Battery monomer and battery pack

Abstract

The utility model provides a battery monomer and a battery pack, and relates to the technical field of batteries. The single battery comprises a shell, a cover plate connected with the shell, a pole penetrating through the cover plate, a limiting piece comprising a first limiting part and a second limiting part, a sealing piece surrounding the pole, and a reinforcing piece comprising a connecting part and a folding part. The second limiting part is connected with the first limiting part and the side, facing the shell, of the cover plate and surrounds the first limiting part, a limiting groove is formed between the first limiting part and the cover plate, one part of the pole is located in the limiting groove, and one part of the sealing piece is located in the limiting groove and abuts against the pole and the first limiting part. The connecting part is fixedly connected with the side, away from the shell, of the cover plate, and at least part of the turnover part is located in the limiting groove and connected with the cover plate. According to the battery monomer provided by the invention, the mechanical property of the part, located on the pole, of the cover plate is enhanced, so that the pole is unlikely to fall off, and the air tightness of the battery monomer is improved.

Description

Technical Field

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

[0002] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art.

[0003] In existing battery cells, the structure of the portion of the cover plate located at the terminal post is typically relatively weak, making it more susceptible to deformation under the elastic force of the seal. Enhancing the mechanical properties of this portion of the cover plate to improve the airtightness of the battery cell is a pressing issue that needs to be addressed in this field. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery cell and a battery pack, which aims to solve the technical problem of how to enhance the mechanical properties of the portion of the cover plate located at the terminal post in order to improve the airtightness of the battery cell.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, embodiments of this application provide a single battery cell, comprising:

[0007] case;

[0008] Cover plate, connected to the housing;

[0009] The pole is inserted through the cover plate;

[0010] The limiting component includes a first limiting part and a second limiting part connected to each other. The second limiting part is connected to the side of the cover plate facing the housing. The second limiting part is arranged around the first limiting part. A limiting groove is formed between the first limiting part and the cover plate. A portion of the pole post is located in the limiting groove.

[0011] A sealing element is disposed around the pole post, a portion of the sealing element is located within the limiting groove, and the portion of the sealing element located within the limiting groove abuts against the pole post and the first limiting portion;

[0012] The reinforcing member includes a connecting portion and a folding portion connected together. The connecting portion is fixedly connected to the side of the cover plate away from the housing. At least a portion of the folding portion is located within the limiting groove, and the portion of the folding portion located within the limiting groove is connected to the cover plate.

[0013] In one embodiment of the first aspect, the battery cell further includes a first insulating member, a portion of which is disposed between the electrode post and the reinforcing member, a portion of which is located within the limiting groove, and the portion of which is located within the limiting groove is connected to the electrode post and the folded portion.

[0014] In one embodiment of the first aspect, the first insulating member includes a first insulating portion, a second insulating portion, and a third insulating portion connected in sequence. The first insulating portion is connected to the side of the connecting portion away from the sealing member, the second insulating portion is connected between the pole post and the folded portion, and the third insulating portion is located in the limiting groove and is connected to the pole post and the folded portion.

[0015] In one embodiment of the first aspect, the battery cell has a first direction, the electrode post is a positive electrode post, the positive electrode post includes a first electrode post portion, a second electrode post portion and a third electrode post portion connected sequentially along the first direction, the first electrode post portion is located on the side of the third electrode post portion away from the housing, the second electrode post portion is located in the limiting groove, a portion of the first insulating member is disposed between the second electrode post portion and the folded portion, and a portion of the sealing member abuts against the second electrode post portion and the first limiting portion along the first direction.

[0016] In one embodiment of the first aspect, the battery cell has a first direction, the terminal post is a negative terminal post, the negative terminal post includes a first terminal post body and a second terminal post body connected along the first direction, the first terminal post body is located on the side of the second terminal post body away from the housing, a portion of the first terminal post body and a portion of the second terminal post body are located in the limiting groove, a portion of the first insulating member is disposed between the first terminal post body and the folded portion, and the sealing member includes a first sealing portion located in the limiting groove, the first sealing portion abutting against the second limiting portion and the second terminal post body.

