Battery monomer, battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and provides a battery monomer, a battery and electric equipment, the battery monomer comprises an electrode terminal, an electrode assembly and an adapter plate, and the electrode assembly comprises an electrode main body and a tab connected to the electrode main body; the adapter piece comprises a first connecting part electrically connected with the electrode terminal and a second connecting part electrically connected with the tab, the first connecting part protrudes towards the direction close to the electrode main body relative to the second connecting part, and the second connecting part is connected to one side of the first connecting part along the width direction of the battery monomer. According to the battery monomer provided by the invention, the second connecting part is connected to one side, along the width direction of the battery monomer, of the first connecting part, so that when the size of the tabs in the length direction of the battery monomer is relatively large due to dislocation of the tabs, the tabs cannot abut against the first connecting part, and the tabs can be prevented from being folded; therefore, the risk of short circuit of the electrode assembly is reduced, and the safety performance of the battery monomer is 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] A battery cell generally includes an electrode terminal, an electrode assembly and an adapter. The electrode assembly includes an electrode body and a tab connected to the electrode body. The tab is connected to the electrode terminal through an adapter. In the related art, when the length of a battery cell is limited, the tab is easily pressed against the adapter and folded. Inserting the folded tab back into the electrode body will cause a short circuit in the electrode assembly, thereby affecting the safety of the battery cell. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide a battery cell, a battery and an electrical device to solve the technical problem in the related art that the electrode assembly of the battery cell is short-circuited, resulting in a decrease in the safety performance of the battery cell.

[0004] To achieve the above purpose, the technical solution adopted in this application is:

[0005] In a first aspect, a battery cell is provided, the battery cell comprising an electrode terminal, an electrode assembly and a converter, the electrode assembly comprising an electrode body and a tab connected to the electrode body; the converter comprising a first connecting portion electrically connected to the electrode terminal and a second connecting portion electrically connected to the tab, the first connecting portion protruding relative to the second connecting portion in a direction close to the electrode body, and the second connecting portion connected to one side of the first connecting portion along the width direction of the battery cell.

[0006] In the technical solution of the embodiment of the present application, by setting the first connecting part to protrude in the direction close to the electrode body relative to the second connecting part, after the first connecting part is electrically connected to the electrode terminal and the second connecting part is electrically connected to the pole ear, the partial structure of the electrode terminal and the partial structure of the pole ear are at the same height in the height direction of the battery body, and the electrode terminal, the pole ear and the adapter are arranged relatively compactly in the height direction of the battery cell, which can improve the structural compactness of the battery cell.

[0007] On this basis, in the technical solution of the embodiment of the present application, the second connection part is set to be connected to one side of the first connection part along the width direction of the battery cell. After such a setting, even if the size of the pole ear in the length direction of the battery cell is larger due to the misalignment of the pole ear, the pole ear will only be connected to the second connection part, and will not abut the first connection part, which can avoid the pole ear from folding, thereby reducing the risk of short circuit in the electrode assembly and improving the safety performance of the battery cell. In addition, the second connection part is set to be connected to one side of the first connection part along the width direction of the battery cell, and the size of the second connection part in the length direction of the battery cell is not limited by the first connection part, that is, the size of the second connection part in the length direction of the battery cell can be equal to the maximum limit size of the connecting piece in the length direction of the battery cell. In this way, it can be ensured as much as possible that the second connection part has enough length to be electrically connected to the pole ear, which is conducive to enhancing the stability of the electrical connection between the pole ear and the adapter.

[0008] In some embodiments, the number of the second connection parts is two, and the two second connection parts are arranged on opposite sides of the first connection part along the width direction of the battery cell. In this way, the two second adapter parts can be electrically connected to the two electrode assemblies respectively, so as to realize the parallel connection of the two electrode assemblies, thereby realizing the capacity increase of the battery cell; and the tabs of the two electrode assemblies are not easy to be folded, and the safety performance of the battery cell is better.

[0009] In some embodiments, the two second connection parts are spaced apart from each other to form an escape space, which can avoid the injection hole and other structures of the battery cell, thereby improving the compactness of the battery cell structure.

[0010] In some embodiments, the first connecting portion includes a first plate and a first flange, the first plate is protruding relative to the second connecting portion toward the electrode body, and the first flange is connected between the second connecting portion and the first plate.

[0011] In the technical solution of the embodiment of the present application, the first flange can isolate the electrode terminal and the pole lug, thereby reducing the risk of short circuit caused by direct electrical connection between the electrode terminal and the pole lug; and the first flange can position the electrode terminal in the width direction of the battery cell, which is conducive to quickly aligning the electrode terminal with the first connecting part, thereby improving the assembly efficiency of the electrode terminal and the first connecting part.

