Battery cell, battery device and electric device

Abstract

Disclosed in the present application are a battery cell, a battery device, and an electric device. The battery cell comprises a housing, an electrode assembly, and a first electrode terminal and a second electrode terminal having opposite polarities. The housing has a first wall, wherein the first wall is made of steel, and the thickness of the first wall is greater than or equal to 0.2 mm and less than or equal to 1.5 mm. The electrode assembly is disposed inside the housing. In a first direction, the first electrode terminal and the second electrode terminal are spaced apart on the first wall, and the first electrode terminal and the second electrode terminal are electrically connected to the electrode assembly; the first direction is the lengthwise direction of the first wall. In the first direction, the center-to-center distance between the first electrode terminal and the second electrode terminal is a, and the length of the first wall is b, satisfying 40%≤a / b≤90%. The technical solution provided in the present application can effectively improve the reliability of the battery device.

Description

Battery cell, battery device and electric device Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202422181955.3, filed on September 5, 2024, entitled “Battery cell, battery device and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular, to a battery cell, a battery device and an electric device. BACKGROUND

[0003] 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 environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development.

[0004] In the development of battery technology, how to improve the reliability of the battery device is a technical problem that needs to be solved in the battery technology. SUMMARY

[0005] The present application provides a battery cell, a battery device and an electric device. The technical scheme provided by the present application can effectively improve the reliability of the battery device.

[0006] In a first aspect, some embodiments of the present application provide a battery cell. The battery cell includes a housing, an electrode assembly, and a first electrode terminal and a second electrode terminal with opposite polarities. The housing has a first wall, the material of the first wall is steel, the thickness of the first wall is greater than or equal to 0.2 mm and less than or equal to 1.5 mm. The electrode assembly is arranged in the housing. The first electrode terminal and the second electrode terminal are arranged at intervals along a first direction on the first wall, the first electrode terminal and the second electrode terminal are respectively electrically connected to the electrode assembly, and the first direction is the length direction of the first wall. Wherein, along the first direction, the center distance between the first electrode terminal and the second electrode terminal is a, and the length of the first wall is b, and 40%≤a / b≤90% is satisfied.

[0007] In the above scheme, on the one hand, the thickness of the first wall of the shell is set to be greater than or equal to 0.2 mm and less than or equal to 1.5 mm, so that the thickness of the first wall is thin, which can reduce the influence of the thickness of the shell on the volume of the battery monomer, improve the space utilization of the electrode assembly, and thus facilitate the improvement of the volumetric energy density of the battery monomer; on the other hand, by arranging the first electrode terminal and the second electrode terminal with opposite polarities on the same wall part, the electrode terminal single-side tab can effectively improve the space utilization of the electrode assembly compared with the double-side tab scheme, thereby facilitating the improvement of the volumetric energy density of the battery monomer; on the other hand, under the condition of limiting the thickness of the first wall, through multiple tests and comparisons, by limiting the center distance of the first electrode terminal and the second electrode terminal, the ratio between the center distance and the length of the first wall is greater than or equal to 40% and less than or equal to 90%, which can effectively improve the anti-deformation ability under the condition of thin thickness of the first wall, thereby reducing the risk of mutual separation of the electrode terminal and the first wall or the disconnection of the circuit between the electrode terminal and the electrode assembly caused by the impact of the internal expansion force of the battery monomer on the first wall, thereby improving the reliability of the battery monomer, and further improving the reliability of the battery device.

[0008] According to some embodiments of the present application, the length b of the first wall is greater than or equal to 170 mm and less than 210 mm, and the center distance a of the first electrode terminal and the second electrode terminal is greater than or equal to 105 mm and less than or equal to 160 mm along the first direction.

[0009] In some battery monomers in which the length of the first wall is greater than or equal to 170 mm and less than 210 mm, by limiting the value of the center distance of the first electrode terminal and the second electrode terminal, the value is greater than or equal to 105 mm and less than or equal to 160 mm, which can effectively improve the anti-deformation ability under the condition of thin thickness of the first wall and the length of the first wall being greater than or equal to 170 mm and less than 210 mm, thereby reducing the risk of mutual separation of the electrode terminal and the first wall or the disconnection of the circuit between the electrode terminal and the electrode assembly caused by the impact of the internal expansion force of the battery monomer on the first wall, thereby improving the reliability of the battery monomer, and further improving the reliability of the battery device.

[0010] According to some embodiments of the present application, the length b of the first wall is greater than or equal to 170 mm and less than 210 mm, and satisfies 50%≤a / b≤85%.

[0011] In some battery monomers in which the length of the first wall is greater than or equal to 170 mm and less than 210 mm, by limiting the center distance of the first electrode terminal and the second electrode terminal such that the ratio between the center distance and the length of the first wall is greater than or equal to 50% and less than or equal to 85%, the anti-deformation ability under the condition of the thin thickness of the first wall and the length of the first wall being greater than or equal to 170 mm and less than 210 mm can be effectively improved, thereby reducing the risk that the impact of the internal expansion force of the battery monomer on the first wall causes the electrode terminal and the first wall to separate from each other or the circuit between the electrode terminal and the electrode assembly to be disconnected, thereby improving the reliability of the battery monomer, and further improving the reliability of the battery device.

[0012] According to some embodiments of the present application, the length b of the first wall is greater than or equal to 210 mm and less than 240 mm, and the center distance a of the first electrode terminal and the second electrode terminal in the first direction is greater than or equal to 120 mm and less than or equal to 190 mm.

[0013] In some battery monomers in which the length of the first wall is greater than or equal to 210 mm and less than 240 mm, by limiting the value of the center distance of the first electrode terminal and the second electrode terminal such that the value is greater than or equal to 120 mm and less than or equal to 190 mm, the anti-deformation ability under the condition of the thin thickness of the first wall and the length of the first wall being greater than or equal to 210 mm and less than 240 mm can be effectively improved, thereby reducing the risk that the impact of the internal expansion force of the battery monomer on the first wall causes the circuit between the electrode terminal and the electrode assembly to be disconnected, thereby improving the reliability of the battery monomer, and further improving the reliability of the battery device.

[0014] According to some embodiments of the present application, the length b of the first wall 110 is greater than or equal to 210 mm and less than 240 mm, and satisfies 50%≤a / b≤82%.

[0015] In some battery monomers in which the length of the first wall is greater than or equal to 210 mm and less than 240 mm, by limiting the center distance of the first electrode terminal and the second electrode terminal such that the ratio between the center distance and the length of the first wall is greater than or equal to 50% and less than or equal to 82%, the anti-deformation ability under the condition of the thin thickness of the first wall and the length of the first wall being greater than or equal to 210 mm and less than 240 mm can be effectively improved, thereby reducing the risk that the impact of the internal expansion force of the battery monomer on the first wall causes the electrode terminal and the first wall to separate from each other or the circuit between the electrode terminal and the electrode assembly to be disconnected, thereby improving the reliability of the battery monomer, and further improving the reliability of the battery device.

[0016] According to some embodiments of the present application, the length b of the first wall is greater than or equal to 240 mm and less than 270 mm, and the center distance a of the first electrode terminal and the second electrode terminal is greater than or equal to 135 mm and less than or equal to 213 mm along the first direction.

[0017] In some battery monomers in which the length of the first wall is greater than or equal to 240 mm and less than 270 mm, by limiting the value of the center distance of the first electrode terminal and the second electrode terminal to be greater than or equal to 135 mm and less than or equal to 213 mm, the anti-deformation ability under the conditions of the relatively thin thickness of the first wall and the length of the first wall being greater than or equal to 240 mm and less than 270 mm can be effectively improved, thereby reducing the risk of the electrode terminals and the first wall being separated from each other or the circuit between the electrode terminals and the electrode assembly being disconnected due to the impact of the internal expansion force of the battery monomer on the first wall, thereby improving the reliability of the battery monomer, and further improving the reliability of the battery device.

[0018] According to some embodiments of the present application, the length b of the first wall is greater than or equal to 240 mm and less than 270 mm, and satisfies 50%≤a / b≤79%.

[0019] In some battery monomers in which the length of the first wall is greater than or equal to 240 mm and less than 270 mm, by limiting the center distance of the first electrode terminal and the second electrode terminal to be greater than or equal to 135 mm and less than or equal to 213 mm, the anti-deformation ability under the conditions of the relatively thin thickness of the first wall and the length of the first wall being greater than or equal to 240 mm and less than 270 mm can be effectively improved, thereby reducing the risk of the electrode terminals and the first wall being separated from each other or the circuit between the electrode terminals and the electrode assembly being disconnected due to the impact of the internal expansion force of the battery monomer on the first wall, thereby improving the reliability of the battery monomer, and further improving the reliability of the battery device.

[0020] According to some embodiments of the present application, the length b of the first wall is greater than or equal to 270 mm and less than or equal to 320 mm, and the center distance a of the first electrode terminal and the second electrode terminal is greater than or equal to 170 mm and less than or equal to 230 mm along the first direction.

[0021] In some battery monomers in which the length of the first wall is greater than or equal to 270 mm and less than or equal to 320 mm, by limiting the value of the center distance of the first electrode terminal and the second electrode terminal to be greater than or equal to 170 mm and less than or equal to 230 mm, the anti-deformation ability under the conditions of the thin thickness of the first wall and the length of the first wall being greater than or equal to 270 mm and less than or equal to 320 mm can be effectively improved, thereby reducing the risk of the electrode terminals and the first wall being separated from each other or the circuit between the electrode terminals and the electrode assembly being disconnected due to the impact of the internal expansion force of the battery monomer on the first wall, thereby improving the reliability of the battery monomer, and further improving the reliability of the battery device.

[0022] According to some embodiments of the present application, the length b of the first wall is greater than or equal to 270 mm and less than or equal to 320 mm, and satisfies 50%≤a / b≤75%.

[0023] In some battery monomers in which the length of the first wall is greater than or equal to 270 mm and less than or equal to 320 mm, by limiting the center distance of the first electrode terminal and the second electrode terminal, the ratio between the center distance and the length of the first wall is greater than or equal to 55.5% and less than or equal to 71.9%, which can effectively improve the anti-deformation ability under the conditions of the thin thickness of the first wall and the length of the first wall being greater than or equal to 270 mm and less than or equal to 320 mm, thereby reducing the risk of the electrode terminals and the first wall being separated from each other or the circuit between the electrode terminals and the electrode assembly being disconnected due to the impact of the internal expansion force of the battery monomer on the first wall, thereby improving the reliability of the battery monomer, and further improving the reliability of the battery device.

[0024] According to some embodiments of the present application, the material of the first wall is steel, and the thickness of the first wall is greater than or equal to 0.2 mm and less than or equal to 1.5 mm.

[0025] In the above scheme, by setting the material of the first wall to be steel with high structural strength, on the one hand, the anti-expansion ability of the shell can be improved, and on the other hand, the thickness of the first wall can be further thinned to improve the space utilization rate of the battery monomer, thereby increasing the volumetric energy density of the battery monomer, and further increasing the volumetric energy density of the battery device.

[0026] According to some embodiments of the present application, the shell includes a shell body and an end cover, the shell body has a first opening, and the end cover is connected with the shell body and closes the first opening. The first wall is the end cover, and the thickness of the first wall is greater than the thickness of the shell body.

