Battery cell and battery pack

Abstract

The utility model discloses a battery cell and a battery pack, the battery cell has a height direction, and the battery cell comprises a top cover assembly. The top cover assembly comprises a top cover, a first insulating part, a pole, a limiting part and a heat insulation part; the first insulating part is located on one side of the top cover in the height direction. The pole part sequentially penetrates through the top cover and the first insulating part along the height direction; the limiting piece is located on the side, away from the first insulating piece, of the top cover in the height direction, the limiting piece comprises a first limiting part and a second limiting part surrounding the first limiting part, the second limiting part is connected with the top cover and surrounds the pole, and the first limiting part and the top cover form a limiting groove in the height direction and clamp the pole; the heat insulation piece comprises a first heat insulation structure, the first heat insulation structure is located in the limiting groove and located between the pole and the second limiting part, and the first heat insulation structure is a rubber heat insulation structure. According to the battery monomer, the manufacturing cost can be reduced.

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] A power battery is a power source that provides power to tools, and it often refers to the storage battery that powers electric vehicles, electric trains, electric bicycles, and golf carts. Power batteries are the core component of new energy vehicles. However, the current manufacturing process of power batteries still faces the problem of high production costs. Utility Model Content

[0003] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a battery cell that can reduce manufacturing costs.

[0004] This application also provides a battery pack.

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

[0006] According to a first aspect embodiment of the present application, the battery cell has a height direction and includes: a top cover assembly, the top cover assembly including a top cover, a first insulating member, a terminal post, a limiting member, and a heat insulation member; the first insulating member is located on one side of the top cover along the height direction; the terminal post portion is sequentially inserted through the top cover and the first insulating member along the height direction; the limiting member is located on the side of the top cover away from the first insulating member along the height direction, the limiting member including a first limiting portion and a second limiting portion surrounding the first limiting portion, the second limiting portion connecting the top cover and surrounding the terminal post, the first limiting portion and the top cover forming a limiting groove in the height direction and clamping the terminal post; the heat insulation member includes a first heat insulation structure, the first heat insulation structure being located within the limiting groove and between the terminal post and the second limiting portion, the first heat insulation structure being a rubber heat insulation structure.

[0007] The battery cell of this application has the following advantages:

[0008] In the battery cell of this application, the terminal post is sequentially inserted through the top cover and the first insulating member along the height direction, so that the terminal post is electrically connected to the electrode assembly of the battery cell. During this process, since the second limiting part of the limiting member connects to the top cover and surrounds the terminal post, the first limiting part of the limiting member and the top cover form a limiting groove in the height direction and clamp the terminal post. Thus, at least a portion of the terminal post can be fixed between the limiting member and the top cover through the cooperation of the second limiting part and the limiting groove, thereby fixing the terminal post. Simultaneously, the first insulating member insulates the top cover from the electrode assembly of the battery cell, preventing the top cover from contacting the battery cell. Short circuits or electric shocks may occur due to contact between the electrode components. Furthermore, since the first heat insulation structure of the heat insulation component is located within the limiting groove and between the electrode post and the second limiting part, thermal isolation between the electrode post and the top cover assembly can be achieved through the heat insulation component when welding the electrode post and the electrode component. Moreover, since the first heat insulation structure is a rubber heat insulation structure, and rubber is cheaper than liquid crystal polymers, and rubber has the advantages of high temperature resistance and insulation, the heat insulation component with the first heat insulation structure being a rubber heat insulation structure can meet the requirements of manufacturing cost, thermal isolation, and insulation. Therefore, the battery cell of this application has a lower manufacturing cost.

[0009] According to the battery cell of the first aspect of this application, the battery cell further has a length direction intersecting the height direction, the heat insulation member further includes a second heat insulation structure, the second heat insulation structure surrounds the electrode post, the second heat insulation structure is connected to the first heat insulation structure along the length direction, the second heat insulation structure abuts against the electrode post and the top cover along the height direction, and the second heat insulation structure is a rubber heat insulation structure.

