Battery cover plate and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cover plate and a battery. The battery cover plate is used for being matched with a shell part of a battery shell, and comprises a main body part; a first boss and a second boss are arranged on one side of the main body part, the edge of the first boss is located on the edge of the main body part, and the second boss is located in the middle of the main body part; the first boss is used for being connected with the shell part in a matched mode. The second boss is configured to abut against a battery cell assembly in the battery shell so as to limit the battery cell assembly. The battery cover plate can abut against the battery cell assembly in the battery shell through the second boss, and the battery cell assembly in the battery shell can be limited. When the battery is vibrated, the second boss can effectively limit the middle part of the battery cell assembly, and the middle part of the naked battery cell of the battery cell assembly does not have an interlayer dislocation phenomenon, so that the safety of the battery is ensured.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cover and a battery. Background Art

[0002] Batteries are a widely used energy device that can reliably supply power to electrical devices.

[0003] Currently, batteries include a battery housing and a cell assembly disposed within the housing. The battery housing comprises a housing portion and a battery cover disposed over the housing portion. The battery cover seals the housing portion to ensure the sealing of the battery housing. The edge of the battery cover facing the cell assembly is provided with a boss that engages and electrically contacts the cell assembly, retaining the cell assembly in position within the battery housing while also achieving electrical connection between the cell assembly and the battery cover.

[0004] However, when the battery is subjected to vibration, the middle part of the bare cell (JR) of the battery assembly is prone to "core pulling", that is, the interlayer dislocation occurs in the middle part of the bare cell, causing a short circuit inside the battery. Utility Model Content

[0005] Based on this, the present application provides a battery cover and a battery to solve the problem in the related art that when the battery is subjected to vibration, the middle part of the bare battery cell is prone to "core pulling".

[0006] In the first aspect, an embodiment of the present application provides a battery cover for cooperating with the shell portion of a battery shell, comprising: a main body portion; a first boss and a second boss are provided on one side of the main body portion, the edge of the first boss is located at the edge of the main body portion, and the second boss is located in the middle of the main body portion; wherein the first boss is used to cooperate with the shell portion; the second boss is configured to abut against the battery cell assembly in the battery shell to limit the battery cell assembly.

[0007] In the technical solution of the embodiment of the present application, the battery cover is provided with a first boss and a second boss on one side of the main body, the edge of the first boss is located at the edge of the main body, and the second boss is located in the middle of the main body. The battery cover cooperates with the shell portion of the battery shell through the first boss to ensure the sealing of the battery shell. The battery cover can be abutted against the battery cell assembly in the battery shell through the second boss, and can limit the battery cell assembly in the battery shell. When the battery is subjected to vibration, the second boss can effectively limit the middle part of the battery cell assembly, and the middle part of the bare battery cell of the battery cell assembly will not have interlayer dislocation phenomenon, thereby ensuring the safety of the battery.

[0008] In some embodiments, the first boss is arranged around the second boss, and both the first boss and the second boss are configured to abut against the battery cell assembly.

[0009] In some embodiments, a height of the first boss is different from a height of the second boss.

[0010] In some embodiments, a height difference H1 is formed between an end surface of the first boss facing away from the main body and an end surface of the second boss facing away from the main body, and H1 satisfies:

[0011] 0.05mm≤H1≤1mm.

[0012] In some embodiments, a first groove is provided at one end of the first boss facing the battery cell assembly, and the first groove extends from a side of the first boss away from the center of the main body to a side of the first boss facing the center of the main body.

[0013] In some embodiments, a gap is provided between the first boss and the battery cell assembly in a height direction of the housing.

[0014] In some embodiments, the first boss is arranged around the second boss, and the height of the second boss is greater than that of the first boss.

[0015] In some embodiments, the second boss is disposed on a side of the first boss facing away from the main body.

[0016] In some embodiments, a second groove is provided at one end of the second boss facing the battery cell assembly, and the second groove extends from a side of the second boss away from the center of the main body to a side of the second boss facing the center of the main body.

