Battery cell, battery pack, and electric device

Abstract

The application discloses a battery monomer, a battery pack and a power utilization device. The battery monomer comprises an electrode assembly, a bottom supporting plate and a shell. The shell has a containing cavity, and the shell has a first wall. The electrode assembly is arranged in the containing cavity, and the electrode assembly comprises a pole core and an insulating piece. The insulating piece is wrapped on the outer circumferential surface of the pole core. The bottom supporting plate is arranged between the insulating piece and the first wall. The bottom supporting plate has a first side facing the insulating piece. The first side is provided with a hot melting part and a concave-convex structure. The hot melting part is connected with the insulating piece, and the concave-convex structure is at least partially in contact with the insulating piece. In this way, the connection strength between the bottom supporting plate and the insulating piece is improved by connecting the hot melting part with the insulating piece, so that the connection reliability of the bottom supporting plate and the electrode assembly is improved. Meanwhile, the concave-convex structure is arranged on the bottom supporting plate. When the battery monomer is impacted by external force, the stress deformation of the concave-convex structure can effectively buffer and absorb energy, so that the impact force is prevented from being directly transmitted to the pole core, and the damage risk of the pole core is reduced.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery cell, a battery pack, and an electrical device. Background Technology

[0002] Batteries are typically installed at the bottom of vehicles, directly exposed to complex and changing road conditions, making them susceptible to impacts from flying stones, protrusions, or other foreign objects. Such bottom impacts can cause deformation of the battery casing, which in turn can deform the battery cells, and even lead to serious consequences such as electrolyte leakage, short circuits, and thermal runaway, threatening vehicle safety and the safety of passengers' lives and property.

[0003] In existing technologies, a base plate is installed in the battery to insulate and protect the internal electrode assembly from the battery casing, thereby ensuring the safety of the battery's internal components. However, existing base plates cannot simultaneously guarantee resistance to deformation and the connection strength between the base plate and the electrode assembly. Utility Model Content

[0004] This application aims to provide a battery cell, battery pack, and electrical device that can solve the problem of unreliable connection between existing base plates and electrode assemblies.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a battery cell, comprising: an electrode assembly, a base plate, and a housing; the housing has a receiving cavity and a first wall; the electrode assembly is disposed in the receiving cavity, the electrode assembly including an electrode core and an insulating member, the insulating member covering the outer peripheral surface of the electrode core; the base plate is disposed between the insulating member and the first wall; the base plate has a first side facing the insulating member, the first side having a heat-fused portion and a concave-convex structure; the heat-fused portion is connected to the insulating member, and the concave-convex structure at least partially contacts the insulating member.

[0007] Optionally, the heat-fused part is heat-fused to the insulating component.

[0008] Optionally, the battery cell further includes an adhesive component; the adhesive component is disposed between the heat-melting part and the insulating component, with one side of the adhesive component bonded to the heat-melting part and the other side bonded to the insulating component.

[0009] Optionally, the concave-convex structure includes a plurality of first protrusions disposed on the first side; the battery cell has a first direction and a third direction perpendicular to each other, and along the third direction, the first protrusions protrude toward the insulating member; the plurality of first protrusions are arranged at intervals along the first direction, and a groove is formed between adjacent first protrusions; the first protrusions abut against the insulating member; the bottom plate also has a second side away from the insulating member, and the second side has a second protrusion at a position corresponding to the groove, the groove extends recessed toward the second protrusion, and the second protrusion protrudes toward the first wall and abuts against the first wall.

[0010] Optionally, the surface of the first protrusion that abuts against the insulating member is the first abutment surface, and the surface of the second protrusion that abuts against the first wall is the second abutment surface. The width of the first abutment surface along the first direction is greater than the width of the second abutment surface along the first direction.

[0011] Optionally, the length direction of the battery cell is the second direction; at least two hot-melt sections are provided, and the at least two hot-melt sections are spaced apart along the second direction.