[0017] In one embodiment of the first aspect, the battery cell further includes a second insulating member located within the housing and connected to the cover and the limiting member. The sealing member further includes a second sealing portion connected to the first sealing portion, the second sealing portion abutting against the second terminal body and the first limiting portion, and abutting against the second insulating member along the first direction.

[0018] In one embodiment of the first aspect, the cover plate has a mounting groove on the side opposite to the housing, and at least a portion of the connecting portion is located within the mounting groove.

[0019] In one embodiment of the first aspect, the side of the connecting portion away from the bottom wall of the mounting groove is flush with the side of the cover plate away from the bottom wall of the mounting groove.

[0020] In one embodiment of the first aspect, the reinforcing member is made of aluminum or an aluminum alloy.

[0021] Secondly, embodiments of this application provide a battery pack including the battery cells described in any of the embodiments of the first aspect above.

[0022] The beneficial effects of this application are as follows:

[0023] The battery cell provided in this application enhances the mechanical properties of the portion of the cover plate located at the terminal post by providing a limiting member on the cover plate. Simultaneously, a limiting groove is formed between the first limiting part of the limiting member and the cover plate, with a portion of the sealing member located within the limiting groove and the first limiting part of the limiting member abutting against the sealing member, thereby enhancing the stability of the sealing member. Furthermore, by providing a reinforcing member, the connecting part of the reinforcing member is fixedly connected to the side of the cover plate away from the housing. At least a portion of the folded part of the reinforcing member is located within the limiting groove and connected to the cover plate, ensuring that the folded part tightly adheres to the cover plate, further enhancing the mechanical properties of the portion of the cover plate located at the terminal post. This makes it less likely for the terminal post to detach, thereby improving the airtightness of the battery cell.

[0024] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A three-dimensional structural schematic diagram of a battery cell in one embodiment of this application is shown;

[0027] Figure 2 This paper shows a three-dimensional exploded view of a single battery cell in one embodiment of the present application;

[0028] Figure 3 An exploded perspective view of the end cap assembly in one embodiment of this application is shown;

[0029] Figure 4 A three-dimensional structural schematic diagram of the end cap assembly in one embodiment of this application is shown;

[0030] Figure 5 It shows Figure 4 Schematic diagram of the cross-sectional structure at point AA;

[0031] Figure 6 It shows Figure 5 A magnified structural diagram of region B in the middle;

[0032] Figure 7 It shows Figure 5 A magnified structural diagram of region C in the middle;

[0033] Figure 8 This invention provides a perspective view of the end cap in one embodiment of the present application when its first limiting portion is not folded over.

[0034] Figure 9 This invention provides a three-dimensional structural diagram of the reinforcing member in one embodiment of the present application when its folded portion is not folded.

[0035] Figure 10 It shows Figure 9 A schematic diagram of the cross-sectional structure at point DD.

[0036] Explanation of key component symbols:

[0037] 1000 - Battery cell; 100 - End cap assembly; 110 - End cap; 111 - Cover plate; 112 - Limiting component; 1121 - First limiting part; 1122 - Second limiting part; 1123 - Limiting groove; 113 - Mounting groove; 120 - Terminal post; 121 - First terminal post part; 122 - Second terminal post part; 123 - Third terminal post part; 1201 - First terminal post body; 1202 - Second terminal post body; 130 - Seal; 131-First sealing part; 132-Second sealing part; 140-Reinforcing member; 141-Connecting part; 142-Folding part; 150-First insulating member; 151-First insulating part; 152-Second insulating part; 153-Third insulating part; 160-Second insulating member; 200-Housing; 210-Opening cavity; 300-Electrode assembly; 400-Insulating film; 500-Adapter piece; Z-First direction. Detailed Implementation

[0038] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0039] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this application.

