Battery monomer, battery and electric equipment

Abstract

The utility model provides a battery monomer, a battery and electric equipment. The battery cell comprises: a housing having an accommodating cavity; the at least two electrode assemblies are located in the containing cavity, any one of the at least two electrode assemblies comprises a main body part, a first tab and a second tab, the first tab and the second tab are led out from the main body part and are opposite in polarity, and the battery single body comprises a first side and a second side which are oppositely arranged in the height direction of the battery single body; the at least two electrode assemblies comprise a first electrode assembly and a second electrode assembly, a first tab and a second tab are led out from the first side of the main body part of the first electrode assembly, a first tab is led out from the second side, a second tab is led out from the first side of the main body part of the second electrode assembly, and a second tab is led out from the second side of the main body part of the second electrode assembly; in the first electrode assembly and the second electrode assembly, the two second tabs located on the first side are electrically connected with each other, and the two first tabs located on the second side are electrically connected with each other. The safety performance of the battery monomer can be improved.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202210147969.6, filed on February 17, 2022, entitled “Battery Cell, Battery, Electrical Equipment and Manufacturing Method,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of batteries, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] 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 in their development.

[0005] In order to make a large-capacity battery cell, two or more electrode assemblies are usually set in the battery cell, and the two or more electrode assemblies are connected in parallel. However, when multiple electrode assemblies are set in the battery cell, the multiple electrode assemblies will generate a lot of heat, and the battery cell will cause safety problems due to insufficient heat dissipation. Summary of the invention

[0006] In view of the above problems, the present application provides a battery cell, a battery, and an electrical device, aiming to improve the heat dissipation performance of the battery cell and thus improve its safety performance.

[0007] In a first aspect, the present application provides a battery cell, comprising: a shell having a accommodating cavity; at least two electrode assemblies, located in the accommodating cavity, any one of the at least two electrode assemblies comprising a main body and a first pole ear and a second pole ear with opposite polarities extending from the main body, wherein the battery cell comprises a first side and a second side arranged opposite to each other in a height direction thereof, at least two electrode assemblies comprising a first electrode assembly and a second electrode assembly, the main body of the first electrode assembly having the first pole ear and the second pole ear extending on the first side and the first pole ear extending on the second side, the main body of the second electrode assembly having the second pole ear extending on the first side and the first pole ear extending on the second side, and in the first electrode assembly and the second electrode assembly, the two second pole ears located on the first side are electrically connected to each other, and the two first pole ears located on the second side are electrically connected to each other.

[0008] In the technical solution of the embodiment of the present application, the battery cell includes a shell and an electrode assembly located in the accommodating cavity of the shell. The electrode assembly includes a first electrode assembly and a second electrode assembly, and the first electrode assembly and the second electrode assembly each include a first pole lug and a second pole lug. The two second pole lugs located on the first side are connected to each other, and the two first pole lugs located on the second side are connected to each other, so that the first electrode assembly and the second electrode assembly can be connected in parallel with each other. And the interconnected first pole lugs and the interconnected second pole lugs are located on different sides of the electrode cell, which can simplify the wiring, avoid the risk of short circuit between the wires connecting the two first pole lugs and the wires connecting the two second pole lugs, and improve the safety performance of the battery cell. In addition, the two first pole lugs located on the second side can be connected to the first pole lug located on the first side of the first electrode assembly, so that the first pole lug and the second pole lug with opposite polarity on the battery cell can be led out on the first side of the battery cell, which can simplify the wiring of the battery cell.

[0009] In some embodiments, the shell also includes a wall portion, which encloses a accommodating cavity and an opening that is connected to the accommodating cavity and is located at least on the first side; the battery cell also includes an end cap assembly for closing the opening, the end cap assembly includes an end cap body and a first electrode terminal and a second electrode terminal with opposite polarities that are arranged on the end cap body, the first electrode terminal is electrically connected to the first pole ear located on the first side, and the second electrode terminal is electrically connected to at least one of the two second pole ears.

[0010] According to an embodiment of the present application, an end cap assembly is provided at the opening of the housing, and a first electrode terminal and a second electrode terminal are provided on the end cap assembly, so that the first electrode terminal is connected to the first pole lug to lead out the first pole lug, and the second electrode terminal is connected to the second pole lug to lead out the second pole lug. The opening is located on the first side, that is, the end cap assembly is located on the first side, so that the distance between the first pole lug and the first electrode terminal, and the distance between the second pole lug and the second electrode terminal on the first side can be reduced.

[0011] In some embodiments, the wall portion includes a bottom portion disposed opposite to the opening, and at least a portion of the at least one first electrode tab located on the second side is in direct or indirect contact with the bottom portion.

[0012] According to the embodiment of the present application, by making the first pole tab abut against the bottom, the heat on the first pole tab can be transferred to the bottom, thereby improving the heat dissipation capacity of the battery cell.

[0013] In some embodiments, at least one of the two first electrode tabs located on the second side is bent to form a supporting portion, and a surface of the supporting portion facing the bottom is a matching surface that abuts against the bottom.

[0014] According to the embodiment of the present application, by forming a mating surface on the abutting portion of the first pole ear, the heat dissipation area of ​​the first pole ear can be increased, thereby accelerating the heat transfer speed between the first pole ear and the bottom, and further improving the heat dissipation capacity of the battery cell.

[0015] In some embodiments, a first transition component is further included, and the two first electrode tabs located on the second side are connected to each other through the first transition component.

[0016] According to an embodiment of the present application, by providing a first transition component, the two first electrode tabs on the second side can be connected, and the heat of the two first electrode tabs can be transferred to the first transition component.

[0017] In some embodiments, the first transition component is located between the two first tabs and the bottom of the second side, so that the mating surfaces abut against each other through the first transition component and the bottom.

[0018] According to the embodiment of the present application, the mating surface is in contact with the bottom through the first adapter component, so that heat can be transferred from the first pole tab to the bottom through the first adapter component. The first adapter component connects the two first pole tabs, so that both first pole tabs can transfer heat to the bottom through the first adapter component, which can further improve the heat dissipation capacity of the battery cell.

[0019] In some embodiments, an insulating heat conductive plate is provided on the side of the bottom facing the accommodating cavity, and at least a portion of the insulating heat conductive plate is located between the first adapter component and the bottom to achieve heat conduction between the first adapter component and the bottom.

[0020] According to the embodiments of the present application, by providing an insulating heat-conducting plate, the heat transfer speed between the first adapter component and the bottom can be accelerated, thereby improving the heat dissipation capacity of the battery cell.

[0021] In some embodiments, the insulating heat-conducting plate and the first adapter component are bonded to each other by insulating heat-conducting adhesive. The insulating heat-conducting adhesive can ensure the stability of the relative position between the insulating heat-conducting plate and the first adapter component.

[0022] In some embodiments, the insulating heat-conducting plate and the bottom are bonded to each other by insulating heat-conducting adhesive. The insulating heat-conducting adhesive can ensure the stability of the relative position between the insulating heat-conducting plate and the bottom.