[0012] Optionally, at least two of the hot-melt portions are spaced apart along the second direction to form a hot-melt group, and the battery cell also has a first direction perpendicular to the second direction. At least two hot-melt groups are provided, and the at least two hot-melt groups are spaced apart along the first direction.

[0013] Optionally, the battery cell further includes an explosion-proof valve; the explosion-proof valve is disposed on the first wall; the bottom support plate is provided with a pressure relief part at a position corresponding to the explosion-proof valve, the pressure relief part is disposed between at least two of the heat-fused parts; the height direction of the battery cell is a third direction, the pressure relief part is configured as a pressure relief hole, the pressure relief hole penetrates the bottom support plate along the third direction; or, the pressure relief part is configured as a pressure relief groove.

[0014] Optionally, the base plate further includes a bent portion and a main body portion; the bent portion and the main body portion are both disposed between the insulating member and the first wall, the main body portion has a first side facing the insulating member and the hot-melt portion and the concave-convex structure disposed on the first side, the battery cell has a first direction, the bent portion is disposed on both sides of the main body portion along the first direction, the bent portion is connected to the main body portion, and the bent portion bends towards the first wall.

[0015] Secondly, embodiments of this application propose a battery pack comprising the battery cells described in the above embodiments.

[0016] Thirdly, embodiments of this application propose an electrical device, including the battery cell described in the above embodiments, or the battery pack described in the above embodiments.

[0017] In this embodiment, the electrode core is placed in the receiving cavity, and the insulating component covers the outer peripheral surface of the electrode core. A bottom support plate is positioned between the insulating component and the first wall, with a heat-fused portion on the first side of the bottom support plate connected to the insulating component, and a concave-convex structure in contact with the insulating component. This heat-fused connection enhances the connection strength between the bottom support plate and the insulating component, thereby improving the reliability of the connection between the bottom support plate and the electrode assembly. Simultaneously, the concave-convex structure on the bottom support plate effectively buffers and absorbs energy when the battery cell is subjected to external impact, preventing the impact force from being directly transmitted to the electrode core, thus reducing the risk of damage to the electrode core. In other words, the bottom support plate of this application balances deformation resistance and connection strength with the electrode assembly.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is an exploded view of a battery cell according to an embodiment of this application;

[0021] Figure 2 This is a top view of a first type of base plate according to an embodiment of this application;

[0022] Figure 3 This is a cross-sectional view of a first type of base plate according to an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the first type of base plate structure according to an embodiment of this application;

[0024] Figure 5 This is a schematic diagram of a second type of base plate according to an embodiment of this application;

[0025] Figure 6 This is a schematic diagram of a third type of base plate according to an embodiment of this application;

[0026] Figure 7 This is a schematic diagram of a first type of housing according to an embodiment of this application;

[0027] Figure 8 This is a front view of a first type of housing according to an embodiment of this application;

[0028] Figure 9This is a side view of a first type of housing according to an embodiment of this application;

[0029] Figure 10 This is a schematic diagram of a second type of housing according to an embodiment of this application.

[0030] Figure label:

[0031] 1. Electrode assembly; 11. Electrode core; 12. Insulating component;

[0032] 2. Base plate; 21. Hot-melt section; 22. Concave-convex structure; 221. First protrusion; 221a. First abutment surface; 222. Groove; 223. Second protrusion; 223a. Second abutment surface; 23. Arc segment; 24. Pressure relief section; 25. First side; 26. Second side; 27. Hot-melt assembly; 28. Bending section; 29. ​​Main body section;

[0033] 3. Shell; 31. Receiving cavity; 32. Cavity opening; 33. First wall; 4. Top cover; 5. Explosion-proof valve; Y, first direction; X, second direction; Z, third direction. Detailed Implementation

