Battery cell, battery device, and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, a shell comprises a shell main body and a cover body, and the cover body is provided with a first pole and a second pole; a first tab and a second tab are formed on the electrode assembly; the first electric connecting piece is connected with the first pole and the first tab; and the second electric connecting piece is connected with the second pole and the second tab. The first tabs and the second tabs are formed at the end parts of the electrode assemblies in the second direction, so that the flowing path of current in the battery monomer is reasonable, the uniformity of the current and the current density is favorably improved, the local overheating risk of the battery monomer is reduced, and the charging performance and the quick charging performance of the battery monomer are effectively improved; at least parts of the first electric connecting piece and the second electric connecting piece are located between the electrode assembly and the shell main body, so that the electrode assembly can be limited by the first electric connecting piece and the second electric connecting piece, the shaking risk of the electrode assembly in the shell is reduced, the use safety of the battery monomer is improved, and the service life of the battery monomer is prolonged.

Description

TECHNICAL FIELD

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

[0002] In the related art, the cold plate is arranged to improve the heat dissipation of the battery monomer, thereby improving the fast charging performance of the battery monomer. However, when the length of the pole piece of the battery monomer is relatively long, the distribution of the current in the battery monomer is uneven, and the current density distribution of the electrode assembly is uneven, which leads to poor charging performance of the battery monomer and poor fast charging performance. In addition, the electrode assembly is not firmly fixed in the shell, and the electrode assembly is prone to shaking. The shaking of the electrode assembly in the shell affects the safety and service life of the battery monomer. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the prior art. To this end, one object of the present application is to provide a battery monomer to improve the uniformity of the distribution of the current in the battery monomer, improve the charging performance of the battery monomer, and reduce the risk of shaking of the electrode assembly in the shell.

[0004] The present application further provides a battery device.

[0005] The present application further provides a power consumption device.

[0006] In a first aspect, the embodiments of the present application provide a battery monomer, comprising: a shell, the shell comprising a shell main body and a cover body, the shell main body and the cover body being fixedly connected to jointly define a mounting cavity, the cover body being provided with a first pole and a second pole; an electrode assembly, the electrode assembly being arranged in the mounting cavity, the electrode assembly and the cover body being arranged along a first direction, and along a second direction, an end portion of the electrode assembly being formed with a first tab and a second tab, the first direction being perpendicular to the second direction; a first electrical connecting member, the first electrical connecting member being arranged in the mounting cavity, at least a portion of the first electrical connecting member being located between the end portion of the electrode assembly provided with the first tab and the shell main body, the first electrical connecting member being connected with the first pole and the first tab; and a second electrical connecting member, the second electrical connecting member being arranged in the mounting cavity, and at least a portion of the second electrical connecting member being located between the end portion of the electrode assembly provided with the second tab and the shell main body, the second electrical connecting member being connected with the second pole and the second tab.

[0007] In the technical scheme, the end of the electrode assembly along the second direction is provided with the first tab and the second tab, the flow path of the current in the battery monomer can be reasonable, the uniformity of the current and the current density can be improved, the risk of local overheating of the battery monomer can be reduced, the charging performance and the fast charging performance of the battery monomer can be effectively improved, at least part of the first electric connecting piece and the second electric connecting piece is located between the electrode assembly and the shell main body, the electrode assembly can be limited by the first electric connecting piece and the second electric connecting piece, the risk of shaking of the electrode assembly in the shell can be reduced, and the use safety and the service life of the battery monomer can be improved.

[0008] In some embodiments, the first electric connecting piece comprises a first limiting wall, at least one end of the electrode assembly along the second direction is provided with the first tab, and the first limiting wall is arranged between the end of the electrode assembly provided with the first tab and the shell main body and connected with the corresponding first tab.

[0009] In the technical scheme, the first limiting wall is arranged between the end of the electrode assembly provided with the first tab and the shell main body and connected with the corresponding first tab, the position of the first limiting wall can be reasonable, the electrode assembly can be limited by the first limiting wall, the risk of the electrode assembly along the second direction can be reduced, the risk of the insulating film being damaged due to the electrode assembly shaking can be reduced, the risk of the internal short circuit of the battery monomer due to the direct contact between the electrode assembly and the shell main body can be reduced, and the use safety and the service life of the battery monomer can be improved.

[0010] In some embodiments, the end of the electrode assembly provided with the first tab is provided with a plurality of first tabs.

[0011] In the technical scheme, the end of the electrode assembly provided with the first tab is provided with a plurality of first tabs, the current channel in the electrode assembly can be increased, the current in the battery monomer can be more uniformly distributed, the local current density can be effectively reduced, the safety risk such as local overheating of the battery monomer can be reduced, the charging and discharging capacity of the battery monomer can be improved, and the fast charging performance of the battery monomer can be improved. The use reliability of the electrode assembly can also be improved, when one of the first tabs fails due to aging, the other first tab can continue to play an electrically conductive role, so that the current of the electrode assembly can be transmitted to the first electric connecting piece through the first tab and then output to the external circuit through the first pole, thereby improving the use reliability of the battery monomer and effectively prolonging the service life of the battery monomer.

[0012] In some embodiments, at least part of the plurality of first tabs located at the same end of the electrode assembly is arranged along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; and / or

[0013] At least part of the plurality of first tabs located at the same end of the electrode assembly is arranged in a first direction.

[0014] In the above technical solution, by arranging at least part of the plurality of first tabs located at the same end of the electrode assembly in a third direction, and arranging at least part of the plurality of first tabs located at the same end of the electrode assembly in a first direction, the end of the electrode assembly is arranged with a plurality of first tabs in the first direction and the third direction, which can improve the uniformity of the arrangement of the first tabs at the end of the electrode assembly, and facilitate uniform current transmission through the plurality of first tabs, thereby making the current more evenly distributed inside the battery monomer, effectively reducing the local current density, reducing the risk of local overheating of the battery monomer, and improving the charging and discharging capacity of the battery monomer, and improving the fast charging performance of the battery monomer.

[0015] In some embodiments, an edge of the first limiting wall forms a first connecting portion, and the first connecting portion is connected with the corresponding first tab.

[0016] In the above technical solution, by forming a first connecting portion at the edge of the first limiting wall, and connecting the first connecting portion with the corresponding first tab, the first connecting portion is conveniently connected with the corresponding first tab, which can improve the assembly efficiency, and the first tab and the first electrical connecting piece can be connected through the first connecting portion, thereby realizing the effect of connecting the first tab and the first pole through the first electrical connecting piece, and facilitating the electrode assembly to be discharged in turn through the first tab, the first electrical connecting piece and the first pole, or the current to charge the electrode assembly in turn through the first pole, the first electrical connecting piece and the first tab, thereby realizing the effect of charging or discharging the battery monomer as needed.

[0017] Further, since the first electrical connecting piece usually has high conductivity and good heat dissipation performance, the first pole and the first tab are connected through the first electrical connecting piece, which can make the current flow smoothly between the first tab and the first pole, thereby reducing the energy loss of the battery monomer, and also facilitating the current density of the electrode assembly to be more evenly distributed, thereby reducing the risk of local overheating of the battery monomer, effectively improving the charging performance of the battery monomer, and further improving the fast charging performance of the battery monomer.

[0018] In some embodiments, the first electrical connecting piece further comprises a first connecting wall located between the cover body and the electrode assembly, and the first connecting wall is connected with the first limiting wall and the first pole.

[0019] In the technical scheme, the first connecting wall is located between the cover body and the electrode assembly, and the first connecting wall is connected with the first limiting wall and the first pole column, so that the risk of movement of the electrode assembly in the first direction is reduced, the stability of the electrode assembly is improved, the risk of damage of the insulation film caused by movement of the electrode assembly is reduced, the risk of internal short circuit of the battery cell caused by direct contact between the electrode assembly and the shell main body is reduced, and the use safety and service life of the battery cell are improved. The first tab and the first pole column are connected through the first electric connecting piece, so that the electrode assembly can be discharged through the first tab, the first electric connecting piece and the first pole column in sequence, or the current can charge the electrode assembly through the first pole column, the first electric connecting piece and the first tab in sequence, and the battery cell can be charged or discharged as needed.

[0020] In some embodiments, an end face of the first connecting wall facing the first pole column is formed with a connecting boss, and the connecting boss is connected with the first pole column.

[0021] In the technical scheme, the end face of the first connecting wall facing the first pole column is formed with the connecting boss, and the connecting boss is connected with the first pole column, so that the position of the connecting boss is reasonable, the connecting boss and the first pole column are connected through the connecting boss, the connection difficulty of the first connecting wall and the first pole column is reduced, and the assembly efficiency of the battery cell is improved.

[0022] In some embodiments, the cover body comprises a first cover body and a second cover body, the first cover body and the second cover body are opposite and spaced apart in the first direction, the shell main body is connected between the first cover body and the second cover body, the first cover body is provided with the first pole column, the second cover body is provided with the second pole column, part of the first electric connecting piece is located between the first cover body and the electrode assembly, and part of the second electric connecting piece is located between the second cover body and the electrode assembly.

[0023] In the technical solution, the first cover body is provided with the first pole column, the second cover body is provided with the second pole column, part of the first electric connecting piece is located between the first cover body and the electrode assembly, and part of the second electric connecting piece is located between the second cover body and the electrode assembly, so that the first connecting wall of the first electric connecting piece is connected with the first pole column, the second electric connecting piece is connected with the second pole column, the first pole column and the second pole column are arranged on different cover bodies, the space arrangement of the battery monomer is optimized, the first pole column and the second pole column are electrically isolated, the electrical interference and short circuit risk in the battery monomer are reduced, and the safety and reliability of the battery monomer are improved. In addition, during the charging and discharging of the battery monomer, the current flows into or out of the battery monomer through the first pole column and the second pole column, the first pole column and the second pole column are distributed on different cover bodies, the current can be more effectively distributed, the problem of excessive local current density of the battery monomer is reduced, the heat accumulation and temperature rise risk in the battery monomer are reduced, the charging performance of the battery monomer is effectively improved, and the fast charging performance of the battery monomer is improved.

[0024] In some embodiments, along the second direction, the shell body has a mounting wall, the mounting wall is provided with an explosion-proof structure and / or a liquid injection hole.

[0025] In the technical solution, the explosion-proof structure is arranged on the mounting wall, so that the position of the explosion-proof structure is reasonable. Since the gap between the electrode assembly and the shell body is small, the gap between the electrode assembly and the cover body is greater than or slightly greater than the gap between the electrode assembly and the shell body. Compared with arranging the explosion-proof structure on the cover body, the gas generated by the electrode assembly can flow through the gap between the electrode assembly and the cover body, which is beneficial to reducing the flow difficulty of the gas, thereby improving the exhaust efficiency of the battery monomer, reducing the risk of accumulation of high-pressure gas in the battery monomer, and further reducing the explosion risk of the battery monomer.

[0026] When the internal pressure of the battery monomer exceeds a certain limit, the explosion-proof structure will automatically open to release the high-pressure gas, thereby reducing the risk of explosion of the battery monomer due to excessive internal pressure. Further, the design of the explosion-proof structure can also effectively prevent liquid leakage of the battery monomer, thereby reducing the risk of damage to the battery monomer and the user caused by the leakage of electrolyte, and improving the use safety of the battery monomer. By arranging the liquid injection hole on the mounting wall, the difficulty of liquid injection of the battery monomer is reduced, thereby improving the production efficiency or maintenance efficiency of the battery monomer, and a faster infiltration rate can also be achieved.

