Battery cell, battery module and electric device

Abstract

A battery cell, a battery module and an electric device. The battery cell comprises: a core, an end face thereof being provided with a tab; a casing assembly for mounting the core; a spacer ring, which comprises a spacer ring body and a limiting member, wherein the spacer ring body is used for fixing the tab, and the limiting member is configured to restrict wobbling of the spacer ring, thus reducing the flipping of the spacer ring in the direction of thickness of the tab after being fitted together; and an insulating member, which is arranged between the core and the casing assembly to separate same by insulation, wherein the insulating member protrudes from the core in the direction of length of the core, and the insulating member is connected and fixed at an overlap area with the spacer ring, thus further restricting the position of the spacer ring. The insulating member comprises a thermosensitive layer, enabling same to be assembled rapidly by means of rolling using a hot-press roller. The insulating member is a multi-layer composite film; thus, while the puncture resistance of the insulating member is improved, the risk of degradation of the insulating member can also be reduced.

Description

Battery cell, battery module and electrical equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 29, 2024, with application number 202410383382.4 and application name “A battery cell, a battery module and an electrical device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery cell, a battery module and an electrical device. Background Art

[0003] Batteries are widely used in our daily lives and have a significant impact on our lives. With the gradual development of battery technology, batteries with good performance are increasingly sought after.

[0004] Among them, the assembly procedure between the battery core and the shell is complicated, and the use of spacers is required to clamp the pole ears. Common spacers cannot limit the shaking of the spacers relative to the pole core after being buckled. That is, when assembling components such as the cover plate, since the spacers have no limiting devices, there is a risk of shaking, thereby affecting the performance of the clamped pole ears, or it is necessary to add a positioning process for the spacers, which increases the corresponding assembly costs. Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems existing in the related art. To this end, one purpose of the present application is to provide a battery cell that can limit the position of a spacer when assembling the battery cell.

[0006] A battery cell according to an embodiment of the present application includes: a pole core, wherein an end surface of the pole core is provided with a pole lug;

[0007] A housing assembly, the housing assembly being used to mount the pole core;

[0008] A spacer, comprising a spacer body and a limiting member, wherein the spacer body is used to fix the tab, and the limiting member is used to limit the shaking of the spacer;

[0009] An insulating member is provided between the pole core and the housing assembly, the insulating member protrudes from the pole core along a first direction, the insulating member at least partially overlaps with the spacer, and the overlapping portion of the insulating member and the spacer is connected and fixed,

[0010] The first direction is perpendicular to the end surface.

[0011] Optionally, the limiting member is arranged outside the spacer body.

[0012] The limiting member is arranged at an angle to the end surface of the pole core, and the limiting member is used to abut against the surface of the pole core to limit the shaking of the spacer ring.

[0013] Optionally, the housing assembly includes a cover plate, a first limiting portion is provided on a side of the limiting member facing the cover plate, and the cover plate is provided with a positioning portion adapted to the first limiting portion.

[0014] Optionally, the battery cell includes an insulating member, which is disposed between the pole core and the housing assembly, the insulating member protruding from the pole core along a first direction, and the insulating member is connected and fixed to an overlapping area of ​​the spacer;

[0015] The first direction is perpendicular to the end face of the pole core.

[0016] Optionally, the insulating member includes a thermosensitive layer, and the thermosensitive layer is suitable for hot-melt bonding with the pole core at the starting temperature.

[0017] Optionally, the insulating member is a multi-layer structure.

[0018] Optionally, the insulating member includes a PP layer and a PET layer, and the PP layer is arranged on a side close to the pole core.

[0019] Optionally, the insulating member includes two insulating films, the two insulating films are respectively attached to first surfaces of the pole core that are opposite to each other, and the area of ​​the first surface is larger than the area of ​​the remaining surfaces of the pole core;

[0020] The insulating film is arranged to protrude from the pole core, and the two insulating films are overlapped and connected at the side of the pole core to cover the pole core.

[0021] Optionally, the length of the insulating film protruding from the pole core is L6, the gap between the pole core and the shell assembly is L5, and the height of the side surface of the pole core is L7.

[0022] Optionally, the length of the pole core along the first direction is L1, the distance between the two oppositely arranged spacers is L2, and 0.4 mm ≤ L2 - L1 ≤ 1.5 mm.

