Collector plate assembly, battery cell, battery and electric device

Abstract

The utility model discloses a collector plate assembly, a battery monomer, a battery and an electric device. The flow collecting plate assembly comprises a first flow collecting piece, a second flow collecting piece and a connecting piece. The first current collecting piece is used for being connected with the electrode assembly of the single battery, the first current collecting piece is provided with a first surface, and the first surface is concave inwards to form a first mounting groove. The second current collecting piece and the first current collecting piece are arranged in a stacked mode, the second current collecting piece is used for being connected with an end cover of the battery single body, the second current collecting piece faces the first surface, and a concave second mounting groove is formed in the surface, facing the first mounting groove, of the second current collecting piece. The connecting piece is arranged in the first mounting groove and the second mounting groove so as to connect the first flow collecting piece and the second flow collecting piece. According to the structure, the current collecting plate assembly can be welded and assembled outside the shell of the battery monomer, so that the risk that the first current collecting piece and the second current collecting piece are welded inside the shell to generate cracks is reduced, meanwhile, the connection strength of the electrode assembly and the end cover in the battery monomer is improved, and the operation stability of the battery monomer is improved.

Description

Technical Field

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

[0002] Battery cells are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, and energy storage systems, etc. Battery cells can include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, sodium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.

[0003] At present, with the development of new energy technologies, how to improve the production efficiency of battery cells is also one of the research issues in this field. Utility Model Content

[0004] In view of the above problems, the present application provides a current collecting plate assembly, a battery cell, a battery and an electrical device, which can improve the structural stability of the welding of the current collecting plate assembly and improve the production efficiency of the battery cell.

[0005] In the first aspect, the present application provides a current collecting plate assembly, comprising a first current collecting member, a second current collecting member and a connecting member. The first current collecting member is used to connect the electrode assembly of the battery cell, and the first current collecting member has a first surface, and the first surface is concave to form a first mounting groove. The second current collecting member is stacked with the first current collecting member, and the second current collecting member is used to connect the end cover of the battery cell, and the second current collecting member is arranged toward the first surface, and the surface of the second current collecting member facing the first mounting groove is provided with a concave second mounting groove. The connecting member is arranged in the first mounting groove and the second mounting groove to connect the first current collecting member and the second current collecting member.

[0006] In the technical solution of the embodiment of the present application, a first current collector is provided for connecting with the electrode assembly, and a second current collector is provided for connecting with the end cover. In addition, a first mounting groove and a second mounting groove are provided in the first current collector and the second current collector, respectively, and a connector is provided in the first mounting groove and the second mounting groove to connect the first current collector and the second current collector. With the above structure, the current collecting plate assembly can be welded and assembled outside the shell of the battery cell, reducing the risk of cracks generated by welding the first current collector and the second current collector inside the shell, while improving the strength of the connection between the electrode assembly and the end cover in the battery cell, and improving the stability of the operation of the battery cell.

[0007] In some embodiments, the first mounting groove is arranged along the circumference of the first current collecting member and forms a closed annular groove. In the above structure, setting the first mounting groove as a closed annular groove can increase the space for setting the connecting member, improve the strength of the connection between the connecting member and the first current collecting member and the second current collecting member, and can evenly distribute the connection force to the first current collecting member, thereby improving the stability of the connection between the first current collecting member and the second current collecting member.

[0008] In some embodiments, the second mounting groove penetrates the second current collecting member along the thickness direction. In the above structure, the second mounting groove penetrates the second current collecting member, and the connecting member can penetrate the second current collecting member along the thickness direction, thereby improving the strength of the connection between the connecting member and the second current collecting member, thereby improving the strength of the connection between the first current collecting member and the second current collecting member.

[0009] In some embodiments, the connector includes a first part and a second part, the first part is filled in the first mounting groove. The second part is filled in the second mounting groove, and the second part and the first part are integrally formed. In the above structure, the connector is set as an integrally formed structure, which improves the strength of the connection between the first current collecting part and the second current collecting part and the efficiency of the current collecting disc assembly.

[0010] In some embodiments, the connector further includes a third portion, which extends along a side of the second portion away from the first portion and protrudes from a surface of the second current collector away from the first current collector. In the above structure, the third portion is protrudingly arranged to extend the thickness of the connector, increase the connection strength between the connector and the second current collector, and thus improve the connection strength and stability between the first current collector and the second current collector.