[0027] In some embodiments, the second electric connecting piece comprises: a second limiting wall, along the second direction, at least one end of the electrode assembly is provided with a second tab, and the second limiting wall is arranged between the end of the electrode assembly provided with the second tab and the shell body, and the second limiting wall is connected with the corresponding second tab.

[0028] In the technical scheme, the second limiting wall is connected with the corresponding second tab, and the second limiting wall is arranged reasonably, which is beneficial to limiting the electrode assembly by the second limiting wall, reduces the risk of the electrode assembly moving along the second direction, thereby reducing the risk of the electrode assembly moving to cause the insulating film to be damaged, and is beneficial to reducing the risk of the electrode assembly and the shell body directly contacting to cause internal short circuit of the battery monomer, thereby improving the use safety and service life of the battery monomer.

[0029] In some embodiments, the structure of the second electrical connector is the same as the structure of the first electrical connector.

[0030] In the technical scheme, the structure of the second electrical connector is the same as the structure of the first electrical connector, which can make the structure of the second electrical connector reasonable, and the second electrical connector and the first electrical connector can be machined by the same mold, thereby reducing the number of molds in the production process of the battery monomer, and reducing the production cost of the battery monomer. Moreover, without distinguishing the structures of the first electrical connector and the second electrical connector, the first electrical connector or the second electrical connector can be connected between the first tab and the first pole and between the second tab and the second pole, which is beneficial to reducing the risk of reverse installation of the first electrical connector and the second electrical connector, thereby reducing the assembly difficulty of the battery monomer, and improving the production efficiency of the battery monomer.

[0031] In a second aspect, the embodiments of the present application further provide a battery device, comprising the battery monomer.

[0032] In a third aspect, the embodiments of the present application further provide a power utilization device, comprising the battery device.

[0033] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:

[0035] Figure 1 A structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0036] Figure 2 An exploded view of a battery device is provided for some embodiments of the present application;

[0037] Figure 3 A structural schematic diagram of a battery monomer is provided for some embodiments of the present application;

[0038] Figure 4An exploded view of the battery cell (first embodiment) provided for some embodiments of the present application;

[0039] Figure 5 A structural schematic view of the shell body (first embodiment) provided for some embodiments of the present application;

[0040] Figure 6 An assembly schematic view of the cover, the first electrical connector, the second electrical connector, and the electrode assembly (first embodiment) provided for some embodiments of the present application;

[0041] Figure 7 An exploded view of the cover, the first electrical connector, the second electrical connector, and the electrode assembly (first embodiment) provided for some embodiments of the present application;

[0042] Figure 8 An assembly schematic view of the first electrical connector and the first cover (first embodiment) provided for some embodiments of the present application;

[0043] Figure 9 An exploded view of the first electrical connector and the first cover (first embodiment) provided for some embodiments of the present application;

[0044] Figure 10 An exploded view of the battery cell (second embodiment) provided for some embodiments of the present application;

[0045] Figure 11 An assembly schematic view of the cover, the first electrical connector, the second electrical connector, and the electrode assembly (second embodiment) provided for some embodiments of the present application;

[0046] Figure 12 A structural schematic view of the electrode assembly (second embodiment) provided for some embodiments of the present application;

[0047] Figure 13 An exploded view of the first electrical connector and the first cover (second embodiment) provided for some embodiments of the present application.

[0048] Reference signs:

[0049] Vehicle 1000;

[0050] Battery device 100; controller 200; motor 300;

[0051] Box 201; first box 202; second box 203;

[0052] Battery cell 400;

[0053] Housing 1; shell body 11; mounting wall 111; explosion-proof structure 112; liquid injection hole 113;

[0054] Cover 12; first pole column 121; second pole column 122; first cover 123; second cover 124; mounting cavity 13;

[0055] Electrode assembly 2; first tab 21; second tab 22;

[0056] First electrical connection 3; first limiting wall 31; first connecting part 311; first connecting wall 32; connecting boss 321;

[0057] Second electrical connection 4; second limiting wall 41; second connecting part 411; second connecting wall 42;

[0058] Insulating film 5; avoiding hole 71; PET sheet 6; plastic part 7; support structure 8. DETAILED DESCRIPTION

[0059] 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 in conjunction with 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.

[0060] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, 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, and are not intended to describe a particular order or primary and secondary relationship.

[0061] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction 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.

[0062] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mount", "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.

[0063] 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, B and / or C can represent three cases of B alone, B and C together, and C alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0064] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0065] "Multiple" appearing in the present application means two or more (including two).

[0066] 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.

[0067] 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.

[0068] 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, parallel or mixed connection through a busbar component.

[0069] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells.

[0070] As an example, the battery cell assembly can be a battery module. The battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells by a cable tie.

[0071] In some embodiments, the battery device can be a battery pack. The battery pack includes a box and one or more battery cell assemblies. The battery cell assemblies are accommodated in the box.

[0072] As an example, the battery cell assembly can be a battery module. The battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0073] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells to the box.

[0074] As an example, the box can include a first box and a second box. The first box and the second box are buckled so that the inside of the box forms a closed space to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0075] 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 the inside of the box forms a closed space to accommodate the battery cell assembly.

[0076] In some embodiments, the box can be part of the chassis structure of the vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0077] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships, and spacecraft, such as aircraft, rockets, space shuttles, and spacecraft.

[0078] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, power batteries play an irreplaceable important role as the power source of electric vehicles. The battery device is composed of a box and a plurality of battery cells accommodated in the box. Among them, the battery device as a core component of new energy vehicles has high requirements on reliability and cycle life.

[0079] In the related art, the battery monomer is improved in heat dissipation by setting a cold plate, so as to improve the fast charging performance of the battery monomer. However, when the length of the pole piece of the battery monomer is relatively long, the current is not uniformly distributed in the battery monomer, and the current density of the electrode assembly is not uniformly distributed, which leads to poor charging performance of the battery monomer and poor fast charging performance. In addition, the electrode assembly is not firmly fixed in the shell, and the electrode assembly is prone to shaking. The shaking of the electrode assembly in the shell will affect the safety and service life of the battery monomer.

[0080] Based on the above considerations, in order to solve the technical problems of poor charging performance of the battery monomer and easy shaking of the electrode assembly. The application provides a battery monomer, which comprises: a shell, the shell comprises a shell main body and a cover body, the shell main body and the cover body are fixedly connected to jointly define a mounting cavity, and the cover body is provided with a first pole and a second pole; an electrode assembly arranged in the mounting cavity, the electrode assembly and the cover body are arranged along a first direction, and the end of the electrode assembly is provided with a first lug and a second lug along a second direction, and the first direction and the second direction are perpendicular; a first electrical connecting piece arranged in the mounting cavity, at least part of the first electrical connecting piece is located between the end of the electrode assembly provided with the first lug and the shell main body, and the first electrical connecting piece is connected with the first pole and the first lug; and a second electrical connecting piece arranged in the mounting cavity, at least part of the second electrical connecting piece is located between the end of the electrode assembly provided with the second lug and the shell main body, and the second electrical connecting piece is connected with the second pole and the second lug.

[0081] In such a battery monomer, by forming the first lug and the second lug at the end of the electrode assembly along the second direction, the flow path of the current in the battery monomer can be reasonably arranged, which is conducive to improving the uniformity of the current and the current density, reducing the risk of local overheating of the battery monomer, effectively improving the charging performance and the fast charging performance of the battery monomer, and at least part of the first electrical connecting piece and the second electrical connecting piece is located between the electrode assembly and the shell main body, which can limit the electrode assembly by the first electrical connecting piece and the second electrical connecting piece, reduce the risk of shaking of the electrode assembly in the shell, and improve the safety and service life of the battery monomer.

[0082] The battery device disclosed in the embodiments of the application can be used in an electric device such as a vehicle, a ship or an aircraft, but is not limited thereto. The power supply system of the electric device can be composed of the battery device disclosed in the application.

[0083] The following embodiments are described with reference to a vehicle 1000 as an example of an electric device of the embodiments of the application for convenience of description.

[0084] Please refer to Figure 1 , Figure 1A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0085] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0086] Please refer to Figure 2 , Figure 2 A structural exploded view of the battery device 100 is provided for some embodiments of the present application. The battery device 100 includes a box body 201 and a plurality of battery monomers 400, and the battery monomers 400 are used to be accommodated in the box body 201. Among them, the box body 201 is used to provide an assembly space for the battery monomers 400, and the box body 201 can adopt various structures. In some embodiments, the box body 201 can include a first box body 202 and a second box body 203, and the first box body 202 and the second box body 203 are mutually covered. The first box body 202 and the second box body 203 jointly define an assembly space for accommodating the battery monomers 400. The second box body 203 can be a hollow structure with one end open, and the first box body 202 can be a plate structure, which is covered on the open side of the second box body 203 to jointly define the assembly space with the second box body 203. The first box body 202 and the second box body 203 can also be hollow structures with one side open, and the open side of the first box body 202 is covered on the open side of the second box body 203. Of course, the box body 201 formed by the first box body 202 and the second box body 203 can have various shapes, such as a cylinder, a cuboid, etc.

[0087] The battery monomer 400 according to the embodiments of the present application is described below with reference to Figures 3-13

[0088] Please refer to Figures 3-13 ​As shown, according to the battery cell 400 of the embodiments of the present application, the battery cell 400 comprises: a shell 1, the shell 1 comprises a shell main body 11 and a cover 12, the shell main body 11 and the cover 12 are fixedly connected to jointly define a mounting cavity 13, the cover 12 is provided with a first pole 121 and a second pole 122; an electrode assembly 2, the electrode assembly 2 is arranged in the mounting cavity 13, the electrode assembly 2 and the cover 12 are arranged along a first direction, and the electrode assembly 2 is provided with a first tab 21 and a second tab 22 at an end portion of the electrode assembly 2 along a second direction, the first direction and the second direction are perpendicular; a first electrical connection 3, the first electrical connection 3 is arranged in the mounting cavity 13, at least part of the first electrical connection 3 is located between the end portion of the electrode assembly 2 provided with the first tab 21 and the shell main body 11, and the first electrical connection 3 is connected with the first pole 121 and the first tab 21; a second electrical connection 4, the second electrical connection 4 is arranged in the mounting cavity 13, and at least part of the second electrical connection 4 is located between the end portion of the electrode assembly 2 provided with the second tab 22 and the shell main body 11, and the second electrical connection 4 is connected with the second pole 122 and the second tab 22.

[0089] The shell 1 can be configured in the shape of a rectangular parallelepiped, a cylinder, etc., but is not limited thereto, so that the battery cell 400 can be applicable to different use scenarios, and the versatility of the battery cell 400 can be improved. As some embodiments of the present application, the shell main body 11 and the cover 12 can be welded. As some embodiments of the present application, the shell main body 11 and the cover 12 can be adhesively connected.