[0034] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0036] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] The battery cell, battery pack, and electrical equipment provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0039] like Figures 1 to 3 As shown in the embodiment of this application, a battery cell is proposed, including: an electrode assembly 1, a bottom plate 2, and a housing 3; the housing 3 has a receiving cavity 31 and a first wall 33; the electrode assembly 1 is disposed in the receiving cavity 31, the electrode assembly 1 includes an electrode core 11 and an insulating member 12, the insulating member 12 covers the outer peripheral surface of the electrode core 11; the bottom plate 2 is disposed between the insulating member 12 and the first wall 33; the bottom plate 2 has a first side 25 facing the insulating member 12, the first side 25 is provided with a heat-fusion part 21 and a concave-convex structure 22; the heat-fusion part 21 is connected to the insulating member 12, and the concave-convex structure 22 is at least partially in contact with the insulating member 12.

[0040] In this embodiment, the electrode core 11 is disposed in the receiving cavity 31, and the insulating member 12 covers the outer peripheral surface of the electrode core 11. The bottom support plate 2 is disposed between the insulating member 12 and the first wall 33. The heat-fusion part 21 disposed on the first side 25 of the bottom support plate 2 is connected to the insulating member 12, and the concave-convex structure 22 is in contact with the insulating member 12. In this way, the connection strength between the bottom support plate 2 and the insulating member 12 can be improved through the connection of the heat-fusion part 21 to the insulating member 12, thereby improving the connection reliability between the bottom support plate 2 and the electrode assembly 1. Furthermore, by providing the concave-convex structure 22 on the bottom support plate 2, when the battery cell is subjected to external impact, the stress deformation of the concave-convex structure 22 can effectively buffer and absorb energy, preventing the impact force from being directly transmitted to the electrode core 11, thereby reducing the risk of damage to the electrode core 11.

[0041] In some embodiments, such as Figure 1 , Figures 7 to 9 As shown, the receiving cavity 31 has an opening 32, through which the electrode assembly 1 enters the receiving cavity 31; the battery cell also includes a top cover 4, which is placed on the opening 32 to seal the receiving cavity 31.

[0042] It is understood that the first wall 33 of the housing 3 can be a side wall of the housing 3 surrounding the electrode assembly 1, or it can be the bottom wall of the housing 3, i.e., the bottom of the receiving cavity 31. This embodiment of the application does not impose any limitations on this. In some preferred embodiments, the first wall 33 is the bottom wall of the housing 3.

[0043] In some embodiments, the heat-melting part 21 can be a heat-melting surface of the base plate 2 facing the insulating member 12. The base plate 2 is connected to the insulating member 12 through the heat-melting surface, thereby increasing the connection area between the heat-melting part 21 and the insulating member 12 in the base plate 2 with the concave-convex structure 22. Specifically, there can be multiple heat-melting parts 21, and the multiple heat-melting parts 21 are arranged in an array.

[0044] In some embodiments, the base plate 2 can be formed by injection molding or stamping bending. Optionally, such as Figure 1 and Figure 2 As shown, the heat-fused part 21 is heat-fused to the insulating part 12.

[0045] In this embodiment, the heat-fusion section 21 is heat-fused to the insulating member 12. This allows the base plate 2 and the insulating member 12 to be connected into a unified whole using the properties of heat fusion, resulting in high connection strength and improved reliability and stability. Furthermore, the connection between the insulating member 12 and the heat-fusion section 21 has continuous and uniform structural strength, efficiently transferring and dispersing the impact force from the first wall 33 of the housing 3 to the insulating member 12 of the entire electrode assembly 1, thus avoiding stress concentration.

[0046] It should be noted that hot melt is a joining process. Its core principle is to use precisely controlled heat and pressure to locally melt and fuse two thermoplastic structural parts at the contact interface, and then solidify them after cooling, thereby forming a strong and integrated connection interface.