[0011] In some embodiments, the second current collector is used to be arranged toward the pressure relief mechanism, and the surface of one side of the second current collector facing the pressure relief mechanism is concave to form an avoidance groove, and the positive projection of the pressure relief mechanism on the second current collector completely falls into the avoidance groove. In the above technical solution, by setting the avoidance groove, the risk of interference between the second current collector and the pressure relief mechanism is reduced, the efficiency of opening the pressure relief mechanism is improved, the probability of failure of the pressure relief mechanism inside the battery cell is reduced, and the stability of the operation of the battery cell is improved.

[0012] In some embodiments, the second current collector includes a connecting portion and a supporting portion. The connecting portion is arranged along the circumference of the first current collector, and the second mounting groove is arranged on the connecting portion. The supporting portion extends toward the center of the first current collector along the edge of the connecting portion. In the above technical solution, the connection strength between the first current collector plate and the second current collector is improved by setting the connecting portion, and the structural strength of the avoidance groove is improved by setting the supporting portion, which reduces the probability of deformation of the first current collector during welding, and improves the connection strength between the first current collector and the second current collector.

[0013] In a second aspect, the present application provides a battery cell, which includes the current collecting plate assembly in the above embodiment.

[0014] In a third aspect, the present application provides a battery, which includes the battery cell in the above embodiment.

[0015] In a fourth aspect, the present application provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0016] 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

[0017] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0018] Figure 1 A schematic diagram of the structure of a vehicle according to an embodiment of the present application;

[0019] Figure 2 This is a schematic diagram of the exploded structure of a battery according to an embodiment of the present application;

[0020] Figure 3 This is a schematic diagram of the exploded structure of a battery cell according to an embodiment of the present application;

[0021] Figure 4 A schematic diagram of the cross-sectional structure of a battery cell according to an embodiment of the present application;

[0022] Figure 5 for Figure 4 A schematic diagram of the enlarged structure of the middle circle A;

[0023] Figure 6 A partial cross-sectional structural schematic diagram of a current collecting plate assembly according to an embodiment of the present application;

[0024] Figure 7 A schematic cross-sectional structure diagram of a connector of a current collecting plate assembly according to an embodiment of the present application;

[0025] Figure 8 This is a schematic structural diagram of a second current collecting member according to an embodiment of the present application.

[0026] DETAILED DESCRIPTION OF REFERENCE NUMERALS

[0027] 1. Vehicle; 2. Battery; 10. Electrode assembly; 20. Shell; 25. Electrode terminal; 30. End cover; 40. Outer shell; 3. Controller; 4. Motor; 5. Box; 51. Upper box; 52. Lower box; 53. Accommodation space; 6. Collecting plate assembly; 601. First collector; 602. Second collector; 603. Connector; 604. First surface; 605. First mounting groove; 606. Second mounting groove; 607. First part; 608. Second part; 609. Third part; 610. Avoidance groove; 611. Connecting part; 612. Supporting part; 7. Battery cell. DETAILED DESCRIPTION

[0028] 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.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0030] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship 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.

[0031] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0033] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0034] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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.

[0035] 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 those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0036] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. 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 2 is provided inside the vehicle 1, and the battery 2 may be provided at the bottom, the head or the tail of the vehicle 1. The battery 2 may be used to power the vehicle 1, for example, the battery 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 3 and a motor 4, and the controller 3 is used to control the battery 2 to power the motor 4, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0037] In some embodiments of the present application, the battery 2 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.

[0038] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0039] Please refer to Figure 2 , Figure 2The exploded diagram of the battery provided in some embodiments of the present application. The battery 2 includes a box body 5 and a battery cell 7, and the battery cell 7 is accommodated in the box body 5. The box body 5 is used to provide a storage space for the battery cell 7, and the box body 5 can adopt a variety of structures.

[0040] In some optional embodiments, the box body 5 includes an upper box body 51 and a lower box body 52, the upper box body 51 and the lower box body 52 cover each other, and the upper box body 51 and the lower box body 52 jointly define a storage space 53 for accommodating the battery cell 7. The lower box body 52 can be a hollow structure with one end open, and the upper box body 51 can be a plate-like structure, and the upper box body 51 covers the open side of the lower box body 52, so that the upper box body 51 and the lower box body 52 jointly define the storage space 53; the upper box body 51 and the lower box body 52 can also be hollow structures with one side open, and the open side of the upper box body 51 covers the open side of the lower box body 52. ​​Of course, the box body 5 formed by the upper box body 51 and the lower box body 52 can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0041] In some embodiments, the box 5 can be used as part of the chassis structure of the vehicle 1. For example, part of the box 5 can become at least a part of the floor of the vehicle 1, or part of the box 5 can become at least a part of the cross beam and longitudinal beam of the vehicle 1.

