Electrode assembly, battery cell, battery and electric device

Abstract

The utility model discloses an electrode assembly, a battery monomer, a battery and a power utilization device. The battery cell includes a housing and an electrode assembly. The shell is provided with a containing cavity, and the electrode assembly is arranged in the containing cavity. The electrode assembly comprises a plurality of electrode plates which are stacked in the first direction, and each electrode plate comprises a plate body and a tab. The number of the tabs in each electrode plate is at least two, the two tabs are connected to the two sides of the electrode plate body in the second direction respectively, and the second direction intersects with the first direction. The two tabs are respectively arranged on the two opposite sides of the pole piece body, so that the farthest distance from the active substance to the tabs is shortened, the transmission path of current on the pole piece is shorter, the resistance is smaller, the phenomena of local polarization and lithium precipitation of the pole piece are further reduced, and meanwhile, local heat accumulation is reduced. Therefore, by adopting the structure, the operation stability of the battery monomer is improved, and the battery can keep better performance in long-term use.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to an electrode assembly, a battery cell, a battery, and an electrical device. Background Art

[0002] Batteries are widely used in electronic devices, such as mobile phones, laptops, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, and energy storage systems, etc.

[0003] Currently, how to improve the polarization phenomenon of a battery cell while increasing the energy density of the battery cell is also one of the problems studied in this field. Summary of the Utility Model

[0004] In view of the above problems, the present application provides an electrode assembly, a battery cell, a battery, and an electrical device, which can improve the heat dissipation efficiency of a high-energy density battery cell, reduce local lithium deposition and polarization phenomenon of the electrode tab, and improve the performance of the battery cell.

[0005] In a first aspect, the present application provides a battery cell, including a housing and an electrode assembly. The housing has a receiving cavity, and the electrode assembly is disposed in the receiving cavity. The electrode assembly includes a plurality of electrode tabs stacked along a first direction. The electrode tab includes a tab body and a tab ear. The number of tab ears in each electrode tab is at least two, and the two tab ears are respectively connected to two sides of the tab body along a second direction, and the second direction intersects with the first direction.

[0006] In the technical solution of the embodiment of the present application, the number of tab ears in the tab is increased, which reduces the local lithium deposition phenomenon of the tab caused by uneven distribution of electric field and heat during operation of the single-sided tab ear, and at the same time improves the overcurrent capacity of the electrode assembly, making the battery more stable during high-current discharge or charge. The two tab ears are respectively arranged on opposite sides of the tab body, shortening the farthest distance from the active material to the tab ear, making the current transmission path on the tab shorter and the resistance smaller, further reducing the local polarization and lithium deposition phenomena of the tab, and at the same time reducing the local heat accumulation. Therefore, the above structure improves the stability of the operation of the battery cell, making the battery maintain better performance during long-term use.

[0007] In some embodiments, the extension length of the electrode tab body in the second direction is L1, and the extension width of the electrode tab body in the third direction is W1. The third direction intersects the plane where the first direction and the second direction are located, and L1 and W1 satisfy the relationship W1 ≤ L1. In the above structure, by arranging two electrode tabs on the two sides with larger dimensions of the electrode tab body, the maximum distance between the active material and the electrode tab can be shortened, the current transmission path on the electrode tab is shorter, and the resistance is smaller. The phenomena of local polarization and lithium deposition of the electrode tab are reduced, and at the same time, the local heat accumulation is reduced, and the operation stability of the battery cell is improved.

[0008] In some embodiments, the electrode tab body includes a current collector, an active material layer, and a highly conductive layer. The current collector is connected to the electrode tab, and the active material layer is disposed on at least one surface of the current collector. The highly conductive layer is disposed between the current collector and the active material layer, and the orthographic projection of the highly conductive layer on the current collector is located in the region of the current collector close to the electrode tab. In the above structure, by arranging the highly conductive layer in the region near the electrode tab, the current uniformity between the electrode tab body and the electrode tab is improved, thereby improving the current stability of the electrode assembly.

[0009] In some embodiments, along the direction of the electrode tab body towards the electrode tab, the width of the electrode tab gradually decreases. In the above structure, by increasing the width of the connection between the electrode tab and the electrode tab body, the structural strength of the connection between the electrode tab and the electrode tab body can be improved, and at the same time, the area of the electrode tab is increased, the current distribution uniformity is improved, and the interference between the ends of two adjacent electrode tabs is reduced, and the assembly difficulty is reduced and the assembly efficiency is improved.

[0010] In some embodiments, the electrode assembly includes an insulating layer, the insulating layer wraps the outside of the electrode tab body, and a plurality of through holes are provided at positions corresponding to the electrode tabs on the insulating layer, and the electrode tabs extend out from the through holes. In the above structure, by providing the insulating layer, the insulation performance between the electrode assembly and the outer shell is improved. By providing through holes on the insulating layer to allow only the electrode tabs to pass through, the convenience of connecting the electrode tabs to the end cover can be improved, and at the same time, the risk of the electrode tabs folding and being inserted reversely into the electrode tab body is reduced, and the operation stability of the battery cell is improved.

[0011] In some embodiments, the electrode tab includes a first electrode tab and a second electrode tab with opposite polarities. The first electrode tab includes two first electrode tabs, and the second electrode tab includes two second electrode tabs. The orthographic projection of the first electrode tab on the outer shell and the orthographic projection of the second electrode tab on the outer shell are staggered. In the above structure, by staggering the electrode tabs of the cathode electrode tab and the anode electrode tab, the short-circuit risk between the cathode electrode tab and the anode electrode tab can be reduced, and the operation stability is improved.

