Battery cell, battery device, and electric device

Abstract

This application provides a battery cell, a battery device, and an electrical appliance. The battery cell includes a casing, electrode terminals, and a first insulating member. The casing includes a first wall; the electrode terminals are disposed on the first wall, and each electrode terminal includes a main body portion and a protrusion disposed on the periphery of the main body portion; the first insulating member is at least partially disposed between the electrode terminals and the first wall, and the first insulating member at least partially surrounds the electrode terminals; wherein, the electrode terminals include a first limiting portion disposed on the periphery of the main body portion, and the first insulating member is provided with a second limiting portion, the second limiting portion cooperating with the first limiting portion.

Description

Battery monomer, battery device and electric equipment TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery monomer, a battery device and an electric equipment. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the manufacturing process of the battery, the overcurrent capacity of the battery is a problem that cannot be ignored. Therefore, how to improve the overcurrent capacity of the battery is a technical problem that needs to be solved in the battery technology.

[0004] SUMMARY

[0005] The present application provides a battery monomer, a battery device and an electric equipment, which can improve the overcurrent capacity of the battery monomer.

[0006] The present application is realized by the following technical scheme:

[0007] In a first aspect, the present application provides a battery monomer, which comprises a shell, an electrode terminal and a first insulating member. The shell comprises a first wall; the electrode terminal is arranged on the first wall, and the electrode terminal comprises a main body portion and a protruding portion arranged on the periphery of the main body portion; the first insulating member is at least partially arranged between the electrode terminal and the first wall, and the first insulating member is at least partially arranged around the electrode terminal; wherein the electrode terminal comprises a first limiting portion arranged on the periphery of the main body portion, and the first insulating member is provided with a second limiting portion which cooperates with the first limiting portion.

[0008] According to the battery monomer of the present application, the second limiting portion cooperates with the first limiting portion to limit the rotation of the electrode terminal relative to the first wall; the protruding portion is arranged on the periphery of the main body portion, and the protruding portion is used for the cooperation between the electrode terminal and the first wall to facilitate the assembly of the electrode terminal and the first wall; the first limiting portion is arranged on the periphery of the main body portion, and under the condition of meeting the anti-rotation cooperation (hereinafter referred to as anti-rotation cooperation) between the electrode terminal and the first insulating member, the size of the protruding portion protruding from the main body portion can be reduced, and the area of the main body portion in the plane perpendicular to the central axis of the main body portion can be increased, so as to improve the overcurrent capacity of the battery monomer. Especially when applied to a battery monomer with a relatively small thickness, the first limiting portion is arranged on the periphery of the main body portion, the size of the protruding portion protruding from the main body portion is reduced, and the area of the main body portion in the plane perpendicular to the central axis of the main body portion is increased, which can improve the space utilization of the electrode terminal in the thickness direction of the battery monomer, and further improve the overcurrent capacity of the battery monomer.

[0009] According to some embodiments of the present application, the first limiting part is connected to the protruding part along the thickness direction of the first wall.

[0010] In the above scheme, the first limiting part extends to the protruding part along the thickness direction of the first wall, so that the first insulating part has a larger connecting area with the electrode terminal, and the anti-rotation effect of the first insulating part on the electrode terminal can be enhanced.

[0011] According to some embodiments of the present application, the first limiting part is a first protrusion, and the second limiting part is a first groove, and at least a part of the first protrusion is embedded in the first groove.

[0012] In the above scheme, the first limiting part is a first protrusion, which can enhance the overall strength of the electrode terminal; the first protrusion and the first groove cooperate, which is convenient for processing and assembly, and has a good anti-rotation effect.

[0013] According to some embodiments of the present application, the surface of the first protrusion away from the surface of the main body part does not exceed the outer circumferential surface of the protruding part.

[0014] In the above scheme, the surface of the first protrusion away from the central axis of the main body part does not exceed the outer circumferential surface of the protruding part, so that the first protrusion occupies a smaller space in the plane perpendicular to the central axis of the main body part, so that the first insulating part has a higher overall strength.

[0015] According to some embodiments of the present application, the number of first limiting parts and the number of second limiting parts are both multiple, the multiple first limiting parts are arranged at intervals along the circumference of the electrode terminal, and the second limiting parts correspond one-to-one to the first limiting parts.

[0016] In the above scheme, the number of first limiting parts and the number of second limiting parts are both multiple, so as to form an anti-rotation cooperation at multiple positions in the circumferential direction of the electrode terminal, and improve the anti-rotation effect on the electrode terminal.

[0017] According to some embodiments of the present application, the first wall comprises a wall part and a connecting part connected to each other, the connecting part is arranged at least partially around the electrode terminal, and the connecting part is used to fix the electrode terminal to the wall part; at least a part of the protruding part is arranged between the wall part and the connecting part along the thickness direction of the wall part.

[0018] In the above scheme, the wall part and the connecting part cooperate to clamp the protruding part, and have a good constraint effect on the protruding part.

[0019] According to some embodiments of the present application, the connecting part is integrally formed with the wall part.

[0020] In the above scheme, the connecting part is integrally formed with the wall part, which is convenient for processing and manufacturing, and the connecting stability of the connecting part and the wall part is higher.

[0021] According to some embodiments of the present application, the first limiting portion is connected to the protruding portion along the thickness direction of the wall portion; the first limiting portion is a first protrusion, and the second limiting portion is a first recess, and at least a part of the first protrusion is embedded in the first recess.

[0022] In the above scheme, the first limiting portion is a first protrusion, and the first protrusion can extend from the protruding portion in a direction away from the interior of the battery monomer, thereby improving the overall strength of the electrode terminal.

[0023] According to some embodiments of the present application, the connecting portion and the first limiting portion do not overlap along the thickness direction of the wall portion.

[0024] In the above scheme, the connecting portion and the first limiting portion do not overlap, thereby reducing the space occupation of the structure after the connecting portion is matched with the electrode terminal in the thickness direction of the wall portion, so as to improve the energy density of the battery monomer.

[0025] According to some embodiments of the present application, the connecting portion has an overlapping portion overlapping with the protruding portion along the thickness direction of the wall portion, the overlapping portion has a first surface facing the protruding portion, and the first limiting portion is beyond the first surface along a direction in which the inner side of the wall portion points to the outer side of the wall portion.

[0026] In the above scheme, the first limiting portion is beyond the first surface, on the one hand, the size of the first limiting portion in the thickness direction of the wall portion can be larger, so as to improve the anti-rotation effect on the electrode terminal; on the other hand, the connecting portion can be closer to the protruding portion in the thickness direction of the wall portion, so as to reduce the space occupation of the structure after the connecting portion is matched with the electrode terminal. At the same time, when the first limiting portion extends to the protruding portion and the first limiting portion is a first protrusion, the overall strength of the electrode terminal can be improved.

[0027] According to some embodiments of the present application, the overlapping portion further has a second surface away from the protruding portion, and the first limiting portion is beyond the second surface along a direction in which the inner side of the wall portion points to the outer side of the wall portion.

[0028] In the above scheme, the first limiting portion is beyond the second surface, on the one hand, the size of the first limiting portion in the thickness direction of the wall portion is larger, thereby further improving the anti-rotation effect on the electrode terminal; on the other hand, the connecting portion can be closer to the protruding portion in the thickness direction of the wall portion, thereby further reducing the space occupation of the structure after the connecting portion is matched with the electrode terminal.

[0029] According to some embodiments of the present application, the first limiting portion comprises a first sub-limiting portion and a second sub-limiting portion connected to each other, the second sub-limiting portion is farther away from the central axis of the main body portion than the first sub-limiting portion, the first sub-limiting portion is beyond the second sub-limiting portion along a direction in which the inner side of the wall portion points to the outer side of the wall portion, and the second sub-limiting portion does not exceed the first surface.

[0030] In the above scheme, the first sub-limiting part and the second sub-limiting part are different in height in the thickness direction of the wall part, when the first limiting part is the first protrusion, the first limiting part is connected with the protruding part, and the overall strength of the electrode terminal can be improved; the second sub-limiting part does not exceed the first surface, so that the structure after the connecting part is matched with the electrode terminal occupies a smaller space in the thickness direction of the wall part.

[0031] According to some embodiments of the present application, the first insulating part is arranged between the electrode terminal and the connecting part, and the first insulating part separates the electrode terminal and the connecting part.

[0032] In the above scheme, the first insulating part realizes the insulation separation of the electrode terminal and the connecting part, so as to reduce the risk of positive and negative contact short circuit.

[0033] According to some embodiments of the present application, the connecting part and the first insulating part are both arranged around the electrode terminal.

[0034] In the above scheme, the connecting part is arranged around the electrode terminal, which can constrain the electrode terminal at any position in the circumferential direction of the electrode terminal; the first insulating part is arranged around the electrode terminal, which can separate the electrode terminal and the connecting part at any position in the circumferential direction of the electrode terminal, and improve the insulation effect.

[0035] According to some embodiments of the present application, the connecting part is welded with the wall part to form a first welding mark, and the first welding mark is arranged around the electrode terminal.

[0036] In the above scheme, the connecting part is welded with the wall part, which improves the connection stability of the connecting part and the wall part, and the first welding mark is arranged around the electrode terminal, which improves the connection reliability of the connecting part and the wall part.

[0037] According to some embodiments of the present application, the wall part has two first edges oppositely arranged along the width direction thereof, and the minimum distance between the first welding mark and the first edge is greater than or equal to 1mm and less than or equal to 5mm along the width direction.

[0038] In the above scheme, the size of the electrode terminal in the thickness direction of the battery monomer can be increased, the space utilization of the electrode terminal in the thickness direction of the battery monomer is improved, so as to increase the overcurrent capacity, and the thickness of the battery monomer can be reduced when the size of the electrode terminal in the thickness direction of the battery monomer is unchanged, so as to meet the overcurrent demand of the battery monomer with thinner thickness.

[0039] According to some embodiments of the present application, the width of the first wall is greater than or equal to 15mm and less than or equal to 40mm.

