Battery cell and battery pack

Abstract

The embodiment of the utility model provides a kind of battery monomer and battery pack, relate to point battery technical field.The utility model provides a kind of battery monomer and battery pack, by being provided with the insulating film with protruding membrane, to make in insulating film covering roll core, protruding membrane is located between pole lug and pole, protruding membrane can be directly covered in one side of pole lug, insulates one side of pole lug, cancel the step of sticking insulating glue in the back of pole lug in prior art, easy to operate, simplify the production procedure of battery monomer, reduce manufacturing cost, improve security;Meanwhile, protruding membrane can be directly covered in one side of pole lug and insulate it, the covering of roll core is more fitted, and the covering effect is better.

Description

Technical Field

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

[0002] In related technologies, the process of coating bare cells with Mylar film and hot-melting in lithium-ion batteries involves the following steps: the Mylar film needs to be bent, pressed and bonded according to the outline of the bare cell, hot-melted, and finally fixed with adhesive.

[0003] After the bare cells are assembled, insulating adhesive needs to be applied to the back of the tabs, then the lower plastic plate needs to be fixed, and finally the Mylar film needs to be heat-fused to the lower plastic plate to prevent short circuits caused by burrs on the electrode sheets and tabs puncturing the separator or by improper use. However, this process is cumbersome and has high manufacturing costs. Utility Model Content

[0004] The purpose of this utility model is to provide a battery cell and a battery pack that can simplify the production process of the battery cell.

[0005] The embodiments of this utility model can be implemented as follows: In a first aspect, this utility model provides a battery cell, the battery cell having a third orientation; the battery cell includes: A core, the core comprising a core body and a tab, the tab being connected to one side of the core body along the third direction; A pole post is disposed on one side of the core body along the third direction and connected to the electrode tab; An insulating film is provided to cover the winding core. The insulating film includes a first film body and a protruding film body. The first film body covers the top surface of the winding core and has a tab hole positioned opposite to the tab. The tab passes through the tab hole. The protruding film body is located inside the tab hole and connected to the first film body. The protruding film body is located between the tab and the pole and covers the side of the tab facing the pole.

[0006] In an optional embodiment, the battery cell further includes a support, which is disposed opposite to the tab and passes through the tab's positioning hole. The tab is connected to the support, and the insulating film covers the core and the support. The pole post is disposed along the third direction on the side of the bracket away from the winding core, and the pole post is connected to the pole tab and the bracket.

[0007] In an optional embodiment, the battery cell further includes a lower plastic layer disposed on one side of the winding core along the third direction; The bracket is connected to the lower plastic clip.

[0008] In an optional embodiment, the battery cell has a first direction and a third direction that are perpendicular to each other; The bracket includes a bracket body and a plurality of connecting parts. The connecting parts are respectively connected to opposite sides of the bracket body along the first direction. The bracket body and the connecting parts are both connected to one side of the winding core. The electrode tab is connected to the bracket body. The insulating film covers two of the connecting parts of the bracket.

[0009] In an optional embodiment, the support body includes a first frame, a second frame, and a body connected together. The first frame and the second frame are disposed on opposite sides of the body along the first direction. Two connecting portions are respectively disposed on the side of the first frame and the second frame away from the body along the first direction. The side of the first frame and the second frame away from the pole post is connected to the side of the winding core. The side of the first frame and the second frame close to the pole post is connected to the pole post. The main body forms a first groove and a second groove with the first frame and the second frame. The first groove is located on the side of the main body closer to the pole post along the third direction, and the second groove is located on the side of the main body away from the pole post along the third direction. The pole tabs are located opposite each other in the first groove. The folded pole tabs are connected to the main body and located in the first groove.

[0010] In an optional embodiment, the connecting part is provided with a first snap-fit ​​structure, and the lower plastic is provided with a second snap-fit ​​structure, wherein the first snap-fit ​​structure and the second snap-fit ​​structure cooperate to snap together.