[0017] In some embodiments, there are multiple second bosses, which are distributed in a ring around the center of the main body, with a gap between two adjacent second bosses; or,

[0018] The number of the second boss is one, and the second boss is an arc-shaped structure. The second boss is distributed around the center of the main body, and there is a gap between the two ends of the second boss along the circumference of the main body.

[0019] In some embodiments, the second boss is arranged around the center of the main body, the main body is provided with a weak portion, the mechanical strength of the weak portion is less than the mechanical strength of the rest of the main body, and the weak portion is located on the side of the second boss away from the first boss.

[0020] In the second aspect, an embodiment of the present application provides a battery, including a battery shell and a battery cell assembly, the battery shell includes a shell portion and the above-mentioned battery cover plate, the battery cover plate is arranged on the shell portion, the first boss and the second boss of the battery cover plate respectively extend into the shell portion, and the first boss of the battery cover plate is cooperatively connected with the shell portion; the battery cell assembly is arranged inside the battery shell, and the middle part of the end face of the battery cell assembly is abutted against the second boss of the battery cover plate.

[0021] 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

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 A schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0024] Figure 2 for Figure 1 an exploded view of the battery shown;

[0025] Figure 3 A schematic structural diagram of the first battery cover provided in an embodiment of the present application;

[0026] Figure 4 for Figure 3 A cross-sectional view of the battery cover shown;

[0027] Figure 5 A schematic structural diagram of a second battery cover provided in an embodiment of the present application;

[0028] Figure 6 A schematic cross-sectional view of a third battery cover provided in an embodiment of the present application;

[0029] Figure 7 A schematic structural diagram of a fourth battery cover provided in an embodiment of the present application;

[0030] Figure 8 This is a schematic structural diagram of the fifth battery cover provided in an embodiment of the present application.

[0031] Description of reference numerals:

[0032] 100-battery cover;

[0033] 110 - main body; 120 - first boss; 121 - first groove; 130 - second boss; 131 - second groove; 140 - weak part;

[0034] 200-housing portion;

[0035] 300-cell assembly;

[0036] 310-bare cell; 320-collector plate. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0039] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0040] The terms "first", "second" and "third" (if any) in the description and claims of this application and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0041] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or display that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or display.

[0042] Currently, the market landscape shows that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing, placing higher demands on battery safety performance.

[0043] The inventors have noticed that in the related art, the shell portion is sealed by a battery cover to ensure the sealing of the battery shell. A boss is provided on the edge of the battery cover facing the battery cell assembly. The boss abuts against the battery cell assembly and is in conductive contact with the battery cell assembly. The boss limits the battery cell assembly in the battery shell and realizes the electrical connection between the battery cell assembly and the battery cover. However, the boss of the battery cover can only support the edge of the battery cell assembly, and the center of the battery cell assembly has no effective support. When the battery is subjected to vibration, the middle part of the bare cell of the battery cell assembly is prone to "core pulling", that is, the middle part of the bare cell is misaligned between layers, resulting in a short circuit inside the battery.

[0044] The bare cell of the battery assembly includes a positive electrode sheet, a separator and a negative electrode sheet. When "core pulling" occurs in the middle of the bare cell, that is, when interlayer dislocation occurs in the middle of the bare cell, the positive electrode sheet and the negative electrode sheet located in the middle of the bare cell are dislocated with each other, and the bare cell will short-circuit, affecting the safety of the battery.

[0045] To address this issue, the applicant discovered that a first and second boss can be provided on the battery cover. The first boss connects the battery cover to the battery housing. The second boss, located in the middle of the battery cover, can be used to position the battery cell assembly within the battery housing, preventing the bare cells in the battery assembly from "pull-out" in the middle.

[0046] The battery provided in the embodiments of the present application can be used as a power source for electrical devices, including but not limited to mobile phones, tablets, laptops, electric toys, electric tools, electric vehicles, electric cars, ships, spacecraft, etc.

