Battery cover plate and battery cell

Abstract

The utility model relates to power battery technical field provides a battery cover plate and battery monomer. The battery cover plate includes the cover plate main part, explosion -proof valve and pole, two convex structures are equipped with on the cover plate main part along the first direction interval, and the convex structure has the contact surface with the structural member contact of battery package, the explosion -proof valve is located between two convex structures in the cover plate main part, and the pole is equipped with on the cover plate main part in every convex structure far away from the explosion -proof valve side along the first direction. The battery cover plate and battery monomer provided by the utility model can utilize the convex structure and the structural member (such as liquid cooling board etc.) contact of battery package, provide the supporting fixed role to the battery monomer, improve the stability of battery monomer in the battery package and improve the overall structural strength of battery package. Meanwhile, the convex structure can be used to separate the explosion -proof valve and the pole, realize thermoelectric separation, avoid the influence of the explosion -proof valve starting to the pole and other electric connecting pieces.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery cover and a battery cell. Background Technology

[0002] A power battery is a rechargeable battery used to power devices such as electric vehicles, primarily by storing and releasing electrical energy to drive an electric motor.

[0003] In existing technologies, the highest point of a single battery cell is typically located on the terminal post of the cover plate. To ensure sufficient safety performance, battery cells are generally protected from excessive external forces within the battery pack, a design that helps prevent damage to the internal structure of the battery. However, this design also results in lower overall strength of the battery pack, potentially affecting its stability and safety under external impacts or pressure. Utility Model Content

[0004] This utility model provides a battery cover and a battery cell to solve the defects in the prior art where the overall strength of the battery pack is low, which may affect its stability and safety when subjected to external impact or pressure.

[0005] This utility model provides a battery cover, including: a cover body, an explosion-proof valve, and a terminal post.

[0006] The cover plate body has two protruding structures spaced apart along a first direction, and the protruding structures have contact surfaces that contact the structural components of the battery pack; the explosion-proof valve is disposed on the cover plate body and is located between the two protruding structures; along the first direction, the cover plate body has the pole post on the side of each protruding structure away from the explosion-proof valve.

[0007] According to the battery cover provided by this utility model, the explosion-proof valve has a gap between its two sides along the first direction and the corresponding protruding structure.

[0008] According to the battery cover provided by this utility model, the spacing is 1mm to 5mm.

[0009] According to the battery cover provided by this utility model, the sum of the areas of all the contact surfaces is greater than or equal to 500 mm²; and / or, the ratio of the sum of the areas of all the contact surfaces to the area of ​​the cover body is 30% to 70%.

[0010] According to the battery cover provided by this utility model, the protruding structure is integrally formed with the cover body.

[0011] According to the battery cover provided by this utility model, along the thickness direction of the cover body, a receiving groove is formed on the inner side of the cover body corresponding to the protrusion structure, which can be used to accommodate the connecting piece.

[0012] According to the battery cover provided by this utility model, the two protruding structures are symmetrically arranged on both sides of the cover body along the first direction.

[0013] According to the battery cover provided by this utility model, along the thickness direction of the cover body, the height of the end face of the electrode post is less than the height of the contact surface.

[0014] According to the battery cover provided by this utility model, at least one of the protruding structures is provided with a liquid injection port.

[0015] Another aspect of this utility model provides a battery cell, including: a battery cover, a housing, and an electrode assembly.

[0016] The battery cover is disposed on the housing, and the electrode assembly is disposed inside the housing.

[0017] The battery cover and battery cell provided by this utility model, by setting a protruding structure on the main body of the cover, can contact the structural components of the battery pack (such as liquid cooling plates) to provide support and fixation for the battery cell, thereby improving the stability of the battery cell within the battery pack and enhancing the overall structural strength of the battery pack. Simultaneously, by placing the explosion-proof valve between the two protruding structures and positioning the two terminals on the side of the protruding structures away from the explosion-proof valve along a first direction, the protruding structures can separate the explosion-proof valve and the terminals, achieving thermoelectric separation and preventing the explosion-proof valve from affecting the electrical connections such as the terminals when activated.

[0018] Additional aspects and advantages of this invention 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 the invention. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is one of the schematic diagrams of a battery casing provided in one embodiment of this utility model.

[0021] Figure 2 This is a second schematic diagram of the battery casing provided in one embodiment of this utility model.

[0022] Figure 3 This is the third schematic diagram of the battery casing provided in one embodiment of this utility model.

[0023] Figure 4 This is a schematic diagram of the structure of a battery cell provided in the second embodiment of this utility model.