[0011] In an optional embodiment, the battery cell further includes a top cover, which is disposed on one side of the winding core along the third direction, the terminal post is connected to the top cover, and the top cover is provided with a liquid injection hole and an explosion-proof valve; The first membrane body is provided with an injection position hole relative to the injection hole, and the first membrane body is provided with an explosion-proof valve position vent hole relative to the explosion-proof valve.

[0012] In an optional embodiment, the battery cell has a first direction, a second direction, and a third direction that are perpendicular to each other; The insulating film further includes a second film, a third film, and a fourth film, wherein the first film, the two second films, the two third films, and the fourth film are integrally connected; Two second membranes are respectively disposed on opposite sides of the first membrane along the second direction, and the second membranes are used to cover the large surface of the core. The third film is used to cover the bottom surface of the core, and the two third films are respectively disposed on the two second films, and the third films are disposed along the second direction on the side away from the first film; The fourth membrane is used to cover the side of the core, and the two fourth membranes are respectively disposed on opposite sides of the second membrane along the first direction.

[0013] In an optional embodiment, one of the third membranes is provided with a first vent hole, and the other third membrane is provided with a second vent hole. The two third membranes overlap and cover each other. The first vent hole and the second vent hole are spaced apart along the first direction and the second direction and do not overlap.

[0014] Secondly, the present invention provides a battery pack comprising the battery cells described in any of the foregoing embodiments.

[0015] The beneficial effects of the battery cell and battery pack provided in this embodiment of the present invention include: By setting an insulating film with a protruding body, after the insulating film wraps the core, the protruding body is located between the tab and the terminal post. The protruding body can directly wrap around one side of the tab, insulating that side of the tab. This eliminates the step of applying insulating adhesive to the back of the tab in the prior art, simplifying the operation, streamlining the production process of the battery cell, reducing manufacturing costs, and improving safety. At the same time, the protruding body can directly wrap around and insulate one side of the tab, resulting in a more snug wrapping of the core and a better wrapping effect. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the battery cell structure provided in this embodiment; Figure 2 This is an exploded view of the battery cell provided in this embodiment; Figure 3 This is a schematic diagram of the insulating film provided in this embodiment; Figure 4 A partial schematic diagram showing a protruding membrane provided in this embodiment; Figure 5 A partial schematic diagram of the first membrane body provided in this embodiment, showing two protruding membrane bodies; Figure 6 A second partial schematic diagram showing the first membrane body provided in this embodiment with two protruding membrane bodies; Figure 7 A third partial schematic diagram showing the first membrane body provided in this embodiment having two protruding membrane bodies; Figure 8 This is a top view of the battery cell provided in this embodiment; Figure 9 This is a top view of the core and support provided in this embodiment; Figure 10 This is a schematic diagram of the structure of the bracket provided in this embodiment; Figure 11 This is a schematic diagram of the connection between the bracket and the electrode provided in this embodiment.

[0018] Icons: 010 - Battery cell; X - First direction; Y - Second direction; Z - Third direction; 100 - Insulating film; 110 - First membrane body; 111 - Electrode position hole; 112 - Protruding membrane body; 113 - Liquid injection position hole; 114 - Explosion-proof valve position vent hole; 120 - Second membrane body; 130 - Third membrane body; 131 - First vent hole; 132 - Second vent hole; 140 - Fourth membrane body; 200 - Core; 210 - Electrode; 211 - Positive electrode; 212 - Negative electrode; 300 - Support; 310 - Support body; 311 - First frame; 312 - Second frame; 313 - Body; 314 - First groove; 315 - Second groove; 320 - Connecting part; 321 - First snap-fit ​​structure; 400 - Electrode post; 410 - Positive electrode post; 420 - Negative electrode post; 421 - Negative electrode connecting plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model 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 utility model.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0025] The following describes in detail the overall structure, working principle, and technical effects of the battery cell 010 and battery pack provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0026] Please refer to Figure 1 The battery cell 010 provided by this utility model is used in a battery pack.

