Battery cell, battery device, and electric device

Abstract

The utility model discloses a single battery, a battery device and a power utilization device, the single battery comprises a shell assembly, a pole assembly, a battery cell assembly and an insulation support, the shell assembly is provided with a containing cavity and comprises a first shell wall, the pole assembly comprises a pole main body and a clamping structure, the clamping structure clamps the pole main body, the clamping structure is connected with the first shell wall, and the first shell wall is provided with a second shell wall. The insulating support comprises a support body and a supporting piece, the support body is provided with a first through hole, the conductive part penetrates through the first through hole, and the supporting piece supports the side, facing the active substance coating part, of the conductive part. Therefore, the battery monomer can reduce the risk of short circuit of the battery core assembly, and has good use reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable important role. Among them, the battery as the core part of new energy vehicles has a high demand in reliability.

[0003] In the related art, the cell assembly of the battery monomer is prone to short circuit, affecting the normal operation of the battery monomer. Utility model content

[0004] The embodiments of the present application provide a battery monomer, a battery device and a power utilization device, which can reduce the risk of short circuit of the cell assembly and have good use reliability.

[0005] In a first aspect, the embodiments of the present application provide a battery monomer, comprising: a shell assembly having a receiving cavity and comprising a first shell wall participating in enclosing the receiving cavity; a pole column assembly comprising a pole column main body and a clamping structure, the clamping structure clamping the pole column main body, and the clamping structure being connected with the first shell wall; a cell assembly received in the receiving cavity and comprising an active material coating part and a conductive part, the conductive part connecting the active material coating part and the pole column main body; and an insulating support arranged between the active material coating part and the first shell wall, the insulating support comprising a support main body and a support piece, the support main body having a first through hole, the conductive part being arranged in the first through hole, and the support piece supporting a side of the conductive part facing the active material coating part.

[0006] In the above technical solution, the support piece is arranged on the support main body, which can support the conductive part, facilitate the conductive part to maintain a predetermined form, and be conducive to controlling the form and position of the conductive part. In addition, the support piece can also block a part of the conductive part and 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, and improve the reliability of the battery monomer.

[0007] In some embodiments, the support piece supports the part of the conductive part arranged in the first through hole; or the conductive part comprises a first segment and a second segment, the first segment is connected between the active material coating part and the second segment, the second segment is arranged in the first through hole, and the support piece supports the first segment. In this way, the specific position of the support piece supporting the conductive part has certain flexibility in arrangement, and the support arrangement of the support piece and the arrangement of the conductive part arranged in the first through hole do not easily interfere with each other, which facilitates the convenient assembly of the battery monomer.

[0008] In some embodiments, the conductive part comprises a bent segment, the bent segment is formed with an open slot, an opening of the open slot is arranged towards a side where the support is located, the support extends into the open slot and abuts against the bent segment; or, the opening of the open slot is arranged away from the side where the support is located, and the support abuts against a side of the bent segment facing the active material coating part.

[0009] In the above technical solution, the support can support and / or press the bent segment, so that the bent segment can maintain a preset bent shape, and the bent shape of the conductive part and the position of the bent segment can be controlled, and the support can also block between a part of the bent segment and 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 of the battery monomer, and improve the use reliability of the battery monomer.

[0010] In some embodiments, the support is cantilevered and the fixed end of the support is connected to the hole wall of the first through hole, and the free end of the support abuts against the bent segment; or, the support is located on a side of the support body facing the active material coating part, and the two ends of the support in the width direction of the first shell wall respectively extend into the open slots of different conductive parts. In this way, the support has good design flexibility on the premise of supporting the conductive part, so as to adapt to different needs.

[0011] In some embodiments, the plurality of cell assemblies are sequentially arranged along the width direction of the first shell wall, and the battery monomer is configured to satisfy any one of the following conditions: condition A1, the same polarity conductive parts of all cell assemblies converge and are connected to form a first converging part, and the first converging part is formed with a bent segment; condition A2, the pole assembly corresponds to a middle position of the plurality of cell assemblies in the width direction of the first shell wall, the same polarity conductive parts of the cell assemblies located on the same side of the middle position converge and are connected to form a second converging part, and the second converging part is formed with a bent segment. In this way, the battery monomer is designed flexibly, and different arrangements of the conductive parts of the cell assemblies can be limited by matching supports.

[0012] In some embodiments, the battery monomer satisfies condition A2, the two sides of the middle position in the width direction of the first shell wall are respectively a first side and a second side, the support comprises a plurality of supports including a first support and a second support arranged at intervals in the length direction of the first shell wall, the first support and the second support respectively abut against the same polarity conductive parts of different cell assemblies, the first support is located on the first side, the second support is located on the second side, a part of the bent segment corresponding to the cell assembly located on the first side extends to the second side of the middle position, the second support abuts against a side of the bent segment corresponding to the cell assembly located on the first side facing the active material coating part, a part of the bent segment corresponding to the cell assembly located on the second side extends to the first side of the middle position, and the first support abuts against a side of the bent segment corresponding to the cell assembly located on the second side facing the active material coating part.

[0013] In the technical solution, the first support member and the second support member are arranged oppositely in the first shell wall width direction and are staggered in the first shell wall length direction. The first support member abuts against the conductive part of the cell assembly on one side of the middle position, and the second support member abuts against the conductive part of the cell assembly on the other side of the middle position. In this way, the arrangement of the support members can adapt to the arrangement requirement of the conductive part of the cell assembly, and the arrangement of the support members matches the arrangement of the conductive part. In addition, the arrangement of the first support member and the second support member can also realize the arrangement form in which all the conductive parts of the cell assemblies directly converge towards the middle position, which is beneficial to appropriately shorten the length of the conductive part, save the space occupied by the conductive part, reduce the redundancy of the conductive part, and facilitate the connection between the conductive part and the pole assembly.

[0014] In some embodiments, the battery cell satisfies condition A2, the middle position has a first side and a second side on two sides in the first shell wall width direction, the two ends of the support member abut against the conductive parts of different cell assemblies with the same polarity in the first shell wall width direction, one end of the support member extends into the opening slot of the bending segment on the first side, and the other end of the support member abuts against the conductive part of the cell assembly on the second side. In the technical solution, the two ends of the support member extend into different opening slots in the first shell wall width direction to abut against the conductive parts of different cell assemblies, which facilitates the support member to abut against the conductive parts of all cell assemblies, facilitates the dispersed arrangement of the conductive parts of all cell assemblies, and is beneficial to saving the number of support members and simplifying the structure of the battery cell.

[0015] In some embodiments, the two ends of the support member extend to the end of the support frame body in the first shell wall width direction and are arranged adjacent to the end of the support frame body, and the second through hole for the conductive part to pass through is defined between the two ends of the support member and the end of the support frame body. In the technical solution, the conductive part passes through the second through hole, and the end of the support member and the end of the support frame body can press and gather the conductive part respectively, limit the conductive part, facilitate the conductive part to maintain a predetermined gathering shape, and because the second through hole is located at the end of the support frame body, the second through hole is relatively close to the root position of the bending segment adjacent to the active material coating part, which is beneficial to making the root of the bending segment adjacent to the active material coating part more compact, and is beneficial to further reducing the probability of the bending segment spreading out.

[0016] In some embodiments, the support member comprises a first plate portion and two second plate portions, the two second plate portions are respectively arranged at two 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 are respectively inclinedly extended in directions away from each other and towards the support body. In this way, by arranging the two second plate portions to be inclinedly extended in directions away from each other and towards the support body, the distance between the second plate portions and the active material coating portion can be adapted to the space required by the two second gathering portions, so that the second plate portions can avoid the roots of the second gathering portions, while also pressing and limiting the positions of the roots of the second gathering portions.

[0017] In some embodiments, the insulating support further comprises a pressing member arranged opposite to and spaced apart from the support member, the conductive portion is arranged between the support member and the pressing member, and the pressing member presses the side of the conductive portion facing the active material coating portion. In this way, by arranging the pressing member, the conductive portion can be clamped between the support member and the pressing member, and the pressing member and the support member cooperate to gather the conductive portion, so as to further keep the conductive portion in a preset gathered and extended state, and the conductive portion is gathered more tightly, thereby further reducing the probability of the conductive portion being scattered. In particular, the conductive portion comprises a tab, the tab comprises a plurality of tab pieces stacked one on another, and the tab is arranged between the support member and the pressing member, so as to keep the shape of the tab and reduce the probability of the tab being scattered.

[0018] In some embodiments, the conductive portion comprises a bent segment, the bent segment is formed with an open slot, the support member corresponding to the pressing member extends into the open slot and abuts against the bent segment, and the pressing member abuts against the side of the bent segment away from the active material coating portion. In the above technical solution, the pressing member cooperates with the support member, the support member extends into the open slot, the pressing member abuts against the side of the bent segment away from the active material coating portion, and a part of the bent segment is limited between the support member and the pressing member, so that the pressing member and the support member cooperate to gather the bent segment, thereby further keeping the bent segment in a preset gathered and bent state, and the bent segment is gathered more tightly, thereby further reducing the probability of the bent segment being scattered.

[0019] In some embodiments, the support member and the support body are an integral piece, or the support member and the support body are separate pieces and are fixed by heat melting, clamping or gluing. In this way, the support member and the support body can be formed in a flexible manner, thereby facilitating adaptation to different requirements.

[0020] In some embodiments, the clamping structure is integrally formed on the first shell wall, or the clamping structure is fixedly connected to the first shell wall by welding. In this way, the connection mode of the clamping structure and the first shell wall is selected flexibly, thereby facilitating satisfaction of different actual requirements.

[0021] In some embodiments, the bracket body further has a partition portion, the partition portion is arranged around the first through hole, the 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. In this way, by arranging the partition portion on the bracket body between the first shell wall and the active material coating portion, the partition portion is arranged around the first through hole for the conductive portion to pass through, and the welding position of the pole assembly and the first shell wall is opposite to the partition portion, so that the partition portion separates the welding position from the active material coating portion. During the assembly process or use process of the battery monomer, the partition portion can receive welding slag at the welding position to prevent the welding slag from falling onto the active material coating portion, reduce the possibility of the welding slag piercing the active material coating portion, reduce the possibility of the welding slag piercing the pole piece and the isolation film, and improve the reliability of the battery monomer.

[0022] In some embodiments, the partition portion has an annular groove, and the groove is open on the side facing the welding position. In the above scheme, by arranging the annular groove on the partition portion open on the side facing the welding position, the welding slag can fall into the groove from the open side of the groove, and the groove wall can limit and guide the welding slag falling into it. At the same time, the arrangement of the groove is beneficial to improve the collection capacity of the partition portion for the welding slag, and is beneficial to further reduce the probability of the welding slag falling onto the active material coating portion and improve the reliability of the battery monomer.

[0023] In some embodiments, the partition portion includes a first portion and a second portion, the first portion is opposite to the welding position along the thickness direction of the first shell wall, and the second portion is bent and connected to one end of the first portion away from the center axis of the first through hole and extends towards the welding position.

[0024] In the above technical scheme, by arranging the partition portion to include a first portion and a second portion, the first portion is connected to one end of the second portion away from the welding position, which facilitates the processing of the partition portion and the forming of the groove.

[0025] In some embodiments, the partition portion is configured in a flat plate structure. In the above technical scheme, the partition portion has a simple structure and is easy to process.

[0026] In some embodiments, the first shell wall has a liquid injection hole formed therein, the bracket body has a liquid injection channel formed therein, the liquid injection channel penetrates through the bracket body towards a side surface of the bracket body facing the first shell wall to form a liquid inlet, the liquid inlet is opposite to the liquid injection hole, at least a portion of a side of the liquid injection channel facing the active material coating portion is closed, and a liquid outlet is formed in the peripheral wall of the liquid injection channel and / or a side wall of the liquid injection channel facing the active material coating portion, the liquid outlet is communicated with a space between the bracket body and the active material coating portion.

[0027] In the technical solution, the injection hole is arranged on the first shell wall, and the injection channel is arranged on the support body, so that the electrolyte is injected into the accommodation cavity through the injection hole and the injection channel. If the sealing structure at the injection hole is configured to open the injection hole, the electrolyte in the accommodation cavity can also be discharged through the injection hole and the injection channel. Moreover, the side of the injection channel facing the active material coating part is at least partially closed, so that the closed part of the side of the injection channel facing the active material coating part can block the electrolyte during the injection process, so that the electrolyte does not directly impact the active material coating part, which is beneficial to improve the use reliability of the battery monomer.

[0028] In some embodiments, the support body further comprises a support part and a connecting part, the thickness of the support part is greater than the thickness of the connecting part in the thickness direction of the first shell wall, so that the support part protrudes from the connecting part towards the active material coating part, the support part is n and is arranged at intervals along the length direction of the first shell wall, n is greater than or equal to 3 and is a positive integer, the connecting part is connected between the adjacent two support parts, and the support part abuts between the first shell wall and the active material coating part. The first perforation is formed on the connecting part.

[0029] In the technical solution, by arranging three or more support parts, and arranging the support parts to protrude from the connecting 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, improve the insulation between the first shell wall and the active material coating part, and facilitate to enhance the structural stability and dimensional stability of the battery monomer, reduce the risk of damage to the battery monomer, and facilitate to provide a clearance for the arrangement of the conductive part. In addition, the support body and the battery monomer have a suitable abutting area, which is not too large to easily affect the smoothness of the exhaust when the battery monomer is in thermal runaway, and the abutting area is not too small to easily damage the battery monomer, which is beneficial to improve the reliability of the battery monomer.