[0012] In some embodiments, the outer shell includes a housing and two end caps. The housing has two openings oppositely arranged in the second direction, and the two end caps are respectively closed on the two openings. At least two electrode terminals are provided on each end cap, and the two electrode terminals are electrically connected to the first tab and the second tab respectively. In the above structure, by providing two end caps and respectively providing electrode terminals on the two end caps, the passage between the electrode assembly and the outside can be increased, and the overcurrent capacity can be improved.

[0013] In some embodiments, the outer shell further includes two pressure relief mechanisms, and the two pressure relief mechanisms are respectively arranged on the two end caps. In the above technical solution, by providing two pressure relief mechanisms, exhaust can be carried out from two directions, reducing the accumulation of gas in the outer shell and reducing the risk of explosion of the battery cell caused by poor exhaust.

[0014] In some embodiments, the first electrode sheet further includes a first electrode sheet body and two third tabs. The two first tabs are respectively connected to both sides of the first electrode sheet body in the second direction, and the two third tabs are respectively connected to one side of the first electrode sheet body in the third direction, and the third direction intersects with the plane where the first direction and the second direction are located. In the above structure, by providing the third tabs, the number of tabs is further increased, the electric field distribution of the first electrode sheet body is made uniform in four directions, the heat accumulation is dispersed, and the operating stability of the battery cell is improved.

[0015] In some embodiments, the outer shell includes a bottom plate, a top plate and side plates. The top plate and the bottom plate are oppositely arranged, and the side plates are arranged between the bottom plate and the top plate. The number of side plates is four, and the four side plates are sequentially connected end to end. Two electrode terminals are respectively provided on each side plate. In the above structure, a stable structural space is formed by providing the bottom plate, the top plate and the side plates, providing a stable operating environment for the operation of the electrode assembly. By providing electrode terminals on the side plates, the connection between battery cells can be facilitated.

[0016] In some embodiments, the outer shell further includes a connecting piece, which is arranged on the side of the side plate facing the accommodating cavity, and one side of the connecting piece is electrically connected to the tab. The electrode terminal includes a pole column and a connecting plate, and a pole column hole is provided on the side plate. The pole column passes through the pole column hole and is connected to the side plate. One end of the pole column is connected to the side of the connecting piece facing away from the tab, and the connecting plate is arranged on the side of the side plate facing away from the accommodating cavity and is connected to the pole column. In the above structure, by providing the connecting piece to connect multiple tabs, and providing the pole column hole to lead the electric energy from inside the outer shell to outside the outer shell, and providing the connecting plate to facilitate the connection between the battery cell and other components, the assembly convenience is improved.

[0017] In a second aspect, the present application provides an electrode assembly, which includes a plurality of electrode tabs stacked along a first direction. The electrode tab includes a tab body and an ear tab. The number of ear tabs in each electrode tab is at least two. The two ear tabs are respectively connected to two sides of the tab body along a second direction, and the second direction intersects with the first direction.

[0018] In the above structure, the number of ear tabs in the tab is increased, which reduces the phenomenon of local lithium plating on the tab caused by uneven distribution of electric field and heat during operation. At the same time, the over-current capacity of the electrode assembly is improved, making the battery more stable during high-current discharge or charging. By respectively arranging the two ear tabs on opposite sides of the tab body, the farthest distance from the active material to the ear tab is shortened, the current transmission path on the tab is shorter, and the resistance is smaller. The phenomenon of local polarization and lithium plating of the tab is reduced, and at the same time, local heat accumulation is reduced. Because the current distribution is more uniform, local overheating caused by excessive current is reduced. Therefore, the above structure improves the stability of the battery cell operation and enables the battery to maintain better performance during long-term use.

[0019] In a third aspect, the present application provides a battery, which includes the battery cell in the above embodiment or the electrode assembly in the above embodiment.

[0020] In a fourth aspect, the present application provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0021] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. Description of the Drawings

[0022] Next, the features, advantages and technical effects of the exemplary embodiments of the present application will be described with reference to the drawings.

[0023] Figure 1 Schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0024] Figure 2 Schematic structural diagram of a battery module provided in an embodiment of the present application;

[0025] Figure 3 Schematic structural diagram of a box body provided in an embodiment of the present application;

[0026] Figure 4 Schematic structural diagram of a battery cell provided in an embodiment of the present application;

[0027] Figure 5 Schematic structural diagram of an electrode assembly provided in an embodiment of the present application;

[0028] Figure 6 Schematic cross-sectional structure diagram of an electrode tab provided by an embodiment of the present application;

[0029] Figure 7 Schematic structure diagram of an electrode tab provided by an embodiment of the present application;

[0030] Figure 8 Schematic partial structure diagram of an electrode assembly provided by an embodiment of the present application;

[0031] Figure 9 Schematic structure diagram of an electrode assembly provided by another embodiment of the present application;

[0032] Figure 10 Schematic structure diagram of an electrode tab provided by another embodiment of the present application;

[0033] Figure 11 Schematic partial structure diagram of a housing provided by an embodiment of the present application.

[0034] Detailed description of reference numerals

[0035] 1. Vehicle; X. First direction; Y. Second direction; Z. Third direction; 2. Battery; 10. Electrode assembly; 101. Electrode tab; 102. Tab body; 103. Tab ear; 105. Current collector; 106. Active material layer; 107. High-conductivity layer; 108. Conductor; 109. Insulating part; 110. Insulating layer; 111. First tab; 112. Second tab; 113. First tab ear; 114. Second tab ear; 115. Third tab; 116. First tab body; 117. Third tab ear; 20. Housing; 24. Pressure relief mechanism; 25. Electrode terminal; 30. End cover; 40. Outer shell; 401. Bottom plate; 402. Side plate; 403. Adapter plate; 404. Connection plate; 3. Controller; 4. Motor; 5. Box body; 51. First box body part; 52. Second box body part; 53. Accommodating space; 6. Battery module; 7. Battery cell. Detailed implementation manners

[0036] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0038] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0039] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0041] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0042] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0043] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can also be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0044] In the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after.