[0010] According to a battery cell of a first aspect of this application, the second heat insulation structure includes a connecting portion and a sleeve portion, the sleeve portion surrounding the electrode post, the connecting portion connecting to the first heat insulation structure and the sleeve portion along the length direction, and the connecting portion abutting against the electrode post and the top cover along the height direction.

[0011] According to the battery cell of the first aspect of this application, the first heat insulation structure and the second heat insulation structure are integrally formed.

[0012] According to the battery cell of the first aspect of this application, the top cover assembly further includes a second insulating member, the second insulating member being located on the side of the top cover away from the first insulating member, and the second insulating member covering the limiting member, the second insulating member having a filling portion abutting against the first limiting portion and the terminal post, and abutting against the first heat insulation structure.

[0013] According to a first aspect embodiment of the present application, the battery cell includes a first post and a second post connected in the height direction, the second post being close to the first insulating member, the second heat insulation structure abutting against the second post and the top cover along the height direction, the first post being close to the second insulating member, and the filling portion abutting against the first post along the height direction.

[0014] According to a first aspect embodiment of the present application, the battery cell further has a length direction intersecting the height direction, and the top cover assembly further includes a seal, the seal surrounding the terminal post, the seal being spaced apart from the first heat insulation structure along the length direction, and the seal abutting against the terminal post and the top cover along the height direction.

[0015] According to the battery cell of the first aspect of this application, the battery cell further has a length direction intersecting the height direction, and the heat insulation member further includes a third heat insulation structure, the third heat insulation structure being connected to the first heat insulation structure along the length direction and located between the first limiting portion and the electrode post along the height direction, the third heat insulation structure being a rubber heat insulation structure.

[0016] According to a first aspect embodiment of the battery cell, the electrode post has a protrusion, the protrusion being partially located within the limiting groove, and the first heat insulation structure being located between the protrusion and the second limiting portion.

[0017] A battery pack according to a second aspect of this application includes: a battery cell as described above.

[0018] The battery pack of this application has the following advantages:

[0019] In the battery pack of this application, since the aforementioned battery cells have a low manufacturing cost, the battery pack of this application can have a low manufacturing cost. Attached Figure Description

[0020] 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.

[0021] Figure 1 An exploded view of the top cover assembly in this application is shown;

[0022] Figure 2 A cross-sectional view of the battery cell of Embodiment 1 in this application is shown;

[0023] Figure 3 It shows Figure 2 Enlarged structural diagram at point A;

[0024] Figure 4 A cross-sectional view of the battery cell in Embodiment 2 of this application is shown.

[0025] Figure 5 It shows Figure 4 Enlarged structural diagram at point B;

[0026] Figure 6 A schematic cross-sectional view of the battery cell in Embodiment 3 of this application is shown. Figure 1 ;

[0027] Figure 7 It shows Figure 6 Enlarged structural diagram at point C;

[0028] Figure 8 A schematic cross-sectional view of the battery cell in Embodiment 3 of this application is shown. Figure 2 ;

[0029] Figure 9 It shows Figure 8 Enlarged structural diagram at point D;

[0030] Figure 10 A cross-sectional view of the battery cell in Embodiment 4 of this application is shown.

[0031] Figure 11 It shows Figure 10 Enlarged structural diagram at point E;

[0032] Figure 12 A schematic diagram of the pole structure in this application is shown.

[0033] Explanation of key component symbols:

[0034] 100-Top cover assembly; 110-Top cover; 120-First insulating component; 130-Electrical post; 131-First post portion; 132-Second post portion; 133-Protrusion; 1331-First protrusion; 1332-Second protrusion; 140-Limiting component; 141-First limiting portion; 142-Second limiting portion; 143-Limiting groove; 150-Heat insulation component; 151-First heat insulation structure; 1511-First heat insulation portion; 1512-Second heat insulation portion; 152-Second heat insulation structure; 1521-Connecting portion; 1522-Sleeve portion; 153-Third heat insulation structure; 154-Liquid crystal polymer layer; 155-Polyphenylene sulfide layer; 160-Second insulating component; 161-Filling portion; 170-Sealing component;

[0035] 200-Electrode assembly;

[0036] x - height direction; y - length direction. Detailed Implementation

[0037] The embodiments of this application are described in detail below. Examples of these 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.