[0030] In some embodiments, at least one support part is formed with a weight reduction structure. In the technical solution, by arranging the weight reduction structure on the support part, the material consumption of the support body is saved, the weight of the support body is reduced, and the volume of the support body is saved, the occupation of the accommodation cavity by the insulating support is reduced, thereby the weight of the battery monomer is reduced, and the energy density of the battery monomer is improved.

[0031] In some embodiments, the weight-reducing structure comprises: a discharge channel extending along the length direction of the first shell wall to opposite sides of the portion of the corresponding support part protruding from the connecting part; and / or, a weight-reducing hole closed at both ends in the length direction of the first shell wall. In the above technical solution, by providing the weight-reducing structure comprising the discharge channel, the discharge channel can not only achieve lightweight design of the insulating support, but also achieve smooth pressure relief of the battery monomer, one thing with multiple uses; by providing the weight-reducing structure comprising the weight-reducing hole, the weight-reducing hole can not only achieve lightweight design of the insulating support, but also will not have a great impact on the supporting effect of the support part. In addition, the provision of the discharge channel can appropriately increase the width of the support part to some extent, for example, the width of the support part can be equal to the width of the connecting part, so as to facilitate the support part to support the entire battery assembly in the width direction.

[0032] In some embodiments, the weight-reducing structure comprises a plurality of discharge channels and a plurality of weight-reducing holes, and the discharge channels and the weight-reducing holes are alternately arranged in the width direction of the first shell wall.

[0033] In some embodiments, the weight-reducing structure comprises a plurality of discharge channels and a plurality of weight-reducing holes, and the discharge channels and the weight-reducing holes are alternately arranged in the width direction of the first shell wall.

[0034] In some embodiments, the support part is flush with the portion of the weight-reducing structure corresponding to the side of the discharge channel and the weight-reducing hole facing the active material coating part. In the above technical solution, by providing the support part flush with the portion of the weight-reducing structure corresponding to the side of the discharge channel and the weight-reducing hole facing the active material coating part, the support part can provide a larger and flat surface on the side facing the active material coating part, and the support part is not easily affected by the discharge channel and the weight-reducing hole to support the battery assembly, which is beneficial to improve the supporting effect of the support part on the battery assembly.

[0035] In some embodiments, the weight-reducing structure comprises a plurality of discharge channels and a plurality of weight-reducing holes, and the discharge channels and the weight-reducing holes are alternately arranged in the width direction of the first shell wall.

[0036] In the technical solution, the electrolyte on the side of the support part away from the active material coating part can flow to the side where the active material coating part is located through the communication hole to soak the active material coating part, so that the electrolyte in the accommodation cavity is fully utilized. Meanwhile, the communication hole is formed on the weight-reducing structure to fully utilize the space provided by the support part, which is beneficial to save the occupied space of the support part. In combination with the arrangement mode that the weight-reducing structure is closed on one side in the thickness direction of the first shell wall and the communication hole is formed on the closed side, the processing and forming of the weight-reducing structure and the communication hole are facilitated.

[0037] In some embodiments, the plurality of support parts include a first support part, a second support part and a third support part, the first support part and the second support part are respectively located at the two ends of the length of the support body, and the third support part is arranged between the first support part and the second support part. 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 a discharge channel and a communication hole, and each of the first support part and the second support part is formed with a discharge channel, a weight-reducing hole and a communication hole. Thus, on the premise that the first support part, the second support part and the third support part reliably support the battery cell assembly, the functions of the support parts are enriched, which is beneficial to improve the reliability of the battery monomer.

[0038] In some embodiments, the pole post assembly further includes an insulation structure, which is insulated and sealingly fitted between the clamping structure and the pole post body. In the technical solution, the pole post assembly has a simple structure and is easy to process. Since the pole post assembly includes the pole post body and the clamping structure, the shape and size of the pole post body and the shape and size of the clamping structure can be designed separately based on different factors to flexibly adapt to the connection requirements of different forms of shell assemblies and battery cell assemblies, thereby increasing the application range of the pole post assembly.

[0039] In some embodiments, the insulation structure includes a sealing member, which is arranged around the pole post body, and at least part of the sealing member is clamped between the clamping structure and the pole post body in the thickness direction of the first shell wall. Thus, by arranging at least part of the sealing member to be clamped between the clamping structure and the pole post body in the inner-outer direction of the first shell wall, axial sealing between the clamping structure and the pole post body is achieved. The axial sealing can achieve a more reliable sealing effect, thereby improving the leakage problem at the fitting position of the clamping structure and the pole post body. Moreover, the embodiments of the present application integrate the axial sealing, such as the shaft side part, into the pole post assembly, which can reduce the axial force acting on the first shell wall.

[0040] In some embodiments, the first shell wall has a mounting hole, the pole assembly cover is arranged on the mounting hole, and the outer periphery of the clamping structure is overlap-welded on one side of the portion of the first shell wall around the mounting hole in the first shell wall thickness direction. In this way, by arranging the clamping structure on one side of the first shell wall in the wall thickness direction, i.e., arranging the clamping structure on the outer side of the first shell wall or on the inner side of the first shell wall, the assembly of the clamping structure and the first shell wall is facilitated.

[0041] In some embodiments, the outer periphery of the clamping structure has a flange portion, the first shell wall has a sink formed around the mounting hole, and the flange portion is fitted into the sink. In this way, the connection of the clamping structure and the first shell wall is supported and positioned, and the two are favorably welded and connected from the outer side of the first shell wall, i.e., from the side away from the active material coating portion.

[0042] In some embodiments, the pole assembly surrounds a receiving groove that is recessed away from the battery cell assembly with respect to the first shell wall and is open toward the battery cell assembly, and at least part of the conductive portion is received in the receiving groove. In the above technical solution, the receiving groove is arranged to receive the conductive portion, so that the conductive portion occupies less space in the receiving cavity, the receiving cavity has more space to accommodate the active material coating portion, the volume of the active material coating portion is increased, and the energy density of the battery monomer is increased. Moreover, since the receiving groove is open toward the battery cell assembly, the conductive portion can easily extend into the receiving groove, reducing the difficulty of operation.

[0043] In some embodiments, the shell assembly includes a shell body and a shell cover, the shell body is an integral piece and has an open end, the shell cover is arranged at the open end of the shell body, and the end of the shell body opposite to the shell cover is the first shell wall; or the shell cover is the first shell wall. In the above technical solution, the shell assembly has a flexible structure design, and the pole assembly has a flexible arrangement position.

[0044] In some embodiments, the battery monomer further includes a pressure relief structure arranged on the shell assembly and located on the same side or different side of the pole assembly. In the above technical solution, when the pressure relief structure and the pole assembly are located on the same side, the design of other shell walls except the first shell wall can be simplified, and the structure and processing of the battery monomer are simplified. When the pressure relief structure and the pole assembly are located on different sides, the space occupied by the pressure relief structure on the first shell wall does not need to be considered, the volume of the pole assembly is reduced, and the shape and volume of the pole assembly can be flexibly designed as needed.

[0045] In a second aspect, the embodiments of the present application provide a battery device including the above-mentioned battery monomer.

[0046] In the above technical solution, the performance of the battery device can be improved by using the above-mentioned battery monomer.

[0047] In a third aspect, the embodiments of the present application provide a power consumption device including the above-mentioned battery device.

[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 This application provides structural schematic diagrams of vehicles for some embodiments;

[0051] Figure 2 Exploded views of batteries provided for some embodiments of this application;

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

[0053] Figure 4 for Figure 3 An exploded view of a single battery cell shown;

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

[0055] Figure 6 For along Figure 5 A cross-sectional view of the CC line;

[0056] Figure 7 for Figure 6 A cross-sectional view of the pole assembly shown;

[0057] Figure 8 A schematic diagram of a battery cell provided for other embodiments of this application;

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

[0059] Figure 10 For along Figure 9 Sectional view of the DD line;

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

[0061] Figure 12 For along Figure 11 Sectional view of the middle EE line;

[0062] Figure 13 An enlarged view of the A portion shown in the middle circle;

[0063] Figure 14 An enlarged view of the A portion shown in the middle circle; Figure 13

[0064] Figure 15 An enlarged view of the A portion shown in the middle circle; Figure 13

[0065] Figure 16 An enlarged view of the A portion shown in the middle circle; Figure 13

[0066] Figure 17 An enlarged view of the A portion shown in the middle circle; Figure 13

[0067] Figure 18 An enlarged view of the A portion shown in the middle circle; Figure 13

[0068] Figure 19 A sectional view along the B-B line shown in the middle circle; Figure 16

[0069] Figure 20 An assembly view of the first shell wall, the pole assembly and the insulating support provided in some embodiments of the present application;

[0070] Figure 21 An assembly view of the first shell wall, the pole assembly and the insulating support provided in some embodiments of the present application; Figure 20

[0071] An assembly view of the first shell wall, the pole assembly and the insulating support provided in some embodiments of the present application; Figure 22 Figure 20 An assembly view of the first shell wall, the pole assembly and the insulating support provided in some embodiments of the present application;

[0072] Figure 23 Figure 20 An assembly view of the first shell wall, the pole assembly, the insulating support and the adapter provided in some embodiments of the present application;

[0073] Figure 24 An assembly view of the first shell wall, the pole assembly, the insulating support and the adapter provided in some embodiments of the present application; Figure 23

[0074] An assembly view of the first shell wall, the pole assembly, the insulating support, the adapter and the support provided in some embodiments of the present application; Figure 25 Figure 23 An assembly view of the first shell wall, the pole assembly, the insulating support, the adapter and the support provided in some embodiments of the present application;

[0075] Figure 26 An assembly view of the first shell wall, the pole assembly, the insulating support, the adapter and the support provided in some embodiments of the present application; Figure 25 ​​​​​​​​​schematic view of the support shown in Fig. 1;

[0076] Figure 27 For Figure 26 another schematic view of the support shown in Fig. 1.

[0077] Reference signs:

[0078] battery cell 100, battery device 200, controller 300, motor 400, electric device 500, case 101, first case portion 1011, second case portion 1012, welding position R1, middle position R2,

[0079] housing assembly 1, accommodating cavity 10, first housing wall 11, mounting hole 111, sink 112, liquid injection hole 113, housing body 12, opening 121, housing cover 13, pole post assembly 2, accommodating groove 20, pole post body 21, clamping structure 22, flange portion 22a, first adapter ring 221, second adapter ring 222, insulation frame 223, insulation structure 23, sealing member 231, shaft side portion 231a, electric core assembly 3, active material coating portion 31, conductive portion 32, first gathering portion 32a, second gathering portion 32b, bending segment 321, opening groove 321a, first extension segment 3211, second extension segment 3212, transition segment 3213, tab 322, adapter 323, first segment 324, second segment 325, insulation bracket 4, second through hole 40, bracket body 41, first through hole 411, partition portion 412, recess 412a, first portion 4121, second portion 4122, liquid injection channel 413, liquid inlet 413a, liquid outlet 413b, support portion 414, first support portion 4141, second support portion 4142, third support portion 4143, weight reduction structure 4144, discharge channel 4144a, weight reduction hole 4144b, communication hole 4145, connecting portion 415, support 421, buckle 4210, first plate portion 4211, second plate portion 4212, pressing member 422, pressure relief structure 5. DETAILED DESCRIPTION

[0080] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application. If not specifically described, all the embodiments and optional embodiments of the present application can be combined to form new technical solutions. If not specifically described, all the technical features and optional technical features of the present application can be combined to form new technical solutions.

[0081] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms used in disclosing the application, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms used in the description of the present application are used for illustrative purposes only and are not intended to limit the scope of the application. The summary of the application and its teachings do not purport to be exhaustive or to be limited to a single embodiment, as the specialty of the application and its industrial applicability are best understood by practicing the application. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The use of the terms "including," "comprising," or "having" and variations thereof in the specification and claims are intended to cover both the inclusive and exclusive cases. The use of the terms "first," "second," and the like in the specification and claims is intended to indicate different features, and is not intended to imply a particular order or sequence.

[0082] Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments.

[0083] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood in a broad sense, for example, it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0084] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0085] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings are only exemplary and should not constitute any limitation on the present application. "Multiple" appearing in the present application means two or more (including two).

[0086] In the present application, the battery cell can include a lithium ion secondary battery (a secondary battery refers to a battery cell that can be activated by charging after discharging the battery cell), a lithium ion primary battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., and the present application embodiment is not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc., and the present application embodiment is not limited thereto. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the present application embodiment is not limited thereto.

[0087] Exemplarily, the battery cell can generally include a shell, an electrode assembly, and an electrolyte, the shell is used to accommodate the electrode assembly and the electrolyte, and the shell is provided with at least one positive pole and at least one negative pole. The electrode assembly is one or more, and the electrode assembly is formed by stacking or winding the positive pole sheet, the negative pole sheet, and the separator film.

[0088] Among them, the positive pole sheet can generally include 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 tab sheet, and a plurality of positive tab sheets are stacked together and electrically connected with the positive pole. Exemplarily, the plurality of positive tab sheets stacked together can be directly welded to the positive pole to form an electrical connection; or the electrode assembly can also include a positive adapter sheet, the plurality of positive tab sheets stacked together are welded to one end of the positive adapter sheet, and the other end of the positive adapter sheet is welded to the positive pole, so that the positive tab sheet and the positive pole form an electrical connection.