[0023] The spacer 30 of the battery cell provided in the present application is provided with a spacer body 301 and a limiter 302. The limiter 302 is configured to limit the shaking of the spacer 30 when other structural components are installed after the spacer 30 clamps the tab 205, thereby reducing the instability of the spacer 30 caused by the installation process and affecting the performance of the tab 205. In addition, an insulating member 40 is provided between the pole core 20 and the shell assembly. The insulating member 40 protrudes from the pole core 20 in the direction opposite to the end face 201 where the tab 205 is provided, that is, the insulating member 40 protrudes along the length of the battery. The protruding insulating member 40 and the spacer 30 have an overlapping area. Connecting and fixing the insulating member 40 to the spacer 30 in the overlapping area can improve the insulation performance of the battery cell and can also reduce the possibility of the spacer 30 flipping in the thickness direction of the pole core 20 to a certain extent.

[0024] The present application also provides a battery module. According to an embodiment of the present application, the battery module includes a mounting member and a plurality of battery cells 100 , wherein the battery cells are any of the battery cells described in the above embodiments, and the plurality of battery cells are disposed in the mounting member.

[0025] The present application also proposes an electrical device.

[0026] An electrical device according to an embodiment of the present application includes the battery module described in any one of the above embodiments.

[0027] The advantages of the electrical equipment, the battery module and the above-mentioned battery cell 100 relative to the related art are the same and will not be described in detail here.

[0028] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] FIG1 is an exploded view of a battery cell provided in an embodiment of the present application;

[0031] FIG2 is a schematic structural diagram of a spacer ring provided in an embodiment of the present application;

[0032] FIG3 is a schematic structural diagram of the assembly of a spacer ring with a limiting member and a pole core according to an embodiment of the present application;

[0033] FIG4 is a schematic structural diagram of an insulating film assembly provided in an embodiment of the present application;

[0034] FIG5 is a multi-layer structure of a battery cell insulation member provided in an embodiment of the present application;

[0035] FIG6 is a schematic diagram of the hot pressing roller assembly of the insulating film provided in an embodiment of the present application;

[0036] FIG7 is a cross-sectional view of a pole core with an insulating member provided in an embodiment of the present application along the width direction of the pole core;

[0037] FIG8 is a schematic structural diagram of the interference fit between the spacer and the pole core provided in an embodiment of the present application;

[0038] Figure numerals: battery cell 100, shell body 11, cover plate 101, pole post 102, pole core 20, end face 201, side face 202, first surface 203, pole ear 205, spacer 30, spacer body 301, limiter 302, insulating member 40, insulating film 41, thermosensitive layer 401, PP layer 402, PET layer 403, adhesive layer 404, first direction X, second direction Y, third direction Z, hot pressing roller 50. DETAILED DESCRIPTION

[0039] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0040] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the applicability of other processes and / or the use of other materials.

[0041] The battery cell 100 of the embodiment of the present application includes a pole core 20, a shell assembly, a spacer 30, and an insulating member 40. The end face 201 of the pole core 20 is provided with a pole tab 205. The shell assembly is used to mount the pole core 20. The spacer 30 includes a spacer body 301 and a stopper 302. The spacer body 301 is used to fix the pole tab 205, and the stopper 302 is used to limit the swing of the spacer 30. The insulating member 40 is arranged between the pole core 20 and the shell assembly. The insulating member 40 protrudes from the pole core 20 along the first direction X. The insulating member 40 and the spacer 30 are connected and fixed in the overlapping area.

[0042] Specifically, as shown in Figures 1 and 4 , the battery cell 100 of the present embodiment includes a core 20, which comprises six surfaces: two oppositely disposed end surfaces 201, a first surface 203, and a side surface 202. The end surface 201 is provided with a first surface 203 of a tab 205. The first surface 203, generally referred to as the large surface, is larger than the other surfaces, and two insulating films 41 are attached to the large surface. On the side surface 202, the insulating films 41 protrude from the core 20 and overlap to cover the core 20.

