box.

[0037] Because the bottom of the battery cells is flat, the bottom of the battery module, formed by grouping multiple cells, has a relatively large flat surface. This results in a planar bonding between the bottom of the battery module and the bottom plate of the battery box; that is, the adhesive forms a thin film between the battery module and the bottom plate. This means the adhesive relies primarily on its own strength to bond with the casing and the bottom plate, lacking a strong anchoring effect. Therefore, when the battery box is subjected to vibration, the adhesive layer can easily peel off from the bottom of the cells or from the bottom plate of the battery box, causing the cells to loosen.

[0038] Based on this, embodiments of this application provide a housing, a battery cell, and a battery pack, which can increase the bonding force between the battery cell and the bottom plate of the battery box to effectively prevent the battery cell from loosening, thereby improving the stability of the battery cell located in the battery box.

[0039] This application provides a detailed description of a housing, a battery cell, and a battery pack through the following embodiments.

[0040] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the housing 1 provided in an embodiment of this application. Figure 2 This is a structural schematic diagram of the housing 1 provided in an embodiment of this application from another perspective. An embodiment of this application provides a housing 1. The housing 1 includes a housing body 11. The housing body 11 has a receiving cavity 111, an opening 112, and a first wall 113. The opening 112 communicates the receiving cavity 111 with the outside. The outer surface of the first wall 113 is provided with an adhesive groove 114.

[0041] It can be understood that the first wall 113 can be either the side wall of the shell body 11 or the bottom wall of the shell body 11. The bottom wall is the part of the shell body 11 that is opposite to the opening 112.

[0042] It is understood that the glue container 114 can be a circular groove or a rectangular groove, or it can be a strip groove.

[0043] It is understood that when bonding the housing 1 to the base plate 311 of the battery box 31, adhesive is applied between the housing 1 and the base plate 311 of the battery box 31, and the adhesive fills the adhesive groove 114. After the adhesive cures, the housing 1 and the base plate 311 of the battery box 31 can be firmly connected.

[0044] For example, the adhesive reservoir 114 can be formed by stamping, cutting, or etching.

[0045] In this embodiment, by providing an adhesive groove 114 on the housing 1, on the one hand, the adhesive can be embedded inside the housing 1, thereby forming an anchoring effect between the housing 1 and the bottom plate 311 of the battery box 31, thus improving the bonding force between the battery cell 2 and the bottom plate 311 of the battery box 31; on the other hand, it can also increase the area of ​​the adhesive bonding surface between the housing 1 and the bottom plate 311 of the battery box 31. This effectively prevents the battery cell 2 from loosening, thereby improving the stability of the battery cell 2 within the battery box 31.

[0046] In addition, since the glue can be filled into the glue-containing groove 114 on the housing 1, the anchoring structure formed by filling the glue-containing groove 114 with glue can not only increase the bonding force between the assembled battery cell 2 and the bottom plate 311 of the battery box 31, but also help reduce the risk of uncontrolled expansion of the battery cell 2.

[0047] Please see Figure 2 In one embodiment, at least a portion of the adhesive reservoir 114 extends along the periphery of the first wall 113.

[0048] For example, when the housing 1 is applied to the cylindrical cell 2, the first wall 113 is circular, and the adhesive groove 114 can extend along the circumference of the first wall 113 into an annular groove.

[0049] For example, when the housing 1 is applied to the square battery cell 2, the first wall 113 is rectangular, and the adhesive groove 114 can extend along one side of the first wall 113 into a strip groove.

[0050] In this embodiment, by extending at least part of the adhesive receiving groove 114 along the perimeter of the first wall 113, the adhesive receiving groove 114 can be made longer, and the adhesive receiving groove 114 can be positioned and processed based on the perimeter of the first wall 113, thereby reducing the processing difficulty of the adhesive receiving groove 114.

[0051] Please see Figure 2 In one embodiment, the first wall 113 is a rectangular wall. The adhesive receiving tank 114 includes a first tank 1141 and a second tank 1142. The first tank 1141 extends along one side line of the first wall 113. There are multiple second tanks 1142. The multiple second tanks 1142 are spaced apart along the extending direction of the first tank 1141. The second tanks 1142 communicate with the first tank 1141. In this way, the adhesive receiving tank 114 can be more evenly distributed on the first wall 113, thereby improving the stress state of the first wall 113 and avoiding stress concentration.

