A battery cell

Abstract

This utility model relates to the field of battery technology, and in particular to a battery cell, including a housing, an electrode assembly, and a first terminal assembly. The housing has a receiving cavity, the electrode assembly is disposed in the receiving cavity, and the first terminal assembly includes a first mounting ring and a first terminal. The first mounting ring includes a first extension, a first limiting portion, and a first reinforcing portion. The first extension is annularly arranged and passes through the housing along a first direction, and the first extension has a first cavity. The first limiting portion is disposed on the side of the first extension away from the electrode assembly and extends into the first cavity. At least a portion of the first terminal is located in the first cavity, and the first terminal and the first limiting portion are engaged in a limiting fit in the first direction. A first reinforcing structure is added between the first limiting portion and the first extension to improve the connection strength between the first limiting portion and the first extension, and to prevent deformation of the first mounting ring at the connection node between the first limiting portion and the extension.

Description

Technical Field

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

[0002] The welding ring is a connector in a battery cell used to attach the terminals to the battery casing. Its structural stability directly affects the battery's reliability, lifespan, and safety. During battery assembly, a holding force is applied to the battery casing to hold the welding ring, which in turn holds the terminals. Increasing the holding force applied to the battery casing during assembly improves the strength of the connection between the terminals and the casing.

[0003] In existing battery cells, when the holding force of the battery casing on the welding ring is set to be large, the part of the welding ring that holds the terminal post is prone to deformation, making it difficult to ensure a firm connection between the terminal post and the battery casing. Utility Model Content

[0004] The technical problem to be solved by this utility model is that when the existing welding ring is subjected to a large holding force applied by the battery casing, the part of the welding ring that holds the terminal post is prone to deformation, making it difficult to ensure that the terminal post is firmly connected to the battery casing.

[0005] To address the aforementioned technical problems, a battery cell is provided, having a first orientation, the battery cell comprising:

[0006] A housing having a receiving cavity;

[0007] An electrode assembly disposed in the receiving cavity;

[0008] A first electrode assembly includes a first mounting ring and a first electrode post. The first mounting ring includes a first extension, a first limiting portion, and a first reinforcing structure. The first extension is annular and passes through the housing along the first direction. The first extension has a first cavity. The first limiting portion is located on the side of the first extension away from the electrode assembly and extends into the first cavity. At least a portion of the first electrode post is located in the first cavity, and the first electrode post and the first limiting portion are mutually limitingly engaged in the first direction. The first reinforcing structure is located between the first extension and the first limiting portion.

[0009] As a preferred embodiment, the first reinforcing structure includes a first reinforcing portion, which is connected to both the first extension portion and the first limiting portion, and the first reinforcing portion extends circumferentially along at least a portion of the first assembly ring.

[0010] As a preferred embodiment, the first reinforcing part is a rounded corner structure disposed between the first extension part and the first limiting part, and the rounded corner structure protrudes toward the inner side of the first assembly ring.

[0011] As a preferred embodiment, the first reinforcing structure includes a second reinforcing part, which is a reinforcing rib connected to both the first extension and the first limiting part. The second reinforcing part has multiple ribs that are spaced apart circumferentially along the first assembly ring.

[0012] As a preferred embodiment, the first assembly ring further includes a second limiting portion and a second reinforcing structure; the second limiting portion is fixed on the side of the first extension away from the first limiting portion, the second limiting portion is located in the receiving cavity, and the second limiting portion extends in a direction away from the first cavity.

[0013] The first pole assembly further includes a first sealing ring, the first sealing ring being elastic, a portion of the first sealing ring being located between the second limiting portion and the housing in the first direction, and the second reinforcing structure being disposed between the second limiting portion and the first extension portion.

[0014] As a preferred embodiment, the second reinforcing structure is located on the outer periphery of the first assembly ring;

[0015] The second reinforcing structure includes a third reinforcing portion, which is connected to both the first extension portion and the second limiting portion, and the third reinforcing portion extends circumferentially around at least a portion of the first assembly ring; or, the second reinforcing structure includes a fourth reinforcing portion, which is connected to both the first extension portion and the second limiting portion, and the fourth reinforcing portion is provided in multiple portions and is spaced apart circumferentially along the first assembly ring.

[0016] As a preferred embodiment, the first sealing ring has a first mating portion that matches the second reinforcing structure.

