Battery cells, battery devices and electrical equipment

Abstract

The present application discloses a battery cell, a battery device and an electrical device, a battery cell housing, an electrode assembly, an insulating layer and a support assembly. The housing includes a first wall, on which a pressure relief mechanism is provided. The electrode assembly is disposed in the housing. The insulating layer is coated on the outside of the electrode assembly, and the insulating layer is used to insulate the housing and the electrode assembly. The support assembly is disposed between the first wall and the insulating layer, and the support assembly includes a support plate and a protrusion. The support plate is disposed opposite to the first wall. The protrusion protrudes along the surface of the support plate on one side away from the electrode assembly to support the support plate and the first wall to form a preset interval, and the support plate is fused to the insulating layer. The above structure can improve the stability of the battery cell during operation and reduce the risk of accidents such as rupture of the battery cell housing or combustion and explosion of the battery cell.

Description

Technical Field

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

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

[0003] At present, how to improve the stability of battery cells during operation and reduce the incidence of accidents such as combustion and explosion is one of the issues being studied in this field. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electrical equipment, which can improve the stability of the battery cell operation process and reduce the risk of accidents such as combustion or explosion of the battery cell.

[0005] In a first aspect, the present application provides a battery cell, comprising a shell, an electrode assembly, an insulating layer and a support assembly. The shell comprises a first wall, on which a pressure relief mechanism is provided. The electrode assembly is disposed in the shell. The insulating layer is coated on the outside of the electrode assembly, and the insulating layer is used to insulate the shell and the electrode assembly. The support assembly is disposed between the first wall and the insulating layer, and the support assembly comprises a support plate and a protrusion. The support plate is disposed opposite to the first wall. The protrusion protrudes along a side surface of the support plate away from the electrode assembly to support the support plate and the first wall to form a preset interval, and the support plate is fused to the insulating layer.

[0006] In the technical solution of the embodiment of the present application, a shell is provided to provide a stable environment for the electrode assembly, thereby improving the stability of the battery cell operation. A pressure relief mechanism is provided on the shell to release the gas inside the shell when it reaches a threshold value, thereby reducing the risk of shell rupture or even combustion or explosion caused by excessive temperature or pressure inside the battery cell. A support assembly is provided between the electrode assembly and the shell, and a support plate of the support assembly is connected to the electrode assembly and supports the electrode assembly. The protrusion is provided between the support plate and the first wall, and a preset interval is formed between the support plate and the first wall. The gas generated inside the electrode assembly can flow to the pressure relief mechanism through the preset interval, so that the pressure relief mechanism can smoothly open the valve, thereby improving the stability of the battery cell during operation. The provision of an insulating layer increases the creepage distance between the electrode assembly and the shell, thereby improving the insulation performance. In particular, the support plate and the insulating layer are welded, thereby improving the convenience of the support assembly installation and the connection stability between the support plate and the electrode assembly. At the same time, it is convenient to assemble the support assembly and the electrode assembly into the shell at the same time, which is well adapted to the existing assembly equipment and improves the assembly efficiency.

[0007] In some embodiments, the support plate includes a first connection layer and a support layer. The first connection layer is welded to the insulating layer, and the support layer is stacked on the side of the first connection layer away from the electrode assembly. The protrusion is connected to the side of the support layer away from the first connection layer, and the material melting point of the first connection layer is P1, P1≤280°C. In the above structure, a low melting point material is selected to manufacture the first connection layer, which can melt under high temperature and form a good fusion with the insulating layer, thereby improving the connection strength and stability between the first connection layer and the insulating layer.

[0008] In some embodiments, the melting point of the material of the protrusion is P2, and P2-P1≥100° C. In the above structure, by increasing the melting point of the material of the protrusion, the risk of the protrusion melting under high temperature conditions is reduced, and the risk of the support plate and the first wall being attached due to loss of support and thus blocking the pressure relief mechanism is reduced, so that the pressure relief mechanism can be opened smoothly, and the stability of the battery cell operation process is improved.