[0024] Figure 5 This is one of the cross-sectional views of a battery cell provided in the second embodiment of this utility model.

[0025] Figure 6 This is the second cross-sectional view of a battery cell provided in the second embodiment of this utility model.

[0026] Figure 7 This is one of the schematic diagrams of the battery casing provided in the third embodiment of this utility model.

[0027] Figure 8 This is the second schematic diagram of the battery casing provided in the third embodiment of this utility model.

[0028] Figure 9 This is a cross-sectional view of the battery casing provided in Embodiment 3 of this utility model.

[0029] Figure 10 This is a schematic diagram of a battery cell provided in Embodiment 4 of this utility model.

[0030] Figure 11 This is one of the cross-sectional views of a battery cell provided in Embodiment 4 of this utility model.

[0031] Figure 12 This is the second cross-sectional view of a battery cell provided in the fourth embodiment of this utility model.

[0032] Figure 13 yes Figure 12 A magnified view of part A in the diagram.

[0033] Figure label: 100. Battery cover; 110. Cover body; 111. Protruding structure; 1111. Contact surface; 1112. Receiving groove; 1113. Liquid filling port; 112. Outer edge; 1121. Abutment part; 120. Explosion-proof valve; 130. Terminal post; 200. Housing; 300. Electrode group; 400. Connecting piece. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model 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. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0037] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0039] The following is combined Figures 1 to 13 This invention describes the battery cover and battery cell provided by this utility model.

[0040] It should be noted that the first and second directions referred to in the embodiments of this utility model can both refer to... Figure 1 and Figure 7 The arrows shown in the diagram indicate the direction of the cover body 110. The first direction can be understood as the length direction of the cover body 110, and the second direction can be understood as the width direction of the cover body 110.

[0041] See Figures 1 to 3 As shown, the battery cover 100 provided in this embodiment of the present invention includes: a cover body 110, an explosion-proof valve 120, and a terminal post 130.

[0042] The cover body 110 has two protruding structures 111 spaced apart along the first direction. The protruding structures 111 have a contact surface 1111 that contacts the structural components of the battery pack. The explosion-proof valve 120 is disposed on the cover body 110 and is located between the two protruding structures 111. Along the first direction, the cover body 110 has a pole post 130 on the side of each protruding structure 111 away from the explosion-proof valve 120.

[0043] The battery cover 100 and battery cell provided by this utility model, by providing a protruding structure 111 on the cover body 110, can contact the structural components of the battery pack (such as liquid cooling plates) to provide support and fixation for the battery cell, thereby improving the stability of the battery cell within the battery pack and enhancing the overall structural strength of the battery pack. Simultaneously, the explosion-proof valve 120 is positioned between the two protruding structures 111, and the two terminals 130 are respectively positioned on the side of the protruding structure 111 away from the explosion-proof valve 120 along the first direction. This allows the protruding structure 111 to separate the explosion-proof valve 120 and the terminals 130, achieving thermoelectric separation and preventing the explosion-proof valve 120 from affecting the electrical connections such as the terminals 130 when it is activated.

[0044] Specifically, the protruding structure 111 on the cover plate body 110 can be implemented in various ways. For example, the protruding structure 111 can be an independent structure / component, fixedly connected to the cover plate body 110 by welding or other methods. This method allows for more flexible design and manufacturing of the protruding structure 111, enabling the selection of different materials, shapes, or sizes according to actual needs. It can also be manufactured, tested, and replaced individually, facilitating optimization and maintenance. Alternatively, the protruding structure 111 can be integrally formed with the cover plate body 110, meaning that the protruding structure 111 is designed as part of the cover plate body 110 during the manufacturing process. This method reduces assembly steps, improves production efficiency, and eliminates the need for additional connectors, thus reducing potential connection strength issues and enhancing the integrity and stability of the cover plate body 110.

[0045] The two protruding structures 111 can have the same or different dimensions and specifications, without special restrictions. For example, the two protruding structures 111 can have the same structure and the same size (e.g., Figures 1 to 3 The square protrusion structure 111 shown.

[0046] The explosion-proof valve 120 provides safety protection for the battery cells, releasing pressure when the internal pressure of the battery cell abnormally increases to prevent the battery from exploding or rupturing. The terminals 130 connect the positive and negative terminals of the battery to external circuits, serving as the output terminals of the internal electrochemical reaction and conducting current, enabling the battery to operate normally with external devices. The explosion-proof valve 120 is located on the cover body 110 between two protruding structures 111. The two terminals 130 are located on the outer sides of the corresponding protruding structures 111, thus separating the terminals 130 from the explosion-proof valve 120 and achieving thermoelectric separation.