[0038] 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", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship 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.

[0039] 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 technical features indicated. Thus, a feature defined as "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 specified.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "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.

[0041] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "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 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 that the first feature is at a lower horizontal level than the second feature.

[0042] Reference Figure 1 as well as Figure 3 As shown, the battery cell involved in the embodiments of this application has a height direction x, and the battery cell includes: a top cover assembly 100.

[0043] Specifically, the top cover assembly 100 includes a top cover 110, a first insulating member 120, a pole post 130, a limiting member 140, and a heat insulation member 150; the first insulating member 120 is located on one side of the top cover 110 along the height direction x; the pole post 130 is partially inserted into the top cover 110 and the first insulating member 120 along the height direction x; the limiting member 140 is located on the side of the top cover 110 away from the first insulating member 120 along the height direction x, and the limiting member 140 includes a first limiting portion 141. The first limiting part 141 and the second limiting part 142 surround the first limiting part 141. The second limiting part 142 connects to the top cover 110 and surrounds the pole post 130. The first limiting part 141 and the top cover 110 form a limiting groove 143 in the height direction x and clamp the pole post 130. The heat insulation member 150 includes a first heat insulation structure 151, which is located in the limiting groove 143 and between the pole post 130 and the second limiting part 142. The first heat insulation structure 151 is a rubber heat insulation structure.

[0044] Specifically, the battery cell also includes an electrode assembly 200, which is spaced apart from the top cover assembly 100 along the height direction x. The first insulating member 120 is located on the side of the top cover 110 close to the electrode assembly 200 along the height direction x. The terminal post 130 is sequentially inserted through the top cover 110 and the first insulating member 120 along the height direction x and is electrically connected to the electrode assembly 200.

[0045] It should be noted that the height direction x is Figure 3 The direction indicated by x in the middle.

[0046] In the battery cell of this application, the terminal post 130 is sequentially inserted through the top cover 110 and the first insulating member 120 along the height direction x, so that the terminal post 130 is electrically connected to the electrode assembly 200 of the battery cell. During this process, since the second limiting portion 142 of the limiting member 140 connects to the top cover 110 and surrounds the terminal post 130, and the first limiting portion 141 of the limiting member 140 and the top cover 110 form a limiting groove 143 in the height direction x, clamping the terminal post 130, at least a portion of the terminal post 130 can be fixed between the limiting member 140 and the top cover 110 through the cooperation of the second limiting portion 142 and the limiting groove 143, thus fixing the terminal post 130. Simultaneously, the first insulating member 120 can be used to connect the top cover 110 and the electrode assembly 200 of the battery cell. Insulation is provided to prevent short circuits or electric shocks caused by contact between the top cover 110 and the electrode assembly 200 of the battery cell. Furthermore, since the first heat insulation structure 151 of the heat insulation component 150 is located within the limiting groove 143 and between the electrode post 130 and the second limiting part 142, thermal isolation between the electrode post 130 and the top cover assembly 100 can be achieved through the heat insulation component 150 when welding the electrode post 130 and the electrode assembly 200. Moreover, since the first heat insulation structure 151 is a rubber heat insulation structure, and rubber is cheaper than liquid crystal polymers, and rubber has the advantages of high temperature resistance and insulation, the heat insulation component 150 with the first heat insulation structure 151 being a rubber heat insulation structure can meet the requirements of manufacturing cost, thermal isolation, and insulation. Therefore, the battery cell of this application has a lower manufacturing cost.

[0047] Example 1

[0048] Reference Figure 2 as well as Figure 3 As shown, in Embodiment 1, the battery cell also has a length direction y intersecting the height direction x. The heat insulation component 150 also includes a second heat insulation structure 152, which surrounds the electrode post 130. The second heat insulation structure 152 is connected to the first heat insulation structure 151 along the length direction y. The second heat insulation structure 152 abuts against the electrode post 130 and the top cover 110 along the height direction x. The second heat insulation structure 152 is a rubber heat insulation structure.

[0049] It should be noted that the length direction y is Figure 3 The direction indicated by y in the middle.

