Battery monomer, battery module and electric equipment

Abstract

The invention discloses a battery monomer, a battery module and electric equipment, the battery monomer comprises a pole core, a shell assembly and a space ring, the end face of the pole core is provided with a pole lug, the shell assembly is used for installing the pole core, the space ring comprises a space ring body and a limiting piece, the space ring body is used for fixing the pole lug, the limiting piece is configured to limit the shaking of the space ring, and the limiting piece is used for limiting the shaking of the space ring. The turnover of the buckled space ring in the thickness direction of the tab is reduced; the insulating part is arranged between the pole core and the shell assembly in an insulated and separated mode, the insulating part protrudes out of the pole core in the length direction of the pole core, the insulating part is fixedly connected with the overlapping area of the space ring, and the position of the space ring can be further limited. The insulating part comprises a thermosensitive layer and can be quickly assembled in a rolling mode of a hot pressing roller. The insulating part is a multi-layer composite film, so that the puncture strength of the insulating part can be improved, and the risk of degradation of the insulating part can be reduced.

Description

Technical Field

[0001] 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

[0002] Batteries are widely used in people's daily lives and have a significant impact on people's lives. With the gradual development of battery technology, batteries with good performance are increasingly sought after.

[0003] 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 core after being buckled. That is, when assembling components such as cover plates, 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

[0004] 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, which can limit the position of the spacer when assembling the battery cell.

[0005] 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 ear;

[0006] A housing assembly, the housing assembly being used to mount the pole core;

[0007] A spacer, the spacer comprising a spacer body and a stopper, the spacer body being used to fix the tab, and the stopper being used to limit the shaking of the spacer;

[0008] An insulating member, the insulating member is arranged 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,

[0009] The first direction is perpendicular to the end surface.

[0010] Optionally, the stopper is arranged outside the spacer body.

[0011] The limiting member is arranged at an angle with the end face 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.

[0012] 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 matched with the first limiting portion.

[0013] Optionally, the battery cell includes an insulating member, the insulating member is disposed between the pole core and the shell assembly, the insulating member protrudes from the pole core along a first direction, and the insulating member is connected and fixed to an overlapping area of ​​the spacer;

[0014] The first direction is perpendicular to the end surface of the pole core.

[0015] Optionally, the insulating member comprises a thermosensitive layer, and the thermosensitive layer is suitable for hot-melt bonding with the pole core at a starting temperature.

[0016] Optionally, the insulating element is a multi-layer structure.

[0017] 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.

[0018] 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;

[0019] 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.

[0020] Optionally, the length of the insulating film protruding from the pole core is L6, the gap between the pole core and the shell is L5, and the height of the side surface of the pole core is L7.

[0021]

[0022] Optionally, the length of the pole core along the first direction is L1, and the distance between the two oppositely disposed spacers is L2.

[0023] 0.4≤L2-L1≤1.5.

[0024] 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 installing other structural parts after the spacer 30 clamps the pole lug 205, so as to reduce the instability of the spacer 30 caused by the installation process to affect the performance of the pole lug 205. In addition, an insulating member 40 is provided between the pole core 20 and the shell assembly. The insulating member 40 is provided protruding from the pole core 20 in the direction opposite to the end face 201 where the pole lug 205 is provided, that is, the insulating member 40 is provided protrudingly along the length direction of the battery. The protruding insulating member 40 has an overlapping area with the spacer 30. Connecting and fixing the insulating member 40 and the spacer 30 in the overlapping area can improve the insulation performance of the battery cell, and can also reduce the situation where the spacer 30 flips in the thickness direction of the pole core 20 to a certain extent.

[0025] The present application also proposes a battery module. According to an embodiment of the present application, the battery module comprises a mounting member and a plurality of battery cells 100, wherein the battery cells are the battery cells described in any of the above embodiments, and the plurality of battery cells are arranged in the mounting member.

[0026] The application also proposes an electrical device.

[0027] The electrical equipment according to the embodiments of the present application includes the battery module described in any one of the embodiments above.

[0028] The advantages of the electrical equipment, the battery module and the above-mentioned battery cell 100 compared with the related art are the same, which will not be described in detail here.