[0052] For example, there are three second slots 1142, one of which is located in the middle of the first slot 1141, and the other two are located at the two ends of the first slot 1141 respectively.

[0053] Please see Figure 2 In one embodiment, the extension direction of the second groove 1142 is perpendicular to the extension direction of the first groove 1141. The middle portion of the second groove 1142 is connected to the first groove 1141.

[0054] It is understood that the first groove 1141 extends along the first edge line of the first wall 113, and the second groove 1142 extends along the second edge line of the first wall 113. The first edge line and the second edge line are perpendicular to each other.

[0055] Specifically, the first wall 113 is a rectangular wall with a long side and a wide side. A first groove 1141 extends along the long side, and a second groove 1142 extends along the wide side. The extending direction of the first groove 1141 intersects the midpoint of the wide side.

[0056] In this embodiment, the above-mentioned arrangement can improve the structural symmetry of the first wall 113, thereby improving the stress state of the first wall 113 and avoiding stress concentration.

[0057] Please see Figure 3 , Figure 3 This is a bottom view of the housing 1 provided in an embodiment of this application. In one embodiment, the width dimension of both the first groove 1141 and the second groove 1142 is W, satisfying: 0.1mm≤W≤2.5mm.

[0058] It is understood that the width dimension W includes, but is not limited to, 0.1mm, 0.2mm, 0.3mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, and 2.5mm.

[0059] In this embodiment, the above-mentioned arrangement can, on the one hand, prevent the width of the first groove 1141 and the second groove 1142 from being too small, which would be detrimental to the flow of adhesive into the adhesive container 114, thereby improving the filling performance of the adhesive in the adhesive container 114 and thus improving the bonding force between the battery cell 2 and the bottom plate 311 of the battery box 31; on the other hand, it can prevent the width of the first groove 1141 and the second groove 1142 from being too large, which would affect the strength of the first wall 113, thereby effectively ensuring the strength of the casing 1 and thus ensuring the structural reliability of the battery cell 2.

[0060] Please see Figure 4 or Figure 5 , Figure 4 yes Figure 3 Sectional view of AA Figure 5 yes Figure 4 Enlarged view at point B. In one embodiment, the thickness of the first wall 113 is D1, and the depth of the adhesive groove 114 is D2, satisfying: 0 < D ≤ 0.5D1.

[0061] It is understood that the depth dimension D2 of the adhesive reservoir 114 includes, but is not limited to, 0.05D1, 0.1D1, 0.15D1, 0.2D1, 0.25D1, 0.3D1, 0.35D1, 0.4D1, 0.42D1, 0.44D1, 0.46D1, 0.48D1, 0.49D1, and 0.5D1.

[0062] In this embodiment, by limiting the depth dimension D2 of the adhesive groove 114 to be too large and thus affecting the thickness of the first wall 113, the strength of the shell 1 can be effectively guaranteed, which is conducive to ensuring the structural reliability of the battery cell 2.

[0063] Please see Figure 4 In one embodiment, the first wall 113 is disposed opposite to the opening 112. This allows the first wall 113 to be positioned away from the cover plate 22 of the battery cell 2, thereby preventing straps, cable ties, and brackets from affecting the bonding between the first wall 113 and the bottom wall of the battery box 31. This improves the ease of bonding the battery cell 2 to the bottom wall of the battery box 31.

[0064] Please see Figure 5 In one embodiment, the shell body 11 is provided with reinforcing ribs 115. This can improve the strength of the shell 1, which helps to ensure the structural reliability of the battery cell 2 and can help prevent the battery cell 2 from expanding uncontrollably.

[0065] For example, the reinforcing rib 115 can be provided on the outer surface of the shell body 11 or on the inner surface of the shell body 11. The reinforcing rib 115 can be provided on the side wall of the shell body 11 or on the bottom wall of the shell body 11.