[0040] In the above scheme, the width direction of the first wall can be parallel to the thickness direction of the battery cell, the width of the first wall satisfies the above range, the battery cell has a relatively thin thickness, the size of the protruding part protruding from the main part is reduced, and the battery cell with a relatively thin thickness can be adapted.

[0041] According to some embodiments of the present application, the connecting part includes a first section located at one side of the wall part in the thickness direction of the wall part, the first section includes a main part and a thinning part connected to each other, the thinning part faces the surface of the wall part farther away from the wall part than the surface of the main part in the thickness direction of the wall part to form a thinning groove at the side of the first section facing the wall part, a part of the protruding part is located between the thinning part and the wall part, and the first insulating part is partially accommodated in the thinning groove.

[0042] In the above scheme, a part of the protruding part is located between the thinning part and the wall part, the connecting part and the wall part cooperate to clamp the electrode terminal in the thickness direction of the wall part, so as to facilitate the assembly of the electrode terminal to the wall part; the thickness of the thinning part is reduced relative to the thickness of the main part, which can reduce the space occupied by the connecting part after being assembled with the electrode terminal, improve the space utilization of the battery cell in the thickness direction of the wall part, and help to improve the energy density of the battery cell; the first insulating part is partially accommodated in the thinning groove, which meets the requirement of insulating and isolating the thinning part and the electrode terminal.

[0043] According to some embodiments of the present application, the connecting part includes a first sub-connecting part and a second sub-connecting part connected to each other, the first sub-connecting part is connected to the wall part, and the hardness of the second sub-connecting part is greater than that of the first sub-connecting part.

[0044] In the above scheme, the hardness of the second sub-connecting part is greater than that of the first sub-connecting part, which can improve the overall strength of the connecting part and improve the anti-deformation ability of the connecting part to have a better restraining effect on the electrode terminal.

[0045] According to some embodiments of the present application, the width of the first wall is W, the size of the main part in the width direction of the first wall is D, and 0.3*W≤D≤0.8*W is satisfied.

[0046] In the above scheme, the size of the main part in the width direction of the first wall satisfies the above range, so that the main part has a larger flow area, the battery cell has a better flow effect, and the assembly of the electrode terminal and the first wall is facilitated.

[0047] According to some embodiments of the present application, the first wall is provided with an electrode lead-out hole, and the electrode terminal covers the electrode lead-out hole; the first insulating piece is arranged along the circumference of the electrode lead-out hole, and at least a part of the first insulating piece is arranged between the protruding part and the first wall along the thickness direction of the first wall; a part of the main body part is arranged at the electrode lead-out hole, and the battery monomer further comprises a sealing piece arranged along the circumference of the electrode lead-out hole, and at least a part of the sealing piece is arranged between the protruding part and the first wall along the thickness direction of the first wall.

[0048] In the above scheme, the electrode lead-out hole is arranged to facilitate the assembly of the electrode terminal and the first wall and the electrical connection of the electrode terminal and the tab; the first insulating piece is arranged along the circumference of the electrode lead-out hole, and the first insulating piece is annular to facilitate the insulation and isolation of the electrode terminal and the first wall at any position in the circumferential direction of the electrode terminal; the protruding part cooperates with the main body part to cover the electrode lead-out hole, and at least a part of the sealing piece is arranged between the protruding part and the first wall to realize the sealing cooperation of the protruding part and the first wall, thereby reducing the risk of outflow of electrolyte and other substances from the electrode lead-out hole.

[0049] According to some embodiments of the present application, the battery monomer further comprises an electrode assembly having a tab; the electrode terminal comprises a first part and a second part connected to each other, the first part and the second part are arranged in a stacked manner along the thickness direction of the first wall, the first part is used to connect with the busbar member, the second part is used to connect with the tab, and the material of the first part is different from that of the second part; the first part comprises a first main body part and a first protruding part, the first protruding part protrudes from the circumferential side of the first main body part, the first main body part constitutes a part of the main body part, the first protruding part constitutes a part of the protruding part, and the first limiting part is arranged on the first main body part.

[0050] In the above scheme, the material of the first part is different from that of the second part to facilitate the connection of the first part with the busbar member and the connection of the second part with the tab, thereby meeting the assembly requirements of the electrode terminal with the busbar member and the tab.

[0051] According to some embodiments of the present application, the second part comprises a second main body part and a second protruding part, the second protruding part protrudes from the circumferential side of the second main body part, the second main body part and the first main body part constitute the main body part, the second protruding part and the first protruding part constitute the protruding part, and the first protruding part completely overlaps the second protruding part along the thickness direction of the first wall.

[0052] In the above scheme, the second main body part is connected with the first main body part to constitute the main body part, and the second protruding part is connected with the first protruding part to constitute the protruding part, which not only facilitates the processing and manufacturing, but also makes the electrode terminal have a higher overall strength.

[0053] According to some embodiments of the present application, the material of the first part is aluminum, and the material of the second part is copper.

[0054] In the above scheme, the material of the first part is aluminum, which on the one hand reduces the cost, and on the other hand facilitates the connection with the current collecting member; the material of the second part is copper, which facilitates the welding with the tab. For example, when the material of the negative tab is copper, the material of the second part is copper, which facilitates the welding of the electrode terminal and the negative tab. Wherein, the material of the first part is aluminum, which means that the base material of the first part is aluminum, for example, the first part can be pure aluminum, or can also be an aluminum alloy.

[0055] According to some embodiments of the present application, the shell comprises a housing and an end cover, the housing has an opening, and the end cover covers the opening, the end cover being a first wall.

[0056] In the above scheme, the end cover is a first wall, which facilitates the assembly of the electrode terminal and the first wall, and the assembly of the electrode terminal and the electrode assembly.

[0057] In a second aspect, the embodiments of the present application also provide a battery device, which comprises the battery monomer provided by any of the above embodiments.

[0058] In a third aspect, the embodiments of the present application also provide a power consuming device, which comprises the battery monomer provided by any of the above embodiments or the battery device provided by any of the above embodiments, and the battery monomer or the battery device is used to provide electric energy.

[0059] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0060] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0061] Fig. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0062] Fig. 2 is a structural exploded schematic diagram of a battery device provided by some embodiments of the present application;

[0063] Fig. 3 is a structural exploded schematic diagram of a battery monomer provided by some embodiments of the present application;

[0064] Fig. 4 is a sectional view of part of the structure of a battery monomer provided by some embodiments of the present application;

[0065] Fig. 5 is a structural schematic diagram of an electrode terminal provided by some embodiments of the present application;

[0066] FIG. 6 is a structural schematic diagram of a first insulating member according to some embodiments of the present application;

[0067] FIG. 7 is a sectional view of a partial structure of a battery cell according to some other embodiments of the present application;

[0068] FIG. 8 is a schematic diagram of the positional relationship between a first limiting portion and a connecting portion according to some embodiments of the present application;

[0069] FIG. 9 is a schematic diagram of the positional relationship between a first limiting portion and a connecting portion according to some other embodiments of the present application;

[0070] FIG. 10 is a schematic diagram of the positional relationship between a first limiting portion and a connecting portion according to some further embodiments of the present application;

[0071] FIG. 11 is a structural schematic diagram of a connecting portion according to some embodiments of the present application;

[0072] FIG. 12 is a schematic diagram of a partial structure of a battery cell according to some embodiments of the present application;

[0073] FIG. 13 is a sectional view of a partial structure of a battery cell according to some further embodiments of the present application;

[0074] FIG. 14 is a structural schematic diagram of a connecting portion according to some embodiments of the present application;

[0075] FIG. 15 is a structural schematic diagram of an electrode terminal according to some other embodiments of the present application.

[0076] In the drawings, the drawings are not drawn according to the actual proportions.

[0077] Label description: 100 - battery device; 10 - battery monomer; 11 - shell; 111 - housing; 112 - end cover; 113 - first wall; 1131 - electrode lead-out hole; 114 - wall part; 1141 - first edge; 115 - connecting part; 1151 - overlapping part; 1151a - first surface; 1151b - second surface; 1152 - first section; 1152a - main body area; 1152b - thinning area; 1152c - thinning groove; 1153 - first sub connecting part; 1154 - second sub connecting part; 1155 - fourth limiting part; 116 - first welding mark; 12 - electrode assembly; 121 - tab; 13 - electrode terminal; 131 - main body part; 131a - first end face; 131b - second end face; 132 - protruding part; 133 - first limiting part; 1331 - first sub limiting part; 1332 - second sub limiting part; 134 - first protrusion; 135 - first part; 1351 - first main body part; 1352 - first protruding part; 136 - second part; 1361 - second main body part; 1362 - second protruding part; 14 - first insulating piece; 141 - second limiting part; 142 - first groove; 143 - third limiting part; 15 - sealing piece; 16 - adapter; 17 - second insulating piece; 20 - box body; 21 - first sub box body; 22 - second sub box body; 200 - controller; 300 - motor; 1000 - vehicle; P - central axis of the main body part; X - width direction; Y - length direction; Z - thickness direction of the first wall. DETAILED DESCRIPTION

[0078] In order to make the objects, 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 and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of 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 work fall within the protection scope of the present application.

[0079] 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 of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0080] Reference within this application 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 of one another. As used in this application, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise, or clear from context, "X employs A or B" means that X employs A or B or both. In addition, the term "another" is used interchangeably with "one or more". As used in this application, the term "another" is intended to mean "at least one" or "one or more", unless specified otherwise.

[0081] In the description of the application, it is necessary to explain that, unless otherwise expressly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0082] In this 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 mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0083] In this application, "multiple" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two groups), and "multiple pieces" means more than two pieces (including two pieces).

[0084] The battery device mentioned in the embodiments of the application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a hybrid manner through a busbar component.

[0085] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery 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.

[0086] In some embodiments, the battery device can be a battery pack including a box body and one or more battery cell assemblies accommodated in the box body.

[0087] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0088] As an example, the battery cell assembly can also be housed in the box by directly fixing a plurality of battery cells to the box.

[0089] As an example, the box can include a first box and a second box. The first box and the second box are fastened so that an enclosed space is formed inside the box to accommodate the battery cell assembly. The enclosed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0090] As an example, the box 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 to accommodate the battery cell assembly.