[0047] In some embodiments, the base plate 2 is made of thermoplastic plastics such as polypropylene, nylon, and polyphenylene sulfide; the insulating component 12 is made of thermoplastic plastics such as polypropylene or polyethylene. It is only necessary to ensure that the materials of the base plate 2 and the insulating component 12 are compatible or the same.

[0048] For example, both the insulating component 12 and the base plate 2 are made of polypropylene material. The hot-melt connection process of the insulating component 12 and the base plate 2 is as follows: pressure and heat are applied to the assembled base plate 2 by automated equipment, so that the hot-melt part 21 of the base plate 2 and the surface of the insulating component 12 in contact with it are rapidly heated to a molten state; under continuous pressure, the molten plastic molecules of the two diffuse and fuse with each other; then, after a pressure holding and cooling stage, the molten interface is re-solidified and crystallized, and finally an integrated structure is formed, thereby achieving a high-strength and high-reliability connection between the base plate 2 and the insulating component 12.

[0049] Optionally, the battery cell also includes an adhesive (not shown in the figure); the adhesive is disposed between the heat-melting part 21 and the insulating part 12, with one side of the adhesive bonded to the heat-melting part 21 and the other side bonded to the insulating part 12.

[0050] In this embodiment, an adhesive is provided between the heat-fused part 21 and the insulating member 12, and the heat-fused part 21 and the insulating member 12 are bonded together by the adhesive. This makes the connection of the heat-fused part 21 and the insulating member 12 simple and convenient.

[0051] In some embodiments, the adhesive can be a hot melt adhesive film, a reactive adhesive, a pressure-sensitive adhesive, or a structural hot melt adhesive, and the embodiments of this application do not limit this.

[0052] Optionally, such as Figure 2 and Figure 3 As shown, the concave-convex structure 22 includes a plurality of first protrusions 221 disposed on the first side 25; the battery cell has a first direction Y and a third direction Z that are perpendicular to each other, and along the third direction Z, the first protrusions 221 protrude toward the insulating member 12; the plurality of first protrusions 221 are arranged at intervals along the first direction Y, and a groove 222 is formed between adjacent first protrusions 221; the first protrusions 221 and the insulating member 12 abut against each other; the bottom plate 2 also has a second side 26 away from the insulating member 12, and the second side 26 is provided with a second protrusion 223 at a position corresponding to the groove 222, the groove 222 extends recessed toward the second protrusion 223, and the second protrusion 223 protrudes toward the first wall 33 and abuts against the first wall 33.

[0053] It should be noted that the width direction of the battery cell is the first direction Y, the length direction of the battery cell is the second direction X, and the height direction of the battery cell is the third direction Z. The first direction Y, the second direction X, and the third direction Z are all perpendicular to each other.

[0054] In this embodiment, a plurality of first protrusions 221 are provided on the first side 25, and the plurality of first protrusions 221 are arranged at intervals along the first direction Y and abut against the insulating member 12; a second protrusion 223 is provided on the second side 26 at a position corresponding to the groove 222, and the second protrusion 223 protrudes toward the first wall 33 and abuts against the first wall 33. In this way, when the battery cell is subjected to an external force impact, the bending characteristics of the first protrusions and the second protrusions 223 can absorb energy and disperse the external force, thereby avoiding stress concentration.

[0055] In some embodiments, such as Figure 3 As shown, an arc segment 23 is provided between the first protrusion 221 and the groove 222. The arc segment 23 has an arc surface to prevent the sharp corners from piercing the insulating component 12 caused by the direct connection between the first protrusion 221 and the groove 222.

[0056] Optionally, such as Figure 3 As shown, the surface of the first protrusion 221 that abuts against the insulating member 12 is the first abutting surface 221a, and the surface of the second protrusion 223 that abuts against the first wall 33 is the second abutting surface 223a. The width of the first abutting surface 221a along the first direction Y is greater than the width of the second abutting surface 223a along the first direction Y.

