Battery monomer, battery and electric equipment

Abstract

The utility model discloses a battery monomer, a battery and electric equipment, the battery monomer comprises a shell, an electrode terminal and an electrode assembly, the electrode terminal is arranged on the shell and is insulated from the shell, the electrode assembly is accommodated in the shell, the electrode assembly comprises a first tab and a second tab, the polarity of the first tab is opposite to that of the second tab, and the first tab and the second tab are arranged on the shell. The first tab is electrically connected with the electrode terminal, and the second tab is electrically connected with the shell. According to the battery monomer provided by the invention, an insulating part does not need to be additionally arranged between the electrode assembly and the shell, and only one electrode terminal can be arranged, so that the number of the electrode terminals is reduced, and the number of insulating parts and sealing parts arranged between the electrode terminals and the shell is also reduced; therefore, the number of parts of the single battery is effectively reduced, the size and the weight of the single battery are effectively reduced, and the energy density of the single battery is effectively improved.

Description

Technical Field

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

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

[0003] A battery usually includes a plurality of battery cells. Since a battery cell has a large number of components, the volume and weight of the battery cell increase, resulting in a decrease in the energy density of the battery cell, and thus a decrease in the energy density of the battery. Utility Model Content

[0004] One of the purposes of the embodiments of the present application is to provide a battery cell, a battery and an electrical device, aiming to solve the technical problem in the related art that the energy density of the battery cell decreases due to the large number of components in the battery cell.

[0005] In order to solve the above technical problems, the technical solution adopted in the embodiment of the present application is:

[0006] In a first aspect, a battery cell is provided, comprising:

[0007] shell;

[0008] The electrode terminal is arranged on the shell and insulated from the shell;

[0009] The electrode assembly is accommodated in the shell, and includes a first pole ear and a second pole ear. The polarity of the first pole ear is opposite to that of the second pole ear. The first pole ear is electrically connected to the electrode terminal, and the second pole ear is electrically connected to the shell.

[0010] The beneficial effect of the battery cell provided by the embodiment of the present application is that the battery cell provided by the embodiment of the present application insulates the electrode terminal from the shell, and electrically connects the first pole ear to the electrode terminal, and electrically connects the second pole ear to the shell. In other words, the electrode terminal can be used as one of the positive output pole and the negative output pole of the battery cell, and the shell can be used as the other of the positive output pole and the negative output pole of the battery cell. In this way, there is no need to additionally set an insulating component between the electrode assembly and the shell, and only one electrode terminal can be set, which not only reduces the number of electrode terminals, but also reduces the number of insulating components and sealing components set between the electrode terminal and the shell, thereby effectively reducing the number of components of the battery cell, effectively reducing the volume and weight of the battery cell, and then effectively improving the energy density of the battery cell.

[0011] In some embodiments of the present application, the housing includes a first wall, the electrode terminal is disposed on the first wall and insulated from the first wall, and the second electrode tab is connected to the first wall.

[0012] By adopting the above-mentioned technical solution, the first pole ear and the second pole ear can be led out on the side of the electrode assembly facing the first wall, and the first pole ear and the second pole ear can be electrically connected to the electrode terminal and the first wall respectively, so that the first pole ear and the second pole ear can share a lead-out space, thereby optimizing the internal spatial layout structure of the battery cell and making the structure of the battery cell more compact, thereby effectively reducing the volume of the battery cell and effectively improving the volume energy density of the battery cell.

[0013] In some embodiments of the present application, the first wall includes a wall body and a first boss, the electrode terminal is arranged on the wall body and is used to be electrically connected to a bus bar, and the first boss is protruding from the surface of the wall body facing away from the electrode assembly and is used to be electrically connected to another bus bar.

[0014] By adopting the above technical solution, the difference between the connection height of one busbar and the electrode terminal and the connection height of another busbar and the first wall can be reduced, which facilitates the connection equipment to electrically connect the battery cell and the busbar.

[0015] In some embodiments of the present application, the first boss has a first connection surface for connecting to the bus bar, the electrode terminal has a second connection surface for connecting to the bus bar, and the height of the first connection surface is equal to the height of the second connection surface.

[0016] By adopting the above technical solution, electrical connection operations can be performed between the busbar and the electrode terminal and between the busbar and the first boss at the same height, which facilitates the connection equipment to perform electrical connection operations between the battery cell and the busbar.

[0017] In some embodiments of the present application, the battery cell further includes a first adapter and a second adapter, the first adapter is connected between the electrode terminal and the first pole lug, and the second adapter is connected between the first wall and the second pole lug.

[0018] By adopting the above technical solution, it is convenient to electrically connect the electrode terminal to the first electrode tab and to electrically connect the first wall to the second electrode tab.

[0019] In some embodiments of the present application, the first adapter has a third connection surface for connecting to the first pole lug, the second adapter has a fourth connection surface for connecting to the second pole lug, and the height of the third connection surface is equal to the height of the fourth connection surface.

[0020] By adopting the above technical solution, electrical connection operations can be performed between the first adapter and the first pole lug and between the second adapter and the second pole lug at the same height, which facilitates the connection device to electrically connect the electrode assembly to the electrode terminal and the shell.

[0021] In some embodiments of the present application, the first wall includes a wall body and a second boss, the electrode terminal is arranged on the wall body, the second boss is protruding from the surface of the wall body facing the electrode assembly, and the second electrode ear is connected to the second boss.

[0022] By adopting the above technical solution, the difference between the connection height between the second pole tab and the first wall and the connection height between the first pole tab and the electrode terminal can be reduced, which facilitates the connection device to electrically connect the first wall and the second pole tab.

[0023] In some embodiments of the present application, the battery cell also includes a first adapter, which is connected between the electrode terminal and the first pole ear, and the first adapter has a third connecting surface for connecting to the first pole ear, and the second boss has a fifth connecting surface for connecting to the second pole ear, and the height of the third connecting surface is equal to the height of the fifth connecting surface.

[0024] By adopting the above technical solution, electrical connection operations can be performed between the first adapter and the first pole ear and between the second boss and the second pole ear at the same height position, which facilitates the connection device to electrically connect the electrode assembly to the electrode terminal and the shell.

[0025] In some embodiments of the present application, the second boss has a fifth connection surface for connecting to the second electrode tab, the electrode terminal has a sixth connection surface for connecting to the first electrode tab, and the height of the fifth connection surface is equal to the height of the sixth connection surface.

[0026] By adopting the above technical solution, electrical connection operations can be performed between the electrode terminal and the first pole ear and between the second boss and the second pole ear at the same height position, which facilitates the connection device to electrically connect the electrode assembly to the electrode terminal and the shell.

[0027] In some embodiments of the present application, the housing includes a first wall and a second wall, the electrode terminal is disposed on the first wall and insulated from the first wall, and the second electrode tab is connected to the second wall.

[0028] By adopting the above technical solution, it is convenient to electrically connect the second electrode tab to the shell.

[0029] In some embodiments of the present application, a through hole is formed in the second wall, the through hole connects the internal environment of the shell and the external environment of the shell, and the second electrode ear is passed through the through hole and connected to the second wall.

[0030] By adopting the above technical solution, the second pole tab and the second wall can be electrically connected outside the shell, which is convenient for electrically connecting the second pole tab to the second wall, thereby effectively improving the assembly efficiency of the battery cell.

[0031] In some embodiments of the present application, the battery cell further includes a sealing cover, which is disposed on the through hole and cooperates with the second wall to clamp the second pole ear.

[0032] By adopting the above technical solution, not only can the second pole ear be shaped so that the second pole ear can be close to the second wall, thereby reducing the risk of the second pole ear detaching from the second wall, but the second pole ear can also be effectively protected, thereby reducing the risk of damage to the second pole ear.

[0033] In some embodiments of the present application, a surface of the cover facing away from the electrode assembly is flush with a surface of the second wall facing away from the electrode assembly.

[0034] By adopting the above technical solution, the outer surface of the battery cell can be made flatter, so that the battery cells can be neatly arranged inside the battery.

[0035] In some embodiments of the present application, the battery cell further includes a positioning member disposed on the second wall, and the positioning member is used to limit the position of the second pole lug so that the second pole lug contacts the second wall.

