Battery cell, battery device, and electric device

Abstract

A battery cell, a battery device, and an electric device. The battery cell comprises a casing assembly, pole assemblies, a cell assembly, and an insulating support; the casing assembly has an accommodating cavity and comprises a first casing wall; each pole assembly comprises a pole body and a clamping structure, the clamping structure clamps the pole body, and the clamping structure is connected to the first casing wall; the insulating support comprises a support body and support members; first through holes are formed on the support body; conductive portions respectively pass through the corresponding first through holes; and each support member supports the side of the corresponding conductive portion facing a corresponding active substance coating portion.

Description

Battery cells, battery packs, and electrical devices Technical Field

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

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, batteries, as the power source, play an irreplaceable and crucial role. Among these, batteries, as a core component of new energy vehicles, have high requirements for reliability.

[0003] In related technologies, the cell components of a battery cell are prone to short circuits, which can affect the normal operation of the battery cell. Summary of the Invention

[0004] This application provides a battery cell, a battery device, and an electrical device. The battery cell can reduce the risk of short circuits in the battery cell assembly and has good reliability.

[0005] In a first aspect, embodiments of this application provide a battery cell, comprising: a housing assembly having a receiving cavity and including a first housing wall forming the receiving cavity; an electrode assembly including an electrode body and a clamping structure, the clamping structure clamping the electrode body and being connected to the first housing wall; a cell assembly housed in the receiving cavity and including an active material coating portion and a conductive portion, the conductive portion connecting the active material coating portion and the electrode body; and an insulating support disposed between the active material coating portion and the first housing wall, the insulating support including a support body and a support member, the support body having a first through hole, the conductive portion passing through the first through hole, and the support member supporting the side of the conductive portion facing the active material coating portion.

[0006] In the above technical solution, by setting a support member on the main body of the bracket, the support member can support the conductive part, so that the conductive part can maintain the preset shape, which is beneficial to make the shape and position of the conductive part controllable. At the same time, the support member can also block a part of the conductive part from the active material coating part, so as to reduce the probability of the conductive part being inserted into the active material coating part due to redundancy, thereby improving the reliability of the battery cell.

[0007] In some embodiments, the support member supports the portion of the conductive part that passes through the first through hole; or, the conductive part includes a first segment and a second segment, the first segment being connected between the active material coating portion and the second segment, the second segment passing through the first through hole, and the support member supporting the first segment. Thus, the specific position of the support member supporting the conductive part has a certain degree of flexibility, and the supporting arrangement of the support member and the arrangement of the conductive part passing through the first through hole are less likely to interfere with each other, facilitating convenient assembly of the battery cell.

[0008] In some embodiments, the conductive portion includes a bent section with an open groove. The opening of the open groove faces the side where the support member is located, and the support member extends into the open groove and abuts against the bent section. Alternatively, the opening of the open groove faces away from the side where the support member is located, and the support member abuts against the side of the bent section facing the active material coating portion.

[0009] In the above technical solution, the support member can provide certain support and / or pressure on the bent section so that the bent section can maintain the preset bending shape. This makes it easier to control the bending shape of the conductive part and the position of the bent section. At the same time, the support member can also block a part of the bent section from the active material coating part, so as to reduce the probability of the conductive part being inserted into the active material coating part due to redundancy, reduce the risk of short circuit in the battery cell, and improve the reliability of the battery cell.

[0010] In some embodiments, the support member is cantilevered, with its fixed end connected to the wall of the first perforation, and its free end abutting against the bent section; alternatively, the support member is located on the side of the support body facing the active material coating portion, and both ends of the support member in the width direction of the first shell wall are respectively connected to openings into different conductive portions. Thus, the support member provides good design flexibility while supporting the conductive portions, adapting to different needs.

[0011] In some embodiments, multiple battery cell assemblies are arranged sequentially along the width direction of the first housing wall. Each battery cell is configured to satisfy any one of the following conditions: Condition A1, the conductive portions of all battery cell assemblies of the same polarity converge and connect to form a first convergence portion, which has a bent section; Condition A2, the terminal post assembly corresponds to the middle position of the multiple battery cell assemblies in the width direction of the first housing wall, and the conductive portions of the battery cell assemblies of the same polarity on the same side of the middle position converge and connect to form a second convergence portion, which also has a bent section. Therefore, the battery cell design is flexible, and different arrangements of the conductive portions of the battery cell assemblies can be constrained by matching support members.

[0012] In some embodiments, the battery cell satisfies condition A2, with the middle position having a first side and a second side on either side of the first shell wall width direction, and multiple supports including a first support and a second support spaced apart in the first shell wall length direction. The first support and the second support respectively abut against the conductive portions of the same polarity of different battery cell assemblies. The first support is located on the first side, and the second support is located on the second side. A portion of the bent section corresponding to the battery cell assembly located on the first side extends to the second side of the middle position. The second support abuts against the side of the bent section corresponding to the battery cell assembly located on the first side facing the active material coating portion. A portion of the bent section corresponding to the battery cell assembly located on the second side extends to the first side of the middle position, and the first support abuts against the side of the bent section corresponding to the battery cell assembly located on the second side facing the active material coating portion.

[0013] In the above technical solution, by setting a first support member and a second support member that are opposite to each other in the width direction and staggered in the length direction of the first shell wall, the first support member abuts the conductive part of the battery cell assembly located on one side of the middle position, and the second support member abuts the conductive part of the battery cell assembly located on the other side of the middle position. This allows the support members to provide support and / or pressure on the conductive parts, while also ensuring that the arrangement of the support members can adapt to the arrangement requirements of the conductive parts of the battery cell assembly, thus matching the arrangement of the support members with the arrangement of the conductive parts. In addition, the setting of the first and second support members can also realize an arrangement in which the conductive parts of all battery cell assemblies converge directly towards the middle position, which is beneficial to appropriately shorten the length of the conductive parts, save space occupied by the conductive parts, reduce the redundancy of the conductive parts, and facilitate the connection between the conductive parts and the terminal assembly.

[0014] In some embodiments, the battery cell satisfies condition A2, with the middle portion located on two sides of the first shell wall width direction as a first side and a second side, respectively. The support member's two ends, in the first shell wall width direction, respectively abut against the conductive portions of different cell assemblies of the same polarity. One end of the support member extends into the opening groove of the bent section on the first side, and the other end of the support member abuts against the conductive portion of the cell assembly on the second side. In the above technical solution, by setting the support member to extend into different opening grooves at both ends of the first shell wall width direction to abut against the conductive portions of different cell assemblies, it is convenient that the support member can abut against the conductive portions of all cell assemblies, facilitating the dispersed arrangement of the conductive portions of all cell assemblies, and helping to save the number of support members and simplify the structure of the battery cell.

[0015] In some embodiments, the support member extends from both ends of the first shell wall in the width direction toward the end of the support body to the end adjacent to the end of the support body, and the two ends of the support member and the end of the support body respectively define a second through hole for the conductive part to pass through. In the above technical solution, the conductive part passes through the second through hole, so the end of the support member and the end of the support body can respectively press and gather the conductive part, restricting the conductive part, so that the conductive part can maintain a preset gathered shape. Moreover, since the second through hole is located at the end of the support body, the second through hole is relatively close to the root position of the active material coating part of the bent section, which helps to make the root of the active material coating part of the bent section more compact, and further reduces the probability of the bent section spreading out.

[0016] In some embodiments, the support member includes a first plate portion and two second plate portions, which are respectively disposed at both ends of the first plate portion. Each second plate portion defines a second through hole with the support body, and the two second plate portions extend inclined towards the support body in a direction away from each other. Thus, by setting the two second plate portions to extend inclined towards the support body in a direction away from each other, the distance between the second plate portions and the active material coating portion can accommodate the space required by the second gathering portions on both sides. This allows the second plate portions to both avoid the root of the second gathering portions to a certain extent, while also compressing and restricting the root position of the second gathering portions.

[0017] In some embodiments, the insulating support further includes a pressing member disposed opposite to and spaced apart from the support member. The conductive portion passes through the gap between the support member and the pressing member, and the pressing member presses against the side of the conductive portion facing the active material coating portion. Thus, by providing the pressing member, the conductive portion is easily sandwiched between the support member and the pressing member. The pressing member and the support member cooperate to gather the conductive portion, which further helps to maintain the conductive portion in a preset gathered and extended shape, and the conductive portion is more tightly gathered, further reducing the probability of the conductive portion spreading out. In particular, the conductive portion includes tabs, and the tabs include multiple stacked tab pieces. The tabs pass through the support member and the pressing member, which helps to maintain the shape of the tabs and reduce the probability of the tabs spreading out.

[0018] In some embodiments, the conductive portion includes a bent section with an open groove. A support member corresponding to the pressing member extends into the open groove and abuts against the bent section. The pressing member abuts against the side of the bent section opposite to the active material coating. In the above technical solution, the pressing member and the support member cooperate, with the support member extending into the open groove and the pressing member abutting against the side of the bent section opposite to the active material coating. This restricts a portion of the bent section between the support member and the pressing member. The pressing member and the support member cooperate to bring the bent section together, further ensuring that the bent section maintains a preset convergence and bending shape, and making the bent section more compact, further reducing the probability of the bent section spreading out.

[0019] In some embodiments, the bracket body and the support member are an integral piece; or, the bracket body and the support member are separate pieces, and are fixed by heat fusion, snap-fit, or adhesive bonding. Therefore, the forming methods of the bracket body and the support member are flexible and easy to adapt to different needs.

[0020] In some embodiments, the clamping structure is integrally formed on the first shell wall; or, the clamping structure is welded to the first shell wall. Therefore, the connection method between the clamping structure and the first shell wall is flexible and can easily meet different practical needs.

[0021] In some embodiments, the support body further includes a partition portion surrounding the first through hole. A clamping structure is welded to the first shell wall, and the welding position of the clamping structure and the first shell wall is opposite to the partition portion along the thickness direction of the first shell wall, so that the partition portion separates the welding position of the clamping structure from the active material coating portion. Therefore, by providing a partition portion on the support body located between the first shell wall and the active material coating portion, with the partition portion surrounding the first through hole for the conductive portion to pass through, and the welding position of the electrode assembly to the first shell wall opposite to the partition portion, so that the partition portion separates the welding position from the active material coating portion, the partition portion can catch the welding slag at the welding position during the battery cell assembly process or during use, preventing the welding slag from falling onto the active material coating portion, reducing the possibility of welding slag piercing the active material coating portion, reducing the possibility of welding slag piercing the electrode sheet and separator, and improving the reliability of the battery cell.

[0022] In some embodiments, the separator has an annular groove, which is open on the side facing the welding position. In the above embodiment, by opening the annular groove on the separator towards the welding position, welding slag can fall from the open side of the groove into the groove. The groove wall can limit and guide the welding slag falling into it. At the same time, the groove is designed to improve the separator's ability to collect welding slag, further reducing the probability of welding slag falling onto the active material coating part and improving the reliability of the battery cell.

[0023] In some embodiments, the partition includes a first portion and a second portion, the first portion being opposite to the welding position along the thickness direction of the first shell wall, and the second portion being bent and connected to one end of the first portion away from the central axis of the first perforation and extending toward the welding position.

[0024] In the above technical solution, by setting the partition part including a first part and a second part, the first part is connected to the end of the second part away from the welding position, which facilitates the processing of the partition part and the forming of the groove.

[0025] In some embodiments, the partition is configured as a flat plate structure. In the above technical solutions, the partition has a simple structure and is easy to manufacture.

[0026] In some embodiments, a liquid injection hole is formed on the first shell wall, and a liquid injection channel is formed on the support body. The liquid injection channel penetrates the side surface of the support body facing the first shell wall to form a liquid inlet. The liquid inlet is opposite to the liquid injection hole. The side of the liquid injection channel facing the active material coating part is at least partially closed. The peripheral wall of the liquid injection channel and / or the side wall of the liquid injection channel facing the active material coating part are formed with a liquid outlet. The liquid outlet communicates with the space between the support body and the active material coating part.

[0027] In the above technical solution, an injection hole is provided on the first shell wall and an injection channel is provided on the support body, so that electrolyte can be injected into the receiving cavity through the injection hole and the injection channel. Of course, if the sealing structure at the injection hole is configured to open the injection hole, the electrolyte in the receiving cavity can also be discharged through the injection hole and the injection channel. Moreover, since the side of the injection channel facing the active material coating part is at least partially closed, the closed part of the injection channel facing the active material coating part can play a certain blocking role for the electrolyte during the injection process, so that the electrolyte does not directly impact the active material coating part, which is beneficial to improving the reliability of the battery cell.

[0028] In some embodiments, the support body further includes a support portion and a connecting portion. In the thickness direction of the first shell wall, the thickness of the support portion is greater than the thickness of the connecting portion, so that the support portion protrudes from the connecting portion toward the active material coating portion. There are n support portions, which are spaced apart along the length direction of the first shell wall, where n≥3 and n is a positive integer. A connecting portion connects two adjacent support portions. The support portion abuts between the first shell wall and the active material coating portion. A first perforation is formed on the connecting portion.

[0029] In the above technical solution, by setting three or more support parts, and with the support parts protruding from the connection part towards the active material coating part, the support body can form multiple support points between the first shell wall and the active material coating part, thereby improving the insulation between the first shell wall and the active material coating part, and facilitating the enhancement of the structural and dimensional stability of the battery cell, reducing the risk of damage to the cell assembly, and providing clearance for the placement of conductive parts; in addition, it facilitates the establishment of a suitable stop area between the support body and the cell assembly. This stop area is not too large, which could easily affect the smoothness of venting during thermal runaway of the cell assembly, and it is not too small, which could easily damage the cell assembly, thus improving the reliability of the battery cell.

[0030] In some embodiments, at least one support portion has a weight-reducing structure. In the above technical solution, by providing a weight-reducing structure on the support portion, it is beneficial to save material usage in the support body, reduce the weight of the support body, and simultaneously save the volume of the support body, reducing the occupancy of the insulating support on the receiving cavity, thereby helping to reduce the weight of the battery cell and increase the energy density of the battery cell.

[0031] In some embodiments, the weight-reduction structure includes: a discharge channel extending along the length of the first shell wall to opposite sides of the portion of the corresponding support protruding from the connecting portion; and / or, a weight-reduction hole, which is closed at both ends along the length of the first shell wall. In the above technical solution, by including the discharge channel in the weight-reduction structure, the discharge channel achieves both a lightweight design for the insulating support and smooth pressure relief for the battery cells, serving multiple purposes. By including the weight-reduction hole in the weight-reduction structure, the weight-reduction hole achieves a lightweight design for the insulating support without significantly affecting the support effect of the support portion. Furthermore, the discharge channel can appropriately increase the width of the support portion to a certain extent; for example, the width of the support portion can be equal to the width of the connecting portion, facilitating the support portion's ability to support the entire cell assembly in the width direction.

[0032] In some embodiments, the weight reduction structure includes an exhaust channel and a weight reduction hole, at least one of which is a plurality of weight reduction channels and weight reduction holes, and the exhaust channels and weight reduction holes are alternately arranged in the width direction of the first shell wall.