[0047] See Figures 1 to 3 As shown, according to some embodiments of the present invention, the explosion-proof valve 120 has a gap between its two sides along the first direction and the corresponding protruding structure 111 (see [reference]). Figure 3 (As shown in L1).

[0048] By setting a gap between the explosion-proof valve 120 and the corresponding protruding structure 111 on both sides along the first direction, interference between the explosion-proof valve 120 and the protruding structure 111 when it is triggered can be avoided.

[0049] It should be noted that the spacing between the two sides of the explosion-proof valve 120 along the first direction and the corresponding protruding structure 111 can be the same or different, and no special limitation is made in this regard. See Figure 3 As shown, for example, the distance between the first side (left side in the figure) of the explosion-proof valve 120 and the left protrusion 111 is the same as the distance between the second side (right side in the figure) of the explosion-proof valve 120 and the right protrusion 111.

[0050] See Figures 1 to 3 As shown, according to some embodiments of the present invention, the spacing is 1mm to 5mm.

[0051] By setting the distance between the side portion of the explosion-proof valve 120 along the first direction and the corresponding side protrusion 111 to 1mm to 5mm, interference between the explosion-proof valve 120 and the protrusion 111 when triggered can be avoided, while reducing the distance between the two protrusions 111 (i.e., reducing the installation space occupied by the explosion-proof valve 120), making the battery cover 100 more compact. At the same time, more space can be reserved on the cover body 110 for setting the protrusions 111.

[0052] As an example, the distance between the side of the explosion-proof valve 120 along the first direction and the corresponding side protrusion structure 111 can be 1mm, 2mm, 3mm, 4mm or 5mm.

[0053] See Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the sum of the areas of all contact surfaces 1111 is greater than or equal to 500 mm².

[0054] By setting the sum of the areas of all contact surfaces 1111 to be greater than or equal to 500 mm², the cover body 110 and the structural components of the battery pack can have sufficient contact area 1111, improving the stability of the contact, thereby further enhancing the stability of the battery cells in the battery pack and improving the overall structural strength of the battery pack.

[0055] As an example, the sum of the areas of all contact surfaces 1111 can be 500mm², 1000mm², or 2000mm², etc.

[0056] See Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the sum of the areas of all contact surfaces 1111 is 30% to 70% of the area of ​​the cover body 110.

[0057] By setting the area ratio between the sum of the areas of all contact surfaces 1111 and the area of ​​the cover body 110 to 30% to 70%, it is possible to ensure that the protruding structure 111 provides support and fixation for the battery cells, improves the stability of the battery cells in the battery pack, and enhances the overall structural strength of the battery pack. At the same time, the space occupied by the protruding structure 111 is within a reasonable range, and the protruding structure 111 avoids encroaching on the installation space of components such as the terminal post 130 or the explosion-proof valve 120 located on the cover body 110.

[0058] As an example, the ratio of the area of ​​the contact surface 1111 to the area of ​​the cover body 110 can be 30%, 40%, 50%, 60%, or up to 70%. For example, when the area of ​​the contact surface 1111 is 1500 mm², the total area of ​​the cover body 110 should be at least 5000 mm².

[0059] See Figures 1 to 3 As shown, according to some embodiments of the present invention, the protruding structure 111 is integrally formed with the cover plate body 110.

[0060] By integrating the protruding structure 111 with the cover body 110, the structure of the cover body 110 can be simplified, and the integrity and compactness of the cover body 110 can be improved.

[0061] At the same time, it can simplify the processing and manufacturing process of the cover plate body 110. For example, during the stamping of the cover plate body 110, the protruding structure 111 can be formed together with the cover plate body 110 in one die process, making the manufacturing process of the entire cover plate body 110 structure more efficient and reducing the complexity of subsequent processing and assembly. At the same time, through precise die design, the position and size accuracy of the protruding structure 111 can be guaranteed, ensuring the consistency of the final product quality.

[0062] See Figures 1 to 3 As shown, according to some embodiments of the present invention, along the thickness direction of the cover plate body 110, a receiving groove 1112 is formed on the inner side of the cover plate body 110 corresponding to the protrusion structure 111, which can be used to accommodate the connecting piece 400.

[0063] By forming a receiving groove 1112 on the inner side of the corresponding protrusion 111 in the cover plate body 110, the connecting piece 400 can be accommodated in the receiving groove 1112, avoiding the connecting piece 400 occupying extra space inside the housing 200, thereby improving the space utilization rate of the battery. At the same time, it can also increase the internal storage space of the battery cell to meet the need for accommodating more electrolyte.