[0057] In this embodiment, the width of the first contact surface 221a along the first direction Y is set to be greater than the width of the second contact surface 223a along the first direction Y. This creates a force transmission structure that is wider at the top and narrower at the bottom. On the one hand, the wider first contact surface 221a efficiently disperses the impact force from the bottom to a larger area of ​​the insulating member 12, reducing the local pressure on the electrode core 11; on the other hand, the smaller second contact surface 223a increases the local contact pressure and allows for micro-deformation to absorb the initial impact energy, thus achieving a smooth transition of impact energy from "point buffering" to "area dispersion" overall.

[0058] Optionally, such as Figure 2 As shown, the length direction of the battery cell is the second direction X; at least two hot-melt parts 21 are provided, and at least two hot-melt parts 21 are spaced apart along the second direction X.

[0059] In this embodiment, at least two heat-fusion portions 21 are provided, and these at least two heat-fusion portions 21 are spaced apart along the second direction X. In this way, by providing multiple heat-fusion portions 21, the connection strength between the base plate 2 and the insulating member 12 is distributed at different positions along the second direction X, effectively avoiding stress concentration and improving the overall connection stability and anti-warping ability of the base plate 2 and the insulating member 12 in the second direction X.

[0060] Optionally, such as Figure 2 As shown, at least two heat-fused sections 21 are arranged at intervals along the second direction X to form heat-fused groups 27. The battery cell also has a first direction Y perpendicular to the second direction X. At least two heat-fused groups 27 are provided, and at least two heat-fused groups 27 are arranged at intervals along the first direction Y.

[0061] In this embodiment, at least two heat-fusion assemblies 27 are provided, and the at least two heat-fusion assemblies 27 are spaced apart along the first direction Y. In this way, the connection strength between the base plate 2 and the insulating member 12 is distributed at different positions along the first direction Y, which effectively avoids stress concentration and improves the overall connection stability between the base plate 2 and the insulating member 12 in the first direction Y.

[0062] In some embodiments, taking a 38mm*195mm base plate 2 as an example, four heat-fusion parts 21 are provided. Each heat-fusion part 21 has a length of 30mm, a width of 10mm, and a thickness of 0.2mm, thereby meeting the connection strength requirements between the heat-fusion part 21 and the insulating member 12.

[0063] Optionally, such as Figures 5 to 10 As shown, the battery cell also includes an explosion-proof valve 5; the explosion-proof valve 5 is located on the first wall 33; the bottom support plate 2 has a pressure relief section 24 at a position corresponding to the explosion-proof valve 5, and the pressure relief section 24 is located between at least two heat-sealing sections 21; the height direction of the battery cell is the third direction Z, and the pressure relief section 24 is configured as follows: Figure 6 The pressure relief hole shown penetrates the bottom support plate 2 along the third direction Z; or, the pressure relief part 24 is configured as follows: Figure 5 The pressure relief groove shown.

[0064] In this embodiment, the explosion-proof valve 5 is disposed on the first wall 33; the bottom support plate 2 has a pressure relief part 24 at a position corresponding to the explosion-proof valve 5, and the pressure relief part 24 is disposed between at least two heat-fused parts 21; and the pressure relief part 24 is configured as a pressure relief hole or pressure relief groove. In this way, gas can pass through the pressure relief part 24 and directly impact the explosion-proof valve 5, thereby shortening the pressure relief response time and ensuring the timely opening of the explosion-proof valve 5. In addition, the pressure relief part 24 is disposed between the heat-fused parts 21, avoiding the heat-fused parts 21 from blocking the pressure relief path, and while maintaining the connection strength between the bottom support plate 2 and the insulating member 12, it can also relieve pressure in a timely manner.