[0091] As an example, the box can be part of a chassis structure of a vehicle. For example, the top cover of the box can be at least part of the floor of the vehicle, or the frame of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0092] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0093] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0094] The battery cell can be, but is not limited to, a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc.

[0095] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time, the active ions can pass through.

[0096] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0097] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction of itself, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0098] As an example, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. that is surface silver-plated can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0099] As an example, the positive electrode active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used.

[0100] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0101] As an example, the negative electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, aluminum that is surface silver-plated, stainless steel that is surface silver-plated, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be employed.

[0102] In some embodiments, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0103] As an example, the negative electrode active material can employ a negative electrode active material for a battery that is well known in the art. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative electrode active material can also be used. These negative electrode active materials can be used alone only one or in combination of two or more.

[0104] In some embodiments, the separator is a separator film. The present application does not have a particular limitation on the type of the separator film, and any well-known porous structure separator film having good chemical stability and mechanical stability can be used.

[0105] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes.

[0106] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0107] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0108] In some embodiments, the electrode assembly is in a stack structure.

[0109] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0110] In some embodiments, the housing includes an end cap and a shell body, the shell body is provided with an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly and the electrolyte, etc. The shell body can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0111] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab, or can be indirectly connected to the tab through an adapter. The electrode terminal can be provided on the end cap or on the shell body.

[0112] In some embodiments, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cell.

[0113] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, the housing can function to protect the electrode assembly and prevent leakage of the electrolyte, etc. When the housing is a non-sealed structure, the housing can function to protect the electrode assembly, and a sealing bag can be further included between the housing and the electrode assembly, the sealing bag being used to encapsulate the electrode assembly and the electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film.

[0114] The development of battery technology needs to consider various design factors, such as performance parameters such as energy density, discharge capacity, charge-discharge rate, and overcurrent capacity.

[0115] In some embodiments, the battery cell includes a housing, an electrode terminal and a first insulating member. The electrode terminal is arranged on a first wall of the housing, and the first insulating member is arranged at least partially between the electrode terminal and the first wall to separate the electrode terminal and the first wall. The electrode terminal includes a main body portion and a protruding portion arranged on the periphery of the main body portion. The main body portion is used to connect with the busbar and the tab, and the protruding portion is used to assemble with the first wall. In order to prevent the electrode terminal from rotating relative to the first wall, a first limiting structure (such as a groove) is usually arranged on the outer periphery of the protruding portion. A second limiting structure corresponding to the first limiting structure is arranged on the first insulating member, and the second limiting structure cooperates with the first limiting structure to limit the rotation of the electrode terminal relative to the first wall. However, since the first limiting structure is arranged on the outer periphery of the protruding portion, the size of the protruding portion protruding from the main body portion is large, thereby occupying a large area in the plane perpendicular to the central axis of the main body portion. In order to facilitate the assembly of the electrode terminal and the first wall, the area of the main body portion in the plane perpendicular to the central axis of the main body portion is small, thereby reducing the flow area of the electrode terminal and the flow capacity of the battery cell.

[0116] In view of this, in order to solve the problem that the flow area of the electrode terminal is small, thereby reducing the flow capacity of the battery cell, the embodiments of the present application provide a battery cell including a housing, an electrode terminal and a first insulating member. The housing includes a first wall; the electrode terminal is arranged on the first wall, and the electrode terminal includes a main body portion and a protruding portion arranged on the periphery of the main body portion; and the first insulating member is arranged at least partially between the electrode terminal and the first wall, and the first insulating member is arranged at least partially around the electrode terminal. The electrode terminal includes a first limiting portion arranged on the periphery of the main body portion, and the first insulating member is provided with a second limiting portion cooperating with the first limiting portion. The area of the main body portion in the plane perpendicular to the central axis of the main body portion is large, and the battery cell has high flow capacity.

[0117] In such a battery cell, the protruding portion is arranged on the periphery of the main body portion, and the first limiting portion is arranged on the periphery of the main body portion, so that the size of the protruding portion protruding from the main body portion can be small, the area of the main body portion in the plane perpendicular to the central axis of the main body portion can be large, the flow area of the main body portion is increased, and the flow capacity of the battery cell is improved. Especially when the electrode terminal is applied to a battery cell with a small thickness, the first limiting portion is arranged on the periphery of the main body portion, the size of the protruding portion protruding from the main body portion is reduced, the area of the main body portion in the plane perpendicular to the central axis of the main body portion is increased, the space utilization of the electrode terminal in the thickness direction of the battery cell is improved, and the flow capacity of the battery cell is further improved.

[0118] The battery monomer or battery device disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device such as a vehicle, a ship or an aircraft. The power supply system of the electric device can be composed of the battery monomer or battery device disclosed in the present application.

[0119] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery monomers or battery devices, for example, a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship and a spacecraft, for example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0120] The following embodiments are described by taking a vehicle as an example for the convenience of description.

[0121] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid vehicle or a range extended vehicle, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000, which is used for the circuit system of the vehicle 1000, for example, the working power demand of the vehicle 1000 during starting, navigation and running.

[0122] The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, the working power demand of the vehicle 1000 during starting, navigation and running.

[0123] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, which replaces or partially replaces fuel or natural gas to provide driving power for the vehicle 1000.

[0124] Please refer to FIG. 2, which is a structural exploded view of a battery device according to some embodiments of the present application. The battery device 100 includes a box 20 and a battery cell 10, and the battery cell 10 is accommodated in the box 20. The box 20 is used to provide a space for accommodating the battery cell 10, and the box 20 can have various structures. In some embodiments, the box 20 can include a first sub-box 21 and a second sub-box 22, and the first sub-box 21 and the second sub-box 22 are overlapped with each other, and the first sub-box 21 and the second sub-box 22 together define a space for accommodating the battery cell 10. The second sub-box 22 can be a hollow structure with one end open, and the first sub-box 21 can be a plate structure, and the first sub-box 21 is overlapped with the open side of the second sub-box 22 to define the space together with the second sub-box 22; the first sub-box 21 and the second sub-box 22 can also be hollow structures with one side open, and the open side of the first sub-box 21 is overlapped with the open side of the second sub-box 22.

[0125] In the battery device 100, the battery cell 10 can be multiple, and the multiple battery cells 10 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 10 are connected in series and in parallel. The multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed connection, and then the multiple battery cells 10 are accommodated in the box 20 as a whole; of course, the battery device 100 can also be that the multiple battery cells 10 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and then the whole is accommodated in the box 20. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 10.

[0126] The battery cell 10 can be a secondary battery or a primary battery; the battery cell 10 can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0127] Please refer to FIG. 3, which is a structural exploded view of a battery cell according to some embodiments of the present application. As shown in FIG. 3, the battery cell 10 includes an outer shell 11, an electrode assembly 12, and other functional components. The outer shell 11 includes a shell body 111 and an end cover 112, and the shell body 111 has an opening, and the end cover 112 closes the opening to isolate the internal environment of the battery cell 10 from the external environment.

[0128] The shell 111 is a component for fitting the end cover 112 to form an internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly 12, electrolyte and other components. The shell 111 and the end cover 112 can be independent components. The shell 111 can be of various shapes and sizes. Specifically, the shape of the shell 111 can be determined according to the specific shape and size of the electrode assembly 12. The material of the shell 111 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0129] The end cover 112 refers to a component that covers the opening of the shell 111 to isolate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the end cover 112 can be adapted to the shape of the shell 111 to fit the shell 111. Optionally, the end cover 112 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 112 is not easily deformed when subjected to extrusion and impact, so that the battery cell 10 can have higher structural strength and reliability can also be improved. The end cover 112 can be provided with functional components such as the electrode terminal 13. The electrode terminal 13 can be used to electrically connect with the electrode assembly 12 for outputting or inputting the electrical energy of the battery cell 10. The material of the end cover 112 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specially limited in the embodiments of the present application. In some embodiments, an insulating structure can also be provided on the inner side of the end cover 112, which can be used to isolate the electrical connection components in the shell 111 from the end cover 112 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0130] The electrode assembly 12 is a component in which electrochemical reactions occur in the battery cell 10. One or more electrode assemblies 12 can be contained in the shell 111. The electrode assembly 12 is mainly formed by winding or stacking the positive and negative electrode sheets, and generally has a separator film between the positive and negative electrode sheets, which is used to separate the positive and negative electrode sheets to avoid internal short circuit of the positive and negative electrode sheets. The positive and negative electrode sheets have a portion of active material constituting the main body of the electrode assembly 12, and the positive and negative electrode sheets each have a portion without active material constituting the tab 121. The positive and negative electrode tabs can be located at one end of the main body or at two ends of the main body, respectively.

[0131] Please refer to FIG. 3, and further refer to FIG. 4 to FIG. 6, FIG. 4 is a sectional view of a partial structure of a battery cell provided by some embodiments of the present application, FIG. 5 is a structural schematic view of an electrode terminal provided by some embodiments of the present application, and FIG. 6 is a structural schematic view of a first insulating member provided by some embodiments of the present application. Embodiments of the present application provide a battery cell 10, which comprises a shell 11, an electrode terminal 13, and a first insulating member 14. The shell 11 comprises a first wall 113; the electrode terminal 13 is arranged on the first wall 113, the electrode terminal 13 comprises a main body part 131 and a protruding part 132 arranged on the periphery of the main body part 131; the first insulating member 14 is at least partially arranged between the electrode terminal 13 and the first wall 113, and the first insulating member 14 is at least partially arranged around the electrode terminal 13; wherein the electrode terminal 13 comprises a first limiting part 133 arranged on the periphery of the main body part 131, and the first insulating member 14 is provided with a second limiting part 141 which cooperates with the first limiting part 133.

[0132] The main body part 131 is a part of the electrode terminal 13 for connecting the busbar and the tab, so as to facilitate the flow of current between the tab and the busbar.