[0089] The negative pole sheet can generally include 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 tab sheet, and a plurality of negative tab sheets are stacked together and electrically connected with the negative pole. Exemplarily, the plurality of negative tab sheets stacked together can be directly welded to the negative pole to form an electrical connection; or the electrode assembly can also include a negative adapter sheet, the plurality of negative tab sheets stacked together are welded to one end of the negative adapter sheet, and the other end of the negative adapter sheet is welded to the negative pole, so that the negative tab sheet and the negative pole form an electrical connection. The material of the separator film is not limited, for example, it can be polypropylene or polyethylene, etc.

[0090] The pressure relief structure on the battery cell mentioned in the present application is used to release the gas inside the battery cell to reduce the internal pressure of the battery cell when the internal pressure of the battery cell is too high (for example, caused by overcharging, etc.), to prevent the battery cell from exploding due to too fast internal pressure increase, etc. For example, the pressure relief structure can be an explosion-proof valve, an explosion-proof sheet, etc.; the pressure relief structure can be an integral part of the shell of the battery cell or a separate part.

[0091] The battery device (BatteR1y AppaR1atus) mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (BatteR1y Cell Assembly) can include a plurality of battery cells connected in series, parallel or mixed connection through a busbar component.

[0092] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells. As an example, the battery cell assembly can be a battery module (BatteR1y Module) formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0093] In some embodiments, the battery device can be a battery pack (batteR1y Pack) including a box and one or more battery cell assemblies accommodated in the box. Of course, the battery device can also not include a box.

[0094] As an example, the battery cell assembly can be a battery module, which can be accommodated in the box by fixing the battery module in the box. As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0095] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, batteries play an irreplaceable important role as the power source of electric vehicles. Among them, batteries as core components of new energy vehicles have high demand in terms of reliability.

[0096] In the related art, the cell assembly of the battery cell is easily pierced by particulate matter, affecting the normal operation of the battery cell; for example, the pole assembly of the battery cell is usually fixed to the shell assembly by welding, and the welding slag generated by welding the pole assembly and the shell assembly is easy to fall on the cell assembly, affecting the normal use of the cell assembly.

[0097] Based on the above considerations, in order to inhibit the heat diffusion of the battery, a battery monomer is provided, comprising a shell assembly, a pole assembly, a cell assembly and an insulating support, the shell assembly has a receiving cavity and comprises a first shell wall participating in enclosing the receiving cavity, the pole assembly comprises a pole body and a clamping structure, the clamping structure clamps the pole body, and the clamping structure is connected with the first shell wall, the cell assembly is accommodated in the receiving cavity and comprises an active material coating part and a conductive part, the conductive part connects the active material coating part and the pole body, the insulating support is arranged between the active material coating part and the first shell wall, the insulating support comprises a support body and a support piece, the support body has a first through hole, the conductive part is arranged in the first through hole, and the support piece supports one side of the conductive part facing the active material coating part.

[0098] In the above technical solution, by arranging the support piece on the support body, the support piece can support the conductive part, so that the conductive part can maintain a predetermined form, and the form and position of the conductive part can be controlled, and the support piece can also block a part of the conductive part and 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, and improve the reliability of the battery monomer.

[0099] The battery monomer or the battery device of the present disclosure can be used as a power supply for an electric device. The electric device can be, but is not limited to, a mobile phone, a portable device, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc. The electric tool can include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, such as a power drill, a power grinder, a power wrench, a power screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc.

[0100] The following embodiments take the electric device 700 as a vehicle for example to introduce the structure of the electric device 700, the battery device 200 and the battery monomer 100 in detail.

[0101] Please refer to Figure 1 , Figure 1The power utilization device 700 provided in some embodiments of the present application is a structural schematic diagram of a vehicle. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle is provided with a battery device 200, which can be arranged at the bottom, head or tail of the vehicle. The battery device 200 can be used for power supply of the vehicle, for example, the battery device 200 can be used as an operating power source of the vehicle. The vehicle can further include a controller 300 and a motor 400, and the controller 300 is used to control the battery device 200 to supply power to the motor 400, for example, to meet the power demand of the vehicle during starting, navigation and driving. In some embodiments of the present application, the battery device 200 can not only be used as an operating power source of the vehicle, but also be used as a driving power source of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0102] In some embodiments, the box 101 of the battery device 200 can be part of the chassis structure of the vehicle. For example, part of the box 101 can become at least part of the floor of the vehicle, or part of the box 101 can become at least part of the cross beam and longitudinal beam of the vehicle.

[0103] Please refer to Figure 2 , Figure 2 The battery cell 100 provided in some embodiments of the present application is a structural explosion diagram of the battery device 200. The battery device 200 includes a box 101 and a plurality of battery cells 100, and the battery cells 100 are accommodated in the box 101. Among them, the box 101 is used to provide an assembly space for the battery cells 100, and the box 101 can adopt various structures. In some embodiments, the box 101 can include a first box 1011 and a second box 1012, the first box 1011 and the second box 1012 are overlapped with each other, and the first box 1011 and the second box 1012 jointly define an accommodation cavity for accommodating the battery cells 100; at this time, a closed space is formed inside the box 101 to accommodate the battery cells 100, and the closed here means covered or closed, which can be sealed or unsealed. The second box 1012 can be a hollow structure with one end open, and the first box 1011 can be a plate structure, which is overlapped with the open side of the second box 1012 to jointly define the accommodation cavity with the second box 1012; or, the first box 1011 and the second box 1012 can also be hollow structures with one side open (for example, as shown in the figure), and the open side of the first box 1011 is overlapped with the open side of the second box 1012. Of course, the box 101 formed by the first box 1011 and the second box 1012 can have various shapes, such as a cylinder, a cuboid, etc. Figure 2

[0104] ​As an example, the box 101 can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively, so that an enclosed space is formed inside the box 101 to accommodate the battery cell 100; the first box 1011 can be the top cover or the bottom plate.

[0105] In the battery device 200, the plurality of battery cells 100 can be connected in series, in parallel or in a mixed manner, where the mixed manner means that the plurality of battery cells 100 are connected in series and in parallel. The plurality of battery cells 100 can be directly connected in series, in parallel or in a mixed manner, and then the plurality of battery cells 100 are accommodated in the box 101; or the battery device 200 can also be that the plurality of battery cells 100 are connected in series, in parallel or in a mixed manner to form a battery module, and then the plurality of battery modules are connected in series, in parallel or in a mixed manner to form an integral whole and are accommodated in the box 101. The battery device 200 can also include other structures, for example, the battery device 200 can also include a busbar for realizing electrical connection between the plurality of battery cells 100.

[0106] Please refer to Figure 3 , Figure 3 The structure of the battery cell provided in some embodiments of the present application is shown in the figure. The battery cell 100 is a cuboid, and the height direction of the battery cell 100 is the third direction Z, the length direction of the battery cell 100 is the second direction Y, and the thickness direction of the battery cell is the first direction X. The first direction X, the second direction Y and the third direction Z are perpendicular to each other; but not limited to this, in other embodiments of the present application, the battery cell 100 can also be a multi-prism, a flat body or other shapes, etc.

[0107] In the following description of the present 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, and other embodiments can be easily understood by those skilled in the art after reading the following description.

[0108] Please refer to Figures 3-4 In the embodiments of the present application, the battery cell 100 includes a shell assembly 1, a pole assembly 2 and a cell assembly 3.

[0109] Exemplarily, the shell assembly 1 comprises a shell body 12 and a shell cover 13, the shell cover 13 covers the opening of the shell body 12 to insulate the internal environment of the battery monomer 100 from the external environment. Without limitation, the shape of the shell cover 13 can be adapted to the shape of the shell body 12 to fit the shell body 12. Optionally, the shell cover 13 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the shell cover 13 is not easy to deform when subjected to extrusion collision, so that the battery monomer 100 can have higher structural strength, and the reliability can also be improved. The pole post assembly 2 can be provided on the shell body 12 or the shell cover 13, and the pole post assembly 2 can be used to output or input the electric energy of the battery monomer 100. The shell body 12 is used to fit the shell cover 13 to form the internal environment of the battery monomer 100, wherein the formed internal environment can be used to accommodate the cell assembly 3, the electrolyte and other components. The shell body 12 and the shell cover 13 can be independent components, an opening 121 can be provided on the shell body 12, the internal environment of the battery monomer 100 can be formed by covering the opening with the shell cover 13, or the shell cover 13 and the shell body 12 can be integrated, specifically, the shell cover 13 and the shell body 12 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the inside of the shell body 12, the shell cover 13 covers the shell body 12.

[0110] In the embodiment of the present application, the shell assembly 1 has a receiving cavity 10, and the shell assembly 1 comprises a first shell wall 11 which participates in surrounding the receiving cavity 10; exemplarily, the pole post assembly 2 is mounted on the first shell wall 11, the first shell wall 11 has a mounting hole 111, and the pole post assembly 2 is arranged at the mounting hole 111, and the welding position R1 between the pole post assembly 2 and the first shell wall 11 is located at the hole wall position of the mounting hole 111. Wherein, "the pole post assembly 2 is mounted on the first shell wall 11" means that the pole post assembly 2 and the first shell wall 11 have an assembly connection relationship, for example, can be welded or riveted, etc. Thus, the shell assembly 1 and the pole post assembly 2 are respectively separate components, and the two are assembled and connected, so that the shell assembly 1 and the pole post assembly 2 can be separately processed, facilitating the processing of the two, and facilitating the processing and manufacturing of the battery monomer 100. Of course, in other examples, part of the shell assembly 1 and part of the pole post assembly 2 can also be an integral molded part.

[0111] The pole post assembly 2 comprises a pole post body 21 and a clamping structure 22, the clamping structure 22 clamps the pole post body 21, and the clamping structure 22 is connected with the first shell wall 11, so that the pole post body 21 is connected with the first shell wall 11 through the clamping structure 22 to realize the installation of the pole post body 21; exemplarily, the clamping structure 22 can surround the pole post body 21 along the circumference of the mounting hole 111 on the first shell wall 11, and the clamping structure 22 can connect the pole post body 21 and the first shell wall 11 at the outer peripheral region of the pole post body 21.

[0112] The battery monomer 100 comprises a first shell wall 11 and a second shell wall 12, and the first shell wall 11 and the second shell wall 12 are connected to form a receiving cavity 10. The battery monomer 100 further comprises an electrode core assembly 3 accommodated in the receiving cavity 10. The electrode core assembly 3 can be one or more, and the electrode core assembly 3 comprises an active material coated portion 31 and a conductive portion 32. The conductive portion 32 is connected to the active material coated portion 31 and the pole body 21, and realizes input or output of electric energy of the battery monomer 100. The electrode core assembly 3 comprises a positive electrode sheet, a negative electrode sheet and a separator, the separator is arranged between the positive electrode sheet and the negative electrode sheet, the positive electrode sheet and the negative electrode sheet have portions with active material, which are respectively the active material coated portion 31, and portions without active material of the positive electrode sheet and the negative electrode sheet respectively constitute a tab, and the conductive portion 32 comprises the tab. In the embodiment of the present application, the connection mode between the pole body 21 and the conductive portion 32 is not specifically limited, for example, the pole body 21 and the conductive portion 32 can be welded or riveted.

[0113] Please refer to Figure 4 、 Figure 6 、 Figure 10 and Figure 12 In the embodiment of the present application, the battery monomer 100 further comprises an insulating support 4, the insulating support 4 is accommodated in the receiving cavity 10, and the insulating support 4 is arranged on the side of the active material coated portion 31 facing the first shell wall 11. The insulating support 4 is used to support the electrode core assembly 3, and the active material coated portion 31 is separated from the first shell wall 11 by the insulating support 4, so as to reduce the probability of contact between the active material coated portion 31 and the first shell wall 11, thereby reducing the risk of corrosion of the first shell wall 11 caused by exposure of the active material coated portion 31, reducing the risk of liquid leakage, and improving the reliability and stability of the battery monomer 100. It can be seen that the insulating support 4 is arranged between the active material coated portion 31 and the first shell wall 11.

[0114] The insulating support 4 comprises a support body 41, the support body 41 has a first through hole 411, and the conductive portion 32 is arranged in the first through hole 411, so that the conductive portion 32 can extend from the side of the support body 41 away from the first shell wall 11 to the side of the support body 41 facing the first shell wall 11 through the first through hole 411 to be electrically connected with the pole body 21. The support body 41 further has a supporting piece 421, and the supporting piece 421 supports the side of the conductive portion 32 facing the active material coated portion 31.

[0115] It can be seen that the support member 421 can support the conductive part 32, to some extent, can separate the conductive part 32 from the active material coating part 31, and the support member 421 can prevent the conductive part 32 from moving towards the direction close to the active material coating part 31, for example, when the conductive part 32 is subjected to an external force so that the conductive part 32 has a tendency to move towards the active material coating part 31, the support member 421 can exert a counter force on the conductive part 32 to hinder the movement tendency of the conductive part 32 towards the active material coating part 31, thereby reducing the risk of the conductive part 32 moving towards the active material coating part 31 to cause short circuit due to the reverse insertion of the active material coating part 31, and facilitating to improve the reliability of the battery monomer 100.