[0012] In some embodiments, the angle between the first flange and the first plate body is an obtuse angle. With such a configuration, during the production or assembly of the adapter sheet, multiple adapter sheets can be centrally loaded in a stacked state, thereby improving the loading efficiency; and, by designing the parameters such as the thickness of the first flange, the size of the angle between the first flange and the first plate body, and the thickness of the second connecting portion, when multiple adapter sheets are in a stacked state, a certain gap is maintained between the second connecting portions of two adjacent adapter sheets, thereby preventing the second connecting portions between two adjacent adapter sheets from fitting together, thereby avoiding the situation where multiple adapter sheets need to be removed due to the fitting together of two adjacent adapter sheets when a single adapter sheet needs to be removed, thereby improving the efficiency of the material removal, assembly and other processes.

[0013] In some embodiments, the first connection portion includes a second flange connected to one side of the first plate along the length direction of the battery cell, and one end of the second flange along the width direction of the battery cell is connected to the first flange.

[0014] In the technical solution of the embodiment of the present application, the second flange can isolate the electrode terminal and the pole lug, thereby reducing the risk of short circuit caused by direct electrical connection between the electrode terminal and the pole lug; and the second flange can position the electrode terminal in the length direction of the battery cell, which is conducive to quickly aligning the electrode terminal with the first connecting part, thereby improving the assembly efficiency of the electrode terminal and the first connecting part.

[0015] In some embodiments, the angle between the second flange and the first plate is an obtuse angle. In this way, when the angles between the first flange and the second flange and the first plate are both set to obtuse angles, during the production or assembly of the adapter, multiple adapters can be centrally loaded in a stacked state to improve the loading efficiency; and, by designing the parameters such as the thickness of the first flange, the thickness of the second flange, the size of the angle between the first flange and the first plate, the size of the angle between the second flange and the first plate, and the thickness of the second connecting portion, when multiple adapters are in a stacked state, a certain gap is maintained between the second connecting portions of two adjacent adapters to avoid the second connecting portions between the two adjacent adapters from fitting each other, thereby avoiding the situation where multiple adapters need to be removed due to the fitting of two adjacent adapters when a single adapter needs to be removed, thereby improving the efficiency of the material removal, assembly and other processes.

[0016] In some embodiments, the adapter plate further includes a second plate body, and the second plate body is connected between the second connecting portion and the second flange.

[0017] In the technical solution of the embodiment of the present application, a second plate body is arranged between the second connecting part and the second flange, so as to enhance the structural strength of the first connecting part and the second connecting part, and to avoid deformation of the first connecting part during electrical connection with the electrode terminal as much as possible, and to avoid deformation of the second connecting part during electrical connection with the tab as much as possible; and, in the case where a second plate body is arranged between the second connecting part and the second flange, neither the first flange nor the second flange is at the edge of the adapter sheet, so that the first connecting part including the first flange, the second flange and the first plate body can be directly stamped out on a single plate body by a stamping process, which is conducive to simplifying the production process and production cost of the adapter sheet.

[0018] In some embodiments, the first connecting portion and the second connecting portion are integrally formed, which can reduce the contact resistance of the adapter and improve the current transmission efficiency, thereby improving the performance and efficiency of the battery; it can also reduce the possibility of the adapter breaking and improve the structural stability and reliability of the adapter. In addition, the integral formation of the first connecting portion and the second connecting portion can also simplify the production process of the adapter, reduce the production steps and assembly time, and reduce production costs.

[0019] In a second aspect, a battery is provided, comprising the battery cell described in the first aspect.

[0020] Since the battery includes the above-mentioned battery monomer, it has at least all the beneficial effects of the above-mentioned battery monomer, which will not be described in detail here.

[0021] In a third aspect, an electrical device is provided, wherein the electrical device comprises the battery cell described in the first aspect, or the electrical device comprises the battery described in the second aspect.

[0022] Since the electrical equipment includes the above-mentioned battery cell or battery, it has at least all the beneficial effects of the above-mentioned battery cell or battery, which will not be described in detail here.

[0023] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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 related technical descriptions 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.