[0133] The main body part 131 has a first end surface 131a for connecting the busbar and a second end surface 131b for connecting the tab or the adapter 16; the periphery of the main body part 131 refers to the peripheral surface of the main body part 131 connecting the first end surface 131a and the second end surface 131b.

[0134] In some embodiments, the main body part 131 can be in a cylindrical shape, so as to facilitate the processing and manufacturing.

[0135] The protruding part 132 is used for the cooperation between the electrode terminal 13 and the first wall 113, so as to facilitate the assembly of the electrode terminal 13 and the first wall 113. The protruding part 132 protrudes from the periphery of the main body part 131, and the protruding part 132 can be a protruding structure arranged on the peripheral surface of the main body part 131. In the thickness direction Z of the first wall, the protruding part 132 is located between the first end surface 131a and the second end surface 131b. The protruding part 132 can extend in a direction away from the central axis P of the main body part. The central axis P of the main body part can be parallel to the thickness direction Z of the first wall.

[0136] The first insulating member 14 is a component for insulating and isolating the electrode terminal 13 and the first wall 113, and the material of the first insulating member 14 can be plastic or rubber.

[0137] The first insulating member 14 is at least partially arranged between the electrode terminal 13 and the first wall 113, and the first insulating member 14 is at least partially arranged around the electrode terminal 13, so as to separate the electrode terminal 13 and the first wall 113.

[0138] The first limiting part 133 is a limiting structure arranged on the circumferential side of the main body part 131, and the second limiting part 141 is a limiting structure arranged on the first insulating part 14. The second limiting part 141 cooperates with the first limiting part 133 to limit the rotation of the electrode terminal 13 relative to the first wall 113 about the central axis of the electrode terminal 13. The central axis of the electrode terminal 13 can coincide with the central axis P of the main body part. For the convenience of description, the central axis of the electrode terminal 13 is described by using the central axis P of the main body part in the embodiments of the present application.

[0139] The cooperation between the second limiting part 141 and the first limiting part 133 means that the profile of the second limiting part 141 matches the profile of the first limiting part 133. After the first insulating part 14 is assembled with the electrode terminal 13, the second limiting part 141 cooperates with the first limiting part 133, and the second limiting part 141 interacts with the first limiting part 133 to prevent rotation and limit the rotation of the electrode terminal 13 relative to the first wall 113. For example, the first limiting part 133 can be a protrusion, and the second limiting part 141 can be a groove; or the first limiting part 133 can be a groove, and the second limiting part 141 can be a protrusion.

[0140] The number of the first limiting part 133 can be one or multiple, so as to limit the rotation of the electrode terminal 13 relative to the first wall 113 after the cooperation between the first limiting part 133 and the second limiting part 141.

[0141] According to the battery monomer 10 of the embodiments of the present application, the second limiting part 141 cooperates with the first limiting part 133 to limit the rotation of the electrode terminal 13 relative to the first wall 113. The first limiting part 133 is arranged on the circumferential side of the main body part 131. In the case of meeting the anti-rotation cooperation between the electrode terminal 13 and the first insulating part 14, the size of the protrusion part 132 protruding from the main body part 131 can be reduced, and the area of the main body part 131 in the plane perpendicular to the central axis P of the main body part can be increased, so as to improve the overcurrent capacity of the battery monomer 10. Especially when applied to a battery monomer 10 with a small thickness, the first limiting part 133 is arranged on the circumferential side of the main body part 131, the size of the protrusion part 132 protruding from the main body part 131 is reduced, and the area of the main body part 131 in the plane perpendicular to the central axis P of the main body part is increased. Therefore, the space utilization of the electrode terminal 13 in the thickness direction of the battery monomer 10 can be improved, and the overcurrent capacity of the battery monomer 10 can be improved.

[0142] According to some embodiments of the present application, the number of the electrode terminal 13 is two, which are a positive electrode terminal and a negative electrode terminal. The tab 121 of the electrode assembly 12 includes a positive tab and a negative tab. The positive tab is electrically connected to the positive electrode terminal, and the negative tab is electrically connected to the negative electrode terminal. The electrode terminal 13 not limited in the embodiments of the present application can be a positive electrode terminal or a negative electrode terminal.

[0143] Please refer to FIG. 4 and FIG. 5, according to some embodiments of the present application, the first limiting portion 133 is connected to the protruding portion 132 along the thickness direction Z of the first wall.

[0144] The "first limiting portion 133 is connected to the protruding portion 132" means that the first limiting portion 133 extends to the protruding portion 132 towards the inside of the battery monomer 10 along the thickness direction Z of the first wall.

[0145] When the first limiting portion 133 is a protrusion protruding from the circumferential side of the main body portion 131, the first limiting portion 133 is connected to the protruding portion 132, which can improve the overall strength of the electrode assembly 12.

[0146] Compared with the first limiting portion 133 not being connected to the protruding portion 132, the first limiting portion 133 is connected to the protruding portion 132, which can increase the size of the first limiting portion 133 along the thickness direction Z of the first wall, so as to increase the connection area of the first insulating piece 14 and the electrode terminal 13.

[0147] In the above scheme, the first limiting portion 133 extends to the protruding portion 132 along the thickness direction Z of the first wall, so that the first insulating piece 14 and the electrode terminal 13 have a larger connection area, which can enhance the anti-rotation effect of the first insulating piece 14 on the electrode terminal 13.

[0148] Please refer to FIG. 4 to FIG. 6, according to some embodiments of the present application, the first limiting portion 133 is a first protrusion 134, the second limiting portion 141 is a first recess 142, and at least a part of the first protrusion 134 is embedded in the first recess 142.

[0149] The first protrusion 134 protrudes from the circumferential side of the main body portion 131, the first recess 142 is formed on the surface of the first insulating piece 14 facing the main body portion 131, and the profile of the first protrusion 134 matches the profile of the first recess 142, so that at least a part of the first protrusion 134 can be embedded in the first recess 142.

[0150] When the first insulating piece 14 and the electrode terminal 13 are assembled, a part of the first protrusion 134 can be embedded in the first recess 142, or the entire first protrusion 134 can be embedded in the first recess 142.

[0151] When the first protrusion 134 is connected to the protruding portion 132, the first protrusion 134 connects the main body portion 131 and the protruding portion 132, and the main body portion 131, the first protrusion 134 and the protruding portion 132 can be integrally formed, or the first protrusion 134 is welded to the main body portion 131 and the protruding portion 132, which can enhance the overall strength of the electrode terminal 13.

[0152] In some embodiments, the first protrusion 134 is integrally formed with the body portion 131, facilitating processing and manufacturing.

[0153] In the above scheme, the first limiting portion 133 is the first protrusion 134, which can enhance the overall strength of the electrode terminal 13; the first protrusion 134 cooperates with the first groove 142, facilitating processing and assembly, and having a good anti-rotation effect.

[0154] Please refer to FIG. 4, according to some embodiments of the present application, the surface of the first protrusion 134 away from the body portion 131 does not exceed the outer circumferential surface of the protruding portion 132.

[0155] The outer circumferential surface of the protruding portion 132 refers to the surface of the protruding portion 132 away from the central axis P of the body portion, and is distributed around the central axis P of the body portion.

[0156] The "surface of the first protrusion 134 away from the body portion 131 does not exceed the outer circumferential surface of the protruding portion 132" means that the dimension between the surface of the first protrusion 134 away from the body portion 131 and the central axis P of the body portion is less than or equal to the dimension between the outer circumferential surface of the protruding portion 132 and the central axis P of the body portion. For example, as viewed in the thickness direction Z of the first wall, the orthographic projection of the first protrusion 134 falls within the orthographic projection of the protruding portion 132.

[0157] In the above scheme, the surface of the first protrusion 134 away from the central axis P of the body portion does not exceed the outer circumferential surface of the protruding portion 132, so that the first protrusion 134 occupies less space in the plane perpendicular to the central axis P of the body portion, so that the first insulating piece 14 has higher overall strength.

[0158] Please refer to FIG. 5 and FIG. 6, according to some embodiments of the present application, the number of first limiting portions 133 and the number of second limiting portions 141 are both multiple, the multiple first limiting portions 133 are arranged at intervals in the circumferential direction of the electrode terminal 13, and the second limiting portions 141 correspond one-to-one to the first limiting portions 133.

[0159] The multiple first limiting portions 133 are arranged at intervals around the central axis P of the body portion on the circumferential side of the body portion 131, for example, in the circumferential direction of the electrode terminal 13, the angle between any two adjacent first limiting portions 133 is equal.

[0160] The multiple second limiting portions 141 are arranged at intervals around the central axis P of the body portion, and each second limiting portion 141 corresponds to one first limiting portion 133.

[0161] In the above scheme, the number of first limiting portions 133 and the number of second limiting portions 141 are both multiple, so as to form anti-rotation cooperation at multiple positions in the circumferential direction of the electrode terminal 13, and improve the anti-rotation effect on the electrode terminal 13.

[0162] Please refer to FIG. 4, according to some embodiments of the present application, the first wall 113 comprises a wall portion 114 and a connecting portion 115 connected with each other, the connecting portion 115 is arranged at least partially around the electrode terminal 13, and the connecting portion 115 is used for fixing the electrode terminal 13 to the wall portion 114; at least a part of the protruding portion 132 is arranged between the wall portion 114 and the connecting portion 115 along the thickness direction of the wall portion 114.

[0163] The wall portion 114 and the connecting portion 115 are two parts constituting the first wall 113, the wall portion 114 can be the base body of the first wall 113, and the connecting portion 115 can be a component used for fixing the electrode terminal 13 to the wall portion 114. The connecting portion 115 can be integrally formed with the wall portion 114, or the connecting portion 115 can be fixed to the wall portion 114 by welding.

[0164] The connecting portion 115 can be in the shape of a ring arranged around the circumference of the electrode terminal 13, or the connecting portion 115 can have an arc surface arranged around the circumference of the electrode terminal 13, so that the connecting portion 115 can have a larger mating area with the electrode terminal 13 in the circumferential direction of the electrode terminal 13.

[0165] The thickness direction of the wall portion 114 is parallel to the thickness direction Z of the first wall.