[0043] The pole core 20 is installed in the housing assembly, which includes a housing body 11 and a cover plate 101. The pole core 20 is accommodated in the housing body 11. The cover plate 101 is provided with a pole post 102 for conducting the electrical energy of the pole core 20 to the electrical equipment. The cover plate 101 cooperates with the housing body 11 to assemble and seal the pole core 20. The end face 201 of the pole core 20 is provided with a pole ear 205. The spacer 30 includes a spacer body 301 and a limiter 302. The spacer body 301 is used to clamp and fix the pole ear 205. The limiter 302 is configured to limit the shaking of the spacer 30. The spacer 30 with the limiter 302 ensures that after the spacer 30 is fastened to the pole ear 205, the spacer 30 does not require additional workpieces and processes to position the spacer 30, which to a certain extent reduces the risk of the spacer 30 folding in the thickness direction of the pole core 20. In addition, the insulating part 40 is arranged between the pole core 20 and the shell assembly to insulate the shell assembly and the pole core 20. The insulating part 40 is protruding from the pole core 20 in the direction opposite to the end face 201 of the pole core 20. The insulating part 40 protruding from the pole core 20 has an overlapping part with the spacer 30, and the overlapping area of ​​the spacer 30 and the insulating part 40 is connected and fixed. On the one hand, the insulating part 40 is protruding from the pole core 20, which can improve the insulation performance of the pole core 20 to a certain extent and reduce the risk of insulation failure of the insulating part 40 at the corner of the end face 201 of the pole core 20. On the other hand, the insulating part 40 is connected and fixed to the overlapping area of ​​the spacer 30, which can also improve the limit of the spacer 30 and further fix the position between the spacer 30 and the pole core 20. After the battery cell 100 is assembled, the shape of the pole ear 205 can be well guaranteed.

[0044] In one embodiment, the limiting member 302 is arranged outside the spacer body 301, and the limiting member 302 is arranged at an angle to the end surface 201 of the pole core 20. The limiting member 302 is used to abut against the surface of the pole core 20 to limit the shaking of the spacer 30.

[0045] The direction along the end surface 201 of the pole core 20 is assumed to be the first direction X. That is, the first direction X is the length direction of the pole core 20 .

[0046] The second direction Y is the thickness direction of the pole core 20 , and the third direction Z is the width direction of the pole core 20 .

[0047] Specifically, as shown in Figures 2 and 3, the spacer body 301 includes a clamping portion, which is used to clamp and secure the tabs 205. The clamping portion includes two clamping members, which are arranged opposite each other, with the direction along the clamping members corresponding to the thickness of the pole core 20. One end face 201 of the clamping portion contacts the pole core 20, while the other end face 201 contacts the assembly welded to the battery cover 101, thereby positioning the pole core 20 in the first direction X. In addition, after the spacer 30 is fastened to the tabs 205, it has an interference fit with the positive and negative tabs 205, eliminating the need for additional workpieces to secure the spacer 30.

[0048] The limiting member 302 is a rib plate, which is arranged on the outside of the clamping part. The rib plate is arranged at an angle to the end face 201 of the pole core 20. Specifically, the rib plate is arranged perpendicular to the end face 201 of the pole core 20. When the spacer ring 30 is fastened, the rib plate can abut against the surface of the pole core 20, which can reduce the situation where the spacer ring 30 after fastening is flipped in the fastening direction.

[0049] In one embodiment, a first limiting portion is provided on the side of the limiting member 302 facing the cover plate 101, and correspondingly, a positioning portion adapted to the first limiting portion is provided on the cover plate 101. After the spacer 30 clamps the pole ear 205, the spacer 30 shakes along the thickness direction of the pole core 20 when the cover plate 101 is installed, causing the clamped pole ear 205 to be pulled and affecting the performance.

[0050] Specifically, the first limiting portion can be a protrusion set on the side of the spacer 30 facing the cover plate 101, and the positioning portion on the cover plate 101 is a recess that matches the protrusion. After the spacer 30 clamps the pole ear 205, the spacer 30 can be limited to shake in the thickness direction of the pole core 20 during the assembly process of the cover plate 101 through the cooperation of the protrusion and the recess. There is no need to add additional positioning steps during the assembly process, the structure is simple, and the process is convenient.

[0051] In one embodiment, the insulating member 40 is a multi-layer structure.

[0052] Specifically, because the common insulating film 41 is made of a soft material that easily collapses, when the pole core 20 with the insulating film 41 is assembled into the housing assembly, the insulating film 41 will be pressed against, which may lead to the risk of poor insulation between the pole core 20 and the housing assembly. The insulating member 40 with multiple layers can effectively alleviate the problem of micropores in the single-layer insulating film 41 to a certain extent, in order to improve the insulation performance of the insulating member 40. This application adopts a multi-layer composite form, and the number of layers can be adjusted according to specific needs.

[0053] The insulating film 41 may be made of PP (Polypropylene) / PE (Polyethylene) / PET (Polyethylene Terephthalate) or other polyolefin films to ensure that the insulating film 41 has stable insulation properties.