[0033] In some embodiments, the weight reduction structure includes a discharge channel and a weight reduction hole. Both the discharge channel and the weight reduction hole are open on the side facing away from the active material coating portion and closed on the side facing the active material coating portion. In the above technical solution, by alternately arranging the discharge channel and the weight reduction hole in the width direction of the first shell wall, it is easier to achieve a balanced distribution of the support strength at both ends of the support portion in the length direction of the first shell wall. This helps to improve the overall support strength at both ends of the support portion in the length direction of the first shell wall, enabling the support portion to reliably support the battery cell assembly while simultaneously meeting the requirements for weight reduction and pressure relief.

[0034] In some embodiments, the support portion corresponding to the side of the discharge channel and weight reduction hole facing the active material coating portion is flush with the support portion. In the above technical solution, by setting the support portion flush with the side of the discharge channel and weight reduction hole facing the active material coating portion, the support portion can provide a larger and flatter surface on the side facing the active material coating portion. The arrangement of the discharge channel and weight reduction hole is less likely to affect the support portion's support of the battery cell assembly, thus improving the support effect of the support portion on the battery cell assembly.

[0035] In some embodiments, a connecting hole is formed on the weight-reducing structure, the connecting hole connecting the support portion to opposite sides in the first shell wall thickness direction, the weight-reducing structure includes a discharge channel, the discharge channel is closed on one side in the first shell wall thickness direction, and a connecting hole is formed on the closed side of the discharge channel in the first shell wall thickness direction; and / or, the weight-reducing structure includes a weight-reducing hole, the weight-reducing hole is closed on one side in the first shell wall thickness direction, and a connecting hole is formed on the closed side of the weight-reducing hole in the first shell wall thickness direction.

[0036] In the above technical solution, by providing a connecting hole, the electrolyte on the side of the support portion away from the active material coating portion can flow through the connecting hole to the side where the active material coating portion is located, so as to wet the active material coating portion and make full use of the electrolyte in the cavity; at the same time, since the connecting hole is formed on the weight reduction structure, it can make full use of the space provided by the support portion, which is conducive to saving the space occupied by the support portion. Combined with the arrangement of the weight reduction structure being closed on one side in the first shell wall thickness direction and the connecting hole being formed on the closed side, it is convenient to process and form the weight reduction structure and the connecting hole.

[0037] In some embodiments, the plurality of support portions include a first support portion, a second support portion, and a third support portion. The first and second support portions are located at opposite ends of the length of the support body, and the third support portion is spaced between the first and second support portions. A pressure relief structure is provided on the first shell wall, and the third support portion is opposite to the pressure relief structure. A discharge channel and a connecting hole are formed on the third support portion. Each of the first and second support portions is provided with a discharge channel, a weight reduction hole, and a connecting hole. Thus, while ensuring that the first, second, and third support portions reliably support the cell assembly, the functions of the aforementioned support portions are enriched, which is beneficial to improving the reliability of the battery cells.

[0038] In some embodiments, the terminal assembly further includes an insulating structure that is insulated and sealed between the clamping structure and the terminal body. In the above technical solution, the terminal assembly has a simple structure, is easy to manufacture, and since it comprises both a terminal body and a clamping structure, the shape and size of the terminal body and the clamping structure can be designed separately based on different factors to flexibly adapt to the connection requirements of different types of housing assemblies and cell assemblies, thus increasing the applicability of the terminal assembly.

[0039] In some embodiments, the insulating structure includes a seal surrounding the pole body, with at least a portion of the seal clamped between the clamping structure and the pole body in the thickness direction of the first housing wall. Thus, by clamping at least a portion of the seal between the clamping structure and the pole body in the inward and outward directions of the first housing wall, an axial seal is achieved between the clamping structure and the pole body. This axial seal provides a more reliable sealing effect and improves the leakage problem at the mating position of the clamping structure and the pole body. Furthermore, by integrating the axial seal, such as a axial portion, into the pole assembly, the embodiments of this application can reduce the axial force on the first housing wall.

[0040] In some embodiments, the first housing wall has a mounting hole, the pole assembly covers the mounting hole, and the outer periphery of the clamping structure is overlapped and welded to one side of the first housing wall surrounding the mounting hole in the thickness direction of the first housing wall. Thus, by covering one side of the first housing wall in the thickness direction, i.e., covering the outer side of the first housing wall, or covering the inner side of the first housing wall, the assembly of the clamping structure with the first housing wall is facilitated.

[0041] In some embodiments, the outer periphery of the clamping structure has a flange, and a groove surrounding the mounting hole is formed on the first shell wall, with the flange engaging with the groove. This facilitates the support and positioning of the connection between the clamping structure and the first shell wall, and allows for welding the two together from the outside of the first shell wall, i.e., the side away from the active material coating.

[0042] In some embodiments, the terminal assembly forms a receiving groove that is recessed relative to the first shell wall in a direction away from the cell assembly and open towards the cell assembly, with at least a portion of the conductive part received in the receiving groove. In the above technical solution, by providing a receiving groove to accommodate the conductive part, the space occupied by the conductive part in the receiving cavity can be reduced, allowing the receiving cavity to have a larger space to accommodate the active material coating part. This is beneficial for increasing the volume of the active material coating part, thereby increasing the energy density of the battery cell. Furthermore, since the receiving groove is open towards the cell assembly, the conductive part can easily extend into the receiving groove, reducing operational difficulty.

[0043] In some embodiments, the housing assembly includes a housing body and a housing cover. The housing body is a single piece with one end open, and the housing cover is located at the open end of the housing body. The end of the housing body opposite to the housing cover is a first housing wall; or, the housing cover is the first housing wall. In the above technical solutions, the structural design of the housing assembly is flexible, and the placement position of the pole post assembly is flexible.

[0044] In some embodiments, the battery cell further includes a pressure relief structure disposed on the housing assembly and located on the same side or opposite side of the terminal assembly. In the above technical solutions, when the pressure relief structure and the terminal assembly are located on the same side, the design of the other housing walls besides the first housing wall can be simplified, thus simplifying the structure and processing of the battery cell. When the pressure relief structure and the terminal assembly are located on opposite sides, there is no need to consider the space occupied by the pressure relief structure on the first housing wall, thereby reducing the volume of the terminal assembly and allowing for flexible design of the shape and volume of the terminal assembly as needed.

[0045] Secondly, embodiments of this application provide a battery device including the aforementioned battery cell.

[0046] In the above technical solution, the performance of the battery device can be improved by using the aforementioned battery cells.

[0047] Thirdly, embodiments of this application provide an electrical device, including the battery device described above.

[0048] In the above technical solution, the improved performance of the battery device helps to enhance the working performance of the electrical device. Attached Figure Description

[0049] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0051] Figure 2 is an exploded view of a battery provided in some embodiments of this application;

[0052] Figure 3 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0053] Figure 4 is an exploded view of the battery cell shown in Figure 3;

[0054] Figure 5 is a schematic diagram of a battery cell provided in some embodiments of this application;

[0055] Figure 6 is a cross-sectional view along line CC in Figure 5;

[0056] Figure 7 is a cross-sectional view of the pole assembly shown in Figure 6;

[0057] Figure 8 is a schematic diagram of a battery cell provided in some other embodiments of this application;

[0058] Figure 9 is a schematic diagram of a battery cell provided in some embodiments of this application;

[0059] Figure 10 is a cross-sectional view along line DD in Figure 9;

[0060] Figure 11 is a schematic diagram of a battery cell provided in some embodiments of this application;

[0061] Figure 12 is a cross-sectional view along line EE in Figure 11;

[0062] Figure 13 is a schematic diagram of an insulating bracket provided in some embodiments of this application;

[0063] Figure 14 is an enlarged view of part A circled in Figure 5;

[0064] Figure 15 is a partial schematic diagram of the insulating support shown in Figure 5;

[0065] Figure 16 is another schematic diagram of the insulating support shown in Figure 5;

[0066] Figure 17 is another schematic diagram of the insulating support shown in Figure 5;

[0067] Figure 18 is another schematic diagram of the insulating support shown in Figure 5;

[0068] Figure 19 is a cross-sectional view along line BB in Figure 8;

[0069] Figure 20 is an assembly diagram of the first shell wall, pole post assembly and insulating bracket provided in some embodiments of this application;

[0070] Figure 21 is another assembly schematic diagram of the first shell wall, pole assembly and insulating support shown in Figure 20;

[0071] Figure 22 is another assembly diagram of the first shell wall, pole assembly and insulating support shown in Figure 20;

[0072] Figure 23 is an assembly diagram of the first shell wall, pole assembly, insulating support and adapter shown in Figure 20;

[0073] Figure 24 is another assembly diagram of the first shell wall, pole assembly, insulating support and adapter shown in Figure 23;

[0074] Figure 25 is another assembly diagram of the first shell wall, pole assembly, insulating bracket, adapter and support shown in Figure 23;

[0075] Figure 26 is a schematic diagram of the support member shown in Figure 25;

[0076] Figure 27 is another schematic diagram of the support shown in Figure 26.

[0077] Reference numerals: Battery cell 100, Battery assembly 200, Controller 300, Motor 400, Electrical device 500, Housing 101, First housing section 1011, Second housing section 1012, Welding position R1, Middle position R2, Housing assembly 1, Receiving cavity 10, First housing wall 11, Mounting hole 111, Submersible groove 112, Injection hole 113, Housing body 12, Opening 121 13. Shell cover, 2. Terminal assembly, 20. Receiving groove, 21. Terminal body, 22. Clamping structure, 22a. Flange, 221. First adapter ring, 222. Second adapter ring, 223. Insulating frame, 23. Insulating structure, 231. Seal, 231a. Cell assembly, 3. Active material coating, 31. Conductive part, 32. First gathering part, 32a. Second gathering part, 32b. Bending section, 321. Opening groove, 321a. First extension section, 3211. Second extension section, 3212. Transition section, 3213. Terminal tab, 322. Adapter, 323. First section, 324. Second section, 325. Insulating bracket, 4. Two perforations 40, bracket body 41, first perforation 411, partition 412, groove 412a, first part 4121, second part 4122, liquid injection channel 413, liquid inlet 413a, liquid outlet 413b, support part 414, first support part 4141, second support part 4142, third support part 4143, weight reduction structure 4144, discharge channel 4144a, weight reduction hole 4144b, connecting hole 4145, connecting part 415, support member 421, buckle 4210, first plate part 4211, second plate part 4212, pressing member 422, pressure relief structure 5. Detailed Implementation

[0078] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, all implementation methods and optional implementation methods of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.

[0079] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0080] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0081] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0082] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0083] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of the various components shown in the accompanying drawings in the embodiments of this application are merely illustrative and should not constitute any limitation on this application.

[0084] In this application, "multiple" means two or more (including two).

[0085] In this application, the battery cell may include lithium-ion rechargeable batteries (rechargeable batteries are battery cells that can be recharged after discharge to activate the active materials and continue to be used), lithium-ion primary batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this application embodiment is not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and this application embodiment is not limited to these. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to these.

[0086] For example, a single battery cell typically includes a casing, a cell assembly, and an electrolyte. The casing houses the cell assembly and the electrolyte, and has at least one positive electrode post and at least one negative electrode post. The cell assembly may be one or more, and is formed by stacking or winding positive electrode sheets, negative electrode sheets, and a separator.

[0087] The positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and form an electrical connection with the positive electrode post. For example, the multiple stacked positive electrode tabs can be directly soldered to the positive electrode post to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter piece. The multiple stacked positive electrode tabs are soldered to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece is soldered to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0088] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the battery cell assembly may also include a negative electrode adapter piece. The stacked negative electrode tabs are welded to one end of the negative electrode adapter piece, and the other end of the negative electrode adapter piece is welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0089] The pressure relief structure on the battery cell mentioned in this application is used to release the gas inside the battery cell when the internal pressure is too high (e.g., due to overcharging), thereby reducing the internal pressure of the battery cell and preventing it from exploding due to excessively rapid pressurization. For example, the pressure relief structure can be an explosion-proof valve, an explosion-proof plate, etc.; the pressure relief structure can be an integral part of the battery cell housing or a separate part.

[0090] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0091] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0092] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing. Alternatively, the battery device may not include a housing.

[0093] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module into the housing. Alternatively, the battery cell assembly can be housed in a housing by directly fixing multiple battery cells to the housing.

[0094] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, batteries, as the power source, play an irreplaceable and crucial role. Among these, batteries, as a core component of new energy vehicles, have high requirements for reliability.

[0095] In related technologies, the cell components of a battery cell are easily punctured by particulate matter, affecting the normal operation of the battery cell. For example, the terminal components of a battery cell are usually fixed to the housing component by welding. Weld slag generated from welding the terminal components to the housing component can easily fall onto the cell component, affecting the normal use of the cell component.

[0096] Based on the above considerations, in order to suppress the thermal diffusion of the battery, a battery cell is proposed, including a housing assembly, a terminal assembly, a cell assembly, and an insulating support. The housing assembly has a receiving cavity and includes a first shell wall that participates in forming the receiving cavity. The terminal assembly includes a terminal body and a clamping structure. The clamping structure clamps the terminal body and is connected to the first shell wall. The cell assembly is housed in the receiving cavity and includes an active material coating portion and a conductive portion. The conductive portion connects the active material coating portion and the terminal body. The insulating support is disposed between the active material coating portion and the first shell wall. The insulating support includes a support body and a support member. The support body has a first through hole, and the conductive portion passes through the first through hole. The support member supports the side of the conductive portion facing the active material coating portion.

[0097] In the above technical solution, by setting a support member on the main body of the bracket, the support member can support the conductive part, so that the conductive part can maintain the preset shape, which is beneficial to make the shape and position of the conductive part controllable. At the same time, the support member can also block a part of the conductive part from the active material coating part, so as to reduce the probability of the conductive part being inserted into the active material coating part due to redundancy, thereby improving the reliability of the battery cell.

[0098] This application provides an electrical device that uses the battery cell or battery device disclosed herein as a power source. The electrical device can be, but is not limited to, mobile phones, portable devices, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0099] For ease of explanation, the following embodiments use a vehicle as an example to describe the structure of the electrical device 700, battery device 200, and battery cell 100 of this application.

