Battery cover plate, battery monomer and battery pack

Abstract

The application relates to the technical field of power batteries, and provides a battery cover plate, a battery monomer and a battery pack. The battery cover plate comprises a cover plate main body; two protruding structures are arranged on the cover plate main body and are spaced apart along a first direction, the protruding structures are provided with contact surfaces for contacting structural members of the battery pack; an explosion-proof valve hole is arranged between the two protruding structures, and a pole hole is arranged on one side of each protruding structure away from the explosion-proof valve hole along the first direction; wherein first intervals G1 are arranged between the two sides of the explosion-proof valve hole along the first direction and the corresponding protruding structures, the first interval G1 is 1.5T <= G1 <= 2T, a second interval G2 is arranged between the pole hole and the corresponding side protruding structure along the first direction, the second interval G2 is 1.5T <= G2 <= 2T, and T is the thickness of the cover plate main body. The battery cover plate, the battery monomer and the battery pack provided by the application solve the defects in the prior art that the overall strength of the battery pack is low, which may affect the stability and safety of the battery pack when the battery pack is subjected to external impact or pressure.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, and in particular to a battery cover, a battery cell, and a battery pack. 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. Summary of the Invention

[0004] This invention provides a battery cover, a battery cell, and a battery pack to address the shortcomings of existing technologies where the overall strength of the battery pack is low, which may affect its stability and safety when subjected to external impacts or pressure.

[0005] The first aspect of the present invention provides a battery cover, comprising: a cover body.

[0006] The cover plate body has two protruding structures spaced apart along a first direction. The protruding structures have contact surfaces that contact the structural components of the battery pack. An explosion-proof valve hole is provided between the two protruding structures. The explosion-proof valve hole is used to install an explosion-proof valve. Along the first direction, the cover plate body has a pole hole on the side of each protruding structure away from the explosion-proof valve hole. The pole hole is used to install a pole.

[0007] Wherein, the explosion-proof valve hole is provided with a first distance G1 between both sides of the corresponding protrusion structure along the first direction, the first distance G1 is 1.5T≤G1≤2T, T is the thickness of the cover plate body, and the pole hole is provided with a second distance G2 between the corresponding side protrusion structure along the first direction, the second distance G2 is 1.5T≤G2≤2T.

[0008] The battery cover provided by the present invention further includes: an inner support pad, which is disposed on the inner wall of the cover body along the thickness direction of the cover body. The inner support pad is provided with an explosion-proof valve protection structure and an injection port protection structure. Along the thickness direction of the cover body, the distance between the explosion-proof valve protection structure and the cover body is greater than the distance between the injection port protection structure and the cover body.

[0009] According to the battery cover provided by the present invention, the inner wall of the cover body is provided with groove structures on both sides of the explosion-proof valve hole along the second direction, and the groove structures extend along the first direction of the cover body.

[0010] According to the battery cover provided by the present invention, the groove structure is located outside the explosion-proof valve hole along the second direction. Along the first direction, the length of the groove structure (114) is greater than the length of the explosion-proof valve hole (112), and the difference between the length of the groove structure along the first direction and the length of the explosion-proof valve hole along the first direction is greater than or equal to 2 mm; and / or, the length L1 of the explosion-proof valve hole along the first direction is 12 mm ≤ L1 ≤ 60 mm, and the length L2 of the groove structure along the first direction is 16 mm ≤ L2 ≤ 75 mm.

[0011] According to the battery cover provided by the present invention, a third spacing G3 is provided between the terminal hole and the edge of the cover body along the first direction, wherein the third spacing G3 is G3≥2.5mm.

[0012] According to the battery cover provided by the present invention, the protruding structure is integrally disposed with the cover body, and a receiving groove is formed on the inner side of the cover body corresponding to the protruding structure along the thickness direction of the cover body.

[0013] According to the battery cover provided by the present invention, 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%.

[0014] The battery cover provided by the present invention further includes: an explosion-proof valve and a terminal post, wherein the explosion-proof valve is disposed in the explosion-proof valve hole and the terminal post is disposed in the terminal post hole.

[0015] A second aspect of the present invention provides a battery cell, comprising: a battery cover, a first housing, and an electrode assembly, wherein the battery cover is disposed in the first housing, and the electrode assembly is disposed within the first housing.

[0016] A third aspect of the present invention provides a battery pack, comprising: a second housing, a battery cell, and a liquid cooling assembly.

[0017] The second housing is provided with a mounting groove; the battery cell is disposed in the mounting groove; the liquid cooling assembly includes a first liquid cooling plate and a second liquid cooling plate, both of which are disposed in the second housing, the first liquid cooling plate is connected to the contact surface, and the second liquid cooling plate is connected to the bottom wall of the first housing.