[0036] By adopting the above technical solution, after the positioning member and the electrode assembly are placed in the shell, the position of the second pole ear can be limited by the positioning member so that the second pole ear contacts the second wall, which facilitates the electrical connection of the second pole ear to the second wall, thereby effectively improving the assembly efficiency of the battery cell.

[0037] In some embodiments of the present application, the positioning member is provided with a positioning hole, and the second pole ear is passed through the positioning hole so that the second pole ear contacts the second wall.

[0038] By adopting the above technical solution, the second pole ear can be effectively positioned.

[0039] In some embodiments of the present application, the first wall is arranged opposite to the second wall, and the electrode assembly further includes an electrode body, the first electrode ear is connected to the side of the electrode body facing the first wall, and the second electrode ear is connected to the side of the electrode body facing the second wall.

[0040] By adopting the above technical solution, it is convenient to electrically connect the first electrode tab and the second electrode tab to the electrode terminal and the shell respectively.

[0041] In some embodiments of the present application, the housing includes a shell and a cover body disposed on the shell, and the first wall constitutes the cover body.

[0042] By adopting the above technical solution,

[0043] In some embodiments of the present application, the battery cell further includes an insulating layer, which is coated on the outer surface of the shell.

[0044] By adopting the above technical solution, two adjacent battery cells in the battery are effectively insulated and separated, thereby reducing the risk of short circuit in the battery and effectively improving the safety performance of the battery.

[0045] In some embodiments of the present application, the battery cell is a sodium ion battery cell.

[0046] By adopting the above technical solution, not only the production cost of battery cells is effectively reduced, but also the energy density of battery cells can be further improved.

[0047] In some embodiments of the present application, the shell is one of an aluminum shell, a steel shell and a copper shell.

[0048] By adopting the above technical solution, the risk of electrochemical corrosion of the shell is effectively reduced, thereby effectively improving the reliability of the battery cell.

[0049] In a second aspect, an embodiment of the present application further provides a battery, comprising the battery cell described in any of the above embodiments.

[0050] The beneficial effect of the battery provided by the embodiment of the present application is that the battery provided by the embodiment of the present application adopts the battery cell described in any of the above embodiments, thereby effectively improving the energy density of the battery.

[0051] In some embodiments of the present application, the battery further includes a busbar, the number of battery cells is multiple, and the busbar is electrically connected between an electrode terminal of one battery cell and a housing of another battery cell.

[0052] By adopting the above technical solution, it is convenient to electrically connect the battery cells in the battery.

[0053] In some embodiments of the present application, the busbar is connected between the electrode terminal of one battery cell and the bottom wall of the housing of another battery cell; or,

[0054] The busbar is connected between the electrode terminal of one battery cell and the side wall of the housing of another battery cell.

[0055] By adopting the above technical solution,

[0056] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the battery described in any of the above embodiments.

[0057] The beneficial effect of the electric device provided by the embodiment of the present application is that the electric device provided by the embodiment of the present application adopts the battery described in any of the above embodiments, thereby effectively improving the battery life performance of the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0059] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0060] Figure 2 An exploded schematic diagram of a battery provided in an embodiment of the present application;

[0061] Figure 3 A schematic diagram of the connection structure of two adjacent battery cells in a battery provided in an embodiment of the present application;

[0062] Figure 4 A schematic diagram of the connection structure of two adjacent battery cells in a battery provided in another embodiment of the present application;

[0063] Figure 5 A schematic diagram of the connection structure of two adjacent battery cells in a battery provided in another embodiment of the present application;

[0064] Figure 6 A schematic diagram of the structure of a battery cell provided in one embodiment of the present application;

[0065] Figure 7 for Figure 6 A schematic diagram of the top view of the battery cell shown;

[0066] Figure 8 for Figure 7 The schematic cross-sectional structure diagram of the battery cell shown along the AA line;

[0067] Fig. 9 for Figure 8 The enlarged structural diagram of the battery cell at position B is shown;

[0068] Fig.10 for Figure 8 The enlarged structural diagram of the battery cell at position C is shown;

[0069] Fig.11 A schematic diagram of the structure of a battery cell provided in another embodiment of the present application;

[0070] Fig.12 for Fig.11 A schematic diagram of the top view of the battery cell shown;

[0071] Fig.13 for Fig.12 The cross-sectional structure diagram of the battery cell shown along the DD line;

[0072] Fig.14 for Fig.13 The enlarged structural diagram of the battery cell at position E is shown;

[0073] Fig.15 for Fig.13 The enlarged structural diagram of the battery cell at F is shown;

[0074] Fig.16 A schematic diagram of the structure of a battery cell provided in another embodiment of the present application;

[0075] Fig.17 for Fig.16 The exploded structure diagram of the battery cell shown;

[0076] Fig.18 for Fig.16 A schematic diagram of the top view of the battery cell shown;

[0077] Fig.19 for Fig.18 The schematic cross-sectional structure diagram of the battery cell shown along the GG line;

[0078] Fig. 20 for Fig.19 The enlarged structural diagram of the battery cell at H is shown;

[0079] Fig.21 A schematic diagram of the structure of a battery cell provided in yet another embodiment of the present application;

[0080] Fig. 22 for Fig.21 Schematic diagram of the exploded structure of a battery cell is shown.

[0081] Description of reference numerals:

[0082] 1000. Vehicles;

[0083] 100. Battery;

[0084] 10. Box body; 11. First part; 12. Second part;

[0085] 20. Battery cell; 21. Shell; 211. Shell; 2111. Second wall; 21111. Through hole; 212. Cover; 213. First wall; 2131. Wall; 2132. First boss; 21321. First connection surface; 2133. Second boss; 21331. Fifth connection surface; 22. Electrode terminal; 221. Second connection surface; 23. Electrode assembly; 231. Electrode body; 232. First pole ear; 233. Second pole ear; 24. First adapter; 241. Third connection surface; 25. Second adapter; 251. Fourth connection surface; 26. Cover; 27. Positioning member; 28. Pressure relief mechanism;

[0086] 30. Busbars;

[0087] 200, controller;

[0088] 300. Motor. DETAILED DESCRIPTION

[0089] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0090] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0091] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0092] In addition, the terms "first", "second", "third", "fourth", "fifth", and "sixth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third", "fourth", "fifth", and "sixth" may explicitly or implicitly include one or more of the feature. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0093] As the smallest unit of a battery, a battery cell generally includes a shell, an electrode assembly, an electrolyte, and two electrode terminals. The shell is used to provide an internal environment for the battery cell, which is used to accommodate the electrode assembly and the electrolyte. The two electrode terminals are arranged on the wall of the shell and insulated from the wall of the shell. The electrode assembly includes two tabs, one of which is electrically connected to one electrode terminal, and the other tab is electrically connected to the other electrode terminal, so as to output or input the electrical energy of the battery cell.

[0094] In the related art, in order to improve the safety performance of battery cells, it is usually necessary to set insulating components between the electrode terminals and the outer shell and between the electrode assembly and the outer shell, so that the electrode terminals and the outer shell are insulated and separated, and the electrode assembly and the outer shell are insulated and separated. At the same time, in order to reduce the risk of electrolyte leakage, it is usually necessary to set a sealing component between the electrode terminals and the outer shell to close the gap between the electrode terminals and the outer shell. In this way, the number of parts of the battery cell is large, which increases the volume and weight of the battery cell, resulting in a decrease in the energy density of the battery cell, and then the energy density of the battery is also reduced.

[0095] In order to improve the energy density of the battery cell, in the battery cell provided in the embodiment of the present application, the electrode terminal is insulated from the shell, the first pole ear is electrically connected to the electrode terminal, and the second pole ear is electrically connected to the shell. In other words, the electrode terminal can serve as one of the positive output electrode and the negative output electrode of the battery cell, and the shell can serve as the other of the positive output electrode and the negative output electrode of the battery cell. In this way, there is no need to additionally set an insulating component between the electrode assembly and the shell, and only one electrode terminal can be set, which not only reduces the number of electrode terminals, but also reduces the number of insulating components and sealing components set between the electrode terminal and the shell, thereby effectively reducing the number of components of the battery cell, effectively reducing the volume and weight of the battery cell, and thus effectively improving the energy density of the battery cell.