[0027] In the above scheme, by setting the thickness of the first wall to be greater than the thickness of the shell, on the one hand, the structural strength lost due to the opening of the first wall to set the electrode terminal can be compensated for, so that the reliability of the battery monomer is high, on the other hand, the thickness of the shell can be made thinner, the space utilization rate of the electrode assembly can be improved, thereby facilitating the improvement of the volumetric energy density of the battery monomer, and further facilitating the improvement of the volumetric energy density of the battery device.

[0028] According to some embodiments of the present application, the material of the shell is steel, the thickness of the shell is not less than 0.075mm and not more than 0.35mm.

[0029] In the above scheme, by setting the material of the shell to be steel with high structural strength, on the one hand, the expansion resistance of the shell can be improved, on the other hand, the thickness of the shell can be further thinned to improve the space utilization rate of the battery monomer, thereby improving the volumetric energy density of the battery monomer, and further improving the volumetric energy density of the battery device.

[0030] According to some embodiments of the present application, the material of the shell is steel, the thickness of the shell is not less than 0.15mm and not more than 0.25mm.

[0031] According to some embodiments of the present application, the battery monomer further comprises a first connecting piece, the first connecting piece is at least partially disposed on the outer periphery of the first electrode terminal, and the first connecting piece is used to fix the first electrode terminal to the first wall.

[0032] In the above scheme, by setting the first connecting piece on the outer periphery of the first electrode terminal, on the one hand, the first electrode terminal can be effectively fixed to the first wall, reducing the risk of the first electrode terminal separating from the first wall and causing the internal circuit of the battery monomer to be disconnected, so that the reliability of the battery monomer is high; on the other hand, by fixing the first electrode terminal to the first wall through the first connecting piece, the assembly difficulty of the battery monomer can be effectively reduced, and the assembly rhythm of the first electrode terminal can be improved, thereby facilitating the improvement of the manufacturing efficiency of the battery monomer.

[0033] According to some embodiments of the present application, along the thickness direction of the first wall, the first connecting piece is located on the side of the first wall away from the electrode assembly.

[0034] In the above scheme, the first connecting piece is located on the outside of the first wall, on the one hand, facilitating assembly operation, so that the robot or other assembly equipment can efficiently fix the first electrode terminal to the first wall through the first connecting piece; on the other hand, the occupation of the internal space of the battery monomer by the first connecting piece can be reduced, so that the space utilization rate of the electrode assembly is high, thereby facilitating the improvement of the volumetric energy density of the battery monomer and the battery device.

[0035] According to some embodiments of the present application, the first connecting member is connected with the first wall, and a first groove is formed on a side of the first wall away from the electrode assembly in a thickness direction of the first wall, and the first groove is used for accommodating a part of the first connecting member.

[0036] In the above scheme, the first groove is arranged on the outer side of the first wall to accommodate a part of the first connecting member, so that the first connecting member can reasonably utilize the space in the thickness direction of the first wall, thereby reducing the occupation of the external space by the first connecting member, facilitating the control of the overall volume of the battery monomer, thereby facilitating the improvement of the volume energy density of the battery monomer, and further facilitating the improvement of the volume energy density of the battery device.

[0037] According to some embodiments of the present application, the first wall comprises a first through hole, the first electrode terminal comprises a first terminal body and a first flange protruding from an outer circumferential surface of the first terminal body, at least part of the first terminal body is arranged in the first through hole, and at least part of the first flange is located between the first connecting member and the first wall in the thickness direction of the first wall.

[0038] In the above scheme, the first electrode terminal has a simple structure, which is beneficial to manufacturing. The first flange is constrained by the first connecting member and the first wall, so that the displacement of the first electrode terminal in the thickness direction of the first wall is limited, thereby effectively fixing the first electrode terminal to the first wall, reducing the risk of separation of the first wall and the electrode terminal, thereby facilitating the improvement of the reliability of the battery monomer, and further facilitating the improvement of the reliability of the battery device.

[0039] According to some embodiments of the present application, the battery monomer further comprises a first sealing member, at least part of the first sealing member is arranged between the first terminal body and the hole wall of the first through hole.

[0040] In the above scheme, the first sealing member is arranged between the first terminal body and the hole wall of the first wall, which can reduce the risk of leakage of electrolyte between the first terminal body and the hole wall of the first wall, and improve the reliability of the battery monomer. On the other hand, the first sealing member can insulate and isolate the first terminal body from the first wall, thereby reducing the risk of internal short circuit of the battery monomer, and further improving the reliability of the battery monomer.

[0041] According to some embodiments of the present application, the battery monomer further comprises a first insulating member, at least part of the first insulating member is arranged between the first connecting member and the first electrode terminal.

[0042] In the above scheme, the first insulating member is arranged between the first connecting member and the electrode terminal, which can reduce the risk of conduction between the first electrode terminal and the first outer wall through the first connecting member, thereby reducing the risk of internal short circuit of the battery monomer, improving the reliability of the battery monomer, and further improving the reliability of the battery monomer.

[0043] According to some embodiments of the present application, the first wall is integrally formed with the first connecting piece.

[0044] In the above scheme, by integrally forming the first wall with the first connecting piece, on the one hand, the structural strength of the first wall and the first connecting piece is high, which is conducive to improving the stability of the battery monomer structure and making the reliability of the battery monomer high; on the other hand, since the first wall and the first connecting piece are an integral structure, the process of assembling parts is reduced, the manufacturing rhythm of the battery monomer is improved, and the manufacturing efficiency of the battery monomer is improved.

[0045] According to some embodiments of the present application, the first wall has a first through hole, the first electrode terminal includes a first pole and a first conductive piece, and along the thickness direction of the first wall, the first conductive piece is located on the side of the first wall away from the electrode assembly, part of the first pole is located on the side of the first wall facing the electrode assembly, and the other part of the first pole is arranged through the through hole and connected with the first conductive piece.

[0046] In the above scheme, the first electrode terminal includes a first pole and a first conductive piece, and through the mutual connection of the first pole and the first conductive piece, the first electrode terminal can be stably installed on the first wall, the risk of separation of the first wall and the first electrode terminal is reduced, the battery monomer has higher reliability, and the battery device has higher reliability.

[0047] According to some embodiments of the present application, the battery monomer further includes a first sealing piece, at least part of the first sealing piece is arranged between the first pole and the hole wall of the first through hole.

[0048] In the above scheme, by arranging the first sealing piece between the first pole and the hole wall of the first through hole, on the one hand, the risk of leakage of electrolyte between the first pole and the hole wall of the first through hole is reduced, and the reliability of the battery monomer is improved; on the other hand, the first pole and the first wall can be insulated and isolated by the first sealing piece, the risk of internal short circuit of the battery monomer is reduced, and the reliability of the battery monomer is improved.

[0049] According to some embodiments of the present application, the battery monomer further includes a first insulating piece, at least part of the first insulating piece is arranged between the first wall and the first conductive piece.

[0050] In the above scheme, by arranging the first insulating piece between the first wall and the first conductive piece, the risk of conduction between the first electrode terminal and the first wall shell, which leads to internal short circuit of the battery monomer, is reduced, thereby improving the reliability of the battery monomer and improving the reliability of the battery monomer.

[0051] In a second aspect, some embodiments of the present application also provide a battery device including the battery monomer provided in the first aspect.

[0052] In a third aspect, some embodiments of the present application further provide a power utilization device, comprising the battery cell provided in the first aspect and / or the battery device provided in the second aspect, the battery cell being configured to provide electric energy.

[0053] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0054] 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 considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0055] FIG. 1 is a structural schematic diagram of a vehicle in some embodiments of the present application;

[0056] FIG. 2 is a perspective exploded view of a battery device in some embodiments of the present application;

[0057] FIG. 3 is a perspective exploded view of a battery cell in some embodiments of the present application;

[0058] FIG. 4 is a structural schematic diagram of a first wall and an electrode terminal in some embodiments of the present application;

[0059] FIG. 5 is a structural schematic diagram of a first wall, an electrode terminal and a first connecting member in some embodiments of the present application;

[0060] FIG. 6 is a perspective exploded view of a first wall and an electrode terminal in some embodiments of the present application;

[0061] FIG. 7 is a structural schematic diagram of an internal structure of a first wall and a first electrode terminal in some embodiments of the present application;

[0062] FIG. 8 is a perspective exploded view of a first wall and an electrode terminal in some other embodiments of the present application;

[0063] FIG. 9 is a structural schematic diagram of a first wall and an electrode terminal in some other embodiments of the present application;

[0064] FIG. 10 is a perspective exploded view of a first wall and an electrode terminal in some other embodiments of the present application;

[0065] FIG. 11 is a structural schematic diagram of an internal structure of a first wall and a first electrode terminal in some other embodiments of the present application.

[0066] Icon: 1000 - vehicle; 100 - battery device; 200 - controller; 300 - motor; 10 - battery cell; 20 - case; 21 - first case portion; 22 - second case portion; 11 - housing; 110 - first wall; 111 - housing; 1100 - first through-hole; 1101 - second through-hole; 1102 - first groove; 1103 - second groove; 12 - electrode assembly; 120 - first adapter; 121 - second adapter; 13 - electrode terminal; 14 - first electrode terminal; 140 - first terminal body; 141 - first flange; 142 - first pole; 1420 - columnar body; 1421 - plate-like base; 143 - first conductive member; 15 - second electrode terminal; 150 - second pole; 151 - second conductive member; 16 - first connecting member; 160 - first connecting section; 161 - second connecting section; 162 - third connecting section; 17 - second connecting member; 18 - first sealing member; 18a - second sealing member; 19 - first insulating member; z - thickness direction of the first wall; x - first direction. DETAILED DESCRIPTION

[0067] 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 below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0068] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as those commonly understood by one of ordinary skill in the art to which this application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are 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, rather than to describe a particular order or primary and secondary relationship.

[0069] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0070] In the description of the present application, it should be noted that unless specifically stated and limited otherwise, the terms "mounting", "connected", "connection", "attach" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] The term "and / or" in the present application is only to describe the association relationship of the associated objects, which means that there can be three 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 the present application generally represents that the front and rear associated objects have an "or" relationship.

[0072] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0073] "Multiple" appearing in the present application means two or more (including two).

[0074] 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.

[0075] The battery cell can be 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. The embodiments of the present application are not limited thereto.

[0076] 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 inserted 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 allow the active ions to pass through.

[0077] 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.

[0078] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0079] In some embodiments, the electrode assembly further comprises a separator disposed between the positive electrode and the negative electrode.

[0080] In some embodiments, the separator is a separator film. The separator film can be of various types, and any known porous structure separator film with good chemical stability and mechanical stability can be used.

[0081] In some embodiments, the battery cell further comprises an electrolyte, which functions to conduct ions between the positive electrode and the negative electrode. The electrolyte can be in a liquid state, a gel state, or a solid state. Among them, the liquid electrolyte comprises an electrolyte salt and a solvent. In some embodiments, the electrolyte can be an electrolyte solution.

[0082] In some embodiments, the electrode assembly is in a roll structure. The positive electrode sheet and the negative electrode sheet are rolled into the roll structure.

[0083] In some embodiments, the electrode assembly is in a stack structure.

[0084] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0085] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of folded segments which are stacked.

[0086] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments which are stacked.

