Battery shell and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery shell and a battery, the battery shell comprises a shell, a sealing element and a terminal, the shell is also provided with a mounting through hole, the sealing element comprises a first limiting part, a first inserting part and an inserting through hole, one end of the first inserting part is connected to the first limiting part, the other end of the first inserting part is inserted into the mounting through hole, and the terminal is inserted into the first limiting part. The terminal comprises a second limiting part and a second inserting part, one end of the second inserting part is connected to the second limiting part, the other end of the second inserting part is inserted into the inserting through hole, a pressing protrusion surrounding the outer side of the second inserting part is further arranged at the joint of the second limiting part and the second inserting part, and the pressing protrusion is used for extruding the sealing piece. Compared with the prior art, the extrusion degree of the sealing element is increased by pressing the bulge, so that the deformation quantity of the sealing element is further increased, a better sealing effect is achieved, the battery shell has higher air tightness, the risk of electrolyte leakage is greatly reduced, and the safety is improved.

Description

Technical Field

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

[0002] The electrolyte is known as the "blood" of lithium batteries. It is a substance full of electrochemical activity. Its main function is to carry lithium ions inside the battery and move back and forth between the positive and negative electrodes to achieve energy storage and release. This liquid is not only related to the energy efficiency and life of the battery, but also directly affects the safety and overall performance of the battery. Therefore, as a medium for ion transmission in the battery, the electrolyte that promotes the energy conversion and storage of lithium batteries plays a very important role in the battery.

[0003] At present, in order to prevent electrolyte leakage, batteries usually install sealing rings between the terminals connected to the lugs of the battery cells and the shell to seal the battery and prevent electrolyte leakage. However, as the battery is discharged over a long period of time, pressure will gradually be generated inside, which will exert force on the terminals, offsetting the squeezing force of the terminals on the sealing rings, resulting in a decrease in the squeezing force of the terminals on the sealing rings and a decrease in the deformation of the sealing rings, which not only leads to poor air tightness, but also easily leads to the risk of electrolyte leakage, posing a safety hazard. Utility Model Content

[0004] The utility model aims to provide a battery shell and a battery with good airtightness and high safety.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] In one aspect, a battery housing is provided, the battery housing comprising:

[0007] A housing, wherein a storage space for storing the battery cell is provided in the housing, and the housing is also provided with a mounting through hole connected to the storage space;

[0008] A sealing member, the sealing member comprises a first limiting portion and a first plug-in portion, and is provided with a plug-in through hole penetrating the first limiting portion and the first plug-in portion, one end of the first plug-in portion is connected to the first limiting portion, the other end of the first plug-in portion is inserted into the mounting through hole, and a surface of a side of the first limiting portion connected to the first plug-in portion abuts against the housing;

[0009] The terminal includes a second limiting portion and a second plug-in portion, one end of the second plug-in portion is connected to the second limiting portion, the other end of the second plug-in portion is inserted into the plug-in through hole and connected to the pole ear of the battery cell, and a rivet hole for riveting is also provided on the second plug-in portion. A pressing protrusion surrounding the outside of the second plug-in portion is also provided at the junction of the second limiting portion and the second plug-in portion, and the pressing protrusion is used to squeeze the seal.

[0010] Optionally, the pressing protrusion is a right-angle boss extending from one side of the shell toward the shell and close to the shell, and is arranged around the outside of the second plug-in portion, and the first limiting portion of the seal is clamped between the pressing protrusion and the shell.

[0011] Optionally, an arc-shaped protrusion extending along the junction near the first limiting portion and the first plug-in portion is provided at the junction of the second limiting portion and the second plug-in portion to form the pressing protrusion, and the seal has an arc surface at the junction of the first limiting portion and the first plug-in portion on the side facing the terminal, and the arc-shaped protrusion is pressed on the arc surface of the seal.

[0012] Optionally, a diameter of the plugging through hole penetrating the first limiting portion and the first plugging portion gradually decreases in a direction away from the first limiting portion.