[0096] The battery disclosed in the embodiment of the present application can be used for electrical equipment using the battery as a power source, or for various energy storage systems using the battery as an energy storage element. Electrical equipment can be, but is not limited to, vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. The spacecraft can be an airplane, a rocket, a space shuttle, or a spacecraft, etc. The electric toy can be a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The electric tool can be a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc.

[0097] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0098] See also Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided in an embodiment of the present application. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating, and driving the vehicle 1000.

[0099] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0100] See also Figure 2 , Figure 2Schematic diagram of an explosion of a battery 100 provided in an embodiment of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure, and the first part 11 is covered on the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 is covered on the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0101] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10. Of course, the battery 100 may also be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the box 10.

[0102] Each battery cell 20 may be a secondary battery cell or a primary battery cell, wherein a secondary battery cell refers to a battery cell 20 that can be used continuously by activating active materials by charging after the battery cell 20 is discharged, and a primary battery cell refers to a battery cell 20 that cannot be used continuously by activating active materials by charging after the power of the battery cell 20 is exhausted; the battery cell 20 may also be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead storage battery cell, etc., but is not limited thereto. The battery cell 20 may be a cylindrical battery cell, a prismatic battery cell, a soft pack battery cell, or a battery cell 20 of other shapes, wherein the prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, and the multi-prismatic battery cell is, for example, a hexagonal battery cell, etc., and the present application has no particular restrictions.

[0103] Of course, in some embodiments, the battery 100 may not include the housing 10 , but rather a plurality of battery cells 20 may be electrically connected and formed into a whole through necessary fixing structures and then assembled into the vehicle 1000 .

[0104] In order to illustrate the technical solution provided by the present application, a detailed description is given below in conjunction with specific drawings and embodiments.

[0105] First, please also refer to Figures 6 to 22 The embodiment of the present application provides a battery cell 20, including a shell 21, an electrode terminal 22 and an electrode assembly 23, wherein the electrode terminal 22 is arranged on the shell 21 and is insulated from the shell 21, and the electrode assembly 23 is accommodated in the shell 21, and the electrode assembly 23 includes a first pole ear 232 and a second pole ear 233, wherein the polarity of the first pole ear 232 is opposite to that of the second pole ear 233, the first pole ear 232 is electrically connected to the electrode terminal 22, and the second pole ear 233 is electrically connected to the shell 21.

[0106] The shell 21 is used to provide an internal environment for the battery cell 20, and the internal environment can be used to accommodate the electrode assembly 23, electrolyte and other components. At least the portion of the shell 21 electrically connected to the second electrode tab 233 is made of a conductive material, and the conductive material can be but is not limited to aluminum, steel, copper, etc. In some embodiments, the entire shell 21 is made of a conductive material. In other words, the shell 21 can be but is not limited to an aluminum shell, a steel shell, a copper shell, etc.

[0107] In some embodiments, the housing 21 includes a shell 211 and a cover 212. The above-mentioned internal environment is formed inside the shell 211, and the shell 211 may be an independent component, and an opening may be provided on the shell 211. The cover 212 is provided at the opening of the shell 211 to isolate the internal environment of the battery cell 20 from the external environment. Specifically, the shell 211 and the cover 212 may form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 211, the cover 212 is provided on the opening of the shell 211. Optionally, the shell 211 may be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. The shape of the cover 212 may be adapted to the shape of the shell 211 to match the shell 211.

[0108] The electrode terminal 22 is a component electrically connected to the electrode assembly 23 for outputting or inputting electric energy. In some embodiments, an electrode lead-out hole is provided on the housing 21, and the motor lead-out hole can be provided on the cover 212 or on the housing 211. The electrode terminal 22 is arranged in the electrode lead-out hole. A part of the electrode terminal 22 protrudes into the internal environment of the battery cell 20 and is directly or indirectly connected to the electrode assembly 23. Another part of the electrode terminal 22 protrudes into the external environment of the battery cell 20 and is connected to the busbar 30, the sampling device and other components. Optionally, the electrode terminal 22 can be a columnar structure, such as a cylindrical structure, a prismatic structure, etc., the electrode terminal 22 can also be a plate-like structure, such as a circular plate, a square plate, etc., and the electrode terminal 22 can also be other irregular three-dimensional structures, which are not specifically limited here. It can be understood that the electrode terminal 22 is made of a conductive material. The electrode terminal 22 can be made of one conductive material or a plurality of conductive materials. The conductive material can be, but is not limited to, copper, aluminum, nickel, zinc, iron, etc., which are not specifically limited here.

[0109] In some embodiments, the battery cell 20 further includes an insulating member disposed between the electrode terminal 22 and the housing 21 to insulate and separate the electrode terminal 22 from the housing 21 .

[0110] In some embodiments, the battery cell 20 further includes a sealant, which is disposed between the electrode terminal 22 and the hole wall of the electrode lead-out hole to seal the gap between the electrode terminal 22 and the hole wall of the electrode lead-out hole.

[0111] In some embodiments, the battery cell 20 further includes a pressure relief mechanism 28, which is a mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The pressure relief mechanism 28 can be installed on the cover 212 or on the housing 211.

[0112] The electrode assembly 23 is a component in the battery cell 20 where an electrochemical reaction occurs. The battery cell 20 may include one or more electrode assemblies 23. The electrode assembly 23 includes an electrode body 231, which is mainly made of a positive electrode sheet, a negative electrode sheet and a separator by a winding process or a stacking process. A plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately stacked. In some embodiments, a plurality of positive electrode sheets may be provided, and the negative electrode sheet is folded to form a plurality of folded sections arranged in a stacked manner, and a positive electrode sheet is sandwiched between two adjacent folded sections. In other embodiments, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections arranged in a stacked manner, and the folded sections of the positive electrode sheet and the folded sections of the negative electrode sheet are alternately stacked. In some embodiments, a plurality of separators may be provided, and each separator is respectively provided between any adjacent positive electrode sheets or negative electrode sheets. In other embodiments, the separator may be provided continuously and provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding. The shape of the electrode assembly 23 may be, but is not limited to, cylindrical, flat or multi-prism-shaped. During the charge and discharge process of the battery cell 20, active ions (such as lithium ions) are inserted and removed between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive electrode and the negative electrode from short-circuiting and allow the active ions to pass through.

[0113] The positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector. In some embodiments, the positive electrode current collector has two surfaces opposite to each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two opposite surfaces of the positive electrode current collector.

[0114] As an example, the positive electrode current collector may be a metal foil, a composite current collector or a foamed metal. For example, as a metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, may be used. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). The foamed metal may be a nickel foam, a copper foam, an aluminum foam, a foamed alloy, or a carbon foam, etc. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is a lithium metal and / or a lithium-rich material.

[0115] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for battery cells 2020 may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO 4 (also referred to as LFP), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 、LiMn 2 O 2 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O 2 (also referred to as NCM333), LiNi0.5Co0.2Mn0.3O 2 (also referred to as NCM523), LiNi0.5Co0.25Mn0.25O 2 (also referred to as NCM211), LiNi0.6Co0.2Mn0.2O 2 (also referred to as NCM622), LiNi0.8Co0.1Mn0.1O 2 (also referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi0.85Co0.15Al0.05O 2 ) and at least one of its modified compounds.

[0116] The negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector. In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0117] As an example, the negative electrode current collector can be a metal foil, a composite current collector or a foamed metal. For example, as a metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface can be used. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or a carbon foam, etc.

[0118] As an example, the negative electrode active material may adopt the negative electrode active material for the battery cell 20 known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for the battery cell 20 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0119] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0120] In some embodiments, the separator is a separator. The present application has no particular restrictions on the type of separator, and any known porous structure separator with good chemical stability and mechanical stability can be selected. For example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator can be a single-layer film or a multi-layer composite film. In the case where the separator is a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component arranged between the positive electrode sheet and the negative electrode sheet, or it can be attached to the surface of the positive electrode sheet and the surface of the negative electrode sheet.