[0100] Please refer to Figure 1, which is a schematic diagram of the structure of an electrical device 700 provided in some embodiments of this application as a vehicle. The vehicle can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle is equipped with a battery device 200, which can be located at the bottom, front, or rear of the vehicle. The battery device 200 can be used to supply power to the vehicle; for example, the battery device 200 can serve as the vehicle's operating power source. The vehicle may also include a controller 300 and a motor 400. The controller 300 is used to control the battery device 200 to supply power to the motor 400, for example, to meet the power needs of vehicle starting, navigation, and driving. In some embodiments of this application, the battery device 200 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0101] In some embodiments, the housing 101 of the battery device 200 may be part of the vehicle's chassis structure. For example, a portion of the housing 101 may be at least a portion of the vehicle's floor, or a portion of the housing 101 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0102] Please refer to Figure 2, which is an exploded view of the structure of a battery cell 100 used in a battery device 200 according to some embodiments of this application. The battery device 200 includes a housing 101 and a plurality of battery cells 100, with the battery cells 100 housed within the housing 101. The housing 101 provides assembly space for the battery cells 100, and can employ various structures. In some embodiments, the housing 101 may include a first housing 1011 and a second housing 1012, which overlap each other, together defining a receiving cavity for accommodating the battery cells 100. In this case, a closed space is formed inside the housing 101 to accommodate the battery cells 100; here, "closed" refers to covering or shutting off, and can be either sealed or unsealed. The second housing 1012 can be a hollow structure open at one end, and the first housing 1011 can be a plate-like structure. The first housing 1011 covers the open side of the second housing 1012 so that the first housing 1011 and the second housing 1012 together define a receiving cavity; or, the first housing 1011 and the second housing 1012 can both be hollow structures open on one side (as shown in Figure 2), with the open side of the first housing 1011 covering the open side of the second housing 1012. Of course, the housing 101 formed by the first housing 1011 and the second housing 1012 can be of various shapes, such as a cylinder or a cuboid.

[0103] As an example, the housing 101 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 101 forms a closed space to accommodate the battery cell 100; the first housing 1011 may be either a top cover or a bottom plate.

[0104] In the battery device 200, multiple battery cells 100 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 100 are connected in both series and parallel configurations. Multiple battery cells 100 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 100 is housed within the housing 101. Alternatively, the battery device 200 can also be composed of multiple battery cells 100 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 101. The battery device 200 may also include other structures; for example, the battery device 200 may also include a busbar for realizing the electrical connection between the multiple battery cells 100.

[0105] Please refer to Figure 3, which is a schematic diagram of the structure of a battery cell provided in some embodiments of this application. The battery cell 100 is a cuboid, with its height direction being the third direction Z, its length direction being the second direction Y, and its thickness direction being the first direction X. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other; however, this is not a limitation. In other embodiments of this application, the battery cell 100 may also be a polygonal prism, a flat body, or other shapes.

[0106] In the following description of this application, the length direction of the first shell wall 11 is taken as the second direction Y, the width direction of the first shell wall 11 is taken as the first direction X, and the thickness direction of the first shell wall 11 is taken as the third direction Z. Other embodiments can be easily understood by those skilled in the art after reading the following description.

[0107] Please refer to Figures 3-4. In this embodiment of the application, the battery cell 100 includes a housing assembly 1, a terminal assembly 2, and a cell assembly 3.

[0108] Exemplarily, the housing assembly 1 includes a housing body 12 and a housing cover 13. The housing cover 13 closes onto the opening of the housing body 12 to isolate the internal environment of the battery cell 100 from the external environment. The shape of the housing cover 13 may be adapted to the shape of the housing body 12 to fit the housing body 12. Optionally, the housing cover 13 may be made of a material with a certain hardness and strength (such as aluminum alloy), so that the housing cover 13 is less prone to deformation under pressure and impact, enabling the battery cell 100 to have higher structural strength and improved reliability. The terminal assembly 2 may be disposed on the housing body 12 or the housing cover 13, and the terminal assembly 2 can be used to output or input electrical energy from the battery cell 100. The housing body 12 is an assembly used to cooperate with the housing cover 13 to form the internal environment of the battery cell 100, wherein the formed internal environment can be used to accommodate the cell assembly 3, electrolyte, and other components. The housing 12 and the cover 13 can be independent components. An opening 121 can be provided on the housing 12. The cover 13 can be closed at the opening 121 to form the internal environment of the battery cell 100. Alternatively, the cover 13 and the housing 12 can be integrated. Specifically, the cover 13 and the housing 12 can form a common connection surface before other components are inserted into the housing. When it is necessary to encapsulate the inside of the housing 12, the cover 13 can be closed to seal the housing 12.

[0109] In the embodiments of this application, the housing assembly 1 has a receiving cavity 10, and the housing assembly 1 includes a first housing wall 11, which helps to form the receiving cavity 10. Exemplarily, the terminal assembly 2 is mounted on the first housing wall 11, the first housing wall 11 has a mounting hole 111, the terminal assembly 2 is disposed at the mounting hole 111, and the welding position R1 between the terminal assembly 2 and the first housing wall 11 is located at the hole wall position of the mounting hole 111. Here, "the terminal assembly 2 is mounted on the first housing wall 11" means that the terminal assembly 2 and the first housing wall 11 have an assembly connection relationship, such as welding or riveting. Thus, the housing assembly 1 and the terminal assembly 2 are separate components, assembled and connected, allowing for separate processing of the housing assembly 1 and the terminal assembly 2, facilitating their processing and also aiding in the manufacturing of the battery cell 100. Of course, in other examples, a portion of the housing assembly 1 and a portion of the terminal assembly 2 can also be integrally formed.

[0110] The pole assembly 2 includes a pole body 21 and a clamping structure 22. The clamping structure 22 clamps the pole body 21 and is connected to the first shell wall 11 so that the pole body 21 is connected to the first shell wall 11 through the clamping structure 22, thereby realizing the installation of the pole body 21. For example, the clamping structure 22 can surround the pole body 21 around the circumference of the mounting hole 111 on the first shell wall 11. The clamping structure 22 can connect the pole body 21 and the first shell wall 11 in the outer peripheral area of ​​the pole body 21.

[0111] The battery cell assembly 3 is housed in the receiving cavity 10. It is understood that the receiving cavity 10 may contain one or more battery cell assemblies 3. The battery cell assembly 3 includes an active material coating portion 31 and a conductive portion 32. The conductive portion 32 connects the active material coating portion 31 and the terminal body 21, enabling the input or output of electrical energy from the battery cell 100. Exemplarily, the battery cell assembly 3 includes a positive electrode, a negative electrode, and a separator. The separator is disposed between the positive and negative electrode. The portions of the positive and negative electrode with active material are respectively coated with the active material 31, and the portions of the positive and negative electrode without active material each form a tab. The conductive portion 32 includes the tab. In this embodiment, the connection method between the terminal body 21 and the conductive portion 32 is not specifically limited; for example, the terminal body 21 and the conductive portion 32 can be welded or riveted.

[0112] Please refer to Figures 4, 6, 10, and 12. In the embodiments of this application, the battery cell 100 further includes an insulating support 4. The insulating support 4 is housed in the receiving cavity 10 and is disposed on the side of the active material coating portion 31 facing the first shell wall 11. This allows the insulating support 4 to support the cell assembly 3, thereby separating the active material coating portion 31 from the first shell wall 11 and reducing the probability of contact between them. This helps to reduce the risk of corrosion of the first shell wall 11 due to exposure of the active material coating portion 31, reduces the risk of leakage, and improves the reliability and stability of the battery cell 100. It can be seen that the insulating support 4 is disposed between the active material coating portion 31 and the first shell wall 11.

[0113] The insulating support 4 includes a support body 41, which has a first through hole 411. A conductive part 32 passes through the first through hole 411, so that the conductive part 32 can extend from the side of the support body 41 away from the first shell wall 11 through the first through hole 411 to the side of the support body 41 facing the first shell wall 11 to be electrically connected to the pole body 21. The support body 41 also has a support member 421, which supports the side of the conductive part 32 facing the active material coating part 31.

[0114] As can be seen, the support member 421 can support the conductive part 32 and, to a certain extent, separate the conductive part 32 from the active material coating part 31. The support member 421 can also prevent the conductive part 32 from moving toward the active material coating part 31. For example, when the conductive part 32 is subjected to an external force that causes it to tend to move toward the active material coating part 31, the support member 421 can apply a reaction force to the conductive part 32 to prevent it from moving toward the active material coating part 31. This reduces the risk of the conductive part 32 moving toward the active material coating part 31 and causing a short circuit, which is beneficial to improving the reliability of the battery cell 100.

[0115] In the above technical solution, the support member 421 can support the conductive part 32, so that the conductive part 32 can maintain the preset shape, which is beneficial to make the shape and position of the conductive part 32 controllable. At the same time, the support member 421 can also block a part of the conductive part 32 from the active material coating part 31, so as to reduce the probability that the conductive part 32 will be inserted into the active material coating part 31 due to redundancy, thereby improving the reliability of the battery cell 100.

[0116] Please refer to Figures 12, 23, and 25. In some embodiments, the support member 421 supports the portion of the conductive part 32 that passes through the first perforation 411. For example, at least a portion of the support member 421 is located on the side of the first perforation 411 facing the active material coating part 31. Alternatively, the conductive part 32 includes a first segment 324 and a second segment 325, with the first segment 324 connected between the active material coating part 31 and the second segment 325, and the second segment 325 passing through the first perforation 411. The support member 421 supports the first segment 324.

[0117] Therefore, the specific position of the support member 421 supporting the conductive part 32 has a certain degree of flexibility, and the supporting arrangement of the support member 421 and the through arrangement of the conductive part 32 passing through the first through hole 411 are not likely to interfere with each other, which facilitates the convenient assembly of the battery cell 100.

[0118] It is understood that when the conductive part 32 includes a tab 322 but not the adapter 323, the tab 322 includes a first segment 324 and a second segment 325; when the conductive part 32 includes both the tab 322 and the adapter 323, the first segment 324 and the second segment 325 may both be part of the tab 322, or both the first segment 324 and the second segment 325 may both be part of the adapter 325, or the first segment 324 may be part of the tab 322 and the second segment 325 may be part of the adapter 323 (as shown in Figure 12), or the first segment 324 may be part of the tab 322 and the second segment 325 may include both part of the tab 322 and part of the adapter 323; but it is not limited to these.

[0119] Referring to Figures 6, 10, and 12, in some embodiments, the conductive portion 32 includes a bent section 321, which forms an opening groove 321a. Exemplarily, the bent section 321 may include a first extension section 3211, a second extension section 3212, and a transition section 3213. The first extension section 3211 and the second extension section 3212 may be disposed opposite to each other along the thickness direction of the first shell wall. The transition section 3213 is bent and connected between the first extension section 3211 and the second extension section 3212. One end of the first extension section 3211 away from the transition section 3213 and one end of the second extension section 3212 away from the transition section 3213 are spaced apart to define the opening of the groove 321a.

[0120] As shown in Figures 10 and 12, the opening of the slot 321a faces the side where the support member 421 is located. The support member 421 extends into the slot 321a and abuts against the bent section 321. This allows the support member 421 to provide certain support and / or pressure on the bent section 321, so that the bent section 321 can maintain a preset bending shape. This helps to control the bending shape of the conductive part 32 and the position of the bent section 321. At the same time, the support member 421 can also block a part of the bent section 321 from the active material coating part 31, so as to reduce the probability that the conductive part 32 will be inserted into the active material coating part 31 due to redundancy, reduce the risk of short circuit in the battery cell 100, and improve the reliability of the battery cell 100. For example, the bending section 321 includes a first extension section 3211, a second extension section 3212 and a transition section 3213. The first extension section 3211 is located on the side of the second extension section 3212 away from the active material coating portion 31. The support member 421 extends into the opening groove 321a so as to support the first extension section 3211 and / or press against the second extension section 3212.

[0121] In other examples, as shown in Figure 6, the opening of the slot 321a is positioned away from the side where the support member 421 is located. The support member 421 abuts against the side of the bent section 321 facing the active material coating part 31. In this way, the support member 421 can also provide some support for the bent section 321, making it easier for the bent section 321 to maintain the preset bending shape. This allows the bending shape of the conductive part 32 and the position of the bent section 321 to be controlled. At the same time, the support member 421 can also block the bent section 321 from the active material coating part 31, reducing the probability of the bent section 321 being inserted into the active material coating part and improving reliability. For example, the bending section 321 includes a first extension section 3211, a second extension section 3212, and a transition section 3213. The first extension section 3211 is located on the side of the second extension section 3212 that is away from the active material coating portion 31. The opening of the slot 321a is disposed away from the support member 421. The support member 421 abuts against the side of the second extension section 3212 and / or the transition section 3213 that faces the active material coating portion 31.

[0122] It is understood that in this embodiment, the support member 421 may extend horizontally, obliquely, or bend to match the bent segment 321. Furthermore, since there may be one or more bent segments 321, there may also be one or more opening slots 321a, and the support member 421 may correspond to one of the opening slots 321a.

[0123] Please refer to Figures 4, 6, 10, 12, and 13. In some embodiments, the support member 421 is cantilevered, and the fixed end of the support member 421 is connected to the wall of the first through hole 411. The free end of the support member 421 abuts against the bent section 321. It can be seen that while supporting the bent section 321, the support member 421 also has a certain deformation capacity, which allows the support member 421 to conform to the position and shape of the bent section 321, thereby improving the adaptability of the support member 421 to the bent section 321. At the same time, if the bent section 321 is located near the active material coating part 31, the support member 421 can press against the root of the active material coating part 31 near the bent section 321, so that the conductive part 32 can maintain the preset converged shape and not disperse.

[0124] In the above scheme, the free end of the support member 421 can extend into the opening groove 321a to abut against the bent section 321; or, the opening of the opening groove 321a is positioned away from the support member 421, and the free end of the support member 421 can abut against the side of the bent section 321 facing away from the inner wall of the opening groove 321a. Furthermore, in the above scheme, the support member 421 is conveniently integrally formed into the bracket body 41. Of course, the above-mentioned arrangement of the support member 421 can also be achieved by connecting the support member 421 to the bracket body 41 through assembly means.

[0125] For example, as shown in FIG10, the support member 421 is cantilevered, and the conductive parts 32 of all the battery cell assemblies 3 converge and connect. The free end of the support member 421 abuts against the conductive parts 32 of all the battery cell assemblies 3. At this time, the support member 421 can achieve a stop-fit ​​with the bent section 321 by extending into the opening groove 321a. In some other examples, as shown in FIG6, the support member 421 is cantilevered, and the conductive parts 32 of a portion of all the battery cell assemblies 3 converge and connect. The support member 421 abuts against the conductive parts 32 of the aforementioned portion of all the battery cell assemblies 3. At this time, the support member 421 can achieve a stop-fit ​​with the bent section 321 by facing away from the opening of the opening groove 321a.

[0126] Referring to Figure 12, in some embodiments, the support member 421 is located on the side of the support body facing the active material coating portion 31, and the two ends of the support member 421 in the width direction of the first shell wall 11 are respectively connected to the opening grooves 321a into which different conductive portions 32 extend. Similarly, it also facilitates the support member 421 to conform to the position and shape of the bent section 321, improving the adaptability of the support member 421 to the bent section 321. At the same time, the support member 421 can support multiple conductive portions 32, which facilitates the flexible arrangement of the internal structure of the battery cell 100.