[0023] In some embodiments, the main body of the first electrode assembly and the main body of the second electrode assembly each include two first surfaces arranged opposite to each other and a second surface connecting the two first surfaces and arranged opposite to each other, the area of ​​the first surface is greater than the area of ​​the second surface, and the first electrode assembly and the second electrode assembly are arranged side by side opposite to each other through the second surface.

[0024] According to the embodiment of the present application, the first electrode assembly and the second electrode assembly are arranged side by side through the second surface with a smaller area, so that the first surface can be not blocked by other electrode assemblies, and the heat of the electrode assembly can be dissipated through the first surface. In addition, the area of ​​the first surface is larger, which can improve the heat dissipation capacity of the electrode assembly.

[0025] In some embodiments, in the first electrode tab and the second electrode tab located on the first side of the first electrode assembly, the second electrode tab is located on a side of the first electrode tab facing the second electrode assembly.

[0026] According to an embodiment of the present application, the second electrode tab on the first electrode assembly is disposed close to the second electrode assembly, so that the distance between the two second electrode tabs located on the first side is shorter, which facilitates the connection of the two second electrode tabs.

[0027] In some embodiments, the first electrode assembly and the second electrode assembly are electrode assemblies formed by winding, and include a straight region and a bent region. Among the two first electrode ears located on the second side, the first electrode ear of the first electrode assembly is located in the straight region of the first electrode assembly, and / or the first electrode ear of the second electrode assembly is located in the straight region of the second electrode assembly.

[0028] According to an embodiment of the present application, when the first pole tab on the second side is located in the straight region of the first electrode assembly and / or the second electrode assembly, the shape of the first pole tab can be ensured to be regular. In addition, when the first pole tab is bent to form an abutment portion, the bending difficulty of the first pole tab can be reduced.

[0029] In some embodiments, among the two first electrode ears located on the second side, the width L1 of the first electrode ear of the first electrode assembly and the width L2 of the straight area of ​​the first electrode assembly satisfy 5mm≤L2-L1≤10mm; and / or the width L3 of the first electrode ear of the second electrode assembly and the width L4 of the straight area of ​​the second electrode assembly satisfy 5mm≤L4-L3≤10mm.

[0030] According to an embodiment of the present application, when the width L1 of the first pole tab and the width L2 of the straight area of ​​the first electrode assembly satisfy 5mm≤L2-L1≤10mm, even if the first pole tab is offset due to a process error, it is still possible to ensure that the first pole tab is located in the straight area of ​​the first electrode assembly. Similarly, when the width L3 of the second pole tab and the width L4 of the straight area of ​​the second electrode assembly satisfy 5mm≤L4-L3≤10mm, even if the second pole tab is offset due to a process error, it is still possible to ensure that the second pole tab is located in the straight area of ​​the second electrode assembly.

[0031] In some embodiments, the first electrode assembly and the second electrode assembly are both laminated electrode assemblies, and among the two first electrode ears located on the second side, the width L5 of the first electrode ear of the first electrode assembly and the width L6 of the first electrode assembly satisfy 0≤L6-L5≤10mm; and / or, the width L7 of the first electrode ear of the second electrode assembly and the width L8 of the second electrode assembly satisfy 0≤L8-L6≤10mm.

[0032] According to the embodiment of the present application, when L5 and L6 meet the above range, it can be ensured that the first electrode tab does not extend out of the overlapping area.

[0033] In some embodiments, there are multiple second electrode assemblies, and the second electrode tab of each second electrode assembly is located on the first side and electrically connected to the second electrode tab of the first electrode assembly, and the first electrode tab of each second electrode assembly is located on the second side and electrically connected to the first electrode tab on the first side of the first electrode assembly.

[0034] According to an embodiment of the present application, by providing a plurality of second electrode assemblies, the capacity of the battery cell can be increased. The second electrode tabs of each second electrode assembly are connected to the second electrode tab of the first electrode assembly, and the plurality of first electrode tabs on the first side are connected to each other, so that the plurality of second electrode assemblies can be connected in parallel with the first electrode assembly.

[0035] In some embodiments, among the two first pole ears located on the second side, the orthographic projection of the first pole ear of the first electrode assembly along the height direction is located within the orthographic projection of the main body of the first electrode assembly along the height direction, and the orthographic projection of the first pole ear of the second electrode assembly along the height direction is located within the orthographic projection of the main body of the second electrode assembly along the height direction.

[0036] In the embodiment of the present application, the first pole ear of the first electrode assembly does not protrude from the body of the first electrode assembly, and the first pole ear of the second electrode assembly does not protrude from the body of the second electrode assembly, thereby preventing the first pole ear from scratching the inner wall surface of the shell facing the accommodating cavity.

[0037] In some embodiments, the first electrode assembly and the second electrode assembly both include a first electrode plate, a second electrode plate, and a diaphragm located between the first electrode plate and the second electrode plate. In the first electrode assembly and / or the second electrode assembly, along the height direction, the first electrode ear extends from the first electrode plate and exceeds the diaphragm, and the second electrode ear extends from the second electrode plate and exceeds the diaphragm.

[0038] According to an embodiment of the present application, the first electrode tab extends out of the diaphragm, and when the first electrode tab includes multiple layers of segments, the stability of the electrical connection between the multiple layers of segments can be ensured. Similarly, the second electrode tab extends out of the diaphragm, and when the second electrode tab includes multiple layers of segments, the stability of the electrical connection between the multiple layers of segments can be ensured.

[0039] In a second aspect, the present application provides a battery, comprising the battery cell provided in the first aspect of the present application.

[0040] In a third aspect, the present application provides an electrical device, comprising the battery provided in the second aspect of the present application.

[0041] The present application provides a battery cell, a battery, and an electrical device. The battery cell includes a shell and an electrode assembly located in a housing cavity of the shell. The two second pole ears located on the first side are connected to each other, and the two first pole ears located on the second side are connected to each other, so that the first electrode assembly and the second electrode assembly can be connected in parallel with each other. And the first pole ears connected to each other and the second pole ears connected to each other are located on different sides of the electrode cell, which can simplify the structure of the battery cell, avoid the risk of short circuit between the components connecting the two first pole ears and the components connecting the two second pole ears, and improve the safety performance of the battery cell. The first pole ears connected to each other and the second pole ears connected to each other are located on different sides of the electrode cell, so that the two can dissipate heat from different sides, which can effectively improve the heat dissipation performance of the battery cell, and thus improve the safety performance of the battery cell. In addition, the two first pole ears located on the second side can be connected to the first pole ears located on the first side of the first electrode assembly, so that the first pole ears and the second pole ears with opposite polarities on the battery cell can be led out on the first side of the battery cell, which can simplify the wiring of the battery cell.

[0042] 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

[0043] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0044] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0045] Figure 2 is a schematic diagram of the structure of a battery pack provided in one embodiment of the present application;

[0046] Figure 3 is a schematic structural diagram of a battery module provided in one embodiment of the application;

[0047] Figure 4 is a schematic diagram of a three-dimensional structure of a battery cell provided in one embodiment of the present application;

[0048] Figure 5 is a schematic diagram of a three-dimensional structure of a battery cell provided by an embodiment of the present application at another viewing angle;

[0049] Figure 6 is a schematic diagram of the exploded structure of a battery cell provided in one embodiment of the present application;

[0050] Figure 7 is a schematic structural diagram of an electrode assembly of a battery cell provided by an embodiment of the present application from another viewing angle;

[0051] Figure 8 A first electrode assembly of a battery cell provided in an embodiment of the present application is Figure 7 Sectional view at AA in the middle;

[0052] Fig. 9 It is a schematic flow chart of a method for manufacturing a battery cell according to an embodiment of the present application.