[0166] At least a part of the protruding portion 132 is arranged between the wall portion 114 and the connecting portion 115, and the connecting portion 115 and the wall portion 114 clamp the protruding portion 132 together, so as to fix the protruding portion 132 to the wall portion 114 by the connecting portion 115.

[0167] In the above scheme, the wall portion 114 and the connecting portion 115 clamp the protruding portion 132 together, which has a better constraint effect on the protruding portion 132.

[0168] Please refer to FIG. 7, which is a sectional view of part of the structure of the battery cell provided by some embodiments of the present application. According to some embodiments of the present application, the connecting portion 115 is integrally formed with the wall portion 114.

[0169] The connecting portion 115 and the wall portion 114 are structures made by an integral forming process, such as casting, stamping or milling, etc.

[0170] In the above scheme, the connecting portion 115 is integrally formed with the wall portion 114, which is convenient for processing and manufacturing, and the connecting strength and stability of the connecting portion 115 and the wall portion 114 are higher, which can improve the assembly stability of the connecting portion 115 and the electrode terminal 13.

[0171] Please refer to FIGS. 4-7, according to some embodiments of the present application, the first limiting portion 133 is connected to the protruding portion 132 along the thickness direction of the wall portion 114; the first limiting portion 133 is a first protrusion 134, and the second limiting portion 141 is a first recess 142, and at least a portion of the first protrusion 134 is embedded in the first recess 142.

[0172] The first limiting portion 133 is connected to the protruding portion 132, the first limiting portion 133 can extend from the protruding portion 132 in a direction away from the inside of the battery monomer 10, and the first limiting portion 133 can have a large size in the thickness direction of the wall portion 114, so as to increase the connection area of the first insulating piece 14 and the electrode terminal 13, and improve the anti-rotation effect on the electrode terminal 13.

[0173] The first limiting portion 133 is a first protrusion 134, and the first protrusion 134 can be integrally formed with the main body portion 131, which is convenient for processing and manufacturing.

[0174] In the above scheme, the first limiting portion 133 is a first protrusion 134, and the first protrusion 134 can extend from the protruding portion 132 in a direction away from the inside of the battery monomer 10, which can improve the overall strength of the electrode terminal 13.

[0175] Please refer to FIGS. 4 and 7, according to some embodiments of the present application, the connecting portion 115 and the first limiting portion 133 do not overlap along the thickness direction of the wall portion 114.

[0176] The connecting portion 115 can be away from the central axis P of the main body portion with respect to the first limiting portion 133, and the connecting portion 115 can be arranged towards the protruding portion 132 along the thickness direction of the wall portion 114, so as to reduce the distance between the connecting portion 115 and the protruding portion 132 in the thickness direction of the wall portion 114.

[0177] When the first limiting portion 133 is a first protrusion 134, the connecting portion 115 and the first limiting portion 133 do not overlap along the thickness direction of the wall portion 114, which can reduce the space occupation of the structure after the connecting portion 115 is matched with the electrode terminal 13 in the thickness direction of the wall portion 114, so as to improve the energy density of the battery monomer 10.

[0178] According to some embodiments of the present application, the connecting portion 115 and the first limiting portion 133 can partially overlap along the thickness direction of the wall portion 114, on the one hand, the connecting portion 115 can be arranged towards the protruding portion 132, and on the other hand, the first limiting portion 133 has an increased size in the thickness direction of the wall portion 114, which is convenient for improving the overall strength of the electrode terminal 13.

[0179] Please refer to FIG. 8, which is a schematic diagram of the positional relationship between the first limiting portion and the connecting portion according to some embodiments of the present application. According to some embodiments of the present application, the connecting portion 115 has an overlapping portion 1151 overlapping the protruding portion 132 in the thickness direction of the wall portion 114, the overlapping portion 1151 has a first surface 1151a facing the protruding portion 132, and the first limiting portion 133 is beyond the first surface 1151a in the direction Z1 in which the inner side of the wall portion 114 points to the outer side of the wall portion 114.

[0180] The overlapping portion 1151 is the area in which the connecting portion 115 overlaps the protruding portion 132 in the thickness direction of the wall portion 114. After the electrode terminal 13 is assembled with the first wall 113, the overlapping portion 1151 can limit the movement of the electrode terminal 13 in the thickness direction of the wall portion 114.

[0181] The first surface 1151a is the surface of the overlapping portion 1151 facing the protruding portion 132.

[0182] The inner side of the wall portion 114 refers to the side of the wall portion 114 facing the inside of the battery monomer 10, and the outer side of the wall portion 114 refers to the side of the wall portion 114 away from the inside of the battery monomer 10. For ease of description, the direction Z1 in FIG. 8 is the direction in which the inner side of the wall portion 114 points to the outer side of the wall portion 114.

[0183] In the embodiments in which the first limiting portion 133 is the first protrusion 134 and the connecting portion 115 does not overlap the first limiting portion 133 in the thickness direction of the wall portion 114, the first limiting portion 133 can extend from the protruding portion 132 in the direction away from the inside of the battery monomer 10 in the direction Z1 in which the inner side of the wall portion 114 points to the outer side of the wall portion 114, and the first limiting portion 133 is beyond the first surface 1151a. The size of the first limiting portion 133 in the thickness direction of the wall portion 114 can be large, so as to improve the overall strength of the electrode terminal 13.

[0184] In the above scheme, the first limiting portion 133 is beyond the first surface 1151a. On the one hand, the size of the first limiting portion 133 in the thickness direction of the wall portion 114 can be large, so as to improve the anti-rotation effect on the electrode terminal 13. On the other hand, in the thickness direction of the wall portion 114, the connecting portion 115 can be closer to the protruding portion 132, so as to reduce the space occupation of the structure after the connecting portion 115 is assembled with the electrode terminal 13.

[0185] Please refer to FIG. 9, which is a schematic diagram of the positional relationship between the first limiting portion and the connecting portion according to some other embodiments of the present application. According to some embodiments of the present application, the overlapping portion 1151 further has a second surface 1151b away from the protruding portion 132, and the first limiting portion 133 is beyond the second surface 1151b in the direction Z1 in which the inner side of the wall portion 114 points to the outer side of the wall portion 114.

[0186] The second surface 1151b and the first surface 1151a are distributed at opposite ends of the overlapping portion 115 in the thickness direction of the wall portion 114, and the second surface 1151b is farther from the inside of the battery cell 10 than the first surface 1151a.

[0187] In the embodiment in which the first limiting portion 133 is the first protrusion 134 and the connecting portion 115 does not overlap the first limiting portion 133 in the thickness direction of the wall portion 114, the first limiting portion 133 can extend in a direction away from the inside of the battery cell 10 beyond the second surface 1151b in the direction Z1 from the inside of the wall portion 114 to the outside of the wall portion 114, on the one hand, the size of the first limiting portion 133 in the thickness direction of the wall portion 114 is larger, further improving the anti-rotation effect on the electrode terminal 13, on the other hand, the connecting portion 115 can be closer to the protruding portion 132 in the thickness direction of the wall portion 114, further reducing the space occupation of the structure after the connecting portion 115 is assembled with the electrode terminal 13.

[0188] Please refer to FIG. 10, which is a schematic diagram of the positional relationship between the first limiting portion and the connecting portion according to some embodiments of the present application. According to some embodiments of the present application, the first limiting portion 133 includes a first sub-limiting portion 1331 and a second sub-limiting portion 1332 connected to each other, the second sub-limiting portion 1332 is farther from the central axis P of the main body portion than the first sub-limiting portion 1331, the first sub-limiting portion 1331 extends beyond the second sub-limiting portion 1332 in the direction Z1 from the inside of the wall portion 114 to the outside of the wall portion 114, and the second sub-limiting portion 1332 does not extend beyond the first surface 1151a.

[0189] The first limiting portion 133 is the first protrusion 134, the first sub-limiting portion 1331 and the second sub-limiting portion 1332 are two parts constituting the first protrusion 134, and the first sub-limiting portion 1331 and the second sub-limiting portion 1332 are both connected to the protruding portion 132.

[0190] The first sub-limiting portion 1331 connects the second sub-limiting portion 1332 and the main body portion 131, and the end surface of the first sub-limiting portion 1331 away from the protruding portion 132 extends beyond the end surface of the second sub-limiting portion 1332 away from the protruding portion 132 in the direction Z1 from the inside of the wall portion 114 to the outside of the wall portion 114, so that the height of the first limiting portion 133 and the second sub-limiting portion 1332 in the thickness direction of the wall portion 114 is different.

[0191] The first sub-limiting portion 1331 and the second sub-limiting portion 1332 can be integrally formed.

[0192] The second sub-limiting portion 1332 has a third surface facing away from the main body portion 131 in a direction in which the inner side of the wall portion 114 points to the outer side of the wall portion 114, and the third surface is lower than the first surface 1151a or is flush with the first surface 1151a.

[0193] In the above solution, the first sub-limiting portion 1331 and the second sub-limiting portion 1332 have different heights in the thickness direction of the wall portion 114, and when the first limiting portion 133 is the first protrusion 134 and the first limiting portion 133 is connected with the protruding portion 132, the overall strength of the electrode terminal 13 can be improved; the second sub-limiting portion 1332 does not exceed the first surface 1151a, so that the structure after the connecting portion 115 is matched with the electrode terminal 13 occupies a smaller space in the thickness direction of the wall portion 114. At the same time, the setting of the second sub-limiting portion 1332 can also relieve the stress on the protruding portion 132.

[0194] Please refer to FIG. 7, according to some embodiments of the present application, the first insulating piece 14 is arranged between the electrode terminal 13 and the connecting portion 115, and the first insulating piece 14 separates the electrode terminal 13 and the connecting portion 115.

[0195] The first insulating piece 14 is arranged between the electrode terminal 13 and the connecting portion 115, for example, a part of the first insulating piece 14 is located between the connecting portion 115 and the protruding portion 132, and a part of the first insulating piece 14 is located between the connecting portion 115 and the main body portion 131, thereby separating the electrode terminal 13 and the connecting portion 115.