[0127] Please refer to Figures 6, 10, and 12. In some embodiments, there are multiple battery cell assemblies 3, and the multiple battery cell assemblies 3 are arranged sequentially along the width direction of the first shell wall 11. The battery cell 100 is configured to satisfy any one of the following conditions A1 to A2:

[0128] Under condition A1, the conductive parts 32 of the same polarity of all cell components 3 converge and connect to form a first converged part 32a. The first converged part 32a has a bent section 321. At this time, the support member 421 can stop the conductive parts 32 of all cell components 3, which facilitates the convergence of the conductive parts 32 of all cell components 3 and helps to save the number of support members 421 and simplify the structure of the battery cell.

[0129] It is understandable that when the battery cell 100 meets condition A1, the support member 421 can also stop the bending section 321 in the following ways: Method 1, as shown in Figure 10, the opening of the slot 321a is set facing the side where the support member 421 is located, and the support member 421 extends into the opening slot 321a; Method 2, the opening of the slot 321a is set away from the side where the support member 421 is located, and the support member 421 stops the bending section 321 on the side facing the active material coating part 31.

[0130] Condition A2, the electrode assembly 2 corresponds to the middle position R2 of multiple cell assemblies 3 in the width direction of the first shell wall 11. The conductive parts 32 of the same polarity of the cell assemblies 3 located on the same side of the middle position R2 converge and connect to form a second convergence part 32b. The second convergence part 32b has a bent section 321, which facilitates the distributed arrangement of the conductive parts 32 of all cell assemblies 3. It can adapt to the case where the conductive parts 32 are thick, and makes it easier to free up some space for other components.

[0131] Optionally, when the battery cell 100 meets condition A2, the support member 421 can also stop the bending section 321 in the following ways: Method 1: As shown in Figure 6, the opening of the slot 321a is set away from the side where the support member 421 is located. The conductive parts 32 of the cell assembly 3 located on the first side converge and connect to form a second gathering part 32b. A part of the bending section 321 of the second gathering part 32b can extend to the second side, and the support member 421 located on the second side stops the bending section 321. Method 2: As shown in Figure 12, the opening of the slot 321a is set towards the side where the support member 421 is located. The conductive parts 32 of the cell assembly 3 located on the first side converge and connect to form a second gathering part 32b. The bending section 321 of the second gathering part 32b is located on the first side. The support member 421 extends into the slot 321a to stop the bending section 321.

[0132] Optionally, the middle position R2 is denoted as the first side and the second side on both sides of the width direction of the first shell wall 11, respectively: When the number of battery cell assemblies 3 is even, the middle position R2 can be located between two adjacent battery cell assemblies 3 in the middle. The conductive parts 32 of all battery cell assemblies 3 located on the first side converge and connect to form a second convergence part 32b, and the conductive parts 32 of all battery cell assemblies 3 located on the second side converge and connect to form a second convergence part 32b; When the number of battery cell assemblies 3 is odd, the middle position R2 can be located in the middle of the middle battery cell assembly 3. In this case, the conductive parts 32 of the middle battery cell assembly 3 can converge and connect to the conductive parts 32 of the battery cell assembly 3 located on the first side, or the conductive parts 32 of the middle battery cell assembly 3 can converge and connect to the conductive parts 32 of the battery cell assembly 3 located on the second side, or a portion of the conductive parts 32 of the middle battery cell assembly 3 can converge and connect to the first side and another portion can converge and connect to the second side.

[0133] Referring to Figure 6, in some embodiments, the battery cell 100 satisfies condition A2. The middle position R2 has a first side and a second side on both sides of the width direction of the first shell wall 11, respectively. There are multiple support members 421, and the multiple support members 421 include first support members and second support members spaced apart in the length direction of the first shell wall 11 (the support member 421 shown in Figure 6 can be understood as a first support member or a second support member). The first support member and the second support member respectively abut against the conductive part 32 of the same polarity of different cell assemblies 3. The first support member is located on the first side, and the second support member is located on the second side. Among them, a part of the bent section 321 corresponding to the cell assembly 3 located on the first side extends to the second side of the middle position. The second support member abuts against the side of the bent section 321 corresponding to the cell assembly 3 located on the first side facing the active material coating part 31. A part of the bent section 321 corresponding to the cell assembly 3 located on the second side extends to the first side of the middle position R2. The first support member abuts against the side of the bent section 321 corresponding to the cell assembly 3 located on the second side facing the active material coating part 31. Obviously, the first support member can be set opposite to the opening of the corresponding opening slot 321a, and the second support member can be set opposite to the opening of the corresponding opening slot 321a.

[0134] For example, taking two battery cell assemblies 3 and the width direction of the first shell wall 11 as the left-right direction, the first support member is located on the left side and the second support member is located on the right side. A portion of the bent section 321 of the left battery cell assembly 3 extends to the right side of the middle position R2. The second support member abuts against the side of the bent section 321 of the left battery cell assembly 3 facing the active material coating portion 31, and the first support member abuts against the side of the bent section 321 of the right battery cell assembly 3 facing the active material coating portion 31.

[0135] In the above technical solution, by setting a first support member and a second support member that are opposite to each other in the width direction and staggered in the length direction of the first shell wall 11, the first support member abuts the conductive part 32 of the cell assembly 3 located on one side of the middle position R2, and the second support member abuts the conductive part 32 of the cell assembly 3 located on the other side of the middle position R2, so that the support member 421 can support and / or press against the conductive part 32, and the arrangement of the support member 421 can adapt to the arrangement requirements of the conductive part 32 of the cell assembly 3, so that the arrangement of the support member 421 matches the arrangement of the conductive part 32. In addition, the setting of the first support member and the second support member can also realize the arrangement of all the conductive parts 32 of the cell assembly 3 directly converging towards the middle position R2, which is beneficial to appropriately shorten the length of the conductive part 32, save the space occupied by the conductive part 32, reduce the redundancy of the conductive part 32, and facilitate the connection of the conductive part 32 with the terminal assembly 2.

[0136] Please refer to Figure 12. In some embodiments, the battery cell 100 satisfies condition A2. The middle position R2 is on the first side and the second side on both sides of the first shell wall width direction. The two ends of the support member 421 in the first shell wall width direction respectively abut against the conductive part 32 of the same polarity of different cell assemblies. One end of the support member 421 extends into the opening groove 321a of the bent section 321 on the first side, and the other end of the support member 421 extends into the opening groove 321a of the bent section 321 on the second side.

[0137] For example, taking two battery cell assemblies 3 and the width direction of the first shell wall 11 as the left-right direction, the bent section 321 of the left battery cell assembly 3 is located to the left of the middle position R2. The left end of the support member 421 extends into the opening groove 321a of the left bent section 321, and the right end of the support member 421 extends into the opening groove 321a of the right bent section 321. The left bent section 321 is formed on the second gathering portion 32b of the left battery cell assembly 3, and the right bent section 321 is formed on the second gathering portion 32b of the right battery cell assembly.

[0138] In the above technical solution, by setting the support member 421 to extend into different opening slots 321a at both ends in the width direction of the first shell wall, so as to stop the conductive part 32 of different cell assembly 3, it is convenient for the support member 421 to stop the conductive part 32 of all cell assembly 3, which facilitates the dispersed arrangement of the conductive part 32 of all cell assembly 3, and helps to save the number of support members 421 and simplify the structure of the battery cell 100.

[0139] Please refer to Figure 12. In some embodiments, the support member 421 extends from both ends of the first shell wall 11 toward the end of the support body 41 to the end adjacent to the end of the support body 41. The two ends of the support member 421 and the end of the support body 41 respectively define a second through hole 40 for the conductive part 42 to pass through.

[0140] In the above technical solution, the conductive part 32 passes through the second through hole 40. The end of the support member 421 and the end of the bracket body 41 can press and gather the conductive part 32 respectively, restricting the conductive part 32 and making it easier for the conductive part 32 to maintain the preset gathered shape. Moreover, since the second through hole 40 is located at the end of the bracket body 41, the second through hole 40 is relatively close to the root of the bent section 321 and the active material coating part 41, which helps to make the bent section 321 and the root of the active material coating part 41 more compact, and further reduces the probability of the bent section 321 spreading out.

[0141] Please refer to Figures 12 and 20-27. In some embodiments, the support member 421 includes a first plate portion 4211 and two second plate portions 4212. The two second plate portions 4212 are respectively disposed at both ends of the first plate portion 4211. Each second plate portion 4212 defines a second through hole 40 with the support body 41. The two second plate portions 4212 extend obliquely toward the support body 41 in a direction away from each other. Thus, each second plate portion 4212 extends obliquely toward the support body 41 in a direction away from the other second plate portion 4212, so that the distance between the second plate portion 4212 and the active material coating portion 32 increases in the direction away from the middle position in the width direction of the first shell wall 11.

[0142] Since the multiple tabs of the conductive part 32 are close to each other near the root of the active material coating part 31 to form a structure with a certain slope, in the above solution, the two second plates 4212 are inclined and extend towards the support body 41 in a direction away from each other, so that the distance between the second plates 4212 and the active material coating part 31 can adapt to the space required by the second gathering parts 32b on both sides, so that the second plates 4212 can give way to the root of the second gathering part 32b to a certain extent, while also taking into account the pressure and restriction of the root position of the second gathering part 32b by the second plates 4212.

[0143] Please refer to Figure 10. In some embodiments, the insulating support 4 further includes a pressing member 422 that is opposite to and spaced apart from the support member 421. The conductive part 32 passes through the gap between the support member 421 and the pressing member 422, and the pressing member 422 presses against the side of the conductive part 32 facing the active material coating part 31.

[0144] As can be seen, by setting the pressing member 422, the conductive part 32 is sandwiched between the support member 421 and the pressing member 422. The pressing member 422 and the support member 421 cooperate to gather the conductive part 32, which makes it easier to maintain the conductive part 32 in the preset gathered and extended shape, and the conductive part 32 is more tightly gathered, further reducing the probability of the conductive part 32 spreading out. In particular, the conductive part 32 includes a tab 322, which includes multiple stacked tab pieces. The tab 322 passes between the support member 421 and the pressing member 422, which makes it easier to maintain the shape of the tab 322 and reduce the probability of the tab 322 spreading out.

[0145] Please refer to Figure 10. In some embodiments, the conductive part 32 includes a bent section 321. The bent section 321 has an opening groove 321a. A support member 421 corresponding to the pressing member 422 extends into the opening groove 321a. The support member 421 corresponding to the pressing member 422 abuts against the bent section 321. The pressing member 422 abuts against the side of the bent section 321 away from the active material coating part 31.

[0146] In the above technical solution, the pressing member 422 cooperates with the support member 421. The support member 421 extends into the opening groove 321a, and the pressing member 422 abuts against the side of the bent section 321 away from the active material coating part 31, so that a part of the bent section 321 is restricted between the support member 421 and the pressing member 422. The pressing member 422 and the support member 421 cooperate to bring the bent section 321 together, so that the bent section 321 can maintain the preset convergence and bending shape, and the bent section 321 is brought together more tightly, further reducing the probability of the bent section 321 spreading out. It can be understood that in the embodiments of this application, the pressing member 422 can extend horizontally, extend obliquely, or extend in a bent manner, so as to match the bent section 321.

[0147] Referring to Figures 6, 10, and 13, in some embodiments, the bracket body 41 and the support member 421 are integrated, which saves assembly steps and improves the assembly efficiency of the battery cell 100, while also facilitating a reliable connection between the bracket body 41 and the support member 421. Alternatively, referring to Figures 12 and 23-27, in some embodiments, the bracket body 41 and the support member 421 are separate components, fixed by heat fusion, snap-fit, or adhesive bonding, which improves the flexibility of their structural design. For example, a buckle 4210 is formed on the support member 421, and a locking hole is formed on the bracket body 41, with the buckle 4210 fastened to the locking hole.

[0148] It is understood that in any embodiment of this application, the conductive part 32 may take any of the following forms: Form 1, the conductive part 32 includes a tab and an adapter, the tab is connected to the end of the active material coating part 31 facing the first shell wall 11, and the tab includes a plurality of stacked tab pieces, the adapter is connected between the tab and the electrode body 21, if the conductive part 32 forms a bent section 321, the bent section 321 may be defined by the tab and / or the adapter; Form 2, the conductive part 32 includes a tab but does not include an adapter, the tab is connected to the end of the active material coating part 31 facing the first shell wall 11 and the electrode body 21, if the conductive part 32 forms a bent section 321, the bent section 321 may be defined by the tab.

[0149] In some embodiments, the bracket body 41 and the pressing member 422 are integral or separate parts; when the bracket body 41 and the pressing member 422 are separate parts, they are fixed by heat fusion, snap-fit ​​or adhesive bonding.

[0150] In some embodiments, as shown in FIG8, the clamping structure 22 is integrally formed on the first shell wall 11; or, as shown in FIG6, FIG10 and FIG12, the clamping structure 22 is welded and fixed to the first shell wall 11. Thus, the connection method between the clamping structure 22 and the first shell wall 11 is flexible and can easily meet different actual needs.

[0151] It is understood that, in any embodiment of this application, the clamping engagement between the clamping structure 22 and the pole body 21 may include, but is not limited to: a clamping groove being formed on the inner periphery of the clamping structure 22, and an outward protrusion being formed on the outer periphery of the pole body 21, the outward protrusion engaging with the clamping groove; or a clamping protrusion being formed on the inner periphery of the clamping structure 22, and a clamping groove being formed on the outer periphery of the pole body 21, the clamping protrusion engaging with the clamping groove.

[0152] Please refer to Figures 4, 6, 10, and 13. In some embodiments, the support body 41 also has a partition 412. The partition 412 is arranged around the first through hole 411, and the partition 412 is formed into a ring structure. The clamping structure 22 is welded and fixed to the first shell wall 11, and the welding position R1 of the clamping structure 22 and the first shell wall 11 is opposite to the partition 412 along the thickness direction of the first shell wall 11, so that the partition 411 separates the above-mentioned welding position R1 of the clamping structure 22 from the active material coating part 31. During the assembly or use of the battery cell 100, the partition 412 can receive the welding slag at the welding position R1 to prevent the welding slag from falling onto the active material coating part 31, reduce the possibility of welding slag piercing the active material coating part 31, reduce the possibility of welding slag piercing the electrode sheet and separator, and improve the reliability of the battery cell 100.

[0153] It is understood that the welding position R1 between the pole assembly 2 and the first shell wall 11 can be located on the clamping structure 22 and on the outer periphery of the pole body 21, rather than on the pole body 21. This facilitates the distributed arrangement of the pole body 21 and other components, and allows the pole body 21 to provide a suitable position and size area for electrical connection with the conductive part 32. This helps to reduce the impact on the electrical connection between the pole body 21 and the conductive part 32, and also helps to improve the connection reliability between the pole body 21 and the conductive part 32.

[0154] As can be seen, a portion of the bracket body 41 can physically isolate the welding position R1 of the clamping structure 22 from the active material coating part 31. Therefore, the battery cell 100 does not need to be provided with other components to separate the welding position R1 from the active material coating part 31, which simplifies the structure of the battery cell 100.