[0042] In the battery 2, there can be multiple battery cells 7, and the multiple battery cells 7 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 7 are both connected in series and in parallel. The multiple battery cells 7 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 7 is accommodated in the box 5. Of course, the battery 2 can also be a battery module formed by connecting multiple battery cells 7 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 5. The battery 2 can also include other structures, for example, the battery 2 can also include a converging component for realizing the electrical connection between the multiple battery cells 7.

[0043] Each battery cell 7 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 7 may be cylindrical, flat, rectangular or in other shapes.

[0044] Please refer to Figure 3 , Figure 3 The schematic diagram of the structure of the battery cell 7 provided in some embodiments of the present application. The battery cell 7 refers to the smallest unit constituting the battery 2. Figure 3 The battery cell 7 includes a housing 40, an electrode assembly 10 and other functional components.

[0045] The outer shell 40 may include an end cap 30 and a shell 20. The end cap 30 refers to a component that covers the opening of the shell 20 to isolate the internal environment of the battery cell 7 from the external environment. Without limitation, the shape of the end cap 30 may be adapted to the shape of the shell 20 to match the shell 20. Optionally, the end cap 30 may be made of a material with a certain hardness and strength (such as an aluminum alloy), so that the end cap 30 is not easily deformed when squeezed or collided, so that the battery cell 7 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 25 may be provided on the end cap 30. The electrode terminal 25 can be used to be electrically connected to the electrode assembly 10 for outputting or inputting electrical energy of the battery cell 7.

[0046] In some embodiments, the end cap 30 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 7 reaches a threshold value. The material of the end cap 30 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating component may also be provided on the inner side of the end cap 30, and the insulating component may be used to isolate the electrical connection components in the housing 20 from the end cap 30 to reduce the risk of short circuit. Exemplarily, the insulating component may be plastic, rubber, etc.

[0047] The shell 20 is a component used to cooperate with the end cap 30 to form the internal environment of the battery cell 7. Among them, the formed internal environment can be used to accommodate the electrode assembly 10, the electrolyte and other components. The shell 20 and the end cap 30 can be independent components, and an opening can be set on the shell 20, and the internal environment of the battery cell 7 is formed by covering the opening with the end cap 30 at the opening. Without limitation, the end cap 30 and the shell 20 can also be integrated. Specifically, the end cap 30 and the shell 20 can form a common connection surface before other components are put into the shell, and when the interior of the shell 20 needs to be encapsulated, the end cap 30 is covered with the shell 20. The shell 20 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 20 can be determined according to the specific shape and size of the electrode assembly 10. The material of the shell 20 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.

[0048] The electrode assembly 10 is a component in the battery cell 7 where electrochemical reactions occur. One or more electrode assemblies 10 may be included in the housing 20. The electrode assembly 10 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 7, active ions (such as lithium ions) are embedded and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow active ions to pass through.

[0049] In some embodiments, the separator is a separator. The present application has no particular restrictions on the type of separator, and any known porous separator with good chemical stability and mechanical stability can be selected. As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

[0050] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0051] In some embodiments, the battery cell 7 further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0052] In some embodiments, the electrode assembly 10 is a wound structure. Optionally, the electrode assembly 10 is a laminated structure.

[0053] In some embodiments, the shape of the electrode assembly 10 can be cylindrical, flat, or polygonal.

[0054] In some embodiments, the electrode assembly 10 is provided with tabs, which can conduct current from the electrode assembly 10. The tabs include a positive tab and a negative tab.

[0055] In some embodiments, the battery cell 7 includes a current collecting assembly, which is used to connect the electrode assembly 10 and the housing 20. Exemplarily, one side of the current collecting assembly is connected to the tab of the electrode assembly 10, and the other side of the current collecting assembly is connected to the end cap.

[0056] During the assembly process of the battery cell, after the electrode assembly is installed in the shell, the first current collecting disc is subsequently installed in the shell, and the first current collecting disc and the electrode assembly are welded and connected in the shell. After welding is completed, the second current collecting disc is installed, and the second current collecting disc is welded to the first current collecting disc. The second current collecting disc is then welded to the end cover to complete the assembly of the current collecting assembly. However, in the above process, the first current collecting disc and the second current collecting disc are made of different materials, and the welding space in the shell is small and inconvenient to operate, resulting in low welding efficiency, easy generation of welding cracks, and failure of airtightness.