[0064] It should be noted that the connecting piece 400 is an electrical connector used to connect the pole group 300 and the pole post 130.

[0065] Of course, in addition to the connecting piece 400, the depth and dimensions of the receiving groove 1112 can also be used to accommodate other components / structures (such as the tabs of the electrode assembly 300) inside the battery casing 200 by controlling the depth and dimensions of the receiving groove 1112, without any special limitations.

[0066] See Figures 1 to 3 As shown, according to some embodiments of the present invention, two protruding structures 111 are symmetrically arranged on both sides of the cover plate body 110 along the first direction.

[0067] By symmetrically arranging two protruding structures 111 on both sides of the cover plate body 110 along the first direction, the force on the cover plate body 110 can be effectively balanced, making the cover plate more stable during use. This avoids the cover plate body 110 from experiencing excessive or insufficient local force, which could lead to decreased stability.

[0068] See Figure 3 As shown, according to some embodiments of the present invention, along the thickness direction of the cover plate body 110, the height of the end face of the pole post 130 is less than the height of the contact surface 1111.

[0069] Along the thickness direction of the cover plate body 110, by setting the height of the end face of the pole post 130 to be less than the height of the contact surface 1111, it is possible to make the contact surface 1111 contact the structural components of the battery pack while leaving sufficient vertical installation space for the pole post 130 to prevent it from interfering with the structural components of the battery pack.

[0070] Of course, in some embodiments, when the terminal post 130 of the battery cell meets the spatial layout requirements for assembly in the battery pack, the end face of the terminal post 130 can be located outside the contact surface 1111, or the end face of the terminal post 130 can be set to be flush with the contact surface 1111 (i.e., located on the same plane).

[0071] See Figures 1 to 3 As shown, according to some embodiments of the present invention, at least one protruding structure 111 is provided with an injection port 1113.

[0072] By placing the injection port 1113 on the protruding structure 111, electrolyte can be injected into the housing 200 through the injection port 1113. Simultaneously, the injection port 1113 does not affect the arrangement of other components on the cover body 110 (such as the electrode post 130), thus optimizing the structural layout of the cover body 110. Furthermore, since the protruding structure 111 is higher than the cover body 110, electrolyte leakage can be prevented after the electrolyte filling is completed.

[0073] The following describes the battery cell provided by this utility model. The battery cell described below can be referred to in correspondence with the battery cover plate 100 described above.

[0074] See Figures 4 to 6 As shown, the battery cell provided in this embodiment of the present invention includes: a battery cover plate 100, a housing 200 and an electrode assembly 300. The battery cover plate 100 is disposed in the housing 200 and the electrode assembly 300 is disposed inside the housing 200.

[0075] The battery cell provided by this utility model, due to the use of the battery cover plate 100 as described in any of the previous embodiments, can also use the protruding structure 111 to contact the structural components of the battery pack (such as liquid cooling plates) to provide support and fixation for the battery cell, thereby improving the stability of the battery cell within the battery pack and enhancing the overall structural strength of the battery pack. Simultaneously, by placing the explosion-proof valve 120 between the two protruding structures 111 and placing the two terminals 130 on the outer side of the protruding structures 111 along the first direction, the protruding structures 111 can separate the explosion-proof valve 120 and the terminals 130, achieving thermoelectric separation and preventing the explosion-proof valve 120 from affecting the electrical connections such as the terminals 130 when it is activated.

[0076] The battery cover 100 and battery cell provided in other embodiments of the present invention will now be described.

[0077] See Figures 7 to 13 As shown, the battery cover 100 provided in this embodiment of the present invention includes: a cover body 110, an explosion-proof valve 120, and a terminal post 130.

[0078] The cover body 110 has two protruding structures 111 spaced apart along the first direction. The protruding structures 111 have a contact surface 1111 that contacts the structural components of the battery pack. An explosion-proof valve 120 is disposed on the cover body 110 and is located between the two protruding structures 111. A pole post 130 is provided on the outer side of each protruding structure 111 along the first direction on the cover body 110.

[0079] The cover body 110 has an outer edge 112 along the circumferential direction. The outer edge 112 includes two first side edges arranged opposite each other along a first direction and two second side edges arranged opposite each other along a second direction. The first side edges and / or the second side edges are provided with abutment portions 1121, and in the assembled state, the abutment portions 1121 abut against the port of the battery housing 200 (see...). Figures 10 to 13 (As shown).

[0080] When the contact surface 1111 of the protruding structure 111 contacts the structural components of the battery pack, it applies a vertical force to the cover body 110. By providing an abutment part 1121 on the outer edge 112 (first side edge and / or second side edge) of the cover body 110 and abutting with the port of the housing 200 during assembly, most of the force can be borne by the abutment part, which can effectively avoid problems such as weld deformation or failure caused by the weld bearing the force alone.