[0013] Optionally, an outer diameter of the first plug-in portion gradually decreases in a direction away from the first limiting portion.

[0014] Optionally, the riveting hole is a stepped hole, so as to form a limiting step surface in the second plug-in portion.

[0015] Optionally, the riveting hole includes a first hole segment and a second hole segment connected to each other, the inner diameter of the first hole segment is larger than the inner diameter of the second hole segment, so as to form the limiting step surface at the junction of the first hole segment and the second hole segment, the first hole segment is a straight hole, and the second hole segment is a tapered hole.

[0016] Optionally, a projection area of ​​the first limiting portion on the shell is larger than a projection area of ​​the second limiting portion on the shell.

[0017] On the other hand, a battery is also provided, comprising the battery casing as described in any one of the above items.

[0018] Beneficial effects of the utility model:

[0019] The utility model provides a battery shell, which forms a seal by adopting a first limiting portion and a first plug-in portion to expand the area covered by the seal, thereby improving the sealing performance of the battery shell, and by arranging a pressing protrusion surrounding the outer side of the second plug-in portion on the terminal, so that when the second plug-in portion of the terminal is inserted into the plug-in through hole of the seal, in addition to squeezing the first limiting portion of the seal by the second limiting portion on the terminal and squeezing the first plug-in portion of the seal by the second plug-in portion on the terminal to deform the seal and perform sealing, the degree of squeezing the seal can be increased by the pressing protrusion, so that the deformation of the seal is further increased, thereby having a better sealing effect, not only making the battery shell have a higher airtightness, but also greatly reducing the risk of electrolyte leakage, thereby improving safety.

[0020] The utility model provides a battery, which reduces the risk of electrolyte leakage by adopting the battery shell, thereby improving the energy efficiency of the battery and extending the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a partial structural exploded view of the battery housing provided by the utility model;

[0022] Figure 2 This is an enlarged view of the structure of the battery housing provided by the utility model after the terminals are riveted;

[0023] Figure 3 This is a schematic diagram of the terminal structure of the first embodiment of the battery housing provided by the utility model;

[0024] Figure 4 This is a schematic diagram of the terminal structure of the second embodiment of the battery housing provided by the utility model;

[0025] Figure 5 It is a structural schematic diagram of a sealing member in a battery housing provided by the utility model.

[0026] In the figure:

[0027] 1. Shell; 11. Storage space;

[0028] 2. Sealing member; 21. First limiting portion; 22. First plug-in portion; 23. Plug-in through hole;

[0029] 3. Terminal; 31. Second limiting portion; 32. Second plug-in portion; 33. Riveting hole; 331. First hole section; 332. Second hole section; 333. Limiting step surface; 34. Pressing protrusion. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] The electrolyte is known as the "blood" of lithium batteries. It is a substance full of electrochemical activity. Its main function is to carry lithium ions inside the battery and move back and forth between the positive and negative electrodes to achieve energy storage and release. This liquid is not only related to the energy efficiency and life of the battery, but also directly affects the safety and overall performance of the battery. Therefore, as a medium for ion transmission in the battery, the electrolyte that promotes the energy conversion and storage of lithium batteries plays a very important role in the battery.

[0035] At present, in order to prevent electrolyte leakage, batteries usually install sealing rings between the terminals connected to the lugs of the battery cells and the shell to seal the battery and prevent electrolyte leakage. However, as the battery is discharged over a long period of time, pressure will gradually be generated inside, which will exert force on the terminals, offsetting the squeezing force of the terminals on the sealing rings, resulting in a decrease in the squeezing force of the terminals on the sealing rings and a decrease in the deformation of the sealing rings, which not only leads to poor air tightness, but also easily leads to the risk of electrolyte leakage, posing a safety hazard.

[0036] Embodiment 1

[0037] Therefore, in order to improve the air tightness of the battery, reduce the risk of electrolyte leakage, and reduce safety hazards, this embodiment provides a battery casing.