[0045] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of simplicity, in different embodiments, the detailed description of the same components is omitted. 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, as well as the overall thickness, length, width and other dimensions of the integrated device are only illustrative and should not constitute any limitation to the present application.

[0046] In the case of the increasing demand for the energy density of battery cells, how to improve the energy density of battery cells has become one of the problems studied in the art. In order to improve the energy density of battery cells, the inventors of the present application have tried to design the battery cells to be larger, especially to increase the size of the electrode assembly in the battery cells. Among them, the current on the battery electrode ultimately flows to the tab, so the current density is the largest near the tab. According to Joule's law, heat is generated when current passes through a conductor, and the heat is proportional to the square of the current. Therefore, due to the large current density near the tab, the Joule heat generated is also large. As the size of the battery cell increases, it is easier for the current field and heat distribution of the electrode assembly to be uneven near the tab of the electrode assembly, resulting in a large local polarization of the battery cell, leading to lithium plating, and thus resulting in a decline in the performance of the battery cell or even a direct drop in performance.

[0047] Based on the above situation, in the battery cell of the present application, the number of tabs is increased in the electrode sheet, reducing the local lithium plating phenomenon of the electrode sheet caused by uneven distribution of electric field and heat during operation on one side of the tab, while improving the overcurrent capacity of the electrode assembly, making the battery more stable during high-current discharge or charging. The two tabs are respectively arranged on the opposite sides of the electrode sheet body, shortening the farthest distance from the active material to the tab, with a shorter current transmission path and smaller resistance on the electrode sheet. The local polarization and lithium plating phenomena of the electrode sheet are reduced, and at the same time, the local heat accumulation is reduced because the current distribution is more uniform. At the same time, the local overheating caused by excessive current is also reduced. Therefore, the above structure improves the stability of the battery cell operation, enabling the battery to maintain better performance during long-term use.

[0048] The battery cell of the present application will be described in detail below.

[0049] 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 to continue to be used.

[0050] The battery cell can include but is not limited to lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium-metal battery cells, sodium-metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-metal hydride battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0051] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc., and there is no special limitation in the present application.

[0052] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0053] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. As Figure 2 shown, the multiple battery cells are stacked along the thickness direction to form a battery module.

[0054] In some embodiments, the battery can be a battery pack, which includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0055] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can become at least part of the floor of the vehicle, or part of the box body can become at least part of the crossbeam and longitudinal beam of the vehicle.

[0056] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0057] The battery disclosed in the embodiments of the present application can be used in an electrical device that uses the battery as a power source or various energy storage systems that use the battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and so on. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, and an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spaceship, etc.

[0058] For the convenience of description in the following embodiments, the electrical device is taken as a vehicle as an example for description.

[0059] Figure 1 It is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0060] As Figure 1 shown, a battery 2 is disposed inside the vehicle 1, and the battery 2 can be disposed at the bottom, head, or tail of the vehicle 1. The battery 2 can be used for power supply of the vehicle 1. For example, the battery 2 can be used as an operating power source of the vehicle 1.

[0061] The vehicle 1 may further include a controller 3 and a motor 4. The controller 3 is used to control the battery 2 to supply power to the motor 4. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1.

[0062] In some embodiments of the present application, the battery 2 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0063] Figure 2 It is a schematic structural diagram of a battery module provided in some embodiments of the present application. Figure 3 It is a schematic structural diagram of a box body provided in some embodiments of the present application. Combining Figure 2 and Figure 3 , the battery 2 includes a box body 5 and a battery module 6. A plurality of battery cells 7 form the battery module 6 and are accommodated in the box body 5.

[0064] The box body 5 is used to accommodate the battery cell 7, and the box body 5 can be a variety of structures. In some embodiments, the box body 5 can include a first box body part 51 and a second box body part 52, the first box body part 51 and the second box body part 52 cover each other, and the first box body part 51 and the second box body part 52 jointly define a storage space 53 for accommodating the battery cell. The second box body part 52 can be a hollow structure with one end open, the first box body part 51 is a plate-like structure, and the first box body part 51 covers the open side of the second box body part 52 to form a box body 5 with a storage space 53; the first box body part 51 and the second box body part 52 can also be a hollow structure with one side open, and the open side of the first box body part 51 covers the open side of the second box body part 52 to form a box body 5 with a storage space 53. Of course, the first box body part 51 and the second box body part 52 can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0065] In order to improve the sealing performance after the first box body 51 and the second box body 52 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 51 and the second box body 52 .

[0066] Assuming that the first box body portion 51 covers the top of the second box body portion 52 , the first box body portion 51 can also be referred to as an upper box cover, and the second box body portion 52 can also be referred to as a lower box body.

[0067] In the battery 2, the battery cell 7 can be one or more. If there are more than one battery cell 7, the battery cells 7 can be connected in series, in parallel or in mixed connection. Mixed connection means that the battery cells 7 are both connected in series and in parallel. The battery cells 7 can be directly connected in series, in parallel or in mixed connection, and then the whole formed by the battery cells 7 can be accommodated in the box 5; of course, the battery modules 6 can also be formed by connecting the battery cells in series, in parallel or in mixed connection, and then the battery modules 6 can be connected in series, in parallel or in mixed connection to form a whole and accommodated in the box 5.

[0068] In some optional embodiments, the battery cells 7 may also be directly accommodated in the box body 5 to reduce the connecting components or supporting components required to form the battery module 6 and improve the energy density of the battery 2.