[0029] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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:

[0031] Figure 1 is an exploded view of a battery cell provided in an embodiment of the present application;

[0032] Figure 2 is a schematic diagram of the structure of the spacer provided in an embodiment of the present application;

[0033] Figure 3 It is a structural schematic diagram of the assembly of a spacer ring with a limiting member and a pole core provided in an embodiment of the present application;

[0034] Figure 4 This is a schematic diagram of the structure of the insulating film assembly provided in the embodiment of the present application.

[0035] Figure 5 The multi-layer structure of the battery cell insulation member provided in the embodiment of the present application;

[0036] Figure 6 This is a schematic diagram of the hot pressing roller rolling assembly of the insulating film provided in the embodiment of the present application;

[0037] Figure 7 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;

[0038] Figure 8 It is a schematic diagram of the structure of the interference fit between the spacer ring and the pole core provided in the embodiment of the present application;

[0039] Reference numerals:

[0040] Battery cell 100,

[0041] Shell body 11, cover plate 101, pole 102,

[0042] Pole core 20, end face 201, side face 202, first surface 203, pole ear 205,

[0043] Spacer 30, spacer body 301, stopper 302,

[0044] Insulating member 40, insulating film 41, heat-sensitive layer 401, PP layer 402, PET layer 403, adhesive layer 404,

[0045] First direction X, second direction Y, third direction Z, hot pressing roller 50 . DETAILED DESCRIPTION

[0046] Embodiments of the present application are described in detail below, and examples of the embodiments 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.

[0047] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the various specific processes and examples of materials provided by the present application, but those of ordinary skill in the art can appreciate the applicability of other processes and / or the use of other materials.

[0048] The battery cell 100 according to the embodiment of the present application includes:

[0049] The pole core 20 has a pole ear 205 disposed on its end face 201.

[0050] A housing assembly, the housing assembly being used to mount the pole core,

[0051] The spacer 30 includes a spacer body 301 and a stopper 302. The spacer body 301 is used to fix the tab 205, and the stopper 302 is used to limit the shaking of the spacer 30.

[0052] An insulating member 40 is disposed between the pole core and the housing assembly, the insulating member protrudes from the pole core along a first direction X, and the insulating member is connected and fixed to an overlapping region of the spacer.

[0053] Specifically, according to Figure 1 As shown, the battery cell 100 of the embodiment of the present application includes a pole core 20, which includes six surfaces, namely two oppositely arranged end surfaces, a first surface and a side surface. The end surface is provided with a pole ear first surface; the first surface is generally called a large surface, which is larger than the area of ​​other surfaces, and two insulating films are attached to the large surface; on the side surface, the insulating film protrudes from the pole core and overlaps on the side surface to cover the pole core.

[0054] The pole core 20 is installed in the shell assembly, which includes a shell body 11 and a cover plate 101. The pole core 20 is accommodated in the shell body 11. The cover plate is provided with a pole column 102 for leading the electric energy of the pole core 20 to the electrical equipment. The cover plate 101 cooperates with the shell 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 can ensure that after the spacer 30 is buckled and fixed with the pole ear 205, the spacer 30 does not require additional workpieces and processes to position the spacer 30, which reduces the risk of the spacer 30 turning over in the thickness direction of the pole core 20 to a certain extent. 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 a 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 portion with the spacer 30. The spacer 30 and the overlapping area of ​​the insulating part 40 are connected and fixed. On the one hand, the insulating part 40 can be 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 posture 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.

[0055] In one embodiment, the limiter 302 is disposed outside the spacer body 301 , and the limiter 302 is disposed at an angle to the end surface 201 of the pole core 20 . The limiter 302 is used to abut against the surface of the pole core 20 to limit the shaking of the spacer 30 .

[0056] 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 .

[0057] 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 .

[0058] Specifically, according to Figure 2 , Figure 3As shown, the spacer body 301 includes a clamping portion, which is used to clamp and fix the pole ear 205. The clamping portion includes two clamping members, which are arranged opposite to each other, and the direction along the clamping members is the thickness direction of the pole core 20. One end face 201 of the clamping portion contacts the pole core 20, and the other end face 201 contacts the assembly welded to the battery cover 101, so as to realize the positioning of the pole core 20 in the first direction X. In addition, after the spacer 30 is buckled and fixed to the pole ear 205, it has an interference fit with the positive and negative pole ears 205, and no other workpiece is required to fix the spacer 30.