[0038] like Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, the battery housing includes a shell 1, a sealing member 2 and a terminal 3. The shell 1 is provided with a storage space 11 for storing the battery cell. The shell 1 is also provided with a mounting through hole connected to the storage space 11. The sealing member 2 includes a first limiting portion 21 and a first plug-in portion 22, and is provided with a plug-in through hole 23 that passes through the first limiting portion 21 and the first plug-in portion 22. One end of the first plug-in portion 22 is connected to the first limiting portion 21, and the other end of the first plug-in portion 22 is inserted into the mounting through hole. The first limiting portion 21 and the first plug-in portion 22 are connected to each other. The surface of one side connected with 22 abuts against the shell 1, and the terminal 3 includes a second limiting portion 31 and a second plug-in portion 32. One end of the second plug-in portion 32 is connected to the second limiting portion 31, and the other end of the second plug-in portion 32 is inserted into the plug-in through hole 23 and connected to the pole ear of the battery cell. A rivet hole 33 for riveting is also provided on the second plug-in portion 32. A pressing protrusion 34 surrounding the outside of the second plug-in portion 32 is also provided at the junction of the second limiting portion 31 and the second plug-in portion 32, and the pressing protrusion 34 is used to squeeze the seal 2.

[0039] The battery shell adopts a first limiting portion 21 and a first plug-in portion 22 to form a seal 2, thereby expanding the area covered by the seal 2, thereby improving the sealing of the battery shell, and by providing a pressing protrusion 34 surrounding the outside of the second plug-in portion 32 on the terminal 3, when the second plug-in portion 32 of the terminal 3 is inserted into the plug-in through hole 23 of the seal 2, in addition to squeezing the first limiting portion 21 of the seal 2 by the second limiting portion 31 on the terminal 3, squeezing the first plug-in portion 22 of the seal 2 by the second plug-in portion 32 on the terminal 3, so that the seal 2 is deformed and sealed, the degree of squeezing the seal 2 can also be increased by the pressing protrusion 34, so that the deformation of the seal 2 is further increased, thereby having a better sealing effect, not only making the battery shell have a higher airtightness, but also greatly reducing the risk of electrolyte leakage, thereby improving safety.

[0040] The battery shell can be used in a variety of battery types with different shapes, and in this embodiment, it is mainly used in cylindrical batteries. In this embodiment, in order to ensure the firmness of the connection between the terminal 3, the seal 2 and the shell 1, after the first plug-in portion 22 of the seal 2 is inserted into the mounting through hole of the shell 1, and the second plug-in portion 32 of the terminal 3 is inserted into the plug-in through hole 23 of the seal 2, pressure is applied to the second plug-in portion 32 of the terminal 3 through a riveting process. Since the second plug-in portion 32 is provided with a riveting hole 33, the second plug-in portion 32 is deformed and turned outward, and the first plug-in portion 22 of the seal 2 is squeezed and fixed between the second plug-in portion 32 and the inner side of the shell 1. In this embodiment, the seal 2 is a sealing sleeve made of rubber material, and the seal 2 composed of the first limit portion 21 and the first plug-in portion 22 is manufactured by an injection molding process.

[0041] Alternatively, if Figure 3 As shown, the pressing protrusion 34 is a right-angle boss extending from one side of the second limiting portion 31 toward the housing 1 and arranged around the outside of the second plug-in portion 32, and the first limiting portion 21 of the seal 2 is sandwiched between the pressing protrusion 34 and the housing 1. By forming a right-angle boss extending from one side of the second limiting portion 31 toward the housing 1 and arranged around the outside of the second plug-in portion 32 as the pressing protrusion 34, the second limiting portion 31 protrudes a section of the structure toward the direction of the seal 2, thereby increasing the degree of compression of the seal 2 by using the right-angle boss, so that the deformation of the seal 2 is further increased, so as to enhance the sealing effect and improve the air tightness.