[0054] In one embodiment, the insulating member 40 includes a PP layer 402 and a PET layer 403 , and the PP layer 402 is disposed on a side close to the pole core 20 .

[0055] Specifically, as is well known, the electrode core 20 is composed of alternating layers of positive electrode sheets, diaphragms, and negative electrode sheets. Generally, the outermost layer of the electrode core 20 is the diaphragm, which covers the outermost negative electrode sheet. Because PET has good insulation properties, good chemical resistance, and good mechanical strength, it is widely used in the field of the insulating film 41 of the electrode core 20. When the insulating member 40 is made of pure PET material, if the outermost diaphragm of the electrode core 20 is punctured by a foreign object, the insulating film 41 made of PET material will come into contact with the outermost negative electrode sheet. In the presence of electrolyte and contact with the negative electrode sheet, the mechanical properties of PET material will be weakened, that is, there is a risk of degradation. PP material has a lower risk of degradation when in the presence of electrolyte and contact with the negative electrode sheet, so the PP layer 402 is placed on the side close to the electrode core 20. In addition, if the insulating part 40 is made of pure PP material, due to the small gap between the pole core 20 and the shell assembly, it is not conducive to the assembly of the pole core 20 to the shell assembly. PET is set on the outermost layer of the insulating part 40. During the assembly of the pole core 20, the friction coefficient between the insulating part 40 and the shell assembly is small, which is conducive to the assembly of the pole core 20. It can also improve the ability of the insulating film 41 to resist puncture by foreign objects and improve the yield rate of the battery cell 100 process.

[0056] Optionally, as shown in FIG5 , an adhesive layer 404 is provided between the PP layer 402 and the PET layer 403 for bonding the PP layer 402 and the PET layer 403 so that the two are more firmly bonded.

[0057] In one embodiment, the insulating member 40 includes two insulating films 41, which are respectively attached to the first surfaces 203 opposite to the pole core 20, the area of ​​the first surface 203 is larger than the area of ​​the other surfaces of the pole core 20, and the insulating film 41 is arranged to protrude from the pole core 20. The two insulating films 41 are overlapped and connected on the side surface 202 of the pole core 20 to cover the pole core 20.

[0058] Specifically, as shown in FIG4 , the insulating member 40 is disposed between the pole core 20 and the shell assembly. Due to the small gap between the shell assembly and the pole core 20, scratches are easily generated during the manufacturing process, and the tightness and flatness of the insulating member 40 and the pole core 20 cannot be fully guaranteed. There are wrinkles, flanging, etc., and there is a risk of failure of the insulating film 41. Its production efficiency needs to be improved. In this embodiment, two insulating films 41 are respectively attached to the first surface 203 of the pole core 20. The first surface 203 is the largest side of the pole core 20. The bonding is performed by rolling with a hot pressing roller 50 on the largest first surface 203 to maximize the flatness of the fit. The insulating member 40 protrudes from the pole core 20. The insulating member 40 protruding from the pole core 20 is overlapped and connected on the side 202 of the pole core 20, which can insulate the pole core 20 and the shell assembly.

[0059] Since the two spaced insulating films 41 need to overlap to cover the pole core 20, the sum of the lengths of the two insulating films 41 protruding from one side of the pole core 20 should be greater than or equal to the dimension in the thickness direction of the pole core 20, that is, the sum of the lengths of the two insulating films 41 protruding from one side of the pole core 20 along the width of the pole core 20 should be greater than or equal to the thickness of the pole core 20.

[0060] Optionally, the two insulating films 41 are respectively a first insulating film 41 and a second insulating film 41. When the length of the first insulating film 41 protruding along the width direction of the pole core 20 is equal to the thickness of the pole core 20, the length of the second insulating film 41 protruding along the width direction of the pole core 20 is less than the thickness of the pole core 20. Specifically, the length of the second insulating film 41 protruding along the width of the pole core 20 can be 0.

[0061] Optionally, when the lengths of the two insulating films 41 protruding along the width direction of the pole core 20 are the same, the length of the insulating film 41 protruding beyond the width of the pole core 20 is L6, and the value range of L6 is: 1 / 2 the thickness of the pole core 20 <L6。

[0062] In one embodiment, the insulating member 40 includes a thermosensitive layer 401 , and the thermosensitive layer 401 is suitable for performing thermal melting bonding with the pole core at a starting temperature.