[0047] Please refer to Figures 1 to 3 The battery provided in this application includes a battery housing and a battery cell assembly 300. The battery housing includes a housing portion 200 and a battery cover plate 100 of the embodiment described below. The battery cover plate 100 is covered on the housing portion 200, and the first boss 120 and the second boss 130 of the battery cover plate 100 respectively extend into the housing portion 200. The first boss 120 of the battery cover plate 100 is matingly connected to the housing portion 200. The battery cell assembly 300 is arranged inside the battery housing, and the middle part of the end face of the battery cell assembly 300 abuts against the second boss 130 of the battery cover plate 100.

[0048] In this embodiment, the battery can be a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc. The shape of the battery can be square, cylindrical or flat, etc., and is not limited here.

[0049] In one possible implementation, the battery cell assembly 300 may include only a bare battery cell 310 (JR), and the middle portion of the end surface of the bare battery cell 310 facing the battery cover 100 abuts against the second protrusion of the battery cover 100. In another possible implementation, as Figure 2 As shown, the battery cell assembly 300 may include a bare battery cell 310 and a current collecting plate 320 located at the end of the bare battery cell 310 , and the middle of the side of the current collecting plate 320 facing away from the bare battery cell 310 abuts against the second boss of the battery cover 100 .

[0050] The battery cover 100 may be a sheet-like structure whose shape matches the cross-sectional shape of the housing 200. Schematically, the housing 200 has a receiving cavity, in which the battery cell assembly 300 is disposed. After the battery cover 100 is connected to the housing 200, the receiving cavity can be sealed to ensure the sealing of the battery housing.

[0051] Illustratively, after the battery cover plate 100 is placed on the shell portion 200 , the edge of the first boss can be fixed to the side wall of the shell portion 200 by laser welding, thereby reliably fixing the battery cover plate 100 on the shell portion 200 .

[0052] The battery housing provided in this embodiment has a high degree of sealing due to the use of the battery cover 100 described below. Furthermore, the second boss of the battery cover 100 can reliably position the battery cell assembly 300 within the battery housing, preventing the bare battery cells 310 of the battery cell assembly 300 from "pull-out" in the middle.

[0053] Please refer to Figures 2 to 4 The present application also provides a battery cover 100 for mating with the housing portion 200 of a battery housing. The battery cover 100 includes a main body 110, with a first boss 120 and a second boss 130 provided on one side of the main body 110. The edge of the first boss 120 is located at the edge of the main body 110, and the second boss 130 is located in the middle of the main body 110. The first boss 120 is used to mate with the housing portion 200. The second boss 130 is configured to abut against the battery cell assembly 300 in the battery housing to limit the battery cell assembly 300.

[0054] The battery cover 100 can be made of a metal material, the main body 110 of the battery cover 100 is a sheet-like structure, and the first boss 120 and the second boss 130 can be provided on the main body 110 by an integrated molding process. When the battery cover 100 is covered on the housing 200, the first boss 120 and the second boss 130 respectively extend into the housing 200. For example, the first boss 120 and the second boss 130 can be formed on the main body 110 by stamping.

[0055] Among them, the edge of the first boss 120 surrounds the center of the main body 110, and the edge of the first boss 120 can be tightly attached to the side wall of the shell part 200. After the first boss 120 is tightly attached to the shell part 200, the first boss 120 can be fixed to the side wall of the shell part 200 by laser welding.

[0056] The present embodiment does not limit the shape and size of the second boss 130, and those skilled in the art can limit it according to actual needs. The end face of the second boss 130 away from the main body 110 is parallel to the main body 110. When the end face of the second boss 130 abuts against the battery cell assembly 300, the contact area between the second boss 130 and the battery cell assembly 300 can be guaranteed, and the second boss 130 can be reliably limited to the middle of the battery cell assembly 300. It can be understood that after the second boss 130 abuts against the battery cell assembly 300, an electrical connection between the battery cover 100 and the battery cell assembly 300 can be achieved. After the second boss 130 abuts against the battery cell assembly 300, the second boss 130 and the battery cell assembly 300 can be fixed by laser welding.