[0087] As an example, a plurality of separators can be provided, and each of the plurality of separators is disposed between any adjacent positive electrode sheet or negative electrode sheet.

[0088] As an example, the separators can be continuously provided and disposed between any adjacent positive electrode sheet or negative electrode sheet by folding or rolling.

[0089] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prism shape, etc.

[0090] In some embodiments, the electrode assembly is provided with a tab, and the tab can guide current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0091] In some embodiments, the battery cell can comprise a housing. The housing is used to package the electrode assembly and other components such as 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.

[0092] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, the prismatic battery cell including, but not limited to, a square cell, a blade cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc.

[0093] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0094] 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.

[0095] In some embodiments, the battery apparatus can be a battery pack including a box and one or more battery cell assemblies housed in the box.

[0096] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the box by fixing the battery module in the box.

[0097] As an example, the battery cell assembly can also be housed in the box by directly fixing a plurality of battery cells in the box.

[0098] 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. Here, the enclosed means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0099] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame so that an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0100] 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.

[0101] In some embodiments, the battery device can refer to an energy storage device, which includes a box body, at least one side of the box body is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0102] As an example, the battery device includes a beam assembly and a battery monomer assembly, the beam assembly can include a mounting beam and a hanging beam arranged with each other, the mounting beam is used for mounting and fixing the battery monomer assembly, and the hanging beam is used for hanging the battery on the body of the electric device to supply power to the body of the electric device. In some embodiments, the beam assembly can be a part of the structure of the box body.

[0103] The battery device has the advantages of high energy density, small environmental pollution, large power density, long service life, wide adaptation range, small self-discharge coefficient, etc., and is an important part of the development of new energy at present. The development of battery technology needs to consider many design factors, such as cycle life, discharge capacity, charge-discharge rate and other performance parameters, in addition, the energy density and reliability of the battery device also need to be considered.

[0104] In the battery monomer technology, the battery monomer includes a shell, an electrode assembly and an electrode terminal, the electrode terminal is electrically connected with the electrode assembly to realize the input and output of electric energy. The electrode terminal can include first and second electrode terminals with opposite polarities, such as positive and negative electrode terminals. In the related art, the positive and negative electrode terminals can be respectively mounted on a first wall of the shell, and corresponding through holes are usually arranged on the first wall for mounting the positive and negative electrode terminals. In the related art, in order to improve the volume energy density of the battery, the first wall can be made of steel with high structural strength, and the thickness of the first wall can be made thin, for example, the thickness of the first wall is 0.2mm-1.5mm.

[0105] However, under the condition of arranging the through holes on the first wall for mounting the electrode terminals, the thickness of the first wall is set to be thin, which will affect the structural strength of the first wall. With the increase of the number of charge-discharge cycles of the battery, the first wall is deformed by the internal expansion force of the battery monomer, and the separation between the electrode terminal and the first wall or the disconnection of the circuit between the electrode terminal and the electrode assembly is caused due to the low structural strength of the first wall, which increases the risk of the battery monomer and the battery device.

[0106] In view of this, in order to improve the problem of low battery cell reliability caused by low first wall structure strength, some embodiments of the present application provide a battery cell, which comprises a shell, an electrode assembly, and first and second electrode terminals with opposite polarities. The shell has a first wall with a thickness greater than or equal to 0.2 mm and less than or equal to 1.5 mm. The electrode assembly is arranged in the shell. The first and second electrode terminals are arranged at the first wall in a first direction, and the first and second electrode terminals are electrically connected to the electrode assembly, respectively. The first direction is the length direction of the first wall. Wherein, along the first direction, the center distance of the first and second electrode terminals is a, and the length of the first wall is b, and 40%≤a / b≤90% is satisfied.

[0107] In the above scheme, on the one hand, the thickness of the first wall of the shell is set to be greater than or equal to 0.2 mm and less than or equal to 1.5 mm, so that the thickness of the first wall is thin, which can reduce the influence of the thickness of the shell on the volume of the battery cell, and can improve the space utilization of the electrode assembly, thereby facilitating the improvement of the volumetric energy density of the battery cell; on the other hand, by arranging the first and second electrode terminals with opposite polarities on the same wall, the electrode terminals can be arranged on one side of the wall, which can effectively improve the space utilization of the electrode assembly compared with the scheme of arranging the electrode terminals on both sides, thereby facilitating the improvement of the volumetric energy density of the battery cell; on the other hand, under the condition of limiting the thickness of the first wall, through multiple tests and comparisons, by limiting the center distance of the first and second electrode terminals, the center distance and the length of the first wall are greater than or equal to 50% and less than or equal to 90%, which can effectively improve the anti-deformation ability under the condition of thin thickness of the first wall, thereby reducing the risk of circuit disconnection between the electrode terminals and the electrode assembly caused by the impact of the internal expansion force of the battery cell on the first wall, thereby improving the reliability of the battery cell, and further improving the reliability of the battery device.

[0108] The battery device disclosed in the embodiments of the present application can be used in an electric device such as a vehicle, a ship or an aircraft, etc. A power supply system comprising the battery device disclosed in the present application can be used to constitute the electric device, which is advantageous to alleviate the problem of short circuit of the battery device in use, to improve the use reliability of the battery device, and to improve the volumetric energy density of the battery device and the working time of the electric device.

[0109] The embodiments of the present application provide a power consumption device using a battery device as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric plane toy, and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft.

[0110] The following embodiments are described by taking a power consumption device as a vehicle in an embodiment of the present application as an example for convenience of description.

[0111] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle in 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 automobile, a hybrid electric automobile or a range extended automobile. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery device 100 can be used to supply power for the vehicle 1000, for example, the battery device 100 can be used as an operating power supply or a use power supply of the vehicle 1000. 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 for the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0112] In some embodiments of the present application, the battery device 100 can not only be used as an operating power supply or a use power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0113] Referring to FIG. 2, FIG. 2 is a perspective exploded view of the battery device 100 in some embodiments of the present application.

[0114] The battery device 100 includes a battery cell 10 and a case 20, wherein the battery cell 10 is accommodated in the case 20. The case 20 is configured to provide an accommodation space for the battery cell 10, and the case 20 can have various structures. In some embodiments, the case 20 can include a first case portion 21 and a second case portion 22, wherein the first case portion 21 and the second case portion 22 are coupled to each other to define an accommodation space for the battery cell 10. The second case portion 22 can be a hollow structure with one open end, and the first case portion 21 can be a plate structure. The first case portion 21 is coupled to the open end of the second case portion 22 to define the accommodation space together with the second case portion 22. Alternatively, the first case portion 21 and the second case portion 22 can both be hollow structures with one open end, and the open end of the first case portion 21 is coupled to the open end of the second case portion 22. Of course, the case 20 formed by the first case portion 21 and the second case portion 22 can have various shapes, such as a cylindrical shape or a cuboid shape.

[0115] In the battery, the battery cell 10 can be one or multiple, and each battery cell 10 can be fixed to the case 20 by a connecting member (e.g., a bolt) or by adhesion.

[0116] In some embodiments, the battery cells 10 in the case 20 can be electrically connected by a busbar component, so that the battery cells 10 in the case 20 are connected in series, in parallel, or in a mixed connection. For example, the case 20 can include multiple battery cell assemblies, each of which includes multiple battery cells 10 stacked together and connected in series by a busbar component. In some embodiments, the multiple battery cell assemblies can be connected in series by a busbar component.

[0117] According to some embodiments of the present application, a battery cell 10 is provided, as shown in FIG. 3 and FIG. 4. FIG. 3 is a perspective exploded view of the battery cell 10 according to some embodiments of the present application, and FIG. 4 is a structural schematic view of a first wall 110 and an electrode terminal 13 according to some embodiments of the present application.

[0118] The battery cell 10 includes a housing 11, an electrode assembly 12, and first and second electrode terminals 14 and 15 of opposite polarity. The housing 11 has a first wall 110 with a thickness greater than or equal to 0.2 mm and less than or equal to 1.5 mm. The electrode assembly 12 is disposed in the housing 11. The first and second electrode terminals 14 and 15 are spaced apart from each other along a first direction x, which is the length direction of the first wall 110, and are electrically connected to the electrode assembly 12. The center-to-center distance between the first and second electrode terminals 14 and 15 along the first direction x is a, and the length of the first wall 110 is b, and 40%≤a / b≤94.4% is satisfied.

[0119] In some embodiments, the battery cell 10 includes the housing 11 and the electrode assembly 12, and the electrode assembly 12 and an electrolyte can be encapsulated in a closed space of the housing 11. In some embodiments, the number of the electrode assembly 12 can be one or more. Optionally, referring to FIG. 3, the battery cell 10 includes two electrode assemblies 12 stacked in the housing 111.

[0120] In some embodiments, the housing 11 can be made of a metal material, such as aluminum, steel, or a composite metal. In some embodiments, the materials of different wall portions of the housing 11 can be the same or different. For example, the housing 11 can include a housing 111 having a first opening through which the electrode assembly 12 can be inserted into the housing 111, and an end cap that covers the first opening of the housing 111 so that the electrode assembly 12 is located in a closed space. The end cap can be made of a metal material, the housing 111 can be made of another metal material, and the end cap and the housing 111 can be made of the same metal material.

[0121] In some embodiments, the housing 11 can be a square housing, a cylindrical housing, or a polygonal prism-shaped housing. Some embodiments of the present application are exemplified by taking the housing 11 as a square housing.

[0122] The housing 11 has a first wall 110, which is one of different wall portions of the housing 11. Optionally, the first wall 110 can be an end cap of the housing 11. Alternatively, the first wall 110 can be a wall portion of another part of the housing 11, such as a bottom wall or a side wall of the housing 11.

[0123] The first wall 110 can be provided with an electrode terminal 13 for electrically connecting to the electrode assembly 12 to achieve input or output of electric energy. For example, one end of the electrode terminal 13 is electrically connected to the electrode assembly 12, and the other end is electrically connected to an external bus member.

[0124] The electrode terminal 13 includes a first electrode terminal 14 and a second electrode terminal 15, which are opposite in polarity, one being a positive electrode terminal 13 and the other being a negative electrode terminal 13. Taking the example of the first electrode terminal 14 corresponding to the positive electrode and the second electrode terminal 15 corresponding to the negative electrode, the first electrode terminal 14 is electrically connected to the positive electrode tab of the electrode assembly 12 at one end inside the case 11, and the two can be directly or indirectly connected, for example, the first electrode terminal 14 is connected to the positive electrode tab through a first adapter 120, and the first electrode terminal 14 is connected to the external bus member at the other end outside the case 11. The second electrode terminal 15 is electrically connected to the negative electrode tab of the electrode assembly 12 at one end inside the case 11, and the two can be directly or indirectly connected, for example, the second electrode terminal 15 is connected to the negative electrode tab through a second adapter 121, and the second electrode terminal 15 is connected to the external bus member at the other end outside the case 11.

[0125] In some embodiments, the electrode terminal 13 is made of a metal material, for example, made of aluminum, copper, iron, steel, alloy or composite metal.

[0126] In some embodiments, the first wall 110 is provided with a first through hole 1100 and a second through hole 1101, which correspond to the first electrode terminal 14 and the second electrode terminal 15 respectively, and the first through hole 1100 and the second through hole 1101 penetrate the first wall 110 along the thickness direction z of the first wall. Illustratively, the first electrode terminal 14 passes through the first through hole 1100, so that a part inside the first wall 110 can be electrically connected to the electrode assembly 12, and a part outside the first wall 110 can be electrically connected to the external bus member.