[0057] In order to solve the above-mentioned problems, an embodiment of the present application provides a current collecting plate assembly, in which a first current collecting member is provided in the current collecting plate assembly for connecting to the electrode assembly, and a second current collecting member is provided for connecting to the end cover. In addition, a first mounting groove and a second mounting groove are provided in the first current collecting member and the second current collecting member, respectively, and a connecting member is provided in the first mounting groove and the second mounting groove to connect the first current collecting member and the second current collecting member. With the above-mentioned structure, the current collecting plate assembly can be welded and assembled outside the shell of the battery cell, reducing the risk of cracks caused by welding the first current collecting member and the second current collecting member inside the shell, while improving the strength of the connection between the electrode assembly and the end cover in the battery cell, and improving the stability of the operation of the battery cell.

[0058] The following is a detailed description of the collector plate assembly provided in the embodiment of the present application in conjunction with the accompanying drawings. Figures 3 to 7 , Figure 3 This is a schematic diagram of the exploded structure of a battery cell according to an embodiment of the present application. Figure 4 It is a schematic diagram of the cross-sectional structure of a battery cell according to an embodiment of the present application. Figure 5 for Figure 4 Schematic diagram of the enlarged structure of the middle circle A. Figure 6 It is a schematic diagram of a partial cross-section structure of a current collecting plate assembly according to one embodiment of the present application. Figure 7 It is a schematic cross-sectional structure diagram of a connector of a current collecting plate assembly according to an embodiment of the present application.

[0059] As shown in the figure, an embodiment of the present application provides a current collecting plate assembly 6, including a first current collecting member 601, a second current collecting member 602 and a connecting member 603. The first current collecting member 601 is used to connect the electrode assembly 10 of the battery cell 7, and the first current collecting member 601 has a first surface 604, and the first surface 604 is concave to form a first mounting groove 605. The second current collecting member 602 is stacked with the first current collecting member 601, and the second current collecting member 602 is used to connect the end cover 30 of the battery cell 7. The second current collecting member 602 is arranged toward the first surface 604, and the surface of the second current collecting member 602 facing the first mounting groove 605 is provided with a concave second mounting groove 606. The connecting member 603 is arranged in the first mounting groove 605 and the second mounting groove 606 to connect the first current collecting member 601 and the second current collecting member 602.

[0060] In the technical solution of the embodiment of the present application, a first current collector 601 is provided for connecting with the electrode assembly 10, and a second current collector 602 is provided for connecting with the end cover 30. In addition, a first mounting groove 605 and a second mounting groove 606 are provided in the first current collector 601 and the second current collector 602, respectively, and a connector 603 is provided in the first mounting groove 605 and the second mounting groove 606 to connect the first current collector 601 and the second current collector 602. With the above structure, the current collecting plate assembly 6 can be welded and assembled outside the shell 20 of the battery cell 7, reducing the risk of cracks generated by welding the first current collector 601 and the second current collector 602 inside the shell 20, while improving the strength of the connection between the electrode assembly 10 and the end cover 30 in the battery cell 7, and improving the stability of the operation of the battery cell 7.

[0061] In some optional embodiments, the depth of the first mounting groove 605 may be greater than or equal to half the thickness of the first current collecting member 601. The width of the first mounting groove 605 may be greater than or equal to 0.1 mm. The depth of the second mounting groove 606 may be greater than or equal to half the thickness of the second current collecting member 602. The width of the second mounting groove 606 may be greater than or equal to 0.1 mm, and the length of the connector 603 may be greater than or equal to 50 mm. The length of the connector 603 may be the length of the path along which the connector 603 extends along the surface of the first mounting groove 605. The length of the connector 603 may be the length of the path along which the connector 603 extends along the surface of the first mounting groove 605.

[0062] The above structure can ensure the connection strength between the first current collecting member 601 and the second current collecting member 602 , ensure sufficient flow area between the first current collecting member 601 and the second current collecting member 602 , and improve the operating stability of the battery cell 7 .

[0063] In an embodiment of the present application, the first current collector 601 can be made of the same material as the pole ear of the electrode assembly 10, and can be made of metal copper. The second current collector 602 can be made of the same material as the end cap 30, and can be made of steel. The same material has the same melting point, and the welding structure is more stable. Therefore, the above structure can improve the strength of the connection between the first current collector 601 and the pole ear, and at the same time improve the strength of the connection between the second current collector 602 and the end cap 30.