[0063] Specifically, when assembling the existing insulating part 40 with the pole core 20 or the shell assembly, additional adhesives are usually required, which increases the corresponding production material cost and assembly cost. The insulating part 40 provided in this embodiment includes a heat-sensitive layer 401, which can reduce costs to a certain extent. Furthermore, the surface of the insulating part 40 in contact with the pole core 20 and the spacer 30 is provided with a heat-sensitive layer 401, and the heat-sensitive layer 401 includes a hot-melt resin. At room temperature, the hot-melt resin is solid and non-sticky. At a certain starting temperature, the hot-melt resin melts to achieve bonding between the insulating part 40 and the pole core 20 and the spacer 30. For example, the starting temperature of this application is 70°C to 200°C. Then, when the temperature is lower than the set starting temperature, the hot-melt resin is in a solid state to achieve bonding. The hot-melt resin of this application can be a thermoplastic polymer material of polyurethane or rubber type material, and can also include a mixture of tackifiers, viscosity modifiers and antioxidants.

[0064] Optionally, as shown in Figure 6 , the insulating member 40 with the heat-sensitive layer 401 provided herein can be assembled with the pole core 20 using a high-speed, low-pressure hot pressing roller 50, thereby improving assembly efficiency and minimizing the footprint of the corresponding assembly production line. Hot-melt bonding simplifies the assembly process and effectively enhances the insulation stability between the pole core 20 and the housing assembly.

[0065] In one embodiment, the length of the insulating film 41 protruding from the pole core 20 is L6, the gap between the pole core 20 and the housing is L5, and the height of the side surface 202 of the pole core 20 is L7. Specifically, the length of the insulating film 41 protruding from the pole core 20 along the width direction of the pole core 20 is L6, and the thickness of the pole core 20 is L7. The maximum length of L6 is as follows:

[0066] As shown in FIG7 , it is understood that in order to reduce the occurrence of flanging, wrinkling, etc. on the protruding portion of the insulating member 40, the size of the protruding portion of the insulating film 41 from the pole core 20 should be strictly controlled. The size of the protruding portion of the insulating film 41 is inevitably subject to a certain error. Since there is a certain gap between the pole core 20 and the shell assembly, because the gap is small, the length of the protruding portion of the insulating film 41 from the pole core 20 can be limited to less than 1 / 2 of the length according to the Pythagorean theorem.

[0067] In one embodiment, the length direction of the pole core 20 is L1, the distance between the two oppositely disposed spacers 30 is L2, and 0.4 mm ≤ L2 - L1 ≤ 1.5 mm.

[0068] Specifically, as shown in Figure 8, L2 is the distance between the surfaces of the spacer 30 facing the pole core 20, and L1 is the length direction of the pole core 20. In order to ensure that there is a certain amount of interference between the spacer 30 and the pole core 20, thereby realizing the positioning of the pole core 20 in the length direction of the shell assembly, and taking into account the difficulty of assembly, it is necessary to limit the distance between the spacer 30 and the end face 201 of the pole core 20 to 0.4mm≤L2-L1≤1.5mm. It is understandable that when L1 is less than L2, after the spacer 30 is assembled, the bottom end face 201 of the spacer 30 will press down the diaphragm at both ends of the pole core 20, which is equivalent to the pole core 20 length and the spacer 30 being an interference fit inside the battery.

[0069] When the spacing between the pole core 20 and the spacer 30 is 0 mm, the spacer 30 has a poor effect of limiting the pole core 20 in the length direction. This embodiment provides an interference fit of 0.4 mm between the spacer 30 and the pole core 20, which can ensure the assembly difficulty between the pole core 20 and the spacer 30. The distance between the spacer 30 and the end face 201 of the pole core 20 should be less than 1.5 mm, which can ensure that there is sufficient interference fit between the spacer 30 and the pole core 20 to achieve the positioning of the pole core 20 in the length direction of the shell assembly.

[0070] The battery module according to the embodiment of the present application includes a mounting member and a plurality of battery cells 100 .

[0071] The battery cell 100 is the battery cell 100 of any of the above embodiments, and a plurality of battery cells 100 are disposed in the mounting member.

[0072] Specifically, the battery module includes a mounting member and multiple battery cells 100. The mounting member can be constructed as a square structure, and a mounting cavity is formed in the mounting member. Multiple battery cells 100 are all installed in the mounting cavity, and the multiple battery cells 100 can be arranged in sequence or spaced apart. The multiple battery cells 100 are used for synchronous charging and discharging so that the battery module can operate stably.