[0069] In some embodiments, the battery 2 further includes a heat exchange plate, which is used to exchange heat with the battery cell 7. The heat exchange plate is usually provided with a heat exchange flow channel for the heat exchange medium to flow. The heat exchange medium flows away the heat of the battery cell 7, and the operating temperature of the battery cell 7 is controlled within a reasonable range to ensure the stability of the operation of the battery cell 7.

[0070] Exemplarily, the battery cell 7 may be the smallest unit constituting the battery 2 .

[0071] Figure 4Schematic diagram of the structure of a battery cell provided by some embodiments of the present application.

[0072] As Figure 4 shown, in some embodiments, the battery cell 7 includes a housing 40 and an electrode assembly 10 accommodated in the housing 40.

[0073] The electrode assembly 10 includes a positive electrode and a negative electrode. During the charging and discharging process of the battery cell 7, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. Optionally, the electrode assembly 10 further includes a separator disposed between the positive electrode and the negative electrode, and the separator can reduce the risk of short circuit between the positive and negative electrodes and at the same time allow active ions to pass through.

[0074] The housing 40 is used to encapsulate components such as the electrode assembly 10 and the electrolyte. The housing 40 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing 40), or an aluminum-plastic film, etc.

[0075] In some embodiments, the housing 40 includes a housing body 20 and an end cap 30, the housing body 20 has an opening, and the end cap 30 is used to cover the opening.

[0076] The housing body 20 is a component used to cooperate with the end cap 30 to form the internal cavity of the battery cell 7, and the formed internal cavity can be used to accommodate the electrode assembly 10, the electrolyte, and other components.

[0077] The housing body 20 and the end cap 30 can be independent components. Exemplarily, an opening can be provided on the housing body 20, and the end cap 30 is covered at the opening to form the internal cavity of the battery cell 7.

[0078] The end cap 30 is connected to the housing body 20 by welding, bonding, clamping or other means.

[0079] In some embodiments, the battery cell 7 further includes an electrolyte accommodated in the housing 40. The electrolyte plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid.

[0080] In some embodiments, the battery cell 7 includes electrode terminals 25. The electrode terminals 25 are electrically connected to the electrode assembly 10 for outputting or inputting the electric energy of the battery cell 7.

[0081] In some embodiments, the battery cell 7 includes a pressure relief mechanism 24, and the pressure relief mechanism 24 is used to rupture when the internal pressure of the battery cell 7 exceeds a threshold value to release the internal pressure of the battery cell 7.

[0082] Please refer to Figure 4 Figure 6 , Figure 4 which is a schematic diagram of the structure of a battery cell provided by an embodiment of the present application, Figure 5Schematic structural diagram of an electrode assembly provided by an embodiment of the present application Figure 6 Schematic cross-sectional structure diagram of an electrode tab provided by an embodiment of the present application

[0083] The battery cell 7 includes a housing 40 and an electrode assembly 10. The housing 40 has a receiving cavity, and the electrode assembly 10 is disposed in the receiving cavity. The electrode assembly 10 includes a plurality of electrode tabs 101 stacked along a first direction X. The electrode tab 101 includes a tab body 102 and a tab 103. The number of tabs 103 in each electrode tab 101 is at least two, and the two tabs 103 are respectively connected to both sides of the tab body 102 along a second direction Y, and the second direction Y intersects the first direction X.

[0084] It can be understood that, in order to clearly show the structure of the electrode tab 101 Figure 5 The schematic diagram shows the staggered folding of two tabs. Optionally, the number of electrode tabs 101 in the electrode assembly 10 is greater than 2, and the specific number can be set as required. Exemplarily, the number of electrode tabs 101 is 20, 30, 50, 80 or 100, etc.

[0085] Optionally, the second direction Y is perpendicular to the first direction X. Exemplarily, the first direction X is the thickness direction of the tab body 102, and the second direction Y is the height direction of the tab body 102.

[0086] Optionally, in the battery cell 7, the length L1 of the tab body 102 along the second direction Y is 200 mm ≤ L1 ≤ 300 mm. Exemplarily, L1 is: 210 mm, 230 mm, 250 mm, 280 mm or 300 mm.

[0087] In the related art, the length L2 of the electrode tab 101 of the battery cell 7 along the second direction Y is: 80 mm ≤ L2 ≤ 200 mm. In the embodiment of the present application, the tab body 102 is equivalent to twice the height of the tab in the related art. Therefore, the battery cell 7 in the present application has a higher grouping efficiency, fewer connection components and support components between two adjacent battery modules 6 along the second direction Y, and the energy density of the battery 2 is increased.

[0088] In the technical solution of the embodiment of the present application, the number of tabs 103 is increased in the electrode sheet, so as to reduce the local lithium plating phenomenon of the electrode sheet caused by uneven distribution of electric field and heat during operation of the single-sided tab 103. At the same time, the overcurrent capacity of the electrode assembly 10 is improved, making the battery 2 more stable during high-current discharge or charging. The two tabs 103 are respectively arranged on opposite sides of the electrode sheet body 102, shortening the farthest distance from the active material to the tab 103. The current transmission path on the electrode sheet is shorter and the resistance is smaller. The local polarization and lithium plating phenomena of the electrode sheet are reduced, and at the same time, the local heat accumulation is reduced. Because the current distribution is more uniform, the local overheating caused by excessive current is reduced. Therefore, the above structure improves the stability of the operation of the battery cell 7, enabling the battery 2 to maintain better performance during long-term use.

[0089] In some embodiments of the present application, the extension length of the electrode sheet body 102 along the second direction Y is L1, the extension width of the electrode sheet body 102 along the third direction Z is W1, the third direction Z intersects with the plane where the first direction X and the second direction Y are located, and L1 and W1 satisfy the relationship: W1 ≤ L1.