[0064] Furthermore, the first current collector 601 and the second current collector 602 can be welded before being installed in the shell 20. For example, the welding material can be placed in the first installation groove 605 and the second installation groove 606 and then heated and cooled to form. Alternatively, the first current collector 601 and the second current collector 602 can be stacked and welded to melt and connect part of the material of the first current collector 601 or the second current collector 602. After welding, the welded current collector assembly can also be detected for cold welding to reduce the probability of cold welding and improve the strength of the welding structure.

[0065] In some embodiments of the present application, the first mounting groove 605 is arranged along the circumference of the first current collecting member 601 and forms a closed annular groove. In the above structure, the first mounting groove 605 is set as a closed annular groove, which can increase the space for the connection member 603 to be set, improve the strength of the connection between the connection member 603 and the first current collecting member 601 and the second current collecting member 602, and can evenly distribute the connection force to the first current collecting member 601, thereby improving the stability of the connection between the first current collecting member 601 and the second current collecting member 602.

[0066] In some optional embodiments, the second mounting groove 606 is arranged along the circumference of the second current collecting member 602 to form a closed annular groove, and the second mounting groove 606 is arranged in the thickness direction corresponding to the first mounting groove 605. In the above structure, the second mounting groove 606 is arranged corresponding to the first mounting groove 605, which can improve the strength and connection stability of the first current collecting member 601 and the second current collecting member 602.

[0067] In some embodiments of the present application, the second mounting groove 606 penetrates the second current collecting member 602 in the thickness direction. In the above structure, the second mounting groove 606 penetrates the second current collecting member 602, and the connecting member 603 can penetrate the second current collecting member 602 in the thickness direction, thereby improving the strength of the connection between the connecting member 603 and the second current collecting member 602, thereby improving the strength of the connection between the first current collecting member 601 and the second current collecting member 602.

[0068] In some embodiments of the present application, the connector 603 includes a first part 607 and a second part 608, and the first part 607 is filled in the first mounting groove 605. The second part 608 is filled in the second mounting groove 606, and the second part 608 and the first part 607 are integrally formed. The integrally formed structure can be melt-welded using the same welding material and then cooled and formed. In the above structure, the connector 603 is set as an integrally formed structure, which improves the strength of the connection between the first current collector 601 and the second current collector 602 and the efficiency of the assembly of the current collecting disc assembly 6.

[0069] In some embodiments of the present application, the connector 603 further includes a third portion 609, which extends along a side of the second portion 608 away from the first portion 607 and protrudes from a surface of the second current collector 602 away from the first current collector 601. The thickness of the exemplary third portion 609 is less than or equal to 0.1 mm. In the above structure, the third portion 609 is protrudingly arranged, which extends the thickness of the connector 603 and increases the connection strength between the connector 603 and the second current collector 602, thereby improving the connection strength and stability of the first current collector 601 and the second current collector 602.

[0070] like Figure 8 As shown, in some embodiments of the present application, the second current collector 602 is used to be arranged toward the pressure relief mechanism, and the side surface of the second current collector 602 facing the pressure relief mechanism is concave to form an avoidance groove 610, and the positive projection of the pressure relief mechanism on the second current collector 602 completely falls into the avoidance groove 610. Optionally, the avoidance groove 610 penetrates along the thickness direction of the second current collector 602. In the above technical solution, by setting the avoidance groove 610, the risk of interference between the second current collector 602 and the pressure relief mechanism is reduced, the efficiency of opening the pressure relief mechanism is improved, the probability of failure of the pressure relief mechanism inside the battery cell 7 is reduced, and the stability of the operation of the battery cell 7 is improved.

[0071] In some embodiments of the present application, the second current collector 602 includes a connecting portion 611 and a supporting portion 612. The connecting portion 611 is arranged circumferentially along the first current collector 601, and the second mounting groove 606 is arranged on the connecting portion 611. The supporting portion 612 extends along the edge of the connecting portion 611 toward the center of the first current collector 601. Exemplarily, the center of the first current collector 601 can be an axial center. During the welding process of the first current collector 601 and the electrode assembly 10, the first current collector 601 is partially heated and melted and moves toward the avoidance groove 610 of the second current collector 602, and forms a deformation structure after cooling. Therefore, in order to improve the structural strength at the avoidance groove 610, a plurality of supporting portions 612 can be provided to press the melted portion of the first current collector 601 and the pole ear to reduce the risk of deformation of the first current collector 601.