[0121] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode sheet and the negative electrode sheet, and plays the role of transmitting ions and isolating the positive electrode sheet and the negative electrode sheet.

[0122] In some embodiments, the battery cell 20 also includes an electrolyte, which plays a role in conducting ions between the positive electrode sheet and the negative electrode sheet. The present application does not specifically limit the type of electrolyte, which can be selected according to needs. The electrolyte can be, but is not limited to, a liquid electrolyte, a gel electrolyte, a solid electrolyte, and the like. In the case where the electrolyte is a liquid electrolyte, an injection hole can be opened on the battery cell 20, and the injection hole connects the internal environment of the battery cell 20 and the external environment of the battery cell 20. The injection hole can be opened on the housing 21, for example, the injection hole is opened on the cover body 212, and for example, the injection hole is opened on the housing 211, and the injection hole can also be opened on the electrode terminal 22. After the battery cell 20 is assembled, the electrolyte can be input into the internal environment of the battery cell 20 through the injection hole.

[0123] The electrode assembly 23 also includes a tab, which can lead current from the electrode body 231. The tab includes a first tab 232 and a second tab 233. The polarity of the first tab 232 is opposite to the polarity of the second tab 233, that is, one of the first tab 232 and the second tab 233 is a positive tab, and the other of the first tab 232 and the second tab 233 is a negative tab. The first tab 232 can be directly or indirectly connected to the electrode terminal 22, and similarly, the second tab 233 can be directly or indirectly connected to the housing 21.

[0124] In some embodiments, the first pole ear 232 is a positive pole ear, and the first pole ear 232 is connected between the positive electrode sheet and the electrode terminal 22. The second pole ear 233 is a negative pole ear, and the second pole ear 233 is connected between the negative electrode sheet and the outer shell 21. The second pole ear 233 can be connected to the cover 212 or to the shell 211. In other words, in this embodiment, the electrode terminal 22 is used as the positive output electrode of the battery cell 20, and the outer shell 21 is used as the negative output electrode of the battery cell 20.

[0125] In other embodiments, the first pole ear 232 is a negative pole ear, and the first pole ear 232 is connected between the negative electrode sheet and the electrode terminal 22. The second pole ear 233 is a positive pole ear, and the second pole ear 233 is connected between the positive electrode sheet and the outer shell 21. The second pole ear 233 can be connected to the cover 212 or to the shell 211. In other words, in this embodiment, the electrode terminal 22 is used as the negative output electrode of the battery cell 20, and the outer shell 21 is used as the positive output electrode of the battery cell 20.

[0126] In some embodiments, the battery cell 20 is a sodium ion battery cell, and the shell 21 is an aluminum shell. Since sodium ions do not undergo electrochemical reactions with aluminum, the use of an aluminum shell as the shell 21 of the battery cell 20 can reduce the risk of corrosion of the shell 21 and effectively improve the performance of the battery cell 20. In addition, the sodium ion battery cell has a high energy density and abundant sodium reserves, which effectively reduces the production cost of the battery cell 20. In addition, the weight of the aluminum shell is relatively small, which can further improve the mass energy density of the battery cell 20, and the aluminum shell has good structural strength, which can effectively improve the structural strength of the battery cell 20.

[0127] The battery cell 20 provided in the embodiment of the present application is provided by insulating the electrode terminal 22 from the outer shell 21, and electrically connecting the first pole ear 232 to the electrode terminal 22, and electrically connecting the second pole ear 233 to the outer shell 21. In other words, the electrode terminal 22 can be used as one of the positive output electrode and the negative output electrode of the battery cell 20, and the outer shell 21 can be used as the other of the positive output electrode and the negative output electrode of the battery cell 20. In this way, there is no need to additionally set an insulating component between the electrode assembly 23 and the outer shell 21, and only one electrode terminal 22 can be set, which not only reduces the number of electrode terminals 22, but also reduces the number of insulating components and sealing components set between the electrode terminal 22 and the outer shell 21, thereby effectively reducing the number of components of the battery cell 20, effectively reducing the volume and weight of the battery cell 20, and then effectively improving the energy density of the battery cell 20.

[0128] In addition, since the battery cell 20 provided in the embodiment of the present application has a small number of parts, the production cost of the battery cell 20 is effectively reduced.

[0129] In some embodiments of this application, please refer to Figures 6 to 15 The housing 21 includes a first wall 213 , the electrode terminal 22 is disposed on the first wall 213 and insulated from the first wall 213 , and the second electrode tab 233 is electrically connected to the first wall 213 .

[0130] The first wall 213 may constitute the cover 212, or any wall of the housing 211. In some embodiments, the first wall 213 constitutes the cover 212. In other words, the electrode lead-out hole may be provided on the first wall 213 and the electrode terminal 22 may be disposed in the electrode lead-out hole. The second tab 233 is electrically connected to the first wall 213, that is, the first tab 232 and the second tab 233 are connected to the same side of the battery cell 20.

[0131] In some embodiments, the entire first wall 213 is made of conductive material, the electrode terminal 22 is insulated from the first wall 213 , and the second electrode tab 233 can be electrically connected to any part of the first wall 213 .

[0132] Of course, in other embodiments, only the first wall 213 and the second electrode tab 233 may be made of conductive material.

[0133] By adopting the above-mentioned technical solution, the first pole ear 232 and the second pole ear 233 can be led out on the side of the electrode assembly 23 facing the first wall 213, and the first pole ear 232 and the second pole ear 233 can be electrically connected to the electrode terminal 22 and the first wall 213, respectively, so that the first pole ear 232 and the second pole ear 233 can share a lead-out space, thereby optimizing the internal spatial layout structure of the battery cell 20 and making the structure of the battery cell 20 more compact, thereby effectively reducing the volume of the battery cell 20 and effectively improving the volume energy density of the battery cell 20.

[0134] In some embodiments of this application, please refer to Figures 6 to 15 The first wall 213 includes a wall body 2131 and a first boss 2132 , the electrode terminal 22 is arranged on the wall body 2131 and is used to be electrically connected to a bus 30 , and the first boss 2132 is protruded from the surface of the wall body 2131 facing away from the electrode assembly 23 and is used to be electrically connected to another bus 30 .

[0135] The wall body 2131 is the main part of the first wall 213. When the first wall 213 constitutes the cover body 212, the wall body 2131 covers the opening of the housing 211 to isolate the internal environment of the battery cell 20 from the external environment of the battery cell 20. In this embodiment, the electrode lead-out hole can be opened on the wall body 2131 and the electrode terminal 22 can be arranged in the electrode lead-out hole. At least part of the electrode terminal 22 is protruded on the surface of the wall body 2131 facing away from the electrode assembly 23 and is used to be electrically connected to the busbar 30.

[0136] The first boss 2132 is a portion of the first wall 213 for connecting the busbar 30. In some embodiments, the first boss 2132 and the wall body 2131 may be integrally formed components, for example, the first boss 2132 and the wall body 2131 may be integrally formed using a stamping process. In other embodiments, the first boss 2132 and the wall body 2131 may be independently formed and then connected as a whole, and the connection between the first boss 2132 and the wall body 2131 may be, but is not limited to, welding, bonding, fastening connection, etc. It can be understood that the first boss 2132 protrudes from the surface of the wall 2131 facing away from the electrode assembly 23 in the direction away from the electrode assembly 23, and at least a portion of the electrode terminal 22 protrudes from the surface of the wall 2131 facing away from the electrode assembly 23 in the direction away from the electrode assembly 23. The protrusion height of the first boss 2132 relative to the surface of the wall 2131 facing away from the electrode assembly 23 and the protrusion height of the electrode terminal 22 relative to the surface of the wall 2131 facing away from the electrode assembly 23 may be the same or different. The shape of the first boss 2132 may be the same as that of the electrode terminal 22, or it may be different from the shape of the electrode terminal 22. The shape of the first boss 2132 may be, but is not limited to, cylindrical, prismatic, etc. The first boss 2132 is used to electrically connect to one bus 30, and the electrode terminal 22 is used to electrically connect to another bus 30. The connection method between the first boss 2132 and the busbar 30 may be, but is not limited to, welding, bonding, fastening connection, etc. Similarly, the connection method between the electrode terminal 22 and the busbar 30 may be, but is not limited to, welding, bonding, fastening connection, etc.