[0196] In the above solution, the first insulating piece 14 realizes the insulation separation of the electrode terminal 13 and the connecting portion 115, so as to reduce the risk of positive and negative contact short circuit.

[0197] Please refer to FIG. 4 and FIG. 7, according to some embodiments of the present application, the connecting portion 115 and the first insulating piece 14 are both arranged around the electrode terminal 13.

[0198] The connecting portion 115 can have a ring structure around the central axis of the electrode terminal 13, the first insulating piece 14 can have a ring structure around the central axis of the electrode terminal 13, and the first insulating piece 14 is located between the connecting portion 115 and the electrode terminal 13.

[0199] In the above solution, the connecting portion 115 is arranged around the electrode terminal 13, so as to constrain the electrode terminal 13 at any position in the circumferential direction of the electrode terminal 13; the first insulating piece 14 is arranged around the electrode terminal 13, so as to separate the electrode terminal 13 and the connecting portion 115 at any position in the circumferential direction of the electrode terminal 13, thereby improving the insulation effect.

[0200] Please refer to FIG. 6, and further refer to FIG. 11, which is a structural schematic diagram of the connecting part according to some embodiments of the present application. According to some embodiments of the present application, the first insulating part 14 is further provided with a third limiting part 143, and the connecting part 115 is provided with a fourth limiting part 1155 corresponding to the third limiting part 143, and the fourth limiting part 1155 cooperates with the third limiting part 143 to limit the rotation of the first insulating part 14 relative to the first wall 113.

[0201] Optionally, the third limiting part 143 can be a second protrusion, and the fourth limiting part 1155 can be a second groove, at least a part of the second protrusion is embedded in the second groove. The number of the third limiting part 143 and the number of the fourth limiting part 1155 are both plural, and the plural third limiting parts 143 are arranged at intervals around the central axis of the electrode terminal 13, and each third limiting part 143 corresponds to one fourth limiting part 1155.

[0202] According to some embodiments of the present application, the first insulating part 14 is injection molded between the electrode terminal 13 and the connecting part 115.

[0203] Please refer to FIG. 4, according to some embodiments of the present application, the connecting part 115 is welded with the wall part 114 to form a first welding mark 116, and the first welding mark 116 is arranged around the electrode terminal 13.

[0204] The connecting part 115 and the wall part 114 are connected by welding, so that the connecting part 115 and the wall part 114 are firmly connected, for example, the connecting part 115 and the wall part 114 can be laser welded.

[0205] The first welding mark 116 is a structure formed after the connecting part 115 and the wall part 114 are welded, and the first welding mark 116 is arranged around the electrode terminal 13. When the connecting part 115 and the wall part 114 are welded, they can be welded around the electrode terminal 13 once to form a ring-shaped first welding mark 116.

[0206] In the above scheme, the connecting part 115 and the wall part 114 are welded, which improves the connection stability of the connecting part 115 and the wall part 114, and the first welding mark 116 is arranged around the electrode terminal 13, which improves the connection reliability of the connecting part 115 and the wall part 114.

[0207] Please refer to FIG. 12, which is a schematic diagram of part of the structure of the battery monomer according to some embodiments of the present application. According to some embodiments of the present application, the wall part 114 has two first edges 1141 oppositely arranged along the width direction X thereof, and the minimum distance between the first welding mark 116 and the first edge 1141 along the width direction X is greater than or equal to 1 mm and less than or equal to 5 mm.

[0208] In some embodiments, the first wall 113 can be a cuboid, the width direction X of the wall portion 114 can be parallel to the width direction of the first wall 113, and the width direction X of the wall portion 114 can be parallel to the thickness direction of the battery cell 10. The length direction Y of the wall portion 114 can be parallel to the length direction of the first wall 113, and the length direction Y of the wall portion 114 can be parallel to the length direction of the battery cell 10.

[0209] In the embodiments in which the first wall 113 is the end cover 112, the end cover 112 is welded to the shell 111. When the end cover 112 is located outside the opening of the shell 111, the first edge 1141 is the outer edge of the end cover 112 in the width direction X thereof; when the end cover 112 is embedded in the opening of the shell 111, the end cover 112 is welded at the opening of the shell 111, and the first edge 1141 is the edge of the second welding mark formed after the end cover 112 is welded to the shell 111. At this time, the minimum distance between the first welding mark 116 and the first edge 1141 refers to the minimum distance between the first welding mark 116 and the second welding mark.

[0210] For ease of description, the dimension indicated by the letter M in FIG. 12 can be the minimum distance between the first welding mark 116 and the first edge 1141 in the width direction X.

[0211] For example, the minimum distance between the first welding mark 116 and the first edge 1141 in the width direction X can be, but is not limited to, any one value or a range between any two values selected from 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, and 5 mm.

[0212] In the above scheme, the size of the electrode terminal 13 in the thickness direction of the battery cell 10 can be increased while the thickness of the battery cell 10 remains unchanged, and the space utilization of the electrode terminal 13 in the thickness direction of the battery cell 10 is improved, so as to increase the overcurrent capacity; or the thickness of the battery cell 10 can be reduced while the size of the electrode terminal 13 in the thickness direction of the battery cell 10 remains unchanged, so as to meet the overcurrent requirement of the battery cell 10 with a relatively small thickness.

[0213] According to some embodiments of the present application, the width of the first wall 113 is greater than or equal to 15 mm and less than or equal to 40 mm.

[0214] For ease of description, the dimension indicated by the letter W in FIG. 12 can be the width of the first wall 113. The width of the first wall 113 can be the width of the wall portion 114.

[0215] The width of the first wall 113 can be, but is not limited to, any one of 15 mm, 18 mm, 20 mm, 22 mm, 25 mm, 28 mm, 30 mm, 32 mm, 35 mm, 38 mm, 40 mm or a range between any two of them.

[0216] In the above scheme, the width direction of the first wall 113 can be parallel to the thickness direction of the battery cell 10, the width of the first wall 113 satisfies the above range, the battery cell 10 has a thinner thickness, the size of the protruding part 132 protruding from the main part 131 is reduced, and the battery cell 10 with a thinner thickness can be adapted.

[0217] Please refer to FIG. 13, which is a cross-sectional view of a partial structure of a battery cell according to some embodiments of the present application. According to some embodiments of the present application, the connecting part 115 includes a first section 1152, which is located on one side of the wall part 114 along the thickness direction of the wall part 114. The first section 1152 includes a main part 1152a and a thinning part 1152b connected to each other. Along the thickness direction of the wall part 114, the surface of the thinning part 1152b facing the wall part 114 is farther away from the wall part 114 than the surface of the main part 1152a facing the wall part 114, so as to form a thinning groove 1152c on the side of the first section 1152 facing the wall part 114. A part of the protruding part 132 is located between the thinning part 1152b and the wall part 114, and the first insulating part 14 is partially accommodated in the thinning groove 1152c.

[0218] The connecting part 115 can be a bent structure, and the connecting part 115 can further include a second section and a third section. The second section and the third section are located on the outer circumferential side of the first section 1152. The third section is away from the central axis P of the main part with respect to the first section 1152. The second section connects the third section and the first section 1152. The first section 1152 is away from the inside of the battery cell 10 with respect to the third section.

[0219] The thinning part 1152b and the main part 1152a are two regions constituting the first section 1152. The thinning part 1152b is closer to the central axis P of the main part with respect to the main part 1152a. The thinning part 1152b can be a region with a thickness reduced compared to the main part 1152a.

[0220] The thickness of the thinning part 1152b is smaller than the thickness of the main part 1152a, and a step is formed between the thinning part 1152b and the main part 1152a, so as to form the thinning groove 1152c on the side of the first section 1152 facing the wall part 114.

[0221] Along the thickness direction of the wall part 114, the thinning part 1152b partially overlaps with the protruding part 132, so that a part of the protruding part 132 is located between the thinning part 1152b and the wall part 114.

[0222] The first insulating member 14 is partially accommodated in the thinning groove 1152c, so that the first insulating member 14 separates the protruding portion 132 and the thinning area 1152b.

[0223] In the above scheme, a part of the protruding portion 132 is located between the thinning area 1152b and the wall portion 114, and the connecting portion 115 is clamped with the wall portion 114 in the thickness direction of the wall portion 114 to facilitate the assembly of the electrode terminal 13 to the wall portion 114; the thickness of the thinning area 1152b is thinned relative to the thickness of the main body area 1152a, which can reduce the space occupied by the connecting portion 115 after being assembled with the electrode terminal 13, improve the space utilization of the battery monomer 10 in the thickness direction of the wall portion 114, and help to improve the energy density of the battery monomer 10; and the first insulating member 14 is partially accommodated in the thinning groove 1152c, which meets the requirements of insulating and isolating the thinning area 1152b and the electrode terminal 13.

[0224] Please refer to FIG. 14, which is a structural schematic diagram of the connecting portion provided by some embodiments of the present application. According to some embodiments of the present application, the connecting portion 115 includes a first sub-connecting portion 1153 and a second sub-connecting portion 1154 connected to each other, the first sub-connecting portion 1153 is connected to the wall portion 114, and the hardness of the second sub-connecting portion 1154 is greater than that of the first sub-connecting portion 1153.

[0225] The first sub-connecting portion 1153 and the second sub-connecting portion 1154 are two components, the material of the first sub-connecting portion 1153 is different from that of the second sub-connecting portion 1154, and the first sub-connecting portion 1153 and the second sub-connecting portion 1154 can be stacked to reduce the space occupation.

[0226] The connecting mode of the first sub-connecting portion 1153 and the second sub-connecting portion 1154 can be various, for example, press-fit connection, welding, riveting, etc. Optionally, the first sub-connecting portion 1153 and the second sub-connecting portion 1154 are welded, so that the first sub-connecting portion 1153 and the second sub-connecting portion 1154 are firmly connected.

[0227] In the above scheme, the connecting portion 115 is used to fix the electrode terminal 13 to the wall portion 114, the hardness of the second sub-connecting portion 1154 is greater than that of the first sub-connecting portion 1153, which can improve the overall strength of the connecting portion 115 and improve the anti-deformation ability of the connecting portion 115 to have a better constraint effect on the electrode terminal 13.