[0050] In this embodiment, since the second heat insulation structure 152 surrounds the pole post 130 and abuts against the pole post 130 and the top cover 110 along the height direction x, the second heat insulation structure 152 can thermally insulate the end of the pole post 130 near the first insulating member 120 from the top cover 110. At the same time, since the second heat insulation structure 152 is connected to the first heat insulation structure 151 along the length direction y, the heat insulation gap between the pole post 130 and the top cover 110 can be reduced. The heat insulation effect between the pole post 130 and the top cover 110 is achieved through the cooperation of the second heat insulation structure 152 and the first heat insulation structure 151, reducing the impact of the welding process of the pole post 130 and the electrode assembly 200 on the top cover assembly 100. Since the second heat insulation structure 152 is a rubber heat insulation structure, the manufacturing cost of the heat insulation member 150 can be further reduced.

[0051] Reference Figure 3 As shown, in Embodiment 1, the second heat insulation structure 152 includes a connecting portion 1521 and a sleeve portion 1522. The sleeve portion 1522 surrounds the pole post 130. The connecting portion 1521 is connected to the first heat insulation structure 151 and the sleeve portion 1522 along the length direction y, and the connecting portion 1521 abuts against the pole post 130 and the top cover 110 along the height direction x.

[0052] In this embodiment, when the electrode post 130 is welded to the electrode assembly 200, the temperature is highest at the portion of the electrode post 130 that passes through the top cover 110 and the first insulating member 120. Therefore, the portions of the top cover 110 and the first insulating member 120 that contact the electrode post 130 are most susceptible to the high welding temperature. Since the sleeve portion 1522 surrounds the electrode post 130, the sleeve portion 1522 can thermally insulate the portions of the electrode post 130 and the top cover 110 that contact the first insulating member 120, thereby reducing the temperature. The low welding temperature affects the top cover 110 and the first insulating component 120. At the same time, since the connecting part 1521 is connected to the first heat insulation structure 151 and the sleeve part 1522 along the length direction y, and the connecting part 1521 abuts against the pole post 130 and the top cover 110 along the height direction x, the first heat insulation structure 151 and the second heat insulation structure 152 can be connected through the connecting part 1521 to improve the thermal insulation effect of the top cover 110 at the position corresponding to the pole post 130 in the height direction x.

[0053] Continue to refer to Figure 3 As shown, in Embodiment 1, the first heat insulation structure 151 and the second heat insulation structure 152 are integrally formed.

[0054] In this embodiment, since the first heat insulation structure 151 and the second heat insulation structure 152 are integrally formed, the assembly difficulty between the top cover assembly 100 and the pole post 130 can be reduced. At the same time, the integrally formed first heat insulation structure 151 and second heat insulation structure 152 can reduce the installation gap between the first heat insulation structure 151 and the second heat insulation structure 152, thereby improving the heat insulation effect of the first heat insulation structure 151 and the second heat insulation structure 152, that is, improving the heat insulation effect of the heat insulation component 150.

[0055] Reference Figure 3 As shown, in Embodiment 1, the top cover assembly 100 further includes a second insulating member 160. The second insulating member 160 is located on the side of the top cover 110 away from the first insulating member 120, and the second insulating member 160 covers the limiting member 140. The second insulating member 160 has a filling portion 161, which abuts against the first limiting portion 141 and the pole post 130, and abuts against the first heat insulation structure 151.

[0056] In this embodiment, since the second insulating member 160 is located on the side of the top cover 110 away from the first insulating member 120, the second insulating member 160 can insulate the pole post 130, the top cover 110, and the outside world, thus preventing short circuits or electric shocks. Furthermore, since the second insulating member 160 covers the limiting member 140, and the filling portion 161 of the second insulating member 160 abuts against the first limiting portion 141 and the pole post 130, and also abuts against the first heat insulation structure 151, the second insulating member 160 can further limit the pole post 130, allowing the pole post 130 to be fixedly connected to the top cover assembly 100, thereby improving the electrical connection stability between the pole post 130 and the electrode assembly 200. At the same time, the filling portion 161 and the limiting member 140 can limit the heat insulation member 150, thereby improving the structural stability of the heat insulation member 150.