[0155] In the above technical solution, by providing a partition 412 on the support body 41 located between the first shell wall 11 and the active material coating part 31, the partition 412 is arranged around the first through hole 411 for the conductive part 32 to pass through, and the welding position R1 of the electrode assembly 2 and the first shell wall 11 is opposite to the partition 412, so that the partition 412 separates the welding position R1 from the active material coating part 31, the partition 412 can receive the welding slag at the welding position R1 during the assembly or use of the battery cell 100, so as to prevent the welding slag from falling onto the active material coating part 31, reducing the possibility of the welding slag piercing the active material coating part 31, reducing the possibility of the welding slag piercing the electrode sheet and the separator, and improving the reliability of the battery cell 100.

[0156] It is understood that, in this embodiment of the application, regardless of the structure of the separator 412, during the assembly of the battery cell 100, the welding slag generated during the welding of the clamping structure 22 and the first shell wall 11 is at a high temperature. Therefore, when the welding slag falls onto the separator 412, it can be embedded in the separator 412 under the action of gravity and temperature. In subsequent use, the welding slag embedded in the separator 412 is not easy to detach and does not easily affect the normal use of the battery cell 100. For example, the bracket body 41 is a plastic part.

[0157] Please refer to Figures 4, 6, 10 and 13. In some embodiments, the partition 412 has an annular groove 412a, which is open on the side facing the welding position R1.

[0158] In the above scheme, by opening the groove 412a on the separator 412 towards the welding position R1, welding slag can fall from the open side of the groove 412a into the groove 412a. The groove wall of the groove 412a can limit and guide the welding slag falling into it. At the same time, the setting of the groove 412a helps to improve the welding slag collection capacity of the separator 412, which helps to further reduce the probability of welding slag falling into the active material coating part 31, thereby improving the reliability of the battery cell 100. Of course, the structure of the separator 412 is not limited to this. In other embodiments of this application, the separator 412 can also be constructed as a flat plate structure, which makes the structure of the separator 412 simple and easy to process.

[0159] Please refer to Figures 4, 6, 10 and 13. In some embodiments, the partition 412 includes a first part 4121 and a second part 4122. The first part 4121 is opposite to the welding position R1 along the thickness direction of the first shell wall 11. The second part 4122 is bent and connected to one end of the first part 4121 away from the central axis L of the first perforation 411, and the second part 4122 extends toward the welding position R1.

[0160] As can be seen, in the longitudinal section of the partition 412, the first part 4121 and the second part 4122 are approximately L-shaped. The first part 4121 and the second part 4122 have grooves 412a, and the radially inner side of the grooves 412a is also open. The longitudinal section of the partition 412 passes through the central axis of the first through hole 411. For example, taking the first shell wall 11 as the top wall of the shell assembly 1 and the thickness direction of the first shell wall 11 as the vertical direction, the first part 4121 is arranged around the first through hole 411, and the first part 4121 is spaced below the welding position R1 between the clamping structure 22 and the first shell wall 11. The second part 4122 is connected around the outer periphery of the first part 4121, and the second part 4122 extends upward from the outer periphery of the first part 4121.

[0161] In the above technical solution, by setting the partition 412 including a first part 4121 and a second part 4122, the first part 4121 is connected to the end of the second part 4122 away from the welding position R1, which facilitates the processing of the partition 412 and the forming of the groove 412a.

[0162] Please refer to Figures 4 and 13. In some embodiments, a liquid injection hole 113 is formed on the first shell wall 11, and a liquid injection channel 413 is formed on the support body 41. The liquid injection channel 413 penetrates the side surface of the support body 41 facing the first shell wall 11 to form a liquid inlet 413a. The liquid inlet 413a is opposite to the liquid injection hole 113. The side of the liquid injection channel 413 facing the active material coating part 31 is at least partially closed. A liquid outlet 413b is formed on the peripheral wall of the liquid injection channel 413, and / or a liquid outlet 413b is formed on the side wall of the liquid injection channel 413 facing the active material coating part 31. The liquid outlet 413b communicates with the space between the support body 41 and the active material coating part 31.

[0163] The active material coating part 31 is a key component of the battery cell assembly 3. The active material coating part 31 contains active materials that participate in the battery chemical reaction. These active materials usually exist on the battery cell assembly 3 in the form of a coating. The coating plays a decisive role in the capacity, cycle life and performance of the battery cell 100. The liquid injection channel 413 is connected to the liquid injection hole 113 through the liquid inlet 413a, and the liquid injection channel 413 is connected to the space where the active material coating part 31 is located through the liquid outlet 413b. Thus, the liquid injection channel 413 connects the two sides of the support body 41 in the thickness direction of the first shell wall 11. The liquid injection tool can be fitted at the liquid injection hole 113 so that electrolyte can be injected into the receiving cavity 10 through the liquid injection channel 413. Because the side of the injection channel 413 facing the active material coating part 31 is at least partially closed, the electrolyte flows into the side of the battery cell 100 support body 41 facing the active material coating part 31 in a gentler manner after passing through the injection channel 413. During the injection process, the electrolyte first contacts the bottom wall of the side of the injection channel 413 facing the active material coating part 31, and then flows through the bottom wall to the outlet 413b to reach the side of the support body 41 facing the active material coating part 31 to complete the injection. The bottom wall of the injection channel 413 can effectively slow down the flow rate and impact force of the electrolyte, so that the electrolyte will not directly impact the active material coating part 31, thereby affecting the integrity of the coating of the active material coating part 31, and improving the service life and reliability of the battery cell 100.

[0164] It is understandable that if the side of the injection channel 413 facing the active material coating part 31 is partially closed, the unclosed part of the side of the injection channel 413 facing the active material coating part 31 forms an outlet 413b. At this time, an outlet 413b is formed on the side wall of the injection channel 413 facing the active material coating part 31. It is optional whether an outlet 413b is formed on the peripheral wall of the injection channel 413. However, if the side of the injection channel 413 facing the active material coating part 31 is completely closed, the outlet 413b is formed on the peripheral wall of the injection channel 413.

[0165] In the above technical solution, by providing an injection hole 113 on the first shell wall 11 and an injection channel 413 on the support body 41, electrolyte can be injected into the receiving cavity 10 through the injection hole 113 and the injection channel 413. Of course, if the sealing structure at the injection hole 113 is configured to allow the injection hole 113 to be opened, the electrolyte in the receiving cavity 10 can also be discharged through the injection hole 113 and the injection channel 413. Moreover, since the side of the injection channel 413 facing the active material coating part 31 is at least partially closed, the closed part of the injection channel 413 facing the active material coating part 31 can play a certain blocking role on the electrolyte during the injection process, so that the electrolyte does not directly impact the active material coating part 31, which is beneficial to improving the reliability of the battery cell 100.

[0166] Optionally, the injection channel 413 has a peripheral wall and a bottom wall, at least a portion of the peripheral wall and the bottom wall being located on the side of the support body 41 facing the active material coating part 31. The outlet 413b can be formed on the peripheral wall and / or bottom wall of the injection channel 413. For example, the outlet 413b is formed on the bottom wall of the injection channel 413, and there are two outlets 413b, which are spaced apart and separated by the bottom wall of the injection channel 413. When the operator performs the injection operation, the bottom wall can block the impact of the injected electrolyte on the active material coating part 31, and reduce the flow rate and impact force of the electrolyte, thereby making the active material coating part 31 more protected.

[0167] Please refer to Figure 13. In some embodiments, the support body 41 further includes a support portion 414 and a connecting portion 415. In the thickness direction of the first shell wall 11, the thickness t2 of the support portion 414 is greater than the thickness t1 of the connecting portion 415, so that the support portion 414 protrudes from the connecting portion 415 toward the active material coating portion 31. There are n support portions 414, and the multiple support portions 414 are spaced apart along the length direction of the first shell wall 11, where n≥3 and n is a positive integer. A connecting portion 415 connects two adjacent support portions 414. The support portion 414 abuts between the first shell wall 11 and the active material coating portion 31. A first perforation 411 is formed on the connecting portion 415.

[0168] As can be seen, the support portion 414 can be supported between the first shell wall 11 and the active material coating portion 31 to reliably separate the first shell wall 11 from the active material coating portion 31, thereby improving the insulation performance between the first shell wall 11 and the active material coating portion 31. At the same time, the support portion 414 can provide a certain degree of support for the active material coating portion 31, which is beneficial to improving the stability and reliability of the battery cell assembly 3 and reducing the risk of shaking or displacement of the battery cell assembly 3. In addition, the number of support portions 414 is greater than or equal to three, which can realize the multi-segment support setting of the bracket body 41, forming multiple support points between the first shell wall 11 and the active material coating portion 31, so as to distribute and bear the active material coating portion 31 during charging and discharging. The stress generated by deformation helps to reduce the deformation of the first shell wall 11 and maintain the overall shape of the battery cell 100, thereby enhancing the structural and dimensional stability of the battery cell 100 and reducing the risk of damage to the cell assembly 3. The support portion 414 protrudes from the connection portion 415 toward the active material coating portion 31, so that the connection portion 415 can be spaced apart from the active material coating portion 31. The first perforation 411 and the partition portion 412 are both formed on the connection portion 415, so the support point between the first shell wall 11 and the active material coating portion 31 can be avoided from the conductive portion 32, and the space between the connection portion 415 and the active material coating portion 31 can provide a certain space for the conductive portion 32.

[0169] In the above technical solution, by setting three or more support portions 414, and the support portions 414 protruding from the connecting portion 415 towards the active material coating portion 31, the bracket body 41 can form multiple support points between the first shell wall 11 and the active material coating portion 31, thereby improving the insulation between the first shell wall 11 and the active material coating portion 31, and facilitating the enhancement of the structural and dimensional stability of the battery cell 100, reducing the risk of damage to the cell assembly 3, and providing clearance for the setting of the conductive portion 32; in addition, it facilitates the provision of a suitable stop area between the bracket body 41 and the cell assembly 3, which is not too large and may easily affect the smoothness of venting during thermal runaway of the cell assembly 3, and is not too small and may easily damage the cell assembly 3, thus improving the reliability of the battery cell 100.

[0170] It is understandable that when the support body 41 also has a partition 412, the partition 412 can be formed on the connecting part 415.

[0171] Referring to Figure 13, in some embodiments, the plurality of support portions 414 include a first support portion 4141, a second support portion 4142, and a third support portion 4143. The first support portion 4141 and the second support portion 4142 are respectively located at both ends of the length of the support body 41, and the third support portion 4143 is spaced between the first support portion 4141 and the second support portion 4142. In this embodiment, the length direction of the support body 41 is the same as the length direction of the first shell wall 11, the thickness direction of the support body 41 is the same as the thickness direction of the first shell wall 11, and the width direction of the support body 41 is the same as the width direction of the first shell wall 11.

[0172] In the above technical solution, by setting the first support part 4141 and the second support part 4142 at the two ends of the length direction of the bracket body 41 respectively, and the third support part 4143 spaced between the first support part 4141 and the second support part 4142, the bracket body 41 can support the battery cell assembly 3 at both ends and the middle position in the length direction, and has a large support range, which is beneficial to improving the setting stability of the bracket body 41 and achieving stable support for the battery cell assembly 3.

[0173] Please refer to Figures 13-16. In some embodiments, at least one support portion 414 is formed with a weight-reducing structure 4144, and the number of support portions 414 with the weight-reducing structure 4144 is less than or equal to the total number of all support portions 414.

[0174] In the above technical solution, by setting a weight reduction structure 4144 on at least one support part 414, it is beneficial to save the amount of material used in the support body 41, reduce the weight of the support body 41, and at the same time, it is beneficial to save the volume of the support body 41, reduce the occupation of the insulating support 4 on the receiving cavity 10, thereby reducing the weight of the battery cell 100 and increasing the energy density of the battery cell 100.

[0175] In this embodiment of the application, there is no limitation on the specific structural form of the weight-reducing structure 4144. The weight-reducing structure 4144 may include at least one structural form such as a groove or a hole. It is understood that when at least two of the plurality of support parts 414 are respectively formed with weight-reducing structures 4144, the structural forms of the weight-reducing structures 4144 on different support parts 414 may be the same or different.

[0176] For example, as shown in Figures 13-16, a plurality of support portions 414 include a first support portion 4141, a second support portion 4142, and a third support portion 4143. The first support portion 4141 and the second support portion 4142 are respectively located at both ends of the length of the support body 41, and the third support portion 4143 is spaced between the first support portion 4141 and the second support portion 4142. Weight-reducing structures 4144 are formed on the first support portion 4141, the second support portion 4142, and the third support portion 4143, respectively. Optionally, the weight-reducing structure 4144 on the first support portion 4141 has the same structural form as the weight-reducing structure 4144 on the second support portion 4142, both of which include the discharge channel 4144a and the weight-reducing hole 4144b described later; the weight-reducing structure 4144 on the third support portion 4143 includes the discharge channel 4144a but does not include the weight-reducing hole 4144b.

[0177] Please refer to Figures 13-16. In some embodiments, the weight reduction structure 4144 includes a discharge channel 4144a. The discharge channel 4144a extends along the length of the first shell wall 11 to the opposite sides of the portion of the corresponding support 414 that protrudes from the connecting portion 415. Thus, along the length of the first shell wall 11, the discharge channel 4144a can connect the opposite sides of the support 414. Therefore, when the battery cell 100 experiences thermal runaway, the emissions generated inside the battery cell 100 can flow from one side of the support 414 to the other side through the discharge channel 4144a toward the battery cell 100. The flow of the pressure relief valve at 0 facilitates the improvement of the pressure relief smoothness and reliability of the battery cell 100; and / or, the weight reduction structure 4144 includes a weight reduction hole 4144b, which is closed at both ends of the first shell wall 11 in the length direction. Then, the portion of the support portion 414 that defines the hole wall at both ends of the weight reduction hole 4144b in the length direction of the first shell wall 11 can abut against the first shell wall 11 and the active material coating portion 31, so that the setting of the weight reduction hole 4144b does not easily weaken the support effect of the support portion 414, and realizes the reliable support of the support portion 414 for the active material coating portion 31.

[0178] In the above technical solution, by setting the weight reduction structure 4144 including the discharge channel 4144a, the discharge channel 4144a can achieve both the lightweight design of the insulating support 4 and the smooth pressure release of the battery cell 100, serving multiple purposes. By setting the weight reduction structure 4144 including the weight reduction hole 4144b, the weight reduction hole 4144b can achieve the lightweight design of the insulating support 4 without significantly affecting the support effect of the support part 414. In addition, the setting of the discharge channel 4144a can appropriately increase the width of the support part 414 to a certain extent. For example, the width of the support part 414 can be equal to the width of the connecting part 415, so that the support part 414 can support the entire cell assembly 3 in the width direction.

[0179] It is understood that the discharge channel 4144a can extend in a straight line or in a curve along the length of the first shell wall 11. For example, as shown in FIG14, the discharge channel 4144a extends along the length of the first shell wall 11 to the opposite sides of the portion of the corresponding support portion 414 that protrudes from the connecting portion 415, so that the two ends of the discharge channel 4144a are respectively formed as a first connecting port and a second connecting port, and the first connecting port and the second connecting port are respectively formed on both sides of the support portion 414 along the length of the first shell wall 11.