[0090] In the above structure, the distance for electrons to be transmitted between the active material and the tab 103 is reduced, thereby improving the energy density and power output of the battery 2. A shorter current transmission path means less obstacles for electrons to flow inside the battery 2. A smaller resistance results in less energy loss inside the battery 2, improving the energy efficiency and discharge performance of the battery 2. The shorter current transmission path and smaller resistance help to reduce the current density difference on the electrode sheet, thereby reducing the risk of local polarization and lithium plating. The smaller resistance and more uniform current distribution help to reduce the local heat accumulation and improve the thermal stability of the battery 2.

[0091] As Figure 6 shown, in some embodiments of the present application, the electrode sheet body 102 includes a current collector 105, an active material layer 106, and a high-conductivity layer 107. The current collector 105 is connected to the tab 103, and the active material layer 106 is provided on at least one surface of the current collector 105. The high-conductivity layer 107 is provided between the current collector 105 and the active material layer 106, and the orthographic projection of the high-conductivity layer 107 on the current collector 105 is located in the area of the current collector 105 close to the tab 103.

[0092] Optionally, the active material layer 106 is provided on two opposite surfaces of the current collector 105, and the high-conductivity layer 107 is respectively provided on two opposite surfaces of the current collector 105.

[0093] The high-conductivity layer 107 generally refers to a material layer with high electrical conductivity, and its electrical conductivity is much better than that of common electrode materials. Exemplarily, the material of the high-conductivity layer 107 can be selected from: a mixed glue layer of conductive carbon, carbon nanotubes, etc. The coating width of the high-conductivity layer 107 extends inwards by 10 mm to 30 mm along the edge of the electrode body 102.

[0094] In the above structure, the high-conductivity layer 107 is arranged in the area near the tab 103. The high-conductivity layer 107 can effectively reduce the transmission resistance of the current between the tab 103 and the electrode body 102, so that the current can be more evenly distributed on the entire electrode assembly 10. Due to the presence of the high-conductivity layer 107, when the current enters or leaves the electrode body 102 through the tab 103, it can be more quickly dispersed to the entire electrode body 102, rather than only concentrated in a narrow area near the tab 103. This dispersion effect reduces the non-uniformity of the current density, thereby reducing the risks of local polarization, lithium plating, and local heat accumulation of the electrode sheet.

[0095] Moreover, the improvement of the current uniformity means that the electrode assembly 10 can work more stably during the charge and discharge process, reducing the performance fluctuations caused by uneven current distribution. Thereby, the cycle life, energy density, and power output of the battery cell 7 are improved.

[0096] In some alternative embodiments, a receiving groove is formed by the partial surface of the active material layer 106 facing the current collector 105 being concave. The receiving groove is arranged at the edge of the active material layer 106 close to the tab 103, and the high-conductivity layer 107 is arranged in the receiving groove.

[0097] In the above structure, setting the receiving groove thins the edge of the active material layer 106, which can improve the overall thickness uniformity of the electrode assembly 10, and at the same time reduce the space volume occupied by the high-conductivity layer 107, improving the energy density of the battery cell 7.

[0098] In some alternative embodiments, the tab 103 includes a conductor 108 and an insulating part 109, and the conductor 108 is connected to the current collector 105. Optionally, the conductor 108 and the current collector 105 can be an integrally formed structure. The insulating part 109 is arranged on the surface of the conductor 108. Exemplarily, the insulating part 109 extends outwards along the surface of the conductor 108 close to the current collector 105, and the extended width is 3 mm to 20 mm. The insulating part 109 can be made by coating the surface of the conductor 108 with boehmite emulsion.

[0099] In some embodiments of the present application, along the direction of the electrode body 102 facing the tab 103, the width of the tab 103 gradually decreases. Exemplarily, the shape of the tab 103 can be trapezoidal, or Figure 7 a spire shape with a stepped edge forming a gradually decreasing width as shown.

[0100] In the above structure, by increasing the width of the connection between the tab 103 and the tab body 102, the structural strength of the connection can be effectively improved. This is because a wider connection area means a larger contact area and a stronger connection force, which can thus withstand a larger current and mechanical stress. Increasing the area of the tab 103 helps to improve the uniformity of current distribution. During the operation of the battery 2, the current flows into or out of the tab body 102 through the tab 103. If the area of the tab 103 is too small, the current may concentrate in a certain local area of the tab 103, resulting in local overheating or performance degradation. By increasing the area of the tab 103, the current can be more evenly distributed on the tab 103, thereby reducing the risk of local overheating and improving the performance and safety of the battery 2.

[0101] In the design of the battery 2 in the related art, there may be an interference phenomenon between two adjacent tabs 103, that is, the end of one tab 103 may contact or approach some parts of another tab 103, resulting in current short - circuit or assembly difficulties. By gradually reducing the width of the tab 103 along the direction of the tab body 102 towards the tab 103, the interference risk at the ends of two adjacent tabs 103 can be reduced. This design makes it easier to position the tab 103 during the assembly process, increases the creepage distance, reduces the assembly difficulty and improves the assembly efficiency.

[0102] As Figure 8 shown, in some embodiments of the present application, the electrode assembly 10 includes an insulating layer 110. The insulating layer 110 is wrapped around the outside of the tab body 102, and a plurality of through - holes are provided at the positions corresponding to the tabs 103 on the insulating layer 110, and the tabs 103 protrude from the through - holes. Optionally, the insulating layer 110 may be an insulating film layer supported by an organic material.