[0228] Please refer to FIG. 12, according to some embodiments of the present application, the width of the first wall 113 is W, and the size of the main body portion 131 in the width direction of the first wall 113 is D, which satisfies 0.3*W≤D≤0.8*W.

[0229] The width of the first wall 113 can be a dimension of the outer shell 11 in the width direction of the first wall 113.

[0230] The dimension of the main body portion 131 in the width direction of the first wall 113 can affect the flow area of the main body portion 131.

[0231] In some embodiments, D can be, but is not limited to, any one of 0.3*W, 0.4*W, 0.5*W, 0.6*W, 0.7*W, 0.8*W or a range between any two of them.

[0232] In the above scheme, the dimension of the main body portion 131 in the width direction of the first wall 113 satisfies the above range, so that the main body portion 131 has a larger flow area, the battery monomer 10 has a better flow effect, and the assembly of the electrode terminal 13 and the first wall 113 is facilitated.

[0233] Please refer to FIG. 4. According to some embodiments of the present application, the first wall 113 is provided with an electrode lead-out hole 1131, and the electrode terminal 13 covers the electrode lead-out hole 1131; the first insulating member 14 is arranged along the circumference of the electrode lead-out hole 1131, and at least a part of the first insulating member 14 is arranged between the protruding portion 132 and the first wall 113 along the thickness direction Z of the first wall; a part of the main body portion 131 is arranged in the electrode lead-out hole 1131, and the battery monomer 10 further comprises a sealing member 15, which is arranged along the circumference of the electrode lead-out hole 1131, and at least a part of the sealing member 15 is arranged between the protruding portion 132 and the first wall 113 along the thickness direction Z of the first wall.

[0234] The electrode lead-out hole 1131 can be a through hole arranged in the first wall 113, and the electrode lead-out hole 1131 penetrates the first wall 113 along the thickness direction Z of the first wall, so as to realize the electrical connection between the electrode terminal 13 and the tab.

[0235] The electrode terminal 13 covering the electrode lead-out hole 1131 means that the protruding portion 132 and the main body portion 131 cooperate to cover the electrode lead-out hole 1131. For example, a part of the protruding portion 132 and the main body portion 131 is located outside the wall portion 114, the protruding portion 132 and the main body portion 131 cooperate to cover the electrode lead-out hole 1131, and another part of the main body portion 131 extends into the electrode lead-out hole 1131.

[0236] A part of the first insulating member 14 is arranged between the protruding portion 132 and the first wall 113, or the entire first insulating member 14 is arranged between the protruding portion 132 and the first wall 113, so as to separate the electrode terminal 13 and the first wall 113.

[0237] A part of the main body portion 131 is arranged in the electrode lead-out hole 1131, so as to realize the positioning of the electrode terminal 13.

[0238] The sealing member 15 can be a sealing ring, which can be elastically deformed to form a seal between the protruding portion 132 and the first wall 113 after the electrode terminal 13 is assembled with the first wall 113.

[0239] In the above scheme, the electrode lead-out hole 1131 is arranged to facilitate the assembly of the electrode terminal 13 with the first wall 113 and the electrical connection of the electrode terminal 13 with the tab; the first insulating member 14 is arranged along the circumference of the electrode lead-out hole 1131 and is annular to facilitate the insulation and isolation of the electrode terminal 13 and the first wall 113 at any position in the circumference of the electrode terminal 13; the protruding portion 132 cooperates with the main body portion 131 to cover the electrode lead-out hole 1131, and at least a part of the sealing member 15 is arranged between the protruding portion 132 and the first wall 113 to realize the sealing cooperation of the protruding portion 132 and the first wall 113, thereby reducing the risk of the outflow of electrolyte and other substances from the electrode lead-out hole 1131.

[0240] Please refer to FIG. 3 and FIG. 15, which is a structural schematic diagram of an electrode terminal according to some embodiments of the present application. According to some embodiments of the present application, the battery monomer 10 further comprises an electrode assembly 12 having a tab 121; the electrode terminal 13 comprises a first portion 135 and a second portion 136 connected with each other, the first portion 135 and the second portion 136 are arranged in a stacking manner along the thickness direction Z of the first wall, the first portion 135 is used to connect with the busbar member, the second portion 136 is used to connect with the tab 121, the material of the first portion 135 is different from the material of the second portion 136; the first portion 135 comprises a first main body portion 1351 and a first protruding portion 1352, the first protruding portion 1352 protrudes from the circumferential side of the first main body portion 1351, the first main body portion 1351 constitutes a part of the main body portion 131, the first protruding portion 1352 constitutes a part of the protruding portion 132, and the first limiting portion 133 is arranged on the first main body portion 1351.

[0241] The first portion 135 and the second portion 136 are two portions constituting the electrode terminal 13, the first portion 135 is used to connect with the busbar member, and the second portion 136 is used to connect with the tab 121, so as to realize the electrical connection between the busbar member and the tab 121 made of different materials.

[0242] The material of the first portion 135 can be the same as that of the busbar member, so as to facilitate the welding of the first portion 135 with the busbar member and improve the connection firmness of the first portion 135 with the busbar member; the material of the second portion 136 can be the same as that of the tab 121, so as to facilitate the welding of the second portion 136 with the tab 121 and improve the connection firmness of the second portion 136 with the tab 121.

[0243] The first body part 1351 constitutes a part of the body part 131, and is away from the inside of the battery cell 10 relative to the second part 136 so as to be connected with the busbar member.

[0244] The first protruding part 1352 protrudes from the circumferential side of the first body part 1351 so as to be clamped by the connecting part 115 and the wall part 114 in cooperation, and the connecting part 115 fixes the electrode terminal 13 to the wall part 114.

[0245] The first limiting part 133 is arranged on the circumferential side of the first body part 1351, and for example, the first limiting part 133 can be integrally formed with the first body part 1351 so as to be manufactured by machining.

[0246] In some embodiments, the first body part 1351 can be in a cylindrical shape, and the central axis P of the first body part can coincide with the central axis P of the body part.

[0247] In some embodiments, the first protruding part 1352 can be arranged around the circumference of the first body part 1351.

[0248] In the above scheme, the first part 135 and the second part 136 are made of different materials so as to be connected with the busbar member through the first part 135 and connected with the tab 121 through the second part 136, thereby meeting the assembly requirements of the electrode terminal 13 with the busbar member and the tab 121.

[0249] Please refer to FIG. 15, according to some embodiments of the present application, the second part 136 includes a second body part 1361 and a second protruding part 1362, the second protruding part 1362 protrudes from the circumferential side of the second body part 1361, the second body part 1361 and the first body part 1351 constitute the body part 131, the second protruding part 1362 and the first protruding part 1352 constitute the protruding part 132, and along the thickness direction Z of the first wall, the first protruding part 1352 completely overlaps the second protruding part 1362.

[0250] The second body part 1361 and the first body part 1351 constitute the body part 131, and the second body part 1361 is connected with the first body part 1351, for example, the second body part 1361 can be welded, hot-melt connected or the like with the first body part 1351.

[0251] In some embodiments, the second body part 1361 can be in a cylindrical shape, and the central axis P of the second body part can coincide with the central axis P of the body part.

[0252] The second protruding part 1362 protrudes from the peripheral side of the second body part 1361, the second protruding part 1362 is connected with the first protruding part 1352, and the second protruding part 1362 and the first protruding part 1352 form the protruding part 132, so that the protruding part 132 has high strength. The second protruding part 1362 can be welded, hot-melt connected, or the like with the first protruding part 1352.

[0253] The first protruding part 1352 and the second protruding part 1362 completely overlap in the thickness direction Z of the first wall, and the first protruding part 1352 and the second protruding part 1362 have a large connection area.

[0254] In the above scheme, the second body part 1361 is connected with the first body part 1351 to form the body part 131, and the second protruding part 1362 is connected with the first protruding part 1352 to form the protruding part 132, which not only facilitates processing and manufacturing, but also makes the electrode terminal 13 have high overall strength.

[0255] According to some embodiments of the present application, the material of the first part 135 is aluminum, and the material of the second part 136 is copper.

[0256] In the above scheme, the material of the first part 135 is aluminum, which on the one hand reduces cost and on the other hand facilitates connection with the busbar member; and the material of the second part 136 is copper, which facilitates welding with the tab 121. For example, when the material of the negative tab 121 is copper, the material of the second part 136 is copper, which facilitates welding of the electrode terminal 13 with the negative tab 121. The material of the first part 135 is aluminum, which means that the base material of the first part 135 is aluminum, for example, the first part 135 can be pure aluminum or can also be an aluminum alloy.

[0257] Please refer to FIG. 3, according to some embodiments of the present application, the shell 11 includes a housing 111 and an end cover 112, the housing 111 has an opening, and the end cover 112 covers the opening, and the end cover 112 is the first wall 113.

[0258] In the above scheme, the end cover 112 is the first wall 113, which facilitates assembly of the electrode terminal 13 with the first wall 113 and assembly of the electrode terminal 13 with the electrode assembly 12.

[0259] Please refer to FIG. 4, according to some embodiments of the present application, the battery monomer 10 further includes a second insulating piece 17, the second insulating piece 17 is arranged on the inner side of the first wall 113, and the second insulating piece 17 is used for insulating and isolating the first wall 113 from the internal conductive piece of the battery monomer 10, which can include the adapter 16 or the electrode assembly 12 (such as the tab 121).

[0260] According to some embodiments of the present application, the embodiments of the present application further provide a battery device 100 comprising the battery cell 10 provided according to any of the above embodiments.

[0261] According to some embodiments of the present application, the embodiments of the present application further provide a battery device 100 comprising the battery cell 10 provided according to any of the above embodiments.

[0262] The battery cell 10 or the battery device 100 can be used as a power supply for any of the above-mentioned devices or systems.

[0263] According to some embodiments of the present application, referring to FIGS. 3-15, the embodiments of the present application provide a battery cell 10 comprising a housing 11, an electrode terminal 13, a first insulating member 14, and a sealing member 15.