[0127] In some embodiments, the first wall 110 and the electrode terminal 13 can be connected directly or indirectly, and the connection forms include but are not limited to riveting, welding, bonding or threaded connection. For example, the connection between the first electrode terminal 14 and the first wall 110 is described as an example, the first electrode terminal 14 includes a first conductive part 143 and a first pole 142, a part of the first pole 142 is located on the inner side of the first wall 110 to be electrically connected with the electrode assembly 12, another part of the first pole 142 passes through the first through hole 1100 to be riveted with the first conductive part 143 by riveting, and the first conductive part 143 is located on the outer side of the first wall 110 and can be used to be electrically connected with the external bus component. Alternatively, the first electrode terminal 14 passes through the first through hole 1100 and is fixed to the first wall 110 by the first connecting part 16, for example, the first connecting part 16 includes a welding ring, the welding ring is arranged along the circumference of the first electrode terminal 14, the welding ring presses the first electrode terminal 14 on the first wall 110, and the welding ring is welded with the first wall 110, and an insulating structure can be arranged between the welding ring and the first electrode terminal 14 to insulate and separate the first electrode terminal 14 and the welding ring.

[0128] Optionally, the first wall 110 can be an integral structure with other wall parts of the shell 11, for example, the first wall 110 is integrally formed with other wall parts of the shell 11.

[0129] Optionally, the first wall 110 and other wall parts of the shell 11 are separate structures, for example, the first wall 110 is an end cover, and the first wall 110 is connected with the shell body 111 and seals the first opening of the shell body 111. For example, the first wall 110 is an end cover, the electrode terminal 13 is mounted on the first wall 110, and the first wall 110 can be directly or indirectly connected with the shell body 111 to seal the first opening of the shell body 111. The connection between the first wall 110 and the shell body 111 can be in various forms, for example, the connection between the first wall 110 and the shell body 111 includes but is not limited to welding, bonding, riveting or threaded connection.

[0130] In some embodiments provided in the present application, the first wall 110 is made of steel, and the thickness of the first wall 110 can be greater than or equal to 0.2 mm and less than or equal to 1.5 mm, for example, the thickness of the first wall 110 can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm or any value between adjacent two values.

[0131] In some embodiments, the greater the volume of the battery cell 10, the greater the thickness of the first wall 110 can be, and the smaller the volume of the battery cell 10, the smaller the thickness of the first wall 110 can be.

[0132] In some embodiments, the first direction x can be the length direction of the first wall 110, which can be understood as that the outer contour shape of the first wall 110 can be a rectangle, and the length direction can be the direction with the largest dimension of the first wall 110.

[0133] The "first electrode terminal 14 and the second electrode terminal 15 are spaced apart from each other along the first direction x on the first wall 110" can be understood as that the first electrode terminal 14 and the second electrode terminal 15 are spaced apart from each other along the first direction x, and have a spacing therebetween to reduce the risk of positive and negative short circuits.

[0134] The "center distance between the first electrode terminal 14 and the second electrode terminal 15 along the first direction x" can be understood as the distance between the center axis of the first electrode terminal 14 and the center axis of the second electrode terminal 15 along the first direction x. The center axis of the first electrode terminal 14 and the center axis of the second electrode terminal 15 can be parallel to the thickness direction z of the first wall, respectively.

[0135] In some embodiments, a / b can be understood as the ratio of the center distance a between the first electrode terminal 14 and the second electrode terminal 15 along the first direction x to the length b of the first wall 110. The value of a / b can be greater than or equal to 40% and less than or equal to 90%. For example, the value of a / b can be 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%,..., 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, or any value between any two adjacent values.

[0136] Alternatively, the value of a / b can be greater than or equal to 50% or less than or equal to 90%, that is, the value of a / b can be 50%, 90%, or any value between the two values.

[0137] Alternatively, the value of a / b can be greater than or equal to 50% or less than or equal to 85%, that is, the value of a / b can be 50%, 85%, or any value between the two values.

[0138] Alternatively, the value of a / b can be greater than or equal to 50% or less than or equal to 82%, that is, the value of a / b can be 50%, 82%, or any value between the two values.

[0139] Optionally, the value of a / b can be greater than or equal to 50% or less than or equal to 79%, that is, the value of a / b can be 50%, 79%, or any value between the two values.

[0140] Optionally, the value of a / b can be greater than or equal to 50% or less than or equal to 75%, that is, the value of a / b can be 50%, 75%, or any value between the two values.

[0141] In some embodiments, the length of the first wall 110 can be measured by a laser ranging method, a direct method, or a projection ranging method.

[0142] In some embodiments, the center distance of the first electrode terminal 14 and the second electrode terminal 15 along the first direction x can be measured by a laser ranging method, a direct method, or a projection ranging method.

[0143] In the above scheme, on the one hand, the thickness of the first wall 110 of the shell 11 is greater than or equal to 0.2 mm and less than or equal to 1.5 mm, so that the thickness of the first wall 110 is thin, which can reduce the influence of the thickness of the shell 11 on the volume of the battery monomer 10, and can improve the space utilization of the electrode assembly 12, thereby facilitating the improvement of the volumetric energy density of the battery monomer 10; on the other hand, by arranging the first electrode terminal 14 and the second electrode terminal 15 with opposite polarities on the same wall, the electrode terminal 13 can be single-sidedly provided with a tab, which can effectively improve the space utilization of the electrode assembly 12 compared with the double-sided tab scheme, thereby facilitating the improvement of the volumetric energy density of the battery monomer 10; on the other hand, under the condition of limiting the thickness of the first wall 110, through multiple tests and comparisons, by limiting the center distance of the first electrode terminal 14 and the second electrode terminal 15, the center distance and the length of the first wall 110 are greater than or equal to 40% and less than or equal to 90%, which can effectively improve the anti-deformation ability under the condition of the thin thickness of the first wall 110, thereby reducing the risk of the circuit between the electrode terminal 13 and the electrode assembly 12 being disconnected due to the impact of the internal expansion force of the battery monomer 10 on the first wall 110, thereby improving the reliability of the battery monomer 10, and further improving the reliability of the battery device 100.

[0144] According to some embodiments of the present application, the length b of the first wall 110 is greater than or equal to 170 mm and less than 210 mm, and the center distance a of the first electrode terminal 14 and the second electrode terminal 15 along the first direction x is greater than or equal to 105 mm and less than or equal to 160 mm.

[0145] In some embodiments, the length of the first wall 110 of some battery monomers 10 of some specifications is greater than or equal to 170 mm and less than 210 mm, for example, the length b of the first wall 110 is 170 mm, 171 mm, 172 mm, 173 mm, 174 mm, 175 mm, 176 mm, 177 mm, 178 mm, 179 mm, 180 mm…208 mm, 209 mm, or a value less than 210 mm, or any value between adjacent two values. In some battery monomers 10 of some specifications, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 in the first direction x can be greater than or equal to 105 mm and less than or equal to 160 mm, for example, a can be 105 mm, 106 mm, 107 mm, 108 mm, 109 mm, 110 mm…156 mm, 157 mm, 158 mm, 159 mm, 160 mm or any value between adjacent two values.

[0146] Exemplarily, in some battery monomers 10 of some specifications with a first wall 110 of 188 mm in length, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 in the first direction x can be 155 mm.

[0147] In the above scheme, in some battery monomers 10 with a first wall 110 of greater than or equal to 170 mm and less than 210 mm in length, by limiting the value of the center distance a between the first electrode terminal 14 and the second electrode terminal 15, so that the value is greater than or equal to 105 mm and less than or equal to 160 mm, the anti-deformation ability under the conditions of the thin thickness of the first wall 110 and the length of the first wall 110 greater than or equal to 170 mm and less than 210 mm can be effectively improved, thereby reducing the risk of the circuit between the electrode terminal 13 and the electrode assembly 12 being disconnected due to the impact of the internal expansion force of the battery monomer 10 on the first wall 110, thereby improving the reliability of the battery monomer 10, and further improving the reliability of the battery device 100.

[0148] According to some embodiments of the present application, the length b of the first wall is greater than or equal to 170 mm and less than 210 mm, and satisfies 50%≤a / b≤85%.

[0149] In some embodiments, the length of the first wall 110 of some battery monomers 10 is greater than or equal to 170mm and less than 210mm, for example, the length b of the first wall 110 is 170mm, 171mm, 172mm, 173mm, 174mm, 175mm, 176mm, 177mm, 178mm, 179mm, 180mm…208mm, 209mm, or a value less than 210mm, or any value between adjacent two values. In some battery monomers 10, the ratio a / b between the center distance a of the first electrode terminal 14 and the second electrode terminal 15 and the length b of the first wall 110 along the first direction x can be 50%, 51%, 52%, 53%, 54%…81%, 82%, 83%, 84%, 85% or any value between adjacent two values.

[0150] Exemplarily, in some battery monomers 10 of the length b of the first wall 110 is 177mm, the center distance a of the first electrode terminal 14 and the second electrode terminal 15 can be 135mm.

[0151] Exemplarily, in some battery monomers 10 of the length b of the first wall 110 is 170mm, the center distance a of the first electrode terminal 14 and the second electrode terminal 15 can be 120mm.

[0152] In the above scheme, in some battery monomers of the length of the first wall 110 greater than or equal to 177mm and less than 210mm, by limiting the center distance of the first electrode terminal 14 and the second electrode terminal 15, so that the ratio between the center distance and the length of the first wall 110 is greater than or equal to 50.4% and less than or equal to 76.2%, the anti-deformation ability under the condition of the thin thickness of the first wall and the length of the first wall greater than or equal to 177mm and less than 210mm can be effectively improved, thereby reducing the risk of the circuit between the electrode terminal and the electrode assembly being disconnected caused by the impact of the internal expansion force of the battery monomer on the first wall, thereby improving the reliability of the battery monomer, and further improving the reliability of the battery device.

[0153] According to some embodiments of the present application, the length b of the first wall 110 is greater than or equal to 210mm and less than 240mm, and along the first direction x, the center distance a of the first electrode terminal 14 and the second electrode terminal 15 is greater than or equal to 120mm and less than or equal to 190mm.

[0154] In some embodiments, the length of the first wall 110 of some battery monomers 10 of some specifications is greater than or equal to 210 mm and less than 240 mm, for example, the length b of the first wall 110 is 210 mm, 211 mm, 212 mm, 213 mm, 238 mm, 239 mm, or a value less than 240 mm, or any value between adjacent two values. In the some battery monomers 10 of some specifications, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 in the first direction x can be greater than or equal to 120 mm and less than or equal to 190 mm, for example, a can be 120 mm, 121 mm, 122 mm, 123 mm, 124 mm, 125 mm, 126 mm, 127 mm, 128 mm, 129 mm, 190 mm, or any value between adjacent two values.

[0155] Exemplarily, in some battery monomers 10 of some specifications with a first wall 110 of 220 mm in length, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 in the first direction x can be 188 mm.

[0156] Exemplarily, in some battery monomers 10 of some specifications with a first wall 110 of 210 mm in length, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 in the first direction x can be 150 mm.