[0009] In some embodiments, the electrode assembly includes a straight portion and a bent portion connected to each other, and the number of the protrusions is multiple, and the multiple protrusions are arranged in sequence along the direction from the bent portion to the straight portion. In the above structure, multiple protrusions are arranged to improve the support strength and support stability of the support plate and the electrode assembly. The protrusions are arranged along the width direction of the battery cell to form a gas channel along the width direction, shorten the flow path of the gas, improve the flow performance of the gas, and reduce the local accumulation of the gas.

[0010] In some embodiments, the housing further includes a second wall and an electrode terminal, the second wall is arranged opposite to the first wall, and the electrode terminal is arranged on the second wall. In the above structure, by arranging the electrode terminal, the electric energy generated by the electrode assembly can be transmitted, and the electrode assembly and the pressure relief structure are arranged on opposite sides of the battery cell, which can reduce the damage caused by the substances discharged from the pressure relief mechanism to the electrode terminal and the electrical components connected to the electrode terminal, thereby improving the reliability of the operation of the battery cell.

[0011] In some embodiments, the protrusion and the support layer are an integrally formed structure. The above structure improves the manufacturing efficiency and assembly efficiency of the support assembly.

[0012] In some embodiments, the surface of the support layer facing the first connection layer is concave to form a connection hole, and a portion of the first connection layer extends into the connection hole. The above structure increases the contact area between the first connection layer and the support layer by providing the connection hole, thereby improving the connection strength between the first connection layer and the support layer.

[0013] In some embodiments, the first connection layer is welded to the insulating layer. The above structure improves the strength of the connection between the support plate and the insulating layer by welding the first connection layer to the insulating layer, reduces the connection failure caused by melting of the adhesive, improves the stability of the connection structure, and improves the gas flowability between the electrode assembly and the first wall.

[0014] In some embodiments, the support plate further includes a second connection layer, which is disposed on a side of the support layer away from the first connection layer, and the material melting point of the second connection layer is lower than the material melting point of the support layer. A through hole is provided on the support layer, and at least a portion of the second connection layer extends into the through hole and is connected to the first connection layer. In the above structure, by providing the second connection layer, the first connection layer is connected from the other side of the support layer, thereby improving the connection stability between the first connection layer and the support layer, thereby improving the stability between the support layer and the electrode assembly.

[0015] In some embodiments, a avoidance hole is provided on the second connection layer at a position corresponding to the protrusion. In the above structure, the avoidance hole is provided to facilitate forming a preset interval between the protrusion and the first wall.

[0016] In a second aspect, the present application provides a battery device, which includes the battery cell in the above embodiment.

[0017] In a third aspect, the present application provides an electrical device, which includes the battery device in the above embodiment, and the battery device is used to provide electrical energy.

[0018] 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

[0019] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0020] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0021] Figure 2 A schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application;

[0022] Figure 3 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application;

[0023] Figure 4 A schematic diagram of the exploded structure of a support assembly provided in some embodiments of the present application;

[0024] Figure 5A schematic diagram of the structure of a support assembly provided in some embodiments of the present application;

[0025] Figure 6 A schematic diagram of the exploded structure of a support assembly provided in some other embodiments of the present application;

[0026] Figure 7 A schematic diagram of the structure of the support assembly provided for some other embodiments of the present application.

[0027] DETAILED DESCRIPTION OF REFERENCE NUMERALS

[0028] 1. Vehicle; 2. Battery device; 3. Controller; 4. Motor; 5. Box; 51. First box part; 52. Second box part; 53. Accommodation space; 6. Battery cell; 10. Electrode assembly; 11. Straight part; 12. Bend part; 20. Shell; 21. First wall; 22. Second wall; 25. Electrode terminal; 30. End cover; 40. Shell; 50. Insulating layer; 7. Support assembly; 701. Support plate; 702. Raised part; 703. First connecting layer; 704. Support layer; 705. Second connecting layer; 706. Avoidance hole. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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).