[0059] 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 with 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 flipping of the spacer ring 30 in the fastening direction after fastening.

[0060] 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.

[0061] 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 depression matched with 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 depression. There is no need to add additional positioning steps during the assembly process, the structure is simple, and the process is convenient.

[0062] In one embodiment, the insulating member 40 is a multi-layer structure.

[0063] Specifically, since the common insulating film 41 is made of a soft material and is easy to collapse, when the pole core 20 with the insulating film 41 is assembled into the shell assembly, the insulating film 41 will be pressed, and there may be a risk of poor insulation between the pole core 20 and the shell assembly. The multi-layer insulating member 40 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.

[0064] The insulating film 41 may be made of PP / PE / PET or other polyolefin films to ensure that the insulating film 41 has stable insulation properties.

[0065] 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.

[0066] Specifically, as is well known, the pole core 20 is alternately stacked by positive electrode sheets, diaphragms, and negative electrode sheets. Generally, the outermost side of the pole core 20 is the diaphragm, which covers the outermost negative electrode sheet. Since PET has good insulation properties, good chemical resistance, and good mechanical strength, it is widely used in the field of the insulation film 41 of the pole core 20. When the insulating member 40 is made of pure PET material, when the outermost diaphragm of the pole core 20 is pierced by foreign objects, the insulation film 41 of PET material will contact the outermost negative electrode sheet. When the PET material is in the presence of electrolyte and in contact with the negative electrode sheet, the mechanical properties will be weakened, that is, there is a risk of degradation. When the PP material is in the presence of electrolyte and in contact with the negative electrode sheet, the risk of degradation is relatively small, so the PP layer 402 is set on the side close to the pole 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 process 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 of the battery cell 100 process.

[0067] Furthermore, Figure 5 As shown, an adhesive layer 404 is provided between the PP layer 402 and the PET layer 403 to bond the PP layer 402 and the PET layer 403 together, so that the two layers are more firmly bonded.

[0068] 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, the insulating film 41 protrudes from the pole core 20, and 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.

[0069] Specifically, Figure 4 As shown, the insulating member 40 is arranged between the pole core 20 and the shell assembly. Since the gap between the shell assembly and the pole core 20 is small, scratches are prone to occur 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, and 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 on the largest first surface 203 by rolling with a hot pressing roller 50 can maximize the flatness of the fit. The insulating member 40 protrudes from the pole core, and 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.

[0070] 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.

[0071] 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.

[0072] 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。

[0073] In one embodiment, the insulating member 40 includes a thermosensitive layer 401 , and the thermosensitive layer 401 is suitable for hot-melt bonding with the pole core at a starting temperature.

[0074] Specifically, when the existing insulating part 40 is assembled with the pole core 20 or the shell assembly, it is usually necessary to use additional adhesives, which increases the corresponding production material cost and assembly cost. The insulating part 40 provided in this embodiment includes a thermosensitive layer, which can reduce the cost 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 thermosensitive layer 401, and the thermosensitive 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 the bonding of 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 the present application can be a thermoplastic polymer material of polyurethane or rubber material, and can also include a tackifier, a viscosity modifier, and an antioxidant for mixed use.

[0075] Furthermore, Figure 6 As shown, the insulating member 40 with a heat-sensitive layer provided by the present application can be assembled with the pole core 20 by rolling with a high-speed, low-pressure hot pressing roller 50, thereby improving the assembly efficiency and reducing the footprint of the corresponding assembly production line. The assembly process is simple by hot-melt bonding, and the insulation stability between the pole core 20 and the shell assembly can be effectively enhanced.

[0076] 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 shell 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:

[0077]

[0078] like Figure 7 As shown, it can be understood that in order to reduce the occurrence of flanging and wrinkling of 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

[0079] 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.

[0080] Specifically, Figure 8 As shown, 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, so as to realize the positioning of the pole core 20 in the length direction of the shell assembly, and considering the difficulty of assembly, it is necessary to limit the distance range between the spacer 30 and the end face 201 of the pole core 20 to 0.4mm≤L2-L1≤1.5mm. It can be understood 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 length of the pole core 20 and the spacer 30 being interference fit inside the battery.