[0057] Reference Figure 3 as well as Figure 12 As shown, in Embodiment 1, the pole post 130 includes a first pole portion 131 and a second pole portion 132 connected in the height direction x. The second pole portion 132 is close to the first insulating member 120. The second heat insulation structure 152 abuts against the second pole portion 132 and the top cover 110 in the height direction x. The first pole portion 131 is close to the second insulating member 160. The filling portion 161 abuts against the first pole portion 131 in the height direction x.

[0058] In this embodiment, since the second post portion 132 is close to the first insulating member 120, and the second heat insulation structure 152 abuts against the second post portion 132 and the top cover 110 along the height direction x, thermal isolation can be achieved between the second post portion 132 and the top cover 110 through the second heat insulation structure 152. Furthermore, since the first post portion 131 is close to the second insulating member 160, and the filling portion 161 abuts against the first post portion 131 along the height direction x, the pole post 130 can be limited by the abutment between the second insulating member 160 and the first post portion 131, thereby improving the stability of the connection relationship between the pole post 130 and the top cover assembly 100.

[0059] Example 2

[0060] Reference Figure 4 as well as Figure 5 As shown, the difference between Embodiment 2 and Embodiment 1 is that the top cover assembly 100 further includes a sealing element 170, which surrounds the pole post 130. The sealing element 170 is spaced apart from the first heat insulation structure 151 along the length direction y, and the sealing element 170 abuts against the pole post 130 and the top cover 110 along the height direction x.

[0061] It should be noted that the length direction y is Figure 5 The direction indicated by y in the middle.

[0062] In this embodiment, since the sealing member 170 surrounds the terminal post 130 and abuts against the terminal post 130 and the top cover 110 along the height direction x, the sealing member 170 can seal the end of the terminal post 130 near the first insulator 120 and the top cover 110, thereby improving the internal sealing of the battery cell. Furthermore, because the sealing member 170 has the advantages of high temperature resistance and insulation, it can also provide thermal insulation between the end of the terminal post 130 near the first insulator 120 and the top cover 110. Furthermore, since the sealing element 170 is spaced apart from the first heat insulation structure 151 along the length direction y, when isolating the top cover assembly 100 and the pole post 130, the heat insulation element 150 and the sealing element 170 can be respectively surrounded around the pole post 130. The conventional sealing element 170 can be used to thermally isolate the end of the pole post 130 near the first insulating element 120 and the top cover 110 and the first insulating element 120, without the need to extend the heat insulation element 150 along the length direction y, thereby reducing the manufacturing cost of the heat insulation element 150.

[0063] Reference Figure 5As shown, in Embodiment 2, the first heat insulation structure 151 includes a first heat insulation part 1511 and a second heat insulation part 1512. The first heat insulation part 1511 extends along the height direction x, and its two ends along the height direction x abut against the first limiting part 141 and the top cover 110, respectively. The two ends of the first heat insulation part 1511 along the length direction y abut against the second limiting part 142 and the pole post 130. The second heat insulation part 1512 is connected to the first heat insulation part 151. The first heat insulation part 1511 is provided on one end of the top cover 110 along the height direction x and extends along the length direction y. The second heat insulation part 1512 abuts against the pole post 130 and the top cover 110 along the height direction x and is spaced apart from the sealing member 170 along the length direction y. In this way, the first heat insulation part 1511 and the second heat insulation part 1512 can limit the part of the pole post 130 that is clamped in the limiting groove 143, thereby improving the stability of the connection structure between the top cover assembly 100 and the pole post 130.

[0064] Reference Figure 3 As shown, the difference between Embodiment 2 and Embodiment 1 is that the second heat insulation part 1512 and the sealing member 170 abut against the second column part 132 and the top cover 110 along the height direction x.

[0065] In this embodiment, since the second heat insulation part 1512 and the sealing member 170 abut against the second column part 132 and the top cover 110 along the height direction x, thermal isolation between the second column part 132 and the top cover 110 can be achieved through the second heat insulation part 1512 and the sealing member 170.