[0180] It is understandable that when the weight reduction structure 4144 includes the discharge channel 4144a and the weight reduction hole 4144b, it can achieve the lightweight design of the insulating support 4, while also ensuring the smooth pressure relief of the battery cell 100 and the support effect of the support part 414 on the first shell wall 11 and the active material coating part 31.

[0181] Please refer to Figures 13-16. In some embodiments, the weight reduction structure 4144 includes a discharge channel 4144a and a weight reduction hole 4144b. At least one of the discharge channel 4144a and the weight reduction hole 4144b can be multiple. The discharge channel 4144a and the weight reduction hole 4144b are alternately arranged in the width direction of the first shell wall 11.

[0182] For example, there are two discharge channels 4144a and one weight-reducing hole 4144b. In the width direction of the first shell wall 11, the weight-reducing hole 4144b is disposed between the two discharge channels 4144a; or, there are two weight-reducing holes 4144b and one discharge channel 4144a. In the width direction of the first shell wall 11, the discharge channel 4144a is disposed between the two weight-reducing holes 4144b; or, there are multiple discharge channels 4144a and multiple weight-reducing holes 4144b. In the width direction of the first shell wall 11, there is one weight-reducing hole 4144b between two adjacent discharge channels 4144a and one discharge channel 4144a between two adjacent weight-reducing holes 4144b.

[0183] It is understood that the discharge channel 4144a extends along the length of the first shell wall 11 to the opposite sides of the portion protruding from the connecting portion 415 through the corresponding support portion 414. Therefore, the support portion 414 that defines the discharge channel 4144a at both ends of the first shell wall 11, for example, the portion of the support portion 414 that defines the first and second connecting ports mentioned above, has relatively weak support strength. On the other hand, the weight reduction hole 4144b is closed at both ends of the first shell wall 11. Therefore, the support portion 414 that defines the weight reduction hole 4144b at both ends of the hole wall in the length of the first shell wall 11 has relatively strong support strength.

[0184] In the above technical solution, by setting the discharge channel 4144a and the weight reduction hole 4144b alternately in the width direction of the first shell wall 11, it is easy to make the support strength of the support part 414 at both ends in the length direction of the first shell wall 11 evenly distributed in the width direction of the first shell wall 11. This is beneficial to improving the overall support strength of the support part 414 at both ends in the length direction of the first shell wall 11, so that the support part 414 can simultaneously meet the requirements of weight reduction and pressure relief discharge while reliably supporting the battery cell assembly 3.

[0185] Referring to Figures 13 and 14, in some embodiments, the weight-reducing structure 4144 includes a discharge channel 4144a and a weight-reducing hole 4144b. Both the discharge channel 4144a and the weight-reducing hole 4144b are open on the side facing away from the active material coating portion 31, and both are closed on the side facing the active material coating portion 31. For example, the discharge channel 4144a and the weight-reducing hole 4144b can be formed by a recess in a portion of the surface of the support body 41 facing the first shell wall 11 towards the active material coating portion 31.

[0186] In the above technical solution, the sides of the discharge channel 4144a and the weight-reducing hole 4144b that are away from the active material coating part 31 are both open, while the sides of both that face the active material coating part 31 are closed. This facilitates the processing of the discharge channel 4144a and the weight-reducing hole 4144b. Furthermore, it allows for the concentrated arrangement of the portion of the support body 41 that defines the closed side of the weight-reducing structure on the same side of the weight-reducing structure in the thickness direction of the first shell wall 11. For example, when the support body 41 is an integrally molded part, such as when the support body 41 is injection molded, the mold defining the discharge channel 4144a and the weight-reducing hole 4144b is at least partially located on the same side of the cavity, facilitating mold assembly and arrangement. It also facilitates the disassembly of the mold on the same side after molding, improving operational convenience. Alternatively, if the weight-reducing structure 4144 is formed by machining, the machining tool can process the discharge channel 4144a and the weight-reducing hole 4144b on the same side without needing to flip the workpiece, thus improving processing efficiency.

[0187] Please refer to Figures 13-17. In some embodiments, the support portion 414 is flush with the portion of the discharge channel 4144a and the weight reduction hole 4144b facing the active material coating portion 31. In this case, the portion of the support portion 414 that defines the closed side of the discharge channel 4144a facing the active material coating portion 31 is flush with the portion of the support portion 414 that defines the closed side of the weight reduction hole 4144b facing the active material coating portion 31.

[0188] Specifically, the support portion 414 may include a first portion 4121 and a second portion 4122. The first portion 4121 closes the side of the exhaust channel facing the active material coating portion 31, and the second portion 4122 closes the side of the weight reduction hole 4144b facing the active material coating portion 31. The surface of the first portion 4121 facing the active material coating portion 31 and the surface of the second portion 4122 facing the active material coating portion 31 are located on the same plane.

[0189] In the above technical solution, by setting the support part 414 to be flush with the side of the discharge channel 4144a and the weight reduction hole 4144b facing the active material coating part 31, the support part 414 can provide a large and flat surface on the side facing the active material coating part 31. The support part 414 is less likely to be affected by the setting of the discharge channel 4144a and the weight reduction hole 4144b, which is beneficial to improving the supporting effect of the support part 414 on the battery cell assembly 3.

[0190] Please refer to Figures 13-16. In some embodiments, a connecting hole 4145 is formed on the weight reduction structure 4144. The connecting hole 4145 connects the support portion 414 on opposite sides in the thickness direction of the first shell wall 11. The connecting hole 4145 penetrates the support portion 414 along the thickness direction of the first shell wall 11. Electrolyte on opposite sides of the support portion 414 can flow through the connecting hole 4145 in the thickness direction of the first shell wall 11. Electrolyte on the side of the support portion 414 away from the active material coating portion 31 can flow through the connecting hole 4145 to the side where the active material coating portion 31 is located, so as to wet the active material coating portion 31. This allows the electrolyte on the side of the support portion 414 away from the active material coating portion 31 to be fully utilized, which is beneficial to improving the cycle performance of the cell assembly 3 and improving the reliability of the battery cell 100.

[0191] The weight-reducing structure 4144 includes a discharge channel 4144a, which is closed on one side of the first shell wall 11 in the thickness direction. A connecting hole 4145 is formed on the closed side of the first shell wall 11 in the thickness direction. The discharge channel 4144a can be formed by a recess in a part of the surface of one side of the support body 41, which facilitates the processing and forming of the discharge channel 4144a and the connecting hole 4145. And / or, the weight-reducing structure 4144 includes a weight-reducing hole 4144b, which is closed on one side of the first shell wall 11 in the thickness direction. A connecting hole 4144b is formed on the closed side of the first shell wall 11 in the thickness direction. The weight-reducing hole 4144b can be formed as a blind hole or can be formed by a recess in a part of the surface of one side of the support, which facilitates the processing and forming of the weight-reducing hole 4144b and the connecting hole 4145.

[0192] In the above technical solution, by providing a connecting hole 4145, the electrolyte on the side of the support portion 414 away from the active material coating portion 31 can flow through the connecting hole 4145 to the side where the active material coating portion 31 is located, so as to wet the active material coating portion 31 and make full use of the electrolyte in the receiving cavity 10; at the same time, since the connecting hole 4145 is formed on the weight reduction structure 4144, it is possible to make full use of the space provided by the support portion 414, which is beneficial to save the space occupied by the support portion 414. Combined with the arrangement of the weight reduction structure 4144 being closed on one side in the thickness direction of the first shell wall 11 and the connecting hole 4145 being formed on the closed side, it is convenient to process and form the weight reduction structure 4144 and the connecting hole 4145.

[0193] It is understandable that, for the discharge channel 4144a, the discharge channel 4144a is closed on one side in the thickness direction of the first shell wall 11, which can include: Option 1, the discharge channel 4144a is closed on the side of the first shell wall 11 in the thickness direction of the first shell wall 11, and the discharge channel 4144a is open on the side of the first shell wall 11 away from the first shell wall 11 in the thickness direction of the first shell wall 11. In this case, the discharge channel 4144a can be formed by a portion of the surface of the support body 41 on the side away from the first shell wall 11 recessed towards the first shell wall 11. If the discharge channel 4144a has a connecting hole 4145, then the connection... Hole 4145 penetrates the aforementioned closed side of discharge channel 4144a; Alternative scheme, as shown in Figure 14, discharge channel 4144a is closed on the side facing away from the first shell wall 11 in the direction of the first shell wall 11, and open on the side facing the first shell wall 11 in the thickness direction of the first shell wall 11. In this case, discharge channel 4144a can be formed by a portion of the surface of the support body 41 facing the first shell wall 11 recessed towards the active material coating part 31. If discharge channel 4144a has a connecting hole 4145, the connecting hole 4145 penetrates the aforementioned closed side of discharge channel 4144a. Therefore, regardless of the structural form of discharge channel 4144a, the connecting hole 4145 communicates with discharge channel 4144a, and the electrolyte on opposite sides of the support part 414 in the thickness direction of the first shell wall 11 can flow through discharge channel 4144a and connecting hole 4145.

[0194] Similarly, the arrangement of the weight-reducing hole 4144b is similar to that of the connecting hole 4145 and the discharge channel 4144a, and will not be described again here. Of course, in other embodiments of this application, the connecting hole 4145 on the support 414 can also be formed at other locations on the support 414, for example, the connecting hole 4145 may be spaced apart from the weight-reducing structure 4144, and is not limited to being provided on the weight-reducing structure 4144.

[0195] Please refer to Figures 13-16. In some embodiments, the plurality of support portions 414 include a first support portion 4141, a second support portion 4142, and a third support portion 4143. The first support portion 4141 and the second support portion 4142 are respectively located at both ends of the length of the support body 41, and the third support portion 4143 is spaced between the first support portion 4141 and the second support portion 4142. A pressure relief structure 5 is provided on the first shell wall 11, and the third support portion 4143 is opposite to the pressure relief structure 5. A discharge channel 4144a and a connecting hole 4145 are formed on the third support portion 4143. Since the connecting hole 4145 penetrates the closed side of the discharge channel 4144a in the thickness direction of the first shell wall 11, the discharge channel 4144a on the third support 4143 can connect the two sides of the third support 4143 in the length direction of the first shell wall 11 with the pressure relief structure 5. The connecting hole 4145 on the third support 4143 can connect the side of the third support 4143 facing the active material coating part 31 with the pressure relief structure 5, so that multiple sides of the third support 4143 can be connected to the pressure relief structure 5, which is beneficial to improving the pressure relief smoothness of the battery cell 100.

[0196] Furthermore, each of the first support portion 4141 and the second support portion 4142 is provided with a discharge channel 4144a, a weight reduction hole 4144b, and a connecting hole 4145, so as to enrich the functions of the first support portion 4141 and the second support portion 4142 while ensuring reliable support for the cell assembly 3, thereby improving the reliability of the battery cell 100.

[0197] For example, the structure of the first support portion 4141 is the same as that of the second support portion 4142; the following description takes the first support portion 4141 as an example: the first support portion 4141 has multiple discharge channels 4144a and multiple weight-reducing holes 4144b, and the multiple discharge channels 4144a and multiple weight-reducing holes 4144b are alternately arranged in the width direction of the first shell wall 11. The side of each discharge channel 4144a facing away from the active material coating portion 31 is open, and each discharge channel 4144a... The side of 4a facing the active material coating part 31 is closed, and the side of each weight reduction hole 4144b facing away from the active material coating part 31 is open. The side of each weight reduction hole 4144b facing the active material coating part 31 is closed. The portion of the first support part 4141 corresponding to the side of the discharge channel 4144a and the side of the weight reduction hole 4144b facing the active material coating part 31 is flush. The connecting hole 4145 on the first support part 4141 is formed on the closed side of the weight reduction hole 4144b.

[0198] Referring to Figure 4, in some embodiments, the pole assembly 2 further includes an insulating structure 23, which is insulatingly fitted between the clamping structure 22 and the pole body 21. The insulating structure 23 can insulate the clamping structure 22 and the pole body 21 at their mating positions, preventing a short circuit between the pole body 21 and the clamping structure 22.

[0199] In the above technical solution, the pole assembly 2 has a simple structure and is easy to process. Since the pole assembly 2 includes two parts, the pole body 21 and the clamping structure 22, the shape and size of the pole body 21 and the clamping structure 22 can be designed separately based on different factors to flexibly adapt to the connection requirements of different types of housing assembly 1 and battery cell assembly 3, thereby increasing the applicability of the pole assembly 2.

[0200] Optionally, as shown in FIG7, the insulating structure 23 further includes an insulating member 232, and the clamping structure 22 includes a first adapter ring 221 and a second adapter ring 222. The second adapter ring 222 is disposed on the side of the first adapter ring 221 away from the battery cell component 3. The second adapter ring 222 is connected to the first adapter ring 221, and the first adapter ring 221 is connected to the first shell wall 111. The sealing structure member 231 is clamped between the first adapter ring 221 and the peripheral portion of the electrode body 21. The second adapter ring 222 is insulated from and fixedly fitted to the peripheral portion 212 through the insulating member 232.

[0201] Therefore, the clamping structure 22 includes a first adapter ring 221 and a second adapter ring 222 that are arranged internally and externally and assembled together, which facilitates the assembly and connection of the clamping structure 22 with the insulating structure 23 and the pole body 21, making the pole component 2 easy to process and manufacture, and making it easy to control the compression of the sealing structure 231, thereby improving the sealing reliability.

[0202] Referring again to Figure 10, the clamping structure 22, by way of example, further includes an insulating frame 223 connected to the side of the first adapter ring 221 facing the cell assembly 3. Thus, the insulating frame 223 can serve as insulation between the cell assembly 3 and the first adapter ring 221, reducing the difficulty of setting up the insulation structure here. By way of example, the insulating frame 223 has a pin, and the first adapter ring 221 has a socket; the pin is interference-fitted into the socket to connect the insulating frame 2234 to the first adapter ring 221.

[0203] For example, when the terminal assembly 2 includes the aforementioned terminal body 21, clamping structure 22 and insulating structure 23, during the assembly of the battery cell 100, "connecting the cell assembly 3 to the terminal assembly 2" may specifically include: connecting the cell assembly 3 to the terminal body 21; setting the terminal assembly 2 connected to the cell assembly 3 at the mounting hole 111; and connecting the clamping structure 22 to the first shell wall 11.

[0204] Please refer to Figures 6 and 7. In some embodiments, the insulating structure 23 is also sealed between the clamping structure 22 and the terminal body 21. Therefore, the insulating structure 23 not only insulates the clamping structure 22 from the terminal body 21, but also seals the mating position between the clamping structure 22 and the terminal body 21. This isolates the inside and outside of the housing assembly 1 after the clamping structure 22 is connected to the first housing wall 11, reducing the risk of electrolyte leakage from the mating position between the clamping structure 22 and the terminal body 21 to the outside of the housing assembly 1, and reducing the risk of liquids or dust from outside the housing assembly 1 entering the housing assembly 1 from the mating position between the clamping structure 22 and the terminal body 21, thereby improving the reliability of the battery cell 100.