[0053] The reference numerals in the specific implementation manner are as follows:

[0054] 1 vehicle, 10 battery, 11 controller, 12 motor;

[0055] 20 battery module, 200 battery cell, 210 end cap assembly, 211 end cap body; 212 first electrode terminal, 213 second electrode terminal; 220 shell, 221 accommodating cavity; 222 wall, 222a bottom; 222b side; 223 opening; 230 electrode assembly; 230a first electrode assembly; 230b second electrode assembly; 231 main body; 231a first surface; 231b second surface; 232 first pole ear; 232a abutting portion; s1 mating surface; 233, second pole ear; 234 first pole piece; 235 second pole piece; 236 diaphragm; 240 first transition component; 250 insulating heat conductive plate; 260 second transition component; 270 support portion;

[0056] 30 box body, 301 first box body part, 302 second box body part;

[0057] A1, first side; A2, second side; Q, straight area; W, bending area

[0058] Z, height direction; X, width direction; Y, thickness direction. DETAILED DESCRIPTION

[0059] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0060] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0061] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0062] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0063] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0064] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0065] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0066] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0067] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0068] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. A battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive current collector and a positive electrode ear connected to the positive current collector. The positive current collector is coated with a positive active material layer, and the positive electrode ear is not coated with a positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, the negative active material layer is coated on the surface of the negative current collector; the negative current collector includes a negative current collector and a negative electrode tab connected to the negative current collector, the negative current collector is coated with the negative active material layer, and the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, the negative active material layer includes a negative active material, and the negative active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0069] In order to make a large-capacity battery cell, two or more electrode assemblies are usually set in the battery cell, and the two or more electrode assemblies are connected in parallel. The inventor of the present application noticed that when a battery cell is provided with multiple electrode assemblies, the multiple electrode assemblies will generate a lot of heat, and the heat dissipation performance of the battery cell is insufficient, which may cause safety problems.

[0070] In order to improve the heat dissipation performance and safety performance of the battery cell, the applicant has found that the electrode assembly includes a first pole ear and a second pole ear with opposite polarities, and the first pole ear and the second pole ear can be connected on different sides of the electrode assembly, respectively, so that the connection of multiple first pole ears and the multiple second pole ears can dissipate heat on different sides of the battery cell, thereby improving the problem of heat concentration in the battery cell and improving the heat dissipation performance and safety performance of the battery cell.

[0071] Based on the above considerations, the inventor has designed a battery cell after in-depth research. The battery cell includes a first side and a second side arranged opposite to each other in the height direction. The electrode assembly includes a first pole tab and a second pole tab with opposite polarities, and multiple electrode assemblies are each led out with a second pole tab on the first side, and multiple electrode assemblies are each led out with a first pole tab on the second side. The second pole tabs of multiple electrode assemblies are connected to the first side, and the first pole tabs of multiple electrode assemblies are connected to the second side.

[0072] In such a battery cell, the multiple second pole tabs located on the first side are connected to each other, and the multiple first pole tabs located on the second side are connected to each other, so that the first electrode assembly and the second electrode assembly can be connected in parallel. The interconnected first pole tabs and the interconnected second pole tabs are located on different sides of the electrode cell, so that the connection of the multiple first pole tabs and the multiple second pole tabs on different sides of the battery cell can dissipate heat at the same time, thereby improving the problem of heat concentration in the battery cell and improving the heat dissipation performance and safety performance of the battery cell.

[0073] In addition, the inventors found that for square shell batteries, in order to prepare large-capacity single cells, more than two electrode assemblies are usually set in the battery cell. When the electrode assemblies are stacked along the thickness direction, the overall thickness of the single cell is too large, which is not conducive to heat dissipation, reduces the battery life, and increases safety risks; when the length or width of a single electrode assembly is increased, the electrode assembly preparation process affects the production speed and quality rate due to the long stroke, and will cause the electrode assembly to absorb the electrolyte with difficulty, causing safety problems such as lithium precipitation. Therefore, the present application proposes a long and thin large-capacity single cell, and by arranging more than two electrode assemblies side by side along the length or width direction and connecting them in parallel, it can not only meet the needs of large-capacity single cells, but also effectively improve the heat dissipation effect of single cells.

[0074] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0075] The electrical device may be 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 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, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as 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, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0076] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the batteries and electrical equipment described above, but can also be applied to all batteries including a box and electrical equipment using the battery. However, for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0077] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1 provided for some embodiments of the present application. The vehicle 1 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 10 is provided inside the vehicle 1, and the battery 10 may be provided at the bottom, the head or the tail of the vehicle 1. The battery 10 may be used to power the vehicle 1, for example, the battery 10 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 11 and a motor 12, and the controller 11 is used to control the battery 10 to power the motor 12, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0078] In some embodiments of the present application, the battery 10 can be used not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0079] In order to meet different power requirements, the battery 10 may include a plurality of battery cells, which refers to the smallest unit that constitutes a battery module or a battery pack. A plurality of battery cells can be connected in series and / or in parallel via electrode terminals for use in various applications. The battery mentioned in the present application includes a battery module or a battery pack. Among them, a plurality of battery cells can be connected in series, in parallel, or in mixed connection, and mixed connection refers to a mixture of series and parallel connection. In the embodiments of the present application, a plurality of battery cells can directly constitute a battery pack, or they can first constitute a battery module, and then the battery module constitutes a battery pack.

[0080] Figure 2 A schematic structural diagram of a battery 10 according to an embodiment of the present application is shown.

[0081] like Figure 2 As shown, the battery 10 includes a box body 30 and a battery cell (not shown), and the battery cell 200 is accommodated in the box body 30 .

[0082] The box 30 can be a simple three-dimensional structure such as a single cuboid, cylinder or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres, which is not limited in the present embodiment. The box 30 can be made of alloy materials such as aluminum alloy, iron alloy, polymer materials such as polycarbonate, polyisocyanurate foam plastic, or composite materials such as glass fiber and epoxy resin, which is not limited in the present embodiment.

[0083] The box 30 is used to accommodate the battery cell 200, and the box 30 can be a variety of structures. In some embodiments, the box 30 may include a first box portion 301 and a second box portion 302, the first box portion 301 and the second box portion 302 cover each other, and the first box portion 301 and the second box portion 302 jointly define a storage space for accommodating the battery cell 200. The second box portion 302 may be a hollow structure with one end open, the first box portion 301 is a plate-like structure, and the first box portion 301 covers the open side of the second box portion 302 to form a box 30 with a storage space; the first box portion 301 and the second box portion 302 may also be a hollow structure with one side open, and the open side of the first box portion 301 covers the open side of the second box portion 302 to form a box 30 with a storage space. Of course, the first box portion 301 and the second box portion 302 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0084] In order to improve the sealing performance after the first box body 301 and the second box body 302 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 301 and the second box body 302 .