[0157] In the above scheme, in some battery monomers 10 with a first wall 110 of greater than or equal to 210 mm and less than 240 mm in length, by limiting the value of the center distance between the first electrode terminal 14 and the second electrode terminal 15, the value is greater than or equal to 120 mm and less than or equal to 190 mm, the anti-deformation ability under the condition of the thin thickness of the first wall 110 and the length of the first wall 110 greater than or equal to 210 mm and less than 240 mm can be effectively improved, thereby reducing the risk of the circuit between the electrode terminal 13 and the electrode assembly 12 being disconnected due to the impact of the internal expansion force of the battery monomer 10 on the first wall 110, thereby improving the reliability of the battery monomer 10, and further improving the reliability of the battery device 100.

[0158] According to some embodiments of the present application, the length b of the first wall 110 is greater than or equal to 210 mm and less than 240 mm, and satisfies 56.2%≤a / b≤80.9%.

[0159] In some embodiments, the length of the first wall 110 of some specifications of the battery cell 10 is greater than or equal to 210 mm and less than 240 mm, for example, the length b of the first wall 110 is 210 mm, 211 mm, 212 mm, 213 mm, …, 238 mm, 239 mm, or a value less than 240 mm, or any value between adjacent two values. In the battery cell 10 of some specifications, the ratio a / b between the center distance a of the first electrode terminal 14 and the second electrode terminal 15 and the length b of the first wall 110 along the first direction x can be 50%, 51%, 52%, 53%, 54%, …, 81%, 82%, or any value between adjacent two values.

[0160] In the above scheme, in some battery cells in which the length of the first wall 110 is greater than or equal to 210 mm and less than 240 mm, by limiting the center distance of the first electrode terminal 14 and the second electrode terminal 15, the ratio between the center distance and the length of the first wall 110 is greater than or equal to 50% and less than or equal to 82%, which can effectively improve the anti-deformation ability under the condition of the thin thickness of the first wall and the condition that the length of the first wall is greater than or equal to 210 mm and less than 240 mm, thereby reducing the risk of the circuit between the electrode terminals and the electrode assembly being disconnected due to the impact of the internal expansion force of the battery cell on the first wall, thereby improving the reliability of the battery cell, and further improving the reliability of the battery device.

[0161] According to some embodiments of the present application, the length b of the first wall 110 is greater than or equal to 240 mm and less than 270 mm, and along the first direction x, the center distance a of the first electrode terminal 14 and the second electrode terminal 15 is greater than or equal to 135 mm and less than or equal to 213 mm.

[0162] In some embodiments, the length of the first wall 110 of some specifications of the battery cell 10 is greater than or equal to 240 mm and less than 270 mm, for example, the length b of the first wall 110 is 240 mm, 241 mm, 242 mm, 243 mm, …, 268 mm, 269 mm, or a value less than 270 mm, or any value between adjacent two values. In the battery cell 10 of some specifications, the value of the center distance a of the first electrode terminal 14 and the second electrode terminal 15 along the first direction x can be greater than or equal to 135 mm and less than or equal to 213 mm, for example, the value of a can be 135 mm, 136 mm, 137 mm, 138 mm, 139 mm, …, 209 mm, 210 mm, 211 mm, 212 mm, 213 mm, or any value between adjacent two values.

[0163] Exemplarily, in some battery monomer 10 of which the length of the first wall 110 is 240mm, the center distance a of the first electrode terminal 14 and the second electrode terminal 15 along the first direction x can be 190mm.

[0164] In the above scheme, in some battery monomer 10 of which the length of the first wall 110 is greater than or equal to 240mm and less than 270mm, by limiting the value of the center distance of the first electrode terminal 14 and the second electrode terminal 15 to be greater than or equal to 135mm and less than or equal to 213mm, the anti-deformation ability under the condition of the thin thickness of the first wall 110 and the length of the first wall 110 being greater than or equal to 240mm and less than 270mm can be effectively improved, thereby reducing the risk of the circuit between the electrode terminal 13 and the electrode assembly 12 being disconnected due to the impact of the internal expansion force of the battery monomer 10 on the first wall 110, thereby improving the reliability of the battery monomer 10, and further improving the reliability of the battery device 100.

[0165] According to some embodiments of the present application, the length b of the first wall 110 is greater than or equal to 240mm and less than 270mm, and satisfies 50%≤a / b≤79%.

[0166] In some embodiments, the length of the first wall 110 of some specifications of battery monomer 10 is greater than or equal to 240mm and less than 270mm, for example, the length b of the first wall 110 is 240mm, 241mm, 242mm, 243mm…268mm, 269mm, or a value less than 270mm, or any value between adjacent two values. In some specifications of battery monomer 10, the ratio a / b between the center distance a of the first electrode terminal 14 and the second electrode terminal 15 along the first direction x and the length b of the first wall 110 can be 50%, 51%, 52%, 53%, 54%…77%, 78%, 79% or any value between adjacent two values.

[0167] Exemplarily, in some battery monomer 10 of which the length of the first wall 110 is 240mm, the center distance a of the first electrode terminal 14 and the second electrode terminal 15 along the first direction x can be 190mm.

[0168] In some battery monomers of the above scheme, the length of the first wall 110 is greater than or equal to 240 mm and less than 270 mm, and by limiting the center distance of the first electrode terminal 14 and the second electrode terminal 15, the ratio between the center distance and the length of the first wall 110 is greater than or equal to 50% and less than or equal to 79%, which can effectively improve the anti-deformation ability under the condition of the thin thickness of the first wall and the length of the first wall being greater than or equal to 240 mm and less than 270 mm, thereby reducing the risk of the circuit between the electrode terminal and the electrode assembly being disconnected due to the impact of the internal expansion force of the battery monomer on the first wall, thereby improving the reliability of the battery monomer, and further improving the reliability of the battery device.

[0169] According to some embodiments of the present application, the length b of the first wall 110 is greater than or equal to 270 mm and less than or equal to 320 mm, and along the first direction x, the center distance a of the first electrode terminal 14 and the second electrode terminal 15 is greater than or equal to 170 mm and less than or equal to 230 mm.

[0170] In some embodiments, the length of the first wall 110 of some specifications of the battery monomer 10 is greater than or equal to 270 mm and less than or equal to 320 mm, for example, the length b of the first wall 110 is 270 mm, 271 mm, 272 mm, 273 mm…318 mm, 319 mm, 320 mm or any value between adjacent two values. In some specifications of the battery monomer 10, along the first direction x, the center distance a of the first electrode terminal 14 and the second electrode terminal 15 can be greater than or equal to 170 mm and less than or equal to 230 mm, for example, the value of a can be 170 mm, 171 mm, 172 mm, 173 mm, 174 mm…209 mm, 227 mm, 228 mm, 229 mm, 230 mm or any value between adjacent two values.

[0171] Exemplarily, in some battery monomers 10 of the specification with the length of the first wall 110 being 280 mm, along the first direction x, the center distance a of the first electrode terminal 14 and the second electrode terminal 15 can be 210 mm.

[0172] In some battery monomers 10 in which the length of the first wall 110 is greater than or equal to 270 mm and less than or equal to 320 mm, in the above scheme, by limiting the value of the center distance of the first electrode terminal 14 and the second electrode terminal 15, so that the value is greater than or equal to 170 mm and less than or equal to 230 mm, the anti-deformation ability under the condition of the thin thickness of the first wall 110 and the length of the first wall 110 greater than or equal to 270 mm and less than or equal to 320 mm can be effectively improved, thereby reducing the risk of the impact of the internal expansion force of the battery monomer on the first wall 110 causing the circuit between the electrode terminal 13 and the electrode assembly 12 to be disconnected, thereby improving the reliability of the battery monomer 10, thereby improving the reliability of the battery device 100.

[0173] According to some embodiments of the present application, the length b of the first wall 110 is greater than or equal to 270 mm and less than or equal to 320 mm, and satisfies 50%≤a / b≤75%.

[0174] In some embodiments, the length of the first wall 110 of some specifications of battery monomers 10 is greater than or equal to 270 mm and less than or equal to 320 mm, for example, the length b of the first wall 110 is 270 mm, 271 mm, 272 mm, 273 mm…318 mm, 319 mm, 320 mm or any value between any two adjacent values. In some specifications of battery monomers 10, the ratio a / b between the center distance a of the first electrode terminal 14 and the second electrode terminal 15 and the length b of the first wall 110 along the first direction x can be 50%, 51%, 52%, 53%, 54%…71%, 72%, 73%, 74%, 75% or any value between any two adjacent values.

[0175] For example, in some battery monomers 10 of the specification in which the length of the first wall 110 is 270 mm, the center distance a of the first electrode terminal 14 and the second electrode terminal 15 along the first direction x can be 190 mm.

[0176] In some battery monomers in which the length of the first wall 110 is greater than or equal to 270 mm and less than or equal to 320 mm, in the above scheme, by limiting the center distance of the first electrode terminal 14 and the second electrode terminal 15, so that the ratio between the center distance and the length of the first wall 110 is greater than or equal to 50% and less than or equal to 75%, the anti-deformation ability under the condition of the thin thickness of the first wall and the length of the first wall greater than or equal to 270 mm and less than or equal to 320 mm can be effectively improved, thereby reducing the risk of the impact of the internal expansion force of the battery monomer on the first wall causing the circuit between the electrode terminal and the electrode assembly to be disconnected, thereby improving the reliability of the battery monomer, thereby improving the reliability of the battery device.

[0177] According to some embodiments of the present application, the thickness of the first wall 110 is greater than or equal to 0.5 mm and less than or equal to 1.3 mm.

[0178] In some embodiments, the material of the first wall 110 is steel, and the thickness of the first wall 110 can be greater than or equal to 0.5 mm and less than or equal to 1.3 mm. For example, the thickness of the first wall 110 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, or any value between any two adjacent values.

[0179] In the above scheme, by setting the material of the first wall 110 to be steel with high structural strength, on the one hand, the anti-expansion capability of the shell 11 can be improved, and on the other hand, the thickness of the first wall 110 can be further reduced, so that the space utilization of the battery monomer 10 is improved, thereby the volume energy density of the battery monomer 10 is high, and further the volume energy density of the battery device 100 is high.

[0180] According to some embodiments of the present application, referring to FIG. 3, the shell 11 includes a housing 111 and an end cover. The housing 111 has a first opening, and the end cover is connected with the housing 111 and closes the first opening. The first wall 110 is the end cover, and the thickness of the first wall 110 is greater than the thickness of the housing 111.

[0181] In some embodiments, the shell 11 includes a housing 111 and an end cover in a split structure. The housing 111 has a first opening, and the electrode assembly 12 can be placed into the housing 111 through the first opening. The end cover is connected with the housing 111 and closes the first opening. The end cover can be the first wall 110, and the first wall 110 can be connected with the housing 111 by welding or other connection relationship.

[0182] In some embodiments, the first wall 110 and the housing 111 are made of the same material, for example, the first wall 110 and the housing 111 are made of steel, and the thickness of the first wall 110 can be greater than the thickness of the housing 111.

[0183] In some embodiments, the first wall 110 and the housing 111 can be made of different materials, for example, the material of the first wall 110 is aluminum, and the material of the housing 111 is steel, and the thickness of the first wall 110 can be greater than the thickness of the housing 111.