[0017] As a preferred embodiment, the first pole post assembly further includes a first plastic part, a first pressure ring, and a second plastic part. The first pressure ring and the first plastic part are both connected to the first assembly ring and located on the outer periphery of the first assembly ring. A portion of the first plastic part is located between the first pressure ring and the housing in the first direction, and another portion of the first plastic part is located between the first assembly ring and the housing.

[0018] The electrode assembly includes an electrode body and a first tab connected to the electrode body. The first tab is electrically connected to the first electrode post. The second plastic part is located between the housing and the electrode assembly and is connected to the housing.

[0019] The second plastic part includes a body portion and a first recess portion disposed on the body portion. The first recess portion is recessed towards one side of the electrode assembly. The first recess portion has a recessed space and a first through hole communicating with the recessed space. The first through hole allows the first electrode tab or the first electrode post to pass through. The second limiting portion is located between the housing and the first recess portion, and at least a portion of the second limiting portion is located within the recessed space. In the first direction, one side of the body portion abuts against the housing, and the other side abuts against the electrode body.

[0020] As a preferred embodiment, the housing includes a housing body and an end cap, the receiving cavity is disposed in the housing body, and the end cap is connected to the housing body and seals the receiving cavity; the first extension passes through the housing body, and the first pole post assembly and the end cap are located on opposite sides of the housing body in the first direction.

[0021] As a preferred embodiment, the battery cell further includes a second terminal assembly, the second terminal assembly and the first terminal assembly being located on the same side of the housing body in the first direction; the second terminal assembly includes a second terminal passing through the housing body, and at least one of the second terminal and the first terminal is insulated from the housing body.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] The present invention discloses a battery cell comprising a housing, an electrode assembly, and a first terminal post assembly. The housing has a receiving cavity, and the electrode assembly is disposed in the receiving cavity. The first terminal post assembly includes a first mounting ring and a first terminal post. The first mounting ring includes a first extension, a first limiting portion, and a first reinforcing portion. The first extension is annularly arranged and passes through the housing along a first direction, and the first extension has a first cavity. The first limiting portion is disposed on the side of the first extension away from the electrode assembly and extends into the first cavity. At least a portion of the first terminal post is located in the first cavity, and the first terminal post and the first limiting portion are engaged in a limiting fit in the first direction. During the operation of the battery cell, there is an interaction force between the first terminal post and the first limiting portion in the first direction. To prevent this force from causing the first limiting portion to deform in the first direction, a first reinforcing structure is added between the first limiting portion and the first extension, thereby improving the connection strength between the first limiting portion and the first extension, and improving the ability of the first limiting portion to resist deformation in the first direction. This prevents the first mounting ring from deforming at the connection node between the first limiting portion and the extension, thereby ensuring a firm connection of the first terminal post to the battery housing. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the external structure of the battery cell of this utility model;

[0025] Figure 2 This is a cross-sectional view of the battery cell of this utility model at the first electrode post;

[0026] Figure 3 yes Figure 2 A magnified view of a section at point C;

[0027] Figure 4 yes Figure 3 A magnified view of a section at point D;

[0028] Figure 5 This is a schematic diagram of the first assembly ring when the first reinforcing structure is set as a rounded corner structure;

[0029] Figure 6 This is a schematic diagram of the assembly structure of the first pole post, the first sealing ring, and the first assembly ring when the first reinforcing structure is set as a rounded corner structure;

[0030] Figure 7 This is a schematic diagram of the assembly structure of the first pole post on the first assembly ring when the first reinforcing structure is set as a chamfered structure.

[0031] Figure 8 This is a schematic diagram of the structure of the first assembly ring when the first reinforcing structure is set as a reinforcing rib;

[0032] Figure 9 This is a schematic diagram of the structure of the first assembly ring when the first reinforcing structure is set as a reinforcing rib and the second reinforcing structure is set as a rounded corner structure;

[0033] Figure 10 This is a schematic diagram of the structure of the first assembly ring when both the first reinforcing structure and the second reinforcing structure are set to rounded corners.

[0034] Figure 11 This is a schematic diagram of the assembly structure of the first assembly ring and the first sealing ring when the first reinforcing structure is set as a rounded corner structure and the second reinforcing structure is set as a rounded corner structure.