[0090] As some embodiments of the present application, the shell 1 can be configured of aluminum material. As some embodiments of the present application, the shell 1 can be configured of carbon fiber composite material. As some embodiments of the present application, the shell main body 11 can be configured in a ring structure, and the cover 12 can be provided in two, and the two covers 12 can be respectively assembled at the corresponding open ends of the shell main body 11, so that the shell main body 11 and the cover 12 jointly define the mounting cavity 13. As other embodiments of the present application, the shell main body 11 can be configured in a columnar structure with one end open, and the cover 12 can be provided in one, and the cover 12 can be assembled at the open end of the shell main body 11, so that the shell main body 11 and the cover 12 jointly define the mounting cavity 13. The mounting cavity 13 can provide an assembly position for the electrode assembly 2, and by arranging the electrode assembly 2 in the mounting cavity 13, the electrode assembly 2 can work safely in the shell 1, the risk of failure of the battery cell 400 caused by external environment interference on the electrode assembly 2 can be reduced, and the use reliability of the battery cell 400 can be improved.

[0091] The electrode assembly 2 and the cover 12 are arranged along a first direction, and the first direction is Figure 1The cover body 12 is provided with a first pole column 121 and a second pole column 122 in the X direction. When the cover body 12 is provided as one, the first pole column 121 and the second pole column 122 are arranged on the same cover body 12. When the cover body 12 is provided as two, the first pole column 121 and the second pole column 122 are arranged on the two cover bodies 12 respectively. As some embodiments of the present application, the first pole column 121 is configured as a positive pole column, and the second pole column 122 is configured as a negative pole column. The present application is described by taking the example that the first pole column 121 is configured as a positive pole column, the second pole column 122 is configured as a negative pole column, and the first pole column 121 and the second pole column 122 are arranged on the two cover bodies 12 respectively. In this way, the arrangement of the first pole column 121 and the second pole column 122 is reasonable. By arranging the first pole column 121 and the second pole column 122 on the two cover bodies 12 respectively, the risk of direct contact of the first pole column 121 and the second pole column 122 caused by damage of the cover body 12 can be reduced, thereby reducing the risk of short circuit inside the battery monomer 400, and being beneficial to further improve the safety and service life of the battery monomer 400.

[0092] In the second direction, that is, Figure 1 The electrode assembly 2 has opposite two ends in the Y direction. The end of the electrode assembly 2 is formed with a first pole lug 21 and a second pole lug 22. As some embodiments of the present application, the first pole lug 21 can be configured as an aluminum pole lug, and the second pole lug 22 can be configured as a copper pole lug. As some embodiments of the present application, the first pole lug 21 and the second pole lug 22 can be arranged on the same end of the electrode assembly 2. As some embodiments of the present application, the first pole lug 21 and the second pole lug 22 can be arranged on the two ends of the electrode assembly 2 respectively. As some embodiments of the present application, the first pole lug 21 and the second pole lug 22 are arranged on each end of the electrode assembly 2. The first direction and the second direction are perpendicular, that is, the X direction and the Y direction are perpendicular.

[0093] The first electric connecting piece 3 is arranged in the mounting cavity 13, and at least part of the first electric connecting piece 3 is located between the end of the electrode assembly 2 provided with the first pole lug 21 and the shell main body 11. For example, along the second direction, at least part of the first electric connecting piece 3 is arranged between the electrode assembly 2 and the shell main body 11. In this way, the first electric connecting piece 3 can limit the electrode assembly 2, thereby reducing the risk of movement of the electrode assembly 2 in the second direction in the mounting cavity 13, and reducing the risk of damage of the electrode assembly 2 during movement, which is beneficial to improve the use reliability of the electrode assembly 2, and further prolong the service life of the battery monomer 400.

[0094] The first electric connecting piece 3 is connected with the first pole post 121 and the first tab 21. As some embodiments of the present application, the first electric connecting piece 3 can be directly connected with the first pole post 121 and the first tab 21 through welding. As some embodiments of the present application, the first electric connecting piece 3 can be indirectly connected with the first pole post 121 and the first tab 21 through a wire. The first pole post 121 serves as a positive output terminal of the battery monomer 400 and can provide a positive charge input and output channel for the battery monomer 400. By connecting the first electric connecting piece 3 with the first pole post 121 and the first tab 21, the positive charge can flow into the electrode assembly 2 through the first pole post 121, the first electric connecting piece 3 and the first tab 21 in sequence during the battery charging process, thereby achieving the effect of charging the battery monomer 400. During the battery discharging process, the positive charge can flow to the external circuit through the first tab 21, the first electric connecting piece 3 and the first pole post 121 in sequence, thereby achieving the effect of discharging the battery monomer 400.

[0095] Further, the first electric connecting piece 3 generally has high conductivity and good heat dissipation performance. The first pole post 121 and the first tab 21 are connected through the first electric connecting piece 3, which can make the current flow smoothly between the first tab 21 and the first pole post 121, thereby reducing the energy loss of the battery monomer 400 and also helping to make the current density of the electrode assembly 2 more evenly distributed, thereby reducing the risk of local overheating of the battery monomer 400 and effectively improving the charging performance of the battery monomer 400, and further improving the fast charging performance of the battery monomer 400.

[0096] The second electric connecting piece 4 is arranged in the mounting cavity 13, and at least part of the second electric connecting piece 4 is located between the end of the electrode assembly 2 provided with the second tab 22 and the shell main body 11, for example, along the second direction, at least part of the second electric connecting piece 4 is arranged between the electrode assembly 2 and the shell main body 11. Such arrangement can further limit the electrode assembly 2 by the second electric connecting piece 4, thereby reducing the risk of movement of the electrode assembly 2 in the second direction in the mounting cavity 13, further reducing the risk of damage to the electrode assembly 2 during movement, and helping to improve the use reliability of the electrode assembly 2, thereby further prolonging the service life of the battery monomer 400.

[0097] The second electrical connector 4 is connected to both the second terminal 122 and the second tab 22. In some embodiments of this application, the second electrical connector 4 can be directly connected to the second terminal 122 and the second tab 22 via welding. In some embodiments of this application, the second electrical connector 4 can also be indirectly connected to the second terminal 122 and the second tab 22 via wires. The second terminal 122 serves as the negative output terminal of the battery cell 400, providing a negative charge input and output channel for the battery cell 400. By connecting the second electrical connector 4 to both the second terminal 122 and the second tab 22, during battery charging, negative charges can flow sequentially through the second terminal 122, the second electrical connector 4, and the second tab 22 into the electrode assembly 2, thereby achieving the effect of charging the battery cell 400. During battery discharging, negative charges can flow sequentially through the second tab 22, the second electrical connector 4, and the second terminal 122 to the external circuit, thereby achieving the effect of discharging the battery cell 400.

[0098] Furthermore, the second electrical connector 4 typically has high conductivity and good heat dissipation performance. The second terminal 122 and the second tab 22 are connected through the second electrical connector 4, which allows the current to flow smoothly between the second tab 22 and the second terminal 122. This helps to reduce the energy loss of the battery cell 400 and also helps to make the current density of the electrode assembly 2 more uniformly distributed, thereby reducing the risk of local overheating of the battery cell 400, effectively improving the charging performance of the battery cell 400, and thus improving the fast charging performance of the battery cell 400.

[0099] In some embodiments, such as Figures 4-7 As shown, the electrode assembly 2 is formed by winding, and the electrode assembly 2 has four first tabs 21 and four second tabs 22. Along the second direction, two first tabs 21 and two second tabs 22 are formed at one end of the electrode assembly 2, and two first tabs 21 and two second tabs 22 are formed at the other end of the electrode assembly 2. Along the second direction, the two first tabs 21 at one end of the electrode assembly 2 and the two first tabs 21 at the other end of the electrode assembly 2 can be arranged in a one-to-one correspondence, and the two second tabs 22 at one end of the electrode assembly 2 and the two second tabs 22 at the other end of the electrode assembly 2 can be arranged in a one-to-one correspondence. A portion of the first electrical connector 3 is welded to the first tab 21, and a portion of the second electrical connector 4 is welded to the second tab 22. The assembled electrode assembly 2, the first electrical connector 3, and the second electrical connector 4 are then assembled onto the shell body 11. Two covers 12 are then placed over the two open ends of the shell body 11, so that the first electrical connector 3 is connected to the first terminal post 121 on the corresponding cover 12, and the second electrical connector 4 is connected to the second terminal post 122 on the corresponding cover 12, thereby completing the assembly of the battery cell 400.

[0100] It should be noted that an insulating film 5 can be arranged between the electrode assembly 2 and the shell body 11, and a PET sheet 6 (Polyethylene Terephthalate) can be arranged between the electrode assembly 2 and the first electrical connector 3 and between the electrode assembly 2 and the second electrical connector 4, and a plastic part 7 can be arranged between the first electrical connector 3 and the cover 12, between the second electrical connector 4 and the cover 12, between the first pole 121 and the cover 12, and between the second pole 122 and the cover 12. Such arrangement can make the arrangement of the battery monomer 400 reasonable, reduce the risk of internal short circuit of the battery monomer 400, thereby improving the use reliability and safety of the battery monomer 400, and effectively prolonging the service life of the battery monomer 400.

[0101] In the above technical solution, the end of the electrode assembly 2 is provided with the first tab 21 and the second tab 22 along the second direction, which can make the flow path of the current in the battery monomer 400 reasonable, which is conducive to improving the uniformity of the current and the current density, reducing the risk of local overheating of the battery monomer 400, effectively improving the charging performance and fast charging performance of the battery monomer 400, and at least part of the first electrical connector 3 and the second electrical connector 4 is located between the electrode assembly 2 and the shell body 11, which can limit the electrode assembly 2 by the first electrical connector 3 and the second electrical connector 4, reducing the risk of electrode assembly 2 shaking in the shell 1, thereby improving the use safety and service life of the battery monomer 400.

[0102] According to some embodiments of the present application, referring to Figures 6-7 The first electrical connector 3 can include a first limiting wall 31. At least one end of the electrode assembly 2 is provided with a first tab 21 along the second direction. The first limiting wall 31 is arranged between the end of the electrode assembly 2 provided with the first tab 21 and the shell body 11, and the first limiting wall 31 is connected with the corresponding first tab 21.

[0103] At least one end of the electrode assembly 2 is provided with a first tab 21 along the second direction, for example, one end of the electrode assembly 2 is provided with a first tab 21 along the second direction, or both ends of the electrode assembly 2 are provided with a first tab 21. The present application takes both ends of the electrode assembly 2 provided with a first tab 21 as an example for description. By providing a first tab 21 at both ends of the electrode assembly 2, the current can be shunted, which is conducive to improving the transmission efficiency of the current and reducing the current density of a single first tab 21, thereby realizing the effect of uniform distribution of the current inside the battery monomer 400, reducing the risk of local overheating or performance degradation of the battery monomer 400 caused by the concentration of the current, and further improving the fast charging performance of the battery monomer 400.

[0104] When one end of the electrode assembly 2 is provided with the first tab 21, the first limiting wall 31 is arranged between the end of the electrode assembly 2 provided with the first tab 21 and the shell body 11. When both ends of the electrode assembly 2 are provided with the first tab 21, the first limiting wall 31 is arranged between both ends of the electrode assembly 2 and the shell body 11, and in this case, the first limiting wall 31 can be two. The first limiting wall 31 is connected with the first tab 21 on the corresponding side, for example, the first limiting wall 31 can be welded with the first tab 21 on the corresponding side, or the first limiting wall 31 can be clamped with the first tab 21 on the corresponding side. The application is described by taking the example of the first limiting wall 31 welded with the first tab 21 on the corresponding side. The welding connection can improve the connection reliability of the first limiting wall 31 and the corresponding first tab 21, reduce the risk of poor contact between the first limiting wall 31 and the corresponding first tab 21, and thus improve the use reliability of the battery monomer 400.