[0116] In the above technical solution, the support member 421 can support the conductive part 32, so as to facilitate the conductive part 32 to maintain a predetermined form, and facilitate the form and position of the conductive part 32 to be controllable, and the support member 421 can also block between a part of the conductive part 32 and the active material coating part 31, so as to reduce the probability of the conductive part 32 being reversely inserted into the active material coating part 31 due to redundancy, and improve the reliability of the battery monomer 100.

[0117] Please refer to Figure 12 , Figure 23 and Figure 25 In some embodiments, the support member 421 supports the part of the conductive part 32 penetrating the first perforation 411, for example, at least part of the support member 421 is located on the side of the first perforation 411 facing the active material coating part 31; or, the conductive part 32 includes a first segment 324 and a second segment 325, the first segment 324 is connected between the active material coating part 31 and the second segment 325, the second segment 325 penetrates the first perforation 411, and the support member 421 supports the first segment 324.

[0118] Therefore, the specific position of the support member 421 supporting the conductive part 32 has certain setting flexibility, and the support setting of the support member 421 and the penetrating arrangement of the conductive part 32 penetrating the first perforation 411 do not easily interfere with each other, facilitating the convenient assembly of the battery monomer 100.

[0119] It can be understood that when the conductive part 32 includes the tab 322 and does not include the adapter 323, the tab 322 includes the first segment 324 and the second segment 325; when the conductive part 32 includes the tab 322 and the adapter 323, the first segment 324 and the second segment 325 can be part of the tab 322, or the first segment 324 and the second segment 325 are part of the adapter 325, or the first segment 324 is part of the tab 322 and the second segment 325 is part of the adapter 323 (as shown in FIG. 4B). Figure 12The first section 324 is a part of the tab 322, and the second section 325 includes a part of the tab 322 and a part of the adapter 323, but is not limited thereto.

[0120] Please refer to Figure 6 、 Figure 10 and Figure 12 In some embodiments, the conductive part 32 includes a bent section 321 formed with an open slot 321a. Exemplarily, the bent section 321 can 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 can be oppositely arranged along the thickness direction of the first shell wall. The transition section 3213 is bently connected between the first extension section 3211 and the second extension section 3212. The first extension section 3211 and the second extension section 3212 are spaced apart from each other at the ends away from the transition section 3213 to define a slot opening of the open slot 321a.

[0121] As shown in Figure 10 and Figure 12 , the slot opening of the open slot 321a is arranged towards the side where the support 421 is located. The support 421 extends into the open slot 321a and abuts against the bent section 321. This facilitates the support 421 to support and / or press against the bent section 321, so that the bent section 321 can maintain a predetermined bent shape. This is conducive to controlling the bent shape of the conductive part 32 and the position of the bent section 321. In addition, the support 421 can block a part of the bent section 321 and the active material coating part 31, so as to reduce the probability of the conductive part 32 being inserted into the active material coating part 31 due to redundancy, reduce the risk of short circuit of the battery monomer 100, and improve the use reliability of the battery monomer 100. Exemplarily, the bent section 321 includes the first extension section 3211, the second extension section 3212, and the 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 part 31. The support 421 extends into the open slot 321a to support the first extension section 3211 and / or press against the second extension section 3212.

[0122] There are also some examples, such as Figure 6As shown, the opening groove 321a is arranged on the side away from the support piece 421, and the support piece 421 is abutted on the side of the bending section 321 facing the active material coating part 31, so that the support piece 421 can also support the bending section 321, so as to keep the bending section 321 in a preset bending shape, and the bending shape of the conductive part 32 and the position of the bending section 321 can be controlled, and the support piece 421 can also block between the bending section 321 and the active material coating part 31, so as to reduce the probability of the bending section 321 being inserted into the active material coating part, and improve the 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 away from the active material coating part 31, the opening groove 321a is arranged on the side away from the support piece 421, and the support piece 421 is abutted on the side of the second extension section 3212 and / or the transition section 3213 facing the active material coating part 31.

[0123] It can be understood that in the embodiments of the present application, the support piece 421 can extend horizontally, obliquely or bent, so as to match the bending section 321. In addition, the bending section 321 can be one or more, and the opening groove 321a can be one or more, and the support piece 421 can correspond to one of the opening grooves 321a.

[0124] Please refer to Figure 4 、 Figure 6 、 Figure 10 、 Figure 12 and Figure 13 In some embodiments, the support piece 421 is cantilevered, and the fixed end of the support piece 421 is connected to the hole wall of the first through hole 411, and the free end of the support piece 421 is abutted with the bending section 321. It can be seen that the support piece 421 supports the bending section 321, and at the same time, the support piece 421 has a certain deformation ability, so that the support piece 421 can be deformed according to the position and shape of the bending section 321, and the adaptability of the support piece 421 to the bending section 321 is improved. At the same time, if the bending section 321 is arranged adjacent to the active material coating part 31, the support piece 421 can press the root of the bending section 321 adjacent to the active material coating part 31, so that the conductive part 32 can keep a preset gathering shape without spreading.

[0125] 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 groove 321a has its groove opening facing away from the support member 421, and the free end of the support member 421 can abut against a side of the bent section 321 away from the inner wall surface of the opening groove 321a. In addition, in the above scheme, the support member 421 is arranged in a manner facilitating the support member 421 to be integrally formed on the support body 41. Of course, the above arrangement of the support member 421 can also be achieved by connecting the support member 421 to the support body 41 through assembly means.

[0126] Exemplarily, as shown in Figure 10 , the support member 421 is cantilevered, and the conductive parts 32 of all the battery cell assemblies 3 converge and are connected, and 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 be abutted and matched with the bent section 321 by extending into the opening groove 321a. In some examples, as shown in Figure 6 , the support member 421 is cantilevered, and the conductive parts 32 of a part of all the battery cell assemblies 3 converge and are connected, and the support member 421 abuts against the conductive parts 32 of the part of all the battery cell assemblies 3. At this time, the support member 421 can be abutted and matched with the bent section 321 by facing away from the groove opening of the opening groove 321a.

[0127] Please refer to Figure 12 , in some embodiments, the support member 421 is located on the side of the support body facing the active material coated part 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 extending into different conductive parts 32. Similarly, it is also convenient to make the support member 421 conform to the position and shape of the bent section 321, improve the adaptability of the support member 421 to the bent section 321, and at the same time, the support member 421 can support multiple conductive parts 32, facilitating the flexible arrangement of the internal structure of the battery monomer 100.

[0128] Please refer to Figure 6 , Figure 10 and Figure 12 , in some embodiments, the battery cell assembly 3 is multiple, and the multiple battery cell assemblies 3 are arranged in sequence along the width direction of the first shell wall 11, and the battery monomer 100 is configured to satisfy any one of the following conditions A1~A2:

[0129] Condition A1, the same polarity conductive parts 32 of all the battery cell assemblies 3 converge and are connected to form a first converging part 32a, and the first converging part 32a forms a bent section 321. At this time, the support member 421 can abut against the conductive parts 32 of all the battery cell assemblies 3, facilitating the converging arrangement of the conductive parts 32 of all the battery cell assemblies 3, and being conducive to saving the number of support members 421 and simplifying the structure of the battery monomer.

[0130] It is understandable that when the battery cell 100 meets condition A1, the support member 421 can also prevent the bending segment 321 from bending in the following ways: Method 1, such as... Figure 10 As shown, the opening of the groove 321a is provided facing the side where the support member 421 is located, and the support member 421 extends into the opening groove 321a; in the second method, the opening of the groove 321a is provided facing away from the side where the support member 421 is located, and the support member 421 abuts against the side of the bent section 321 facing the active material coating part 31.

[0131] 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.

[0132] Optionally, when the battery cell 100 meets condition A2, the support member 421 can also prevent the bending segment 321 from bending in the following ways: Method 1, such as... Figure 6 As shown, the opening of the slot 321a is positioned away from the side where the support member 421 is located. The conductive portions 32 of the battery cell assembly 3 located on the first side converge and connect to form a second gathering portion 32b. A portion of the bent section 321 of the second gathering portion 32b can extend to the second side, and the support member 421 located on the second side abuts against the bent section 321; Method 2, as shown Figure 12 As shown, the opening of the slot 321a is provided facing the side where the support member 421 is located. The conductive parts 32 of the battery cell assembly 3 located on the first side converge and connect to form a second gathering part 32b. The bent section 321 of the second gathering part 32b is located on the first side. The support member 421 extends into the opening slot 321a to stop the bent section 321.

[0133] 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.

[0134] Please refer 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 first shell wall 11 in the width direction of the first shell wall 11, the support 421 is multiple, and the multiple supports 421 include a first support and a second support arranged at intervals in the length direction of the first shell wall 11 (as shown in the middle of the first support and the second support 421 can be understood as) Figure 6 The first support and the second support respectively abut the conductive part 32 of the same polarity of different cell assembly 3, the first support is located at the first side, and the second support is located at the second side. Among them, a part of the bending section 321 corresponding to the cell assembly 3 located at the first side extends to the second side of the middle position, and the second support abuts on the side of the bending section 321 corresponding to the cell assembly 3 located at the first side towards the active material coating part 31, a part of the bending section 321 corresponding to the cell assembly 3 located at the second side extends to the first side of the middle position R2, and the first support abuts on the side of the bending section 321 corresponding to the cell assembly 3 located at the second side towards the active material coating part 31. Obviously, the first support can be arranged back to the slot corresponding to the opening slot 321a, and the second support can be arranged back to the slot corresponding to the opening slot 321a.

[0135] Exemplarily, taking the cell assembly 3 as two, the first shell wall 11 width direction as left and right direction as an example, the first support is located at the left side, and the second support is located at the right side. A part of the bending section 321 of the left side cell assembly 3 extends to the right side of the middle position R2, the second support abuts on the side of the bending section 321 of the left side cell assembly 3 towards the active material coating part 31, and the first support abuts on the side of the bending section 321 of the right side cell assembly 3 towards the active material coating part 31.

[0136] In the above technical solution, by arranging the first support and the second support which are opposite in the width direction of the first shell wall 11 and staggered in the length direction of the first shell wall 11, the first support abuts the conductive part 32 of the cell assembly 3 located on one side of the middle position R2, and the second support abuts the conductive part 32 of the cell assembly 3 located on the other side of the middle position R2, so that the arrangement of the above support 421 can adapt to the arrangement requirement of the conductive part 32 of the cell assembly 3 under the premise that the support 421 can play the role of supporting and / or pressing the conductive part 32, so that the arrangement of the support 421 matches the arrangement of the conductive part 32. In addition, the arrangement of the first support and the second support can also realize the arrangement form that all the conductive parts 32 of the cell assembly 3 directly converge 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 between the conductive part 32 and the pole assembly 2.

[0137] Please refer to Figure 12 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 in the first shell wall width direction, the support piece 421 has two ends in the first shell wall width direction, and the two ends abut against the conductive parts 32 of the same polarity of different cell assemblies, one end of the support piece 421 extends into the opening slot 321a of the bending section 321 located on the first side, and the other end of the support piece 421 extends into the opening slot 321a of the bending section 321 located on the second side.

[0138] For example, taking the cell assembly 3 as two and the first shell wall 11 width direction as left and right direction as an example, the left side of the bending section 321 of the left side cell assembly 3 is located at the middle position R2, the left end of the support piece 421 extends into the opening slot 321a of the left side bending section 321, the right end of the support piece 421 extends into the opening slot 321a of the right side bending section 321, the left side bending section 321 is formed on the second gathering part 32b of the left side cell assembly 3, and the right side bending section 321 is formed on the second gathering part 32b of the right side cell assembly.

[0139] In the above technical solution, by setting the two ends of the support piece 421 to extend into different opening slots 321a in the first shell wall width direction, the conductive parts 32 of different cell assemblies 3 are abutted, which facilitates the support piece 421 to abut against the conductive parts 32 of all cell assemblies 3, facilitates the dispersed arrangement of the conductive parts 32 of all cell assemblies 3, and is beneficial to save the number of support pieces 421 and simplify the structure of the battery cell 100.

[0140] Please refer to Figure 12 In some embodiments, the two ends of the support piece 421 in the first shell wall 11 width direction extend to the end of the support body 41 and are arranged adjacent to the end of the support body 41, and the two ends of the support piece 421 and the end of the support body 41 define a second through hole 40 for the conductive part 42 to pass through.

[0141] In the above technical solution, the conductive part 32 passes through the second through hole 40, and the end of the support piece 421 and the end of the support body 41 can press and gather the conductive part 32 respectively, limit the conductive part 32, facilitate the conductive part 32 to maintain a predetermined gathering form, and because the second through hole 40 is located at the end of the support body 41, the second through hole 40 is relatively adjacent to the root position of the bending section 321 adjacent to the active material coating part 41, which is beneficial to make the root of the bending section 321 adjacent to the active material coating part 41 more compact, and facilitate to further reduce the probability of the bending section 321 to spread out.

[0142] Please refer to Figure 12 and Figures 20-27In some embodiments, the support 421 includes a first plate portion 4211 and two second plate portions 4212 respectively arranged at two ends of the first plate portion 4211, each of the second plate portions 4212 defines a second through hole 40 with the support body 41, and the two second plate portions 4212 are respectively inclined to extend towards the support body 41 in directions away from each other, so that each of the second plate portions 4212 is inclined to extend towards the support body 41 in a direction away from the other second plate portion 4212, and the distance between the second plate portion 4212 and the active material coated portion 32 increases in a direction away from the middle portion of the first shell wall 11.