[0027] Firstly, this utility model proposes a battery pack, which includes individual battery cells.

[0028] The battery pack can be composed of one or more individual battery cells 010.

[0029] In the first aspect, this utility model proposes a battery cell 010 having a first direction X, a second direction Y and a third direction Z that are perpendicular to each other.

[0030] Please refer to Figures 1-2 The present invention proposes a battery cell comprising: The core 200 includes a core body and a tab 210, the tab 210 being connected to one side of the core body along the third direction Z; The pole post 400 is located on one side of the core body along the third direction Z and is connected to the tab 210; The insulating film 100 includes a first film body 110 and a protruding film body 112. The first film body 110 covers the top surface of the core 200. The first film body 110 is provided with a tab hole 111 opposite to the tab 210. The tab 210 passes through the tab hole 111. The protruding film body 112 is located in the tab hole 111 and connected to the first film body 110. The protruding film body 112 is located between the tab 210 and the pole post 400 and covers the side of the tab 210 facing the pole post 400.

[0031] It is understandable that during the assembly of a single battery cell, after welding and fixing the terminal post 400 to the tab 210 of the core 200, the core 200 is covered with an insulating film 100, and the protruding film 112 is inserted between the tab 210 and the terminal post 400 so that the protruding film 112 covers the side of the tab 210 facing the terminal post 400, ensuring that the tab 210 is insulated.

[0032] By setting an insulating film 100 with a protruding membrane 112, after the insulating film 100 covers the core 200, the protruding membrane 112 is located between the tab 210 and the terminal post 400. The protruding membrane 112 can be directly covered on one side of the tab 210, eliminating the step of applying insulating adhesive to the back of the tab 210 in the prior art. This simplifies the operation, streamlines the production process of the battery cell 010, reduces manufacturing costs, and improves safety. At the same time, the protruding membrane 112 can be directly covered on one side of the tab 210, resulting in a more fitting and better covering effect for the core 200.

[0033] In this embodiment, the single cell includes a winding core 200.

[0034] In this embodiment, please refer to Figures 1-2 The core 200 includes a core body and a tab 210, with the tab 210 connected to one side of the core body along the third direction Z.

[0035] Please refer to Figure 2 and Figure 9 The tab 210 includes a positive tab 211 and a negative tab 212, which are spaced apart and connected to the core body.

[0036] In this embodiment, the battery cell 010 includes a terminal post 400.

[0037] In this embodiment, the pole post 400 is disposed on one side of the core body along the third direction Z and is connected to the tab 210.

[0038] Please refer to Figure 2 and Figure 8The terminal 400 includes a positive terminal 410 and a negative terminal 420. The positive terminal 410 is connected to the positive tab 211 on the Z-direction side, and the negative terminal 420 is connected to the negative tab 212 on the Z-direction side via the negative connection plate 421.

[0039] In this embodiment, the battery cell 010 also includes a lower plastic layer.

[0040] In this embodiment, the lower plastic is disposed on one side of the core 200 along the third direction Z, and the lower plastic is supported between the top cover and the core 200 covered with the insulating film 100. The lower plastic has a plurality of spaced-apart first mating grooves. The positive electrode post 410 passes through the first mating groove and connects to the positive electrode tab 211. The explosion-proof valve passes through the first mating groove and communicates with the explosion-proof valve vent hole 114. The negative electrode post 420 passes through the first mating groove and connects to the negative electrode tab 212.

[0041] In this embodiment, the battery cell 010 also includes a top cover.

[0042] In this embodiment, the top cover is disposed on one side of the winding core 200 along the third direction Z, and the pole post 400 is connected to the top cover. The top cover is provided with a liquid injection hole and an explosion-proof valve. The top cover is provided with multiple second mating grooves for sealing and connecting the positive pole post 410, the explosion-proof valve and the negative pole post 420 respectively.