[0035] 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.

[0036] 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.

[0037] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0038] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0039] During the operation of the battery cell, high-temperature gas is usually generated. The high-temperature gas causes the pressure inside the battery cell to increase, which may cause the shell to rupture, and even cause dangers such as combustion and explosion. In order to reduce the accumulation of gas inside the battery cell, a pressure relief mechanism can be set on the outer shell of the battery cell. When the temperature or pressure inside the battery cell reaches a preset value, it will be opened to release the substances inside the battery cell, reducing the risk of accidents such as shell rupture, combustion or explosion.

[0040] In order to increase the internal space utilization rate of the battery cell and improve the energy density of the battery cell, the size of the electrode assembly is getting larger and larger, and the electrode assembly in the battery cell is tightly fitted with the outer shell. The pressure relief mechanism is arranged on the first wall, and the fit between the electrode assembly and the first wall will cause the internal gas to be unable to be discharged normally. Therefore, a support assembly can be arranged between the first wall and the electrode assembly, and the support assembly can form an exhaust channel between the first wall and the electrode assembly, so that the gas can smoothly move to the pressure relief mechanism for discharge. However, the assembly equipment is usually matched with the shape of the electrode assembly. After the support assembly is added, a new assembly mechanism needs to be added to match it, which increases the cost and reduces the assembly efficiency. Therefore, how to quickly and accurately assemble the support assembly into the outer shell to adapt to the existing assembly equipment is also a problem that needs to be solved.

[0041] Based on the above problems, the embodiment of the present application provides a battery cell, in which an insulating layer is provided outside the electrode assembly to increase the creepage distance between the electrode assembly and the housing, thereby improving the insulation performance. In particular, the support plate and the insulating layer are welded to improve the convenience of the support assembly installation and the connection stability between the support plate and the electrode assembly. At the same time, it is convenient to assemble the support assembly and the electrode assembly into the housing at the same time, which is well adapted to the existing assembly equipment and improves the assembly efficiency.

[0042] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0043] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, and a battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0044] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0045] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0046] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0047] In the embodiment of the present application, the battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0048] Battery cells may include but are not limited to lithium ion battery cells, sodium ion battery cells, sodium lithium ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium sulfur battery cells, magnesium ion battery cells, nickel metal hydride battery cells, nickel cadmium battery cells, lead storage battery cells, etc.

[0049] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no particular limitation in the present application.

[0050] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0051] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0052] The battery device disclosed in the embodiments of the present application can be used in various energy storage systems that use the battery device as a power source or use the battery device as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0053] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0054] Figure 1A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0055] like Figure 1 As shown, a battery device 2 is disposed inside the vehicle 1, and the battery device 2 may be disposed at the bottom, head, or tail of the vehicle 1. The battery device 2 may be used to power the vehicle 1, for example, the battery device 2 may be used as an operating power source for the vehicle 1.

[0056] The vehicle 1 may further include a controller 3 and a motor 4 , wherein the controller 3 is used to control the battery device 2 to supply power to the motor 4 , for example, to meet the power requirements of starting, navigating and driving the vehicle 1 .

[0057] In some embodiments of the present application, the battery device 2 can not only serve as an operating power source for the vehicle 1, but also serve 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.

[0058] Figure 2 Schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application.

[0059] The box 5 is used to accommodate the battery cell 6, and the box 5 can be of various structures. In some embodiments, the box 5 can include a first box portion 51 and a second box portion 52, the first box portion 51 and the second box portion 52 cover each other, and the first box portion 51 and the second box portion 52 jointly define a storage space 53 for accommodating the battery cell. The first box portion 51 can be a hollow structure with one end open, and the second box portion 52 is a plate-like structure, and the second box portion 52 covers the open side of the first box portion 51 to form a box 5 with a storage space 53; the first box portion 51 and the second box portion 52 can also be hollow structures with one side open, and the open side of the first box portion 51 covers the open side of the second box portion 52 to form a box 5 with a storage space 53. Of course, the first box portion 51 and the second box portion 52 can be of various shapes, such as a cylinder, a cuboid, etc.