[0085] Assuming that the first box body portion 301 covers the top of the second box body portion 302 , the first box body portion 301 can also be referred to as an upper box cover, and the second box body portion 302 can also be referred to as a lower box body 30 .

[0086] In the battery 10, there can be one or more battery cells 200. If there are more than one battery cell 200, the battery cells 200 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that the battery cells 200 are both connected in series and in parallel. The battery cells 200 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the battery cells 200 is accommodated in the box 30; of course, the battery modules 20 can also be formed by connecting the battery cells 200 in series, in parallel, or in a mixed connection, and then the battery modules 20 are connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the box 30.

[0087] See also Figure 2 and Figure 3 , Figure 3 A schematic structural diagram of a battery module 20 according to an embodiment of the present application is shown.

[0088] In some embodiments, Figure 2 and Figure 3 As shown, there are multiple battery cells 200, and the multiple battery cells 200 are first connected in series, in parallel, or in mixed series to form a battery module 20. The multiple battery modules 20 are then connected in series, in parallel, or in mixed series to form a whole, and are accommodated in the box 30.

[0089] The multiple battery cells 200 in the battery module 20 can be electrically connected through a busbar component to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 200 in the battery module 20 .

[0090] In the present application, the battery cell 200 may include a lithium-ion battery cell 200, a sodium-ion battery cell 200, or a magnesium-ion battery cell 200, etc., and the embodiments of the present application do not limit this. The battery cell 200 may be cylindrical, flat, rectangular, or in other shapes, etc., and the embodiments of the present application do not limit this. The battery cell 200 is generally divided into three types according to the packaging method: cylindrical battery cells 200, square battery cells 200, and soft-pack battery cells 200, and the embodiments of the present application do not limit this. However, for the sake of simplicity, the following embodiments are all described using square battery cells 200 as an example.

[0091] Figure 4 It is a schematic diagram of the three-dimensional structure of a battery cell 200 provided in one embodiment of the present application. Figure 5 It is a schematic diagram of the three-dimensional structure of a battery cell 200 provided in one embodiment of the present application at another viewing angle. Figure 5 and Figure 4 The viewing direction is opposite. Figure 6 is a schematic diagram of an exploded structure of a battery cell 200 provided in one embodiment of the present application; Figure 7 It is a schematic structural diagram of an electrode assembly 230 of a battery cell 200 provided in one embodiment of the present application from another perspective.

[0092] like Figures 4 to 7 As shown, the battery cell 200 includes: a shell 220 having a receiving cavity 221; at least two electrode assemblies 230, which are located in the receiving cavity 221, and any of the at least two electrode assemblies 230 includes a main body 231 and a first pole ear 232 and a second pole ear 233 with opposite polarities extending from the main body 231, wherein the battery cell 200 includes a first side A1 and a second side A2 which are arranged oppositely in the height direction Z thereof, and the at least two electrode assemblies 230 include a first electrode assembly 230a and a second electrode assembly 230b, The main body 231 of the first electrode assembly 230a has a first pole tab 232 and a second pole tab 233 led out on the first side A1, and a first pole tab 232 led out on the second side A2. The main body 231 of the second electrode assembly 230b has a second pole tab 233 led out on the first side A1, and a first pole tab 232 led out on the second side A2. In the first electrode assembly 230a and the second electrode assembly 230b, the two second pole tabs 233 located on the first side A1 are electrically connected to each other, and the two first pole tabs 232 located on the second side A2 are electrically connected to each other.

[0093] The housing 220 is a component for forming a housing cavity 221 for accommodating the battery cell 200, wherein the formed housing cavity 221 can be used to accommodate the electrode assembly 230, the electrolyte (not shown in the figure) and other components. Specifically, the shape of the housing 220 can be determined according to the specific shape and size of the electrode assembly 230. The material of the housing 220 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0094] The electrode assembly 230 is a component in the battery cell 200 where an electrochemical reaction occurs. Two or more electrode assemblies 230 may be included in the housing 220. The electrode assembly 230 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 portion of the positive electrode sheet and the negative electrode sheet with active materials constitutes the main body 231 of the electrode assembly 230, and the portion of the positive electrode sheet and the negative electrode sheet without active materials each constitutes a first pole ear 232 and a second pole ear 233. For example, the portion of the positive electrode sheet without active materials constitutes the first pole ear 232, and the first pole ear 232 is the positive pole ear, and the portion of the negative electrode sheet without active materials constitutes the second pole ear 233, and the second pole ear 233 is the negative pole ear. During the charge and discharge process of the battery 10, the positive electrode active material and the negative electrode active material react with the electrolyte, and the first pole ear 232 and the second pole ear 233 connect the electrode terminals to form a current loop.

[0095] The two second pole tabs 233 located on the first side A1 can be directly electrically connected to each other, that is, the two second pole tabs 233 located on the first side A1 can be connected in contact with each other, for example, by ultrasonic welding and / or laser welding. Since the pole tabs themselves are conductive metals, electrical connection can be achieved after connection, that is, current can reach another second pole tab 233 from one second pole tab 233. Alternatively, the two second pole tabs 233 located on the first side A1 can be electrically connected to each other through a transition component. The shape and material of the transition component are not particularly limited. As long as the two second pole tabs 233 located on the first side A1 can be electrically conductive, the two second pole tabs 233 can be electrically connected to each other. Similarly, the two first pole tabs 232 located on the second side A2 can be directly connected in contact, or the two first pole tabs 232 located on the second side A2 can be electrically connected to each other through a transition component. As long as the two first pole tabs 232 located on the second side A2 can be electrically conductive, the two first pole tabs 232 can be electrically connected to each other.

[0096] In the technical solution of the embodiment of the present application, the battery cell 200 includes a shell 220 and an electrode assembly 230 located in the accommodating cavity 221 of the shell 220. The electrode assembly 230 includes a first electrode assembly 230a and a second electrode assembly 230b, and the first electrode assembly 230a and the second electrode assembly 230b both include a first pole ear 232 and a second pole ear 233. The two second pole ears 233 located on the first side A1 are connected to each other, and the two first pole ears 232 located on the second side A2 are connected to each other, so that the first electrode assembly 230a and the second electrode assembly 230b can be connected in parallel with each other. The interconnected first pole ears 232 and the interconnected second pole ears 233 are located on different sides of the electrode cell, which can simplify the structure of the battery cell 200, avoid the risk of short circuit between the components connecting the two first pole ears 232 and the components connecting the two second pole ears 233, and improve the safety performance of the battery cell 200.

[0097] The interconnected first pole ear 232 and the interconnected second pole ear 233 are located on different sides of the electrode monomer, so that the interconnected first pole ear 232 and the interconnected second pole ear 233 can dissipate heat from different sides of the battery monomer 200, which can reduce the concentration of heat in the battery monomer 200, thereby effectively improving the heat dissipation performance of the battery monomer 200 and improving the safety performance of the battery monomer 200.

[0098] In addition, the two first pole ears 232 located on the second side A2 can be connected to the first pole ear 232 located on the first side A1 of the first electrode assembly 230a, so that the first pole ear 232 and the second pole ear 233 with opposite polarities on the battery cell 200 can be led out on the first side A1 of the battery cell 200, which can simplify the wiring of the battery cell 200.