[0143] In the above scheme, the two second plate portions 4212 are respectively inclined to extend towards the support body 41 in directions away from each other, so that the distance between the second plate portion 4212 and the active material coated portion 31 can adapt to the space required by the second converging portion 32b on both sides, so that the second plate portion 4212 can avoid the root of the second converging portion 32b, and at the same time, the second plate portion 4212 can press and limit the position of the root of the second converging portion 32b.

[0144] Please refer to Figure 10 In some embodiments, the insulating support 4 further includes a pressing member 422 arranged opposite to and spaced apart from the support 421, the conductive portion 32 is arranged between the support 421 and the pressing member 422, and the pressing member 422 presses the side of the conductive portion 32 facing the active material coated portion 31.

[0145] It can be seen that, by arranging the pressing member 422, the conductive portion 32 is arranged between the support 421 and the pressing member 422, and the pressing member 422 and the support 421 cooperate to converge the conductive portion 32, so as to further maintain the preset converging and extending shape of the conductive portion 32, and the conductive portion 32 is more compact, thereby further reducing the probability of the conductive portion 32 being scattered. Especially, the conductive portion 32 includes the tab 322, the tab 322 includes a plurality of tab pieces arranged in layers, and the tab 322 is arranged between the support 421 and the pressing member 422, so as to maintain the shape of the tab 322 and reduce the probability of the tab 322 being scattered.

[0146] Please refer to Figure 10 In some embodiments, the conductive portion 32 includes a bent segment 321, the bent segment 321 is formed with an open slot 321a, the support 421 corresponding to the pressing member 422 extends into the open slot 321a, and the support 421 corresponding to the pressing member 422 abuts against the bent segment 321, and the pressing member 422 abuts against the side of the bent segment 321 away from the active material coated portion 31.

[0147] In the technical solution, the pressing part 422 cooperates with the supporting part 421, the supporting part 421 extends into the opening groove 321a, and the supporting part 421 is arranged on the side of the bending section 321 away from the active material coating part 31, so that a part of the bending section 321 is limited between the supporting part 421 and the pressing part 422. The pressing part 422 and the supporting part 421 cooperate to gather the bending section 321, so as to further make the bending section 321 maintain the preset gathered and bent shape, and the bending section 321 is gathered more tightly, thereby further reducing the probability of the bending section 321 being scattered. It can be understood that in the embodiment of the present application, the pressing part 422 can extend horizontally, obliquely or bent, so as to match the bending section 321.

[0148] Please refer to Figure 6 , Figure 10 and Figure 13 In some embodiments, the support body 41 and the supporting part 421 are integrated, which is convenient for saving the assembly process of the support body 41 and the supporting part 421, and is conducive to improving the assembly efficiency of the battery monomer 100, and is convenient for realizing reliable connection of the support body 41 and the supporting part 421. Alternatively, please refer to Figure 12 and Figures 23-27 In some embodiments, the support body 41 and the supporting part 421 are separate parts, and are fixed by heat melting, clamping or gluing, which is convenient for improving the flexibility of the structure design of the two parts. Exemplarily, the supporting part 421 is formed with a buckle 4210, and the support body 41 is formed with a clamping hole, and the buckle 4210 is clamped in the clamping hole.

[0149] It can be understood that in any embodiment of the present application, the conductive part 32 can adopt any of the following forms: form one, the conductive part 32 includes a tab and an adapter, the tab is connected to one end of the active material coating part 31 facing the first shell wall 11, and the tab includes a plurality of tab pieces stacked, and the adapter is connected between the tab and the pole body 21, and if the conductive part 32 is formed with a bending section 321, the bending section 321 can be defined by the tab and / or the adapter; form two, the conductive part 32 includes a tab and does not include an adapter, the tab is connected to one end of the active material coating part 31 facing the first shell wall 11 and the pole body 21, and if the conductive part 32 is formed with a bending section 321, the bending section 321 can be defined by the tab.

[0150] In some embodiments, the support body 41 and the pressing part 422 are integrated or separate parts; when the support body 41 and the pressing part 422 are separate parts, the two parts are fixed by heat melting, clamping or gluing.

[0151] In some embodiments, as shown in Figure 8 The clamping structure 22 is integrally formed on the first shell wall 11; or as shown in Figure 6 , Figure 10and Figure 12 As shown, the clamping structure 22 is welded and fixed with the first shell wall 11. In this way, the connection mode of the clamping structure 22 and the first shell wall 11 is flexible to meet different actual needs.

[0152] It can be understood that, in any embodiment of the present application, the clamping cooperation between the clamping structure 22 and the pole body 21 can include but is not limited to: the inner periphery of the clamping structure 22 is formed with a clamping groove, and the outer peripheral wall of the pole body 21 is formed with an outer protrusion, and the outer protrusion is matched in the clamping groove; the inner periphery of the clamping structure 22 is formed with a clamping protrusion, and the outer peripheral wall of the pole body 21 is formed with a clamping groove, and the clamping protrusion is matched in the clamping groove.

[0153] Please refer to Figure 4 、 Figure 6 、 Figure 10 and Figure 13 In some embodiments, the support body 41 further has a separation portion 412 which is arranged around the first through hole 411, and the separation portion 412 is formed as an annular structure. The clamping structure 22 is welded and fixed with 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 separation portion 412 along the thickness direction of the first shell wall 11, so that the separation portion 411 separates the above welding position R1 of the clamping structure 22 from the active material coating portion 31. During the assembly or use of the battery monomer 100, the separation portion 412 can receive the welding slag at the welding position R1 to prevent the welding slag from falling on the active material coating portion 31, reduce the possibility of the welding slag piercing the active material coating portion 31, reduce the possibility of the welding slag piercing the pole piece and the isolation film, and improve the reliability of the battery monomer 100.

[0154] It can be understood that the welding position R1 of the pole assembly 2 and the first shell wall 11 can be located on the clamping structure 22 and on the outer peripheral side of the pole body 21, rather than on the pole body 21, so as to facilitate the dispersed arrangement of the connection of the pole body 21 with other components, facilitate the pole body 21 to provide a suitable position and a suitable size of the area for electrical connection with the conductive part 32, be conducive to reducing the influence on the electrical connection between the pole body 21 and the conductive part 32, and be conducive to improving the connection reliability of the pole body 21 and the conductive part 32.

[0155] It can be seen that part of the support body 41 can realize the physical isolation of the welding position R1 of the clamping structure 22 and the active material coating portion 31, so that the battery monomer 100 does not need to additionally separately arrange other components to separate the above welding position R1 from the active material coating portion 31, and the structure of the battery monomer 100 is facilitated to be simplified.

[0156] In the above technical solution, the partition portion 412 is arranged on the support body 41 between the first shell wall 11 and the active material coated portion 31, the partition portion 412 is arranged around the first through hole 411 for the conductive portion 32 to pass through, and the welding position R1 of the pole assembly 2 and the first shell wall 11 is opposite to the partition portion 412, so that the partition portion 412 separates the welding position R1 from the active material coated portion 31. Therefore, during the assembly process or the use process of the battery monomer 100, the partition portion 412 can receive the welding slag at the welding position R1 to prevent the welding slag from falling onto the active material coated portion 31, reduce the possibility of the welding slag piercing the active material coated portion 31, reduce the possibility of the welding slag piercing the pole piece and the isolation film, and improve the reliability of the battery monomer 100.

[0157] It can be understood that in the embodiments of the present application, no matter what structure the partition portion 412 is formed into, during the assembly process of the battery monomer 100, the welding slag generated when the clamping structure 22 and the first shell wall 11 are welded has a high temperature, and when the welding slag falls onto the partition portion 412, the welding slag can be embedded on the partition portion 412 under the action of gravity and temperature. In the subsequent use process, the welding slag embedded in the partition portion 412 is not easy to fall off and does not easily affect the normal use of the battery monomer 100. For example, the support body 41 is a plastic part.

[0158] Please refer to Figure 4 , Figure 6 , Figure 10 and Figure 13 In some embodiments, the partition portion 412 has an annular groove 412a, and the side of the groove 412a facing the welding position R1 is arranged in an open manner. In the above solution, by arranging the groove 412a on the partition portion 412 in an open manner on the side facing the welding position R1, the welding slag can fall into the groove 412a from the open side of the groove 412a, and the groove wall of the groove 412a can limit and guide the welding slag falling into it. At the same time, the arrangement of the groove 412a is beneficial to improve the collection capacity of the partition portion 412 for the welding slag, and is beneficial to further reduce the probability of the welding slag falling onto the active material coated portion 31 and improve the reliability of the battery monomer 100. Of course, the structure of the partition portion 412 is not limited to this. In other embodiments of the present application, the partition portion 412 can also be formed into a flat plate structure, so that the structure of the partition portion 412 is simple and easy to process.

[0159] Please refer to Figure 4 , Figure 6 , Figure 10 and Figure 13In some embodiments, the partition 412 includes a first portion 4121 opposite the welding position R1 along the thickness direction of the first shell wall 11, and a second portion 4122 bently connected to one end of the first portion 4121 away from the central axis L of the first through hole 411 and extending toward the welding position R1.

[0160] As can be seen, in the longitudinal section of the partition 412, the first portion 4121 and the second portion 4122 are substantially L-shaped structures, and the first portion 4121 and the second portion 4122 have the groove 412a, the radially inner side of the groove 412a is also open, and 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 up-down direction, the first portion 4121 is arranged around the first through hole 411, and the first portion 4121 is arranged below the welding position R1 between the clamping structure 22 and the first shell wall 11, and the second portion 4122 is arranged around the outer periphery of the first portion 4121, and the second portion 4122 extends upward from the outer periphery of the first portion 4121.

[0161] In the above technical solution, by arranging the partition 412 to include the first portion 4121 and the second portion 4122, and the first portion 4121 connected to one end of the second portion 4122 away from the welding position R1, the processing of the partition 412 is facilitated, and the forming of the groove 412a is facilitated.

[0162] For reference Figure 4 and Figure 13 In some embodiments, the first shell wall 11 is formed with a liquid injection hole 113, and the support body 41 is formed with a liquid injection channel 413, the liquid injection channel 413 penetrates through the support body 41 toward one side surface of the first shell wall 11 to form a liquid inlet 413a, the liquid inlet 413a is opposite to the liquid injection hole 113, at least one side of the liquid injection channel 413 toward the active material coating portion 31 is at least partially closed, and the side wall of the liquid injection channel 413 is formed with a liquid outlet 413b, and / or the side wall of the liquid injection channel 413 toward the active material coating portion 31 is formed with a liquid outlet 413b, and the liquid outlet 413b is communicated with the space between the support body 41 and the active material coating portion 31.

[0163] The active material coating part 31 is a key component of the battery cell assembly 3, and contains active materials participating in the chemical reaction of the battery. These active materials usually exist in the form of a coating on the battery cell assembly 3, and the coating plays a decisive role in the capacity, cycle life and performance of the battery cell 100. The liquid injection channel 413 communicates with the liquid injection hole 113 through the liquid inlet 413a, and the liquid injection channel 413 communicates with the space where the active material coating part 31 is located through the liquid outlet 413b. The liquid injection channel 413 communicates with both sides of the first shell wall 11 in the thickness direction of the support body 41. The liquid injection tool can be fitted at the liquid injection hole 113 to inject electrolyte into the containing cavity 10 through the liquid injection channel 413. Since the side of the liquid injection channel 413 facing the active material coating part 31 is at least partially closed, the electrolyte flows into the battery cell 100 in a gentler manner after passing through the liquid injection channel 413. The electrolyte first contacts the bottom wall of the side of the liquid injection channel 413 facing the active material coating part 31 during the injection process, and then flows to the liquid outlet 413b to complete the injection by flowing to the side of the support body 41 facing the active material coating part 31. The bottom wall of the liquid injection channel 413 can effectively slow down the flow rate and impact force of the electrolyte, so that the electrolyte does 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 use reliability of the battery cell 100.

[0164] It can be understood that if the side of the liquid injection channel 413 facing the active material coating part 31 is partially closed, the unsealed part of the side of the liquid injection channel 413 facing the active material coating part 31 forms an un-outlet 413b. At this time, the side wall of the liquid injection channel 413 facing the active material coating part 31 forms the liquid outlet 413b. Whether the liquid outlet 413b is formed on the peripheral wall of the liquid injection channel 413 is also acceptable. If the side of the liquid injection channel 413 facing the active material coating part 31 is fully closed, the liquid outlet 413b is formed on the peripheral wall of the liquid injection channel 413.

[0165] In the above technical solution, the liquid injection hole 113 is provided on the first shell wall 11, and the liquid injection channel 413 is provided on the support body 41, so that electrolyte can be injected into the containing cavity 10 through the liquid injection hole 113 and the liquid injection channel 413. Of course, if the sealing structure at the liquid injection hole 113 is configured to open the liquid injection hole 113, the electrolyte in the containing cavity 10 can also be discharged through the liquid injection hole 113 and the liquid injection channel 413. Moreover, since the side of the liquid injection channel 413 facing the active material coating part 31 is at least partially closed, the closed part of the side of the liquid injection channel 413 facing the active material coating part 31 can block the electrolyte during the injection process, so that the electrolyte does not directly impact the active material coating part 31, which is beneficial to improve the use reliability of the battery cell 100.