[0073] According to the battery module of this embodiment, the battery cell 100 includes a spacer 30 provided with a limiting member 302. The insulating member 40 protrudes from the electrode core 20 and is connected and fixed in the overlapping region of the spacer 30. This can largely limit the wobble of the spacer 30 in the thickness direction of the electrode core 20, reducing the performance impact of the wobble on the electrode tab 205. The insulating member 40 protrudes along the first direction X and is connected and fixed in the overlapping region of the spacer 30, which is conducive to improving the insulation performance between the housing assembly and the spacer 30. The two insulating members 40 are respectively attached to the first surface 203 of the electrode core 20, and the two insulating members 40 are overlapped and connected on the same side in the width direction of the electrode core 20. In this way, the insulating members 40 can separate the electrode core 20 from the housing assembly, thereby achieving insulation between the electrode core 20 and the housing assembly, enhancing the insulation stability between the electrode core 20 and the housing assembly, fully ensuring the flatness of the insulating member 40 and complete contact with the electrode core 20, and preventing failure of the insulating member 40.

[0074] The present application also proposes an electrical device.

[0075] According to an embodiment of the present application, an electric device includes the battery module described in any of the above embodiments. The electric device includes but is not limited to new energy vehicles, computer devices, etc.

[0076] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0077] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0078] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0080] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: A pole core (20), wherein an end surface (201) of the pole core (20) is provided with a pole ear (205); A housing assembly (11), the housing assembly (11) being used for mounting the pole core (20); A spacer (30), the spacer (30) comprising a spacer body (301) and a limiting member (302), the spacer body (301) being used to fix the tab (205), and the limiting member (302) being used to limit the spacer (30); an insulating member (40), the insulating member (40) being arranged between the pole core (20) and the housing assembly (11), the insulating member (40) being arranged to protrude from the pole core (20) along a first direction (X), the insulating member (40) at least partially overlapping with the spacer (30), and the overlapping portions of the insulating member (40) and the spacer (30) being connected and fixed; The first direction (X) is perpendicular to the end surface (201).

2. The battery cell according to claim 1, wherein: The limiting member (302) is arranged outside the spacer body (301), the limiting member (302) and the end face (201) of the pole core (20) are arranged at an angle, and the limiting member (302) is used to abut against the surface of the pole core (20) to limit the spacer (30).

3. The battery cell according to claim 1, wherein: The housing assembly (11) comprises a cover plate (101), a first limiting portion is provided on a side of the limiting member (302) facing the cover plate (101), and the cover plate (101) is provided with a positioning portion adapted to the first limiting portion.

4. The battery cell according to claim 1, wherein: The insulating member (40) is a multi-layer structure.

5. The battery cell according to claim 1 or 4, characterized in that: The insulating member (40) comprises a PP layer (402) and a PET layer (403), and the PP layer (402) is arranged on a side close to the pole core (20).

6. The battery cell according to any one of claims 1 to 5, characterized in that: The insulating member (40) comprises two insulating films (41), the two insulating films (41) being respectively attached to two first surfaces (203) oppositely disposed on the pole core (20), the area of ​​the first surface (203) being larger than the area of ​​the remaining surfaces of the pole core (20); The insulating film (41) is arranged to protrude from the pole core (20), and two insulating films (41) are overlapped and connected on the side surface (202) of the pole core (20) to cover the pole core (20).

7. The battery cell according to claim 6, characterized in that The insulating member (40) comprises a heat-sensitive layer (401), and the heat-sensitive layer (401) is suitable for being hot-melt-bonded with the insulating member (40) at a starting temperature.

8. The battery cell according to claim 6, characterized in that The length of the insulating film (41) protruding from the pole core (20) is L6, the gap between the pole core (20) and the housing assembly (11) is L5, and the height of the side surface of the pole core (20) is L7.

9. The battery cell according to any one of claims 1 to 5, characterized in that: The length of the pole core (20) along the first direction (X) is L1, the distance between the two oppositely arranged spacers (30) is L2, and 0.4 mm ≤ L2 - L1 ≤ 1.5 mm.

10. A battery module, characterized in that: include: Mounting parts; a plurality of battery cells (100), wherein the battery cells (100) are battery cells (100) according to any one of claims 1 to 9, A plurality of battery cells (100) are arranged in the mounting member.

11. An electrical device, characterized in that: Comprising the battery module according to claim 10.

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