[0065] Optionally, Figure 3, Figure 4 and Figure 8 As shown, the base plate 2 also includes a bending portion 28 and a main body portion 29; both the bending portion 28 and the main body portion 29 are disposed between the insulating member 12 and the first wall 33. The main body portion 29 has a first side 25 facing the insulating member 12 and a heat-melting portion 21 and a concave-convex structure 22 disposed on the first side 25. The battery cell has a first direction Y, which is the width direction of the battery cell. The bending portion 28 is disposed on both sides of the main body portion 29 along the first direction Y. The bending portion 28 is connected to the main body portion 29 and bends towards the first wall 33.

[0066] In this embodiment, the bending portion 28 and the main body portion 29 are both disposed between the insulating member 12 and the first wall 33. The bending portion 28 is disposed on both sides of the main body portion 29 along the first direction Y and connected to the main body portion 29, with the bending portion 28 bending towards the first wall 33. This improves the rigidity and bending resistance of the base plate 2 in the first direction Y by means of the bending portion 28, suppressing possible curling or deformation of the edge of the base plate 2 when subjected to impact, and improving the overall structural integrity. In addition, the bending portion 28 forms a partial contact or a small gap fit with the first wall 33 of the housing 3, providing a lateral support point for the base plate 2, preventing the base plate 2 from shifting laterally within the housing 3, and ensuring the stability of the base plate 2.

[0067] Optionally, embodiments of this application propose a battery pack including the battery cells described in the above embodiments.

[0068] In this embodiment, the electrode core 11 is disposed in the receiving cavity 31, and the insulating member 12 covers the outer peripheral surface of the electrode core 11. The bottom support plate 2 is disposed between the insulating member 12 and the first wall 33. The heat-fused portion 21 of the first side 25 of the bottom support plate 2 is connected to the insulating member 12, and the concave-convex structure 22 contacts the insulating member 12. In this way, the connection strength between the bottom support plate 2 and the insulating member 12 can be improved through the connection of the heat-fused portion 21 to the insulating member 12, thereby improving the connection reliability between the bottom support plate 2 and the electrode assembly 1. Furthermore, by providing the concave-convex structure 22 on the bottom support plate 2, when the battery cell is subjected to external impact, the stress deformation of the concave-convex structure 22 can effectively buffer and absorb energy, preventing the impact force from being directly transmitted to the electrode core 11, thereby reducing the risk of damage to the electrode core 11.

[0069] Optionally, embodiments of this application propose an electrical device including a single battery cell or a battery pack as described in the above embodiments.

[0070] In this embodiment, the electrode core 11 is disposed in the receiving cavity 31, and the insulating member 12 covers the outer peripheral surface of the electrode core 11. The bottom support plate 2 is disposed between the insulating member 12 and the first wall 33. The heat-fused portion 21 of the first side 25 of the bottom support plate 2 is connected to the insulating member 12, and the concave-convex structure 22 contacts the insulating member 12. In this way, the connection strength between the bottom support plate 2 and the insulating member 12 can be improved through the connection of the heat-fused portion 21 to the insulating member 12, thereby improving the connection reliability between the bottom support plate 2 and the electrode assembly 1. Furthermore, by providing the concave-convex structure 22 on the bottom support plate 2, when the battery cell is subjected to external impact, the stress deformation of the concave-convex structure 22 can effectively buffer and absorb energy, preventing the impact force from being directly transmitted to the electrode core 11, thereby reducing the risk of damage to the electrode core 11.

[0071] In some embodiments, electrical devices may include laptops, pen-based computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, stereo headphones, video recorders, LCD TVs, portable cleaners, portable CD players, mini CDs, transceivers, electronic notebooks, calculators, memory cards, portable recorders, radios, backup power supplies, motors, automobiles, motorcycles, electric bicycles, bicycles, ships, spacecraft, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries, and lithium-ion capacitors, etc.

[0072] Specifically, the vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.