[0205] In the above technical solution, since the insulating structure 23 is also sealed between the clamping structure 22 and the pole body 21, when installing the pole assembly 2 onto the first shell wall 11 and connecting the clamping structure 22 and the first shell wall 11, there is no need to set a seal 231 between the clamping structure 22 and the first shell wall 11. This eliminates the need to apply a large sealing pressure to meet the compression requirements of the seal 231, thereby reducing the stress on the first shell wall 11 and protecting the shell assembly 1. This helps to reduce the wall thickness of the shell assembly 1 and lower material costs. Furthermore, since the first shell wall 11 is the end opposite the shell body 12 and the opening 121, the stress at the connection between the first shell wall 11 and the second shell wall 114, as well as the stress on the second shell wall 114, can be reduced. This helps to ensure the reliability of the shell body 12 and lower the wall thickness and cost of the shell body 12.

[0206] Referring again to FIG7, in some embodiments of this application, the insulating structure 23 includes a seal 231. In embodiments of this application, the seal 231 is made of a material that is both sealing and insulating, such as an elastic rubber element. Referring again to FIG7, by way of example, at least a portion of the seal 231 is clamped between the clamping structure 22 and the pole body 21 in the thickness direction of the first shell wall 11.

[0207] In the embodiments of this application, the direction from the inner side of the first shell wall 11 to the outer side of the first shell wall 11, and the direction from the outer side of the first shell wall 11 to the inner side of the first shell wall 11, are collectively referred to as the "thickness direction of the first shell wall 11". The "inner side of the first shell wall 11" refers to the side of the first shell wall 11 facing the cell assembly 3, and the "outer side of the first shell wall 11" refers to the side of the first shell wall 11 away from the cell assembly 3.

[0208] The seal 231 includes at least a axial side portion 231a. The side of the axial side portion 231a facing the receiving cavity 10 is the inner side of the axial side portion 231a, and the side of the axial side portion 231a away from the cell assembly 3 is the outer side of the axial side portion 231a. One of the clamping structure 22 and the electrode body 21 is partially clamped on the outer side of the axial side portion 231a, and the other is partially clamped on the inner side of the axial side portion 231a. Thus, the axial side portion 231a is clamped between the clamping structure 22 and the electrode body 21 in the inward and outward directions of the first shell wall 11 to achieve an axial seal between the clamping structure 22 and the electrode body 21.

[0209] Therefore, by providing at least a portion of the sealing element 231 to be clamped between the clamping structure 22 and the pole body 21 in the inward and outward directions of the first housing wall 11, an axial seal is achieved between the clamping structure 22 and the pole body 21. This axial seal provides a more reliable sealing effect and improves the leakage problem at the mating position of the clamping structure 22 and the pole body 21. Furthermore, by integrating the axial seal, such as the axial side portion 231a, into the pole assembly in the embodiments of this application, the axial force on the first housing wall 11 can be reduced.

[0210] Referring again to Figure 7, exemplarily, the sealing element 231 is circumferentially disposed on the periphery of the clamping structure 22 facing the pole body 21, i.e., the inner ring of the clamping structure 22. In the embodiments of this application, since the clamping structure 22 is disposed around the pole body 21 and connected to the first shell wall 11, the periphery of the clamping structure 22 facing the pole body 21 is the "inner ring of the clamping structure 22", and the periphery of the clamping structure 22 facing the first shell wall 11 is the "outer ring of the clamping structure 22". In the above technical solution, by circumferentially disposing the sealing element 231 on the inner ring of the clamping structure 22, the sealing element 231 can be close to the mating position of the clamping structure 22 and the pole body 21, which is beneficial to sealing the mating position of the clamping structure 22 and the pole body 21 with a shorter path, improving the reliability of the seal, and also helps to reduce the size of the sealing element 231, reduce the sealing area, make it easier to achieve compression sealing, reduce the risk of seal failure, and improve the sealing effect.

[0211] Furthermore, when the insulating structure 23 includes a seal 231, which is clamped between the clamping structure 22 and the pole body 21 to achieve a sealed fit between the clamping structure 22 and the pole body 21, and the clamping structure 22 is formed as an elongated strip extending along the length direction of the first shell wall 11, and the pole body 21 is located at the center of the length of the clamping structure 22 and is circular, the force at the connection position between the clamping structure 22 and the pole body 21 is uniform, making it easy to control the compression of the seal 231, thereby improving the reliability of the sealed fit between the clamping structure 22 and the pole body 21. Moreover, the sealing area is relatively small, making it less prone to failure.

[0212] Please refer to Figures 6, 7 and 10. In some embodiments, the first shell wall 11 has a mounting hole 111, the pole post assembly 22 is disposed on the mounting hole 111, and the edge of the clamping structure 22 overlaps one side of the first shell wall 11 in the wall thickness direction. In this way, by disposing of the clamping structure 22 on one side of the first shell wall 11 in the wall thickness direction, that is, disposing of the clamping structure 22 on the outside of the first shell wall 11 or disposing of the clamping structure 22 on the inside of the first shell wall 11, it is convenient to assemble the clamping structure 22 with the first shell wall 11.

[0213] Exemplarily, the clamping structure 22 is welded to the first shell wall 11. For example, after the clamping structure 22 is placed on the first shell wall 11, the clamping structure 22 and the first shell wall 11 can be connected by welding, which facilitates processing and can better ensure the reliability of the connection between the clamping structure 22 and the first shell wall 11. For example, welding can be performed from the outside of the first shell wall 11 so that the weld formed by the connection is exposed on the side of the first shell wall 11 away from the cell assembly 3, that is, the side away from the active material coating part 311, thereby facilitating welding operations and increasing the welding space. This application is not limited to this. For example, in some other embodiments of this application, the clamping structure 22 can also be configured to pass through the mounting hole 111 and be riveted to the first shell wall 11, etc.

[0214] For example, when the cell assembly 3 and the terminal assembly 2 are connected first, and then the terminal assembly 2 is assembled and connected to the first shell wall 11, the cell assembly 3 and the terminal assembly 2 can be connected first, for example, after the cell assembly 3 and the terminal assembly 2 are connected, and then installed together into the shell 12, and then the terminal assembly 2 extends out of the mounting hole 111 to the outside of the first shell wall 11; or for example, the cell assembly 3 is installed into the shell 12, the conductive part 32 passes through the mounting hole 111 and is connected to the terminal assembly 2 which is pre-set on the outside of the first shell wall 11, and the terminal assembly 2 is covered at the mounting hole 111 of the first shell wall 11 from the outside of the first shell wall 11, that is, the side away from the active material coating part 31. At this time, the edge of the clamping structure 22 overlaps the side of the first shell wall 11 away from the cell assembly 3. Therefore, since the pole assembly 2 is covered by the first housing wall 11 from the outside, it is convenient to assemble and connect the pole assembly 2 with the first housing wall 11, which helps to improve the connection reliability between the pole assembly 2 and the first housing wall 11.

[0215] Referring to Figure 6, in some embodiments, when the edge of the clamping structure 22 overlaps the side of the first shell wall 11 away from the cell assembly 3, a recessed groove 112 surrounding the mounting hole 111 can be provided on the first shell wall 11. The recessed groove 112 opens in the direction away from the cell assembly 3, that is, it opens in the direction away from the active material coating portion 31. The edge of the clamping structure 22 is embedded in the recessed groove 112, wherein the edge of the clamping structure 22 has a flange portion 22a surrounding the clamping structure 22, and the flange portion 22a is embedded in the recessed groove 112. This facilitates the support and positioning of the connection between the clamping structure 22 and the first shell wall 11, and is beneficial for welding the two together from the outside of the first shell wall 11, that is, the side away from the active material coating portion 31.

[0216] For example, the thickness of the flange portion 22a matches the depth of the groove 112, where "matching" means that the thickness of the flange portion 22a and the depth of the groove 112 are substantially the same. This facilitates welding of the flange portion 22a to the first shell wall 11. The thickness of the flange portion 22a is not too large relative to the depth of the groove 112, reducing unnecessary space occupation, and the thickness of the flange portion 22a is not too small relative to the depth of the groove 112, thus meeting welding strength requirements.

[0217] Of course, in other embodiments of this application, when the cell assembly 3 and the terminal assembly 2 are connected first, and then the terminal assembly 2 is assembled and connected to the first shell wall 11, the cell assembly 3 and the terminal assembly 2 can be installed together into the shell body 12 after the cell assembly 3 and the terminal assembly 2 are connected. In this way, the terminal assembly 2 can be placed on the mounting hole 111 of the first shell wall 11 from the inside side of the first shell wall 11, i.e., the side facing the active material coating part 31. At this time, the edge of the clamping structure 22 overlaps with the side of the first shell wall 11 facing the cell assembly 3. Therefore, since the terminal assembly 2 is provided in the mounting hole 111 from the inside side of the first shell wall 11, the cell assembly 3 and the terminal assembly 2 can be installed together into the shell body 12 without the terminal assembly 2 passing through the mounting hole 111, thereby reducing the number of operation steps and reducing the difficulty of operation.

[0218] In some embodiments, referring again to Figures 6-8, the electrode assembly 2 forms a receiving groove 20 that is recessed relative to the first shell wall 11 in a direction away from the cell assembly 3 and open in a direction towards the cell assembly 3. At least a portion of the conductive portion 32 is received in the electrode body 21 of the receiving groove 20. That is, the electrode assembly 2 forms the receiving groove 20, the groove wall of the receiving groove 20 is formed by the electrode assembly 2, the receiving groove 20 is recessed in a direction away from the active material coating portion 31, and the receiving groove 20 is open in a direction towards the active material coating portion 31, so that the receiving groove 20 communicates with the receiving cavity 10.

[0219] Therefore, by providing a receiving groove 20 to accommodate the conductive part 32, the space occupied by the conductive part 32 in the receiving cavity 10 can be reduced, allowing the receiving cavity 10 to have a larger space to accommodate the active material coating part 31. This is beneficial for increasing the volume of the active material coating part 31, thereby increasing the energy density of the battery cell 100. Moreover, since the receiving groove 20 is open towards the cell assembly 3, the conductive part 32 can be easily inserted into the receiving groove 20, reducing the difficulty of operation.

[0220] For example, referring again to Figures 6-8, the receiving groove 20 is formed on the side of the electrode body 21 and the clamping structure 22 facing the cell assembly 3, that is, facing the active material coating part 31. The clamping structure 22 protrudes relative to the first shell wall 11 in the direction away from the cell assembly 3, that is, away from the active material coating part 31, so that the receiving groove 20 is recessed relative to the first shell wall 11 in the direction away from the cell assembly 3.

[0221] Therefore, by processing the clamping structure 22 into an outwardly protruding shape, a portion of the receiving groove 20 is formed on the side of the electrode body 21 facing the cell assembly 3, and another portion of the receiving groove 20 is formed on the side of the clamping structure 22 facing the cell assembly 3. The receiving groove 20 has a shape that is concave relative to the first shell wall 11 in the direction away from the cell assembly 3. Thus, both the side of the electrode body 21 facing the cell assembly 3 and the side of the clamping structure 22 facing the cell assembly 3 have a space receiving groove 20 conductive part 32. This not only facilitates the storage of the conductive part 32 to a greater extent, but also facilitates the design of diverse forms of the conductive part 32.

[0222] Referring to Figure 4, in some embodiments, the housing assembly 1 includes a housing body 12 and a housing cover 13. The housing body 12 is a single piece, with one end open, and the housing cover 13 is disposed at the open end of the housing body 12. Exemplarily, the open end of the housing body 12 has an opening 121, and the housing cover 13 covers the opening 121. The housing body 12 and the housing cover 13 together form a receiving cavity 10. Referring to Figure 4, a first housing wall 11 is located at the end of the housing body 12 away from the housing cover 13; that is, the housing wall at the end of the housing body 12 opposite to the opening 121 is the first housing wall 11; or, the first housing wall 11 is formed on the housing cover 13, then the housing cover 13 serves as the first housing wall 11.

[0223] Of course, in other examples, the housing assembly 1 may also include two housings 12, each housing 12 having an open end forming an opening 121, the openings 121 of the two housings 12 being opposite to each other and overlapping each other, the two housings 12 together forming a receiving cavity 10, and the end of one housing 12 opposite to the opening 121 being a first housing wall 11.

[0224] In some embodiments, referring to FIG4, the housing assembly 1 includes a housing body 12 that participates in forming a receiving cavity 10. One end of the housing body 12 is open to form an opening 121, and the shell wall at the end of the housing body 12 opposite to the opening 121 is a first shell wall 11. It is understood that the housing body 12 is a one-piece molded part and includes a first shell wall 11 and a second shell wall 114. The second shell wall 114 surrounds the edge of the first shell wall 11 and extends from the edge of the first shell wall 11 toward one side in the thickness direction of the first shell wall 11. The end of the second shell wall 114 away from the first shell wall 11 has an opening 121, and a cavity is formed between the first shell wall 11 and the second shell wall 114, the cavity constituting at least a portion of the receiving cavity 10.

[0225] When the housing assembly 1 includes a shell body 12 with an opening 121 at one end, the housing assembly 1 also includes a shell body fitting structure. The shell body fitting structure fits with the shell body 12 to cover the opening 121 and together with the shell body 12, forms a receiving cavity 10. For example, the shell body 12 is semi-closed cylindrical, and the shell body fitting structure is flat, that is, the shell body fitting structure can be a shell cover 13. In this case, the housing assembly 1 can be a combination of the shell body 12 and the shell cover 13. Another example is that the shell body 12 is semi-closed cylindrical, and the shell body fitting structure can be semi-closed cylindrical, that is, the shell body fitting structure can be the other half of the shell body 12. In this case, the housing assembly 1 can be a combination of two shell bodies 12, etc. Yet another example is that the shell body fitting structure can be a shell assembly, which is assembled from multiple parts. Thus, the housing assembly 1 has various forms and can adapt to various application scenarios.

[0226] For example, referring to FIG4, the housing assembly 1 may include a housing body 12 and a housing cover 13. One end of the housing body 12 has an opening 121, and the housing cover 13 closes to the opening 121. The housing body 12 and the housing cover 13 together form a receiving cavity 10, and the end of the housing body 12 opposite to the opening 121 serves as a first housing wall 11. Alternatively, for example, the housing assembly 1 may include two housing bodies 12, each housing body 12 having an opening 121 at one end. The openings 121 of the two housing bodies 12 are opposite to each other and close to each other. The two housing bodies 12 together form a receiving cavity 10, and the end of one housing body 12 opposite to the opening 121 serves as a first housing wall 11.