[0099] Optional, please continue to Figures 4 to 6 The battery cell 200 also includes an end cap assembly 210, which refers to a component that covers the opening of the shell 220 to isolate the internal environment of the battery cell 200 from the external environment. Without limitation, the shape of the end cap assembly 210 can be adapted to the shape of the shell 220 to match the shell 220. Optionally, the end cap assembly 210 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap assembly 210 is not easy to deform when it is squeezed and collided, so that the battery cell 200 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals can be provided on the end cap assembly 210. The electrode terminal can be used to electrically connect to the electrode assembly 230 for outputting or inputting electrical energy of the battery cell 200. In some embodiments, the end cap assembly 210 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 200 reaches a threshold. The end cover assembly 210 may also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0100] In some embodiments, an insulating member may be provided inside the end cap assembly 210 to isolate the electrical connection components in the housing 220 from the end cap assembly 210 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0101] The shell 220 and the end cap assembly 210 may be independent components, and an opening 223 may be provided on the shell 220, and the end cap assembly 210 is made to cover the opening 223 at the opening 223 to form the internal environment of the battery cell 200. Without limitation, the end cap assembly 210 and the shell 220 may be integrated, specifically, the end cap assembly 210 and the shell 220 may form a common connection surface before other components are put into the shell, and when the interior of the shell 220 needs to be encapsulated, the end cap assembly 210 is made to cover the shell 220. The shell 220 may be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc.

[0102] Please continue reading Figures 4 to 6 In some embodiments, the housing 220 further includes a wall portion 222, which encloses a housing cavity 221 and an opening 223 that is in communication with the housing cavity 221 and is located at least on the first side A1. The end cap assembly 210 is used to close the opening 223, and the end cap assembly 210 includes an end cap body 211 and a first electrode terminal 212 and a second electrode terminal 213 that are provided on the end cap body 211 and have opposite polarities, the first electrode terminal 212 is electrically connected to the first electrode tab 232 located on the first side A1, and the second electrode terminal 213 is electrically connected to at least one of the two second electrode tabs 233.

[0103] In some embodiments, the first electrode terminal 212 is directly ultrasonically welded and / or laser welded to the first electrode tab 232 located at the first side A1 to achieve electrical connection, that is, current can pass through the first electrode tab 232 to reach the first electrode terminal 212 .

[0104] In some embodiments, the first electrode terminal 212 is electrically connected to the first electrode tab 232 located at the first side A1 indirectly through a conductive transition component.

[0105] In some embodiments, the second electrode terminal 213 is ultrasonically welded and / or laser welded to one of the two second electrode tabs 233 to achieve electrical connection.

[0106] In some embodiments, the second electrode terminal 213 is electrically connected to the two second electrode tabs 233 indirectly through a conductive transition component.

[0107] According to the embodiment of the present application, by arranging the first electrode terminal 212 and the second electrode terminal 213 on the end cap assembly 210, the first electrode terminal 212 is connected to the first pole tab 232 to lead out the first pole tab 232, and the second electrode terminal 213 is connected to the second pole tab 233 to lead out the second pole tab 233. The opening 223 is located on the first side A1, that is, the end cap assembly 210 covering the opening 223 is located on the first side A1, which can reduce the distance between the first pole tab 232 and the first electrode terminal 212, and the distance between the second pole tab 233 and the second electrode terminal 213 on the first side A1.

[0108] Optionally, the battery cell 200 further has a width direction X and a thickness direction Y, and the width direction X, the height direction Z and the thickness direction Y are perpendicular to each other. The plane where the end cap assembly 210 is located is parallel to the plane formed by the thickness direction Y and the width direction X.

[0109] In some embodiments, please refer to Figures 4 to 7 The wall portion 222 includes a bottom portion 222 a disposed opposite to the opening 223 , and at least a portion of at least one first electrode tab 232 located on the second side A2 is directly or indirectly in contact with the bottom portion 222 a .

[0110] According to an embodiment of the present application, by making the first pole tab 232 directly or indirectly abut against the bottom 222a, the first pole tab 232 can be reused as a heat dissipation pole tab, which can transfer the heat on the first pole tab 232 to the bottom 222a, thereby improving the heat dissipation capacity of the battery cell 200.

[0111] Optionally, among the two first pole ears 232 located on the second side A2, at least one first pole ear 232 may directly abut against the bottom 222a, or at least one first pole ear 232 may indirectly abut against the bottom 222a, as long as the heat of the first pole ear 232 can be transferred to the bottom 222a.

[0112] Optionally, the bottom 222 a may be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 200 reaches a threshold value.

[0113] Optional, please continue to Figure 5 , the plane where the bottom 222a is located is parallel to the plane formed by the thickness direction Y and the width direction X. Optionally, the wall portion 222 further includes a side portion 222b extending along the height direction Z, connected to the periphery of the bottom 222a, and enclosing the opening 223. The bottom 222a and the side portion 222b are integrally formed to improve the structural strength of the housing 220.

[0114] Figure 8 A first electrode assembly of a battery cell provided in an embodiment of the present application is Figure 7 Cross-sectional view at AA in the middle.

[0115] In some embodiments, Figures 6 to 8 As shown, at least one of the two first tabs 232 located at the second side A2 is bent to form a supporting portion 232a, and a surface of the supporting portion 232a facing the bottom 222a is a matching surface s1 that is in contact with the bottom 222a.

[0116] According to the embodiment of the present application, by forming a mating surface s1 on the abutting portion 232a of the first pole tab 232, the heat dissipation area of ​​the first pole tab 232 can be increased, thereby accelerating the heat transfer speed between the first pole tab 232 and the bottom 222a, and further improving the heat dissipation capacity of the battery cell 200.

[0117] Optionally, a support portion 270 may be further disposed in the bent first electrode tab 232 to improve deformation of the first electrode tab 232 .

[0118] Optionally, as described above, the mating surface s1 may directly abut against the bottom 222a, or the mating surface s1 may indirectly abut against the bottom 222a.

[0119] Optionally, the matching surface s1 is arranged parallel to the surface of the bottom 222 a facing the opening 223 , so as to further increase the contact area between the first electrode tab 232 and the bottom 222 a .

[0120] In some embodiments, Figure 6As shown, the battery cell 200 further includes a first transition component 240 , and the two first pole tabs 232 located at the second side A2 are connected to each other through the first transition component 240 .

[0121] According to the embodiment of the present application, by providing the first adapter component 240 , the two first pole tabs 232 on the second side A2 can be connected, and the heat of the two first pole tabs 232 can be transferred to the first adapter component 240 .

[0122] Optionally, the first adapter component 240 may be plate-shaped to increase the contact area between the first pole tab 232 and the first adapter component 240, and improve the stability of the connection between the first pole tab 232 and the first adapter component 240. Optionally, when the first pole tab 232 is bent, the first adapter component 240 may be disposed inside the first pole tab 232, or the first adapter component 240 may be disposed on the side of the first pole tab 232 facing the bottom 222a.

[0123] In some embodiments, the first transition component 240 is located between the two first tabs 232 and the bottom 222 a on the second side A2 , so that the mating surface s1 abuts against each other through the first transition component 240 and the bottom 222 a .