[0057] The battery cover 100 provided in this embodiment cooperates with the battery housing portion 200 via the first boss 120 to ensure the sealing of the battery housing. The battery cover 100, via the second boss 130, can abut against the battery cell assembly 300 within the battery housing, thereby limiting the position of the battery cell assembly 300 within the battery housing. When the battery is subjected to vibration, the second boss 130 can effectively limit the center of the battery cell assembly 300, preventing interlayer misalignment in the center of the bare cells 310 of the battery cell assembly 300, thereby ensuring battery safety.

[0058] In one embodiment, Figure 2-Figure 4 As shown, the first boss 120 is arranged around the second boss 130 , and both the first boss 120 and the second boss 130 are configured to abut against the battery cell assembly 300 .

[0059] Schematically, the first boss 120 is formed as an annular structure, the shape of which matches the cross-sectional shape of the shell portion 200, and the second boss 130 is located inside the annular structure. After the first boss 120 extends into the shell portion 200, the outer periphery of the first boss 120 is tightly attached to the side wall of the shell portion 200.

[0060] like Figure 3 As shown, there is a gap between the first boss 120 and the second boss 130 in the direction from the edge to the center of the main body 110. The end surface of the first boss 120 facing away from the main body 110 is parallel to the main body 110. When the battery cover 100 is placed on the shell 200, the first boss 120 abuts against the edge of the battery cell assembly 300 facing the battery cover 100, and the second boss 130 abuts against the middle of the battery cell assembly 300 facing the battery cover 100.

[0061] Through the above arrangement, the first boss 120 and the second boss 130 of the battery cover 100 respectively abut against the battery cell assembly 300, so that "core pulling" will not occur at the edge and the middle of the battery cell assembly 300, further improving the safety of the battery.

[0062] In a specific embodiment, Figure 3 and Figure 4 As shown, the height of the first boss 120 is different from the height of the second boss 130 .

[0063] Optionally, the height of the first boss 120 is greater than the height of the second boss 130 , or the height of the second boss 130 is greater than the height of the first boss 120 , which is not a sole limitation herein.

[0064] It's worth noting that during battery assembly, the cell assembly 300 isn't fully inserted into the housing 200 after being placed. As the battery cover 100 is placed on the housing 200, it pushes the cell assembly 300 toward the interior of the housing 200. After the battery cover 100 is placed on the housing 200, the first and second bosses 120, 130 respectively abut against the cell assembly 300. This arrangement ensures that the bosses of the battery cover 100 reliably abut against the cell assembly 300.

[0065] In this embodiment, when the battery cover 100 pushes the battery cell assembly 300, only the first boss 120 or the second boss 130 contacts the end face of the battery cell assembly 300. This prevents excessive contact area between the battery cover 100 and the battery cell assembly 300, ensures the pressure applied by the battery cover 100 to the battery cell assembly 300, and further ensures that the battery cell assembly 300 is smoothly inserted into the shell. After the battery cover 100 pushes the battery cell assembly 300 into position, the first boss 120 and the second boss 130 respectively abut against the battery cell assembly 300, but the pressures applied by the first boss 120 and the second boss 130 on the battery cell assembly 300 are different.

[0066] In a specific embodiment, Figure 3 and Figure 4 As shown, there is a height difference H1 between the end surface of the first boss 120 away from the main body 110 and the end surface of the second boss 130 away from the main body 110 , and H1 satisfies: 0.05 mm≤H1≤1 mm.

[0067] Illustratively, the height difference H1 between the end surface of the first boss 120 away from the main body 110 and the end surface of the second boss 130 away from the main body 110 may be 0.05 mm, 0.2 mm, 0.5 mm, 0.8 mm, or 1 mm, etc., which is not limited here. When H1 is less than 0.05 mm, when the battery cover 100 just contacts the battery cell assembly 300, only the first boss 120 or the second boss 130 contacts the battery cell assembly 300, but in the process of the battery cover 100 pushing the battery cell assembly 300 to move, both the first boss 120 and the second boss 130 will contact the battery cell assembly 300. The contact area between the battery cover 100 and the battery cell assembly 300 is too large, which affects the insertion of the battery cell assembly 300 into the shell; when H1 is greater than 1 mm, after the battery cover 100 is completely covered on the shell part 200, only one of the first boss 120 and the second boss 130 will be in contact with the battery cell assembly 300, and the middle or edge of the bare battery cell 310 of the battery cell assembly 300 may experience a "core pulling" phenomenon.