[0105] As an example, both ends of the electrode assembly 2 are provided with the first tab 21, and the first limiting wall 31 is two. The two first limiting walls 31 are respectively located at the two ends of the electrode assembly 2 along the second direction, and the two first limiting walls 31 can play a role in clamping the electrode assembly 2, thereby improving the positional stability of the electrode assembly 2.

[0106] By arranging the first limiting wall 31 between the end of the electrode assembly 2 provided with the first tab 21 and the shell body 11, the position of the first limiting wall 31 can be reasonably set, which is conducive to limiting the electrode assembly 2 by the first limiting wall 31, reduces the risk of the electrode assembly 2 moving along the second direction, thereby reducing the risk of the electrode assembly 2 moving and causing the insulating film 5 to be worn out, and is conducive to reducing the risk of the electrode assembly 2 and the shell body 11 directly contacting to cause internal short circuit of the battery monomer 400, and thus improving the use safety and service life of the battery monomer 400.

[0107] In the above technical solution, by arranging the first limiting wall 31 between the end of the electrode assembly 2 provided with the first tab 21 and the shell body 11, and connecting the first limiting wall 31 with the corresponding first tab 21, the position of the first limiting wall 31 can be reasonably set, which is conducive to limiting the electrode assembly 2 by the first limiting wall 31, reduces the risk of the electrode assembly 2 moving along the second direction, thereby reducing the risk of the electrode assembly 2 moving and causing the insulating film 5 to be worn out, and is conducive to reducing the risk of the electrode assembly 2 and the shell body 11 directly contacting to cause internal short circuit of the battery monomer 400, and thus improving the use safety and service life of the battery monomer 400.

[0108] According to some embodiments of the application, referring to FIGS. 1-4, the end of the electrode assembly 2 provided with the first tab 21 is provided with a plurality of first tabs 21. Figure 7 Figure 10 According to some embodiments of the application, referring to FIGS. 1-4, the end of the electrode assembly 2 provided with the first tab 21 is provided with a plurality of first tabs 21.

[0109] ​The electrode assembly 2 has multiple first tabs 21 at its end, such as two, three, or more. This application uses two first tabs 21 at the end of the electrode assembly 2 as an example. This arrangement allows for a reasonable number of first tabs 21. By having two first tabs 21 at the end of the electrode assembly 2, the number of current channels inside the electrode assembly 2 can be increased, resulting in a more uniform current distribution within the battery cell 400. This effectively reduces local current density, which helps reduce safety risks such as localized overheating of the battery cell 400, thereby improving the charging and discharging capabilities of the battery cell 400 and enhancing its fast-charging performance. It also reduces the risk of increased production costs due to an excessive number of first tabs 21.

[0110] Furthermore, by setting two first tabs 21, the reliability of the electrode assembly 2 can be improved. When one of the first tabs 21 fails due to aging, the other first tab 21 can continue to conduct electricity, so that the current of the electrode assembly 2 can be transmitted to the first electrical connector 3 through the first tab 21, and then led to the external circuit through the first terminal 121. This helps to improve the reliability of the battery cell 400 and effectively extend the service life of the battery cell 400.

[0111] In the above technical solution, by providing multiple first tabs 21 at the end of the electrode assembly 2 where the first tab 21 is located, the current channels inside the electrode assembly 2 can be increased, thereby making the current more evenly distributed inside the battery cell 400, effectively reducing the local current density, which helps to reduce safety risks such as local overheating of the battery cell 400, and thus improves the charging and discharging capacity of the battery cell 400, and enhances the fast charging performance of the battery cell 400. It can also improve the reliability of the electrode assembly 2. When one of the first tabs 21 fails due to aging, the other first tab 21 can continue to play a conductive role, so that the current of the electrode assembly 2 can be transferred to the first electrical connector 3 through the first tab 21, and then led to the external circuit through the first terminal 121, thereby improving the reliability of the battery cell 400 and effectively extending the service life of the battery cell 400.

[0112] According to some embodiments of this application, refer to Figure 7 As shown, at least a portion of the first tabs 21 located at the same end of the electrode assembly 2 are arranged along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; and / or at least a portion of the first tabs 21 located at the same end of the electrode assembly 2 are arranged along a first direction.

[0113] As some embodiments of the present application, at least part of the plurality of first tabs 21 at the same end of the electrode assembly 2 are arranged in the third direction. As some embodiments of the present application, at least part of the plurality of first tabs 21 at the same end of the electrode assembly 2 are arranged in the first direction. As some embodiments of the present application, at least part of the plurality of first tabs 21 at the same end of the electrode assembly 2 are arranged in the third direction, and at least part of the plurality of first tabs 21 at the same end of the electrode assembly 2 are arranged in the first direction. The third direction is the Z direction in the X direction, Y direction and Z direction, and the first direction, the second direction and the third direction are perpendicular to each other, that is, the X direction, the Y direction and the Z direction are perpendicular to each other. Figure 1 As some embodiments of the present application, at least part of the plurality of first tabs 21 at the same end of the electrode assembly 2 are arranged in the third direction. As some embodiments of the present application, at least part of the plurality of first tabs 21 at the same end of the electrode assembly 2 are arranged in the first direction. As some embodiments of the present application, at least part of the plurality of first tabs 21 at the same end of the electrode assembly 2 are arranged in the third direction, and at least part of the plurality of first tabs 21 at the same end of the electrode assembly 2 are arranged in the first direction. The third direction is the Z direction in the X direction, Y direction and Z direction, and the first direction, the second direction and the third direction are perpendicular to each other, that is, the X direction, the Y direction and the Z direction are perpendicular to each other.

[0114] As shown in FIG. 1, the two first tabs 21 at the same end of the electrode assembly 2 are arranged in the third direction, which can reasonably set the number and position of the first tabs 21. By arranging two first tabs 21 at the end of the electrode assembly 2 in the third direction, the uniformity of the arrangement of the first tabs 21 at the end of the electrode assembly 2 can be improved, which is conducive to the uniform transmission of current through the plurality of first tabs 21, so that the current is more evenly distributed inside the battery monomer 400, effectively reducing the local current density, which is conducive to reducing the safety risks such as local overheating of the battery monomer 400, and further improving the charging and discharging capacity of the battery monomer 400 and the fast charging performance of the battery monomer 400. Figure 7 As shown in FIG. 1, the two first tabs 21 at the same end of the electrode assembly 2 are arranged in the third direction, which can reasonably set the number and position of the first tabs 21. By arranging two first tabs 21 at the end of the electrode assembly 2 in the third direction, the uniformity of the arrangement of the first tabs 21 at the end of the electrode assembly 2 can be improved, which is conducive to the uniform transmission of current through the plurality of first tabs 21, so that the current is more evenly distributed inside the battery monomer 400, effectively reducing the local current density, which is conducive to reducing the safety risks such as local overheating of the battery monomer 400, and further improving the charging and discharging capacity of the battery monomer 400 and the fast charging performance of the battery monomer 400.

[0115] As shown in FIG. 1, the two first tabs 21 at the same end of the electrode assembly 2 are arranged in the third direction, which can reasonably set the number and position of the first tabs 21. By arranging two first tabs 21 at the end of the electrode assembly 2 in the third direction, the uniformity of the arrangement of the first tabs 21 at the end of the electrode assembly 2 can be improved, which is conducive to the uniform transmission of current through the plurality of first tabs 21, so that the current is more evenly distributed inside the battery monomer 400, effectively reducing the local current density, which is conducive to reducing the safety risks such as local overheating of the battery monomer 400, and further improving the charging and discharging capacity of the battery monomer 400 and the fast charging performance of the battery monomer 400. Figure 10 Figure 11 As shown in FIG. 1, the two first tabs 21 at the same end of the electrode assembly 2 are arranged in the third direction, which can reasonably set the number and position of the first tabs 21. By arranging two first tabs 21 at the end of the electrode assembly 2 in the third direction, the uniformity of the arrangement of the first tabs 21 at the end of the electrode assembly 2 can be improved, which is conducive to the uniform transmission of current through the plurality of first tabs 21, so that the current is more evenly distributed inside the battery monomer 400, effectively reducing the local current density, which is conducive to reducing the safety risks such as local overheating of the battery monomer 400, and further improving the charging and discharging capacity of the battery monomer 400 and the fast charging performance of the battery monomer 400.

[0116] ​In the technical solution, by arranging at least part of the plurality of first tabs 21 at the same end of the electrode assembly 2 in the third direction and arranging at least part of the plurality of first tabs 21 at the same end of the electrode assembly 2 in the first direction, the end of the electrode assembly 2 is arranged with a plurality of first tabs 21 in the first direction and the third direction, which can improve the uniformity of the arrangement of the first tabs 21 at the end of the electrode assembly 2, and facilitate uniform current transmission through the plurality of first tabs 21, so that the current is more uniformly distributed inside the battery monomer 400, effectively reducing the local current density, reducing the risk of local overheating of the battery monomer 400, and improving the charging and discharging capacity of the battery monomer 400, and improving the fast charging performance of the battery monomer 400.

[0117] According to some embodiments of the present application, referring to Figure 4 , Figure 6 and Figure 7 , the edge of the first limiting wall 31 forms a first connecting portion 311, and the first connecting portion 311 is connected with the corresponding first tab 21.

[0118] In some embodiments, the edge of the first limiting wall 31 forms a first connecting portion 311 in the third direction. As some embodiments of the present application, the first connecting portion 311 and the first limiting wall 31 can be integrally formed, that is, the first connecting portion 311 and the first limiting wall 31 are configured as an integrally formed piece, which has good structural strength. By integrally forming the first connecting portion 311 and the first limiting wall 31, the connection reliability of the first connecting portion 311 and the first limiting wall 31 can be improved, and the probability of fracture at the connection between the first connecting portion 311 and the first limiting wall 31 can be reduced, thereby improving the use reliability of the battery monomer 400. As some embodiments of the present application, the first connecting portion 311 and the first limiting wall 31 can be welded.

[0119] The number of the first connecting portions 311 can be set to at least one, for example, the first connecting portions 311 can be set to one, two, four or more, the number of the first connecting portions 311 can be matched with the number of the first tabs 21, so that any first tab 21 has a corresponding first connecting portion 311 connected thereto. By connecting the first connecting portion 311 with the corresponding first tab 21, for example, the first connecting portion 311 is welded with the corresponding first tab 21, or the first connecting portion 311 is connected with the corresponding first tab 21 by clamping, the first connecting portion 311 is connected with the corresponding first tab 21, which is conducive to improving the assembly efficiency, and the first tab 21 and the first electric connecting piece 3 can also be connected through the first connecting portion 311, so as to realize the effect that the first tab 21 and the first pole 121 are connected through the first electric connecting piece 3, which is conducive to the effect that the electrode assembly 2 can be discharged in turn through the first tab 21, the first electric connecting piece 3 and the first pole 121, or the current can be charged to the electrode assembly 2 in turn through the first pole 121, the first electric connecting piece 3 and the first tab 21, thereby realizing the effect that the battery monomer 400 can be charged or discharged as needed.