[0166] Optionally, the liquid injection channel 413 has a peripheral wall and a bottom wall, at least part of the peripheral wall and the bottom wall are located on the side of the support body 41 facing the active material coating part 31, and the liquid outlet 413b can be formed on the peripheral wall and / or the bottom wall of the liquid injection channel 413; for example, the liquid outlet 413b is formed on the bottom wall of the liquid injection channel 413, and there are two liquid outlets 413b, which are arranged at intervals and are separated by the bottom wall of the liquid injection channel 413. When the staff performs the liquid injection operation, the bottom wall can block the impact of the injected electrolyte on the active material coating part 31, and slow down the flow rate and impact force of the electrolyte, so that the protection effect of the active material coating part 31 is better.

[0167] Please refer to Figure 13 In some embodiments, the support body 41 further comprises a support part 414 and a connecting part 415, the thickness t2 of the support part 414 is greater than the thickness t1 of the connecting part 415 in the thickness direction of the first shell wall 11, so that the support part 414 protrudes from the connecting part 415 towards the active material coating part 31, there are n support parts 414, and the plurality of support parts 414 are arranged at intervals along the length direction of the first shell wall 11, n≥3 and n is a positive integer, the connecting part 415 is connected between any two adjacent support parts 414, the support part 414 abuts between the first shell wall 11 and the active material coating part 31, and the first perforation 411 is formed on the connecting part 415.

[0168] It can be seen that the support part 414 can be supported between the first shell wall 11 and the active material coating part 31 to reliably separate the first shell wall 11 from the active material coating part 31, so as to improve the insulation performance between the first shell wall 11 and the active material coating part 31, and at the same time, the support part 414 can play a certain supporting role on the active material coating part 31, which is beneficial to improve the setting stability and reliability of the battery cell assembly 3 and reduce the risk of shaking or displacement of the battery cell assembly 3; at the same time, the number of support parts 414 is greater than or equal to 3, which can realize multi-section support setting of the support body 41, form multiple support points between the first shell wall 11 and the active material coating part 31, so as to disperse and bear the stress generated by the active material coating part 31 due to deformation and the like during charging and discharging, which is beneficial to reduce the deformation of the first shell wall 11, maintain the overall shape of the battery monomer 100, thereby facilitating to enhance the structural stability and dimensional stability of the battery monomer 100, and is beneficial to reduce the risk of damage of the battery cell assembly 3; and the support part 414 is protruded from the connecting part 415 towards the active material coating part 31, so that the connecting part 415 can be spaced apart from the active material coating part 31, and the first perforation 411 and the partition part 412 are both formed on the connecting part 415, so that the support points between the first shell wall 11 and the active material coating part 31 can be arranged away from the conductive part 32, and the space between the connecting part 415 and the active material coating part 31 can provide a certain space for the arrangement of the conductive part 32.

[0169] In the above technical solution, by arranging three or more support parts 414, and protruding the support part 414 from the connecting part 415 towards the active material coating part 31, the support body 41 can form multiple support points between the first shell wall 11 and the active material coating part 31, improve the insulation between the first shell wall 11 and the active material coating part 31, and facilitate to enhance the structural stability and dimensional stability of the battery monomer 100, reduce the risk of damage of the battery cell assembly 3, and facilitate to provide space for the arrangement of the conductive part 32; in addition, the support body 41 and the battery cell assembly 3 have a suitable stop area, which is not too large to easily affect the smoothness of the exhaust when the battery cell assembly 3 is in thermal runaway, and the stop area is not too small to easily damage the battery cell assembly 3, which is beneficial to improve the reliability of the battery monomer 100.

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

[0171] Please refer to Figure 13In some embodiments, the plurality of support portions 414 includes 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 two ends of the length direction of the support body 41. The third support portion 4143 is arranged between the first support portion 4141 and the second support portion 4142. In the embodiments of the present application, the length direction of the support body 41 is the length direction of the first shell wall 11, the thickness direction of the support body 41 is the thickness direction of the first shell wall 11, and the width direction of the support body 41 is the width direction of the first shell wall 11.

[0172] In the above technical solution, by arranging the first support portion 4141 and the second support portion 4142 at two ends of the length direction of the support body 41, and arranging the third support portion 4143 between the first support portion 4141 and the second support portion 4142, the support body 41 can support the battery cell assembly 3 at both ends and the middle position of the length direction, and has a large support range, which is beneficial to improve the stability of the support body 41 and realize stable support of the battery cell assembly 3.

[0173] For reference Figures 13-16 In some embodiments, at least one support portion 414 is formed with a weight-reducing structure 4144. The number of support portions 414 formed 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 arranging the weight-reducing structure 4144 on at least one support portion 414, the material consumption of the support body 41 is saved, the weight of the support body 41 is reduced, and the volume of the support body 41 is saved, thereby reducing the occupation of the insulating support 4 to the accommodation cavity 10, thereby reducing the weight of the battery monomer 100 and improving the energy density of the battery monomer 100.

[0175] In the embodiments of the present application, the specific structure of the weight-reducing structure 4144 is not limited, and the weight-reducing structure 4144 can include at least one structure such as a groove or a hole. It can be understood that when at least two of the plurality of support portions 414 are formed with the weight-reducing structure 4144, the structure of the weight-reducing structure 4144 on different support portions 414 can be the same or different.

[0176] Exemplarily, as Figures 13-16As shown, 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 arranged between the first support portion 4141 and the second support portion 4142, and the first support portion 4141, the second support portion 4142, and the third support portion 4143 are respectively formed with a weight-reducing structure 4144. Optionally, the weight-reducing structure 4144 on the first support portion 4141 and the weight-reducing structure 4144 on the second support portion 4142 are of the same structure, both of which include the discharge channel 4144a and the weight-reducing hole 4144b described below; 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-reducing structure 4144 includes the discharge channel 4144a, and the discharge channel 4144a extends along the length direction of the first shell wall 11 to opposite sides of the portion of the corresponding support portion 414 protruding from the connecting portion 415, so that in the length direction of the first shell wall 11, the discharge channel 4144a can communicate the opposite sides of the support portion 414, so that when the battery monomer 100 is in thermal runaway, the discharge produced inside the battery monomer 100 can flow from one side of the support portion 414 to the other side through the discharge channel 4144a to flow towards the pressure relief valve of the battery monomer 100, which is conducive to improving the smoothness and reliability of the pressure relief of the battery monomer 100; and / or, the weight-reducing structure 4144 includes the weight-reducing hole 4144b, and the weight-reducing hole 4144b is closed at both ends in the length direction of the first shell wall 11, so that the portion of the support portion 414 defining the hole wall of the weight-reducing hole 4144b at both ends in the length direction of the first shell wall 11 can abut between the first shell wall 11 and the active material coating portion 31, so that the arrangement of the weight-reducing hole 4144b does not easily weaken the supporting effect of the support portion 414, and the support portion 414 reliably supports the active material coating portion 31.

[0178] In the above technical solution, by arranging the weight-reducing structure 4144 to include the discharge channel 4144a, the discharge channel 4144a can not only achieve lightweight design of the insulating support 4, but also achieve smooth pressure relief of the battery monomer 100, one thing with multiple uses; by arranging the weight-reducing structure 4144 to include the weight-reducing hole 4144b, the weight-reducing hole 4144b can not only achieve lightweight design of the insulating support 4, but also will not have a great impact on the supporting effect of the support portion 414. In addition, the arrangement of the discharge channel 4144a can appropriately increase the width of the support portion 414 to some extent, for example, the width of the support portion 414 can be equal to the width of the connecting portion 415, so as to facilitate the support portion 414 to support the entire battery cell assembly 3 in the width direction.

[0179] It can be understood that, for the discharge channel 4144a, the discharge channel 4144a can extend linearly or curvilinearly along the length direction of the first shell wall 11. Exemplarily, as shown in Figure 14 the discharge channel 4144a extends along the length direction of the first shell wall 11 to the opposite sides of the portion of the corresponding support part 414 protruding from the connecting part 415, so that the two ends of the discharge channel 4144a are formed into a first communication port and a second communication port respectively, and the first communication port and the second communication port are formed on the two sides of the support part 414 in the length direction of the first shell wall 11.

[0180] It can be understood that, when the weight reduction structure 4144 includes the discharge channel 4144a and the weight reduction hole 4144b, the light weight design of the insulation support 4 can be realized, and at the same time, the smooth pressure relief of the battery monomer 100 and the support effect of the support part 414 on the first shell wall 11 and the active material coating part 31 can be considered.

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

[0182] Exemplarily, the discharge channel 4144a is two, the weight reduction hole 4144b is one, and the weight reduction hole 4144b is arranged between the two discharge channels 4144a in the width direction of the first shell wall 11; or the weight reduction hole 4144b is two, the discharge channel 4144a is one, and the discharge channel 4144a is arranged between the two weight reduction holes 4144b in the width direction of the first shell wall 11; or the discharge channel 4144a and the weight reduction hole 4144b are multiple respectively, and one weight reduction hole 4144b is arranged between the two adjacent discharge channels 4144a and one discharge channel 4144a is arranged between the two adjacent weight reduction holes 4144b in the width direction of the first shell wall 11.

[0183] It can be understood that, when the discharge channel 4144a extends along the length direction of the first shell wall 11 to the opposite sides of the portion of the corresponding support part 414 protruding from the connecting part 415, the support strength of the portion of the support part 414 defining the two ends of the discharge channel 4144a in the length direction of the first shell wall 11, such as the portion of the support part 414 defining the first communication port and the second communication port described above, is relatively weak, and the two ends of the weight reduction hole 4144b in the length direction of the first shell wall 11 are closed, so that the support strength of the portion of the support part 414 defining the hole walls of the two ends of the weight reduction hole 4144b in the length direction of the first shell wall 11 is relatively strong.

[0184] In the technical solution, the discharge channels 4144a and the weight-reducing holes 4144b are alternately arranged in the width direction of the first shell wall 11, so that the distribution balance of the support strength of the support portions 414 at both ends of the first shell wall 11 in the length direction of the first shell wall 11 is improved, the overall support strength of the support portions 414 at both ends of the first shell wall 11 in the length direction of the first shell wall 11 is improved, and the support portions 414 can reliably support the battery cell assembly 3 and simultaneously meet the weight-reducing requirement and the pressure relief requirement.

[0185] Please refer to Figure 13 and Figure 14 In some embodiments, the weight-reducing structure 4144 includes the discharge channels 4144a and the weight-reducing holes 4144b, and the sides of the discharge channels 4144a and the weight-reducing holes 4144b away from the active material coated portion 31 are open, and the sides of the discharge channels 4144a and the weight-reducing holes 4144b toward the active material coated portion 31 are closed. For example, the discharge channels 4144a and the weight-reducing holes 4144b can be formed by recessing a portion of the side of the support body 41 toward the first shell wall 11 toward the active material coated portion 31.

[0186] In the technical solution, the sides of the discharge channels 4144a and the weight-reducing holes 4144b away from the active material coated portion 31 are open, and the sides of the discharge channels 4144a and the weight-reducing holes 4144b toward the active material coated portion 31 are closed, which facilitates the processing of the discharge channels 4144a and the weight-reducing holes 4144b. Moreover, the portion of the support body 41 that defines the closed side of the weight-reducing structure can be arranged 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 integral molding part, such as an injection molded support body 41, the mold that defines the discharge channels 4144a and the weight-reducing holes 4144b is at least partially located on the same side of the mold cavity, which facilitates the assembly and arrangement of the mold and facilitates the disassembly of the mold on the same side after molding, thereby improving the operation convenience. For another example, when the weight-reducing structure 4144 is formed by machining, the machining tool can process the discharge channels 4144a and the weight-reducing holes 4144b on the same side without needing to flip the workpiece, thereby improving the processing efficiency.

[0187] Please refer to Figures 13-17 In some embodiments, the portion of the support portions 414 corresponding to the sides of the discharge channels 4144a and the weight-reducing holes 4144b toward the active material coated portion 31 is flush with the portion of the support portions 414 that defines the closed side of the discharge channels 4144a toward the active material coated portion 31 and the portion of the support portions 414 that defines the closed side of the weight-reducing holes 4144b toward the active material coated portion 31.

[0188] Specifically, the support portion 414 can include a first portion 4121 enclosing a side of the exhaust passage facing the active material coating portion 31, and a second portion 4122 enclosing a side of the weight-reducing hole 4144b facing the active material coating portion 31, and the side surface of the first portion 4121 facing the active material coating portion 31 and the side surface of the second portion 4122 facing the active material coating portion 31 are in the same plane.

[0189] In the above technical solution, by setting the support portion 414 to be flush with the portion of the exhaust passage 4144a and the weight-reducing hole 4144b facing the active material coating portion 31, it is convenient to make the support portion 414 provide a larger and flat surface on the side facing the active material coating portion 31, and the support portion 414 is not easily affected by the setting of the exhaust passage 4144a and the weight-reducing hole 4144b to support the battery cell assembly 3, which is beneficial to improve the supporting effect of the support portion 414 on the battery cell assembly 3.

[0190] For reference Figures 13-16 In some embodiments, the weight-reducing structure 4144 is formed with a communication hole 4145 that communicates the opposite sides of the support portion 414 in the thickness direction of the first shell wall 11, that is, the communication hole 4145 penetrates the support portion 414 in the thickness direction of the first shell wall 11, and the electrolyte on the opposite sides of the support portion 414 in the thickness direction of the first shell wall 11 can flow through the communication hole 4145, and the electrolyte on the side of the support portion 414 away from the active material coating portion 31 can flow to the side where the active material coating portion 31 is located through the communication hole 4145 to soak the active material coating portion 31, so that the electrolyte on the side of the support portion 414 away from the active material coating portion 31 can also be fully utilized, which is beneficial to improve the cycle performance of the battery cell assembly 3 and improve the use reliability of the battery monomer 100.