[0068] Through the above arrangement, while ensuring that the battery cell assembly 300 is smoothly inserted into the shell, it can also ensure that after the battery cover 100 is completely covered on the shell part 200, the first boss 120 and the second boss 130 respectively abut against the battery cell assembly 300 to reliably avoid the battery cell assembly 300 from "core pulling".

[0069] In one possible implementation, Figure 5 As shown, a first groove 121 is provided on one end of the first boss 120 facing the cell assembly 300 . The first groove 121 extends from the side of the first boss 120 away from the center of the main body 110 to the side of the first boss 120 facing the center of the main body 110 .

[0070] In the related art, when the boss on the edge of the battery cover 100 abuts against the battery cell assembly 300, it will make it difficult to introduce exhaust into the battery. The gas between the battery cell assembly 300 and the side wall of the shell part 200 is difficult to flow between the battery cover 100 and the battery cell assembly 300, and the battery is prone to explosion when thermal runaway occurs.

[0071] In the battery cover 100 provided in this embodiment, the first groove 121 on the first boss 120 can serve as a first channel for the flow of gas and electrolyte. Exemplarily, the first channel formed by the first groove 121 can extend in a direction parallel to the radial direction of the main body 110. The first groove 121 can be provided on the first boss 120 by an integrated molding process. The number of the first grooves 121 is non-limiting and can be provided by those skilled in the art as needed. It is worth mentioning that the depth of the first groove 121 is less than the height of the first boss 120, and the edge of the area of ​​the first boss 120 where the first groove 121 is provided can be connected to the side wall of the shell portion 200, that is, the first groove 121 will not affect the sealing of the battery shell.

[0072] After the battery cover 100 is assembled into a battery, the gas between the cell assembly 300 and the sidewall of the housing 200 can flow into the space between the battery cover 100 and the cell assembly 300 via the first groove 121 on the first boss 120. The first groove 121 allows gas and electrolyte to flow, facilitating electrolyte infiltration and gas and pressure relief, thereby improving battery safety.

[0073] In another possible implementation, there is a gap between the first boss 120 and the battery cell assembly 300 in the height direction of the housing.

[0074] Those skilled in the art can set the specific size of the gap between the first boss 120 and the cell assembly 300 as needed, which is not limited here. It should be noted that the gap between the first boss 120 and the cell assembly 300 can serve as a first channel for gas and electrolyte flow.

[0075] After the battery cover 100 is assembled into a battery, gas between the cell assembly 300 and the sidewall of the housing 200 can flow into the gap between the first boss 120 and the cell assembly 300. The gap between the first boss 120 and the cell assembly 300 allows gas and electrolyte to flow, facilitating electrolyte infiltration and gas and pressure relief, thereby improving battery safety.

[0076] In a specific embodiment, Figure 3 and Figure 4 As shown, the first boss 120 is arranged around the second boss 130 , and the height of the second boss 130 is greater than that of the first boss 120 .

[0077] In other words, the first boss 120 is formed into an annular structure whose shape matches the cross-sectional shape of the housing portion 200, and the second boss 130 is located within the annular structure. The height of the second boss 130 is greater than the height of the first boss 120, ensuring that only the second boss 130 of the battery cover 100 abuts against the battery cell assembly 300. Illustratively, the height of the second boss 130 is different from the height of the first boss 120 by a difference H1, and H1 is such that when the battery cover 100 is completely covered on the housing portion 200, only the second boss 130 of the battery cover 100 abuts against the battery cell assembly 300.

[0078] In another specific embodiment, Figure 6 As shown, the second boss 130 is disposed on a side of the first boss 120 facing away from the main body 110 .

[0079] For example, Figure 6 As shown, the first boss 120 can extend from the edge of the main body 110 to the middle of the main body 110. The second boss 130 is disposed on the first boss 120 so that a gap exists between the first boss 120 and the battery cell assembly 300 after the battery cover is placed on the housing 200. The height of the second boss 130 can be set based on the size of the predetermined gap between the first boss 120 and the battery cell assembly 300, and is not a single limitation herein.