[0081] When the spacing between the pole core 20 and the spacer ring 30 is 0 mm, the limiting effect of the spacer ring 30 on the pole core 20 in the length direction is not good. The present embodiment provides an interference fit between the spacer ring 30 and the pole core 20 of 0.4 mm, which can ensure the assembly difficulty between the pole core 20 and the spacer ring 30. The distance between the spacer ring 30 and the end face 201 of the pole core 20 should be less than 1.5 mm, which can ensure that there is enough interference fit between the spacer ring 30 and the pole core 20 to realize the positioning of the pole core 20 in the length direction of the shell assembly.

[0082] The battery module according to the embodiment of the present application includes a mounting member and a plurality of battery cells 100 .

[0083] 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.

[0084] Specifically, the battery module includes a mounting member and a plurality of battery cells 100. The mounting member can be constructed as a square structure. A mounting cavity is formed in the mounting member. The plurality of battery cells 100 are all mounted in the mounting cavity. The plurality of battery cells 100 can be arranged in sequence or spaced apart. The plurality of battery cells 100 are used for synchronous charging and discharging so that the battery module can operate stably.

[0085] According to the battery module of this embodiment, the battery cell 100 includes a spacer 30 provided with a limiting member 302, and the insulating member 40 is provided protruding from the pole core 20 and connected and fixed in the overlapping area of ​​the spacer 30, which can largely limit the shaking of the spacer 30 in the thickness direction of the pole core 20, and reduce the performance impact of the shaking on the pole ear 205. The insulating member 40 is provided protruding along the first direction X and connected and fixed in the overlapping area of ​​the spacer 30, which is conducive to improving the insulation performance between the shell assembly and the spacer 30. The two insulating members 40 are respectively attached to the first surface 203 of the pole core 20, and the two insulating members 40 are overlapped and connected on the same side of the width direction of the pole core 20. In this way, the pole core 20 can be separated from the shell assembly by the insulating member 40 to achieve insulation between the pole core 20 and the shell assembly, enhance the insulation stability between the pole core 20 and the shell assembly, fully ensure the flatness of the insulating member 40 and the complete fit with the pole core 20, and avoid the failure of the insulating member 40.

[0086] The application also proposes an electrical device.

[0087] The electric device according to the embodiment of the present application 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.

[0088] 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 referred device or element 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.

[0089] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0090] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0092] 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 spirit 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, wherein the end surface of the pole core is provided with a pole ear; A shell assembly, the shell assembly is used to install the pole core; A spacer, the spacer comprising a spacer body and a limiting member, the spacer body is used to fix the tab, and the limiting member is used to limit the spacer; An insulating member, the insulating member is arranged 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, The first direction is perpendicular to the end surface.

2. The battery cell according to claim 1, characterized in that: The limiting member is arranged outside the spacer body, and the limiting member is arranged at an angle with the end face of the pole core. The limiting member is used to abut against the surface of the pole core to limit the spacer.

3. The battery cell according to claim 1, characterized in that: The housing assembly comprises a cover plate, a first limiting portion is arranged on a side of the limiting member facing the cover plate, and the cover plate is provided with a positioning portion matched with the first limiting portion.

4. The battery cell according to claim 1, characterized in that: The insulating member is a multi-layer structure.

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

6. The battery cell according to claim 1, 4 or 5, characterized in that: The insulating member comprises two insulating films, the two insulating films are respectively attached to two 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 surface of the pole core; The insulating film is arranged to protrude from the pole core, and two insulating films are overlapped and connected on the side of the pole core to cover the pole core.

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

8. The battery cell according to claim 6, wherein the length of the insulating film protruding from the pole core is L6, the gap between the pole core and the shell is L5, and the height of the side surface of the pole core is L7.

9. The battery cell according to claim 1, characterized in that: 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≤L2-L1≤1.

5.

10. A battery module, characterized in that: include: Mounting parts; The plurality of battery cells are battery cells according to any one of claims 1 to 10, and the plurality of battery cells are arranged in the mounting member.

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

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