[0040] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above," "on top of," and "over" the second feature can mean that the first feature is 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 can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or hierarchy, or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0042] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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.

[0043] In the description of this application, the term "and / or" indicates that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0044] In the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0045] In existing battery cells, the structure of the portion of the cover plate located at the terminal post is typically relatively weak. Under the elastic force of the sealing element, it is more prone to deformation, causing the terminal post to detach from the cover plate and thus affecting the airtightness of the battery cell. How to enhance the mechanical properties of the portion of the cover plate located at the terminal post to improve the airtightness of the battery cell is a problem that urgently needs to be solved in this field.

[0046] To address the aforementioned technical problems, firstly, embodiments of this application provide a single battery cell, relating to the field of battery technology, primarily used in battery packs for application in electrical devices or energy storage devices. Of course, the single battery cell can also be directly applied to electrical devices or energy storage devices without using a battery pack; therefore, no specific limitations are placed on the application scenarios of the single battery cell.

[0047] For example, electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, and new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, and range-extended electric vehicles; spacecraft can be airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools can be metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers; energy storage devices can be energy storage containers and energy storage power stations. No specific restrictions are placed on the types of electrical devices and energy storage devices here.

[0048] like Figure 1 as well as Figures 3 to 5 As shown, the battery cell 1000 provided in this embodiment includes: a housing 200, a cover plate 111, a terminal post 120, a limiting member 112, a sealing member 130, and a reinforcing member 140.

[0049] The cover plate 111 is connected to the housing 200; the pole post 120 is disposed through the cover plate 111; the limiting member 112 includes a first limiting part 1121 and a second limiting part 1122 connected to each other, the second limiting part 1122 is connected to the side of the cover plate 111 facing the housing 200, the second limiting part 1122 is disposed around the first limiting part 1121, a limiting groove 1123 is formed between the first limiting part 1121 and the cover plate 111, and a part of the pole post 120 is located in the limiting groove 1123; the sealing member 130 surrounds... The pole post 120 is provided, a portion of the seal 130 is located in the limiting groove 1123, and the portion of the seal 130 located in the limiting groove 1123 abuts against the pole post 120 and the first limiting part 1121; the reinforcing member 140 includes a connecting part 141 and a folding part 142 connected to each other, the connecting part 141 is fixedly connected to the side of the cover plate 111 away from the housing 200, at least a portion of the folding part 142 is located in the limiting groove 1123, and the portion of the folding part 142 located in the limiting groove 1123 is connected to the cover plate 111.

[0050] For example, the seal 130 can be integrally molded from materials such as rubber, silicone, or sponge, without any specific limitations.

[0051] It should be noted that the fixed connection between the connecting part 141 and the cover plate 111 can be understood as the relative positions of the cover plate 111 and the connecting part 141 remaining unchanged under normal use conditions, that is, they will not easily separate or move relative to each other; for example, the fixed connection can be welding, bonding, injection molding, etc., and no specific limitation is made here.

[0052] It is understood that the battery cell 1000 provided in this embodiment enhances the mechanical properties of the portion of the cover plate 111 located at the terminal post 120 by providing a limiting member 112 on the cover plate 111. Simultaneously, a limiting groove 1123 is formed between the first limiting portion 1121 of the limiting member 112 and the cover plate 111. A portion of the sealing member 130 is located within the limiting groove 1123, and the first limiting portion 1121 of the limiting member 112 abuts against the sealing member 130, thereby enhancing the stability of the sealing member 130. Based on this, by setting the reinforcing member 140, the connecting part 141 of the reinforcing member 140 is fixedly connected to the side of the cover plate 111 away from the housing 200. At least part of the folding part 142 of the reinforcing member 140 is located in the limiting groove 1123 and connected to the cover plate 111, so that the folding part 142 is tightly attached to the cover plate 111, thereby further enhancing the mechanical properties of the part of the cover plate 111 located at the pole post 120, thereby making the pole post 120 less likely to fall off, and thus improving the airtightness of the battery cell 1000.