[0264] The housing 11 comprises a shell 111 and an end cover 112, the shell 111 has an opening, and the end cover 112 covers the opening and is a first wall 113. The first wall 113 comprises a wall portion 114 and a connecting portion 115, and the connecting portion 115 is welded to the wall portion 114. The wall portion 114 is provided with an electrode lead-out hole 1131, and the electrode lead-out hole 1131 penetrates the wall portion 114 along a thickness direction Z of the first wall. The connecting portion 115 is annular, and the connecting portion 115 is arranged around the electrode terminal 13.

[0265] The electrode terminal 13 comprises a main body portion 131 and a protruding portion 132 arranged on the periphery of the main body portion 131, a part of the main body portion 131 and the protruding portion 132 are located outside the wall portion 114, the protruding portion 132 and the main body portion 131 cover the electrode lead-out hole 1131, and the other part of the main body portion 131 extends into the electrode lead-out hole 1131. The electrode terminal 13 further comprises a first limiting portion 133 arranged on the periphery of the main body portion 131, and the first limiting portion 133 is connected to the protruding portion 132 along the thickness direction Z of the first wall. The first limiting portion 133 is a first protrusion 134.

[0266] Along the thickness direction of the wall portion 114, the connecting portion 115 does not overlap the first limiting portion 133, and the connecting portion 115 can be arranged close to the protruding portion 132, so that the space occupied by the structure after the connecting portion 115 and the electrode terminal 13 are assembled in the thickness direction of the wall portion 114 is small. Along the direction from the inner side of the wall portion 114 to the outer side, the first limiting portion 133 exceeds the first surface 1151a of the connecting portion 115, and the size of the first limiting portion 133 in the thickness direction of the wall portion 114 is large, so as to improve the overall strength of the electrode terminal 13.

[0267] The first insulating member 14 is arranged around the electrode terminal 13, and is arranged between the electrode terminal 13 and the connecting portion 115 to separate the electrode terminal 13 and the connecting portion 115. The first insulating member 14 is provided with a second limiting portion 141, which is a first groove 142, and cooperates with the first limiting portion 133 to limit the rotation of the electrode terminal 13 relative to the first wall 113.

[0268] According to the battery monomer 10 of the embodiment of the present application, the first limiting portion 133 is arranged on the peripheral side of the main body portion 131, and in the case of meeting the anti-rotation cooperation of the electrode terminal 13 and the first insulating member 14, the size of the protruding portion 132 protruding from the main body portion 131 can be reduced, and the area of the main body portion 131 in the plane perpendicular to the central axis P of the main body portion can be increased, so as to facilitate the improvement of the overcurrent capacity of the battery monomer 10. In particular, when applied to a battery monomer 10 with a relatively small thickness, the first limiting portion 133 is arranged on the peripheral side of the main body portion 131, the size of the protruding portion 132 protruding from the main body portion 131 is reduced, and the area of the main body portion 131 in the plane perpendicular to the central axis P of the main body portion is increased, so as to improve the space utilization of the electrode terminal 13 in the thickness direction of the battery monomer 10, and further improve the overcurrent capacity of the battery monomer 10. In the thickness direction Z of the first wall, the first limiting portion 133 is connected with the protruding portion 132, and the first limiting portion 133 is a first protrusion 134, so as to improve the overall strength of the electrode terminal 13.

[0269] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present application, and equivalent substitutions can be made to the components thereof. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The application relates to a battery shell, comprising: a shell comprising a first wall; an electrode terminal arranged on the first wall, the electrode terminal comprising a main body portion and a protruding portion arranged on the periphery of the main body portion; a first insulating member arranged at least partially between the electrode terminal and the first wall, and the first insulating member being arranged at least partially around the electrode terminal; wherein the electrode terminal comprises a first limiting portion arranged on the periphery of the main body portion, and the first insulating member is provided with a second limiting portion which cooperates with the first limiting portion.

2. The battery cell of claim 1, wherein, The first limiting portion is connected to the protruding portion in the thickness direction of the first wall.

3. The battery cell according to claim 1 or 2, characterized in that, The first limiting portion is a first protrusion, and the second limiting portion is a first recess, and at least a part of the first protrusion is embedded in the first recess.

4. The battery cell of claim 3, wherein, The surface of the first protrusion away from the main body portion does not exceed the outer peripheral surface of the protruding portion.

5. The battery cell of any one of claims 1-4, wherein, The number of the first limiting portions and the number of the second limiting portions are both plural, and the plural first limiting portions are arranged at intervals in the circumferential direction of the electrode terminal, and the second limiting portions correspond to the first limiting portions one by one.

6. The battery cell of any one of claims 1-5, wherein, The first wall comprises a wall portion and a connecting portion connected to each other, the connecting portion is arranged at least partially around the electrode terminal, and the connecting portion is used for fixing the electrode terminal to the wall portion; In the thickness direction of the wall portion, at least a part of the protruding portion is arranged between the wall portion and the connecting portion.

7. The battery cell of claim 6, wherein, The connecting portion is integrally formed with the wall portion.

8. The battery cell according to claim 6 or 7, characterized in that In the thickness direction of the wall portion, the first limiting portion is connected to the protruding portion; The first limiting portion is a first protrusion, and the second limiting portion is a first recess, and at least a part of the first protrusion is embedded in the first recess.

9. The battery cell of claim 8, wherein, In the thickness direction of the wall portion, the connecting portion does not overlap with the first limiting portion.

10. The battery cell according to claim 8 or 9, characterized in that The connecting portion has an overlapping portion which overlaps with the protruding portion in the thickness direction of the wall portion, the overlapping portion has a first surface facing the protruding portion, and the first limiting portion exceeds the first surface in the direction of the inner side of the wall portion to the outer side of the wall portion.

11. The battery cell of claim 10, wherein, The overlapping portion also has a second surface away from the protruding portion, and the first limiting portion exceeds the second surface in the direction of the inner side of the wall portion to the outer side of the wall portion.

12. The battery cell according to claim 10 or 11, characterized in that The first limiting portion comprises a first sub-limiting portion and a second sub-limiting portion connected to each other, the second sub-limiting portion is farther away from the central axis of the main body portion than the first sub-limiting portion in the direction of the inner side of the wall portion to the outer side of the wall portion, the first sub-limiting portion exceeds the second sub-limiting portion, and the second sub-limiting portion does not exceed the first surface.

13. The battery cell of any one of claims 6-12, wherein, The first insulating member is arranged between the electrode terminal and the connecting portion, and the first insulating member separates the electrode terminal and the connecting portion.

14. The battery cell of claim 13, wherein, The connecting portion and the first insulating member are both arranged around the electrode terminal.

15. The battery cell of claim 6, wherein, The connecting portion is welded with the wall portion to form a first welding mark, and the first welding mark is arranged around the electrode terminal.

16. The battery cell of claim 15, wherein, The wall portion has two first edges arranged opposite along a width direction of the wall portion, and a minimum distance between the first weld mark and the first edge along the width direction is greater than or equal to 1 mm and less than or equal to 5 mm.

17. The battery cell of claim 16, wherein, The first wall has a width greater than or equal to 15 mm and less than or equal to 40 mm.

18. The battery cell of any one of claims 6-17, wherein, The connecting portion includes a first segment located on one side of the wall portion along a thickness direction of the wall portion. The first segment includes a main body region and a thinning region connected to each other, and the thinning region faces further away from the wall portion than the main body region along the thickness direction of the wall portion, so as to form a thinning groove on the side of the first segment facing the wall portion, a part of the protruding portion is located between the thinning region and the wall portion, and the first insulating member is partially accommodated in the thinning groove.

19. The battery cell of any one of claims 6-18, wherein, The connecting portion includes a first sub-connecting portion and a second sub-connecting portion connected to each other, the first sub-connecting portion is connected to the wall portion, and the second sub-connecting portion has a hardness greater than that of the first sub-connecting portion.

20. The battery cell of any one of claims 1-19, wherein, The first wall has a width W, and the main body portion has a dimension D in the width direction of the first wall, and 0.3*W≤D≤0.8*W is satisfied.

21. The battery cell of any one of claims 1-20, wherein, The first wall is provided with an electrode lead-out hole, and the electrode terminal covers the electrode lead-out hole. The first insulating member is arranged along a circumferential direction of the electrode lead-out hole, and at least a part of the first insulating member is arranged between the protruding portion and the first wall along a thickness direction of the first wall. A part of the main body portion is arranged in the electrode lead-out hole, and the battery monomer further includes a sealing member arranged along a circumferential direction of the electrode lead-out hole, and at least a part of the sealing member is arranged between the protruding portion and the first wall along a thickness direction of the first wall.

22. The battery cell of any one of claims 1-21, wherein, The battery monomer further includes an electrode assembly having a tab; The electrode terminal includes a first portion and a second portion connected to each other, the first portion and the second portion are arranged in a stacked manner along a thickness direction of the first wall, the first portion is used to be connected to a busbar member, the second portion is used to be connected to the tab, and a material of the first portion and a material of the second portion are different; The first portion includes a first main body portion and a first protruding portion protruding from a circumferential side of the first main body portion, the first main body portion constitutes a part of the main body portion, the first protruding portion constitutes a part of the protruding portion, and the first limiting portion is arranged in the first main body portion.

23. The battery cell of claim 22, wherein, The second portion includes a second main body portion and a second protruding portion protruding from a circumferential side of the second main body portion, the second main body portion and the first main body portion constitute the main body portion, the second protruding portion and the first protruding portion constitute the protruding portion, and the first protruding portion and the second protruding portion completely overlap along the thickness direction of the first wall.

24. The battery cell of claim 22 or 23, wherein, The material of the first portion is aluminum, and the material of the second portion is copper.

25. The battery cell of any one of claims 1-24, wherein, The shell includes a shell body having an opening and an end cover covering the opening, and the end cover is the first wall.

26. A battery device, characterized by A battery cell as claimed in any one of claims 1-25.

27. An electrical device, comprising: A battery cell as claimed in any one of claims 1-25 or a battery device as claimed in claim 26 for providing electrical energy.

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