[0035] Figure 12 This is a schematic diagram of the structure of the first assembly ring when the first reinforcing structure is set as a reinforcing rib and the second reinforcing structure is set as a chamfered structure;

[0036] Figure 13 This is a schematic diagram of the structure of the first assembly ring when the first reinforcing structure is set as a reinforcing rib and the second reinforcing structure is set as a reinforcing rib;

[0037] Figure 14 This is a schematic diagram of the structure of the first sealing ring;

[0038] Figure 15This is a schematic diagram of the structure of the battery cell of this utility model at the second electrode post;

[0039] In the diagram, Z represents the first direction; 1 is the housing; 11 is the housing body; 111 is the receiving cavity; 112 is the second mounting hole; 113 is the port; 12 is the end cap; 2 is the electrode assembly; 21 is the electrode body; 22 is the first electrode tab; 23 is the second electrode tab; 3 is the first electrode post assembly; 31 is the first assembly ring; 311 is the first extension; 3111 is the first cavity; 3112 is the first axis; 312 is the first limiting part; 313 is the first reinforcing structure; 3131 is the first reinforcing part; 3132 is the second reinforcing part; 314 is the second limiting part; 315 is the second reinforcing structure; and 3151 is the third reinforcing part. 3152, Fourth reinforcing part, 32, First pole post, 33, First sealing ring, 331, First sealing part, 332, Second sealing part, 333, First mounting hole, 334, First mating part, 34, First plastic part, 35, First pressure ring, 36, Second plastic part, 361, Body part, 362, First recess, 3621, Recessed space, 3622, First through hole, 4, Second electrode assembly, 41, Second assembly ring, 411, Second extension part, 4111, Second cavity, 412, Third limiting part, 42, Second pole post, 43, Third plastic part, 44, Second pressure ring. Detailed Implementation

[0040] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0041] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] 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, 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.

[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In the embodiments of the application, "parallel" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is -1° to 1°. "Perpendicular" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is 89° to 91°. Equal distances, equal angles, or equal areas refer to a state in which the tolerance range is -1% to 1%.

[0045] Preferred embodiments of the battery cells in this application, such as... Figures 1 to 15As shown, the battery cell has a first direction Z. The battery cell includes a housing 1, an electrode assembly 2, and a first terminal assembly 3. The housing 1 has a receiving cavity 111. The electrode assembly 2 is disposed in the receiving cavity 111. The first terminal assembly 3 includes a first mounting ring 31 and a first terminal 32. The first mounting ring 31 includes a first extension 311, a first limiting part 312, and a first reinforcing structure 313. The first extension 311 is arranged in a ring shape and passes through the housing 1 along the first direction Z. The first extension 311 has a first cavity 3111. The first limiting part 312 is disposed on the side of the first extension 311 away from the electrode assembly 2 and extends into the first cavity 3111. At least a portion of the first terminal 32 is located in the first cavity 3111, and the first terminal 32 and the first limiting part 312 are engaged in a limiting fit in the first direction Z. During the operation of the battery cell, there is an interaction force between the first electrode post 32 and the first limiting part 312 in the first direction Z. In order to prevent the first limiting part 312 from deforming in the first direction Z due to this force, a first reinforcing structure 313 is added between the first limiting part 312 and the first extension part 311 in this application, thereby improving the connection strength between the first limiting part 312 and the first extension part 311, and improving the ability of the first limiting part 312 to resist deformation in the first direction Z, so as to avoid deformation of the assembly ring at the connection node between the first limiting part 312 and the extension part, thereby ensuring that the first electrode post 32 is firmly connected to the battery casing 1.

[0046] In some embodiments of this application, the first reinforcing structure 313 includes a first reinforcing portion 3131, which is connected to both the first extension portion 311 and the first limiting portion 312, and the first reinforcing portion 3131 extends at least part of the circumferential direction along the first assembly ring 31.

[0047] The first reinforcing part 3131 can be continuously distributed along the circumference of the first assembly ring 31, and the central angle corresponding to the first reinforcing part 3131 is 360°. Alternatively, it can be arranged only along a portion of the circumference of the first assembly ring 31, such as the central angle corresponding to the first reinforcing part 3131 being 90°, 120°, or 180°.