[0120] Further, since the first electric connecting piece 3 usually has high conductivity and good heat dissipation performance, the first pole 121 and the first tab 21 are connected through the first electric connecting piece 3, which can make the current flow smoothly between the first tab 21 and the first pole 121, which is conducive to reducing the energy loss of the battery monomer 400, and also conducive to making the current density of the electrode assembly 2 more uniformly distributed, thereby reducing the risk of local overheating of the battery monomer 400, effectively improving the charging performance of the battery monomer 400, and further improving the fast charging performance of the battery monomer 400.

[0121] As an embodiment, Figure 11 As shown, along the third direction, the side edge of the first limiting wall 31 is formed with the first connecting portion 311, and the number of the first connecting portion 311 can be set to one, two or more. As another embodiment, along the first direction, the side edge of the first limiting wall 31 away from the first connecting wall 32 is formed with the first connecting portion 311, and the number of the first connecting portion 311 can be set to one, two or more. By forming the first connecting portion 311 on the edge of the first limiting wall 31, the number and position of the first connecting portion 311 can be set flexibly, and the number and position of the first connecting portion 311 can be set according to the number and position of the first tab 21, thereby improving the versatility of the first electric connecting piece 3.

[0122] In the above technical solution, a first connecting part 311 is formed on the edge of the first limiting wall 31. The first connecting part 311 is connected to the corresponding first electrode tab 21, which facilitates the connection between the first connecting part 311 and the corresponding first electrode tab 21, and helps to improve assembly efficiency. The first electrode tab 21 and the first electrical connector 3 can be connected through the first connecting part 311, thereby achieving the effect of connecting the first electrode tab 21 and the first electrode post 121 through the first electrical connector 3. This is beneficial for the electrode assembly 2 to discharge sequentially through the first electrode tab 21, the first electrical connector 3 and the first electrode post 121, or for the current to charge the electrode assembly 2 sequentially through the first electrode post 121, the first electrical connector 3 and the first electrode tab 21, thereby enabling the battery cell 400 to be charged or discharged as needed.

[0123] Furthermore, since the first electrical connector 3 typically has high conductivity and good heat dissipation performance, the first terminal 121 and the first tab 21 are connected through the first electrical connector 3, which allows the current to flow smoothly between the first tab 21 and the first terminal 121. This helps to reduce the energy loss of the battery cell 400 and also helps to make the current density of the electrode assembly 2 more uniformly distributed, thereby reducing the risk of local overheating of the battery cell 400, effectively improving the charging performance of the battery cell 400, and thus improving the fast charging performance of the battery cell 400.

[0124] According to some embodiments of this application, refer to Figures 6-7 As shown, the first electrical connector 3 may further include: a first connecting wall 32, which is located between the cover 12 and the electrode assembly 2, and is connected to the first limiting wall 31 and the first pole post 121.

[0125] Along the first direction, the first connecting wall 32 is located between the cover 12 and the electrode assembly 2. The first connecting wall 32 can limit the electrode assembly 2, reduce the risk of the electrode assembly 2 moving along the first direction, thereby improving the stability of the electrode assembly 2, reducing the risk of the insulating film 5 being worn through due to the movement of the electrode assembly 2, and helping to reduce the risk of the battery cell 400 being short-circuited due to direct contact between the electrode assembly 2 and the shell body 11, thereby improving the safety and service life of the battery cell 400.

[0126] The first connecting wall 32 is connected with the first limiting wall 31 and the first pole column 121. As some embodiments of the present application, the first connecting wall 32 can be directly connected with the first limiting wall 31 and the first pole column 121 through welding. By connecting the first connecting wall 32 with the first limiting wall 31 and the first pole column 121, the first tab 21 can be connected with the first pole column 121 through the first electric connecting piece 3, which is conducive to discharging the electrode assembly 2 through the first tab 21, the first electric connecting piece 3 and the first pole column 121 in turn, or charging the electrode assembly 2 through the first pole column 121, the first electric connecting piece 3 and the first tab 21 in turn, thereby realizing the effect that the battery monomer 400 can be charged or discharged as needed.

[0127] It should be noted that when the electrode assembly 2 is provided with the first tab 21 at both ends in the second direction, the first connecting wall 32 is provided with the first limiting wall 31 at both ends in the second direction, so that the first tab 21 at both ends of the electrode assembly 2 can be connected with the first electric connecting piece 3. When the electrode assembly 2 is provided with the first tab 21 at one end in the second direction, the first connecting wall 32 is provided with the first limiting wall 31 at one end in the second direction, and the first limiting wall 31 is arranged between the end of the electrode assembly 2 provided with the first tab 21 and the shell main body 11, so as to reduce the production cost of the first electric connecting piece 3.

[0128] In the above technical solution, by arranging the first connecting wall 32 between the cover body 12 and the electrode assembly 2, and connecting the first connecting wall 32 with the first limiting wall 31 and the first pole column 121, the risk of the electrode assembly 2 moving in the first direction can be reduced, thereby improving the stability of the electrode assembly 2, reducing the risk of the electrode assembly 2 moving and causing the insulating film 5 to be damaged, and being conducive to reducing the risk of the electrode assembly 2 and the shell main body 11 directly contacting to cause internal short circuit of the battery monomer 400, thereby improving the use safety and service life of the battery monomer 400. The first tab 21 can also be connected with the first pole column 121 through the first electric connecting piece 3, which is conducive to discharging the electrode assembly 2 through the first tab 21, the first electric connecting piece 3 and the first pole column 121 in turn, or charging the electrode assembly 2 through the first pole column 121, the first electric connecting piece 3 and the first tab 21 in turn, thereby realizing the effect that the battery monomer 400 can be charged or discharged as needed.

[0129] According to some embodiments of the present application, referring to FIGS. 1-3, Figure 9 and Figure 13 As shown in FIGS. 1-3, an end surface of the first connecting wall 32 facing the first pole column 121 is formed with a connecting boss 321, and the connecting boss 321 is connected with the first pole column 121.

[0130] The first connecting wall 32 has a connecting boss 321. In some embodiments of this application, the connecting boss 321 can be constructed as a cylindrical boss. In some embodiments of this application, the connecting boss 321 can be constructed as a prism-shaped boss. Along the first direction, the first connecting wall 32 can have two opposing sides. The connecting boss 321 is formed on the side of the first connecting wall 32 facing the first electrode post 121. This arrangement allows for a reasonable positioning of the connecting boss 321, facilitating its connection with the first electrode post 121. In some embodiments of this application, the connecting boss 321 and the first electrode post 121 can be welded together. In some embodiments of this application, the connecting boss 321 and the first electrode post 121 can be snap-fitted together. By providing a connecting boss 321 facing the first electrode post 121 on the first connecting wall 32, the first connecting wall 32 and the first electrode post 121 can be connected via the connecting boss 321, reducing the difficulty of connecting the first connecting wall 32 and the first electrode post 121, thereby improving the assembly efficiency of the battery cell 400.

[0131] As some embodiments of this application, the plastic part 7 can be provided with a clearance hole 71. The size and shape of the clearance hole 71 on the plastic part 7 between the first connecting wall 32 and the cover 12 are adapted to the size and shape of the connecting boss 321. When the connecting boss 321 is connected to the first pole post 121, the connecting boss 321 can pass through the plastic part 7 between the first connecting wall 32 and the cover 12, so that the connecting boss 321 and the first pole post 121 can be smoothly connected.

[0132] In the above technical solution, by forming a connecting boss 321 on the end face of the first connecting wall 32 facing the first pole post 121, and connecting the connecting boss 321 to the first pole post 121, the position of the connecting boss 321 can be reasonably set, which facilitates the connection between the connecting boss 321 and the first pole post 121 through the connecting boss 321, reduces the connection difficulty between the first connecting wall 32 and the first pole post 121, and thus improves the assembly efficiency of the battery cell 400.

[0133] According to some embodiments of this application, refer to Figure 3 and Figure 4 As shown, the cover 12 may include: a first cover 123 and a second cover 124, the first cover 123 and the second cover 124 being opposite to each other and spaced apart along a first direction, the shell body 11 being connected between the first cover 123 and the second cover 124, the first cover 123 being provided with a first electrode post 121, the second cover 124 being provided with a second electrode post 122, a portion of the first electrical connector 3 being located between the first cover 123 and the electrode assembly 2, and a portion of the second electrical connector 4 being located between the second cover 124 and the electrode assembly 2.

[0134] The first cover body 123 and the second cover body 124 are oppositely arranged and spaced apart along the first direction, the shell body 11 is annular, and the shell body 11 is connected between the first cover body 123 and the second cover body 124, that is, the first cover body 123 and the second cover body 124 are arranged at two ends of the shell body 11 along the first direction, so that the first cover body 123, the second cover body 124 and the shell body 11 jointly define the mounting cavity 13. The first cover body 123 is provided with the first pole column 121, the second cover body 124 is provided with the second pole column 122, part of the first electric connecting piece 3 is located between the first cover body 123 and the electrode assembly 2, for example, the first connecting wall 32 of the first electric connecting piece 3 is located between the first cover body 123 and the electrode assembly 2, so as to facilitate the connection between the first connecting wall 32 of the first electric connecting piece 3 and the first pole column 121. Part of the second electric connecting piece 4 is located between the second cover body 124 and the electrode assembly 2, so as to facilitate the connection between the second electric connecting piece 4 and the second pole column 122.

[0135] By arranging the first pole column 121 on the first cover body 123 and connecting the first pole column 121 with the corresponding first tab 21 through the first electric connecting piece 3, and arranging the second pole column 122 on the second cover body 124 and connecting the second pole column 122 with the corresponding second tab 22 through the second electric connecting piece 4, the battery monomer 400 can be assembled, and arranging the first pole column 121 and the second pole column 122 on different cover bodies 12 respectively can optimize the space arrangement of the battery monomer 400, realize the electrical isolation effect of the first pole column 121 and the second pole column 122, reduce the electrical interference and short circuit risk inside the battery monomer 400, and thus improve the safety and reliability of the battery monomer 400. In addition, during the charging and discharging process of the battery monomer 400, the current flows into or out of the battery through the first pole column 121 and the second pole column 122, and distributing the first pole column 121 and the second pole column 122 on different cover bodies 12 can more effectively distribute the current and reduce the problem of excessive local current density of the battery monomer 400, thereby reducing the risk of heat accumulation and temperature rise inside the battery and effectively improving the charging performance of the battery monomer 400, and thus improving the fast charging performance of the battery monomer 400.

[0136] In the technical scheme, the first cover body 123 is provided with the first pole 121, the second cover body 124 is provided with the second pole 122, part of the first electric connecting piece 3 is located between the first cover body 123 and the electrode assembly 2, and part of the second electric connecting piece 4 is located between the second cover body 124 and the electrode assembly 2, so that the first connecting wall 32 of the first electric connecting piece 3 is connected with the first pole 121, the second electric connecting piece 4 is connected with the second pole 122, the first pole 121 and the second pole 122 are arranged on different cover bodies 12, the space arrangement of the battery monomer 400 is optimized, the first pole 121 and the second pole 122 are electrically isolated, the electrical interference and short circuit risk in the battery monomer 400 are reduced, and the safety and reliability of the battery monomer 400 are improved. In addition, in the charging and discharging process of the battery monomer 400, the current flows into or out of the battery monomer 400 through the first pole 121 and the second pole 122, and the first pole 121 and the second pole 122 are distributed on different cover bodies 12, so that the current can be distributed more effectively, the problem of excessive local current density of the battery monomer 400 is reduced, the risk of heat accumulation and temperature rise in the battery monomer 400 is reduced, the charging performance of the battery monomer 400 is effectively improved, and the fast charging performance of the battery monomer 400 is improved.