[0060] In order to improve the sealing performance after the first box body 51 and the second box body 52 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 51 and the second box body 52 .

[0061] Assuming that the first box body portion 51 covers the top of the second box body portion 52 , the first box body portion 51 can also be referred to as an upper box cover, and the second box body portion 52 can also be referred to as a lower box body.

[0062] In the battery device 2, the battery cell 6 can be one or more. If there are more than one battery cell 6, the battery cells 6 can be connected in series, in parallel or in mixed connection. Mixed connection means that the battery cells 6 are both connected in series and in parallel. The battery cells 6 can be directly connected in series, in parallel or in mixed connection, and then the whole formed by the battery cells 6 is accommodated in the box 5; of course, the battery cells can also be connected in series, in parallel or in mixed connection to form a battery module, and then the battery modules are connected in series, in parallel or in mixed connection to form a whole, and then accommodated in the box 5.

[0063] In some optional embodiments, the battery cells 6 may also be directly accommodated in the box body 5 to reduce the connecting components or supporting components required to form the battery module and improve the energy density of the battery device 2 .

[0064] For example, the battery cell 6 may be the smallest unit constituting the battery device 2 .

[0065] Figure 3 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0066] like Figure 3 As shown, in some embodiments, the battery cell 6 includes a housing 40 and an electrode assembly 10 accommodated in the housing 40 .

[0067] The electrode assembly 10 includes a positive electrode and a negative electrode. During the charge and discharge process of the battery cell 6, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. Optionally, the electrode assembly 10 also includes a separator disposed between the positive electrode and the negative electrode, which can reduce the risk of short circuit between the positive and negative electrodes while allowing active ions to pass through.

[0068] The housing 40 is used to encapsulate the electrode assembly 10 and the electrolyte and other components. The housing 40 may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing 40 ), or an aluminum-plastic film.

[0069] In some embodiments, the housing 40 includes a shell 20 and an end cover 30 . The shell 20 has an opening, and the end cover 30 is used to cover the opening.

[0070] In some embodiments, the battery cell 6 further includes an electrolyte contained in the housing 40. The electrolyte plays a role in conducting ions between the positive and negative electrodes and can be in liquid, gel or solid state.

[0071] In some embodiments, the battery cell 6 includes an electrode terminal 25 . The electrode terminal 25 is electrically connected to the electrode assembly 10 to output or input electrical energy of the battery cell 6 .

[0072] In some embodiments, the battery cell 6 includes a pressure relief mechanism, which is used to rupture when the internal pressure of the battery cell 6 exceeds a threshold value to release the pressure inside the battery cell 6. Specifically, the pressure relief mechanism can be an element or component that is activated when the battery cell 6 reaches a certain condition.

[0073] Please refer to Figures 3 to 5 , Figure 3 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application, Figure 4 A schematic diagram of the exploded structure of a support assembly provided in some embodiments of the present application, Figure 5 A schematic diagram of the structure of a support assembly provided for some embodiments of the present application.

[0074] As shown in the figure, an embodiment of the present application provides a battery cell 6, including a shell 40, an electrode assembly 10, an insulating layer 50 and a support assembly 7. The shell 40 includes a first wall 21, and a pressure relief mechanism is provided on the first wall 21. The electrode assembly 10 is arranged in the shell 40. The insulating layer 50 is coated on the outside of the electrode assembly 10, and the insulating layer 50 is used to insulate the shell 40 and the electrode assembly 10. The support assembly 7 is arranged between the first wall 21 and the insulating layer 50, and the support assembly 7 includes a support plate 701 and a protrusion 702. The support plate 701 is arranged opposite to the first wall 21. The protrusion 702 protrudes along the side surface of the support plate 701 away from the electrode assembly 10, so as to support the support plate 701 and the first wall 21 to form a preset interval, and the support plate 701 is welded to the insulating layer 50.