[0043] In this embodiment, the battery cell 010 also includes a casing.

[0044] In this embodiment, the housing has an opening, the core 200 covered with insulating film 100 is housed inside the housing, and a cover plate is sealed at one end of the opening of the housing.

[0045] In this embodiment, the battery cell 010 includes an insulating film 100.

[0046] Among them, the insulating film 100 is used to cover the core 200.

[0047] In this embodiment, please refer to Figure 2 and Figure 3The insulating film 100 includes a first film 110, a second film 120, a third film 130, and a fourth film 140. The first film 110, the two second films 120, the two third films 130, and the fourth film 140 are integrally connected and distinguished by pre-fold lines. The first film 110 covers the top surface of the core 200. The two second films 120 are respectively disposed on opposite sides of the first film 110 along the second direction Y, and the second films 120 are used to cover the large surface of the core 200. The third film 130 is used to cover the bottom surface of the core 200, and the two third films 130 are respectively disposed on the two second films 120, and the third films 130 are disposed on the side away from the first film 110 along the second direction Y. The fourth film 140 is used to cover the side surface of the core 200, and the two fourth films 140 are respectively disposed on opposite sides of the second film 120 along the first direction X.

[0048] Alternatively, please refer to Figure 3 One of the third membrane bodies 130 is provided with a first exhaust hole 131, and the other third membrane body 130 is provided with a second exhaust hole 132. The two third membrane bodies 130 overlap each other, and the first exhaust hole 131 and the second exhaust hole 132 are spaced apart along the first direction X and the second direction Y and do not overlap.

[0049] The overlapping of the two third membrane bodies 130 can be understood as the two third membrane bodies 130 overlapping one after another to cover the bottom surface of the core 200.

[0050] It is understandable that the first vent 131 and the second vent 132 are spaced apart along the first direction X and the second direction Y and do not overlap, so as to avoid the formation of a channel between the core 200 and the shell, so that particles cannot pass through the channel and avoid short circuit of the single cell.

[0051] In this embodiment, please refer to Figure 2 and Figure 3 The first membrane 110 is provided with a tab hole 111 opposite to the tab 210, and the tab 210 passes through the tab hole 111; the protruding membrane 112 is located in the tab hole 111 and connected to the first membrane 110, and the protruding membrane 112 is located between the tab 210 and the pole post 400 and covers the side of the tab 210 facing the pole post 400.

[0052] Optionally, if the tab 210 includes a positive tab 211 and a negative tab 212, then the first membrane 110 is provided with two tab position holes 111 that are spaced apart and opposite to the positive tab 211 and the negative tab 212, and the positive tab 211 and the negative tab 212 are respectively inserted through the two tab position holes 111.

[0053] In this embodiment, please refer to Figures 5-7The core 200 includes two cores, which are arranged side by side along the second direction Y. The first membrane 110 covers the two cores 200 and is connected to two protruding membranes 112. In the first direction X, the two protruding membranes 112 are located on opposite sides of the tab hole 111.

[0054] Alternatively, please refer to Figure 4 The core 200 includes one, and the first membrane 110 is connected to a protruding membrane 112 along one side of the tab hole 111.

[0055] In an optional embodiment, please refer to Figures 4-7 The protruding membrane 112 can be any shape, such as trapezoidal, semi-elliptical, or rectangular.

[0056] In this embodiment, the width of the protruding membrane 112 in the second direction Y is L1mm, and the width of the tab 210 in the second direction Y is L2mm. Then, the single cell satisfies: L1≥L2+2mm.

[0057] In this embodiment, the width of the tab hole 111 in the second direction Y is L3mm, and the width of the electrode post 400 in the second direction Y is L4mm. Therefore, the single cell satisfies: L3 = L4 - 2mm.