[0042] The thickness of the right-angle boss and the width of the area that can be covered can be freely set according to needs. In this embodiment, the thickness of the right-angle boss is 0.25 mm and the width is 0.8 mm.

[0043] Alternatively, if Figure 5 As shown, the diameter of the plug-in hole 23 penetrating the first limiting portion 21 and the first plug-in portion 22 gradually decreases in the direction away from the first limiting portion 21. By making the diameter of the plug-in hole 23 penetrating the first limiting portion 21 and the first plug-in portion 22 gradually decrease in the direction away from the first limiting portion 21, when the second plug-in portion 32 of the terminal 3 is inserted into the plug-in hole 23, the degree of tightness with the sealing member 2 will gradually increase, thereby improving the sealing performance between the sealing member 2 and the terminal 3.

[0044] Alternatively, if Figure 5 As shown, the outer diameter of the first plug-in portion 22 gradually decreases in the direction away from the first limiting portion 21. By gradually decreasing the outer diameter of the first plug-in portion 22 in the direction away from the first limiting portion 21, when the first plug-in portion 22 of the seal 2 is inserted into the mounting through hole, it is first inserted from the end with a smaller outer diameter, thereby facilitating the insertion of the seal 2 into the mounting through hole of the housing 1, and as the insertion distance of the seal 2 gradually increases, its outer diameter gradually increases, thereby improving the sealing between the seal 2 and the housing 1.

[0045] Alternatively, if Figure 3 As shown, the rivet hole 33 is a stepped hole, which is used to form a limiting step surface 333 in the second plug-in portion 32. By using the stepped hole as the rivet hole 33, a limiting step surface 333 is formed in the rivet hole 33, so that the riveting head is limited during riveting, thereby avoiding excessive riveting and causing poor forming of the terminal 3.

[0046] Furthermore, if Figure 3 As shown, the riveting hole 33 includes a first hole section 331 and a second hole section 332 which are connected to each other. The inner diameter of the first hole section 331 is larger than the inner diameter of the second hole section 332, so as to form a limiting step surface 333 at the junction of the first hole section 331 and the second hole section 332. The first hole section 331 is a straight hole, and the second hole section 332 is a tapered hole. By using a straight hole for the first hole section 331, it is ensured that the structure at the first hole section 331 is evenly turned outward during riveting, and the second hole section 332 is a tapered hole, so that more material is retained after the riveting hole 33 is opened in the second plug-in portion 32, thereby ensuring the structural strength of the terminal 3.

[0047] Alternatively, if Figure 2 As shown, the projection area of ​​the first limiting portion 21 on the housing 1 is larger than the projection area of ​​the second limiting portion 31 on the housing 1. By making the projection area of ​​the first limiting portion 21 on the housing 1 larger than the projection area of ​​the second limiting portion 31 on the housing 1, the first limiting portion 21 can cover a larger area on the housing 1, thereby improving the sealing effect of the sealing member 2, reducing the risk of electrolyte leakage, and improving safety.

[0048] In this embodiment, a battery is also provided, which includes the above-mentioned battery casing. By adopting the above-mentioned battery casing, the battery reduces the risk of electrolyte leakage, thereby improving the energy efficiency of the battery and extending its service life.

[0049] Embodiment 2

[0050] Figure 4 The second embodiment is shown, wherein the components identical or corresponding to those of the first embodiment are marked with the corresponding reference numerals of the first embodiment. For the sake of simplicity, only the differences between the second embodiment and the first embodiment are described.

[0051] The difference lies in that, in addition to forming a right-angle boss extending in a direction close to the shell 1 and arranged on the outside of the second plug-in portion 32 as a pressing protrusion 34 on the side of the second limiting portion 31 toward the shell 1 as in the first embodiment, an arc-shaped protrusion extending along the junction close to the first limiting portion 21 and the first plug-in portion 22 can also be provided at the junction of the second limiting portion 31 and the second plug-in portion 32 to form a pressing protrusion 34, and the seal 2 is an arc surface at the junction of the first limiting portion 21 and the first plug-in portion 22 toward the terminal 3, and the arc-shaped protrusion is squeezed on the arc surface of the seal 2.