[0025] Figure 1 It is a schematic diagram of a top view structure of an adapter in the related art;

[0026] Figure 2 It is a schematic diagram of the main structure of the adapter, electrode terminal and tab in the related art;

[0027] Figure 3 It is a schematic diagram of the structure of the adapter, electrode terminal, end cover and electrode assembly in the related art;

[0028] Figure 4 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0029] Figure 5 A schematic diagram of an exploded structure of a battery provided in some embodiments of the present application;

[0030] Figure 6 A schematic diagram of an exploded structure of a battery cell provided in some embodiments of the present application;

[0031] Figure 7 A schematic diagram of the structure of the adapter sheet, end cover and electrode assembly of the battery cell provided in some embodiments of the present application;

[0032] Figure 8 A schematic diagram of the three-dimensional structure of an adapter provided in some embodiments of the present application;

[0033] Fig. 9 for Figure 8 The schematic diagram of the structure of the adapter, electrode terminal and electrode assembly in the assembled state is shown;

[0034] Fig.10 A schematic diagram of the three-dimensional structure of an adapter sheet provided in some other embodiments of the present application;

[0035] Fig.11 for Fig.10 A schematic diagram of the top view of the adapter shown;

[0036] Fig.12 for Fig.10 The schematic diagram of the structure of two adapter sheets stacked together is shown;

[0037] Fig.13 for Fig.10 The schematic diagram of the main structure of the adapter shown;

[0038] Fig.14 A schematic diagram of the three-dimensional structure of an adapter provided in some embodiments of the present application at a first viewing angle;

[0039] Fig.15 for Fig.14 The schematic diagram of the three-dimensional structure of the adapter shown in the second viewing angle;

[0040] Fig.16 A schematic diagram of the three-dimensional structure of an adapter provided in some further embodiments of the present application at a first viewing angle;

[0041] Fig.17 for Fig.16 The schematic diagram of the three-dimensional structure of the adapter plate shown in the second viewing angle.

[0042] Among them, the reference numerals in the figure are:

[0043] 10000-Vehicles;

[0044] 1000-battery; 2000-frame; 3000-controller; 4000-motor;

[0045] 100 - battery cell; 200 - housing; 210, first part; 220, second part;

[0046] 10a- adapter plate; 11a- electrode terminal connection portion; 12a- pole ear connection portion; 13a- bending portion;

[0047] 10-adapter; 11-first connecting portion; 111-first plate; 112-first flange; 113-second flange; 12-second connecting portion; 121-avoidance space; 13-second plate;

[0048] 20-electrode terminal; 21-positive electrode terminal; 22-negative electrode terminal;

[0049] 30-electrode assembly; 31-electrode body; 32-electrode ear; 321-positive electrode ear; 322-negative electrode ear;

[0050] 40-end cover;

[0051] 50-shell. DETAILED DESCRIPTION

[0052] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0053] In the description of the present application, 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 accompanying 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.

[0054] In addition, the terms "first" and "second" 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" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0055] See also Figures 1 to 3 In the related art, a battery cell 100 generally includes a switching sheet 10a, an electrode terminal 20 and an electrode assembly 30. The electrode assembly 30 is a component in the battery cell 100 where an electrochemical reaction occurs. The electrode assembly 30 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the electrode body 31 of the electrode assembly 30, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear 32. During the charge and discharge process of the battery cell 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the pole ear 32 is electrically connected to the electrode terminal 20 through the switching sheet 10a to form a current loop.

[0056] See also Figure 2 The adapter sheet 10a usually includes an electrode terminal connection portion 11a and a tab connection portion 12a. The electrode terminal connection portion 11a is used to electrically connect to the electrode terminal 20, and the tab connection portion 12a is used to electrically connect to the tab 32. In order to adapt to the heights of the electrode terminal 20 and the tab 32 at the same time and make the battery cell 100 more compact in the height direction, the electrode terminal connection portion 11a and the tab connection portion 12a of the adapter sheet 10a usually have a height difference, that is, the electrode terminal connection portion 11a and the tab connection portion 12a are usually connected by a bending portion 13a, and the electrode terminal connection portion 11a, the tab connection portion 12a and the bending portion 13a form a stepped shape. The adapter sheet 10a with the above structure has a shorter length of the tab connection portion 12a for electrically connecting to the tab 32.

[0057] Moreover, in the related art, in the process of preparing the electrode assembly 30, it is usually necessary to first form a plurality of spaced-apart pole tabs 32 on the pole sheet, and then wind or stack the pole sheet with the plurality of pole tabs 32. When winding or stacking the pole sheet with the pole tabs 32, factors such as the thickness variation of the pole sheet, the thickness variation of the diaphragm, and the difference in the die-cutting size of the pole tabs can easily cause the pole tabs to be misaligned, that is, the pole tabs that are supposed to overlap are misaligned with each other, which will cause the overall size of the pole tabs 32 of the prepared electrode assembly 30 in the length direction of the battery cell 100 to exceed the designed size. Please refer to Figure 3 When the dimension of the pole tab 32 in the length direction of the battery cell 100 exceeds the design dimension, when the pole tab 32 is electrically connected to the above-mentioned adapter sheet 10a, the pole tab 32 is easily pressed against the bent portion 13a of the adapter sheet 10a and folded. The folded pole tab 32 is inserted back into the electrode body 31, which will cause a short circuit in the electrode assembly 30, thereby affecting the safety of the battery cell 100.