[0053] It should be noted that the folded portion 142 can be at least partially located within the limiting groove 1123 and connected to the cover plate 111 by a riveting and flanging process. The structure of the reinforcing member 140 when its folded portion 142 is not folded is as follows: Figure 9 and Figure 10 As shown, the structure of the reinforcing member 140 after its folded portion 142 is as follows: Figures 5 to 7 As shown. Furthermore, the reinforcing member 140 can be made of aluminum, so that the reinforcing member 140 has properties such as light weight, easy shaping, and oxidation resistance. This not only reduces the adverse effect on the energy density of the battery cell 1000 after adding the reinforcing member 140 to the cover plate 111, but also makes it easier to rivet and fold the edges to form a folded part 142 that is tightly attached to the cover plate 111. Of course, the folded part 142 can also be made by injection molding so that at least part of it is located in the limiting groove 1123 and connected to the cover plate 111. Here, no specific restrictions are placed on the folding method of the folded part 142.

[0054] Furthermore, the first limiting part 1121 can also form a limiting groove 1123 between the first limiting part 1121 and the cover plate 111 through a riveting and flanging process. The structure of the end cover 110 when its first limiting part 1121 is not folded is as follows: Figure 8 As shown, the structure of the end cap 110 after its first limiting portion 1121 is folded down is as follows: Figures 5 to 7 As shown; of course, the first limiting part 1121 can also form a limiting groove 1123 between the first limiting part 1121 and the cover plate 111 through injection molding process. Here, no specific restrictions are made on the formation method of the limiting groove 1123.

[0055] like Figures 3 to 6 As shown, in one embodiment, the battery cell 1000 further includes a first insulating member 150. A portion of the first insulating member 150 is disposed between the terminal post 120 and the reinforcing member 140. A portion of the first insulating member 150 is located within a limiting groove 1123, and the portion of the first insulating member 150 located within the limiting groove 1123 is connected to the terminal post 120 and the folded portion 142. In this way, the first insulating member 150 can achieve insulation between the terminal post 120 and the folded portion 142, and can also support the terminal post 120, making the terminal post 120 more stable and less likely to fall off the cover plate 111.

[0056] like Figures 3 to 6 As shown, the first insulating member 150 further includes a first insulating part 151, a second insulating part 152 and a third insulating part 153 connected in sequence. The first insulating part 151 is connected to the side of the connecting part 141 away from the sealing member 130. The second insulating part 152 is connected between the pole post 120 and the folded part 142. The third insulating part 153 is located in the limiting groove 1123 and is connected to the pole post 120 and the folded part 142.

[0057] It is understood that by sequentially connecting the first insulating part 151, the second insulating part 152, and the third insulating part 153, the first insulating part 151 insulates the pole post 120 from the connecting part 141, while the second insulating part 152 and the third insulating part 153 insulate the pole post 120 from the connecting part 141 and from the folding part 142, thus achieving insulation between the pole post 120 and the reinforcing member 140. Moreover, the first insulating part 151, the second insulating part 152, and the third insulating part 153 form a stable support for the pole post 120.

[0058] It should be noted that the first insulating member 150 can be made of materials with insulating properties such as plastic or ceramic, for example, by integral injection molding of plastic, so that the first insulating member 150 is fixedly connected to the connecting part 141, the folding part 142 and the pole post 120; of course, the first insulating member 150 can also be made to abut against the connecting part 141, the folding part 142 and the pole post 120 by means of component assembly. Both of the above methods can achieve insulation between the pole post 120 and the reinforcing member 140, and no specific restrictions are placed on the connection method between the first insulating member 150 and the pole post 120 and the reinforcing member 140.