[0048] Specifically, in some embodiments of this application, such as Figure 5 , Figure 6 As shown, the first reinforcing part 3131 is a rounded corner structure located between the first extension part 311 and the first limiting part 312, and the rounded corner structure protrudes towards the inner side of the first assembly ring 31. That is, the rounded corner structure protrudes into the first cavity 3111. This structure enables the first reinforcing part 3131 to have high strength and facilitates the integral molding of the first reinforcing part 3131 onto the assembly ring by die casting.

[0049] In some embodiments of this application, such as Figure 7As shown, the first reinforcing part 3131 can be configured as a chamfered structure arranged circumferentially around the annular first assembly ring 31. The chamfered structure is easy to form, but its strength is lower than that of the rounded corner structure protruding towards the inner side of the assembly ring.

[0050] In some embodiments of this application, such as Figure 8 , Figure 9 As shown, the first reinforcing structure 313 includes second reinforcing portions 3132, which are reinforcing ribs connected to both the first extension portion 311 and the first limiting portion 312. Multiple second reinforcing portions 3132 are provided, and these portions are spaced apart circumferentially along the first assembly ring 31. Specifically, four second reinforcing portions 3132 are provided, evenly spaced along a circumference below the assembly ring, with the central angle corresponding to each portion 3132 being 360°. By configuring the first reinforcing structure 313 as multiple second reinforcing portions 3132, the amount of raw material used in the first assembly ring 31 can be reduced, saving material.

[0051] In some embodiments of this application, the first assembly ring 31 further includes a second limiting portion 314 and a second reinforcing structure 315; the second limiting portion 314 is fixed to the side of the first extension 311 away from the first limiting portion 312, the second limiting portion 314 is located in the receiving cavity 111, and the second limiting portion 314 extends in a direction away from the first cavity 3111; the first pole post assembly 3 further includes a first sealing ring 33, the first sealing ring 33 is elastic, a portion of the first sealing ring 33 is located between the second limiting portion 314 and the housing 1 in the first direction Z, and the second reinforcing structure 315 is disposed between the second limiting portion 314 and the first extension 311.

[0052] The elasticity of the first sealing ring 33 will exert a force in the first direction Z on the second limiting part 314. The strength of the second limiting part 314 can be enhanced by the second reinforcing structure 315 to prevent the second limiting part 314 from deforming in the first direction Z.

[0053] Specifically, such as Figure 4As shown, the first sealing ring 33 has a first sealing portion 331 extending along the first direction Z and a second sealing portion 332 extending perpendicular to the first direction Z; the housing 1 has a second mounting hole 112, the first sealing portion 331 passes through the second mounting hole 112, the first sealing portion 331 has a first mounting hole 333 arranged along the first direction Z, and the first extension portion 311 passes through the first mounting hole 333; the first sealing ring 33 is made of an elastic material such as plastic, the first sealing portion 331 is elastic, and the first sealing portion 331 is disposed in the first extension portion Between the outer side of the first extension 311 and the inner sidewall of the second mounting hole 112, the first sealing part 331 can fill the gap between the first extension 311 and the first mounting hole 333, preventing the first extension 311 from shaking in the radial direction of the first mounting hole 333, and ensuring the stable connection of the assembly ring on the housing 1. The second sealing part 332 is located in the receiving cavity 111. In the first direction Z, one side of the second sealing part 332 abuts against the housing 1 located at the edge of the second mounting hole 112, and the other side of the second sealing part 332 abuts against the second limiting part 314. The second sealing part 332 applies pressure to the second limiting part 314 in the first direction Z. A second reinforcing structure 315 is provided between the second limiting part 314 and the first extension 311 to prevent the second limiting part 314 from deforming under the pressure of the second sealing part 332.

[0054] In some embodiments of this application, the second reinforcing structure 315 is located on the outer periphery of the first assembly ring 31; the second reinforcing structure 315 includes a third reinforcing portion 3151, such as... Figures 9 to 12 As shown, the third reinforcing portion 3151 is connected to both the first extension portion 311 and the second limiting portion 314, and the third reinforcing portion 3151 extends circumferentially around at least a portion of the first assembly ring 31; wherein the third reinforcing portion 3151 can be Figure 12 The chamfered structure shown can also be Figures 9 to 11 The rounded corner structure shown protrudes outward from the extension. By configuring the second reinforcing structure 315 as the third reinforcing part 3151, the strength of the second reinforcing structure 315 can be guaranteed.