[0066] Example 3

[0067] Reference Figures 6 to 9 As shown, the difference between Embodiment 3 and Embodiment 2 and Embodiment 1 is that the heat insulation component 150 further includes a third heat insulation structure 153. The third heat insulation structure 153 is connected to the first heat insulation structure 151 along the length direction y, and is located between the first limiting part 141 and the pole post 130 along the height direction x. The third heat insulation structure 153 is a rubber heat insulation structure.

[0068] It should be noted that the length direction y is Figure 7 as well as Figure 9 The direction indicated by y in the middle.

[0069] In this embodiment, since the third heat insulation structure 153 is connected to the first heat insulation structure 151 along the length direction y and is located between the first limiting part 141 and the pole post 130 along the height direction x, the heat insulation effect between the pole post 130 and the first limiting part 141 can be enhanced by the third heat insulation structure 153. Meanwhile, referring to... Figure 7As shown, based on Embodiment 1, in this embodiment, the portion of the pole post 130 clamped in the limiting groove 143 can be limited by the cooperation of the first heat insulation structure 151, the second heat insulation structure 152, and the third heat insulation structure 153, thereby improving the stability of the connection structure between the top cover assembly 100 and the pole post 130. (Refer to...) Figure 9 As shown, based on Embodiment 2, in this embodiment, the portion of the pole post 130 clamped in the limiting groove 143 can be limited by the cooperation of the first heat insulation structure 151 and the third heat insulation structure 153, so as to improve the stability of the connection structure between the top cover assembly 100 and the pole post 130.

[0070] Reference Figure 7 as well as Figure 9 As shown, the difference between Embodiment 3 and Embodiment 2 and Embodiment 1 is that the filling part 161 abuts against the first limiting part 141 and the pole post 130, and abuts against the third heat insulation structure 153.

[0071] In this embodiment, since the filling part 161 abuts against the first limiting part 141 and the pole post 130, and also abuts against the third heat insulation structure 153, the third heat insulation structure 153 can be limited by the filling part 161 and the limiting member 140, thereby limiting the heat insulation member 150 and improving the structural stability of the heat insulation member 150.

[0072] Example 4

[0073] Reference Figure 10 as well as Figure 11 As shown, the difference between Embodiment 4 and Embodiment 3 is that the heat insulation member 150 includes a liquid crystal polymer layer 154 and a polyphenylene sulfide layer 155 connected along the height direction x, and the liquid crystal polymer layer 154 is disposed close to the first insulating member 120, and the polyphenylene sulfide layer 155 is disposed close to the second insulating member 160.

[0074] It should be noted that polyphenylene sulfide is cheaper than liquid crystal polymers, but liquid crystal polymers have a higher melting point than polyphenylene sulfide.

[0075] In this embodiment, since the liquid crystal polymer layer 154 is disposed close to the first insulating member 120 and the polyphenylene sulfide layer 155 is disposed close to the second insulating member 160, the manufacturing cost of the heat insulation member 150 can be reduced by the polyphenylene sulfide layer 155, while the heat insulation capacity of the heat insulation member 150 can be improved by the liquid crystal polymer layer 154, so as to simultaneously meet the requirements of strong heat insulation capacity and low cost of the heat insulation member 150.

[0076] Reference Figure 12As shown, based on Embodiments 1 to 3, the pole post 130 has a protrusion 133, which is partially located in the limiting groove 143, and the first heat insulation structure 151 is located between the protrusion 133 and the second limiting part 142.

[0077] Specifically, the first column portion 131 has a first protrusion 1331, and the second column portion 132 has a second protrusion 1332. The first protrusion 1331 and the second protrusion 1332 together form a protrusion 133, so as to improve the structural stability of the first heat insulation structure 151 in the limiting groove 143 through the protrusion 133.

[0078] In this embodiment, since the protrusion 133 is partially located within the limiting groove 143, and the first heat insulation structure 151 is located between the protrusion 133 and the second limiting part 142, the first heat insulation structure 151 can be fixed between the pole post 130 and the second limiting part 142 through the protrusion 133, thereby improving the structural stability of the first heat insulation structure 151. At the same time, the protrusion 133 can be clamped through the limiting groove 143, thereby improving the stability of the connection relationship between the pole post 130 and the top cover assembly 100.