[0059] like Figures 4 to 6 As shown, in a specific embodiment, the battery cell 1000 has a first direction Z, and the terminal post 120 is a negative terminal post. The negative terminal post includes a first terminal post body 1201 and a second terminal post body 1202 connected along the first direction Z. The first terminal post body 1201 is located on the side of the second terminal post body 1202 away from the housing 200. A part of the first terminal post body 1201 and a part of the second terminal post body 1202 are located in the limiting groove 1123. A part of the first insulating member 150 is disposed between the first terminal post body 1201 and the folded portion 142 to achieve insulation between the first terminal post body 1201 and the folded portion 142. The sealing member 130 includes a first sealing portion 131 located in the limiting groove 1123. The first sealing portion 131 abuts against the second limiting portion 1122 and the second terminal post body 1202 to seal the gap between the second terminal post body 1202 and the second limiting portion 1122 to achieve sealing.

[0060] For example, the first electrode body 1201 is made of aluminum, and the second electrode body 1202 is made of copper. The two can be connected by a solid-liquid composite process; of course, they can also be connected by friction welding. No specific limitations are placed on the connection method between the first electrode body 1201 and the second electrode body 1202. It should be noted that compared to friction welding, solid-liquid composite technology can reduce the failure rate at the copper-aluminum interface, and the electrode 120 formed by solid-liquid composite technology occupies less space, which is beneficial to improving the energy density of the battery cell 1000.

[0061] like Figure 2 as well as Figures 5 to 7 As shown, the battery cell 1000 further includes a second insulating member 160, which is located inside the housing 200 and connected to the cover plate 111 and the limiting member 112 to achieve insulation between the cover plate 111 and the electrode assembly 300 disposed in the housing 200; at the same time, the sealing member 130 also includes a second sealing part 132 connected to the first sealing part 131, which abuts against the second electrode body 1202 and the first limiting part 1121, and abuts against the second insulating member 160 along the first direction Z to seal the gap between the negative electrode and the limiting member 112, and to seal the gap between the second insulating member 160 and the negative electrode.

[0062] like Figure 4 , Figure 5 and Figure 7 As shown, in another specific embodiment, the battery cell 1000 has a first direction Z, and the terminal post 120 is a positive terminal post. The positive terminal post includes a first terminal post portion 121, a second terminal post portion 122, and a third terminal post portion 123 connected sequentially along the first direction Z. The first terminal post portion 121 is located on the side of the third terminal post portion 123 away from the housing 200. The second terminal post portion 122 is located in the limiting groove 1123. A portion of the first insulating member 150 is disposed between the second terminal post portion 122 and the folded portion 142 to achieve insulation between the second terminal post portion 122 and the folded portion 142. At the same time, a portion of the sealing member 130 abuts against the second terminal post portion 122 and the first limiting portion 1121 along the first direction Z to seal the gap between the second terminal post portion 122 and the limiting member 112.

[0063] like Figure 4 , Figure 5 and Figure 7 As shown, it should be noted that when the first insulating member 150 includes a first insulating part 151, a second insulating part 152, and a third insulating part 153 connected in sequence, the first insulating part 151 is connected to the connecting part 141 and the first pole post part 121, the second insulating part 152 is connected to the second pole post part 122 and the folding part 142, and the third insulating part 153 is connected to the second pole post part 122 and the cover plate 111 to achieve insulation between the positive pole post and the reinforcing member 140, as well as insulation between the positive pole post and the cover plate 111; at the same time, the sealing member 130 abuts against the second limiting part 1122, the second pole post part 122, and the third pole post part 123 to seal the gap between the positive pole post and the limiting member 112.

[0064] like Figures 4 to 7 As shown, in one embodiment, the cover plate 111 is provided with a mounting groove 113 on the side opposite to the housing 200, and at least a portion of the connecting portion 141 is located in the mounting groove 113.

[0065] Understandably, by setting the mounting groove 113, the reinforcing member 140 can be quickly positioned when it is installed, thus improving the installation efficiency of the reinforcing member 140. At the same time, the groove wall of the mounting groove 113 can restrict the movement of the reinforcing member 140 relative to the cover plate 111, thereby enhancing the stability of the connection between the reinforcing member 140 and the cover plate 111.