[0137] In some embodiments, among two adjacent battery cells 20 of a battery 100, one bus 30 is connected between the electrode terminal 22 of the first battery cell 20 and the first boss 2132 of the second battery cell 20, and another bus 30 is connected between the first boss 2132 of the first battery cell 20 and the electrode terminal 22 of the second battery cell 20, so that the two adjacent battery cells 20 of the battery 100 are connected in series.

[0138] In other embodiments, among two adjacent battery cells 20 of the battery 100, one bus 30 is connected between the electrode terminal 22 of the first battery cell 20 and the electrode terminal 22 of the second battery cell 20, and another bus 30 is connected between the first boss 2132 of the first battery cell 20 and the first boss 2132 of the second battery cell 20, so as to connect the two adjacent battery cells 20 of the battery 100 in parallel.

[0139] By adopting the above technical solution, the difference between the connection height between one busbar 30 and the electrode terminal 22 and the connection height between another busbar 30 and the first wall 213 can be reduced, which facilitates the connection equipment to electrically connect the battery cell 20 and the busbar 30.

[0140] In some embodiments of this application, please refer to Fig. 9 , Fig.10 , Fig.14 and Fig.15 The first boss 2132 has a first connection surface 21321 for connecting to the busbar 30 , and the electrode terminal 22 has a second connection surface 221 for connecting to the busbar 30 . The height of the first connection surface 21321 is equal to the height of the second connection surface 221 .

[0141] The first connection surface 21321 is a surface of the first boss 2132 for connecting to the busbar 30. In some embodiments, the first connection surface 21321 is a surface of the first boss 2132 facing away from the electrode assembly 23. The first connection surface 21321 can be a plane or a curved surface.

[0142] The second connection surface 221 is a surface of the electrode terminal 22 for connecting to the busbar 30. In some embodiments, the second connection surface 221 is a surface of the electrode terminal 22 facing away from the electrode assembly 23. The second connection surface 221 can be a flat surface or a curved surface.

[0143] The height of the first connecting surface 21321 is equal to the height of the second connecting surface 221. In other words, in this embodiment, the protruding height of the first boss 2132 relative to the surface of the wall 2131 facing away from the electrode assembly 23 is the same as the protruding height of the electrode terminal 22 relative to the surface of the wall 2131 facing away from the electrode assembly 23. That is, electrical connection operations can be performed between the bus 30 and the electrode terminal 22 and between the bus 30 and the first boss 2132 at the same height position.

[0144] It should be noted that due to manufacturing tolerances, there may be a certain height difference between the first connecting surface 21321 and the second connecting surface 221. In the present embodiment, the height difference between the first connecting surface 21321 and the second connecting surface 221 is less than or equal to 0.05 millimeters (mm), that is, the height of the first connecting surface 21321 is deemed to be equal to the height of the second connecting surface 221.

[0145] In the related art, a connecting device is usually used to perform an electrical connection operation between the battery cell 20 and the busbar 30. If the protruding height of the electrode terminal 22 relative to the surface of the wall 2131 facing away from the electrode assembly 23 is significantly different from the height of the portion of the first wall 213 used to connect the busbar 30, the connecting device needs to perform an electrical connection operation between the electrode terminal 22 and one busbar 30 at one height position, and perform an electrical connection operation between the first wall 213 and another busbar 30 at another height position. This will cause the movement trajectory of the connecting head of the connecting device to become complicated, affect the welding accuracy of the connecting device, and even cause cold welding.

[0146] By adopting the above technical solution, electrical connection operations can be performed between the busbar 30 and the electrode terminal 22 and between the busbar 30 and the first boss 2132 at the same height, which facilitates the connection equipment to electrically connect the battery cell 20 and the busbar 30.

[0147] In some embodiments of this application, please refer to Fig. 9 and Fig.10 The battery cell 20 further includes a first adapter 24 and a second adapter 25 . The first adapter 24 is connected between the electrode terminal 22 and the first pole tab 232 , and the second adapter 25 is connected between the first wall 213 and the second pole tab 233 .

[0148] The first adapter 24 is a component for connecting the electrode terminal 22 and the first pole tab 232. In other words, in this embodiment, the electrode terminal 22 and the first pole tab 232 are indirectly connected through the first adapter 24, so that the electrode terminal 22 and the first pole tab 232 are conductively connected. The connection between the electrode terminal 22 and the first adapter 24 can be, but is not limited to, welding, bonding, fastening connection, etc., and the connection between the first pole tab 232 and the first adapter 24 can be, but is not limited to, welding, bonding, fastening connection, etc.

[0149] The second adapter 25 is a component for connecting the first wall 213 and the second pole tab 233. In other words, in this embodiment, the first wall 213 and the second pole tab 233 are indirectly connected through the second adapter 25, so that the first wall 213 and the second pole tab 233 are conductively connected. The connection between the first wall 213 and the second adapter 25 can be, but not limited to, welding, bonding, fastening connection, etc., and the connection between the second pole tab 233 and the second adapter 25 can be, but not limited to, welding, bonding, fastening connection, etc.

[0150] By adopting the above technical solution, it is convenient to electrically connect the electrode terminal 22 with the first electrode tab 232 and to electrically connect the first wall 213 with the second electrode tab 233 .

[0151] In some embodiments of this application, please refer to Fig. 9 and Fig.10 The first adapter 24 has a third connection surface 241 for connecting to the first pole tab 232 , and the second adapter 25 has a fourth connection surface 251 for connecting to the second pole tab 233 . The height of the third connection surface 241 is equal to that of the fourth connection surface 251 .

[0152] The third connection surface 241 is a surface of the first adapter 24 for connecting to the first electrode tab 232. In some embodiments, the third connection surface 241 is a surface of the first adapter 24 facing the electrode assembly 23. The third connection surface 241 can be a plane or a curved surface.

[0153] The fourth connection surface 251 is a surface of the second adapter 25 for connecting the second electrode tab 233. In some embodiments, the fourth connection surface 251 is a surface of the second adapter 25 facing the electrode assembly 23. The fourth connection surface 251 can be a plane or a curved surface.

[0154] The height of the third connection surface 241 is equal to the height of the fourth connection surface 251. In some embodiments, when the third connection surface 241 and the fourth connection surface 251 are planes, the third connection surface 241 and the fourth connection surface 251 are on the same horizontal plane (a plane perpendicular to the height direction of the battery cell 20). Accordingly, the lead-out height of the first pole lug 232 from the electrode body 231 toward the third connection surface 241 is equal to the lead-out height of the second pole lug 233 from the electrode body 231 toward the fourth connection surface 251, that is, electrical connection operations can be performed between the first adapter 24 and the first pole lug 232 and between the second adapter 25 and the second pole lug 233 at the same height position.

[0155] It should be noted that due to manufacturing tolerances, there may be a certain height difference between the third connecting surface 241 and the fourth connecting surface 251. In the present embodiment, the height difference between the third connecting surface 241 and the fourth connecting surface 251 is less than or equal to 0.05 mm, that is, the height of the third connecting surface 241 is deemed to be equal to the height of the fourth connecting surface 251.

[0156] In the related art, a connecting device is usually used to electrically connect the first pole ear 232 and the first adapter 24, and to electrically connect the second pole ear 233 and the second adapter 25. If the height of the third connecting surface 241 is significantly different from the height of the fourth connecting surface 251, the connecting device needs to electrically connect the first pole ear 232 and the first adapter 24 at one height position, and electrically connect the second pole ear 233 and the second adapter 25 at another height position. This will cause the movement trajectory of the connecting head of the connecting device to become complicated, affect the welding accuracy of the connecting device, and even cause cold soldering.

[0157] By adopting the above technical solution, electrical connection operations can be performed between the first adapter 24 and the first pole ear 232 and between the second adapter 25 and the second pole ear 233 at the same height, which facilitates the connection device to electrically connect the electrode assembly 23 to the electrode terminal 22 and the shell 21.

[0158] In some embodiments of this application, please refer to Fig.15 The first wall 213 further includes a second boss 2133 , which is protruding from a surface of the wall 2131 facing the electrode assembly 23 , and the second electrode tab 233 is connected to the second boss 2133 .