[0103] In the above structure, the insulating layer 110 is wrapped around the outside of the tab body 102, which can effectively isolate the tab body 102 from the battery housing 40 or other metal components that may come into contact with it. The insulation performance of the battery cell 7 is improved, and the safety risk caused by short - circuit is reduced. By providing the insulating layer 110, the insulation performance between the electrode assembly 10 and the housing 40 is improved. By providing through - holes in the insulating layer 110 to allow only the tabs 103 to pass through, the convenience of connecting the tabs 103 to the end cap 30 can be improved, and at the same time, the risk of the tabs 103 folding and being inserted reversely into the tab body 102 is reduced, and the operation stability of the battery cell 7 is improved.

[0104] As Figure 9As shown, in some embodiments of the present application, the electrode tab 101 includes a first tab 111 and a second tab 112 with opposite polarities. The first tab 111 includes two first tab ears 113, and the second tab 112 includes two second tab ears 114. The orthographic projection of the first tab ear 113 on the outer shell 40 is staggeredly arranged with the orthographic projection of the second tab ear 114 on the outer shell 40.

[0105] In the above structure, the staggered arrangement of the tab ears 103 with different polarities can reduce the direct physical contact between the tab ears 103, thereby reducing the risk of short circuit. When the tab ears 103 of the cathode tab and the anode tab overlap or are too close, a direct current path is easily formed between the tab ears 103, that is, a short circuit. A short circuit will cause the internal heat of the battery 2 to rise sharply, which may lead to thermal runaway of the battery 2 and even explosion or fire.

[0106] By staggeredly arranging the tab ears 103 of the cathode tab and the anode tab, this short - circuit risk can be significantly reduced. Even under extreme conditions such as high current or vibration, the safe distance between the tab ears 103 can be maintained, ensuring the stable operation of the battery 2.

[0107] As Figure 4 shown, in some embodiments of the present application, the outer shell 40 includes a housing 20 and two end caps 30. The housing 20 has two openings oppositely arranged along the second direction Y, and the two end caps 30 are respectively covered on the two openings. At least two electrode terminals 25 are provided on each end cap 30, and the two electrode terminals 25 are electrically connected to the first tab ear 113 and the second tab ear 114 respectively.

[0108] In the above structure, by respectively arranging the electrode terminals 25 on the two end caps 30, the connection path between the battery 2 and the outside is increased. This helps to disperse the current, reduce the current density of a single path, and thus improve the over - current capacity of the battery 2. The improvement of the over - current capacity means that the battery 2 can withstand a greater current load and meet the application requirements of higher power. Increasing the path between the electrode assembly 10 and the outside not only improves the over - current capacity of the battery 2, but also helps to reduce the internal resistance and heat accumulation of the battery 2. This helps to improve the efficiency, cycle life and safety of the battery 2.

[0109] In some embodiments of the present application, the outer shell 40 further includes two pressure - relief mechanisms 24, and the two pressure - relief mechanisms 24 are respectively arranged on the two end caps 30. The main function of the pressure - relief mechanism 24 is that when the internal pressure of the battery cell 7 is higher than the threshold value, it can be automatically or manually opened to release the internal gas, thereby reducing the accumulation of gas in the outer shell 40 and avoiding the explosion of the battery cell 7 due to excessive internal pressure.

[0110] In the above technical solution, by providing two pressure relief mechanisms 24, the battery 2 can exhaust gas from two directions, which greatly increases the exhaust efficiency and safety. Compared with a single pressure relief mechanism 24, two-way exhaust can more quickly reduce the internal pressure and reduce the risks caused by poor exhaust. When the pressure inside the battery 2 abnormally increases due to overcharging, over-discharging, short-circuiting, etc., the two pressure relief mechanisms 24 can timely release the internal gas, thereby significantly reducing the risk of explosion of the battery cell 7 and effectively improving the operating stability of the battery cell 7.

[0111] In some alternative embodiments, the pressure relief thresholds of the two pressure relief mechanisms 24 can be differentially set. The pressure relief mechanism 24 with a higher threshold is arranged on the upper side in the height direction, and the pressure relief mechanism 24 with a lower threshold is arranged on the lower side in the height direction. Exemplarily, when the battery cell 7 is arranged at the bottom of the vehicle 1, the pressure relief mechanism 24 on the lower side will open the valve prior to the pressure relief mechanism 24 on the upper side, reducing the risk of the pressure relief mechanism 24 opening the valve towards the vehicle floor 401 and causing harm to the people inside the vehicle.

[0112] As Figure 10 shown, in some embodiments of the present application, the first electrode tab 111 further includes a first electrode tab body 116 and two third electrode tabs 117. The two first electrode tabs 113 are respectively connected to both sides of the first electrode tab body 116 along the second direction Y, and the two third electrode tabs 117 are respectively connected to one side of the first electrode tab body 116 along the third direction Z, and the third direction Z intersects the plane where the first direction X and the second direction Y are located.

[0113] In the above structure, by providing the third electrode tabs 117, the number of electrode tabs 103 is further increased, the electric field is made uniform in four directions and the heat accumulation is dispersed, improving the operating stability of the battery cell 7.

[0114] As Figure 11 shown, in some embodiments of the present application, the housing 40 includes a bottom plate 401, a top plate (not shown in the figure), and side plates 402. The top plate is disposed opposite to the bottom plate 401, and the side plates 402 are disposed between the bottom plate 401 and the top plate. The number of the side plates 402 is four, and the four side plates 402 are connected end to end in sequence. Two electrode terminals 25 are respectively provided on each side plate 402.

[0115] In the above structure, the bottom plate 401 and the top plate are disposed opposite to each other, and the four side plates 402 are located between them and are connected end to end in sequence, forming a closed and stable structural space. This design ensures the stability and safety of the internal components of the battery 2 and reduces the damage caused by external impact or vibration. This structural space provides a stable and safe operating environment for the electrode assembly 10. The electrode assembly 10 can work stably in this space without being affected by the external environment.