[0058] In order to solve the above problems, the present application provides a battery cell, which includes an electrode terminal, an electrode assembly and a converter, the electrode assembly includes an electrode body and a pole ear connected to the electrode body; the converter includes a first connection portion electrically connected to the electrode terminal and a second connection portion electrically connected to the pole ear, the first connection portion protrudes relative to the second connection portion in a direction close to the electrode body, and the second connection portion is connected to one side of the first connection portion along the width direction of the battery cell.

[0059] The battery cell provided by the present application is configured such that the first connection portion is configured to protrude in the direction close to the electrode body relative to the second connection portion, so that after the first connection portion is electrically connected to the electrode terminal and the second connection portion is electrically connected to the pole ear, the partial structure of the electrode terminal and the partial structure of the pole ear are at the same height in the height direction of the battery body, and the electrode terminal, the pole ear and the adapter are arranged relatively compactly in the height direction of the battery cell, which can improve the structural compactness of the battery cell. On the premise of maintaining the high structural compactness of the electrode terminal, the pole ear and the adapter in the height direction of the battery cell, the battery cell provided by the present application is also configured such that the second connection portion is connected to one side of the first connection portion along the width direction of the battery cell. After such a configuration, even if the pole ear is dislocated so that the size of the pole ear in the length direction of the battery cell is larger, the pole ear will not abut the first connection portion, which can prevent the pole ear from folding, thereby reducing the risk of short circuit in the electrode assembly and improving the safety performance of the battery cell.

[0060] The battery cell disclosed in the embodiments of the present application can be used in a battery including the battery cell and an electrical device including the battery, wherein the electrical device can be, but is not limited to, a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. 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, and the like. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like.

[0061] 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.

[0062] See also Figure 4 , Figure 4 A schematic diagram of the structure of a vehicle 10000 provided in an embodiment of the present application. The vehicle 10000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1000 is provided inside the vehicle 10000, and the battery 1000 may be provided at the bottom, head or tail of the vehicle 10000, and the battery 1000 may be installed on the vehicle 10000 and the frame 2000. The battery 1000 may be used to power the vehicle 10000, for example, the battery 1000 may be used as an operating power source for the vehicle 10000. The vehicle 10000 may also include a controller 3000 and a motor 4000, and the controller 3000 is used to control the battery 1000 to power the motor 4000, for example, for the starting, navigation and working power requirements of the vehicle 10000 during driving.

[0063] In some embodiments of the present application, the battery 1000 can not only serve as an operating power source for the vehicle 10000, but also serve as a driving power source for the vehicle 10000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 10000.

[0064] See also Figure 5 , Figure 5Schematic diagram of the exploded structure of the battery 1000 provided for some embodiments of the present application. The battery 1000 includes a box 200 and a battery cell 100, and the battery cell 100 is contained in the box 200. Among them, the box 200 is used to provide a storage space for the battery cell 100, and the box 200 can adopt a variety of structures. In some embodiments, the box 200 may include a first part 210 and a second part 220, and the first part 210 and the second part 220 cover each other, and the first part 210 and the second part 220 jointly define a storage space for accommodating the battery cell 100. The second part 220 may be a hollow structure with an opening at one end, and the first part 210 may be a plate-like structure, and the first part 210 is covered on the opening side of the second part 220, so that the first part 210 and the second part 220 jointly define a storage space; the first part 210 and the second part 220 may also be hollow structures with an opening on one side, and the opening side of the first part 210 is covered on the opening side of the second part 220. Of course, the box body 200 formed by the first part 210 and the second part 220 can be in various shapes, such as a cylinder, a cuboid, etc.

[0065] In the battery 1000, there may be one or more battery cells 100. When there are multiple battery cells 100, the multiple battery cells 100 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 100 are both connected in series and in parallel. The multiple battery cells 100 may be directly connected in series, in parallel, or in mixed connection. Of course, the battery 1000 may also be a battery module composed of multiple battery cells 100 connected in series, in parallel, or in mixed connection, and the multiple battery modules are then connected in series, in parallel, or in mixed connection to form a whole. The battery 1000 may also include other structures. For example, the battery 1000 may also include a busbar component for realizing electrical connection between the multiple battery cells 100.