[0159] The second boss 2133 is a portion of the first wall 213 used to connect the second pole ear 233. In other words, in this embodiment, the second pole ear 233 is directly connected to the first wall 213, and the connection method between the second pole ear 233 and the second boss 2133 may be, but not limited to, welding, bonding, fastening connection, etc. In some embodiments, the second boss 2133 and the above-mentioned wall body 2131 may be an integrally formed component, for example, the second boss 2133 and the above-mentioned wall body 2131 are integrally formed using a stamping process. In other embodiments, the second boss 2133 and the above-mentioned wall body 2131 may be independently formed and then connected as a whole, and the connection method between the second boss 2133 and the above-mentioned wall body 2131 may be, but not limited to, welding, bonding, fastening connection, etc. It can be understood that the second boss 2133 protrudes from the surface of the wall 2131 facing the electrode assembly 23 toward the direction close to the electrode assembly 23, and at least a portion of the electrode terminal 22 protrudes from the surface of the wall 2131 facing the electrode assembly 23 toward the direction close to the electrode assembly 23. The protruding height of the second boss 2133 relative to the surface of the wall 2131 facing the electrode assembly 23 and the protruding height of the electrode terminal 22 relative to the surface of the wall 2131 facing the electrode assembly 23 may be the same or different. The shape of the second boss 2133 may be the same as that of the electrode terminal 22, or it may be different from the shape of the electrode terminal 22. The shape of the second boss 2133 may be, but is not limited to, cylindrical, prismatic, etc. The first boss 2132 is electrically connected to one busbar 30, and the electrode terminal 22 is electrically connected to another busbar 30.

[0160] By adopting the above technical solution, the difference between the connection height between the second pole ear 233 and the first wall 213 and the connection height between the first pole ear 232 and the electrode terminal 22 can be reduced, which facilitates the connection equipment to electrically connect the first wall 213 and the second pole ear 233.

[0161] In some embodiments of this application, please refer to Fig.14 and Fig.15 The battery cell 20 also includes a first adapter 24, which is connected between the electrode terminal 22 and the first pole ear 232. The first adapter 24 has a third connecting surface 241 for connecting to the first pole ear 232. The second boss 2133 has a fifth connecting surface 21331 for connecting to the second pole ear 233. The height of the third connecting surface 241 is equal to the height of the fifth connecting surface 21331.

[0162] The fifth connection surface 21331 is a surface of the second boss 2133 for connecting to the second electrode tab 233. In some embodiments, the fifth connection surface 21331 is a surface of the second boss 2133 facing the electrode assembly 23. The fifth connection surface 21331 may be a plane or a curved surface.

[0163] The height of the third connecting surface 241 is equal to the height of the fifth connecting surface 21331. In some embodiments, when the third connecting surface 241 and the fifth connecting surface 21331 are planes, the third connecting surface 241 and the fifth connecting surface 21331 are on the same horizontal plane (a plane perpendicular to the height direction of the battery cell 20). Accordingly, the lead-out height of the first pole lug 232 from the electrode body 231 toward the third connecting surface 241 is equal to the lead-out height of the second pole lug 233 from the electrode body 231 toward the fifth connecting surface 21331, that is, electrical connection operations can be performed between the first adapter 24 and the first pole lug 232 and between the second boss 2133 and the second pole lug 233 at the same height position.

[0164] It should be noted that due to manufacturing tolerances, there may be a certain height difference between the third connecting surface 241 and the fifth connecting surface 21331. In the present embodiment, the height difference between the third connecting surface 241 and the fifth connecting surface 21331 is less than or equal to 0.05 mm, that is, the height of the third connecting surface 241 is considered to be equal to the height of the fifth connecting surface 21331.

[0165] In the related art, a connecting device is usually used to perform an electrical connection operation on the first pole ear 232 and the second pole ear 233. If the height of the third connecting surface 241 is significantly different from the height of the fifth connecting surface 21331, the connecting device needs to perform an electrical connection operation on the first pole ear 232 and the first adapter 24 at one height position, and perform an electrical connection operation on the second pole ear 233 and the second boss 2133 at another height position. This will cause the movement trajectory of the connecting head of the connecting device to become complicated, affect the welding accuracy of the connecting device, and even cause cold soldering.

[0166] By adopting the above technical solution, electrical connection operations can be performed between the first adapter 24 and the first pole ear 232 and between the second boss 2133 and the second pole ear 233 at the same height, which facilitates the connection device to electrically connect the electrode assembly 23 to the electrode terminal 22 and the shell 21.

[0167] In some embodiments of this application, please refer to Fig.15 The second boss 2133 has a fifth connection surface 21331 for connecting to the second pole tab 233 , the electrode terminal 22 has a sixth connection surface for connecting to the first pole tab 232 , and the height of the fifth connection surface 21331 is equal to the height of the sixth connection surface.

[0168] The sixth connection surface is a surface of the electrode terminal 22 for connecting to the first electrode tab 232. In some embodiments, the sixth connection surface is a surface of the electrode terminal 22 facing the electrode assembly 23. The sixth connection surface may be a plane or a curved surface.

[0169] The height of the fifth connection surface 21331 is equal to the height of the sixth connection surface. In some embodiments, when the fifth connection surface 21331 and the sixth connection surface are planes, the fifth connection surface 21331 and the sixth connection surface are on the same horizontal plane (a plane perpendicular to the height direction of the battery cell 20). Accordingly, the lead-out height of the first pole lug 232 from the electrode body 231 toward the sixth connection surface is equal to the lead-out height of the second pole lug 233 from the electrode body 231 toward the fifth connection surface 21331, that is, electrical connection operations can be performed between the electrode terminal 22 and the first pole lug 232 and between the second boss 2133 and the second pole lug 233 at the same height position.

[0170] It should be noted that due to manufacturing tolerances, there may be a certain height difference between the fifth connecting surface 21331 and the sixth connecting surface. In the present embodiment, the height difference between the fifth connecting surface 21331 and the sixth connecting surface is less than or equal to 0.05 mm, that is, the height of the fifth connecting surface 21331 is deemed to be equal to the height of the sixth connecting surface.

[0171] In the related art, a connecting device is usually used to perform an electrical connection operation on the first pole ear 232 and the second pole ear 233. If the height of the sixth connecting surface is significantly different from the height of the fifth connecting surface 21331, the connecting device needs to perform an electrical connection operation on the first pole ear 232 and the electrode terminal 22 at one height position, and perform an electrical connection operation on the second pole ear 233 and the second boss 2133 at another height position. This will cause the movement trajectory of the connecting head of the connecting device to become complicated, affect the welding accuracy of the connecting device, and even cause cold soldering.

[0172] By adopting the above technical solution, electrical connection operations can be performed between the electrode terminal 22 and the first pole ear 232 and between the second boss 2133 and the second pole ear 233 at the same height, which facilitates the connection equipment to electrically connect the electrode assembly 23 to the electrode terminal 22 and the shell 21.

[0173] In some embodiments of this application, please refer to Figures 16 to 22 The housing 21 includes a first wall 213 and a second wall 2111 , the electrode terminal 22 is disposed on the first wall 213 and insulated from the first wall 213 , and the second electrode tab 233 is connected to the second wall 2111 .

[0174] The first wall 213 may be one of the bottom wall of the shell 211, the side wall of the shell 211, and the cover 212, and the second wall 2111 may be the other of the bottom wall of the shell 211, the side wall of the shell 211, and the cover 212, wherein the bottom wall of the shell 211 refers to the wall portion of the shell 211 and the cover 212 arranged opposite to each other, and the side wall of the shell 211 refers to the wall portion of the shell 211 located between the cover 212 and the bottom wall of the shell 211 and connected to the periphery of the bottom wall of the shell 211. In some embodiments, the first wall 213 constitutes the above-mentioned cover 212, and the second wall 2111 constitutes the bottom wall of the shell 211 or the side wall of the shell 211. The connection method between the second pole tab 233 and the second wall 2111 may be, but is not limited to, welding, bonding, fastening connection, etc.