[0191] In the above technical solution, by setting the support portion 414 to be flush with the portion of the exhaust passage 4144a and the weight-reducing hole 4144b facing the active material coating portion 31, it is convenient to make the support portion 414 provide a larger and flat surface on the side facing the active material coating portion 31, and the support portion 414 is not easily affected by the setting of the exhaust passage 4144a and the weight-reducing hole 4144b to support the battery cell assembly 3, which is beneficial to improve the supporting effect of the support portion 414 on the battery cell assembly 3.

[0192] In the technical solution, the electrolyte on the side of the support part 414 away from the active material coating part 31 can flow to the side where the active material coating part 31 is located through the communication hole 4145 to soak the active material coating part 31, so as to fully utilize the electrolyte in the accommodation cavity 10. Meanwhile, the communication hole 4145 is formed on the weight-reducing structure 4144 to fully utilize the space provided by the support part 414, which is beneficial to save the occupied space of the support part 414. In combination with the arrangement mode that the weight-reducing structure 4144 is closed on one side in the thickness direction of the first shell wall 11 and the communication hole 4145 is formed on the closed side, the weight-reducing structure 4144 and the communication hole 4145 are conveniently formed.

[0193] It can be understood 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. The discharge channel 4144a can be arranged in the following two modes. Figure 14 As shown in the first mode, the discharge channel 4144a is closed on the side away from the first shell wall 11 in the thickness direction of the first shell wall 11 and is open on the side facing the first shell wall 11 in the thickness direction of the first shell wall 11. At this time, the discharge channel 4144a can be formed by recessing a part of the side surface of the support body 41 away from the first shell wall 11 towards the first shell wall 11. If the discharge channel 4144a is formed with the communication hole 4145, the communication hole 4145 penetrates the closed side of the discharge channel 4144a.

[0194] Similarly, for the weight-reducing hole 4144b, the arrangement mode thereof cooperates with the discharge channel 4144a in a similar manner to the communication hole 4145, which will not be described herein again. Of course, in other embodiments of the present application, the communication hole 4145 on the support part 414 can also be formed at other positions of the support part 414, for example, the communication hole 4145 is arranged separately from the weight-reducing structure 4144, and is not limited to being arranged on the weight-reducing structure 4144.

[0195] Please refer toFigures 13-16 In some embodiments, the plurality of support portions 414 includes 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; the first shell wall 11 is provided with a pressure relief structure 5, the third support portion 4143 is opposite to the pressure relief structure 5, and the third support portion 4143 is formed with a discharge channel 4144a and a communication hole 4145. Since the communication hole 4145 penetrates through 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 portion 4143 can communicate the two sides of the third support portion 4143 in the length direction of the first shell wall 11 with the pressure relief structure 5, and the communication hole 4145 on the third support portion 4143 can communicate the side of the third support portion 4143 facing the active material coating portion 31 with the pressure relief structure 5, so that multiple sides of the third support portion 4143 can be communicated to the pressure relief structure 5, which is beneficial to improve the smoothness of the pressure relief of the battery monomer 100.

[0196] Moreover, each of the first support portion 4141 and the second support portion 4142 is respectively formed with a discharge channel 4144a, a weight-reducing hole 4144b, and a communication hole 4145, so as to enrich the functions of the first support portion 4141 and the second support portion 4142 on the premise of reliably supporting the battery cell assembly 3, which is beneficial to improve the reliability of the battery monomer 100.

[0197] Exemplarily, the structure of the first support portion 4141 is the same as that of the second support portion 4142; the following will be described by taking the first support portion 4141 as an example: the discharge channel 4144a and the weight-reducing hole 4144b on the first support portion 4141 are multiple, and the multiple discharge channels 4144a and the 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 away from the active material coating portion 31 is open, and the side of each discharge channel 4144a facing the active material coating portion 31 is closed, the side of each weight-reducing hole 4144b away from the active material coating portion 31 is open, and the side of each weight-reducing hole 4144b facing the active material coating portion 31 is closed, the part of the first support portion 4141 corresponding to the side of the discharge channel 4144a and the weight-reducing hole 4144b facing the active material coating portion 31 is flush, and the communication hole 4145 on the first support portion 4141 is formed on the closed side of the weight-reducing hole 4144b.

[0198] Please refer to Figure 4In some embodiments, the pole post assembly 2 further comprises an insulation structure 23, which is fitted between the clamping structure 22 and the pole post body 21. The insulation structure 23 can insulate the clamping structure 22 and the pole post body 21 at the fitted positions of the two, preventing the pole post body 21 and the clamping structure 22 from conducting short circuit.

[0199] In the above technical solution, the pole post assembly 2 is simple in structure and easy to process. Since the pole post assembly 2 comprises the pole post body 21 and the clamping structure 22, the shape and size of the pole post body 21 and the shape and size of the clamping structure 22 can be designed separately based on different factors, so as to flexibly adapt to the connection requirements of different forms of the shell assembly 1 and the battery cell assembly 3, and increase the application range of the pole post assembly 2.

[0200] Optionally, as shown in Figure 7 , the insulation structure 23 further comprises an insulation piece 232, the clamping structure 22 comprises a first adapter ring 221 and a second adapter ring 222, the second adapter ring 222 is arranged on the side of the first adapter ring 221 away from the battery cell assembly 3, the second adapter ring 222 is connected with the first adapter ring 221, the first adapter ring 221 is connected with the first shell wall 111, and the sealing structure 231 is clamped between the first adapter ring 221 and the peripheral portion of the pole post body 21. The second adapter ring 222 is insulated and fixedly fitted with the peripheral portion 212 through the insulation piece 232.

[0201] Thus, the clamping structure 22 comprises the first adapter ring 221 and the second adapter ring 222 arranged inside and outside and assembled and connected, so as to facilitate the assembly and connection of the clamping structure 22 with the insulation structure 23 and the pole post body 21, make the pole post assembly 2 easy to process and manufacture, and easily control the compression amount of the sealing structure 231, thereby improving the sealing reliability.

[0202] Please refer to Figure 10 again, for example, the clamping structure 22 further comprises an insulation frame 223, which is connected to the side of the first adapter ring 221 facing the battery cell assembly 3. Thus, the insulation frame 223 can play an insulating role between the battery cell assembly 3 and the first adapter ring 221, reducing the difficulty of setting the insulation structure here. For example, the insulation frame 223 has a latch, and the first adapter ring 221 has a socket, the latch is inserted into the socket in interference fit, so as to realize the connection of the insulation frame 223 and the first adapter ring 221.

[0203] For example, when the pole post assembly 2 comprises the pole post body 21, the clamping structure 22 and the insulation structure 23, during the assembly of the battery monomer 100, the “connecting the battery cell assembly 3 with the pole post assembly 2” can specifically comprise: connecting the battery cell assembly 3 with the pole post body 21; arranging the pole post assembly 2 connected with the battery cell assembly 3 at the mounting hole 111, and connecting the clamping structure 22 with the first shell wall 11.

[0204] Please refer to Figures 6-7 In some embodiments, the insulation structure 23 is also sealingly fitted between the clamping structure 22 and the pole body 21. In this way, the insulation structure 23 not only insulates the clamping structure 22 from the pole body 21, but also makes the fitting position of the clamping structure 22 and the pole body 21 in a sealed state, so as to isolate the inside and outside of the shell assembly 1 after the clamping structure 22 is connected to the first shell wall 11, reduce the risk of leakage of the electrolyte in the shell assembly 1 from the fitting position of the clamping structure 22 and the pole body 21 to the outside of the shell assembly 1, and reduce the risk of liquid or dust from the outside of the shell assembly 1 entering the shell assembly 1 from the fitting position of the clamping structure 22 and the pole body 21, thereby improving the reliability of the battery monomer 100.

[0205] In the above technical solution, since the insulation structure 23 is also sealingly fitted between the clamping structure 22 and the pole body 21, when the pole assembly 2 is installed to the first shell wall 11 and the clamping structure 22 is connected to the first shell wall 11, no sealing member 231 or the like is needed to be arranged between the clamping structure 22 and the first shell wall 11, and no large sealing pressure needs to be applied to meet the compression degree of the sealing member 231 at this position, thereby reducing the stress on the first shell wall 11 and protecting the shell assembly 1, thereby facilitating the reduction of the wall thickness of the shell assembly 1 and the reduction of the material cost. Moreover, since the first shell wall 11 is the end of the shell body 12 opposite to the opening 121, the stress at the connection between the first shell wall 11 and the second shell wall 114 can be reduced, and the stress on the second shell wall 114 can be reduced, thereby facilitating the reliability of the shell body 12 and the reduction of the wall thickness and cost of the shell body 12.

[0206] Please refer to Figure 7 In some embodiments of the present application, the insulation structure 23 includes a sealing member 231. In embodiments of the present application, the sealing member 231 is made of a material that has both sealing and insulating properties, for example, an elastic rubber member. Please refer to Figure 7 For example, at least part of the sealing member 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 embodiments of the present application, the direction from the inside of the first shell wall 11 to the outside of the first shell wall 11, and the direction from the outside of the first shell wall 11 to the inside of the first shell wall 11, are collectively referred to as the "thickness direction of the first shell wall 11". The "inside of the first shell wall 11" refers to the side of the first shell wall 11 facing the battery core assembly 3, and the "outside of the first shell wall 11" refers to the side of the first shell wall 11 away from the battery core assembly 3.

[0208] The sealing member 231 at least comprises a shaft side 231a, a side of the shaft side 231a facing the accommodating cavity 10 is an inner side of the shaft side 231a, and a side of the shaft side 231a away from the battery cell assembly 3 is an outer side of the shaft side 231a, the clamping structure 22 is partially clamped with one of the pole body 21 on the outer side of the shaft side 231a, and the other is partially clamped on the inner side of the shaft side 231a, so that the shaft side 231a is clamped between the clamping structure 22 and the pole body 21 in the inner and outer directions of the first shell wall 11, so as to realize the axial sealing between the clamping structure 22 and the pole body 21.

[0209] Therefore, by arranging at least part of the sealing member 231 clamped between the clamping structure 22 and the pole body 21 in the inner and outer directions of the first shell wall 11, the axial sealing between the clamping structure 22 and the pole body 21 is realized, and the axial sealing can achieve a more reliable sealing effect, thereby improving the leakage problem of the matching position of the clamping structure 22 and the pole body 21. Moreover, the embodiment of the present application can reduce the axial force acting on the first shell wall 11 by integrating the axial sealing such as the shaft side 231a in the pole assembly.

[0210] Please refer to Figure 7 , for example, the sealing member 231 is annularly arranged on the inner ring of the clamping structure 22 facing the pole body 21, that is, the inner ring of the clamping structure 22. In the embodiment of the present application, since the clamping structure 22 is arranged around the pole body 21 and connected with the first shell wall 11, the side of the clamping structure 22 facing the pole body 21 is the "inner ring of the clamping structure 22", and the side 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 arranging the sealing member 231 on the inner ring of the clamping structure 22, the sealing member 231 can approach the matching position of the clamping structure 22 and the pole body 21, which is beneficial to sealing the matching position of the clamping structure 22 and the pole body 21 in a shorter path, improving the reliability of the sealing, and is also beneficial to reducing the size of the sealing member 231, reducing the sealing area, easily realizing compression sealing, and improving the sealing effect.

[0211] In addition, when the insulation structure 23 comprises the sealing member 231, the sealing member 231 is clamped between the clamping structure 22 and the pole body 21 to seal the clamping structure 22 and the pole body 21, and the clamping structure 22 is formed in a long strip shape extending along the length direction of the first shell wall 11, and the pole body 21 is arranged at the length center position of the clamping structure 22 and is circular, since the connection position of the clamping structure 22 and the pole body 21 is uniformly stressed, the compression amount of the sealing member 231 can be easily controlled to improve the reliability of the sealing cooperation of the clamping structure 22 and the pole body 21, and the sealing area is relatively small and not easy to fail.

[0212] Please refer toFigure 6 、 Figure 7 and Figure 10 In some embodiments, the first shell wall 11 has a mounting hole 111, the pole assembly 22 is covered on the mounting hole 111, and the edge of the clamping structure 22 is overlapped on one side of the first shell wall 11 in the wall thickness direction. In this way, by covering the clamping structure 22 on one side of the first shell wall 11 in the wall thickness direction, i.e., covering the clamping structure 22 on the outside of the first shell wall 11 or covering the clamping structure 22 on the inside of the first shell wall 11, the assembly of the clamping structure 22 and the first shell wall 11 is facilitated.

[0213] Exemplarily, the clamping structure 22 is welded to the first shell wall 11. For example, after covering the clamping structure 22 on the first shell wall 11, the clamping structure 22 and the first shell wall 11 can be connected by welding, thereby facilitating processing and better ensuring the connection reliability of 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 welding seam formed by the connection of the two is exposed on the side of the first shell wall 11 away from the battery cell assembly 3, i.e., the side away from the active material coated portion 311, thereby facilitating welding operation and increasing welding space. The present application is not limited thereto, for example, in some other embodiments of the present application, the clamping structure 22 can also be provided to be inserted into the mounting hole 111 and riveted to the first shell wall 11.