[0184] In the above scheme, by setting the thickness of the first wall 110 to be greater than the thickness of the shell 111, on the one hand, the structural strength lost due to the opening of the first wall 110 to arrange the electrode terminal 13 can be compensated, so that the reliability of the battery monomer 10 is high, on the other hand, the thickness of the shell 111 can be thin, the space utilization rate of the electrode assembly 12 can be improved, thereby facilitating the improvement of the volume energy density of the battery monomer 10, and further facilitating the improvement of the volume energy density of the battery device 100.

[0185] According to some embodiments of the present application, the material of the shell 111 is steel, and the thickness of the shell 111 is not less than 0.075 mm and not greater than 0.35 mm.

[0186] In some embodiments, the shell 111 is made of steel, and the thickness of the shell 111 can be 0.075 mm, 0.080 mm, 0.085 mm, 0.090 mm, 0.095 mm, 0.1 mm, …, 0.340 mm, 0.345 mm, 0.35 mm, or any value between any two adjacent values.

[0187] In the above scheme, by setting the material of the shell 111 to be steel with high structural strength, on the one hand, the expansion resistance of the outer shell 11 can be improved, and on the other hand, the thickness of the shell 111 can be further thinned, so that the space utilization rate of the battery monomer 10 is improved, thereby the volume energy density of the battery monomer 10 is high, and further the volume energy density of the battery device 100 is high.

[0188] According to some embodiments of the present application, the thickness of the shell 111 is not less than 0.15 mm and not greater than 0.25 mm.

[0189] In some embodiments, the shell 111 is made of steel, and the thickness of the shell 111 can be not less than 0.15 mm and not greater than 0.25 mm, for example, the thickness of the shell 111 can be 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, or any value between any two adjacent values.

[0190] In the above scheme, by setting the material of the shell 111 to be steel with high structural strength, on the one hand, the expansion resistance of the outer shell 11 can be improved, and on the other hand, the thickness of the shell 111 can be further thinned, so that the space utilization rate of the battery monomer 10 is improved, thereby the volume energy density of the battery monomer 10 is high, and further the volume energy density of the battery device 100 is high.

[0191] According to some embodiments of the present application, referring to FIG. 5-7, FIG. 5 is a schematic diagram of the structure of the first wall 110, the electrode terminal 13 and the first connecting member 16 according to some embodiments of the present application, FIG. 6 is a perspective exploded view of the first wall 110, the electrode terminal 13 and the first connecting member 16 according to some embodiments of the present application, and FIG. 7 is a schematic diagram of the internal structure of the first wall 110, the first connecting member 16 and the first electrode terminal 14 according to some embodiments of the present application.

[0192] The battery cell 10 further comprises a first connecting member 16, which is arranged at least partially around the first electrode terminal 14, and is used to fix the first electrode terminal 14 to the first wall 110.

[0193] In some embodiments, the first electrode terminal 14 is fixed by the first connecting member 16, which can be connected to the first wall 110 to limit the position of the first electrode terminal 14 on the first wall 110. For example, the first wall 110 is formed with a first through hole 1100, and the first electrode terminal 14 passes through the first through hole 1100. The first connecting member 16 is connected to the first wall 110, and the first connecting member 16 abuts against the first electrode terminal 14 on the first wall 110 to limit the position of the first electrode terminal 14 in the thickness direction z of the first wall.

[0194] The "first connecting member 16 is arranged at least partially around the first electrode terminal 14" can be understood as that the first connecting member 16 is arranged along the circumferential direction of the first electrode terminal 14 to fix the first electrode terminal 14 to the first wall 110 in the circumferential direction of the first electrode terminal 14. Optionally, the first connecting member 16 can be annular, and the inner periphery of the first connecting member 16 can act on the first electrode terminal 14, and the outer periphery can be connected to the first wall 110.

[0195] In some embodiments, the first connecting member 16 can be arranged on the outer side or the inner side of the first wall 110 in the thickness direction z of the first wall. Optionally, referring to FIG. 7, the first connecting member 16 comprises a first connecting segment 160, a second connecting segment 161 and a third connecting segment 162. The first connecting segment 160 is connected to the outer side of the first wall 110, and the third connecting segment 162 is connected to the first connecting segment 160 through the second connecting segment 161. The third connecting segment 162 is bent compared to the first connecting segment 160 to jointly hold the part of the first electrode terminal 14 with the first wall 110, so as to limit the first electrode terminal 14 from being pulled out of the first through hole 1100.

[0196] In some embodiments, the first connecting member 16 can be made of metal, for example, aluminum, steel or composite metal. In other embodiments, the first connecting member 16 can be made of non-metal material, for example, plastic or the like.

[0197] In some embodiments, the first connecting piece 16 and the first wall 110 can be in a split structure, and the two are connected by welding, bonding, riveting or threaded connection. In other embodiments, the first connecting piece 16 and the first wall 110 can be in an integrated structure, for example, when the first electrode terminal 14 is not assembled, the first connecting piece 16 can be protruding on the outer side of the first wall 110, and the third connecting segment 162 is formed by bending to fix the first electrode terminal 14.

[0198] In the above scheme, by arranging the first connecting piece 16 on the outer periphery of the first electrode terminal 14, on the one hand, the first electrode terminal 14 can be effectively fixed to the first wall 110, reducing the risk of the first electrode terminal 14 separating from the first wall 110 to cause the internal circuit of the battery monomer 10 to be disconnected, so that the battery monomer 10 has high reliability; on the other hand, by fixing the first electrode terminal 14 to the first wall 110 through the first connecting piece 16, the assembly difficulty of the battery monomer 10 can be effectively reduced, and the assembly rhythm of the first electrode terminal 14 is improved, thereby facilitating the improvement of the manufacturing efficiency of the battery monomer 10.

[0199] In some embodiments, the second electrode terminal 15 can also be fixed to the first wall 110 by the second connecting piece 17. The structure of the second connecting piece 17 is similar to that of the first connecting piece 16 described above, for example, the first wall 110 has a second through hole 1101, the second electrode terminal 15 is arranged through the second through hole 1101, the second connecting piece 17 is connected with the first wall 110, and the second connecting part abuts the second electrode terminal 15 on the first wall 110 to limit the position of the second electrode terminal 15 in the thickness direction z of the first wall.

[0200] According to some embodiments of the present application, the first connecting piece 16 is located on the side of the first wall 110 away from the electrode assembly 12 in the thickness direction z of the first wall.

[0201] The outer side of the first wall 110 can be the side of the first wall 110 away from the electrode assembly 12 in the thickness direction z of the first wall. In some embodiments, the first connecting piece 16 can be located on the outer side of the first wall 110 to not occupy the space inside the shell 11.

[0202] In the above scheme, the first connecting piece 16 is located on the outer side of the first wall 110, on the one hand, facilitating assembly operation, so that the robot or other assembly equipment can efficiently fix the first electrode terminal 14 to the first wall 110 through the first connecting piece 16; on the other hand, the space occupied by the first connecting piece 16 inside the battery monomer 10 can be reduced, so that the space utilization rate of the electrode assembly 12 is high, thereby facilitating the improvement of the volume energy density of the battery monomer 10 and the battery device 100.

[0203] According to some embodiments of the present application, the first connecting member 16 is connected with the first wall 110, and a first recess 1102 is formed on a side of the first wall 110 away from the electrode assembly 12 in the thickness direction z of the first wall 110, and the first recess 1102 is used to accommodate a portion of the first connecting member 16.

[0204] Referring to FIG. 6, the first connecting member 16 and the first wall 110 are in a split structure, and the first connecting member 16 is arranged outside the first wall 110. In some embodiments, the outer side surface of the first wall 110 is formed with a first recess 1102, and the shape of the first recess 1102 can correspond to the shape of the first connecting member 16. Optionally, the first connecting member 16 is annular, and the first recess 1102 can be an annular groove and is arranged around the first through hole 1100. A portion of the first connecting member 16 can be located in the first recess 1102 and welded with the groove bottom wall and / or the groove side wall of the first recess 1102.

[0205] Optionally, referring to FIG. 6, the outer side surface of the first wall 110 is formed with a second recess 1103, and the shape of the second recess 1103 can correspond to the shape of the second connecting member 17. Optionally, the second connecting member 17 is annular, and the second recess 1103 can be an annular groove and is arranged around the second through hole 1101. A portion of the second connecting member 17 can be located in the second recess 1103 and welded with the groove bottom wall and / or the groove side wall of the second recess 1103.

[0206] In the above scheme, by arranging the first recess 1102 outside the first wall 110, a portion of the first connecting member 16 can be accommodated, so that the first connecting member 16 can reasonably utilize the space in the thickness direction z of the first wall, so as to reduce the occupation of the external space by the first connecting member 16, facilitate the control of the overall volume of the battery monomer 10, and thus facilitate the improvement of the volume energy density of the battery monomer 10, and further facilitate the improvement of the volume energy density of the battery device 100.

[0207] According to some embodiments of the present application, referring to FIGS. 6 and 7, the first wall 110 includes a first through hole 1100, the first electrode terminal 14 includes a first terminal body 140 and a first flange 141 protruding from the outer peripheral surface of the first terminal body 140, at least a portion of the first terminal body 140 is arranged in the first through hole 1100, and at least a portion of the first flange 141 is located between the first connecting member 16 and the first wall 110 in the thickness direction z of the first wall.

[0208] The first through hole 1100 penetrates the first wall 110 in the thickness direction z of the first wall.

[0209] In some embodiments, the first electrode terminal 14 comprises a first terminal body 140 and a first flange 141, the first terminal body 140 can be a main part of the first electrode terminal 14, and the first flange 141 is annularly arranged along the circumference of the first terminal body 140 and protrudes outward from the circumference of the first terminal body 140.

[0210] Optionally, as shown in FIG. 6, the first terminal body 140 can be generally cylindrical. Optionally, as shown in FIG. 8, which is a perspective exploded view of the first wall 110 and the electrode terminal 13 in some other embodiments of the present application, in FIG. 8, the first terminal body 140 can be generally square.

[0211] In some embodiments, the first terminal body 140 and the first flange 141 can be an integral structure, for example, the first terminal body 140 and the first flange 141 are made by casting, die casting or other integral forming processes. In some other embodiments, the first terminal body 140 and the first flange 141 can be separate structures, for example, the first terminal body 140 and the first flange 141 are connected to each other by welding, bonding, riveting or threaded connection.

[0212] The “at least part of the first terminal body 140 is arranged in the first through hole 1100” can mean that the first terminal body 140 can be entirely located in the first through hole 1100, one end of the first terminal body 140 facing the inside of the shell 11 can be electrically connected to the electrode assembly 12, and the other end of the first terminal body 140 facing away from the inside of the shell 11 can be directly or indirectly connected to the external bus member.

[0213] Optionally, as shown in FIG. 7, along the thickness direction z of the first wall, part of the first terminal body 140 is located in the first through hole 1100, one end of the first terminal body 140 facing away from the electrode assembly 12 protrudes outward from the first wall 110, and the other end of the first terminal body 140 facing the electrode assembly 12 protrudes inward from the first wall 110.

[0214] The “at least part of the first flange 141 is located between the first connecting member 16 and the first wall 110 along the thickness direction z of the first wall” can mean that part of the first flange 141 is clamped and fixed by the first connecting member 16 and the first wall 110 along the thickness direction z of the first wall. Optionally, as shown in FIG. 7, part of the first flange 141 is located outward of the first wall 110, and the third connecting segment 162 of the first connecting member 16 is located on the side of the first flange 141 facing away from the first wall 110.