[0066] In the battery 1000, each battery cell 100 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 100 may be cylindrical, flat, rectangular or in other shapes.

[0067] The battery cell 100 provided in the embodiment of the present application is described below with reference to the accompanying drawings.

[0068] See also Figure 6 and Figure 7 , Figure 6 Schematic diagram of the exploded structure of a battery cell 100 provided in some embodiments of the present application, Figure 7 A schematic diagram of the structure of the adapter sheet 10, the electrode assembly 30 and the end cover 40 of the battery cell 100 provided in some embodiments of the present application.

[0069] A battery cell 100 provided in an embodiment of the present application includes a converter 10, an electrode terminal 20 and an electrode assembly 30, the electrode assembly 30 includes an electrode body 31 and a pole ear 32 connected to the electrode body 31; the converter 10 includes a first connection portion 11 electrically connected to the electrode terminal 20 and a second connection portion 12 electrically connected to the pole ear 32, the first connection portion 11 protrudes relative to the second connection portion 12 in a direction close to the electrode body 31, and the second connection portion 12 is connected to one side of the first connection portion 11 along the width direction D1 of the battery cell 100.

[0070] See also Figure 6 The electrode terminal 20 is used to be electrically connected to the electrode assembly 30 to output the electric energy of the battery cell 100 or input the electric energy to the battery cell 100. The electrode terminal 20 includes a positive electrode terminal 21 and a negative electrode terminal 22, and the positive electrode terminal 21 and the negative electrode terminal 22 are arranged at intervals. Specifically, the battery cell 100 is placed on a flat table, and its electrode terminal 20 is located at the top as a reference orientation. In the plane where the electrode terminal 20 is located, the arrangement direction of the positive electrode terminal 21 and the negative electrode terminal 22 is the length direction D2 of the battery cell 100, and the direction perpendicular to the length direction D2 of the battery cell 100 is the width direction D1 of the battery cell 100. The up and down direction is the height direction D3 of the battery cell 100. The width direction D1 of the battery cell 100, the length direction D2 of the battery cell 100, and the height direction D3 of the battery cell 100 are perpendicular to each other.

[0071] See also Figure 6 , it can be understood that the surface of the first connection part 11 facing away from the electrode body 31 is used to electrically connect with the electrode terminal 20, and the surface of the second connection part 12 facing the electrode body 31 is used to electrically connect with the pole ear 32. The first connection part 11 of the adapter 10 is protruded relative to the second connection part 12 in the direction close to the electrode body 31, which means that in the height direction D3 of the battery cell 100, the first connection part 11 protrudes from the surface of the second connection part 12 facing the electrode assembly 30. And, under the premise that the second connection part 12 is connected to one side of the first connection part 11 in the width direction D1 of the battery cell 100, the second connection part 12 can be connected to one end of the first connection part 11, that is, refer to Figure 6 The first connection part 11 and the second connection part 12 are flush at the same end of the length direction D2 of the battery cell 100; the second connection part 12 can also be connected to the middle of the first connection part 11. In addition, the first connection part 11 and the second connection part 12 can be integrally formed, or the first connection part 11 and the second connection part 12 can be separately formed and then assembled into a whole by laser welding or other methods.

[0072] The electrode assembly 30 is a component in the battery cell 100 where electrochemical reactions occur. The electrode assembly 30 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets with active materials constitute the electrode assembly 30, and the portions of the positive and negative electrode sheets without active materials each constitute a tab 32. During the charge and discharge process of the battery cell 100, the positive active material and the negative active material react with the electrolyte, and the tab 32 is electrically connected to the electrode terminal 20 through the adapter sheet 10 to form a current loop. The tab 32 includes a positive tab 321 and a negative tab 322. The positive tab 321 is connected to the positive electrode terminal 21 through a adapter sheet 10, and the negative tab 322 is connected to the negative electrode terminal 22 through a adapter sheet 10.

[0073] In the technical solution of the embodiment of this application, please refer to Figure 8 and Fig. 9 By setting the first connecting portion 11 to protrude in the direction close to the electrode body 31 relative to the second connecting portion 12, after the first connecting portion 11 is electrically connected to the electrode terminal 20 and the second connecting portion 12 is electrically connected to the pole tab 32, a partial structure of the electrode terminal 20 and a partial structure of the pole tab 32 are at the same height in the height direction D3 of the battery cell 100, and the electrode terminal 20, the pole tab 32 and the adapter sheet 10 are arranged relatively compactly in the height direction D3 of the battery cell 100, thereby improving the structural compactness of the battery cell 100.