[0175] By adopting the above technical solution, it is convenient to electrically connect the second electrode tab 233 to the housing 21 .

[0176] In some embodiments of this application, please refer to Figures 16 to 20 The second wall 2111 is provided with a through hole 21111 , and the through hole 21111 connects the internal environment of the shell 21 with the external environment of the shell 21 . The second pole ear 233 is passed through the through hole 21111 and connected to the second wall 2111 .

[0177] In some embodiments, the housing 21 further includes a third wall, the first wall 213 constitutes the cover 212, the electrode terminal 22 is disposed on the cover 212, the second wall 2111 constitutes the bottom wall of the housing 211, that is, the second wall 2111 is disposed opposite to the cover 212, the third wall constitutes the side wall of the housing 211, the first pole ear 232 is connected to the side of the electrode body 231 facing the cover 212, so as to electrically connect the first pole ear 232 to the electrode terminal 22, and the second pole ear 233 is connected to the side of the electrode body 231 facing the bottom wall of the housing 211, so as to electrically connect the second pole ear 233 to the second wall 2111. The second wall 2111 and the third wall may be integrally formed components, for example, the second wall 2111 and the third wall are integrally formed by a stamping process, the second wall 2111 and the third wall may also be independently formed and then connected as a whole, and the connection method between the second wall 2111 and the third wall may be, but is not limited to, welding, bonding, etc.

[0178] The through hole 21111 refers to a hole structure that penetrates the surface of the second wall 2111 facing the electrode assembly 23 and the surface of the second wall 2111 facing away from the electrode assembly 23. After the electrode assembly 23 is placed in the internal environment of the shell 21, the second pole ear 233 can extend to the external environment of the shell 21 through the through hole 21111, and the second pole ear 233 and the second wall 2111 are electrically connected in the external environment of the shell 21. The shape of the through hole 21111 can be adapted to the shape of the second pole ear 233. In some embodiments, the second pole ear 233 is a sheet structure, the through hole 21111 is a slit structure, and the width of the through hole 21111 is slightly larger than the thickness of the second pole ear 233, so that the second pole ear 233 can pass through the through hole 21111, and at the same time, it can play a role in limiting the second pole ear 233.

[0179] In some embodiments, the second pole ear 233 is welded to the second wall 2111. Specifically, after the electrode assembly 23 is placed in the internal environment of the housing 21, the second pole ear 233 can extend to the external environment of the housing 21 through the through hole 21111, and the second pole ear 233 and the second wall 2111 are welded in the external environment of the housing 21.

[0180] By adopting the above technical solution, the second pole tab 233 and the second wall 2111 can be electrically connected outside the shell 21, which facilitates the electrical connection of the second pole tab 233 to the second wall 2111, thereby effectively improving the assembly efficiency of the battery cell 20.

[0181] In some embodiments of this application, please refer to Figures 17 to 20 The battery cell 20 further includes a sealing cover 26 , which covers the through hole 21111 and cooperates with the second wall 2111 to clamp the second pole ear 233 .

[0182] The cover 26 is used to close the through hole 21111 to prevent foreign objects such as water vapor and dust from entering the internal environment of the battery cell 20 through the through hole 21111. The cover 26 is also used to cooperate with the second wall 2111 to clamp the second pole ear 233. Specifically, after the second pole ear 233 extends to the external environment of the shell 21 through the through hole 21111, the cover 26 cooperates with the second wall 2111 to clamp the portion of the second pole ear 233 located in the external environment of the shell 21, so as to shape the portion of the second pole ear 233 located in the external environment of the shell 21, so that the portion of the second pole ear 233 located in the external environment of the shell 21 can be close to the second wall 2111. In some embodiments, when the cover 26 cooperates with the second wall 2111 to clamp the second pole ear 233, the second pole ear 233 can be welded to the second wall 2111 through the cover 26 by a penetration welding process.

[0183] In some embodiments, in the thickness direction of the second wall 2111 , the projection of the second pole tab 233 is located within the projection range of the cover 26 . In other words, the cover 26 can completely cover the second pole tab 233 to protect the second pole tab 233 .

[0184] By adopting the above technical solution, not only can the second pole ear 233 be shaped so that the second pole ear 233 can be tightly attached to the second wall 2111, thereby reducing the risk of the second pole ear 233 detaching from the second wall 2111, but the second pole ear 233 can also be effectively protected, thereby reducing the risk of damage to the second pole ear 233.

[0185] In some embodiments of the present application, the surface of the cover 26 facing away from the electrode assembly 23 is flush with the surface of the second wall 2111 facing away from the electrode assembly 23 .

[0186] In some embodiments, the surface of the cover 26 facing away from the electrode assembly 23 and the surface of the second wall 2111 facing away from the electrode assembly 23 are both planes, and the surface of the cover 26 facing away from the electrode assembly 23 and the surface of the second wall 2111 facing away from the electrode assembly 23 are on the same horizontal plane (a plane perpendicular to the height direction of the battery cell 20).

[0187] By adopting the above technical solution, the outer surface of the battery cells 20 can be made flatter, so that the battery cells 20 can be neatly arranged inside the battery 100 .

[0188] In some embodiments of this application, please refer to Figure 20 to Figure 21 The battery cell 20 further includes a positioning member 27 disposed on the second wall 2111 , and the positioning member 27 is used to limit the position of the second pole tab 233 so that the second pole tab 233 contacts the second wall 2111 .

[0189] The positioning member 27 is a component used to limit the position of the second pole ear 233. After the electrode assembly 23 and the positioning member 27 are placed in the housing 21, the second pole ear 233 can maintain contact with the second wall 2111 under the limiting effect of the positioning member 27. In some embodiments, the electrode assembly 23 and the positioning member 27 can be assembled first so that the positioning member 27 limits the second pole ear 233 to a specific position, and then the electrode assembly 23 and the positioning member 27 are placed in the housing 21 together. The positioning member 27 can be an integrally formed component or a split connecting component. The material of the positioning member 27 can be but is not limited to plastic, aluminum, steel, copper, etc. In some embodiments, in order to further reduce the weight of the battery cell 20 and improve the mass energy density of the battery cell 20, the material of the positioning member 27 is plastic, and the plastic can be but is not limited to polypropylene, polyester resin, soluble polytetrafluoroethylene, etc.

[0190] In some embodiments, when the positioning member 27 defines the second pole tab 233 at a specific position and the electrode assembly 23 and the positioning member 27 are placed in the housing 21, the second pole tab 233 can be welded to the second wall 2111 through the second wall 2111 using a penetration welding process.

[0191] By adopting the above technical solution, after the positioning member 27 and the electrode assembly 23 are placed in the outer shell 21, the position of the second pole ear 233 can be limited by the positioning member 27 so that the second pole ear 233 contacts the second wall 2111, which facilitates the electrical connection of the second pole ear 233 to the second wall 2111, thereby effectively improving the assembly efficiency of the battery cell 20.

[0192] In some embodiments of this application, please refer to Fig.21 The positioning member 27 is provided with a positioning hole, and the second pole ear 233 is passed through the positioning hole so that the second pole ear 233 contacts the second wall 2111 .

[0193] The positioning hole is a hole structure used to limit the second pole lug 233 to a specific position. It can be understood that the second pole lug 233 can extend through the positioning hole toward the direction close to the second wall 2111. When the second pole lug 233 is in a specific position, the second pole lug 233 can maintain a state of contact with the second wall 2111. The shape of the positioning hole can be adapted to the shape of the second pole lug 233. In some embodiments, the second pole lug 233 is a sheet structure, the positioning hole is a slit structure, and the width of the positioning hole is slightly larger than the thickness of the second pole lug 233, so that the second pole lug 233 can pass through the positioning hole, and at the same time, it can play a role in limiting the second pole lug 233.

[0194] The opening direction of the positioning hole can be parallel to the surface of the second wall 2111 facing the electrode assembly 23, can be perpendicular to the surface of the second wall 2111 facing the electrode assembly 23, or can be inclined to the surface of the second wall 2111 facing the electrode assembly 23. In some embodiments, the opening direction of the positioning hole is inclined relative to the surface of the second wall 2111 facing the electrode assembly 23, so that when the second pole ear 233 is inserted into the positioning hole, the second pole ear 233 is also inclined relative to the surface of the second wall 2111 facing the electrode assembly 23. After the electrode assembly 23 and the positioning member 27 are placed in the housing 21, the second wall 2111 can press against one end of the second pole ear 233 away from the electrode body 231, so that the second pole ear 233 is gradually bent until the second pole ear 233 fits the second wall 2111.