[0073] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0074] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, include: Electrode assembly (1), base plate (2), and housing (3); The housing (3) has a receiving cavity (31) and a first wall (33); the electrode assembly (1) is disposed in the receiving cavity (31), the electrode assembly (1) includes an electrode core (11) and an insulating member (12), the insulating member (12) covers the outer peripheral surface of the electrode core (11); the bottom support plate (2) is disposed between the insulating member (12) and the first wall (33); The base plate (2) has a first side (25) facing the insulating member (12), and the first side (25) is provided with a heat-melting part (21) and a concave-convex structure (22); the heat-melting part (21) is connected to the insulating member (12), and the concave-convex structure (22) is at least partially in contact with the insulating member (12).

2. The battery cell according to claim 1, characterized in that, The heat-fused part (21) is heat-fused to the insulating part (12); Alternatively, the battery cell may also include an adhesive component; the adhesive component is disposed between the heat-melting part (21) and the insulating part (12), with one side of the adhesive component bonded to the heat-melting part (21) and the other side bonded to the insulating part (12).

3. The battery cell according to claim 1, characterized in that, The concave-convex structure (22) includes a plurality of first protrusions (221) disposed on the first side (25); The battery cell has a first direction (Y) and a third direction (Z) that are perpendicular to each other. Along the third direction (Z), the first protrusion (221) protrudes toward the insulating member (12). Multiple first protrusions (221) are arranged at intervals along the first direction (Y), and grooves (222) are formed between adjacent first protrusions (221); the first protrusions (221) and the insulating member (12) abut against each other; The bottom plate (2) also has a second side (26) away from the insulating member (12). The second side (26) has a second protrusion (223) at a position corresponding to the groove (222). The groove (222) extends recessed into the second protrusion (223), and the second protrusion (223) protrudes toward the first wall (33) and abuts against the first wall (33).

4. The battery cell according to claim 3, characterized in that, The surface of the first protrusion (221) that abuts against the insulating member (12) is the first abutting surface (221a), and the surface of the second protrusion (223) that abuts against the first wall (33) is the second abutting surface (223a). The width of the first abutting surface (221a) along the first direction (Y) is greater than the width of the second abutting surface (223a) along the first direction (Y).

5. The battery cell according to any one of claims 1-4, characterized in that, The length direction of the battery cell is the second direction (X); at least two hot-melt parts (21) are provided, and at least two hot-melt parts (21) are spaced apart along the second direction (X).

6. The battery cell according to claim 5, characterized in that, At least two of the heat-fused portions (21) are spaced apart along the second direction (X) to form a heat-fused group (27). The battery cell also has a first direction (Y) perpendicular to the second direction (X). At least two heat-fused groups (27) are provided, and the at least two heat-fused groups (27) are spaced apart along the first direction (Y).

7. The battery cell according to claim 5, characterized in that, The battery cell also includes an explosion-proof valve (5); The explosion-proof valve (5) is located on the first wall (33); the bottom support plate (2) is provided with a pressure relief part (24) at a position corresponding to the explosion-proof valve (5), and the pressure relief part (24) is located between at least two of the heat-melting parts (21); The height direction of the battery cell is a third direction (Z), and the pressure relief part (24) is configured as a pressure relief hole, which penetrates the bottom support plate (2) along the third direction (Z); or, the pressure relief part (24) is configured as a pressure relief groove.

8. The battery cell according to claim 1, characterized in that, The base plate (2) also includes a bent portion (28) and a main body portion (29); The bending portion (28) and the main body portion (29) are both disposed between the insulating member (12) and the first wall (33). The main body portion (29) has a first side (25) facing the insulating member (12) and a hot-melt portion (21) and a concave-convex structure (22) disposed on the first side (25). The battery cell has a first direction (Y). The bending portion (28) is disposed on both sides of the main body portion (29) along the first direction (Y). The bending portion (28) is connected to the main body portion (29). The bending portion (28) bends toward the first wall (33).

9. A battery pack, characterized in that, Includes the battery cell described in any one of claims 1-8.

10. An electrical appliance, characterized in that, Includes the battery cell as described in any one of claims 1-8; or the battery pack as described in claim 9.

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