[0074] On this basis, see Figure 8 and Fig. 9 In the technical solution of the embodiment of the present application, the second connecting portion 12 is configured to be connected to one side of the first connecting portion 11 along the width direction D1 of the battery cell 100. After such a configuration, even if the pole ear 32 is larger in the length direction D2 of the battery cell 100 due to misalignment, the pole ear 32 will only be connected to the second connecting portion 12 and will not abut the first connecting portion 11, which can prevent the pole ear 32 from folding, thereby reducing the risk of short circuit in the electrode assembly 30 and improving the safety performance of the battery cell 100.

[0075] Also, see Figure 8 and Fig. 9The second connection portion 12 is set to be connected to one side of the first connection portion 11 along the width direction D1 of the battery cell 100, and the size of the second connection portion 12 in the length direction D2 of the battery cell 100 is not limited by the first connection portion 11, that is, the size of the second connection portion 12 in the length direction D2 of the battery cell 100 can be equal to the maximum limit size of the connecting plate in the length direction D2 of the battery cell 100. In this way, it can be ensured as much as possible that the second connection portion 12 has sufficient length to be electrically connected to the tab 32, which is beneficial to enhancing the stability of the electrical connection between the tab 32 and the adapter 10.

[0076] See also Figure 6 In some embodiments, the battery cell 100 may further include a shell, which is used to provide an internal environment for the battery cell 100, and the internal environment may be used to accommodate the adapter 10, the electrode assembly 30, the electrolyte and other components. The shell includes an end cap 40 and a shell 50. The shell 50 has the above-mentioned internal environment formed inside, and the shell 50 may be an independent component, and an opening may be provided on the shell 50. The end cap 40 is provided at the opening of the shell 50 to isolate the internal environment of the battery cell 100 from the external environment. Specifically, the shell 50 and the end cap 40 may form a common connection surface before other components are put into the shell, and when the interior of the shell 50 needs to be encapsulated, the end cap 40 is provided at the opening of the shell 50. Optionally, the shell 50 may be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. The shape of the end cap 40 may be adapted to the shape of the shell 50 to match the shell 50. The electrode terminal 20 may be provided on the end cap 40 or on any wall of the shell 50.

[0077] In some embodiments, the battery cell 100 may further include a pressure relief mechanism, which is disposed on the end cap 40 and is used to release the internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold. In the length direction D2 of the battery cell 100, the positive electrode terminal 21 and the negative electrode terminal 22 may be located on both sides of the pressure relief mechanism or on the same side of the pressure relief mechanism.

[0078] See also Figure 6 and Figure 8 In some embodiments, the number of the second connection portions 12 is two, and the two second connection portions 12 are disposed at opposite sides of the first connection portion 11 along the width direction D1 of the battery cell 100 .

[0079] In the technical solution of the embodiment of the present application, the two second connecting parts 12 can be electrically connected to the two electrode assemblies 30 respectively, so as to realize the parallel connection of the two electrode assemblies 30, thereby realizing the capacity increase of the battery cell 100; and, the tabs 32 of the two electrode assemblies 30 are not prone to folding, and the safety performance of the battery cell 100 is better.

[0080] See also Figure 8 In some embodiments, the two second connection portions 12 are spaced apart from each other to form an escape space 121 .

[0081] In the technical solution of the embodiment of the present application, the two second connection parts 12 are arranged at intervals, and the space between the two second connection parts 12 is not completely occupied by the first connection part 11, and an avoidance space 121 is also formed between the two second connection parts 12. The avoidance space 121 can avoid the injection hole and other structures of the battery cell 100, which is beneficial to improving the structural compactness of the battery cell 100.

[0082] See also Figures 8 to 17 In some embodiments, the first connecting portion 11 includes a first plate body 111 and a first flange 112 . The first plate body 111 is protruded relative to the second connecting portion 12 toward the electrode body 31 , and the first flange 112 is connected between the second connecting portion 12 and the first plate body 111 .

[0083] In the technical solution of the embodiment of the present application, the first flange 112 can isolate the electrode terminal 20 and the pole lug 32, thereby reducing the risk of short circuit caused by direct electrical connection between the electrode terminal 20 and the pole lug 32; and the first flange 112 can position the electrode terminal 20 in the width direction D1 of the battery cell 100, which is conducive to quickly aligning the electrode terminal 20 with the first connecting portion 11, thereby improving the assembly efficiency of the electrode terminal 20 and the first connecting portion 11.

[0084] See also Fig.12 In some embodiments, the angle A between the first flange 112 and the first plate body 111 is an obtuse angle, for example, 92°, 95°, 100°, 105°, 110°, 115°, 120°, 130° or 140°.