[0124] According to the embodiment of the present application, the mating surface s1 is abutted against the bottom 222a through the first adapter component 240, so that heat can be transferred from the first pole tab 232 to the bottom 222a through the first adapter component 240. In addition, the first adapter component 240 connects the two first pole tabs 232, so that both the two first pole tabs 232 can transfer heat to the bottom 222a through the first adapter component 240, which can further improve the heat dissipation capacity of the battery cell 200.

[0125] Optionally, the first transition component 240 and the bottom 222a may directly abut against each other or indirectly abut against each other.

[0126] Optionally, the orthographic projections of the two first tabs 232 on the second side A2 along the height direction Z are located within the orthographic projection of the first adapter component 240 along the height direction Z, so as to increase the contact area between the first adapter component 240 and the two first tabs 232 .

[0127] Optionally, the size of the first adapter component 240 is compatible with the size of the bottom 222a. On the one hand, the first adapter component 240 is relatively large, which can increase the contact area between the first adapter component 240 and the two first pole tabs 232 located on the second side A2, improve the stability of the relative position of the first adapter component 240 and the first pole tabs 232, and increase the flow rate of the first adapter component 240. On the other hand, the contact area between the first adapter component 240 and the bottom 222a can be increased to accelerate the heat dissipation of the first pole tabs 232.

[0128] In some embodiments, Figure 5 and Figure 6 As shown, an insulating heat conductive plate 250 is provided on the side of the bottom 222a facing the accommodating cavity 221, and at least part of the insulating heat conductive plate 250 is located between the first adapter component 240 and the bottom 222a to achieve heat conduction between the first adapter component 240 and the bottom 222a.

[0129] According to the embodiment of the present application, by providing the insulating heat conductive plate 250 , the heat transfer speed between the first adapter component 240 and the bottom 222 a can be accelerated, thereby improving the heat dissipation capacity of the battery cell 200 .

[0130] Optionally, the size of the insulating heat conductive plate 250 is matched with the size of the bottom 222a to improve the heat dissipation capability.

[0131] Optionally, the thermal conductivity of the insulating heat-conducting plate 250 is greater than the thermal conductivity of the diaphragm, so that the insulating heat-conducting plate 250 can conduct heat more quickly.

[0132] In some embodiments, the insulating heat-conducting plate 250 and the first adapter component 240 are bonded to each other by insulating heat-conducting adhesive. The insulating heat-conducting adhesive can ensure the stability of the relative position between the insulating heat-conducting plate 250 and the first adapter component 240.

[0133] In some embodiments, the insulating heat-conducting plate 250 and the bottom 222a are bonded to each other by insulating heat-conducting adhesive. The insulating heat-conducting adhesive can ensure the stability of the relative position between the insulating heat-conducting plate 250 and the bottom 222a.

[0134] In some embodiments, Figure 6 and Figure 7 As shown, the main body 231 of the first electrode assembly 230a and the main body 231 of the second electrode assembly 230b both include two first surfaces 231a arranged opposite to each other and a second surface 231b connecting the two first surfaces 231a and arranged opposite to each other, the area of ​​the first surface 231a is greater than the area of ​​the second surface 231b, and the first electrode assembly 230a and the second electrode assembly 230b are arranged side by side opposite to each other through the second surface 231b. That is, the orthographic projection size of the first electrode assembly 230a and the second electrode assembly 230b along the width direction is smaller than the orthographic projection size of each of them along the thickness direction, and the first electrode assembly 230a and the second electrode assembly 230b are arranged side by side along the width direction.

[0135] According to the embodiment of the present application, the first electrode assembly 230a and the second electrode assembly 230b are arranged side by side through the second surface 231b with a smaller area, so that the first surface 231a can be not blocked by other electrode assemblies 230, and the heat of the electrode assembly 230 can be dissipated through the first surface 231a. In addition, the area of ​​the first surface 231a is large, which can improve the heat dissipation capacity of the electrode assembly 230.

[0136] Optionally, the two first surfaces 231a may be arranged opposite to each other along the thickness direction Y, and the two second surfaces 231b may be arranged opposite to each other along the width direction X, and the plane where the first surface 231a is located is parallel to the plane defined by the height direction Z and the width direction X. The second surface 231b may be a curved surface or a plane, and when the second surface 231b is a plane, the plane where the second surface 231b is located is parallel to the plane defined by the height direction Z and the thickness direction Y.

[0137] In some embodiments, Figure 6 and Figure 7 As shown, among the first electrode tab 232 and the second electrode tab 233 located on the first side A1 of the first electrode assembly 230a, the second electrode tab 233 is located on the side of the first electrode tab 232 facing the second electrode assembly 230b.

[0138] According to an embodiment of the present application, the second electrode tab 233 on the first electrode assembly 230 a is disposed close to the second electrode assembly 230 b , so that the distance between the two second electrode tabs 233 on the first side A1 is short, which facilitates the connection of the two second electrode tabs 233 .

[0139] Optional, such as Figure 6 As shown, the battery cell 200 further includes a second adapter component 260, which is used to connect the two second pole tabs 233 located on the first side A1. Optionally, the extension dimension of the second adapter component 260 in the thickness direction Y is the same as the extension dimension of the main body 231 of the first electrode assembly 230a in the thickness direction Y. The second adapter component 260 is made larger in size, which can increase the contact area between the second pole tab 233 and the second adapter component 260.

[0140] Optionally, the orthographic projections of the two second pole tabs 233 located on the first side A1 along the height direction Z are located within the orthographic projection of the second transition component 260 along the height direction Z, so as to increase the contact area between the second transition component 260 and the two second pole tabs 233 .

[0141] In some embodiments, Figures 6 to 8As shown, the first electrode assembly 230a and the second electrode assembly 230b are electrode assemblies 230 formed by winding, and include a straight area Q and a bending area W. Among the two first pole ears 232 located on the second side A2, the first pole ear 232 of the first electrode assembly 230a is located in the straight area Q of the first electrode assembly 230a, and / or the first pole ear 232 of the second electrode assembly 230b is located in the straight area Q of the second electrode assembly 230b.

[0142] According to an embodiment of the present application, when the first pole tab 232 of the second side A2 is located in the straight region Q of the first electrode assembly 230a and / or the second electrode assembly 230b, the shape of the first pole tab 232 can be ensured to be regular. In addition, when the first pole tab 232 is bent to form the abutment portion 232a, the bending difficulty of the first pole tab 232 can be reduced.

[0143] Optionally, when the electrode assembly 230 is a wound electrode, the electrode assembly 230 is formed by winding the positive electrode sheet, the negative electrode sheet and the separator 236. The straight area Q of the electrode assembly 230 is the area where the positive electrode sheet, the negative electrode sheet and the separator 236 are straight, and the bent area W of the electrode assembly 230 is the area where the positive electrode sheet, the negative electrode sheet and the separator 236 are bent due to winding.