[0075] Optionally, the housing 40 includes an end cover 30 and a shell 20, the shell 20 includes a bottom plate and a plurality of side plates, the bottom plate is arranged opposite to the end cover 30. The first wall 21 may be the end cover 30 or the bottom plate, or the first wall 21 may also be a side plate. The pressure relief mechanism includes an explosion-proof valve.

[0076] Exemplarily, a pressure relief hole is provided on the first wall 21, and a pressure relief mechanism is arranged in the pressure relief hole. The pressure relief mechanism includes a pressure relief sheet, and a weak portion can be arranged on the pressure relief sheet. The weak portion can be broken under a certain pressure to release the substance inside the housing 40.

[0077] The support plate 701 of the support assembly 7 can be formed to match the first wall 21 to form a comprehensive support for the electrode assembly 10. The protrusion 702 can be a block structure. The protrusion 702 can be made of a material with good heat resistance, corrosion resistance and high strength. Exemplarily, it can be made of materials such as stainless steel, aluminum alloy, silicone or glass. The end face of the protrusion 702 facing the first wall 21 is a plane, which facilitates the formation of two boxes between the protrusion 702 and the first wall 21, thereby improving the support stability.

[0078] The insulating layer 50 is coated on the outside of the electrode assembly 10, and the insulating layer 50 is used to insulate the housing 40 and the electrode assembly 10. Exemplarily, the insulating layer is made of a material with high resistivity and good voltage resistance, such as a polymer, ceramic or composite material. These materials can effectively block the passage of current and maintain stable insulation performance even under high voltage conditions. Therefore, by providing an insulating layer, the insulation performance of the battery cell 6 can be significantly improved and the risk of electrical failure can be reduced.

[0079] The first connection layer 703 is fused to the insulating layer 50. For example, the first connection layer 703 and the insulating layer 50 can be made of the same material to improve the stability of the hot-melt connection between the two materials.

[0080] Welding refers to melting the first connecting layer 703 and the insulating layer 50 by high-temperature heating, mixing the two melted materials, and forming a stable connection between the two after cooling. The above structure improves the strength of the connection between the support plate 701 and the insulating layer 50 by welding the first connecting layer 703 and the insulating layer, and reduces the connection failure caused by the melting of the adhesive. In the technical solution of the embodiment of the present application, the outer shell 40 is provided to provide a stable environment for the electrode assembly 10, thereby improving the stability of the operation of the battery cell 6. A pressure relief mechanism is provided on the outer shell 40 to release the gas inside the outer shell 40 when the gas reaches a threshold value, thereby reducing the risk of the outer shell 40 rupturing or even burning or exploding due to excessive temperature or pressure inside the battery cell 6. A support assembly 7 is provided between the electrode assembly 10 and the housing 40. The support plate 701 of the support assembly 7 is connected to the electrode assembly 10 and supports the electrode assembly 10. The protrusion 702 is provided between the support plate 701 and the first wall 21, and a preset interval is formed between the support plate 701 and the first wall 21. The gas generated inside the electrode assembly 10 can flow to the pressure relief mechanism through the preset interval, so that the pressure relief mechanism can smoothly open the valve, thereby improving the stability of the battery cell 6 during operation. The provision of the insulating layer 50 increases the creepage distance between the electrode assembly 10 and the housing 40 and improves the insulation performance. In particular, the support plate 701 is welded to the insulating layer 50, which improves the convenience of installing the support assembly 7 and the connection stability between the support plate 701 and the electrode assembly 10. At the same time, it is convenient to assemble the support assembly 7 and the electrode assembly 10 into the housing 40 at the same time, which is well adapted to the existing assembly equipment and improves the efficiency of assembly.