[0085] In the technical solution of the embodiment of the present application, during the process of producing or assembling the adapter sheets 10, multiple adapter sheets 10 can be loaded together in a stacked state to improve the loading efficiency; and, by designing parameters such as the thickness of the first flange 112, the size of the angle A between the first flange 112 and the first plate body 111, and the thickness of the second connecting portion 12, when the multiple adapter sheets 10 are in a stacked state, a certain gap H is maintained between the second connecting portions 12 of two adjacent adapter sheets 10 to avoid the second connecting portions between two adjacent adapter sheets 10 from fitting together, thereby avoiding the situation where multiple adapter sheets 10 need to be taken away due to the fit between two adjacent adapter sheets 10 when a single adapter sheet 10 needs to be taken away, thereby improving the efficiency of the material taking, assembly and other processes.

[0086] See also Fig.10 , Fig.11 , Figures 13 to 15as well as Fig.17 In some embodiments, the first connecting portion 11 includes a second flange 113 , which is connected to one side of the first plate 111 along the length direction D2 of the battery cell 100 , and one end of the second flange 113 along the width direction D1 of the battery cell 100 is connected to the first flange 112 .

[0087] It should be noted that when the number of the first connection parts 11 is two, both ends of the second flange 113 along the width direction D1 of the battery cell 100 are respectively connected to the two first flanges 112 .

[0088] In the technical solution of the embodiment of the present application, the second flange 113 can isolate the electrode terminal 20 and the pole lug 32, thereby reducing the risk of short circuit caused by direct electrical connection between the electrode terminal 20 and the pole lug 32; and the second flange 113 can position the electrode terminal 20 in the length direction D2 of the battery cell 100, which is conducive to quickly aligning the electrode terminal 20 with the first connecting part 11, thereby improving the assembly efficiency of the electrode terminal 20 and the first connecting part 11.

[0089] See also Fig.13 In some embodiments, the angle B between the second flange 113 and the first plate body 111 is an obtuse angle, for example, 92°, 95°, 100°, 105°, 110°, 115°, 120°, 130°, 140°, etc.

[0090] In the technical solution of the embodiment of the present application, when the angle B between the first flange 112 and the second flange 113 and the first plate body 111 is set to an obtuse angle, in the process of producing or assembling the adapter sheet 10, multiple adapter sheets 10 can be centrally loaded in a stacked state to improve the loading efficiency; and, by designing parameters such as the thickness of the first flange 112, the thickness of the second flange 113, the size of the angle A between the first flange 112 and the first plate body 111, the size of the angle B between the second flange 113 and the first plate body 111, and the thickness of the second connecting portion 12, when multiple adapter sheets 10 are in a stacked state, a certain gap H is maintained between the second connecting portions 12 of two adjacent adapter sheets 10 to avoid the second connecting portions between two adjacent adapter sheets 10 from fitting together, thereby avoiding the situation where multiple adapter sheets 10 need to be taken away due to the fit of two adjacent adapter sheets 10 when a single adapter sheet 10 needs to be taken away, thereby improving the efficiency of processes such as material removal and assembly.

[0091] See also Fig.10 , Fig.11 , Fig.16 and Fig.17 In some embodiments, the adapter sheet 10 further includes a second plate body 13 , and the second plate body 13 is connected between the second connecting portion 12 and the second flange 113 .

[0092] In the technical solution of the embodiment of the present application, a second plate body 13 is arranged between the second connecting part 12 and the second flange 113, so as to enhance the structural strength of the first connecting part 11 and the second connecting part 12, and to avoid deformation of the first connecting part 11 during electrical connection with the electrode terminal 20 as much as possible, and to avoid deformation of the second connecting part 12 during electrical connection with the pole ear 32 as much as possible; and, in the case where the second plate body 13 is arranged between the second connecting part 12 and the second flange 113, neither the first flange 112 nor the second flange 113 is at the edge of the adapter 10, so that the first connecting part 11 including the first flange 112, the second flange 113 and the first plate body 111 can be directly stamped out on a single plate body by a stamping process, which is conducive to simplifying the production process and production cost of the adapter 10.

[0093] In some embodiments, the first connection portion 11 and the second connection portion 12 are integrally formed. Such a configuration can reduce the contact resistance of the adapter 10 and improve the current transmission efficiency, thereby improving the performance and efficiency of the battery cell 100; it can also reduce the possibility of breakage of the adapter 10 and improve the structural stability and reliability of the adapter 10. In addition, the integral formation of the first connection portion 11 and the second connection portion 12 can also simplify the production process of the adapter 10, reduce the production steps and assembly time, and reduce production costs.