[0214] Exemplarily, when the connection of the battery cell assembly 3 and the pole assembly 2 is performed first, and then the pole assembly 2 is assembled and connected to the first shell wall 11, the pole assembly 2 can be connected to the battery cell assembly 3 first, then assembled together into the shell body 12, and then the pole assembly 2 is extended out of the first shell wall 11; or for example, the battery cell assembly 3 is assembled into the shell body 12, the conductive portion 32 is inserted through the mounting hole 111 and connected to the pole assembly 2 previously provided on the outside of the first shell wall 11, and the pole assembly 2 is covered on the mounting hole 111 of the first shell wall 11 from the outside of the first shell wall 11, i.e., the side away from the active material coated portion 31. At this time, the edge of the clamping structure 22 is overlapped on the side of the first shell wall 11 away from the battery cell assembly 3. In this way, since the pole assembly 2 is covered on the first shell wall 11 from the outside, the assembly and connection of the pole assembly 2 and the first shell wall 11 are facilitated, which is beneficial to improving the connection reliability of the pole assembly 2 and the first shell wall 11.

[0215] Please refer to Figure 6In some embodiments, when the edge of the clamping structure 22 overlaps the side of the first shell wall 11 away from the battery cell assembly 3, a recessed groove 112 can be arranged around the mounting hole 111 on the first shell wall 11, the recessed groove 112 is open towards the direction away from the battery cell assembly 3, that is, the recessed groove 112 is open towards the direction away from the active material coated portion 31, and 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 around the clamping structure 22, and the flange portion 22a is embedded in the recessed groove 112. Thus, it is convenient to support and position the connection of the clamping structure 22 and the first shell wall 11, which is beneficial to the welding connection of the two from the outside of the first shell wall 11, that is, from the side away from the active material coated portion 31.

[0216] Exemplarily, the thickness of the flange portion 22a matches the groove depth of the recessed groove 112, wherein “match” means that the thickness of the flange portion 22a is basically consistent with the groove depth of the recessed groove 112. Thus, it is convenient to weld the flange portion 22a and the first shell wall 11, the thickness of the flange portion 22a is not too large relative to the groove depth of the recessed groove 112, which can reduce unnecessary occupation of space, and the thickness of the flange portion 22a is not too small relative to the groove depth of the recessed groove 112, which can meet the welding strength requirement.

[0217] Of course, in other embodiments of the present application, the connection of the battery cell assembly 3 and the pole assembly 2 is performed first, and then the pole assembly 2 is assembled and connected to the first shell wall 11, and after the connection of the battery cell assembly 3 and the pole assembly 2, the battery cell assembly 3 and the pole assembly 2 are loaded into the shell body 12 together, so that the pole assembly 2 can be arranged at the mounting hole 111 of the first shell wall 11 from the inside of the first shell wall 11, that is, from the side towards the active material coated portion 31, and at this time, the edge of the clamping structure 22 overlaps the side of the first shell wall 11 towards the battery cell assembly 3. Thus, since the pole assembly 2 is arranged at the mounting hole 111 from the inside of the first shell wall 11, the battery cell assembly 3 and the pole assembly 2 can be loaded into the shell body 12 together, and the pole assembly 2 does not need to pass through the mounting hole 111, thereby reducing the operation steps and reducing the operation difficulty.

[0218] In some embodiments, please refer again to Figures 6-8 The pole assembly 2 surrounds the accommodating groove 20 which is recessed towards the direction away from the battery cell assembly 3 and open towards the direction of the battery cell assembly 3 relative to the first shell wall 11, and at least part of the conductive portion 32 is accommodated in the accommodating groove 20. That is, the pole assembly 2 surrounds the accommodating groove 20, the groove wall of the accommodating groove 20 is formed by the pole assembly 2, the accommodating groove 20 is recessed towards the direction away from the active material coated portion 31, and the accommodating groove 20 is open towards the direction of the active material coated portion 31, so that the accommodating groove 20 communicates with the accommodating cavity 10.

[0219] Therefore, by arranging the accommodating groove 20 to accommodate the conductive part 32, the space occupied by the conductive part 32 in the accommodating cavity 10 can be reduced, so that the accommodating cavity 10 has more space to accommodate the active material coating part 31, which is beneficial to increase the volume of the active material coating part 31, thereby increasing the energy density of the battery monomer 100. Moreover, since the accommodating groove 20 is open towards the direction of the battery cell assembly 3, the conductive part 32 can easily extend into the accommodating groove 20, thereby reducing the operation difficulty.

[0220] For example, please refer to Figures 6-8 The accommodating groove 20 is formed on the side of the pole body 21 and the clamping structure 22 facing the battery cell assembly 3, i.e. the side facing the active material coating part 31, and the clamping structure 22 protrudes towards the direction away from the battery cell assembly 3, i.e. the direction away from the active material coating part 31, relative to the first shell wall 11, so that the accommodating groove 20 is recessed towards the direction away from the battery cell assembly 3 relative to the first shell wall 11.

[0221] Therefore, by processing the clamping structure 22 into a protruding form, a part of the accommodating groove 20 is formed on the side of the pole body 21 facing the battery cell assembly 3, and another part of the accommodating groove 20 is formed on the side of the clamping structure 22 facing the battery cell assembly 3, and the accommodating groove 20 is recessed towards the direction away from the battery cell assembly 3 relative to the first shell wall 11, so that the side of the pole body 21 facing the battery cell assembly 3 and the side of the clamping structure 22 facing the battery cell assembly 3 both have space to accommodate the conductive part 32 of the accommodating groove 20, which not only facilitates the accommodation of the conductive part 32 to a greater extent, but also facilitates the form diversity design of the conductive part 32.

[0222] For example, please refer to Figure 4 In some embodiments, the shell assembly 1 includes a shell body 12 and a shell cover 13, the shell body 12 is a one-piece, and one end of the shell body 12 is open, and the shell cover 13 is arranged at the open end of the shell body 12. For example, the open end of the shell body 12 has an opening 121, and the shell cover 13 is arranged at the opening 121, and the shell body 12 and the shell cover 13 together enclose the accommodating cavity 10. Figure 4 According to the above description, the first shell wall 11 is located at the end of the shell body 12 away from the shell cover 13, i.e. the shell wall at the end of the shell body 12 opposite to the opening 121 is the first shell wall 11; or the first shell wall 11 is formed on the shell cover 13, and the shell cover 13 serves as the first shell wall 11.

[0223] Of course, in other examples, the shell assembly 1 can also include two shell bodies 12, and one end of each shell body 12 is open to form an opening 121, and the openings 121 of the two shell bodies 12 are opposite to each other and cover each other, and the two shell bodies 12 together enclose the accommodating cavity 10, and the shell wall at the end of one of the shell bodies 12 opposite to the opening 121 is the first shell wall 11.

[0224] In some embodiments, in combination with the above description,Figure 4 The housing assembly 1 includes a housing body 12 that forms a receiving cavity 10. One end of the housing body 12 is open to form an opening 121, and the end wall of the housing body 12 opposite to the opening 121 is a first housing wall 11. It is understood that the housing body 12 is a one-piece molded part and includes a first housing wall 11 and a second housing wall 114. The second housing wall 114 surrounds the edge of the first housing wall 11 and extends from the edge of the first housing wall 11 toward one side in the thickness direction of the first housing wall 11. The end of the second housing wall 114 away from the first housing wall 11 has an opening 121, and a cavity is formed between the first housing wall 11 and the second housing wall 114, which constitutes 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, combined Figure 4 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. The end of the housing body 12 opposite to the opening 121 serves as a first housing wall 11. Alternatively, by way of 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. 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 body 12 opposite to the opening is the first shell wall 11, and the electric core assembly 3 accommodated in the shell assembly 1 is connected with the pole column assembly 2 mounted on the first shell wall 11, when the battery device 200 vibrates or deforms, the pole column assemblies 2 connected by the bus member will pull each other. Since the pole column assembly 2 is arranged on the end wall of the shell body 12 opposite to the opening 121, the force acting on the pole column assembly 2 will be preferentially transmitted to the shell body 12, and will not directly act on the shell body matching structure such as the shell cover 13. Therefore, not only the distance of the force transmission to the connection between the shell body 12 and the shell body matching structure such as the shell cover 13 can be prolonged, but also the shell body 12 will deform preferentially when subjected to force, so as to reduce the stress at the connection between the shell body 12 and the shell body matching structure such as the shell cover 13, thereby effectively reducing the probability of cracking at the connection between the shell body 12 and the shell body matching structure such as the shell cover 13 during use of the battery 100, and improving the reliability of the battery monomer 100. Moreover, since the connection position of the shell body 12 and the shell body matching structure such as the shell cover 13 is not prone to cracking, the wall thickness of the two can not be increased to increase the connection reliability, thereby facilitating the reduction of weight and material cost, and facilitating the miniaturization of the battery monomer 100 or the improvement of the energy density of the battery monomer 100. The connection mode of the shell body 12 and the shell body matching structure is not limited, for example, can be bonding, welding, etc.

[0228] Exemplarily, when the end wall of the shell body 12 opposite to the opening 121 is the first shell wall 11 for mounting the pole column assembly 2, if the pole column assembly 2 is first mounted at the mounting hole 111 of the first shell wall 11, and then the electric core assembly 3 is assembled into the shell body 12, it is difficult to connect the electric core assembly 3 and the pole column assembly 2. In some embodiments of the present application, the connection of the electric core assembly 3 and the pole column assembly 2 can be performed first, and then the pole column assembly 2 is assembled and connected to the shell assembly 1, so that the connection requirements of the electric core assembly 3 and the pole column assembly 2 can be met, and the connection requirements of the pole column assembly 2 and the shell assembly 1 can also be met, thereby improving the reliability and processability of the battery monomer 100.

[0229] Moreover, such a processing sequence can effectively shorten the length of the conductive part 32, for example, as long as the first connection of the electric core assembly 3 and the pole column assembly 2 and the later connection of the pole column assembly 2 and the shell assembly 1 can be met, thereby saving the material and cost of the conductive part 32, reducing the redundancy of the conductive part 32, reducing the short circuit risk, and reducing the space occupation of the conductive part 32 in the shell assembly 1, thereby facilitating the improvement of the energy density of the battery monomer 100.

[0230] Please refer to Figure 3In some embodiments of the present application, the battery cell 100 further comprises a pressure relief structure 5 arranged on the shell assembly 1. For example, the pressure relief structure 5 can be an explosion-proof valve arranged on the shell assembly 1, or a thinned area integrally formed on the shell assembly 1. In this way, by arranging the pressure relief structure 5, when the pressure in the shell assembly 1 exceeds a preset value, the pressure relief structure 5 can be used to direct the pressure relief, thereby improving the reliability of the battery cell 100. The pressure relief structure 5 can be arranged on the first shell wall 11, or on other shell walls other than the first shell wall 11. The first shell wall 11 can be one or more.

[0231] For example, in combination with the above-mentioned technical solutions, Figure 3 The pressure relief structure 5 and the pole assembly 2 are located on the same side. Since the pole assembly 2 is arranged on the first shell wall 11, when the pressure relief structure 5 is also arranged on the first shell wall 11, the pressure relief structure 5 and the pole assembly 2 are located on the same side. In this way, the design of other shell walls other than the first shell wall 11 can be simplified, and the structure and processing of the battery cell 100 can be simplified.

[0232] For example, the pressure relief structure 5 and the pole assembly 2 are located on different sides. Since the pole assembly 2 is arranged on the first shell wall 11, when the pressure relief structure 5 is arranged on other walls of the shell assembly 1 other than the first shell wall 11, for example, the pressure relief structure 5 is arranged on the second shell wall 114, or the pressure relief structure 5 is arranged on the shell cover 13, the pressure relief structure 5 and the pole assembly 2 are located on different sides. In this way, without considering that the pressure relief structure 5 occupies the space of the first shell wall 11 to reduce the volume of the pole assembly 2, the shape and volume of the pole assembly 2 can be flexibly designed as needed.

[0233] For example, the shell assembly 1 can be surrounded by multiple non-coplanar shell walls, for example, the shell wall components of a cuboid are surrounded by six shell walls, one of which is the first shell wall 11. The pressure relief structure 5 is arranged on any other shell wall other than the first shell wall 11, and the pole assembly 2 is arranged on the first shell wall 11. In this way, the pressure relief structure 5 and the pole assembly 2 are located on different sides.

[0234] In a second aspect, the embodiments of the present application provide a battery device 200, comprising a plurality of the above-mentioned battery cells 100.

[0235] In the above technical solution, since the battery cell 100 is used, the performance of the battery device 200 can be improved

[0236] In a third aspect, the embodiments of the present application provide an electric device 500, comprising the above-mentioned battery device 200, and the battery device 200 is used to store or provide electric energy.

[0237] In the above technical solution, since the performance of the battery device 200 is improved, the working performance of the electric device 500 can be improved.

[0238] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other in the case of no conflict.

[0239] The above only is the preferred embodiment of the present application, and is not used to limit the present application, and the present application can have various changes and changes for the person skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, The partition has an annular groove, which is open on one side facing the welding position.

16. The battery cell according to claim 15, characterized in that, 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, characterized in that, The partition is constructed as a flat plate structure.

18. The battery cell according to any one of claims 1-17, characterized in that, 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, characterized in that, 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, characterized in that, At least one of the support portions has a weight-reducing structure.

21. The battery cell according to claim 20, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, It includes multiple battery cells according to any one of claims 1-33.

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

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