[0195] By adopting the above technical solution, the second pole tab 233 is effectively positioned.

[0196] In some embodiments of the present application, the battery cell 20 further includes an insulating layer (not shown), which is coated on the outer surface of the housing 21 .

[0197] The insulating layer is used to insulate and separate the battery cell 20 from other conductive components. In some embodiments, the insulating layer is an insulating film, which covers the outer surface of the shell 21. The material of the insulating film can be but is not limited to polyimide, polyethylene, polyvinylidene fluoride, polytetrafluoroethylene, etc.

[0198] Of course, in other embodiments, the insulating layer may also be an insulating coating, and the insulating coating is coated on the outer surface of the shell 21 .

[0199] By adopting the above technical solution, two adjacent battery cells 20 in the battery 100 are effectively insulated and separated, thereby reducing the risk of short circuit of the battery 100 and effectively improving the safety performance of the battery 100.

[0200] Second, please also refer to Figures 2 to 5 The embodiment of the present application further provides a battery 100, comprising the battery cell 20 described in any of the above embodiments.

[0201] The battery 100 provided in the embodiment of the present application adopts the battery cell 20 described in any of the above embodiments, thereby effectively improving the energy density of the battery 100.

[0202] In some embodiments of the present application, please refer to 3 to Figure 4 The battery 100 further includes a busbar 30 . There are multiple battery cells 20 . The busbar 30 is electrically connected between the electrode terminal 22 of one battery cell 20 and the housing 21 of another battery cell 20 .

[0203] The busbar 30 is a component for electrically connecting at least two battery cells 20 .

[0204] In some embodiments, see Figure 3 The second electrode tab 233 is electrically connected to the cover 212 , and the busbar 30 is electrically connected between the electrode terminal 22 of one battery cell 20 and the cover 212 of another battery cell 20 .

[0205] In some other embodiments, see Figure 4 and Figure 5 , the second electrode tab 233 is electrically connected to the housing 211, and the busbar 30 is electrically connected between the electrode terminal 22 of one battery cell 20 and the housing 211 of another battery cell 20. As an example, Figure 4 As shown, the busbar 30 is electrically connected between the electrode terminal 22 of one battery cell 20 and the bottom wall of the housing 211 of another battery cell 20. Figure 5 As shown, the busbar 30 is electrically connected between the electrode terminal 22 of one battery cell 20 and the side wall of the housing 211 of another battery cell 20 .

[0206] By adopting the above technical solution, it is convenient to electrically connect the battery cells 20 in the battery 100 .

[0207] Third, see Figure 1 , an embodiment of the present application further provides an electrical device, comprising the battery 100 described in any of the above embodiments.

[0208] The electric device provided in the embodiment of the present application adopts the battery 100 described in any of the above embodiments, thereby effectively improving the battery life performance of the electric device.

[0209] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: shell; An electrode terminal is disposed on the housing and is insulated from the housing; An electrode assembly is accommodated in the shell, and the electrode assembly includes a first pole ear and a second pole ear, the polarity of the first pole ear is opposite to the polarity of the second pole ear, the first pole ear is electrically connected to the electrode terminal, and the second pole ear is electrically connected to the shell.

2. The battery cell according to claim 1, characterized in that: The housing includes a first wall, the electrode terminal is disposed on the first wall and is insulated from the first wall, and the second electrode tab is connected to the first wall.

3. The battery cell according to claim 2, characterized in that: The first wall includes a wall body and a first boss, the electrode terminal is arranged on the wall body and is used to be electrically connected to a busbar, and the first boss is protruding from the surface of the wall body facing away from the electrode assembly and is used to be electrically connected to another busbar.

4. The battery cell according to claim 3, characterized in that: The first boss has a first connection surface for connecting to the bus bar, and the electrode terminal has a second connection surface for connecting to the bus bar. The height of the first connection surface is equal to the height of the second connection surface.

5. The battery cell according to any one of claims 2 to 4, characterized in that: The battery cell further includes a first adapter and a second adapter, wherein the first adapter is connected between the electrode terminal and the first electrode tab, and the second adapter is connected between the first wall and the second electrode tab.

6. The battery cell according to claim 5, characterized in that: The first adapter has a third connection surface for connecting to the first pole tab, the second adapter has a fourth connection surface for connecting to the second pole tab, and the height of the third connection surface is equal to the height of the fourth connection surface.

7. The battery cell according to any one of claims 2 to 4, characterized in that: The first wall includes a wall body and a second boss, the electrode terminal is arranged on the wall body, the second boss is protruding from the surface of the wall body facing the electrode assembly, and the second electrode tab is connected to the second boss.

8. The battery cell according to claim 7, characterized in that: The battery cell also includes a first adapter connected between the electrode terminal and the first pole lug, the first adapter having a third connecting surface for connecting to the first pole lug, the second boss having a fifth connecting surface for connecting to the second pole lug, and a height of the third connecting surface is equal to a height of the fifth connecting surface.

9. The battery cell according to claim 7, characterized in that: The second boss has a fifth connection surface for connecting to the second electrode tab, the electrode terminal has a sixth connection surface for connecting to the first electrode tab, and a height of the fifth connection surface is equal to a height of the sixth connection surface.

10. The battery cell according to claim 1, characterized in that: The housing includes a first wall and a second wall, the electrode terminal is arranged on the first wall and insulated from the first wall, and the second electrode tab is connected to the second wall.

11. The battery cell according to claim 10, characterized in that: The second wall is provided with a through hole, the through hole communicating the internal environment of the housing with the external environment of the housing, and the second pole tab is passed through the through hole and connected to the second wall.

12. The battery cell according to claim 11, characterized in that: The battery cell further includes a sealing cover, which is disposed on the through hole and cooperates with the second wall to clamp the second pole lug.

13. The battery cell according to claim 12, characterized in that: The surface of the cover facing away from the electrode assembly is flush with the surface of the second wall facing away from the electrode assembly.

14. The battery cell according to claim 10, characterized in that: The battery cell further includes a positioning member disposed on the second wall, wherein the positioning member is used to limit the position of the second pole lug so that the second pole lug contacts the second wall.

15. The battery cell according to claim 14, characterized in that: The positioning member is provided with a positioning hole, and the second pole tab is passed through the positioning hole so that the second pole tab contacts the second wall.

16. The battery cell according to any one of claims 10 to 15, characterized in that: The first wall is arranged opposite to the second wall, and the electrode assembly further comprises an electrode body, the first electrode tab is connected to a side of the electrode body facing the first wall, and the second electrode tab is connected to a side of the electrode body facing the second wall.

17. The battery cell according to any one of claims 2 to 16, characterized in that: The housing includes a shell and a cover body disposed on the shell, and the first wall constitutes the cover body.

18. The battery cell according to any one of claims 1 to 17, characterized in that: The battery cell further includes an insulating layer member, and the insulating layer member is coated on the outer surface of the shell.

19. The battery cell according to any one of claims 1 to 18, characterized in that: The battery cell is a sodium ion battery cell.

20. The battery cell according to any one of claims 1 to 19, characterized in that: The shell is one of an aluminum shell, a steel shell and a copper shell.

21. A battery, characterized in that: The battery comprises the battery cell according to any one of claims 1-20.

22. The battery according to claim 21, characterized in that The battery further includes a busbar, the number of the battery cells is plural, and the busbar is electrically connected between the electrode terminal of one of the battery cells and the housing of another of the battery cells.

23. The battery according to claim 22, characterized in that The busbar is connected between the electrode terminal of one of the battery cells and the bottom wall of the housing of another of the battery cells; or, The busbar is connected between the electrode terminal of one of the battery cells and a side wall of the housing of another of the battery cells.

24. An electrical equipment, characterized in that: The electric device comprises the battery as claimed in any one of claims 21-23.

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