[0055] In some embodiments of this application, such as Figure 13 As shown, the second reinforcing structure 315 includes a fourth reinforcing part 3152, which is connected to both the first extension part 311 and the second limiting part 314. The fourth reinforcing part 3152 has multiple portions spaced apart circumferentially along the first assembly ring 31. This structure can save material on the first assembly ring 31.

[0056] In some embodiments of this application, to ensure the sealing performance of the first sealing ring 33 to the first assembly ring 31, the first sealing ring 33 has a first mating portion 334, which matches the second reinforcing structure 315. For example... Figure 11, Figure 14 As shown, when the second reinforcing structure 315 is set as a rounded corner structure, the first mating part 334 is a recess that matches the rounded corner of the rounded corner structure.

[0057] In some embodiments of this application, such as Figure 4 As shown, the first electrode assembly 3 also includes a first plastic part 34, a first pressure ring 35, and a second plastic part 36. Both the first pressure ring 35 and the first plastic part 34 are connected to the first assembly ring 31 and located on the outer periphery of the first assembly ring 31. A portion of the first plastic part 34 is located between the first pressure ring 35 and the housing 1, ensuring a seal between the first pressure ring 35 and the housing 1. Another portion of the first plastic part 34 is located between the first assembly ring 31 and the housing 1, improving the seal between the first assembly ring 31 and the housing 1. The electrode assembly 2 includes an electrode body 21 and a first electrode tab 22 connected to the electrode body 21. The first electrode tab 22 is connected to the first electrode post 3. 2. Electrical connection: The second plastic part 36 is located between the housing 1 and the electrode assembly 2, and is connected to the housing 1; the second plastic part 36 includes a body portion 361 and a first recess 362 connected to the body portion 361. The first recess 362 is recessed towards the side of the electrode assembly 2. The first recess 362 has a recessed space 3621 and a first through hole 3622 communicating with the recessed space 3621. The first through hole 3622 allows the first electrode tab 22 or the first electrode post 32 to pass through; the second limiting part 314 is located between the housing 1 and the first recess 362, and at least a portion of the second limiting part 314 is located in the recessed space 3621. In the first direction Z, one side of the body portion 361 abuts against the housing 1, and the other side abuts against the electrode body 21. The second plastic part 36 can support the housing 1 and the first assembly ring 31 in the first direction Z, so that the pressure applied by the first assembly ring 31 and the housing 1 on the electrode assembly 2 is uniform. Moreover, the second plastic part 36 can fill the gap between the housing 1 and the electrode assembly 2 and the gap between the first assembly ring 31 and the electrode assembly 2, so that the electrode assembly 2, the housing 1 and the first assembly ring 31 are tightly pressed together, preventing the electrode assembly 2 and the first assembly ring 31 from shaking during use.

[0058] In some embodiments of this application, the housing 1 includes a housing body 11 and an end cap 12, a receiving cavity 111 is disposed in the housing body 11, and the end cap 12 is connected to the housing body 11 and seals the receiving cavity 111; the first extension 311 passes through the housing body 11, and the first pole post assembly 3 and the end cap 12 are located on opposite sides of the housing body 11 in the first direction Z.

[0059] Specifically, the assembly method of the battery cell in this application is as follows:

[0060] First, the first sealing ring 33 and the first plastic part 34 are installed at the second mounting hole 112 of the housing 1. Then, the first assembly ring 31 is installed onto the housing 1, so that the first extension 311 passes through the first mounting hole 333. Next, the first pressure ring 35 is sleeved on the outside of the first extension 311, clamping the first pressure ring 35 and the first assembly ring 31 in the first direction Z, so that the second limiting part 314, the first sealing ring 33, the housing 1, the first plastic part 34, and the first pressure ring 35 are tightly fitted in the first direction Z. The inner side of the first pressure ring 35 is welded to the outer side of the first assembly ring 31 by welding. After that, the second plastic part 36 is connected to the housing 1. The housing 1, the first assembly ring 31, the first pressure ring 35, the first sealing ring 33, the first plastic part 34, and the third plastic part 43 are connected into a whole. Then, the first electrode post 32 is inserted into the first cavity 3111, so that the end of the housing 11 connected to the first electrode post 32 faces downward and the opening of the receiving cavity 111 faces upward. The electrode assembly 2 is inserted into the receiving cavity 111, and then the end cap 12 is fixedly connected to the housing 11 to seal the receiving cavity 111, thereby encapsulating the battery cell. After the cap is installed, the periphery of the end of the first electrode post 32 is welded to the periphery of the end of the first extension 311, so that the first assembly ring 31 and the first electrode post 32 are fixedly connected.