[0072] In the above technical solution, the connection strength between the first current collecting plate and the second current collecting part 602 is improved by setting the connecting part 611, and the structural strength of the avoidance groove 610 is improved by setting the supporting part 612, thereby reducing the probability of deformation of the first current collecting part 601 during the welding process, and improving the connection strength between the first current collecting part 601 and the second current collecting part 602.

[0073] The embodiment of the present application further provides a battery cell 7, which includes the current collecting plate assembly 6 in the above embodiment. The embodiment of the present application provides a battery 2, which includes the battery cell 7 in the above embodiment. The embodiment of the present application provides an electrical device, which includes the battery 2 in the above embodiment, and the battery 2 is used to provide electrical energy.

[0074] The battery cell 7, battery 2 and electrical device in the present application all include the current collecting plate assembly 6 in the above embodiment, in which the current collecting plate assembly 6 is provided with a first current collecting member 601 for connecting with the electrode assembly 10, and a second current collecting member 602 for connecting with the end cover 30. In addition, a first mounting groove 605 and a second mounting groove 606 are provided in the first current collecting member 601 and the second current collecting member 602, respectively, and a connecting member 603 is provided in the first mounting groove 605 and the second mounting groove 606 to connect the first current collecting member 601 and the second current collecting member 602. The above structure can be welded and assembled outside the shell 20 of the battery cell 7, reducing the risk of cracks caused by welding the first current collecting member 601 and the second current collecting member 602 inside the shell 20, while improving the strength of the connection between the electrode assembly 10 and the end cover 30 in the battery cell 7, and improving the stability of the operation of the battery cell 7.

[0075] 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 collecting plate assembly (6), characterized in that: include: A first current collector (601) used for connecting an electrode assembly (10) of a battery cell (7), wherein the first current collector (601) has a first surface (604), and the first surface (604) is concave to form a first mounting groove (605); a second current collecting member (602) stacked with the first current collecting member (601), the second current collecting member (602) being used to connect the end cover (30) of the battery cell (7), the second current collecting member (602) being arranged toward the first surface (604), and a second concave mounting groove (606) being provided on the surface of the second current collecting member (602) facing the first mounting groove (605); A connecting member (603) is provided in the first installation groove (605) and the second installation groove (606) to connect the first current collecting member (601) and the second current collecting member (602).

2. The collecting plate assembly (6) according to claim 1, characterized in that: The first mounting groove (605) is arranged along the circumference of the first current collecting member (601) and forms a closed annular groove.

3. The collecting plate assembly (6) according to claim 1, characterized in that: The second installation groove (606) penetrates the second current collecting member (602) along the thickness direction.

4. The collecting plate assembly (6) according to claim 1, characterized in that: The connecting member (603) comprises: A first portion (607), filled in the first mounting groove (605); The second part (608) is filled in the second installation groove (606), and the second part (608) and the first part (607) are integrally formed.

5. The collecting plate assembly (6) according to claim 4, characterized in that: The connecting member (603) further comprises a third portion (609), wherein the third portion (609) extends along a side of the second portion (608) away from the first portion (607) and protrudes from a surface of the second current collecting member (602) away from the first current collecting member (601).

6. The collecting plate assembly (6) according to any one of claims 1 to 5, characterized in that: The second current collector (602) is used to be arranged toward the pressure relief mechanism of the battery cell (7); a side surface of the second current collector (602) facing the pressure relief mechanism of the battery cell (7) is concave to form an avoidance groove (610); and the orthographic projection of the pressure relief mechanism of the battery cell (7) on the second current collector (602) completely falls into the avoidance groove (610).

7. The collecting plate assembly (6) according to claim 6, characterized in that: The second current collecting member (602) comprises: A connecting portion (611) is arranged along the circumference of the first current collecting member (601), and the second mounting groove (606) is arranged on the connecting portion (611); A supporting portion (612) extends along an edge of the connecting portion (611) toward a center of the first current collecting member (601).

8. A battery cell (7), characterized in that: It comprises a collecting plate assembly (6) as claimed in any one of claims 1 to 7.

9. A battery (2), characterized in that: Comprising the battery cell (7) as claimed in claim 8.

10. An electrical device, characterized in that: The electrical device comprises the battery (2) as claimed in claim 9, and the battery (2) is used to provide electrical energy.

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