[0079] The battery pack involved in the embodiments of this application includes: the above-mentioned battery cells.

[0080] In the battery pack of this application, since the aforementioned battery cells have a low manufacturing cost, the battery pack of this application can have a low manufacturing cost.

[0081] 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.

[0082] 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 in that, The battery cell has a height direction (x), and the battery cell includes: Top cover assembly (100), the top cover assembly (100) includes a top cover (110), a first insulating member (120), a pole post (130), a limiting member (140), and a heat insulation member (150); The first insulating member (120) is located on one side of the top cover (110) along the height direction (x); The pole post (130) is sequentially inserted into the top cover (110) and the first insulating member (120) along the height direction (x); The limiting member (140) is located on the side of the top cover (110) away from the first insulating member (120) along the height direction (x). The limiting member (140) includes a first limiting part (141) and a second limiting part (142) surrounding the first limiting part (141). The second limiting part (142) is connected to the top cover (110) and surrounds the pole post (130). The first limiting part (141) and the top cover (110) form a limiting groove (143) in the height direction (x) and clamp the pole post (130). The heat insulation component (150) includes a first heat insulation structure (151), which is located in the limiting groove (143) and between the pole post (130) and the second limiting part (142). The first heat insulation structure (151) is a rubber heat insulation structure.

2. The battery cell according to claim 1, characterized in that, The battery cell also has a length direction (y) intersecting the height direction (x). The heat insulation component (150) further includes a second heat insulation structure (152). The second heat insulation structure (152) surrounds the electrode post (130). The second heat insulation structure (152) is connected to the first heat insulation structure (151) along the length direction (y). The second heat insulation structure (152) abuts against the electrode post (130) and the top cover (110) along the height direction (x). The second heat insulation structure (152) is a rubber heat insulation structure.

3. The battery cell according to claim 2, characterized in that, The second heat insulation structure (152) includes a connecting portion (1521) and a sleeve portion (1522), the sleeve portion (1522) surrounds the pole post (130), the connecting portion (1521) is connected to the first heat insulation structure (151) and the sleeve portion (1522) along the length direction (y), and the connecting portion (1521) abuts against the pole post (130) and the top cover (110) along the height direction (x).

4. The battery cell according to claim 2, characterized in that, The first heat insulation structure (151) and the second heat insulation structure (152) are integrally formed.

5. The battery cell according to claim 2, characterized in that, The top cover assembly (100) further includes a second insulating member (160) located on the side of the top cover (110) away from the first insulating member (120) and covering the limiting member (140). The second insulating member (160) has a filling portion (161) abutting against the first limiting portion (141) and the pole post (130), and abutting against the first heat insulation structure (151).

6. The battery cell according to claim 5, characterized in that, The pole post (130) includes a first post portion (131) and a second post portion (132) connected in the height direction (x). The second post portion (132) is close to the first insulating member (120). The second heat insulation structure (152) abuts against the second post portion (132) and the top cover (110) along the height direction (x). The first post portion (131) is close to the second insulating member (160). The filling portion (161) abuts against the first post portion (131) along the height direction (x).

7. The battery cell according to claim 1, characterized in that, The battery cell also has a length direction (y) intersecting the height direction (x), and the top cover assembly (100) further includes a seal (170) surrounding the terminal post (130), the seal (170) being spaced apart from the first heat insulation structure (151) along the length direction (y), and the seal (170) abutting against the terminal post (130) and the top cover (110) along the height direction (x).

8. The battery cell according to claim 1, characterized in that, The battery cell also has a length direction (y) intersecting the height direction (x). The heat insulation component (150) further includes a third heat insulation structure (153). The third heat insulation structure (153) is connected to the first heat insulation structure (151) along the length direction (y) and is located between the first limiting part (141) and the pole post (130) along the height direction (x). The third heat insulation structure (153) is a rubber heat insulation structure.

9. The battery cell according to claim 1, characterized in that, The pole post (130) has a protrusion (133) which is partially located in the limiting groove (143), and the first heat insulation structure (151) is located between the protrusion (133) and the second limiting part (142).

10. A battery pack, characterized in that, include: The battery cell as described in any one of claims 1-9.

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