[0094] See also Figure 6 The present embodiment further provides a battery cell 100 , which includes a switching piece 10 , an electrode terminal 20 , an electrode assembly 30 , an end cover 40 , and a shell 50 .

[0095] There are two adapter plates 10, see FIG. Fig.10 and Fig.11 Each adapter sheet 10 includes a first connection portion 11, a second plate body 13 and two second connection portions 12. The first connection portion 11 includes a first plate body 111, a second flange 113 and two first flanges 112. The first plate body 111 is rectangular in shape. The first plate body 111 is protruded toward the electrode body 31 relative to the second connection portion 12 and is connected between the two second connection portions 12 through the two first flanges 112. The second flange 113 is connected to one side of the first plate body 111 in the length direction D2 of the battery cell 100, and the two ends of the second flange 113 along the width direction D1 of the battery cell 100 are respectively connected to the two first flanges 112. Please refer to Fig.12 The angle A between the first flange 112 and the first plate body 111 is 120°, see Fig.13 The included angle B between the second flange 113 and the first plate body 111 is 120°. The second plate body 13 is connected between the second flange 113 and the two second connecting portions 12 .

[0096] See also Figure 6 The electrode terminal 20 includes a positive electrode terminal 21 and a negative electrode terminal 22 . The positive electrode terminal 21 and the negative electrode terminal 22 are both disposed on the end cover 40 . In the length direction D2 of the battery cell 100 , the positive electrode terminal 21 and the negative electrode terminal 22 are spaced apart.

[0097] See also Figure 6 There are two electrode assemblies 30, each electrode assembly 30 includes an electrode body 31 and a positive electrode ear 321 and a negative electrode ear 322 connected to the electrode body 31, the positive electrode ears 321 of the two electrode assemblies 30 are respectively electrically connected to the two second connecting parts 12 of the same adapter sheet 10, and the negative electrode ears 322 of the two electrode assemblies 30 are respectively electrically connected to the two second connecting parts 12 of another adapter sheet 10.

[0098] The shell 50 and the end cover 40 are formed together to accommodate the adapter plate 10, the electrode assembly 30 and the internal environment.

[0099] See also Figure 5 The embodiment of the present application further provides a battery 1000, and the battery 1000 includes the battery cell 100 described in the above embodiment.

[0100] Since the battery 1000 includes the battery cell 100 described above, the risk of short circuit inside the battery 1000 can be reduced, which is beneficial to improving the safety of the battery 1000 .

[0101] See also Figure 4 , an embodiment of the present application further provides an electrical device, the electrical device comprising the battery cell 100 described in the above embodiment or the battery 1000 described in the above embodiment.

[0102] Since the electrical equipment includes the battery cell 100 or the battery 1000 described in the above embodiment, the risk of short circuit inside the electrical equipment can be reduced, which is beneficial to improving the safety of the electrical equipment.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises: Electrode terminal; An electrode assembly, comprising an electrode body and an electrode ear connected to the electrode body; The adapter includes a first connection portion electrically connected to the electrode terminal and a second connection portion electrically connected to the electrode tab, the first connection portion protruding relative to the second connection portion in a direction close to the electrode body, and the second connection portion is connected to one side of the first connection portion along the width direction of the battery cell.

2. The battery cell according to claim 1, characterized in that: The number of the second connection parts is two, and the two second connection parts are arranged at two opposite sides of the first connection part along the width direction of the battery cell.

3. The battery cell according to claim 2, characterized in that: The two second connection parts are spaced apart from each other to form an escape space.

4. The battery cell according to claim 1, characterized in that: The first connecting portion includes a first plate body and a first flange. The first plate body is protruded relative to the second connecting portion toward the electrode body. The first flange is connected between the second connecting portion and the first plate body.

5. The battery cell according to claim 4, characterized in that: An angle between the first flange and the first plate body is an obtuse angle.

6. The battery cell according to claim 4 or 5, characterized in that: The first connection portion includes a second flange, the second flange is connected to one side of the first plate along the length direction of the battery cell, and one end of the second flange along the width direction of the battery cell is connected to the first flange.

7. The battery cell according to claim 6, characterized in that: An angle between the second flange and the first plate is an obtuse angle.

8. The battery cell according to claim 6, characterized in that: The adapter plate further includes a second plate body, and the second plate body is connected between the second connecting portion and the second flange.

9. The battery cell according to claim 1, characterized in that: The first connection portion and the second connection portion are integrally formed.

10. A battery, characterized in that: The battery comprises the battery cell according to any one of claims 1 to 9.

11. An electrical device, characterized in that: The electrical device comprises the battery cell according to any one of claims 1 to 9, or the electrical device comprises the battery according to claim 10.

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