[0061] In some embodiments of this application, such as Figure 15 As shown, the battery cell also includes a second terminal assembly 4, and the second terminal assembly 4 and the first terminal assembly 3 are both located on the same side of the housing body 11 in the first direction Z; the second terminal assembly 4 includes a second terminal 42 that passes through the housing body 11, and at least one of the second terminal 42 and the first terminal 32 is insulated from the housing body 11.

[0062] Specifically, in some embodiments of this application, the second electrode assembly 4 further includes a second assembly ring 41, a third plastic part 43, and a second pressure ring 44. The second assembly ring 41 includes a second extension 411 and a third limiting part 412. The second extension 411 is annularly arranged and passes through the housing 1 along the first direction Z. The second extension 411 has a second cavity 4111. The third limiting part 412 is disposed on the side of the second extension 411 away from the electrode assembly 2 and extends into the second cavity 4111. The second electrode 42 passes through the second cavity 4111, and at least a portion of the second electrode 42 is located within the second cavity 4111. The second pole post 42 and the third limiting part 412 are engaged in a limiting fit in the first direction Z, and the second pole post 42 is electrically connected to the second pole lug 23; the second pressure ring 44 and the third plastic part 43 are both connected to the second assembly ring 41 and located on the outer periphery of the second assembly ring 41, a part of the third plastic part 43 is located between the second pressure ring 44 and the housing 1, and another part of the third plastic part 43 is located between the second assembly ring 41 and the housing 1; wherein, the third plastic part 43 is a conductor, so that the second pole post 42 is connected to the housing body 11 through the second pressure ring 44 and the third plastic part 43, and the first plastic part 34 is an insulator, thereby insulating the first pole post 32 from the housing body 11. In other embodiments of this application, both the first plastic part 34 and the third plastic part 43 can be set as insulators.

[0063] In summary, the battery cell of this utility model includes a housing 1, an electrode assembly 2, and a first terminal assembly 3. The housing 1 has a receiving cavity 111, the electrode assembly 2 is disposed in the receiving cavity 111, and the first terminal assembly 3 includes a first mounting ring 31 and a first terminal 32. The first mounting ring 31 includes a first extension 311, a first limiting portion 312, and a first reinforcing portion 3131. The first extension 311 is annularly arranged and passes through the housing 1 along a first direction Z, and has a first cavity 3111. The first limiting portion 312 is disposed on the side of the first extension 311 away from the electrode assembly 2, and extends into the first cavity 3111. At least a portion of the first terminal 32 is located within the first cavity 3111, and the first... The electrode post 32 and the first limiting part 312 are engaged in a limiting fit in the first direction Z. During the operation of the battery cell, there is an interaction force between the first electrode post 32 and the first limiting part 312 in the first direction Z. To prevent this interaction force from causing the first limiting part 312 to deform in the first direction Z, a first reinforcing structure 313 is added between the first limiting part 312 and the first extension 311, thereby improving the connection strength between the first limiting part 312 and the first extension 311, and improving the ability of the first limiting part 312 to resist deformation in the first direction Z. This prevents the first assembly ring 31 from deforming at the connection node between the first limiting part 312 and the extension, thereby ensuring that the first electrode post 32 is firmly connected to the battery casing 1.

[0064] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery cell having a first orientation (Z), characterized in that, include: A housing (1) having a receiving cavity (111); Electrode assembly (2), wherein the electrode assembly (2) is disposed in the receiving cavity (111); The first electrode assembly (3) includes a first mounting ring (31) and a first electrode (32). The first mounting ring (31) includes a first extension (311), a first limiting portion (312), and a first reinforcing structure (313). The first extension (311) is arranged in a ring shape and passes through the housing (1) along the first direction (Z). The first extension (311) has a first cavity (3111). The first limiting portion (312) is disposed on the side of the first extension (311) away from the electrode assembly (2) and extends into the first cavity (3111). At least a portion of the first electrode (32) is located in the first cavity (3111), and the first electrode (32) and the first limiting portion (312) are engaged in the first direction (Z). The first reinforcing structure (313) is disposed between the first extension (311) and the first limiting portion (312).