[0081] In some embodiments of the present application, the support plate 701 includes a first connection layer 703 and a support layer 704. The first connection layer 703 is welded to the insulating layer 50, and the support layer 704 is stacked on the side of the first connection layer 703 away from the electrode assembly 10. The protrusion 702 is connected to the side of the support layer 704 away from the first connection layer 703, and the material melting point P1 of the first connection layer 703 is P1≤280°C. In the above structure, a low melting point material is selected to manufacture the first connection layer 703, which can melt under high temperature and form a good fusion with the insulating layer 50, thereby improving the connection strength and stability between the first connection layer 703 and the insulating layer 50.

[0082] In some embodiments of the present application, the material melting point of the protrusion 702 is P2, P2-P1≥100° C. For example, the protrusion 702 can be made of polyimide material. Polyimide is corrosion-resistant, high-temperature-resistant and has a certain structural strength, and will not melt under high temperature.

[0083] In the above structure, by increasing the melting point of the material of the protrusion 702, the risk of the protrusion 702 melting under high temperature conditions is reduced, and the risk of the support plate 701 and the first wall 21 being attached together due to loss of support and thus blocking the pressure relief mechanism is reduced, so that the pressure relief mechanism can be opened smoothly, thereby improving the stability of the battery cell 6 during operation.

[0084] In some embodiments of the present application, the electrode assembly 10 includes a straight portion 11 and a bent portion 12 connected to each other, and there are multiple protrusions 702 , which are arranged in sequence along the direction from the bent portion 12 toward the straight portion 11 .

[0085] In the above structure, a plurality of protrusions 702 are provided to improve the support strength and support stability of the support plate 701 and the electrode assembly 10. The protrusions 702 are provided along the width direction of the battery cell 6 to form a gas channel along the width direction, thereby shortening the gas flow path, improving the gas flow performance, and reducing the local accumulation of the gas.

[0086] In some embodiments of the present application, the housing 40 further includes a second wall 22 and an electrode terminal 25 . The second wall 22 is disposed opposite to the first wall 21 , and the electrode terminal 25 is disposed on the second wall 22 .

[0087] The electrode terminal is an important interface between the battery cell 6 and the external circuit, and is responsible for transmitting the electric energy generated by the electrode assembly 10 to the external device. By providing the electrode terminal 25, the battery cell 6 can be conveniently connected to various electronic systems, equipment or energy storage devices to achieve the conversion and storage of electric energy. The electrode terminal 25 is usually also connected to electrical components such as a bar.

[0088] In the above structure, by setting the electrode terminal 25, the electric energy generated by the electrode assembly 10 can be transmitted, and the electrode assembly 10 and the pressure relief structure are set on the opposite sides of the battery cell 6. The damage to the electrode terminal 25 and the electrical components connected to the electrode terminal 25 caused by the substances discharged from the pressure relief mechanism can be reduced, thereby improving the reliability of the operation of the battery cell 6.

[0089] In some embodiments of the present application, the raised portion 702 and the support layer 704 are an integrally formed structure. An integrally formed structure means that during the manufacturing process, the raised portion 702 and the support layer 704 are directly formed through the same process or continuous processes, without the need for separate assembly or connection. This not only simplifies the production process, but also reduces the errors and defective rates that may be introduced due to multiple processing and assembly. In addition, the integral molding technology can usually use efficient tools such as molds to achieve large-scale, high-precision production, further improving manufacturing efficiency.

[0090] The above structure designs the protrusion 702 and the support layer 704 as an integrally formed structure, which not only improves the manufacturing efficiency of the support assembly 7, but also improves the assembly efficiency. This design simplifies the production process, reduces production costs, improves product quality and reliability, and provides strong support for the rapid production and wide application of the battery cell 6.

[0091] In some embodiments of the present application, a surface of one side of the support layer 704 facing the first connection layer 703 is concave to form a connection hole, and a portion of the first connection layer 703 extends into the connection hole.

[0092] The first connection layer 703 can be partially embedded in the support layer 704 during assembly, thereby forming more contact points. Compared with planar contact, this embedded contact significantly increases the contact area. A larger contact area means a wider force transmission path and higher stress dispersion capability, thereby improving the overall stability and durability of the connection structure.