[0116] Two electrode terminals 25 are provided on each side plate 402, and these electrode terminals 25 are used for the connection between battery cells 7 or for connection to external devices. This design makes the connection of battery 2 convenient and flexible, and allows selection of which side plates 402 to connect according to needs.

[0117] In some embodiments of the present application, the housing 40 further includes a connecting piece 403, which is provided on the side of the side plate 402 facing the accommodating cavity. One side of the connecting piece 403 is electrically connected to the tab 103. The electrode terminal 25 includes a pole column and a connecting plate 404, and a pole column hole is provided on the side plate 402. The pole column passes through the pole column hole and is connected to the side plate 402, and one end of the pole column is connected to the side of the connecting piece 403 facing away from the tab 103. The connecting plate 404 is provided on the side of the side plate 402 facing away from the accommodating cavity and is connected to the pole column.

[0118] The connecting piece 403 is arranged on the side of the side plate 402 facing the accommodating cavity, and is used to connect a plurality of tabs 103 (usually tabs 103 of the same polarity). Through the connecting piece 403, the electrical signals of a plurality of tabs 103 can be aggregated and transmitted to the electrode terminal 25, realizing the connection between the battery cell 7 and the external circuit.

[0119] Optionally, the connecting plate 404 is generally designed to have a flat and easily connectable structure, which can facilitate docking and fixing with the interfaces of other components. Or the connecting plate 404 can be customized according to specific requirements to adapt to different connection methods and interface standards, improving the versatility and flexibility of the battery cell 7.

[0120] In addition, the materials of the connecting piece 403 and the electrode terminal 25 generally have good electrical conductivity and corrosion resistance, which can ensure the stable performance of the battery cell 7 during long-term use.

[0121] The above structure not only simplifies the circuit structure inside the battery cell 7, but also improves the stability and reliability of the connection between the battery cell 7 and the external circuit. The provision of the connecting plate 404 makes the assembly of the battery cell 7 with other components more convenient. Through the design of the connecting piece 403 and the electrode terminal 25, the electrical energy inside the battery cell 7 can be safely and stably exported to the external circuit. The connection between the connecting piece 403 and the electrode terminal 25 is firm and reliable, and can withstand a certain amount of mechanical vibration and shock.

[0122] In some optional embodiments, the electrode assembly 10 is a stacked assembly, and a plurality of electrode plates 101 are stacked along the first direction X. At least four tabs 103 are provided on each electrode plate, and the four tabs 103 are respectively arranged at the four edges of the electrode plate.

[0123] In some optional embodiments, the electrode assembly 10 is a winding assembly, and a plurality of electrode plates 101 stacked on top of each other are simultaneously wound and formed around the second direction Y. On each turn of the electrode plate 101, at least four tabs 103 are provided. The four tabs 103 are divided into two groups, with two tabs 103 in each group. The two groups of tabs 103 are respectively arranged at both ends of the plate body 102 along the second direction Y.

[0124] In some embodiments of the present application, the battery cell 7 includes a housing 40 and an electrode assembly 10. The housing 40 has a receiving cavity, and the electrode assembly 10 is disposed in the receiving cavity. The electrode assembly 10 includes a plurality of electrode plates 101 stacked along the first direction X. The electrode plate 101 includes a plate body 102 and a tab 103. The number of tabs 103 in each electrode plate 101 is at least two, and the two tabs 103 are respectively connected to both sides of the plate body 102 along the second direction Y, and the second direction Y intersects with the first direction X. The extension length of the plate body 102 along the second direction Y is L1, and the extension width of the plate body 102 along the third direction Z is W1. The third direction Z intersects with the plane where the first direction X and the second direction Y are located, and L1 and W1 satisfy the relationship W1 ≤ L1. The plate body 102 includes a current collector 105, an active material layer 106, and a highly conductive layer 107. Along the direction of the plate body 102 facing the tab 103, the width of the tab 103 gradually decreases. The current collector 105 is connected to the tab 103, and the active material layer 106 is disposed on at least one surface of the current collector 105. The electrode assembly 10 includes an insulating layer 110. The insulating layer 110 is wrapped around the outside of the plate body 102, and a plurality of through holes are provided in the insulating layer 110 at positions corresponding to the tabs 103, and the tabs 103 protrude from the through holes. The electrode plate 101 includes a first plate 111 and a second plate 112 with opposite polarities. The first plate 111 includes two first tabs 113, and the second plate 112 includes two second tabs 114. The orthographic projection of the first tab 113 on the housing 40 and the orthographic projection of the second tab 114 on the housing 40 are staggered. The housing 40 includes a housing body 20 and two end caps 30. The housing body 20 has two openings oppositely arranged along the second direction Y, and the two end caps 30 are respectively covered on the two openings. At least two electrode terminals 25 are provided on each end cap 30, and the two electrode terminals 25 are respectively electrically connected to the first tab 113 and the second tab 114. The housing 40 further includes two pressure relief mechanisms 24, and the two pressure relief mechanisms 24 are respectively disposed on the two end caps 30.

[0125] An embodiment of the present application provides an electrode assembly 10, which includes a plurality of electrode tabs 101 stacked along a first direction X. The electrode tab 101 includes a tab body 102 and a tab ear 103. The number of tab ears 103 in each electrode tab 101 is at least two. The two tab ears 103 are respectively connected to both sides of the tab body 102 along a second direction Y, and the second direction Y intersects the first direction X.