[0137] According to some embodiments of the present application, referring to Figure 1 , Figure 3 and Figure 10 , along the second direction, the shell body 11 has a mounting wall 111 provided with an anti-explosion structure 112 and / or a liquid injection hole 113.

[0138] In the second direction, the shell body 11 can have at least one installation wall 111, for example, in the second direction, the shell body 11 has two opposite sides, one side wall of the shell body 11 is configured as the installation wall 111, or the other side wall of the shell body 11 is configured as the installation wall 111, or both side walls of the shell body 11 are configured as the installation wall 111. The installation wall 111 is provided with an explosion-proof structure 112 and / or a liquid injection hole 113. As an embodiment of the present application, the installation wall 111 is provided with the explosion-proof structure 112. As an embodiment of the present application, the installation wall 111 is provided with the liquid injection hole 113. As an embodiment of the present application, the installation wall 111 is provided with the explosion-proof structure 112 and the liquid injection hole 113. The present application takes the installation wall 111 provided with the explosion-proof structure 112 and the liquid injection hole 113 as an example for description, that is, the explosion-proof structure 112 and the liquid injection hole 113 are arranged on the same installation wall 111. The explosion-proof structure 112 can be configured as an explosion-proof valve. During the charging and discharging process of the battery monomer 400, due to the electrochemical reaction inside the battery monomer 400, gas will be generated, which will cause the internal pressure of the battery monomer 400 to gradually rise. When the internal pressure of the battery monomer 400 exceeds a certain limit, the explosion-proof structure 112 will automatically open to release high-pressure gas, thereby reducing the risk of explosion of the battery monomer 400 due to excessive internal pressure. Further, the design of the explosion-proof structure 112 can also effectively prevent the battery monomer 400 from leaking liquid, thereby reducing the risk of damage to the battery monomer 400 and the user caused by the leakage of electrolyte, and is beneficial to improve the use safety of the battery monomer 400.

[0139] During the production or maintenance of the battery monomer 400, it is necessary to inject electrolyte into the battery monomer 400. By arranging the liquid injection hole 113, the difficulty of injecting liquid into the battery monomer 400 can be reduced, thereby improving the production efficiency or maintenance efficiency of the battery monomer 400, and faster infiltration rate can also be achieved.

[0140] In the above technical solution, by arranging the explosion-proof structure 112 on the installation wall 111, the position of the explosion-proof structure 112 can be reasonably arranged. Since the gap between the electrode assembly 2 and the shell body 11 is small, the gap between the electrode assembly 2 and the cover body 12 is greater than or slightly greater than the gap between the electrode assembly 2 and the shell body 11. Compared with arranging the explosion-proof structure 112 on the cover body 12, by arranging the explosion-proof structure 112 on the installation wall 111, it is convenient for the gas generated by the electrode assembly 2 to flow through the gap between the electrode assembly 2 and the cover body 12, which is beneficial to reduce the difficulty of gas flow, thereby improving the exhaust efficiency of the battery monomer 400, reducing the risk of accumulation of high-pressure gas in the battery monomer 400, and further reducing the risk of explosion of the battery monomer 400.

[0141] When the internal pressure of the battery monomer 400 exceeds a certain limit, the explosion-proof structure 112 will automatically open to release high-pressure gas, thereby reducing the risk of explosion of the battery monomer 400 due to excessive internal pressure. Further, the design of the explosion-proof structure 112 can also effectively prevent the battery monomer 400 from leaking liquid, thereby reducing the risk of damage to the battery monomer 400 and the user caused by the leakage of electrolyte, and improving the use safety of the battery monomer 400. By providing the liquid injection hole 113 on the mounting wall 111, the difficulty of liquid injection of the battery monomer 400 can be reduced, thereby improving the production efficiency or maintenance efficiency of the battery monomer 400, and faster infiltration rate can also be achieved.

[0142] According to some embodiments of the present application, referring to Figure 13 As shown in the figure, the second electrical connection 4 can include a second limiting wall 41. At least one end of the electrode assembly 2 is provided with a second tab 22 in the second direction. The second limiting wall 41 is arranged between the end of the electrode assembly 2 provided with the second tab 22 and the shell body 11. The second limiting wall 41 is connected with the corresponding second tab 22.

[0143] Wherein, at least one end of the electrode assembly 2 is provided with a second tab 22 in the second direction, for example, one end of the electrode assembly 2 is provided with a second tab 22 in the second direction, or both ends of the electrode assembly 2 are provided with a second tab 22. The present application takes both ends of the electrode assembly 2 provided with a second tab 22 as an example for illustration. By providing a second tab 22 at both ends of the electrode assembly 2, the current can be shunted, which is conducive to improving the transmission efficiency of the current and reducing the current density of a single second tab 22, thereby achieving the effect of uniform distribution of internal current of the battery monomer 400, reducing the risk of local overheating or performance degradation of the battery monomer 400 caused by current concentration, and further improving the fast charging performance of the battery monomer 400.

[0144] When one end of the electrode assembly 2 is provided with a second tab 22, a second limiting wall 41 is arranged between the end of the electrode assembly 2 provided with the second tab 22 and the shell body 11. When both ends of the electrode assembly 2 are provided with a second tab 22, a second limiting wall 41 is arranged between both ends of the electrode assembly 2 and the shell body 11. At this time, the second limiting wall 41 can be two. The second limiting wall 41 is connected with the corresponding second tab 22, for example, the second limiting wall 41 can be connected with the corresponding second tab 22 by welding, or the second limiting wall 41 can be connected with the corresponding second tab 22 by clamping. The present application takes the second limiting wall 41 connected with the corresponding second tab 22 by welding as an example for illustration. The welding connection can improve the connection reliability of the second limiting wall 41 and the corresponding second tab 22, reduce the risk of poor contact between the second limiting wall 41 and the corresponding second tab 22, and thereby improve the use reliability of the battery monomer 400.

[0145] As an example, the two ends of the electrode assembly 2 are provided with the second tabs 22, and the second limiting walls 41 are two, which are respectively located at the two ends of the electrode assembly 2 along the second direction. The two second limiting walls 41 can clamp the electrode assembly 2, thereby improving the positional stability of the electrode assembly 2.

[0146] By arranging the second limiting walls 41 between the end of the electrode assembly 2 provided with the second tabs 22 and the shell body 11, the positions of the second limiting walls 41 can be reasonably arranged, which is conducive to limiting the electrode assembly 2 by the second limiting walls 41, reduces the risk of the electrode assembly 2 moving along the second direction, thereby reducing the risk of the electrode assembly 2 moving to cause the insulating film 5 to be worn out, and is conducive to reducing the risk of the electrode assembly 2 directly contacting the shell body 11 to cause internal short circuit of the battery monomer 400, thereby improving the use safety and service life of the battery monomer 400.

[0147] In the above technical solution, by arranging the second limiting walls 41 between the end of the electrode assembly 2 provided with the second tabs 22 and the shell body 11, and connecting the second limiting walls 41 with the corresponding second tabs 22, the positions of the second limiting walls 41 can be reasonably arranged, which is conducive to limiting the electrode assembly 2 by the second limiting walls 41, reduces the risk of the electrode assembly 2 moving along the second direction, thereby reducing the risk of the electrode assembly 2 moving to cause the insulating film 5 to be worn out, and is conducive to reducing the risk of the electrode assembly 2 directly contacting the shell body 11 to cause internal short circuit of the battery monomer 400, thereby improving the use safety and service life of the battery monomer 400.

[0148] According to some embodiments of the present application, as shown in Figure 2 , Figure 5 and Figure 11 , the structure of the second electrical connection 4 is the same as that of the first electrical connection 3.

[0149] The structure of the second electrical connection 4 is the same as that of the first electrical connection 3, which can reasonably arrange the structure of the second electrical connection 4, and the second electrical connection 4 and the first electrical connection 3 can be machined by the same mold, thereby reducing the number of molds in the production process of the battery monomer 400, and reducing the production cost of the battery monomer 400. Further, the structure of the second electrical connection 4 is the same as that of the first electrical connection 3, without distinguishing the structures of the first electrical connection 3 and the second electrical connection 4, the first electrical connection 3 or the second electrical connection 4 can be connected between the first tab 21 and the first pole 121 and between the second tab 22 and the second pole 122, which is conducive to reducing the risk of reverse installation of the first electrical connection 3 and the second electrical connection 4, thereby reducing the assembly difficulty of the battery monomer 400, and improving the production efficiency of the battery monomer 400.

[0150] In the above technical solution, the structure of the second electrical connecting piece 4 is the same as that of the first electrical connecting piece 3, so that the structure of the second electrical connecting piece 4 is reasonable, and the second electrical connecting piece 4 and the first electrical connecting piece 3 can be machined by the same mold, thereby reducing the number of molds in the production process of the battery monomer 400, and reducing the production cost of the battery monomer 400. Moreover, without distinguishing the structures of the first electrical connecting piece 3 and the second electrical connecting piece 4, the first electrical connecting piece 3 or the second electrical connecting piece 4 can be connected between the first tab 21 and the first pole 121 and between the second tab 22 and the second pole 122, which is beneficial to reduce the risk of reverse installation of the first electrical connecting piece 3 and the second electrical connecting piece 4, thereby reducing the assembly difficulty of the battery monomer 400, and improving the production efficiency of the battery monomer 400.

[0151] According to some embodiments of the present application, referring to Figure 7 , Figures 10-12 As shown in FIG. 1, the electrode assembly 2 is provided with a plurality of second tabs 22 at the end of the second tab 22.

[0152] In the above technical solution, the structure of the second electrical connecting piece 4 is the same as that of the first electrical connecting piece 3, so that the structure of the second electrical connecting piece 4 is reasonable, and the second electrical connecting piece 4 and the first electrical connecting piece 3 can be machined by the same mold, thereby reducing the number of molds in the production process of the battery monomer 400, and reducing the production cost of the battery monomer 400. Moreover, without distinguishing the structures of the first electrical connecting piece 3 and the second electrical connecting piece 4, the first electrical connecting piece 3 or the second electrical connecting piece 4 can be connected between the first tab 21 and the first pole 121 and between the second tab 22 and the second pole 122, which is beneficial to reduce the risk of reverse installation of the first electrical connecting piece 3 and the second electrical connecting piece 4, thereby reducing the assembly difficulty of the battery monomer 400, and improving the production efficiency of the battery monomer 400.

[0153] Further, by providing two second tabs 22, the use reliability of the electrode assembly 2 can be improved. When one of the second tabs 22 fails due to aging, the other second tab 22 can continue to play an electrically conductive role, so that the current of the electrode assembly 2 can be transmitted to the second electrical connecting piece 4 through the second tab 22, and then be guided out to the external circuit through the second pole 122, thereby improving the use reliability of the battery monomer 400 and effectively prolonging the service life of the battery monomer 400.