[0080] like Figure 7 As shown, a second groove 131 is provided on one end of the second boss 130 facing the cell assembly 300 . The second groove 131 extends from the side of the second boss 130 away from the center of the main body 110 to the side of the second boss 130 facing the center of the main body 110 .

[0081] Exemplarily, the second groove 131 can be provided on the second boss 130 by an integral molding process, and the depth of the second groove 131 can be less than the height of the second boss 130. The number of second grooves 131 can be one or more, and is not limited here. It can be understood by those skilled in the art that the gas or electrolyte can flow from the side of the second boss 130 toward the edge of the main body 110 to the side of the second boss 130 toward the center of the main body 110 through the second groove 131 on the second boss 130, that is, the second groove 131 on the second boss 130 forms a second channel for the gas or electrolyte to flow through the second boss 130. The second channel formed by the second groove 131 can extend in a direction parallel to the radial direction of the main body 110.

[0082] Through the above arrangement, the second groove 131 can allow gas and electrolyte to flow through the second boss 130, further facilitating electrolyte infiltration and gas and pressure relief, thereby further improving battery safety.

[0083] like Figure 3 、 Figure 5 and Figure 7 As shown, there are multiple second bosses 130 , which are distributed in a ring shape around the center of the main body 110 , with a gap between two adjacent second bosses 130 .

[0084] The plurality of second bosses 130 may be arranged at equal intervals around the center of the main body 110. The number of second bosses 130 may be two, three, or four, etc., and is not limited to a single number. The second bosses 130 may be arc-shaped, with the center of the arc located at the center of the main body 110.

[0085] Those skilled in the art will appreciate that the gap between two adjacent second bosses 130 forms a second channel for gas or electrolyte to flow through the second bosses 130. Through this arrangement, the gap between two adjacent second bosses 130 allows gas and electrolyte to flow through the second bosses 130, further facilitating electrolyte infiltration and gas and pressure relief, thereby further improving battery safety.

[0086] like Figure 8 As shown, there is one second boss 130 , which is an arc-shaped structure and is distributed around the center of the main body 110 , with a gap between two ends of the second boss 130 along the circumference of the main body 110 .

[0087] As will be appreciated, the central angle corresponding to the arc-shaped structure is less than 360°, and the gap between the ends of the second boss 130 forms a second channel for gas or electrolyte to flow through the second boss 130. The width of the gap between the ends of the second boss 130 can be adjusted as needed. The gap between the ends of the second boss 130 allows gas and electrolyte to flow through the second boss 130, further facilitating electrolyte infiltration and gas and pressure relief, thereby further improving battery safety.

[0088] When the first boss 120 is arranged around the second boss 130, as shown in FIG. Figure 3 As shown, the second boss 130 is arranged around the center of the main body 110. The main body 110 is provided with a weak portion 140 (Vent), the mechanical strength of which is lower than the mechanical strength of the rest of the main body 110. The weak portion 140 is located on the side of the second boss 130 facing away from the first boss 120.

[0089] Schematically, there is a gap between the weak portion 140 and the second boss 130 in the direction from the edge to the center of the battery cover 100. For example, the weak portion 140 can be formed by laser scribing on the main body 110, and the thickness of the weak portion 140 is less than the thickness of the rest of the main body 110. Alternatively, the thickness of the main body 110 is consistent, but the material of the weak portion 140 is different from the material of the rest of the main body 110, and the mechanical strength of the material of the weak portion 140 is less than the mechanical strength of the material of the rest of the main body 110. When the internal pressure of the battery increases or the battery experiences thermal runaway, the battery cover 100 can rupture at the weak portion 140 to release the pressure.

[0090] The weak portion 140 is located on the side of the second boss 130 facing away from the first boss 120, that is, the weak portion 140 is located in the area enclosed by the second boss 130. It can be understood that the first boss 120 and the second boss 130 can function as reinforcing ribs. When the second boss 130 abuts against the battery cell assembly 300, the entire area enclosed by the second boss 130 may move away from the battery cell assembly 300. Because the first boss 120 is fixed to the side wall of the housing portion 200, the position of the main body 110 between the first boss 120 and the second boss 130 will be subject to shear force, but the area enclosed by the second boss 130 will not be subject to shear force.