2. The battery cell according to claim 1, characterized in that, The first reinforcing structure (313) includes a first reinforcing part (3131), which is connected to both the first extension part (311) and the first limiting part (312), and the first reinforcing part (3131) extends circumferentially along at least a portion of the first assembly ring (31).

3. The battery cell according to claim 2, characterized in that, The first reinforcing part (3131) is a rounded corner structure provided between the first extension part (311) and the first limiting part (312), and the rounded corner structure protrudes toward the inner side of the first assembly ring (31).

4. The battery cell according to claim 1, characterized in that, The first reinforcing structure (313) includes a second reinforcing part (3132), which is a reinforcing rib connected to both the first extension part (311) and the first limiting part (312). The second reinforcing part (3132) has a plurality of ribs that are spaced apart circumferentially along the first assembly ring (31).

5. The battery cell according to claim 1, characterized in that, The first assembly ring (31) further includes a second limiting part (314) and a second reinforcing structure (315); the second limiting part (314) is fixed on the side of the first extension (311) away from the first limiting part (312), the second limiting part (314) is located in the receiving cavity (111), and the second limiting part (314) extends in a direction away from the first cavity (3111); The first pole assembly (3) further includes a first sealing ring (33), the first sealing ring (33) is elastic, a portion of the first sealing ring (33) is located in the first direction (Z) between the second limiting portion (314) and the housing (1), and the second reinforcing structure (315) is disposed between the second limiting portion (314) and the first extension portion (311).

6. The battery cell according to claim 5, characterized in that, The second reinforcing structure (315) is located on the outer periphery of the first assembly ring (31); The second reinforcing structure (315) includes a third reinforcing part (3151), which is connected to both the first extension part (311) and the second limiting part (314), and the third reinforcing part (3151) extends circumferentially around at least a portion of the first assembly ring (31); or, the second reinforcing structure (315) includes a fourth reinforcing part (3152), which is connected to both the first extension part (311) and the second limiting part (314), and the fourth reinforcing part (3152) is provided in multiple portions and is spaced apart circumferentially along the first assembly ring (31).

7. The battery cell according to claim 5, characterized in that, The first sealing ring (33) has a first mating part (334) that matches the second reinforcing structure (315).

8. The battery cell according to claim 7, characterized in that, The first pole post assembly (3) further includes a first plastic part (34), a first pressure ring (35), and a second plastic part (36). The first pressure ring (35) and the first plastic part (34) are both connected to the first assembly ring (31) and located on the outer periphery of the first assembly ring (31). A portion of the first plastic part (34) is located between the first pressure ring (35) and the housing (1) in the first direction (Z), and another portion of the first plastic part (34) is located between the first assembly ring (31) and the housing (1). The electrode assembly (2) includes an electrode body (21) and a first tab (22) connected to the electrode body (21). The first tab (22) is electrically connected to the first electrode post (32). The second plastic part (36) is located between the housing (1) and the electrode assembly (2) and is connected to the housing (1). The second plastic part (36) includes a body portion (361) and a first recess (362) provided on the body portion (361). The first recess (362) is recessed toward one side of the electrode assembly (2). The first recess (362) has a recessed space (3621) and a first through hole (3622) communicating with the recessed space (3621). The first through hole (3622) allows the first electrode tab (22) or the first electrode post (32) to pass through. The second limiting portion (314) is located between the housing (1) and the first recess (362), and at least a portion of the second limiting portion (314) is located within the recessed space (3621). In the first direction (Z), one side of the body portion (361) abuts against the housing (1), and the other side abuts against the electrode body (21).

9. The battery cell according to any one of claims 1-8, characterized in that, The housing (1) includes a housing body (11) and an end cap (12). The receiving cavity (111) is disposed on the housing body (11). The end cap (12) is connected to the housing body (11) and seals the receiving cavity (111). The first extension (311) passes through the housing body (11), and the first pole post assembly (3) and the end cap (12) are located on opposite sides of the housing body (11) in the first direction (Z).

10. The battery cell according to claim 9, characterized in that, The battery cell also includes a second terminal assembly (4), and the second terminal assembly (4) and the first terminal assembly (3) are both located on the same side of the shell body (11) in the first direction (Z); The second pole assembly (4) includes a second pole (42) passing through the housing body (11), and at least one of the second pole (42) and the first pole (32) is insulated from the housing body (11).

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