[0066] like Figures 4 to 7 As shown, furthermore, the side of the connecting portion 141 facing away from the bottom wall of the mounting groove 113 is flush with the side of the cover plate 111 facing away from the bottom wall of the mounting groove 113. This can effectively improve the situation where the reinforcing member 140 protrudes from the surface of the cover plate 111, reduce the space occupied by the reinforcing member 140, improve the energy density of the battery cell 1000, and at the same time make the surface of the cover plate 111 flatter and more aesthetically pleasing.

[0067] In summary, the battery cell 1000 includes an end cap assembly 100, an electrode assembly 300, an insulating film 400, an adapter piece 500, and a housing 200. The housing 200 has an opening 210. The end cap assembly 100 includes an end cap 110, a terminal post 120, a seal 130, a reinforcing member 140, a first insulating member 150, and a second insulating member 160. The end cap 110 includes a cover plate 111 and a limiting member 112 connected together. The cover plate 111 is connected to the housing 200 to cover the opening 210. The terminal post 120 is disposed through the cover plate 111. The seal 130 is disposed around the terminal post 120. The limiting member 112 includes a first limiting portion 1121 and a second limiting portion 1122 connected together. The second limiting portion 1122 is disposed around the first limiting portion 1121. A limiting groove 1123 is formed between the first limiting portion 1121 and the cover plate 111. A portion of the terminal post 120 is located in the limiting groove. Within the groove 1123, a portion of the sealing member 130 is located within the limiting groove 1123 and abuts against the pole post 120 and the first limiting part 1121. The reinforcing member 140 includes a connecting part 141 and a folding part 142 connected together. The connecting part 141 is fixedly connected to the cover plate 111. At least a portion of the folding part 142 is located within the limiting groove 1123 and is connected to the cover plate 111. The electrode assembly 300 is disposed within the opening 210. An insulating film 400 is disposed around the electrode assembly 300. The first insulating member 150 is located outside the opening 210. A portion of the first insulating member 150 is disposed between the reinforcing member 140 and the pole post 120. The second insulating member 160 is located within the opening 210 and is connected to the cover plate 111 and the limiting member 112. The adapter piece 500 is connected between the pole post 120 and the electrode assembly 300 to achieve an electrical connection between the pole post 120 and the electrode assembly 300.

[0068] For example, the assembly process of the end cap assembly 100 may be as follows: the reinforcing member 140 (when not folded) is inserted through the cover plate 111 along the first direction Z of the cover plate 111; then the folded portion 142 of the reinforcing member 140 is riveted and folded so that at least a portion of the folded portion 142 is located in the limiting groove 1123 and connected to the cover plate 111; the pole post 120 is inserted through the cover plate 111 and the sealing member 130 is placed therein; then the first limiting portion 1121 of the limiting member 112 is riveted and folded so that the first limiting portion 1121 abuts against the sealing member 130; the portion of the connecting portion 141 located at the groove opening of the mounting groove 113 of the cover plate 111 is welded to the cover plate 111; then the first insulating member 150 is injection molded, and finally the first insulating member 150, the reinforcing member 140, and the limiting member 112 jointly control the compression amount of the sealing member 130.

[0069] Secondly, embodiments of this application provide a battery pack including the battery cell 1000 in any of the embodiments of the first aspect described above.

[0070] It is understood that since the battery pack provided in this embodiment has the battery cell 1000 in any of the embodiments of the first aspect, it has all the beneficial effects of the battery cell 1000, which will not be described in detail here.