[0091] Disposing the weak portion 140 on the side of the second boss 130 away from the first boss 120 can prevent the force on the second boss 130 from being transferred to the weak portion 140 , that is, prevent the weak portion 140 from being subjected to shear force after the second boss 130 is subjected to force, thereby preventing the weak portion 140 from being damaged.

[0092] 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cover (100), characterized in that: Used to cooperate with the housing portion (200) of a battery housing, comprising: a main body (110); A first boss (120) and a second boss (130) are provided on one side of the main body (110), the edge of the first boss (120) is located at the edge of the main body (110), and the second boss (130) is located in the middle of the main body (110); The first boss (120) is used for being connected in cooperation with the housing portion (200); and the second boss (130) is configured to abut against the battery cell assembly (300) in the battery housing to limit the position of the battery cell assembly (300).

2. The battery cover (100) according to claim 1, characterized in that: The first boss (120) is arranged around the second boss (130), and both the first boss (120) and the second boss (130) are configured to abut against the battery cell assembly (300).

3. The battery cover (100) according to claim 2, characterized in that: The height of the first boss (120) is different from the height of the second boss (130).

4. The battery cover (100) according to claim 3, characterized in that: There is a height difference H1 between the end surface of the first boss (120) facing away from the main body (110) and the end surface of the second boss (130) facing away from the main body (110), The H1 satisfies: 0.05mm≤H1≤1mm.

5. The battery cover (100) according to claim 1, characterized in that: A first groove (121) is provided at one end of the first boss (120) facing the battery cell assembly (300), and the first groove (121) extends from a side of the first boss (120) away from the center of the main body (110) to a side of the first boss (120) facing the center of the main body (110).

6. The battery cover (100) according to claim 1, characterized in that: In the height direction of the housing, there is a gap between the first boss (120) and the battery core assembly (300).

7. The battery cover (100) according to claim 6, characterized in that: The first boss (120) is arranged around the second boss (130), and the height of the second boss (130) is greater than the height of the first boss (120).

8. The battery cover (100) according to claim 6, characterized in that: The second boss (130) is arranged on a side of the first boss (120) facing away from the main body (110).

9. The battery cover (100) according to any one of claims 5 to 8, characterized in that: A second groove (131) is provided at one end of the second boss (130) facing the battery cell assembly (300), and the second groove (131) extends from a side of the second boss (130) away from the center of the main body (110) to a side of the second boss (130) facing the center of the main body (110).

10. The battery cover (100) according to any one of claims 5 to 8, characterized in that: There are multiple second bosses (130), and the multiple second bosses (130) are distributed in a ring shape around the center of the main body (110), with a gap between two adjacent second bosses (130); or, The number of the second boss (130) is one, the second boss (130) is an arc-shaped structure, the second boss (130) is distributed around the center of the main body (110), and there is a gap between the two ends of the second boss (130) along the circumference of the main body (110).

11. The battery cover (100) according to claim 2 or 7, characterized in that: The second boss (130) is arranged around the center of the main body (110), and the main body (110) is provided with a weak portion (140). The mechanical strength of the weak portion (140) is less than the mechanical strength of other positions of the main body (110), and the weak portion (140) is located on the side of the second boss (130) away from the first boss (120).

12. A battery, characterized in that: include: A battery housing, comprising a housing portion (200) and a battery cover plate (100) according to any one of claims 1 to 11, wherein the battery cover plate (100) is covered on the housing portion (200), the first boss (120) and the second boss (130) of the battery cover plate (100) respectively extend into the housing portion (200), and the first boss (120) of the battery cover plate (100) is cooperatively connected to the housing portion (200); and The battery cell assembly (300) is arranged inside the battery housing, and the middle portion of the end surface of the battery cell assembly (300) abuts against the second boss (130) of the battery cover (100).

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