[0215] In the above scheme, the first electrode terminal 14 is simple in structure and easy to manufacture. By the constraint of the first flange 141 by the first wall 110 through the first connecting piece 16, the displacement of the first electrode terminal 14 along the thickness direction z of the first wall can be limited, so that the first electrode terminal 14 is effectively fixed to the first wall 110, the risk of separation of the first wall 110 and the electrode terminal 13 is reduced, and the reliability of the battery monomer 10 is improved, thereby improving the reliability of the battery device 100.

[0216] In some embodiments of the present application, the second electrode terminal 15 can include a second terminal body and a second flange, similar to the above description, the second flange protrudes from the outer peripheral surface of the second terminal body, and at least part of the second terminal body is arranged in the second through hole 1101, and at least part of the second flange is located between the second connecting piece 17 and the second wall along the thickness direction z of the first wall.

[0217] In some embodiments, the first electrode terminal 14 is fixed to the first wall 110 by the first connecting piece 16, and the second electrode terminal 15 is fixed to the first wall 110 by the second connecting piece 17. Taking the first electrode terminal 14 as an example, compared with the electrode terminal in the related art which adopts a riveting assembly relationship, under the condition of considering the overcurrent energy and the assembly effect, the size of the first through hole 1100 will be designed to be larger, which will cause a greater impact on the structural strength of the first wall 110. By limiting the values of the center distance a of the first electrode terminal 14 and the second electrode terminal 15 along the first direction x and the length b of the first wall 110, the anti-deformation ability under the condition of thinner thickness of the first wall 110 and larger opening size can be effectively improved, thereby reducing the risk of circuit disconnection between the electrode terminal 13 and the electrode assembly 12 caused by the impact of the internal expansion force of the battery monomer 10 on the first wall 110, improving the reliability of the battery monomer 10, and further improving the reliability of the battery device 100.

[0218] According to some embodiments of the present application, referring to FIGS. 6 and 7, the battery monomer 10 further includes a first sealing piece 18, at least part of the first sealing piece 18 is arranged between the first terminal body 140 and the hole wall of the first through hole 1100.

[0219] The first sealing piece 18 is a structural piece for forming a seal between the first terminal body 140 and the first through hole 1100. In some embodiments, the first sealing piece 18 can be a sealing ring.

[0220] The "at least part of the first sealing member 18 is arranged between the first terminal body 140 and the hole wall of the first through hole 1100" can be understood as that a part of the first sealing member 18 can be located between the first terminal body 140 and the hole wall of the first through hole 1100, or the entire first sealing member 18 is located between the first terminal body 140 and the hole wall of the first through hole 1100.

[0221] Optionally, referring to FIG. 7, a part of the first sealing member 18 can be located between the first terminal body 140 and the hole wall of the first through hole 1100, and another part of the first sealing member 18 can be located between the first wall 110 and the first flange 141. In some embodiments, a concave-convex structure is formed between the first sealing member 18 and the first wall 110 to play a limiting and positioning role.

[0222] In the above scheme, by arranging the first sealing member 18 between the first terminal body 140 and the hole wall of the first wall 110, on the one hand, the risk of leakage of the electrolyte between the first terminal body 140 and the hole wall of the first wall 110 can be reduced, and the reliability of the battery monomer 10 can be improved; on the other hand, the first terminal body 140 and the first wall 110 can be insulated and isolated by the first sealing member 18, the risk of internal short circuit of the battery monomer 10 can be reduced, and then the reliability of the battery monomer 10 can be improved.

[0223] In some embodiments of the present application, the battery monomer 10 further comprises a second sealing member 18a, at least part of the second sealing member 18a is arranged between the second terminal body and the hole wall of the second through hole 1101.

[0224] According to some embodiments of the present application, referring to FIGS. 6 and 7, the battery monomer 10 further comprises a first insulating member 19, at least part of the first insulating member 19 is arranged between the first connecting member 16 and the first electrode terminal 14.

[0225] The first insulating member 19 is a structural member with insulating properties, which has the effect of insulating and isolating the first connecting member 16 and the first electrode terminal 14. Exemplarily, the material of the first insulating member 19 includes but is not limited to polyphenylene sulfide, polytetrafluoroethylene, polypropylene and polycarbonate. In some embodiments, the first insulating member 19 can be a plastic.

[0226] Optionally, the first insulating member 19 can be arranged between the first connecting member 16 and the first electrode terminal 14 as a whole, for example, the first insulating member 19 can be arranged between the first connecting segment 160 and the first flange 141, between the second connecting segment 161 and the first flange 141, and between the third connecting segment 162 and the first flange 141.

[0227] Optionally, a portion of the first insulation member 19 can be arranged between the first connecting member 16 and the first electrode terminal 14, and another portion of the first insulation member 19 wraps the portion of the first terminal body 140 exposed to the outside and wraps the first connecting member 16 away from the periphery of the first terminal body 140.

[0228] In the above scheme, by arranging the first insulation member 19 between the first connecting member 16 and the electrode terminal 13, the risk of the first electrode terminal 14 conducting with the first outer wall through the first connecting member 16, resulting in internal short circuit of the battery monomer 10, can be reduced, thereby improving the reliability of the battery monomer 10, and further facilitating the improvement of the reliability of the battery monomer 10.

[0229] In some embodiments, the battery monomer 10 further comprises a second insulation member, at least a portion of the second insulation member is arranged between the second connecting member 17 and the second electrode terminal 15.

[0230] According to some other embodiments of the present application, the first wall 110 is integrally formed with the first connecting member 16.

[0231] In some other embodiments of the present application, the first wall 110 and the first connecting member 16 are integrally formed by a molding process such as casting, die casting, stamping, etc. Optionally, the first connecting member 16 forms the third connecting segment 162 by bending to fix the first electrode terminal 14 to the first wall 110.

[0232] In the above scheme, by arranging the first wall 110 and the first connecting member 16 to be integrally formed, on the one hand, the structural strength of the first wall 110 and the first connecting member 16 can be high, which is beneficial to the improvement of the structural stability of the battery monomer 10, and the reliability of the battery monomer 10 is high; on the other hand, since the first wall 110 and the first connecting member 16 are an integral structure, the process of assembling parts can be reduced, the manufacturing rhythm of the battery monomer 10 can be improved, and the manufacturing efficiency of the battery monomer 10 can be improved.

[0233] According to some other embodiments of the present application, please refer to FIG. 9-FIG. 11, FIG. 9 is a structural schematic diagram of the first wall 110 and the electrode terminal 13 in some other embodiments of the present application, FIG. 10 is a perspective exploded view of the first wall 110 and the electrode terminal 13 in some other embodiments of the present application, and FIG. 11 is a structural schematic diagram of the internal structure of the first wall 110 and the first electrode terminal 14 in some other embodiments of the present application.

[0234] The first wall 110 has a first through hole 1100, the first electrode terminal 14 includes a first pole 142 and a first conductive piece 143, along the thickness direction z of the first wall, the first conductive piece 143 is located on the side of the first wall 110 facing away from the electrode assembly 12, a part of the first pole 142 is located on the side of the first wall 110 facing the electrode assembly 12, and another part of the first pole 142 penetrates the through hole and is connected with the first conductive piece 143.

[0235] In some embodiments, the first electrode terminal 14 includes the first pole 142 and the first conductive piece 143 connected with each other. Along the thickness direction z of the first wall, the end of the first pole 142 facing away from the first conductive piece 143 is used for electrical connection with the electrode assembly 12, for example, the end of the first pole 142 facing away from the first conductive piece 143 is connected with the tab of the electrode assembly 12 through the first adapter 120. The first conductive piece 143 is located on the side of the first wall 110 facing away from the electrode assembly 12, and the first conductive piece 143 can be used to limit the first pole 142 from separating from the first wall 110.

[0236] Optionally, the first pole 142 can include a columnar body 1420 and a plate-shaped base 1421, the columnar body 1420 can penetrate the first through hole 1100, and the size of the plate-shaped base is greater than the size of the first through hole 1100. The plate-shaped base is located on the inner side of the first wall 110 to be electrically connected with the electrode assembly 12, and the first conductive piece 143 can be a plate-shaped piece, the size of the first conductive piece 143 is greater than the size of the first through hole 1100, the columnar body 1420 penetrates the first through hole 1100 and is connected with the first conductive piece 143.

[0237] In some embodiments, the connection relationship between the first pole 142 and the first conductive piece 143 includes, but is not limited to, bonding, welding, riveting or threaded connection. Optionally, a riveting hole is provided on the first conductive piece 143, and the first pole penetrates the riveting hole and is riveted with the first conductive piece 143.

[0238] In the above scheme, the first electrode terminal 14 includes the first pole 142 and the first conductive piece 143, and through the mutual connection of the first pole 142 and the first conductive piece 143, the first electrode terminal 14 can be stably installed on the first wall 110, the risk of separation between the first wall 110 and the first electrode terminal 14 is reduced, the battery monomer 10 has higher reliability, and the battery device 100 has higher reliability.

[0239] In some embodiments, the structure of the second electrode terminal 15 is similar to that of the first electrode terminal 14 described above, and the second electrode terminal 15 includes a second pole 150 and a second conductive piece 151. In the thickness direction z of the first wall 110, the second conductive piece 151 is located on the side of the first wall 110 facing away from the electrode assembly 12, and a portion of the second pole 150 is located on the side of the first wall 110 facing the electrode assembly 12, and another portion of the second pole 150 penetrates the second through hole 1101 and is connected with the second conductive piece.

[0240] According to some embodiments of the present application, referring to FIGS. 10 and 11, the battery monomer 10 further includes a first sealing piece 18, at least a portion of the first sealing piece 18 is arranged between the first pole 142 and the hole wall of the first through hole 1100.

[0241] The first sealing piece 18 is a structural piece for forming a seal between the first pole 142 and the first through hole 1100. In some embodiments, the first sealing piece 18 can be a sealing ring.

[0242] The "at least a portion of the first sealing piece 18 is arranged between the first pole 142 and the hole wall of the first through hole 1100" can be understood as that a portion of the first sealing piece 18 can be located between the first pole 142 and the hole wall of the first through hole 1100, or the entire first sealing piece 18 is located between the first pole 142 and the hole wall of the first through hole 1100.

[0243] Optionally, referring to FIG. 11, a portion of the first sealing piece 18 can be located between the columnar body 1420 and the hole wall of the first through hole 1100, and another portion of the first sealing piece 18 can be located between the inner side surface of the first wall 110 and the plate-shaped base 1421 of the first pole 142.

[0244] In the above scheme, by arranging the first sealing piece 18 between the first pole 142 and the hole wall of the first through hole 1100, on the one hand, the risk of leakage of the electrolyte between the first pole 142 and the hole wall of the first through hole 1100 can be reduced, and the reliability of the battery monomer 10 can be improved; on the other hand, the first pole 142 and the first wall 110 can be insulated and isolated by the first sealing piece 18, the risk of internal short circuit of the battery monomer 10 can be reduced, and thus the reliability of the battery monomer 10 can be improved.

[0245] According to some embodiments of the present application, the battery monomer 10 further includes a first insulation piece 19, at least a portion of the first insulation piece 19 is arranged between the first wall 110 and the first conductive piece 143.