[0058] Optionally, the first membrane body 110 is provided with an injection position hole 113 relative to the injection hole of the top cover, and the first membrane body 110 is provided with an explosion-proof valve position vent hole 114 relative to the explosion-proof valve of the top cover.

[0059] In this embodiment, please refer to Figure 2 and Figure 9 The battery cell 010 also includes a bracket 300, which is positioned opposite the tab 210. The bracket 300 passes through the tab hole 111 and is connected to the tab 210. An insulating film 100 covers the core 200 and the bracket 300. A terminal post 400 is positioned along the third direction Z on the side of the bracket 300 away from the core 200 and is connected to the tab 210 and the bracket 300. It is understandable that by setting up the bracket 300, covering the insulating film 100 together with the core 200, and then connecting the bracket 300 to the lower plastic, the step of heat-melting and fixing the lower plastic and Mylar in the prior art is eliminated, the production steps are optimized, the operation is simple, and the cost is low. At the same time, the tab 210 is connected to the pole post 400 on one side in the third direction Z through the protruding film 112, and the protruding film 112 insulates one side of the tab 210. The tab 210 is connected to the bracket 300 on the other side in the third direction Z, so the bracket 300 insulates the other side of the tab 210. Compared with the prior art solution of heat-melting and fixing the Mylar with the lower plastic, the present application has a better covering effect and a better insulation effect on the core 200.

[0060] Optionally, two brackets 300 are provided, with the two brackets 300 respectively positioned opposite the positive electrode tab 211 and the negative electrode tab 212, and respectively connected to the positive electrode post and the negative electrode post.

[0061] In this embodiment, please refer to Figures 10-11 The bracket 300 includes a bracket body 310 and a plurality of connecting parts 320 connected together. The bracket body 310 is connected to the connecting parts 320 on opposite sides along the first direction X. The bracket body 310 and the connecting parts 320 are both connected to one side of the core 200. The tab 210 is connected to the bracket body 310. The insulating film 100 covers the core 200 and the plurality of connecting parts 320 of the bracket 300.

[0062] The bracket body 310 and the connecting part 320 can be connected and fixed to one side of the core 200 by means of adhesive bonding or other methods.

[0063] Optionally, there may be two connecting portions 320, with the bracket body 310 connected to two connecting portions 320 on opposite sides along the first direction X or the second direction Y. Of course, there may be three or four connecting portions 320, in which case the connecting portions 320 may be arranged on the bracket body 310 along the first direction X and the second direction Y.

[0064] Alternatively, please refer to Figures 10-11 The support body 310 includes a first frame 311, a second frame 312 and a body 313 connected to each other. The first frame 311 and the second frame 312 are disposed on opposite sides of the body 313 along a first direction X. Two connecting parts 320 are respectively provided on the side of the first frame 311 and the second frame 312 away from the body 313 along the first direction X. The side of the first frame 311 and the second frame 312 away from the pole post 400 is connected to the side of the core 200. The side of the first frame 311 and the second frame 312 close to the pole post 400 is connected to the pole post 400.

[0065] Please refer to Figure 11The main body 313 forms a first groove 314 and a second groove 315 with the first frame 311 and the second frame 312. The first groove 314 is located on the side of the main body 313 near the pole post 400 along the third direction Z. The second groove 315 is located on the side of the main body 313 away from the pole post 400 along the third direction Z. The pole tab 210 is located in the first groove 314. The folded pole tab 210 is connected to the main body 313 and located in the first groove 314.

[0066] It is understandable that the bracket body 310 with the first groove 314 and the second groove 315 can shape the tab 210 to prevent redundant insertion of the tab 210.

[0067] In this embodiment, the bracket 300 is connected to the lower plastic clip.

[0068] Alternatively, please refer to Figures 10-11 The connecting part 320 is provided with a first snap-fit ​​structure 321, and the lower plastic is provided with a second snap-fit ​​structure. The second snap-fit ​​structure and the first snap-fit ​​structure 321 are engaged and snap-fitted together.