[0227] In the above technical solution, when the end wall of the shell 12 opposite to the opening is the first shell wall 11, since the cell assembly 3 housed in the shell assembly 1 is connected to the terminal assembly 2 installed on the first shell wall 11, when the battery device 200 vibrates or deforms, the terminal assemblies 2 connected by the busbar will pull on each other. Since the terminal assembly 2 is set on the end wall of the shell 12 opposite to the opening 121, the force on the terminal assembly 2 will be preferentially transmitted to the shell 12, and will not directly act on the shell mating structure such as the shell cover 13. This not only extends the distance of force transmission to the connection between the shell 12 and the shell mating structure such as the shell cover 13, but also causes the shell 12 to deform preferentially when under force, thereby reducing the force on the connection between the shell 12 and the shell mating structure such as the shell cover 13. This can effectively reduce the probability of cracking at the connection between the shell 12 and the shell mating structure such as the shell cover 13 during the use of the battery 100, and improve the reliability of the battery cell 100. Furthermore, since the connection between the casing 12 and the casing mating structure, such as the casing cover 13, is less prone to cracking, there is no need to increase the wall thickness of either component to improve the reliability of the connection. This helps reduce weight and material costs, and facilitates the miniaturization of the battery cell 100 or increases the energy density of the battery cell 100. The connection method between the casing 12 and the casing mating structure is not limited; for example, it can be bonding, welding, etc.

[0228] For example, when the end wall of the housing 12 opposite to the opening 121 serves as the first housing wall 11 for mounting the terminal assembly 2, if the terminal assembly 2 is first installed in the mounting hole 111 of the first housing wall 11, and then the cell assembly 3 is installed into the housing 12, it is difficult to connect the cell assembly 3 and the terminal assembly 2. In some embodiments of this application, the cell assembly 3 and the terminal assembly 2 can be connected first, and then the terminal assembly 2 can be assembled and connected to the housing assembly 1. This satisfies the connection requirements between the cell assembly 3 and the terminal assembly 2, as well as the connection requirements between the terminal assembly 2 and the housing assembly 1, thereby improving the reliability and manufacturability of the battery cell 100.

[0229] Moreover, this processing sequence allows the length of the conductive part 32 to be effectively shortened. For example, as long as the cell assembly 3 and the terminal assembly 2 are connected first, and the terminal assembly 2 and the housing assembly 1 are connected later, the material and cost of the conductive part 32 can be saved, the redundancy of the conductive part 32 can be reduced, the risk of short circuit can be reduced, and the space occupied by the conductive part 32 in the housing assembly 1 can be reduced, which is conducive to improving the energy density of the battery cell 100.

[0230] Referring to Figure 3, in some embodiments of this application, the battery cell 100 further includes a pressure relief structure 5, which is disposed on the housing assembly 1. Exemplarily, the pressure relief structure 5 can be an explosion-proof valve installed on the housing assembly 1, or it can be integrally formed on a thinned area of ​​the housing assembly 1. Therefore, by providing the pressure relief structure 5, when the pressure inside the housing assembly 1 exceeds a preset value, the pressure can be directionally released through the pressure relief structure 5, thereby improving the reliability of the battery cell 100. The pressure relief structure 5 can be disposed on the first housing wall 11, or on other housing walls besides the first housing wall 11, and the first housing wall 11 can be one or more.

[0231] For example, referring to Figure 3, the pressure relief structure 5 and the terminal assembly 2 are located on the same side. Since the terminal assembly 2 is located on the first housing wall 11, when the pressure relief structure 5 is also located on the first housing wall 11, the pressure relief structure 5 and the terminal assembly 2 are located on the same side. This simplifies the design of the other housing walls besides the first housing wall 11, and simplifies the structure and processing of the battery cell 100.

[0232] For example, the pressure relief structure 5 and the pole assembly 2 are located on opposite sides. Since the pole assembly 2 is located on the first shell wall 11, when the pressure relief structure 5 is located on a wall of the housing assembly 1 other than the first shell wall 11, such as on the second shell wall 114 or on the shell cover 13, the pressure relief structure 5 and the pole assembly 2 are located on opposite sides. Therefore, there is no need to consider reducing the volume of the pole assembly 2 by occupying the space of the first shell wall 11 with the pressure relief structure 5, so that the shape and volume of the pole assembly 2 can be flexibly designed as needed.

[0233] For example, the housing assembly 1 can be surrounded by multiple non-coplanar housing walls. For example, the cuboid housing wall component is surrounded by six housing walls, one of which is the first housing wall 11. The pressure relief structure 5 is placed on any other housing wall other than the first housing wall 11, and the pole assembly 2 is placed on the first housing wall 11, so the two are located on opposite sides.

[0234] Secondly, embodiments of this application provide a battery device 200, which includes a plurality of the aforementioned battery cells 100.

[0235] In the above technical solution, the performance of the battery device 200 can be improved by using the aforementioned battery cell 100.

[0236] Thirdly, embodiments of this application provide an electrical device 500, including the aforementioned battery device 200, which is used to store or provide electrical energy.

[0237] In the above technical solution, the improved performance of the battery device 200 is beneficial to improving the working performance of the power-consuming device 500.

[0238] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0239] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, wherein, include: A housing assembly having a receiving cavity and including a first housing wall that participates in forming the receiving cavity; An electrode assembly includes an electrode body and a clamping structure, wherein the clamping structure clamps the electrode body and is connected to the first shell wall; A battery cell assembly is housed in the receiving cavity and includes an active material coating portion and a conductive portion, wherein the conductive portion connects the active material coating portion and the electrode body; An insulating support is disposed between the active material coating portion and the first shell wall. The insulating support includes a support body and a support member. The support body has a first through hole, and the conductive portion passes through the first through hole. The support member supports the side of the conductive portion facing the active material coating portion.

2. The battery cell according to claim 1, wherein, The support member supports the portion of the conductive part that passes through the first through hole; or... The conductive part includes a first segment and a second segment. The first segment is connected between the active material coating part and the second segment, and the second segment passes through the first perforation. The support member supports the first segment.

3. The battery cell according to claim 1 or 2, wherein, The conductive portion includes a bent section, and the bent section has an open groove. The opening of the slot faces the side where the support member is located, and the support member extends into the opening slot and abuts against the bent section; or, The opening of the groove is located on the side opposite to the support member, and the support member abuts against the side of the bent section facing the active material coating part.

4. The battery cell according to claim 3, wherein, The support member is cantilevered, with its fixed end connected to the wall of the first through hole, and its free end abutting against the bent section; or, The support member is located on the side of the support body facing the active material coating portion, and the two ends of the support member in the width direction of the first shell wall are respectively connected to the opening grooves that extend into different conductive portions.

5. The battery cell according to claim 3 or 4, wherein, The battery cell assembly comprises multiple cells arranged sequentially along the width direction of the first shell wall, and the battery cell is configured to satisfy any one of the following conditions: Condition A1: The conductive portions of all the battery cell assemblies of the same polarity converge and connect to form a first converged portion, and the first converged portion has the bending segment. Condition A2: The electrode assembly corresponds to the middle position of the plurality of battery cell assemblies in the width direction of the first shell wall. The conductive parts of the same polarity of the battery cell assemblies located on the same side of the middle position converge and connect to form a second convergence part, and the second convergence part has the bending section.

6. The battery cell according to claim 5, wherein, The battery cell satisfies condition A2. The middle position has a first side and a second side on either side of the width of the first shell wall. The support members are multiple and include a first support member and a second support member spaced apart in the length of the first shell wall. The first support member and the second support member respectively abut against the conductive parts of the same polarity of different battery cell assemblies. The first support member is located on the first side, and the second support member is located on the second side. A portion of the bent section corresponding to the cell assembly located on the first side extends to the second side at the middle position, and the second support abuts against the side of the bent section corresponding to the cell assembly located on the first side facing the active material coating portion. A portion of the bent section corresponding to the cell assembly located on the second side extends to the first side at the middle position, and the first support abuts against the side of the bent section corresponding to the cell assembly located on the second side facing the active material coating portion.

7. The battery cell according to claim 5, wherein, The battery cell satisfies condition A2, with the middle position having a first side and a second side on either side of the first shell wall width direction, and the support member abutting against the conductive portions of the same polarity of different battery cell assemblies at both ends of the first shell wall width direction. One end of the support member extends into the opening groove of the bent section located on the first side. The other end of the support abuts against the conductive portion of the battery cell assembly located on the second side.

8. The battery cell according to claim 7, wherein, The support member extends from both ends of the first shell wall in the width direction toward the end of the bracket body to the end adjacent to the end of the bracket body. The two ends of the support member and the end of the bracket body each have a second through hole for the conductive part to pass through.

9. The battery cell according to claim 8, wherein, The support member includes a first plate portion and two second plate portions. The two second plate portions are respectively disposed at both ends of the first plate portion. Each second plate portion has a second through hole with the bracket body, and the two second plate portions extend inclined towards the bracket body in a direction away from each other.

10. The battery cell according to any one of claims 1-9, wherein, The insulating support also includes a pressing member that is spaced apart from the support member, the conductive part passing through the gap between the support member and the pressing member, and the pressing member pressing against the side of the conductive part opposite to the active material coating part.

11. The battery cell according to claim 10, wherein, The conductive portion includes a bent section with an open groove. The support member corresponding to the pressing member extends into the open groove and abuts against the bent section. The pressing member abuts against the side of the bent section opposite to the active material coating portion.

12. The battery cell according to any one of claims 1-11, wherein, The main body of the bracket and the supporting member are a single piece; or... The main body of the bracket and the supporting member are separate parts, and the two are fixed by heat fusion, snap-fit ​​or adhesive bonding.

13. The battery cell according to any one of claims 1-12, wherein, The clamping structure is integrally formed on the first shell wall; or, the clamping structure is welded and fixed to the first shell wall.

14. The battery cell according to any one of claims 1-12, wherein, The main body of the support also has a partition portion, which is arranged around the first perforation. The clamping structure is welded and fixed to the first shell wall, and the welding position of the clamping structure and the first shell wall is opposite to the partition portion along the thickness direction of the first shell wall, so that the partition portion separates the welding position of the clamping structure from the active material coating portion.

15. The battery cell according to claim 14, wherein, The partition has an annular groove, which is open on one side facing the welding position.

16. The battery cell according to claim 15, wherein, The partition includes a first part and a second part. The first part is opposite to the welding position along the thickness direction of the first shell wall, and the second part is bent and connected to the end of the first part away from the central axis of the first perforation and extends toward the welding position.

17. The battery cell according to claim 14, wherein, The partition is constructed as a flat plate structure.

18. The battery cell according to any one of claims 1-17, wherein, A liquid injection hole is formed on the first shell wall, and a liquid injection channel is formed on the support body. The liquid injection channel penetrates the side surface of the support body facing the first shell wall to form a liquid inlet. The liquid inlet is opposite to the liquid injection hole. The side of the liquid injection channel facing the active material coating part is at least partially closed. A liquid outlet is formed on the peripheral wall of the liquid injection channel and / or on the side wall of the liquid injection channel facing the active material coating part. The liquid outlet communicates with the space between the support body and the active material coating part.

19. The battery cell according to any one of claims 1-18, wherein, The main body of the support also includes a support portion and a connecting portion. In the thickness direction of the first shell wall, the thickness of the support portion is greater than the thickness of the connecting portion, so that the support portion protrudes from the connecting portion toward the active material coating portion. There are n support portions, which are spaced apart along the length direction of the first shell wall, where n≥3 and n is a positive integer. The connecting portion connects two adjacent support portions. The support portion abuts between the first shell wall and the active material coating portion. The first perforation is formed on the connecting portion.

20. The battery cell according to claim 19, wherein, At least one of the support portions has a weight-reducing structure.

21. The battery cell according to claim 20, wherein, The weight reduction structure includes: A discharge channel extending along the length of the first shell wall to penetrate opposite sides of the portion of the support that protrudes from the connecting portion; and / or, Weight reduction holes are provided at both ends of the first shell wall along its length.

22. The battery cell according to claim 21, wherein, The weight reduction structure includes an exhaust channel and a weight reduction hole, and there are multiple exhaust channels and weight reduction holes, which are alternately arranged in the width direction of the first shell wall.

23. The battery cell according to claim 21 or 22, wherein, The weight reduction structure includes an exhaust channel and a weight reduction hole. The side of the exhaust channel and the weight reduction hole facing away from the active material coating part are both open, and the side facing the active material coating part is both closed.

24. The battery cell according to claim 23, wherein, The support portion is flush with the side of the discharge channel and the weight reduction hole facing the active material coating portion.

25. The battery cell according to any one of claims 21-24, wherein, The weight-reducing structure has a connecting hole that connects the two opposite sides of the support portion in the thickness direction of the first shell wall. The weight reduction structure includes a discharge channel, which is closed on one side in the thickness direction of the first shell wall, and the discharge channel has a connecting hole formed on the closed side in the thickness direction of the first shell wall; and / or, The weight reduction structure includes a weight reduction hole, which is closed on one side in the thickness direction of the first shell wall, and the connecting hole is formed on the closed side of the weight reduction hole in the thickness direction of the first shell wall.

26. The battery cell according to claim 25, wherein, The plurality of support portions include a first support portion, a second support portion, and a third support portion. The first support portion and the second support portion are respectively located at both ends of the length of the bracket body, and the third support portion is spaced between the first support portion and the second support portion. The first shell wall is provided with a pressure relief structure, the third support part is opposite to the pressure relief structure, the third support part is formed with the discharge channel and the connecting hole, and each of the first support part and the second support part is respectively formed with the discharge channel, the weight reduction hole and the connecting hole.

27. The battery cell according to any one of claims 1-26, wherein, The pole assembly also includes an insulating structure that is insulated and sealed between the clamping structure and the pole body.

28. The battery cell according to claim 27, wherein, The insulating structure includes a seal that surrounds the pole body, and at least a portion of the seal is clamped between the clamping structure and the pole body in the thickness direction of the first shell wall.

29. The battery cell according to claim 27, wherein, The first shell wall has a mounting hole, the pole assembly is covered by the mounting hole, and the outer periphery of the clamping structure is overlapped and welded to one side of the first shell wall surrounding the mounting hole in the thickness direction of the first shell wall.

30. The battery cell according to claim 29, wherein, The clamping structure has a flange on its outer periphery, and a groove is formed on the first shell wall surrounding the mounting hole, with the flange engaging with the groove.

31. The battery cell according to any one of claims 1-30, wherein, The electrode assembly forms a receiving groove that is recessed relative to the first shell wall in a direction away from the cell assembly and open in a direction towards the cell assembly, and at least a portion of the conductive part is received in the receiving groove.

32. The battery cell according to any one of claims 1-31, wherein, The housing assembly includes a housing body and a housing cover. The housing body is a single piece with one end open, and the housing cover is located at the open end of the housing body. The end of the shell body opposite to the shell cover is the first shell wall; Alternatively, the shell cover may be the first shell wall.

33. The battery cell according to any one of claims 1-32, wherein, Also includes: A pressure relief structure is provided on the housing assembly and is located on the same side or opposite side to the pole assembly.

34. A battery device, wherein, It includes multiple battery cells according to any one of claims 1-33.

35. An electrical appliance, wherein, Includes the battery device according to claim 34, the battery device being used to provide electrical energy.

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