[0066] Please see Figure 5 In one embodiment, the reinforcing rib 115 protrudes from the inner surface of the housing 1 into the receiving cavity 111. This makes the outer surface of the cell 2 flat, which is beneficial for the assembly of the cells 2, thereby improving the assembly efficiency of the battery pack 3.

[0067] Please see Figure 4 In one embodiment, the reinforcing rib 115 is disposed opposite to the adhesive receiving groove 114. In this way, the strength of the part where the adhesive receiving groove 114 is disposed can be increased by the reinforcing rib 115, thereby increasing the strength of the housing 1.

[0068] Optionally, in the width direction of the adhesive reservoir 114, the width dimension of the reinforcing rib 115 is less than or equal to the width dimension of the adhesive reservoir 114.

[0069] Please see Figure 5 In one embodiment, the height dimension of the reinforcing rib 115 is H, which satisfies: 0.05mm≤W≤0.4mm.

[0070] It is understood that the height dimension H of the reinforcing rib 115 protrusion includes, but is not limited to, 0.05mm, 0.08mm, 0.12mm, 0.15mm, 0.18mm, 0.21mm, 0.23mm, 0.25mm, 0.27mm, 0.3mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, and 0.4mm.

[0071] In this embodiment, by limiting the height dimension H of the reinforcing rib 115, on the one hand, it can be avoided that the height of the reinforcing rib 115 is too small and the increase in strength of the shell 1 is not obvious; on the other hand, it can be avoided that the height of the reinforcing rib 115 is too large and affects the size of the electrode assembly, so as to ensure the energy density of the cell 2.

[0072] Based on the above embodiments, the housing 1 provided in the embodiments of this application is described as follows.

[0073] Please see Figures 1-5 This application provides a housing 1. The housing 1 includes a housing body 11. The housing body 11 has a receiving cavity 111, an opening 112, and a first wall 113. The opening 112 communicates the receiving cavity 111 with the outside. The outer surface of the first wall 113 is provided with an adhesive groove 114. At least a portion of the adhesive groove 114 extends along the circumference of the first wall 113.

[0074] Specifically, the first wall 113 is a rectangular wall. The adhesive container 114 includes a first groove 1141 and a second groove 1142. The first groove 1141 extends along one side line of the first wall 113. There are multiple second grooves 1142. The multiple second grooves 1142 are spaced apart along the extending direction of the first groove 1141. The second grooves 1142 are connected to the first groove 1141.

[0075] Specifically, the extension direction of the second groove 1142 is perpendicular to the extension direction of the first groove 1141. The middle part of the second groove 1142 is connected to the first groove 1141.

[0076] Specifically, at least one of the first groove 1141 and the second groove 1142 has an opening size smaller than the bottom size. This increases the anchoring force between the housing 1 and the bottom plate 311 of the battery box 31, thereby improving the bonding force between the battery cell 2 and the bottom plate 311 of the battery box 31.

[0077] Specifically, the width of both the first groove 1141 and the second groove 1142 is W, satisfying: 0.1mm≤W≤2.5mm.

[0078] Specifically, the thickness of the first wall 113 is D1, and the depth of the adhesive groove 114 is D2, satisfying: 0 < D ≤ 0.5D1.

[0079] Specifically, the first wall 113 is positioned opposite to the opening 112.

[0080] Specifically, a reinforcing rib 115 is provided on the shell body 11. The reinforcing rib 115 protrudes from the inner surface of the shell 1 into the receiving cavity 111. The reinforcing rib 115 is arranged opposite to the adhesive groove 114. The height dimension of the protruding reinforcing rib 115 is H, which satisfies: 0.05mm≤W≤0.4mm.

[0081] Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of the battery cell 2 provided in an embodiment of this application. Accordingly, an embodiment of this application also provides a battery cell 2. The battery cell 2 includes an electrode assembly, a cover plate 22, a terminal post 23, and the aforementioned housing 1. The electrode assembly is disposed in the receiving cavity 111. The cover plate 22 covers the opening 112. The terminal post 23 is disposed on the cover plate 22 and connected to the electrode assembly.