[0052] By using the arc-shaped protrusion at the junction of the second limiting portion 31 and the second plug-in portion 32 as the pressing protrusion 34, on the one hand, the degree of extrusion of the seal 2 can be increased by the arc-shaped protrusion, thereby further increasing the deformation of the seal 2, so as to enhance the sealing effect and improve the air tightness. On the other hand, the concentricity between the seal 2 and the terminal 3 can be improved by the fit between the arc surface and the arc-shaped protrusion, thereby improving the assembly accuracy.

[0053] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery housing, characterized in that: The battery housing comprises: A housing (1), wherein a storage space (11) for storing a battery cell is provided in the housing (1), and a mounting through hole communicating with the storage space (11) is also provided on the housing (1); A sealing member (2), the sealing member (2) comprising a first limiting portion (21) and a first plug-in portion (22), and being provided with a plug-in through hole (23) penetrating the first limiting portion (21) and the first plug-in portion (22), one end of the first plug-in portion (22) being connected to the first limiting portion (21), the other end of the first plug-in portion (22) being inserted into the mounting through hole, and a surface of a side of the first limiting portion (21) connected to the first plug-in portion (22) being in contact with the housing (1); The terminal (3) comprises a second limiting portion (31) and a second plug-in portion (32), one end of the second plug-in portion (32) is connected to the second limiting portion (31), the other end of the second plug-in portion (32) is inserted into the plug-in through hole (23) and connected to the pole ear of the battery cell, the second plug-in portion (32) is also provided with a rivet hole (33) for riveting, and a pressing protrusion (34) surrounding the outer side of the second plug-in portion (32) is also provided at the junction of the second limiting portion (31) and the second plug-in portion (32), and the pressing protrusion (34) is used to squeeze the sealing member (2).

2. The battery housing according to claim 1, characterized in that: The pressing protrusion (34) is a right-angle boss extending from the second limiting portion (31) toward one side of the shell (1) in a direction close to the shell (1) and arranged around the outside of the second plug-in portion (32); the first limiting portion (21) of the sealing member (2) is sandwiched between the pressing protrusion (34) and the shell (1).

3. The battery housing according to claim 1, characterized in that: An arc-shaped protrusion extending along the junction near the first limiting portion (21) and the first plug-in portion (22) is provided at the junction of the second limiting portion (31) and the second plug-in portion (32) to form the pressing protrusion (34); the sealing member (2) has an arc surface at the junction of the first limiting portion (21) and the first plug-in portion (22) on the side facing the terminal (3), and the arc-shaped protrusion is pressed on the arc surface of the sealing member (2).

4. The battery housing according to claim 1, characterized in that: The diameter of the plug-in through hole (23) penetrating the first limiting portion (21) and the first plug-in portion (22) gradually decreases in a direction away from the first limiting portion (21).

5. The battery housing according to claim 1, characterized in that: The outer diameter of the first plug-in portion (22) gradually decreases in a direction away from the first limiting portion (21).

6. The battery housing according to claim 1, characterized in that: The riveting hole (33) is a stepped hole, used to form a limiting step surface (333) in the second plug-in portion (32).

7. The battery housing according to claim 6, characterized in that: The riveting hole (33) comprises a first hole section (331) and a second hole section (332) which are connected to each other, the inner diameter of the first hole section (331) is larger than the inner diameter of the second hole section (332), so as to form the limiting step surface (333) at the junction of the first hole section (331) and the second hole section (332), the first hole section (331) is a straight hole, and the second hole section (332) is a tapered hole.

8. The battery housing according to claim 1, characterized in that: The projection area of ​​the first limiting portion (21) on the housing (1) is greater than the projection area of ​​the second limiting portion (31) on the housing (1).

9. A battery, characterized in that The battery comprises the battery casing according to any one of claims 1 to 8.

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