[0071] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0072] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery cell, characterized by, The battery monomer comprises a shell (200), a cover plate (111) connected with the shell (200), a pole column (120) penetrating through the cover plate (111), a limiting piece (112) comprising a first limiting part (1121) and a second limiting part (1122) connected with each other, the second limiting part (1122) being connected with a side of the cover plate (111) facing the shell (200), the second limiting part (1122) being arranged around the first limiting part (1121), a limiting groove (1123) being formed between the first limiting part (1121) and the cover plate (111), a part of the pole column (120) being located in the limiting groove (1123), a sealing piece (130) being arranged around the pole column (120), a part of the sealing piece (130) being located in the limiting groove (1123), and the part of the sealing piece (130) located in the limiting groove (1123) abutting against the pole column (120) and the first limiting part (1121), a reinforcing piece (140) comprising a connecting part (141) and a folded part (142) connected with each other, the connecting part (141) being fixedly connected with a side of the cover plate (111) away from the shell (200), at least a part of the folded part (142) being located in the limiting groove (1123), and the part of the folded part (142) located in the limiting groove (1123) being connected with the cover plate (111). The battery monomer further comprises a first insulating piece (150), a part of the first insulating piece (150) being arranged between the pole column (120) and the reinforcing piece (140), a part of the first insulating piece (150) being located in the limiting groove (1123), and the part of the first insulating piece (150) located in the limiting groove (1123) being connected with the pole column (120) and the folded part (142). The first insulating piece (150) comprises a first insulating part (151), a second insulating part (152) and a third insulating part (153) connected in sequence, the first insulating part (151) being connected with a side of the connecting part (141) away from the sealing piece (130), the second insulating part (152) being connected between the pole column (120) and the folded part (142), and the third insulating part (153) being located in the limiting groove (1123) and connected with the pole column (120) and the folded part (142). ​ ​ ​ ​ 2. The battery cell of claim 1, wherein, ​ 3. The battery cell of claim 2, wherein, ​ 4. The battery cell of claim 2, wherein, The battery monomer has a first direction (Z), the pole column (120) is a positive pole column, the positive pole column comprises a first pole column part (121), a second pole column part (122) and a third pole column part (123) connected in sequence along the first direction (Z), the first pole column part (121) is located on the side of the third pole column part (123) away from the shell (200), the second pole column part (122) is located in the limiting groove (1123), a part of the first insulating part (150) is arranged between the second pole column part (122) and the folded part (142), and the sealing part (130) is in abutment with the second pole column part (122) and the first limiting part (1121) along the first direction (Z).

5. The battery cell of claim 2, wherein, The battery monomer has a first direction (Z), the pole column (120) is a negative pole column, the negative pole column comprises a first pole column body (1201) and a second pole column body (1202) connected along the first direction (Z), the first pole column body (1201) is located on the side of the second pole column body (1202) away from the shell (200), a part of the first pole column body (1201) and a part of the second pole column body (1202) are located in the limiting groove (1123), a part of the first insulating part (150) is arranged between the first pole column body (1201) and the folded part (142), and the sealing part (130) comprises a first sealing part (131) located in the limiting groove (1123), and the first sealing part (131) is in abutment with the second limiting part (1122) and the second pole column body (1202).

6. The battery cell of claim 5, wherein, The battery monomer further comprises a second insulating part (160) located in the shell (200) and connected with the cover plate (111) and the limiting part (112), and the sealing part (130) further comprises a second sealing part (132) connected with the first sealing part (131), the second sealing part (132) is in abutment with the second pole column body (1202) and the first limiting part (1121) and in abutment with the second insulating part (160) along the first direction (Z).

7. The battery cell of claim 1, wherein, The cover plate (111) is provided with a mounting groove (113) on the side away from the shell (200), and at least part of the connecting part (141) is located in the mounting groove (113).

8. The battery cell of claim 7, wherein, The side of the connecting part (141) away from the bottom wall of the mounting groove (113) is arranged flush with the side of the cover plate (111) away from the bottom wall of the mounting groove (113).

9. The battery cell of claim 1, wherein, The material of the reinforcing part (140) is aluminum or aluminum alloy.

10. A battery pack, characterized by, The battery monomer comprises any one of claims 1 to 9.

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