[0144] In some embodiments, Figures 6 to 8 As shown, among the two first pole ears 232 located on the second side A2, the width L1 of the first pole ear 232 of the first electrode assembly 230a and the width L2 of the straight area Q of the first electrode assembly 230a satisfy 5mm≤L2-L1≤10mm; and / or the width L3 of the first pole ear 232 of the second electrode assembly 230b and the width L4 of the straight area Q of the second electrode assembly 230b satisfy 5mm≤L4-L3≤10mm.

[0145] During the preparation of the wound electrode assembly 230, a portion of the electrode sheet that is not coated with active material is extended as a tab sheet. A plurality of tab sheets are extended from one side of the electrode sheet and are spaced apart along the length direction of the electrode sheet. During the winding process of the electrode sheet, a plurality of tab sheets are stacked to form a complete first tab 232 or a second tab 233. During the winding process of the electrode sheet, there may be process errors, resulting in misalignment of the stacked plurality of tab sheets.

[0146] According to the embodiment of the present application, when the width L1 of the first pole tab 232 and the width L2 of the straight region Q of the first electrode assembly 230a satisfy 5mm≤L2-L1≤10mm, even if the first pole tab 232 is offset due to a process error, it is still possible to ensure that the first pole tab 232 is located in the straight region Q of the first electrode assembly 230a. Similarly, when the width L3 of the second pole tab 233 and the width L4 of the straight region Q of the second electrode assembly 230b satisfy 5mm≤L4-L3≤10mm, even if the second pole tab 233 is offset due to a process error, it is still possible to ensure that the second pole tab 233 is located in the straight region Q of the second electrode assembly 230b.

[0147] In some embodiments, the first electrode assembly 230a and the second electrode assembly 230b are both laminated electrode assemblies 230, and among the two first electrode ears 232 located on the second side A2, the width L5 of the first electrode ear 232 of the first electrode assembly 230a and the width L6 of the first electrode assembly 230a satisfy 0≤L6-L5≤10mm; and / or, the width L7 of the first electrode ear 232 of the second electrode assembly 230b and the width L8 of the second electrode assembly 230b satisfy 0≤L8-L6≤10mm.

[0148] During the preparation of the laminated electrode assembly 230, the portion of each electrode sheet that is not coated with active material is used as a tab sheet. When multiple electrode sheets are stacked, multiple tab sheets are stacked to form a first tab 232 or a second tab 233 of the electrode assembly 230. When multiple electrode sheets are stacked, the tab sheets may be misaligned.

[0149] According to an embodiment of the present application, when L5 and L6 satisfy the above range, even if a plurality of tab segments are misaligned due to process errors, it can be ensured that the first tab 232 will not extend out of the overlapping area of ​​the plurality of tab segments.

[0150] In some embodiments, there are multiple second electrode assemblies 230b, and the second electrode ear 233 of each second electrode assembly 230b is located on the first side A1 and electrically connected to the second electrode ear 233 of the first electrode assembly 230a, and the first electrode ear 232 of each second electrode assembly 230b is located on the second side A2 and electrically connected to the first electrode ear 232 on the first side A1 of the first electrode assembly 230a.

[0151] According to the embodiment of the present application, by providing a plurality of second electrode assemblies 230b, the capacity of the battery cell 200 can be increased. The second electrode tabs 233 of each second electrode assembly 230b are connected to the second electrode tabs 233 of the first electrode assembly 230a, and the plurality of first electrode tabs 232 of the first side A1 are connected to each other, so that the plurality of second electrode assemblies 230b can be connected in parallel with the first electrode assembly 230a.

[0152] Optionally, the first electrode assembly 230a and the plurality of second electrode assemblies 230b are arranged side by side along the width direction X, that is, the first surfaces 231a of the first electrode assembly 230a and the plurality of second electrode assemblies 230b are not blocked by other electrode assemblies 230, thereby improving the heat dissipation capacity of the electrode assembly 230.

[0153] In some embodiments, among the two first pole ears 232 located on the second side A2, the orthographic projection of the first pole ear 232 of the first electrode assembly 230a along the height direction Z is located within the orthographic projection of the main body 231 of the first electrode assembly 230a along the height direction Z, and the orthographic projection of the first pole ear 232 of the second electrode assembly 230b along the height direction Z is located within the orthographic projection of the main body 231 of the second electrode assembly 230b along the height direction Z.

[0154] In an embodiment of the present application, the first pole ear 232 of the first electrode assembly 230a located on the second side A2 will not protrude from the body of the first electrode assembly 230a, and the first pole ear 232 of the second electrode assembly 230b will not protrude from the body of the second electrode assembly 230b, thereby preventing the first pole ear 232 from scratching the inner wall surface of the shell 220 facing the accommodating cavity 221.

[0155] In some embodiments, Figures 6 to 8 As shown, the first electrode assembly 230a and the second electrode assembly 230b both include a first electrode piece 234, a second electrode piece 235, and a diaphragm 236 located between the first electrode piece 234 and the second electrode piece 235. In the first electrode assembly 230a and / or the second electrode assembly 230b, the first electrode ear 232 extends from the first electrode piece 234 and exceeds the diaphragm 236, and the second electrode ear 233 extends from the second electrode piece 235 and exceeds the diaphragm 236.

[0156] According to an embodiment of the present application, the first pole tab 232 extends out of the diaphragm 236. When the first pole tab 232 includes multiple pole tab segments, the stability of the electrical connection between the multiple pole tab segments can be ensured. Similarly, the second pole tab 233 extends out of the diaphragm 236. When the second pole tab 233 includes multiple pole tab segments, the stability of the electrical connection between the multiple pole tab segments can be ensured.

[0157] Optionally, the first pole piece 234 is, for example, a positive pole piece, and the first pole tab 232 is a positive pole tab. The second pole piece 235 is, for example, a negative pole piece, and the second pole tab 233 is a negative pole tab.

[0158] According to some embodiments of the present application, the present application further provides a battery 10, comprising the battery cell 200 described in any of the above schemes.

[0159] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 10 described in any of the above schemes, and the battery 10 is used to provide electrical energy to the electrical device.

[0160] The electrical device may be any of the aforementioned devices or systems using the battery 10 .

[0161] See also Fig. 9 , Fig. 9 It is a schematic flow chart of a method for manufacturing a battery cell according to an embodiment of the present application.

[0162] According to some embodiments of the present application, the present application also provides a method for manufacturing a battery cell, wherein the battery cell can be Figures 4 to 8 Please refer to the battery cell shown in Figures 4 to 9 The manufacturing method of the battery cell provided in the embodiment of the present application includes:

[0163] Step S01: preparing a first electrode assembly 230a, wherein a main body 231 of the first electrode assembly 230a has a first electrode tab 232 and a second electrode tab 233 extending from a first side A1, and a first electrode tab 232 extending from a second side A2.

[0164] Step S02: preparing a second electrode assembly 230b, wherein the main body 231 of the second electrode assembly 230b has a second electrode tab 233 extending from the first side A1 and a first electrode tab 232 extending from the second side A2.

[0165] Step S03: in the first electrode assembly 230a and the second electrode assembly 230b, the two first electrode tabs 232 located at the second side A2 are electrically connected to each other, and the two second electrode tabs 233 located at the first side A1 are electrically connected to each other.

[0166] Step S04 : placing the first electrode assembly 230 a and the second electrode assembly 230 b in the accommodating cavity 221 of the housing 220 .