[0093] The above structure can improve the connection strength and stability between the first connection layer 703 and the support layer 704 by providing a connection hole on the support layer 704 and allowing part of the first connection layer 703 to extend therein, which not only enhances the overall performance of the internal structure of the battery cell 6, but also provides a guarantee for its reliable operation in various complex working environments.

[0094] like Figure 6 as well as Figure 7As shown, in some embodiments of the present application, the support plate 701 further includes a second connection layer 705, which is disposed on a side of the support layer 704 away from the first connection layer 703, and the material melting point of the second connection layer 705 is lower than the material melting point of the support layer 704. A through hole is disposed on the support layer 704, and at least a portion of the second connection layer 705 extends into the through hole and is connected to the first connection layer 703. Exemplarily, the first connection layer 703 and the second connection layer 705 can be made of the same material to improve the connection stability of the first connection layer 703 and the second connection layer 705.

[0095] In the above structure, by providing the second connection layer 705 and connecting the first connection layer 703 from the other side of the support layer 704, the connection stability between the first connection layer 703 and the support layer 704 is improved, thereby improving the stability between the support layer 704 and the electrode assembly 10.

[0096] In some optional embodiments, the first connection layer 703 and the second connection layer 705 may be an integrally formed structure. Exemplarily, the support layer 704 may be placed in a mold, and then the material may be injected to form the first connection layer 703 and the second connection layer 705. The above structure improves the connection strength between the first connection layer 703 and the second connection layer 705. The first connection layer 703 and the second connection layer 705 are connected to the support layer 704 from both sides, respectively, which improves the overall structural stability of the support plate 701, thereby improving the connection stability between the support layer 704 and the electrode assembly 10.

[0097] In some embodiments of the present application, a avoidance hole 706 is provided on the second connection layer 705 at a position corresponding to the protrusion 702. In the above structure, the avoidance hole 706 is provided to facilitate forming a preset interval between the protrusion 702 and the first wall 21. The design of the avoidance hole 706 also reduces the space occupied by the second connection layer 705, thereby improving the energy density of the battery cell 6.

[0098] In some optional embodiments, the battery cell 6 includes a shell 40, an electrode assembly 10, an insulating layer 50 and a support assembly 7. The shell 40 includes a first wall 21, and a pressure relief mechanism is provided on the first wall 21. The electrode assembly 10 is arranged in the shell 40. The insulating layer 50 is coated on the outside of the electrode assembly 10, and the insulating layer 50 is used to insulate the shell 40 and the electrode assembly 10. The support assembly 7 is arranged between the first wall 21 and the insulating layer 50, and the support assembly 7 includes a support plate 701 and a protrusion 702. The support plate 701 is arranged opposite to the first wall 21. The protrusion 702 protrudes along the side surface of the support plate 701 away from the electrode assembly 10 to support the support plate 701 and the first wall 21 to form a preset interval, and the support plate 701 is welded to the insulating layer 50. The support plate 701 includes a first connecting layer 703 and a support layer 704. The first connection layer 703 is welded to the insulating layer 50, and the support layer 704 is stacked on the side of the first connection layer 703 away from the electrode assembly 10. The protrusion 702 is connected to the side of the support layer 704 away from the first connection layer 703, and the material melting point of the first connection layer 703 is P1, P1≤280°C. The material melting point of the protrusion 702 is P2, P2-P1≥100°C.

[0099] The electrode assembly 10 includes a straight portion 11 and a bent portion 12 connected to each other, and the number of the protrusions 702 is multiple, and the multiple protrusions 702 are sequentially spaced in the direction from the bent portion 12 to the straight portion 11. The housing 40 also includes a second wall 22 and an electrode terminal 25, the second wall 22 is arranged opposite to the first wall 21, and the electrode terminal 25 is arranged on the second wall 22. The support plate 701 also includes a second connection layer 705, the second connection layer 705 is arranged on the side of the support layer 704 away from the first connection layer 703, and the melting point of the material of the second connection layer 705 is lower than the melting point of the material of the support layer 704. A through hole is provided on the support layer 704, and at least a part of the second connection layer 705 extends into the through hole and is connected to the first connection layer 703.