[0126] In the above structure, the number of tab ears 103 in the tab is increased, which reduces the local lithium plating phenomenon of the tab caused by uneven distribution of electric field and heat during operation, and at the same time improves the over-current capacity of the electrode assembly 10, making the battery 2 more stable during high-current discharge or charging. The two tab ears 103 are respectively arranged on opposite sides of the tab body 102, shortening the longest distance from the active material to the tab ear 103. The current transmission path on the tab is shorter and the resistance is smaller. The local polarization and lithium plating phenomena of the tab are reduced, and at the same time the local heat accumulation is reduced, because the current distribution is more uniform, and the local overheating caused by excessive current is reduced. Therefore, the above structure improves the stability of the battery cell 7 during operation, making the battery 2 maintain better performance during long-term use.

[0127] An embodiment of the present application provides a battery 2, which includes the battery cell 7 in the above embodiment or the electrode assembly 10 in the above embodiment. An embodiment of the present application also provides an electrical device, which includes the battery 2 in the above embodiment, and the battery 2 is used to provide electrical energy. The battery 2 and the electrode assembly 10 in the embodiments of the present application both include the electrode assembly 10 in the above embodiment, so they also have the above technical effects and will not be elaborated here.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell (7), characterized in that: include: A housing (40) having a receiving cavity; An electrode assembly (10) is arranged in the accommodating cavity, the electrode assembly (10) comprising a plurality of electrode plates (101) stacked along a first direction (X), the electrode plates (101) comprising a plate body (102) and a pole ear (103), the number of the pole ears (103) in each of the electrode plates (101) being at least two, the two pole ears (103) being respectively connected to two sides of the plate body (102) along a second direction (Y), and the second direction (Y) intersects with the first direction (X).

2. The battery cell (7) according to claim 1, characterized in that: The extension length of the pole piece body (102) along the second direction (Y) is L1, and the extension width of the pole piece body (102) along the third direction (Z) is W1. The third direction (Z) intersects with the planes where the first direction (X) and the second direction (Y) are located. L1 and W1 satisfy the relationship: W1≤L1.

3. The battery cell (7) according to claim 1, characterized in that: The pole piece body (102) comprises: A current collector (105) connected to the tab (103); An active material layer (106) is provided on at least one surface of the current collector (105); The high-conductivity layer (107) is disposed between the current collector (105) and the active material layer (106), and the orthographic projection of the high-conductivity layer (107) on the current collector (105) is located in a region of the current collector (105) close to the electrode tab (103).

4. The battery cell (7) according to claim 1, characterized in that: Along the direction from the pole piece body (102) to the pole ear (103), the width of the pole ear (103) gradually decreases.

5. The battery cell (7) according to claim 1, characterized in that: The electrode assembly (10) comprises an insulating layer (110), the insulating layer (110) is wrapped around the outer side of the pole piece body (102), a plurality of through holes are provided on the insulating layer (110) at positions corresponding to the pole ears (103), and the pole ears (103) extend out of the through holes.

6. The battery cell (7) according to any one of claims 1 to 5, characterized in that: The electrode plate (101) comprises a first plate (111) and a second plate (112) of opposite polarities, the first plate (111) comprising two first pole ears (113), the second plate (112) comprising two second pole ears (114), and the orthographic projection of the first pole ears (113) on the housing (40) and the orthographic projection of the second pole ears (114) on the housing (40) are arranged alternately.

7. The battery cell (7) according to claim 6, characterized in that: The housing (40) comprises: A housing (20) having two openings arranged opposite to each other along the second direction (Y); Two end covers (30) are respectively covered on the two openings, and each end cover (30) is provided with at least two electrode terminals (25), and the two electrode terminals (25) are respectively electrically connected to the first electrode tab (113) and the second electrode tab (114).

8. The battery cell (7) according to claim 7, characterized in that: The housing (40) further comprises two pressure relief mechanisms (24), and the two pressure relief mechanisms (24) are respectively arranged on the two end covers (30).

9. The battery cell (7) according to claim 6, characterized in that: The first pole piece (111) further comprises: A first pole piece body (116), wherein the two first pole ears (113) are respectively connected to two sides of the first pole piece body (116) along the second direction (Y); Two third pole ears (117) are respectively connected to one side of the first pole piece body (116) along a third direction (Z), and the third direction (Z) intersects with the plane where the first direction (X) and the second direction (Y) are located.

10. The battery cell (7) according to claim 9, characterized in that: The housing (40) comprises: Bottom plate (401); A top plate, arranged opposite to the bottom plate (401); A side plate (402) is arranged between the bottom plate (401) and the top plate. There are four side plates (402). The four side plates (402) are connected end to end in sequence. Two electrode terminals (25) are respectively arranged on each side plate (402).

11. The battery cell (7) according to claim 10, characterized in that: The housing (40) further comprises a transfer plate (403), wherein the transfer plate (403) is arranged on a side of the side plate (402) facing the accommodating cavity, and one side of the transfer plate (403) is electrically connected to the tab (103). The electrode terminal (25) comprises a pole and a connecting plate (404); a pole hole is provided on the side plate (402); the pole passes through the pole hole and is connected to the side plate (402); one end of the pole is connected to a side of the adapter plate (403) away from the pole ear (103); and the connecting plate (404) is provided on a side of the side plate (402) away from the accommodating cavity and is connected to the pole.

12. An electrode assembly (10), characterized in that: The invention comprises a plurality of electrode plates (101) stacked along a first direction (X), wherein the electrode plates (101) comprise a plate body (102) and a pole ear (103), wherein the number of the pole ears (103) in each of the electrode plates (101) is at least two, and the two pole ears (103) are respectively connected to two sides of the plate body (102) along a second direction (Y), and the second direction (Y) intersects with the first direction (X).

13. A battery (2), characterized in that: The method comprises a battery cell (7) as claimed in any one of claims 1 to 11, or an electrode assembly (10) as claimed in claim 12.

14. An electrical device, characterized in that: The electrical device comprises the battery (2) as claimed in claim 13, and the battery (2) is used to provide electrical energy.

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