[0167] In the preparation method provided in the embodiment of the present application, the first electrode assembly 230a is first prepared, and the first pole tab 232 and the second pole tab 233 with different polarities are led out on the first side A1, and the first pole tab 232 is led out on the second side A2, and the first pole tab 232 on the second side A2 is connected to the first pole tab 232 on the first side A1. Then, the second electrode assembly 230b is prepared, and the second electrode assembly 230b has the second pole tab 233 led out on the first side A1 and the first pole tab 232 led out on the second side A2. Then, through step S03, the two first pole tabs 232 on the second side A2 and the two second pole tabs 233 on the first side A1 are connected, so that the first electrode assembly 230a and the second electrode assembly 230b can be connected in parallel with each other. In step S03, different pole tabs are connected on different sides. This can simplify the connection of the pole tabs on the one hand, and on the other hand, it can also simplify the structure of the battery cell 200, avoiding the risk of short circuit between the components connecting the two first pole tabs 232 and the components connecting the two second pole tabs 233, thereby improving the safety performance of the battery cell 200.

[0168] In addition, the two first pole ears 232 located on the second side A2 can be connected to the first pole ear 232 located on the first side A1 of the first electrode assembly 230a, so that the first pole ear 232 and the second pole ear 233 with opposite polarities on the battery cell 200 can be led out on the first side A1 of the battery cell 200, which can simplify the wiring of the battery cell 200.

[0169] 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: include: A housing having a receiving cavity; At least two electrode assemblies are located in the accommodating cavity, and each of the at least two electrode assemblies includes a main body and a first electrode tab and a second electrode tab with opposite polarities extending from the main body. Among them, the battery cell includes a first side and a second side arranged opposite to each other in the height direction thereof, and the at least two electrode assemblies include a first electrode assembly and a second electrode assembly, the main body of the first electrode assembly has the first pole lug and the second pole lug led out on the first side, and the first pole lug led out on the second side, the main body of the second electrode assembly has the second pole lug led out on the first side, and the first pole lug led out on the second side, and in the first electrode assembly and the second electrode assembly, the two second pole lugs located on the first side are electrically connected to each other, and the two first pole lugs located on the second side are electrically connected to each other.

2. The battery cell according to claim 1, characterized in that: The housing further comprises a wall portion, the wall portion enclosing the accommodating cavity and an opening communicating with the accommodating cavity and located at least on the first side; The battery cell also includes an end cap assembly for closing the opening, the end cap assembly including an end cap body and a first electrode terminal and a second electrode terminal with opposite polarities provided on the end cap body, the first electrode terminal being used to be electrically connected to the first electrode tab located on the first side, and the second electrode terminal being electrically connected to at least one of the two second electrode tabs.

3. The battery cell according to claim 2, characterized in that: The wall portion includes a bottom portion disposed opposite to the opening, and at least a portion of at least one of the first pole tabs located on the second side is in direct or indirect contact with the bottom portion.

4. The battery cell according to claim 3, characterized in that: At least one of the two first electrode tabs located on the second side is bent to form a supporting portion, and a surface of the supporting portion facing the bottom is a matching surface that abuts against the bottom.

5. The battery cell according to claim 4, characterized in that: It also includes a first transition component, through which the two first electrode tabs located on the second side are connected to each other.

6. The battery cell according to claim 5, characterized in that: The first transition component is located between the two first tabs and the bottom on the second side, so that the matching surfaces abut against each other through the first transition component and the bottom.

7. The battery cell according to claim 6, characterized in that: An insulating heat-conducting plate is arranged on a side of the bottom facing the accommodating cavity, and at least a portion of the insulating heat-conducting plate is located between the first adapter component and the bottom to achieve heat conduction between the first adapter component and the bottom.

8. The battery cell according to claim 7, characterized in that: The insulating heat-conducting plate and the first adapter component are bonded to each other via an insulating heat-conducting adhesive; and / or the insulating heat-conducting plate and the bottom are bonded to each other via an insulating heat-conducting adhesive.

9. The battery cell according to any one of claims 1, characterized in that: The main body of the first electrode assembly and the main body of the second electrode assembly each include two first surfaces arranged opposite to each other and a second surface connecting the two first surfaces and arranged opposite to each other, the area of ​​the first surface is greater than the area of ​​the second surface, and the first electrode assembly and the second electrode assembly are arranged opposite to each other side by side through the second surface.

10. The battery cell according to claim 9, characterized in that: Among the first electrode tab and the second electrode tab located on the first side of the first electrode assembly, the second electrode tab is located on a side of the first electrode tab facing the second electrode assembly.

11. The battery cell according to any one of claims 1, characterized in that: The first electrode assembly and the second electrode assembly are electrode assemblies formed by winding, and include a straight area and a bent area. Among the two first electrode ears located on the second side, the first electrode ear of the first electrode assembly is located in the straight area of ​​the first electrode assembly, and / or the first electrode ear of the second electrode assembly is located in the straight area of ​​the second electrode assembly.

12. The battery cell according to claim 11, characterized in that: Among the two first pole ears located on the second side, the width L1 of the first pole ear of the first electrode assembly and the width L2 of the straight area of ​​the first electrode assembly satisfy 5mm≤L2-L1≤10mm; and / or the width L3 of the first pole ear of the second electrode assembly and the width L4 of the straight area of ​​the second electrode assembly satisfy 5mm≤L4-L3≤10mm.

13. The battery cell according to any one of claims 11, characterized in that: The first electrode assembly and the second electrode assembly are both laminated electrode assemblies, and among the two first pole ears located on the second side, the width L5 of the first pole ear of the first electrode assembly and the width L6 of the first electrode assembly satisfy 0≤L6-L5≤10mm; and / or, the width L7 of the first pole ear of the second electrode assembly and the width L8 of the second electrode assembly satisfy 0≤L8-L6≤10mm.

14. The battery cell according to any one of claims 1, characterized in that: There are multiple second electrode assemblies, and the second pole ear of each second electrode assembly is located on the first side and electrically connected to the second pole ear of the first electrode assembly. The first pole ear of each second electrode assembly is located on the second side and electrically connected to the first pole ear on the first side of the first electrode assembly.

15. The battery cell according to any one of claims 1, characterized in that: Of the two first pole ears located on the second side, the orthographic projection of the first pole ear of the first electrode assembly along the height direction is located within the orthographic projection of the main body of the first electrode assembly along the height direction, and the orthographic projection of the first pole ear of the second electrode assembly along the height direction is located within the orthographic projection of the main body of the second electrode assembly along the height direction.

16. The battery cell according to any one of claims 1, characterized in that: The first electrode assembly and the second electrode assembly both include a first electrode plate, a second electrode plate, and a diaphragm located between the first electrode plate and the second electrode plate. In the first electrode assembly and / or the second electrode assembly, along the height direction, the first electrode ear extends from the first electrode plate and exceeds the diaphragm, and the second electrode ear extends from the second electrode plate and exceeds the diaphragm.

17. A battery, characterized in that: include: A battery cell as claimed in any one of claims 1 to 16.

18. An electrical equipment, characterized in that: The electric device comprises the battery as claimed in claim 17, and the battery is used to provide electric energy.

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