[0069] Optionally, the first snap-fit ​​structure 321 can be two snap-fit ​​structures spaced apart along the first direction X, and the second snap-fit ​​structure can be two slots spaced apart along the first direction X.

[0070] The manufacturing process and technology of the battery cell 010 and battery pack provided in this embodiment of the utility model are as follows: First, please refer to Figure 9 The bracket 300 is connected to the tab 210 and the core 200 so that the tab 210 is positioned in the first groove 314. The tab 210 is folded so that the folded tab 210 is connected to the body 313 and positioned in the first groove 314, ensuring that one side of the tab 210 is insulated. Secondly, please refer to Figure 8 After welding and fixing the pole post 400 to the bracket 300, the core 200 is covered with an insulating film 100, and the protruding film 112 is inserted between the tab 210 and the pole post 400 so that the protruding film 112 covers the side of the tab 210 facing the pole post 400, ensuring that the opposite sides of the tab 210 in the third direction Z are insulated.

[0071] Finally, please refer to Figure 1 The lower plastic fitting is snapped into the bracket 300 for fixation. The core 200 and the lower plastic fitting are then inserted into the housing, and the top cover is welded at the opening of the housing. Thus, the battery cell 010 is assembled.

[0072] In summary, the battery cell 010 and battery pack provided in this embodiment of the present invention, by providing an insulating film 100 with a protruding film 112, ensure that after the insulating film 100 covers the core 200, the protruding film 112 is located between the tab 210 and the terminal post 400. The protruding film 112 can directly cover one side of the tab 210, insulating one side of the tab 210. This eliminates the step of applying insulating adhesive to the back of the tab 210 in the prior art, simplifying the operation, streamlining the production process of the battery cell 010, reducing manufacturing costs, and improving safety. At the same time, the protruding film 112 can directly cover and insulate one side of the tab 210, resulting in a more fitting and better covering effect for the core 200.

[0073] Furthermore, by setting up a bracket 300, the bracket 300 and the core 200 are together covered with the insulating film 100, and then the bracket 300 is connected to the lower plastic. This eliminates the step of heat-melting and fixing the lower plastic and Mylar in the prior art, optimizes the production steps, simplifies the operation, and reduces costs. At the same time, the tab 210 is connected to the pole post 400 on one side in the third direction Z through a protruding film 112, which insulates one side of the tab 210. The tab 210 is connected to the bracket 300 on the other side in the third direction Z, so the bracket 300 insulates the other side of the tab 210. Compared with the prior art solution of heat-melting and fixing the Mylar with the lower plastic, this application has a better covering effect and a better insulation effect on the core 200.

[0074] The bracket body 310 is provided with a first groove 314 and a second groove 315, which can also shape the electrode 210 to prevent redundant insertion of the electrode 210.

[0075] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A battery cell (010), characterized in that, The battery cell (010) has a third orientation (Z); the battery cell (010) includes: The core (200) includes a core body and a tab (210), the tab (210) being connected to one side of the core body along the third direction (Z); A pole post (400) is disposed on one side of the core body along the third direction (Z) and connected to the tab (210); An insulating film (100) includes a first film body (110) and a protruding film body (112). The first film body (110) covers the top surface of the core (200). The first film body (110) is provided with a tab hole (111) opposite to the tab (210). The tab (210) passes through the tab hole (111). The protruding film body (112) is located in the tab hole (111) and connected to the first film body (110). The protruding film body (112) is located between the tab (210) and the pole post (400) and covers the side of the tab (210) facing the pole post (400).

2. The battery cell (010) according to claim 1, characterized in that, The battery cell (010) also includes a bracket (300), which is disposed opposite to the tab (210). The bracket (300) passes through the tab hole (111), and the tab (210) is connected to the bracket (300). The insulating film (100) covers the core (200) and the bracket (300). The pole post (400) is disposed along the third direction (Z) on the side of the bracket (300) away from the core (200), and the pole post (400) is connected to the tab (210) and the bracket (300).