[0100] The embodiment of the present application provides a battery device 2, which includes the battery cell 6 in the above embodiment. The embodiment of the present application also provides an electric device, which includes the battery device 2 in the above embodiment, and the battery device 2 is used to provide electric energy.

[0101] The battery device 2 and the electrical equipment mentioned above both include the battery cell 6 in the above embodiment, and the housing 40 is provided to provide a stable environment for the electrode assembly 10, thereby improving the stability of the operation of the battery cell 6. A pressure relief mechanism is provided on the housing 40, and the gas inside the housing 40 is released when the gas reaches a threshold value, thereby reducing the risk of the housing 20 rupturing or even burning or exploding due to excessive temperature or pressure inside the battery cell 6. A support assembly 7 is provided between the electrode assembly 10 and the housing 40, and the support plate 701 of the support assembly 7 is connected to the electrode assembly 10 and supports the electrode assembly 10. The protrusion 702 is provided between the support plate 701 and the first wall 21, and a preset interval is formed between the support plate 701 and the first wall 21. The gas generated inside the electrode assembly 10 can flow to the pressure relief mechanism through the preset interval, so that the pressure relief mechanism can open the valve smoothly, thereby improving the stability of the battery cell 6 during operation.

[0102] 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: The housing comprises a first wall, wherein the first wall is provided with a pressure relief mechanism; An electrode assembly, disposed in the housing; An insulating layer, covering the outer side of the electrode assembly, and used for insulating the outer shell and the electrode assembly; A support assembly is arranged between the first wall and the insulating layer, and includes a support plate and a protrusion. The support plate is arranged opposite to the first wall, and the protrusion protrudes along a surface of the support plate that is away from the electrode assembly to support the support plate and the first wall to form a preset interval, and the support plate is fused to the insulating layer.

2. The battery cell according to claim 1, characterized in that: The support plate comprises: A first connecting layer, welded to the insulating layer; The support layer is stacked on the side of the first connection layer away from the electrode assembly, the protrusion is connected to the side of the support layer away from the first connection layer, and the material melting point of the first connection layer is P1, P1≤280°C.

3. The battery cell according to claim 2, characterized in that: The melting point of the material of the protrusion is P2, and P2-P1≥100°C.

4. The battery cell according to claim 1, characterized in that: The electrode assembly includes a straight portion and a bent portion connected to each other. There are a plurality of protruding portions, and the plurality of protruding portions are sequentially spaced from each other in a direction from the bent portion toward the straight portion.

5. The battery cell according to claim 1, characterized in that: The housing further includes a second wall and an electrode terminal. The second wall is arranged opposite to the first wall, and the electrode terminal is arranged on the second wall.

6. The battery cell according to claim 2, characterized in that: The protrusion and the support layer are an integrally formed structure.

7. The battery cell according to claim 6, characterized in that: A surface of one side of the support layer facing the first connection layer is concave to form a connection hole, and a portion of the first connection layer extends into the connection hole.

8. The battery cell according to claim 6, characterized in that: The first connection layer is connected to the insulation layer.

9. The battery cell according to claim 8, characterized in that: The first connection layer is fused to the insulation layer.

10. The battery cell according to any one of claims 6 to 9, characterized in that: The support plate further includes a second connection layer, which is disposed on a side of the support layer away from the first connection layer, and the melting point of the material of the second connection layer is lower than the melting point of the material of the support layer. The support layer is provided with a through hole, and at least a portion of the second connection layer extends into the through hole and is connected to the first connection layer.

11. The battery cell according to claim 10, characterized in that: The second connection layer is provided with an avoidance hole at a position corresponding to the protruding portion.

12. A battery device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 11.

13. An electrical equipment, characterized in that: The electrical equipment comprises the battery device as claimed in claim 12, wherein the battery device is used to provide electrical energy.

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