[0154] In the technical solution, the second electrode tabs 22 are arranged at the end of the electrode assembly 2, which can increase the current channel inside the electrode assembly 2, so that the current is more evenly distributed inside the battery monomer 400, effectively reduces the local current density, and is beneficial to reduce the safety risks such as local overheating of the battery monomer 400, thereby improving the charging and discharging capacity of the battery monomer 400 and improving the fast charging performance of the battery monomer 400. The use reliability of the electrode assembly 2 can also be improved. When one of the second electrode tabs 22 fails due to aging, the other second electrode tab 22 can continue to play an electrically conductive role, so that the current of the electrode assembly 2 can be transmitted to the second electrical connection 4 through the second electrode tab 22, and then be led out to the external circuit through the second electrode post 122. Thus, the use reliability of the battery monomer 400 is improved, and the service life of the battery monomer 400 is effectively prolonged.

[0155] According to some embodiments of the present application, referring to FIGS. 1-3, at least part of the second electrode tabs 22 arranged at the same end of the electrode assembly 2 are arranged along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other; and / or at least part of the second electrode tabs 22 arranged at the same end of the electrode assembly 2 are arranged along the first direction. Figure 7 Figure 10 According to some embodiments of the present application, referring to FIGS. 1-3, at least part of the second electrode tabs 22 arranged at the same end of the electrode assembly 2 are arranged along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other; and / or at least part of the second electrode tabs 22 arranged at the same end of the electrode assembly 2 are arranged along the first direction.

[0156] According to some embodiments of the present application, referring to FIGS. 1-3, at least part of the second electrode tabs 22 arranged at the same end of the electrode assembly 2 are arranged along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other; and / or at least part of the second electrode tabs 22 arranged at the same end of the electrode assembly 2 are arranged along the first direction. Figure 1 According to some embodiments of the present application, referring to FIGS. 1-3, at least part of the second electrode tabs 22 arranged at the same end of the electrode assembly 2 are arranged along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other; and / or at least part of the second electrode tabs 22 arranged at the same end of the electrode assembly 2 are arranged along the first direction.

[0157] According to some embodiments of the present application, referring to FIGS. 1-3, at least part of the second electrode tabs 22 arranged at the same end of the electrode assembly 2 are arranged along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other; and / or at least part of the second electrode tabs 22 arranged at the same end of the electrode assembly 2 are arranged along the first direction. Figure 7 ​As shown, two second tabs 22 located at the same end of the electrode assembly 2 are arranged along a third direction. This arrangement allows for a reasonable number and position of the second tabs 22. By providing two second tabs 22 arranged along a third direction at the end of the electrode assembly 2, the uniformity of the arrangement of the second tabs 22 at the end of the electrode assembly 2 can be improved. This facilitates the uniform transmission of current through multiple second tabs 22, thereby making the current more evenly distributed within the battery cell 400. This effectively reduces the local current density, which helps to reduce safety risks such as local overheating of the battery cell 400, thereby improving the charging and discharging capabilities of the battery cell 400 and enhancing its fast charging performance.

[0158] like Figure 10 and Figure 11 As shown, the arrangement of two second tabs 22 located at the same end of the electrode assembly 2 along the first direction allows for a reasonable arrangement of the number and position of the second tabs 22. By providing two second tabs 22 arranged along the first direction at the end of the electrode assembly 2, the uniformity of the arrangement of the second tabs 22 along the first direction at the end of the electrode assembly 2 can be improved. This facilitates the uniform transmission of current through multiple second tabs 22, thereby making the current more evenly distributed inside the battery cell 400, effectively reducing the local current density, which helps to reduce safety risks such as local overheating of the battery cell 400, thereby improving the charging and discharging capabilities of the battery cell 400 and enhancing its fast charging performance.

[0159] In the above technical solution, by arranging at least a portion of the second tabs 22 at the same end of the electrode assembly 2 along a third direction and arranging at least a portion of the second tabs 22 at the same end of the electrode assembly 2 along a first direction, so that the end of the electrode assembly 2 is provided with multiple second tabs 22 along both the first and third directions, the uniformity of the arrangement of the second tabs 22 at the end of the electrode assembly 2 can be improved. This is beneficial for the current to be uniformly transmitted through the multiple second tabs 22, thereby making the current more evenly distributed inside the battery cell 400, effectively reducing the local current density, which is beneficial for reducing safety risks such as local overheating of the battery cell 400, thereby improving the charging and discharging capacity of the battery cell 400 and enhancing the fast charging performance of the battery cell 400.

[0160] According to some embodiments of this application, refer to Figure 6 and Figure 11 As shown, a second connecting portion 411 is formed on the edge of the second limiting wall 41, and the second connecting portion 411 is connected to the corresponding second electrode tab 22.

[0161] In some embodiments, the edge of the second limiting wall 41 is formed with a second connecting part 411 in the third direction. In some embodiments of the present application, the second connecting part 411 and the second limiting wall 41 can be integrally formed, that is, the second connecting part 411 and the second limiting wall 41 are configured as an integrally formed piece. The integrally formed piece has good structural strength. By integrally forming the second connecting part 411 and the second limiting wall 41, the connection reliability of the second connecting part 411 and the second limiting wall 41 can be improved, and the probability of breaking at the connection between the second connecting part 411 and the second limiting wall 41 can be reduced, thereby improving the use reliability of the battery monomer 400. In some embodiments of the present application, the second connecting part 411 and the second limiting wall 41 can be welded.

[0162] The number of second connecting parts 411 can be at least one, for example, one, two, four or more second connecting parts 411 can be provided. The number of second connecting parts 411 can be adapted to the number of second tabs 22, so that each second tab 22 has a corresponding second connecting part 411 connected thereto. By connecting the second connecting part 411 to the corresponding second tab 22, for example, by welding the second connecting part 411 to the corresponding second tab 22, or by snap connecting the second connecting part 411 to the corresponding second tab 22, the second connecting part 411 can be conveniently connected to the corresponding second tab 22, which is conducive to improving the assembly efficiency. The second tab 22 and the second connecting part 411 can also be connected through the second connecting part 411, thereby realizing the effect of connecting the second tab 22 to the second pole 122 through the second connecting part 4, which is conducive to the electrode assembly 2 discharging in sequence through the second tab 22, the second connecting part 4 and the second pole 122, or the current flowing in sequence through the second pole 122, the second connecting part 4 and the second tab 22 to charge the electrode assembly 2, thereby realizing the effect of charging or discharging the battery monomer 400 as needed.

[0163] Further, since the second connecting part 4 generally has high conductivity and good heat dissipation performance, the second pole 122 and the second tab 22 are connected through the second connecting part 4, which can make the current flow smoothly between the second tab 22 and the second pole 122, which is conducive to reducing the energy loss of the battery monomer 400, and also conducive to making the current density of the electrode assembly 2 more uniformly distributed, thereby reducing the risk of local overheating of the battery monomer 400, effectively improving the charging performance of the battery monomer 400, and thereby improving the fast charging performance of the battery monomer 400.

[0164] As an embodiment, Figure 11As shown, along the third direction, one side edge of the second limiting wall 41 is formed with a second connecting part 411, and the number of the second connecting part 411 can be one, two or more. As another embodiment, along the first direction, one side edge of the second limiting wall 41 away from the second connecting wall 42 is formed with a second connecting part 411, and the number of the second connecting part 411 can be one, two or more. By forming the second connecting part 411 on the edge of the second limiting wall 41, the number and position of the second connecting part 411 can be set flexibly, and the number and position of the second connecting part 411 can be set according to the number and position of the second lug 22, thereby improving the versatility of the second electric connecting piece 4.

[0165] In the above technical solution, by forming the second connecting part 411 on the edge of the second limiting wall 41, the second connecting part 411 is connected with the corresponding second lug 22, which facilitates the connection of the second connecting part 411 with the corresponding second lug 22, improves the assembly efficiency, and enables the second lug 22 to be connected with the second electric connecting piece 4 through the second connecting part 411, thereby realizing the effect that the second lug 22 is connected with the second pole 122 through the second electric connecting piece 4, which facilitates the electrode assembly 2 to be discharged in sequence through the second lug 22, the second electric connecting piece 4 and the second pole 122, or the current to be charged to the electrode assembly 2 in sequence through the second pole 122, the second electric connecting piece 4 and the second lug 22, thereby realizing the effect that the battery monomer 400 can be charged or discharged as needed.

[0166] Further, since the second electric connecting piece 4 usually has high conductivity and good heat dissipation performance, the second pole 122 and the second lug 22 are connected through the second electric connecting piece 4, which enables the current to flow smoothly between the second lug 22 and the second pole 122, facilitates to reduce the energy loss of the battery monomer 400, and also facilitates to make the current density of the electrode assembly 2 more uniformly distributed, thereby reducing the risk of local overheating of the battery monomer 400, effectively improving the charging performance of the battery monomer 400, and further improving the fast charging performance of the battery monomer 400.

[0167] According to some embodiments of the present application, referring to Figure 9 and Figure 13 As shown, the second electric connecting piece 4 can further include a second connecting wall 42, which is located between the cover body 12 and the electrode assembly 2, and the second connecting wall 42 is connected with the second limiting wall 41 and the second pole 122.

[0168] The second connecting wall 42 is located between the cover body 12 and the electrode assembly 2 in the first direction, and the second connecting wall 42 can limit the electrode assembly 2, reduce the risk of movement of the electrode assembly 2 in the first direction, improve the stability of the electrode assembly 2, reduce the risk of the insulation film 5 being worn out due to the movement of the electrode assembly 2, and help reduce the risk of the battery monomer 400 internal short circuit caused by the direct contact between the electrode assembly 2 and the shell main body 11, thereby improving the use safety and service life of the battery monomer 400.

[0169] The second connecting wall 42 is connected with the second limiting wall 41 and the second pole column 122, and as some embodiments of the present application, the second connecting wall 42 can be directly connected with the second limiting wall 41 and the second pole column 122 by welding. By connecting the second connecting wall 42 with the second limiting wall 41 and the second pole column 122, the second tab 22 can be connected with the second pole column 122 through the second electric connecting piece 4, which helps the electrode assembly 2 to be discharged in sequence through the second tab 22, the second electric connecting piece 4 and the second pole column 122, or the current to be charged to the electrode assembly 2 in sequence through the second pole column 122, the second electric connecting piece 4 and the second tab 22, thereby realizing the effect that the battery monomer 400 can be charged or discharged as needed.

[0170] It should be noted that when the electrode assembly 2 is provided with the second tab 22 at both ends in the second direction, the second connecting wall 42 is provided with the second limiting wall 41 at both ends in the second direction, so that the second tab 22 at both ends of the electrode assembly 2 can be connected with the second electric connecting piece 4. When the electrode assembly 2 is provided with the second tab 22 at one end in the second direction, the second connecting wall 42 is provided with the second limiting wall 41 at one end in the second direction, and the second limiting wall 41 is arranged between the end of the electrode assembly 2 provided with the second tab 22 and the shell main body 11, thereby reducing the production cost of the second electric connecting piece 4.

[0171] In the above technical solution, by arranging the second connecting wall 42 between the cover body 12 and the electrode assembly 2, and connecting the second connecting wall 42 with the second limiting wall 41 and the second pole column 122, the risk of movement of the electrode assembly 2 in the first direction can be reduced, thereby improving the stability of the electrode assembly 2, reducing the risk of the insulation film 5 being worn out due to the movement of the electrode assembly 2, and helping to reduce the risk of the battery monomer 400 internal short circuit caused by the direct contact between the electrode assembly 2 and the shell main body 11, thereby improving the use safety and service life of the battery monomer 400. The second tab 22 can also be connected with the second pole column 122 through the second electric connecting piece 4, which helps the electrode assembly 2 to be discharged in sequence through the second tab 22, the second electric connecting piece 4 and the second pole column 122, or the current to be charged to the electrode assembly 2 in sequence through the second pole column 122, the second electric connecting piece 4 and the second tab 22, thereby realizing the effect that the battery monomer 400 can be charged or discharged as needed.