3. The battery cell (010) according to claim 2, characterized in that, The battery cell (010) also includes a lower plastic, which is disposed on one side of the core (200) along the third direction (Z); The bracket (300) is connected to the lower plastic clip.

4. The battery cell (010) according to claim 3, characterized in that, The battery cell (010) also has a first direction (X), which is perpendicular to the third direction (Z); The bracket (300) includes a bracket body (310) and a plurality of connecting parts (320) connected together. The bracket body (310) is connected to the connecting parts (320) on opposite sides along the first direction (X). The bracket body (310) and the connecting parts (320) are both connected to one side of the core (200). The tab (210) is connected to the bracket body (310). The insulating film (100) covers the plurality of connecting parts (320) of the bracket (300).

5. The battery cell (010) according to claim 4, characterized in that, The support body (310) includes a first frame (311), a second frame (312), and a body (313) connected together. The first frame (311) and the second frame (312) are disposed on opposite sides of the body (313) along the first direction (X). The first frame (311) and the second frame (312) are respectively provided with two connecting parts (320) on the side away from the body (313) along the first direction (X). The side of the first frame (311) and the second frame (312) away from the pole post (400) is connected to the side of the core (200). The side of the first frame (311) and the second frame (312) close to the pole post (400) is connected to the pole post (400). The main body (313) forms a first groove (314) and a second groove (315) with the first frame (311) and the second frame (312). The first groove (314) is located on the side of the main body (313) close to the pole post (400) along the third direction (Z). The second groove (315) is located on the side of the main body (313) away from the pole post (400) along the third direction (Z). The pole tab (210) is located in the first groove (314). The folded pole tab (210) is connected to the main body (313) and located in the first groove (314).

6. The battery cell (010) according to claim 4, characterized in that, The connecting part (320) is provided with a first snap-fit ​​structure (321), and the lower plastic is provided with a second snap-fit ​​structure. The first snap-fit ​​structure (321) and the second snap-fit ​​structure are engaged and snap-fitted together.

7. The battery cell (010) according to claim 1, characterized in that, The battery cell (010) also includes a top cover, which is disposed on one side of the winding core (200) along the third direction (Z). The pole post (400) is connected to the top cover, and the top cover is provided with a liquid injection hole and an explosion-proof valve. The first membrane (110) is provided with a liquid injection position hole (113) relative to the liquid injection hole, and the first membrane (110) is provided with an explosion-proof valve position vent hole (114) relative to the explosion-proof valve.

8. The battery cell (010) according to claim 1, characterized in that, The battery cell (010) also has a first direction (X) and a second direction (Y), wherein the first direction (X), the second direction (Y) and the third direction (Z) are perpendicular to each other; The insulating film (100) further includes a second film (120), a third film (130) and a fourth film (140), wherein the first film (110), the two second films (120), the two third films (130) and the fourth film (140) are integrally connected; Two second membrane bodies (120) are respectively disposed on opposite sides of the first membrane body (110) along the second direction (Y), and the second membrane bodies (120) are used to cover the large surface of the core (200); The third film (130) is used to cover the bottom surface of the core (200), and the two third films (130) are respectively disposed on the two second films (120), and the third film (130) is disposed along the second direction (Y) on the side away from the first film (110); The fourth membrane (140) is used to cover the side of the core (200), and the two fourth membranes (140) are respectively disposed on opposite sides of the second membrane (120) along the first direction (X).

9. The battery cell (010) according to claim 8, characterized in that, One of the third membrane bodies (130) is provided with a first vent hole (131), and the other third membrane body (130) is provided with a second vent hole (132). The two third membrane bodies (130) overlap each other, and the first vent hole (131) and the second vent hole (132) are spaced apart along the first direction (X) and the second direction (Y) and do not overlap.

10. A battery pack, characterized in that, Includes the battery cell (010) as described in any one of claims 1-9.

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