[0246] The first insulating member 19 is a structural member having insulating properties, and functions to insulate the first conductive member 143 and the first wall 110. Exemplarily, the material of the first insulating member 19 includes, but is not limited to, polyphenylene sulfide, polytetrafluoroethylene, polypropylene, and polycarbonate. In some embodiments, the first insulating member 19 can be a plastic.

[0247] Optionally, the first insulating member 19 can be disposed between the first conductive member 143 and the first wall 110.

[0248] Optionally, a portion of the first insulating member 19 can be disposed between the first conductive member 143 and the first wall 110, and another portion of the first insulating member 19 can surround at least a portion of the outer circumferential surface of the first conductive member 143.

[0249] In the above scheme, by disposing the first insulating member 19 between the first wall 110 and the first conductive member 143, the risk of the first electrode end being in conductive communication with the first wall 110 and causing internal short circuit of the battery monomer 10 can be reduced, thereby improving the reliability of the battery monomer 10, and further facilitating the improvement of the reliability of the battery monomer 10.

[0250] According to some embodiments of the present application, some embodiments of the present application further provide a battery device 100, comprising the battery monomer 10 provided in the first aspect.

[0251] According to some embodiments of the present application, some embodiments of the present application further provide a power consuming device, comprising the battery monomer 10 provided in the first aspect and / or the battery device 100 provided in the second aspect, and the battery monomer 10 is used to provide electric energy.

[0252] According to some embodiments of the present application, a battery device 100 is further provided, comprising the battery monomer 10 described above.

[0253] Please refer to FIG. 2, the battery device 100 comprises the battery monomer 10 and the box 20, and the battery monomer 10 is contained in the box 20.

[0254] Optionally, a plurality of battery monomer assemblies are disposed in the box 20, each battery monomer assembly comprises a plurality of battery monomers 10 stacked with each other, and the plurality of battery monomers 10 are connected in series with each other through the busbar component. In some embodiments, the plurality of battery monomer assemblies can be connected in series with each other through the busbar component.

[0255] According to some embodiments of the present application, a power consuming device is further provided, comprising the battery monomer 10 provided above, and / or the battery device 100 provided above. The battery monomer 10 provided above and / or the battery device 100 provided above are used to provide electric energy.

[0256] Optionally, the electric device is a vehicle 1000, the battery cell 10 can serve as a driving power source of the vehicle 1000, and / or control the power source.

[0257] According to some embodiments of the present application, a battery cell 10 is provided, please refer to FIG. 3-FIG. 11.

[0258] The battery cell 10 includes a housing 11, an electrode assembly 12, and an electrode terminal 13 including a first electrode terminal 14 and a second electrode terminal 15 with opposite polarities. The housing 11 has a first wall 110, which can be made of steel, and has a thickness greater than or equal to 0.2 mm and less than or equal to 1.5 mm. The electrode assembly 12 is disposed in the housing 11. The first electrode terminal 14 and the second electrode terminal 15 are spaced apart along a first direction x on the first wall 110, and are respectively electrically connected to the electrode assembly 12, the first direction x being the length direction of the first wall 110. Wherein, along the first direction x, the center distance of the first electrode terminal 14 and the second electrode terminal 15 is a, and the length of the first wall 110 is b, satisfying a / b≤94.4%.

[0259] In different specifications of the battery cell 10, the length b of the first wall 110 is different, and correspondingly, the value range of the center distance a of the first electrode terminal 14 and the second electrode terminal 15 is also different.

[0260] Exemplarily, specification one, when the length b of the first wall 110 is greater than or equal to 177 mm and less than 210 mm, a / b≤94.4% is satisfied; optionally, along the first direction x, the center distance a of the first electrode terminal 14 and the second electrode terminal 15 is greater than or equal to 106 mm and less than or equal to 160 mm; optionally, in some embodiments, 50.4%≤a / b≤76.2% can be satisfied.

[0261] Specification two, when the length b of the first wall 110 is greater than or equal to 210 mm and less than 240 mm, a / b≤92.4% is satisfied; optionally, along the first direction x, the center distance a of the first electrode terminal 14 and the second electrode terminal 15 is greater than or equal to 135 mm and less than or equal to 194 mm, optionally, in some embodiments, 56.2%≤a / b≤80.9% can be satisfied.

[0262] Specification three, when the length b of the first wall 110 is greater than or equal to 240 mm and less than 270 mm, a / b≤88.8% is satisfied; optionally, along the first direction x, the center distance a of the first electrode terminal 14 and the second electrode terminal 15 is greater than or equal to 156 mm and less than or equal to 213 mm, optionally, in some embodiments, 57.7%≤a / b≤78.9% can be satisfied.

[0263] In the fourth specification, when the length b of the first wall 110 is greater than or equal to 270 mm and less than or equal to 320 mm, a / b is less than or equal to 85.2%, and the center distance a of the first electrode terminal 14 and the second electrode terminal 15 along the first direction x is greater than or equal to 170 mm and less than or equal to 230 mm, optionally, in some embodiments, 55.5%≤a / b≤71.9% can be met.

[0264] In some embodiments, in the four specifications of the battery cell 10 provided above, the ratio a / b of the center distance a of the first electrode terminal 14 and the second electrode terminal 15 and the length b of the first wall 110 along the first direction x can meet 40%≤a / b≤90%, 50%≤a / b≤85%, 50%≤a / b≤82%, 50%≤a / b≤79% or 50%≤a / b≤75%.

[0265] In some embodiments, the first wall 110 can be an end cover of the shell 11, and the first wall 110 is connected with the shell body 111 of the shell 11 to close the first opening of the shell body 111, so that the electrode assembly 12 is in a closed space.

[0266] In some embodiments, the electrode terminal 13 can be fixed on the first wall 110 by a connector, such as a welding ring. In other embodiments, the electrode terminal 13 can include a pole and a conductive piece, and is fixed on the first wall 110 by riveting of the pole and the conductive piece.

[0267] The above is only the preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, wherein, include: The outer shell has a first wall, the first wall being made of steel, and the thickness of the first wall being greater than or equal to 0.2 mm and less than or equal to 1.5 mm. Electrode assembly, disposed within the housing; A first electrode terminal and a second electrode terminal with opposite polarities are disposed at intervals on the first wall along a first direction. The first electrode terminal and the second electrode terminal are electrically connected to the electrode assembly, and the first direction is the length direction of the first wall. Along the first direction, the center distance between the first electrode terminal and the second electrode terminal is a, and the length of the first wall is b, satisfying 40% ≤ a / b ≤ 90%.

2. The battery cell according to claim 1, wherein, The length b of the first wall is greater than or equal to 170 mm and less than 210 mm, and along the first direction, the center distance a between the first electrode terminal and the second electrode terminal is greater than or equal to 105 mm and less than or equal to 160 mm.

3. The battery cell according to claim 1 or 2, wherein, The length b of the first wall is greater than or equal to 170 mm and less than 210 mm, satisfying 50% ≤ a / b ≤ 85%.

4. The battery cell according to claim 1, wherein, The length b of the first wall is greater than or equal to 210 mm and less than 240 mm, and along the first direction, the center distance a between the first electrode terminal and the second electrode terminal is greater than or equal to 120 mm and less than or equal to 190 mm.

5. The battery cell according to claim 1 or 4, wherein, The length b of the first wall is greater than or equal to 210 mm and less than 240 mm, satisfying 50% ≤ a / b ≤ 82%.

6. The battery cell according to claim 1, wherein, The length b of the first wall is greater than or equal to 240 mm and less than 270 mm, and along the first direction, the center distance a between the first electrode terminal and the second electrode terminal is greater than or equal to 135 mm and less than or equal to 213 mm.

7. The battery cell according to claim 1 or 6, wherein, The length b of the first wall is greater than or equal to 240 mm and less than 270 mm, satisfying 50% ≤ a / b ≤ 79%.

8. The battery cell according to claim 1, wherein, The length b of the first wall is greater than or equal to 270 mm and less than or equal to 320 mm, and along the first direction, the center distance a between the first electrode terminal and the second electrode terminal is greater than or equal to 170 mm and less than or equal to 230 mm.

9. The battery cell according to claim 1 or 8, wherein, The length b of the first wall is greater than or equal to 270 mm and less than or equal to 320 mm, satisfying 50% ≤ a / b ≤ 75%.

10. The battery cell according to any one of claims 1-9, wherein, The thickness of the first wall is greater than or equal to 0.5 mm and less than or equal to 1.3 mm.

11. The battery cell according to any one of claims 1-10, wherein, The housing includes a shell and an end cap, the shell having a first opening, and the end cap being connected to the shell and closing the first opening; The first wall is the end cap, and the thickness of the first wall is greater than the thickness of the shell.

12. The battery cell according to claim 11, wherein, The shell is made of steel, and its thickness is not less than 0.075 mm and not more than 0.35 mm.

13. The battery cell according to claim 12, wherein, The thickness of the shell is not less than 0.15 mm and not more than 0.25 mm.

14. The battery cell according to any one of claims 1-13, wherein, The battery cell further includes a first connector, which is at least partially disposed on the outer periphery of the first electrode terminal, and is used to fix the first electrode terminal to the first wall.

15. The battery cell according to claim 14, wherein, Along the thickness direction of the first wall, the first connector is located on the side of the first wall opposite to the electrode assembly.

16. The battery cell according to claim 15, wherein, The first connector is connected to the first wall. Along the thickness direction of the first wall, a first groove is formed on the side of the first wall opposite to the electrode assembly. The first groove is used to accommodate a portion of the first connector.

17. The battery cell according to any one of claims 14-16, wherein, The first wall includes a first through hole, the first electrode terminal includes a first terminal body and a first flange, the first flange protrudes from the outer peripheral surface of the first terminal body, at least a portion of the first terminal body is disposed in the first through hole, and at least a portion of the first flange is located between the first connector and the first wall along the thickness direction of the first wall.

18. The battery cell according to claim 17, wherein, The battery cell further includes a first seal, at least a portion of which is disposed between the first terminal body and the wall of the first through hole.

19. The battery cell according to any one of claims 14-18, wherein, The battery cell further includes a first insulating member, at least a portion of which is disposed between the first connector and the first electrode terminal.

20. The battery cell according to any one of claims 14-19, wherein, The first wall and the first connector are integrally formed.

21. The battery cell according to any one of claims 1-13, wherein, The first wall has a first through hole, and the first electrode terminal includes a first electrode post and a first conductive element. Along the thickness direction of the first wall, the first conductive element is located on the side of the first wall away from the electrode assembly, a portion of the first electrode post is located on the side of the first wall facing the electrode assembly, and another portion of the first electrode post passes through the first through hole and is connected to the first conductive element.

22. The battery cell according to claim 21, wherein, The battery cell further includes a first sealing element, at least a portion of which is disposed between the first electrode post and the wall of the first through hole.

23. The battery cell according to claim 21 or 22, wherein, The battery cell further includes a first insulating member, at least a portion of which is disposed between the first wall and the first conductive member.

24. A battery device, wherein, Includes the battery cell described in any one of claims 1-23.

25. An electrical appliance, wherein, Includes the battery cell according to any one of claims 1-23, and / or the battery device according to claim 24, wherein the battery cell is used to provide electrical energy.

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