[0082] It is understood that the electrode assembly includes at least a positive electrode, a separator, and a negative electrode stacked sequentially. The positive electrode may be connected to the terminal 23, and the negative electrode may be connected to the cover plate 22, thus allowing the terminal 23 and the cover plate 22 to serve as the positive and negative output terminals of the battery cell 2, respectively. Alternatively, there may be two terminals 23, a positive terminal 23 and a negative terminal 23. The positive electrode is connected to the positive terminal 23, and the negative electrode is connected to the negative terminal 23, thus allowing the two terminals 23 to serve as the positive and negative output terminals of the battery cell 2, respectively.

[0083] In this embodiment, by employing the housing 1 provided in some embodiments of this application, on the one hand, the adhesive can be embedded within the housing 1, thereby forming an anchoring effect between the housing 1 and the base plate 311 of the battery box 31, thus improving the bonding force between the battery cell 2 and the base plate 311 of the battery box 31; on the other hand, the area of ​​the adhesive bonding surface between the housing 1 and the base plate 311 of the battery box 31 can also be increased. Thus, the loosening of the battery cell 2 can be effectively prevented, thereby improving the stability of the battery cell 2 within the battery box 31.

[0084] Please see Figure 7 , Figure 7 This is a schematic diagram of the structure of the battery pack 3 provided in an embodiment of this application. Accordingly, an embodiment of this application also provides a battery pack 3. The battery pack 3 includes a battery box 31 and the aforementioned battery cell 2. The battery box 31 has a base plate 311. The battery cell 2 is disposed inside the battery box 31, and the first wall 113 is bonded to the base plate 311.

[0085] In this embodiment, by employing the battery cell 2 provided in some embodiments of this application, on the one hand, the adhesive can be embedded inside the housing 1, thereby forming an anchoring effect between the housing 1 and the base plate 311 of the battery box 31, thus improving the bonding force between the battery cell 2 and the base plate 311 of the battery box 31; on the other hand, the area of ​​the adhesive surface between the housing 1 and the base plate 311 of the battery box 31 can also be increased. Thus, the loosening of the battery cell 2 can be effectively prevented, improving the stability of the battery cell 2 within the battery box 31, thereby enhancing the reliability of the battery pack 3.

[0086] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A housing, characterized in that, include: The shell body has a receiving cavity, an opening, and a first wall, the opening communicating the receiving cavity with the outside. The outer surface of the first wall is provided with an adhesive groove; At least a portion of the adhesive reservoir extends along the circumference of the first wall; The first wall is a rectangular wall surface, and the adhesive container includes a first groove and a second groove. The first groove extends along one side line of the first wall, and there are multiple second grooves. The multiple second grooves are spaced apart along the extension direction of the first groove, and the second grooves are connected to the first groove.

2. The housing according to claim 1, characterized in that, The second groove extends perpendicularly to the first groove, and the middle part of the second groove is connected to the first groove.

3. The housing according to claim 2, characterized in that, The width of both the first groove and the second groove is W, which satisfies: 0.1mm≤W≤2.5mm.

4. The housing according to any one of claims 1-3, characterized in that, The thickness of the first wall is D1, and the depth of the adhesive groove is D2, satisfying: 0 < D ≤ 0.5D1.

5. The housing according to any one of claims 1-3, characterized in that, The first wall is positioned opposite to the opening.

6. The housing according to any one of claims 1-3, characterized in that, The shell body is provided with reinforcing ribs.

7. The housing according to claim 6, characterized in that, The reinforcing ribs protrude from the inner surface of the shell into the receiving cavity.

8. The housing according to claim 7, characterized in that, The reinforcing rib is positioned opposite to the adhesive groove.

9. The housing according to claim 7, characterized in that, The height of the protruding reinforcing rib is H, which satisfies the following condition: 0.05mm≤W≤0.4mm.

10. A battery cell, characterized in that, include: The housing as described in any one of claims 1-9; The electrode assembly is disposed in the receiving cavity; Cover plate, which closes the opening; And an electrode post, disposed on the cover plate and connected to the electrode assembly.

11. A battery pack, characterized in that, include: Battery box, with a base plate; And, as described in claim 10, the battery cell is disposed inside the battery box, and the first wall is bonded to the base plate.

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