[0172] According to some embodiments of the present application, referring to Figure 9 and Figure 13 As shown in the drawings, the second connecting wall 42 is formed with a connecting boss 321 facing the end surface of the second pole column 122, and the connecting boss 321 is connected with the second pole column 122.

[0173] The second connecting wall 42 is formed with the connecting boss 321, and as some embodiments of the present application, the connecting boss 321 can be configured as a cylindrical boss. As some embodiments of the present application, the connecting boss 321 can be configured as a prismatic boss. In the first direction, the second connecting wall 42 can have two opposite side surfaces, and the connecting boss 321 is formed on the side surface of the second connecting wall 42 facing the second pole column 122. In this way, the position of the connecting boss 321 is reasonably arranged, and the connecting boss 321 is convenient to connect with the second pole column 122. As some embodiments of the present application, the connecting boss 321 can be welded with the second pole column 122. As some embodiments of the present application, the connecting boss 321 can be connected with the second pole column 122 by clamping. By arranging the connecting boss 321 on the second connecting wall 42 facing the second pole column 122, the second connecting wall 42 and the second pole column 122 can be connected through the connecting boss 321, which reduces the connection difficulty of the second connecting wall 42 and the second pole column 122, thereby improving the assembly efficiency of the battery monomer 400.

[0174] As some embodiments of the present application, as shown in Figure 9 The plastic part 7 can be provided with a relief hole 71, and the size and shape of the relief hole 71 on the plastic part 7 between the second connecting wall 42 and the cover 12 are matched with the size and shape of the connecting boss 321. When the connecting boss 321 is connected with the second pole column 122, the connecting boss 321 can pass through the plastic part 7 between the second connecting wall 42 and the cover 12, so that the connecting boss 321 and the second pole column 122 can be smoothly connected.

[0175] In the above technical solution, the second connecting wall 42 is formed with the connecting boss 321 facing the end surface of the second pole column 122, and the connecting boss 321 is connected with the second pole column 122. In this way, the position of the connecting boss 321 is reasonably arranged, and the connecting boss 321 is convenient to connect with the second pole column 122 through the connecting boss 321, which reduces the connection difficulty of the second connecting wall 42 and the second pole column 122, thereby improving the assembly efficiency of the battery monomer 400.

[0176] As some embodiments of the present application, referring to Figure 4 and Figure 10As shown, along the second direction, the first electrical connecting member 3 and the second electrical connecting member 4 are both provided with a support structure 8, which can be configured as a supporting plate. By providing the support structure 8 between the first electrical connecting member 3, the second electrical connecting member 4 and the shell main body 11, the support structure 8 can support the electrode assembly 2, improve the position stability of the electrode assembly 2 in the shell main body 11, and reduce the risk of shaking or moving of the electrode assembly 2 in the shell. When the battery monomer 400 is subjected to external impact, the support structure 8 can absorb and disperse the impact force, reduce the risk of damage to the electrode assembly 2 caused by direct impact of the electrode assembly 2, and further improve the use safety of the battery monomer 400.

[0177] According to some embodiments of the present application, the present application further provides a battery device 100 comprising the battery monomer 400 described above.

[0178] According to some embodiments of the present application, the present application further provides a battery device 100 comprising the battery monomer 400 described above.

[0179] As some embodiments of the present application, the electric device can be a vehicle 1000.

[0180] The electric device can be a device or system of any of the above-mentioned application battery devices 100.

[0181] As some embodiments of the present application, as shown, Figures 3-9 The shell 1 comprises a shell main body 11, a first cover 123 and a second cover 124, the shell main body 11 is configured in a ring shape, the first cover 123 and the second cover 124 are arranged opposite and spaced apart along a first direction, and the shell main body 11 is connected between the first cover 123 and the second cover 124. The first cover 123 and the second cover 124 cover the open end of the shell main body 11 and are fixedly connected with the shell main body 11 to jointly define a mounting cavity 13, the first cover 123 is provided with a first pole 121, and the second cover 124 is provided with a second pole 12.

[0182] The electrode assembly 2 is arranged in the mounting cavity 13, and the electrode assembly 2 and the cover 12 are arranged along a first direction. Along a second direction, two first tabs 21 and two second tabs 22 are respectively formed at two ends of the electrode assembly 2. On the two ends of the electrode assembly 2, the two first tabs 21 are arranged opposite along a third direction, and the two second tabs 22 are arranged opposite along the third direction. The first direction, the second direction and the third direction are perpendicular.

[0183] The first electric connecting piece 3 is arranged in the mounting cavity 13, the first electric connecting piece 3 comprises two first limiting walls 31 and a first connecting wall 32, the first connecting wall 32 is located between the first cover body 123 and the electrode assembly 2, the two first limiting walls 31 are respectively arranged at two ends of the first connecting wall 32 along the second direction, and along the second direction, the two first limiting walls 31 are respectively located between the end of the electrode assembly 2 provided with the first tab 21 and the shell main body 11, and the first connecting wall 32 can be formed with a connecting boss 321, and the first connecting wall 32 is connected with the first pole 121 through the connecting boss 321.

[0184] The two first limiting walls 31 are respectively formed with a first connecting part 311 at two ends along the third direction, the first connecting part 311 is connected with the corresponding first tab 21, the two first limiting walls 31 are connected with the corresponding first tab 21 through the corresponding first connecting part 311 by arranging the first connecting wall 32 connected with the first pole 121 through the connecting boss 321, and the two first limiting walls 31 are connected with the first connecting wall 32, so that the first tab 21 and the first pole 121 can be connected through the first electric connecting piece 3.

[0185] The second electric connecting piece 4 is arranged in the mounting cavity 13, the second electric connecting piece 4 comprises two second limiting walls 41 and a second connecting wall 42, the second connecting wall 42 is located between the second cover body 124 and the electrode assembly 2, the two second limiting walls 41 are respectively arranged at two ends of the second connecting wall 42 along the second direction, and along the second direction, the two second limiting walls 41 are respectively located between the end of the electrode assembly 2 provided with the second tab 22 and the shell main body 11, and the second connecting wall 42 can be formed with a connecting boss 321, and the second connecting wall 42 is connected with the second pole 122 through the connecting boss 321.

[0186] The two second limiting walls 41 are respectively formed with a second connecting part 411 at two ends along the third direction, the second connecting part 411 is connected with the corresponding second tab 22, the two second limiting walls 41 are connected with the corresponding second tab 22 through the corresponding second connecting part 411 by arranging the second connecting wall 42 connected with the second pole 122 through the connecting boss 321, and the two second limiting walls 41 are connected with the second connecting wall 42, so that the second tab 22 and the second pole 122 can be connected through the second electric connecting piece 4.

[0187] The insulating film 5 can be arranged between the electrode assembly 2 and the shell body 11, the PET sheet 6 can be arranged between the electrode assembly 2 and the first electrical connector 3 and between the electrode assembly 2 and the second electrical connector 4, and the plastic piece 7 can be arranged between the first electrical connector 3 and the cover body 12, between the second electrical connector 4 and the cover body 12, between the first pole 121 and the cover body 12, and between the second pole 122 and the cover body 12. In this way, the battery monomer 400 can be arranged reasonably, the risk of internal short circuit of the battery monomer 400 can be reduced, the use reliability and safety of the battery monomer 400 can be improved, and the service life of the battery monomer 400 can be effectively prolonged.

[0188] The plastic piece 7 between the first electrical connector 3 and the cover body 12 and the plastic piece 7 between the second electrical connector 4 and the cover body 12 are both formed with a relief hole 71, which avoids the connection boss 321, so that the first electrical connector 3 and the first tab 21 and the second electrical connector 4 and the second tab 22 are successfully connected. In the second direction, the shell body 11 has a mounting wall 111, which is provided with an explosion-proof structure 112 and a liquid injection hole 113. In the second direction, the first electrical connector 3 and the second electrical connector 4 are both provided with a support structure 8 between the shell body 11, which can be configured as a supporting plate.

[0189] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0190] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0191] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized by, The application relates to a battery shell, which comprises a shell body and a cover body fixedly connected to jointly define a mounting cavity, wherein the cover body is provided with a first pole column and a second pole column; an electrode assembly is arranged in the mounting cavity, the electrode assembly and the cover body are arranged along a first direction, and the end of the electrode assembly is provided with a first lug and a second lug along a second direction, wherein the first direction and the second direction are perpendicular; a first electric connecting piece is arranged in the mounting cavity, at least part of the first electric connecting piece is located between the end of the electrode assembly provided with the first lug and the shell body, and the first electric connecting piece is connected with the first pole column and the first lug; a second electric connecting piece is arranged in the mounting cavity, at least part of the second electric connecting piece is located between the end of the electrode assembly provided with the second lug and the shell body, and the second electric connecting piece is connected with the second pole column and the second lug. The first electric connecting piece comprises a first limiting wall, at least one end of the electrode assembly is provided with the first lug along the second direction, the first limiting wall is arranged between the end of the electrode assembly provided with the first lug and the shell body, and the first limiting wall is connected with the corresponding first lug. The end of the electrode assembly provided with the first lug is provided with a plurality of first lugs. At least part of the first lugs of the plurality of first lugs located at the same end of the electrode assembly are arranged along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other. The first limiting wall is connected with the corresponding first lug.

2. The battery cell of claim 1, wherein, The first electric connecting piece further comprises a first connecting wall, the first connecting wall is located between the cover body and the electrode assembly, and the first connecting wall is connected with the first limiting wall and the first pole column.

3. The battery cell of claim 2, wherein, The end surface of the first connecting wall facing the first pole column is provided with a connecting boss connected with the first pole column.

4. The battery cell of claim 3, wherein, The cover body comprises a first cover body and a second cover body, the first cover body and the second cover body are opposite and spaced apart along the first direction, the shell body is connected between the first cover body and the second cover body, the first cover body is provided with the first pole column, the second cover body is provided with the second pole column, part of the first electric connecting piece is located between the first cover body and the electrode assembly, and part of the second electric connecting piece is located between the second cover body and the electrode assembly. The shell body is provided with an explosion-proof structure and / or a liquid injection hole along the second direction. The second electric connecting piece comprises a second limiting wall, at least one end of the electrode assembly is provided with the second lug along the second direction, the second limiting wall is arranged between the end of the electrode assembly provided with the second lug and the shell body, and the second limiting wall is connected with the corresponding second lug.

5. The battery cell of claim 2, wherein, ​ 6. The battery cell of claim 2, wherein, ​ 7. The battery cell of claim 6, wherein, ​ 8. The battery cell of claim 1, wherein, ​ 9. The battery cell of claim 1, wherein, ​ 10. The battery cell of any one of claims 1-9, wherein, ​ 11. The battery cell of claim 10, wherein, The second electrical connection has the same structure as the first electrical connection.

12. A battery device characterized by comprising: A battery cell according to any one of claims 1-11.

13. An electrical device, comprising: A battery device according to claim 12.

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