[0081] It is understood that the abutment portion 1121 may be provided only on the two oppositely arranged first side edges or the two oppositely arranged second side edges, or the abutment portion 1121 may be provided on both the two oppositely arranged first side edges and the two oppositely arranged second side edges. In specific implementation, the selection can be made according to the actual structure and load requirements of the cover plate body 110, and no special limitation is made in this regard.

[0082] The abutment portion 1121 can adopt various structural forms, and the specific choice depends on the usage requirements and assembly process of the cover body 110, without any special limitations. For example, a raised flange type, etc.

[0083] See Figures 7 to 9 As shown, according to some embodiments of the present invention, the length of the first side edge is greater than the length of the second side edge, and the first side edge is provided with an abutment portion 1121.

[0084] By providing the abutment portion 1121 on the longer of the first and second side edges, the contact support force between the cover body 110 and the port of the housing 200 can be fully guaranteed, thereby improving structural stability.

[0085] Specifically, since the length of the first side edge is greater than the length of the second side edge, by providing the abutment portion 1121 on the first side edge, the abutment contact area 1111 can be increased to a greater extent, thereby providing stronger and more stable support. It can also effectively disperse the support force and reduce local stress concentration.

[0086] See Figures 7 to 9 As shown, according to some embodiments of the present invention, both the first side edge and the second side edge are provided with an abutment portion 1121.

[0087] By providing abutment portions 1121 on both the first and second side edges, the contact support force between the cover plate body 110 and the port of the housing 200 can be further enhanced, thereby improving structural stability.

[0088] Specifically, since both the first and second side edges are provided with abutment portions 1121, they can simultaneously abut and cooperate with the ports of the housing 200, thereby achieving a more uniform distribution of support force, which in turn enhances the contact support force between the cover body 110 and the ports of the housing 200, and improves structural stability.

[0089] See Figure 13 As shown, according to some embodiments of the present invention, the first side edge and / or the second side edge are provided with a protruding edge, and the protruding edge forms an abutment portion 1121 on the side facing the port of the housing 200.

[0090] By setting the abutment portion 1121 as a raised edge structure, strong support performance can be provided. Moreover, the raised edge structure is simple and easy to process and manufacture.

[0091] Specifically, in the assembled state, the side of the flange facing the port of the housing 200 (i.e., the inner surface of the flange) contacts the port of the housing 200, which can significantly increase the contact area and thus provide stronger support performance.

[0092] In addition, when the battery cell provided by this utility model is applied to the battery pack, liquid cooling plates can be provided on both the side where the cover body 110 is located and the side where the bottom plate of the housing 200 is located to achieve dual-sided cooling and improve the cooling efficiency of the battery pack.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cover, characterized in that, include: The cover plate body has two protruding structures spaced apart along a first direction, and the protruding structures have contact surfaces that contact the structural components of the battery pack. An explosion-proof valve is disposed on the cover plate body and is located between the two protruding structures; The pole post is provided on the side of each of the protruding structures away from the explosion-proof valve along the first direction.

2. The battery cover according to claim 1, characterized in that, The explosion-proof valve has a spacing L1 between its two sides along the first direction and the corresponding protruding structure.

3. The battery cover according to claim 2, characterized in that, The value range of the spacing L1 is 1mm ≤ L1 ≤ 5mm.

4. The battery cover according to claim 1, characterized in that, The sum of the areas of all the contact surfaces is greater than or equal to 500 mm²; And / or, the sum of the areas of all the contact surfaces is 30% to 70% of the area of ​​the cover body.

5. The battery cover according to claim 1, characterized in that, The protruding structure is integrally formed with the cover plate body.

6. The battery cover according to claim 5, characterized in that, Along the thickness direction of the cover plate body, a receiving groove is formed on the inner side of the cover plate body corresponding to the protrusion structure, which can be used to accommodate the connecting piece.

7. The battery cover according to claim 1, characterized in that, The two protruding structures are symmetrically arranged on both sides of the cover plate body along the first direction.

8. The battery cover according to claim 1, characterized in that, Along the thickness direction of the cover plate body, the height of the end face of the pole is less than the height of the contact surface.

9. The battery cover according to claim 1, characterized in that, At least one of the protruding structures is provided with an injection port.

10. A single battery cell, characterized in that, include: The battery cover as described in any one of claims 1 to 9; The housing, wherein the battery cover is disposed on the housing; The electrode assembly is disposed within the housing.

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