[0018] The battery cover provided by this invention, by setting protruding structures on the cover body, can contact the structural components of the battery pack (such as liquid cooling plates) to provide support and fixation for the battery cells, improving the stability of the battery cells within the battery pack and enhancing the overall structural strength of the battery pack. Furthermore, because the battery cells can bear loads, the clearance space between the battery cells and the structural components of the battery pack can be eliminated, allowing for an increase in the overall height of the battery cells and thus increasing their capacity. Simultaneously, by placing the explosion-proof valve hole between the two protruding structures and placing the two terminal hole on the outer side of the protruding structures 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 terminals and other electrical connections when activated. In addition, by setting the positional parameters of the explosion-proof valve hole and the terminal hole, the strength of the area where the explosion-proof valve is located can be ensured, preventing deformation or cracking of the explosion-proof valve due to welding heat, vibration, impact, or thermal runaway. It also ensures the strength of the terminal hole and the assembly performance of other structural components of the cover body (such as outer and inner support pads).

[0019] Additional aspects and advantages of the 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

[0020] To more clearly illustrate the technical solutions in this invention 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 invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is one of the schematic diagrams of the battery cover provided in the embodiment of the present invention.

[0022] Figure 2 This is a second schematic diagram of the battery cover provided in an embodiment of the present invention.

[0023] Figure 3 This is the third schematic diagram of the battery cover provided in the embodiment of the present invention.

[0024] Figure 4 This is the fourth schematic diagram of the battery cover provided in the embodiment of the present invention.

[0025] Figure 5 This is the fifth schematic diagram of the battery cover provided in the embodiment of the present invention.

[0026] Figure 6 This is one of the schematic diagrams of the inner support pad in the battery cover provided in the embodiment of the present invention.

[0027] Figure 7 This is the second schematic diagram of the inner support pad in the battery cover provided in the embodiment of the present invention.

[0028] Figure 8 This is the third schematic diagram of the inner support pad in the battery cover provided in the embodiment of the present invention.

[0029] Figure 9 This is one of the schematic diagrams of a battery cell provided in an embodiment of the present invention.

[0030] Figure 10 This is a second schematic diagram of a battery cell provided in an embodiment of the present invention.

[0031] Figure 11 This is the third schematic diagram of a battery cell provided in an embodiment of the present invention.

[0032] Figure 12 This is a schematic diagram of a battery cell assembled in a battery pack according to an embodiment of the present invention.

[0033] Figure label:

[0034] 100. Battery cover; 110. Cover body; 111. Raised structure; 1111. Contact surface; 1112. Liquid filling port; 1113. Receiving groove; 112. Explosion-proof valve hole; 113. Terminal hole; 114. Groove structure; 120. Inner support pad; 121. Explosion-proof valve protection structure; 122. Liquid filling port protection structure; 130. Explosion-proof valve; 140. Terminal; 200. First housing; 300. Electrode group; 400. Connecting piece; 500. Liquid cooling assembly; 510. First liquid cooling plate; 520. Second liquid cooling plate. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0036] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention 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 the present invention. 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.

[0037] In the description of the embodiments of the present invention, 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 the present invention according to the specific circumstances.

[0038] In embodiments of the present invention, 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.

[0039] 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.

[0040] The following is combined with Figures 1 to 12 This invention describes the battery cover, battery cell, and battery pack provided by the present invention.

[0041] It should be noted that the first and second directions referred to in the embodiments of the present invention can both refer to... Figure 1 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.

[0042] See Figure 1 and Figure 2 As shown, the battery cover 100 provided in this embodiment of the invention includes: a cover body 110.

[0043] The cover plate body 110 is provided with 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 hole 112 is provided between the two protruding structures 111. The explosion-proof valve hole 112 is used to install an explosion-proof valve 130. Along the first direction, a pole hole 113 is provided on the side of each protruding structure 111 away from the explosion-proof valve hole 112. The pole hole 113 is used to install a pole 140.

[0044] The explosion-proof valve hole 112 is provided with a first distance G1 between its two sides and the corresponding protrusion structure 111 along the first direction. The first distance G1 is 1.5T≤G1≤2T, where T is the thickness of the cover plate body 110. The pole hole 113 is provided with a second distance G2 between its two sides and the corresponding side protrusion structure 111 along the first direction. The second distance G2 is 1.5T≤G2≤2T.

[0045] The battery cover 100 provided by this invention, 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 cells, thereby improving the stability of the battery cells within the battery pack and enhancing the overall structural strength of the battery pack. Furthermore, since the battery cells can bear loads, the clearance space between the battery cells and the structural components of the battery pack can be eliminated, and the overall height of the battery cells can be increased to enhance their capacity. Simultaneously, by placing the explosion-proof valve hole 112 between the two protruding structures 111 and placing the two terminal hole 113 on the outer side of the protruding structures 111 along the first direction, the explosion-proof valve 130 and the terminal 140 can be separated by the protruding structures 111, achieving thermoelectric separation and preventing the explosion-proof valve 130 from affecting the electrical connections such as the terminal 140 when it is activated. In addition, by setting the position parameters of the explosion-proof valve hole 112 and the pole hole 113, the strength of the area where the explosion-proof valve 130 is located can be guaranteed, preventing the explosion-proof valve 130 from deforming or cracking due to welding heat, vibration, impact, or thermal runaway. It can also guarantee the strength of the pole hole 113 and the assembly performance of other structural components of the cover plate body 110 (such as the outer support pad and the inner support pad 120).

[0046] Additionally, see Figure 12 As shown, the battery cover 100 provided by the present invention, by setting a protruding structure 111, can simultaneously set liquid cooling plates on both the side where the battery cover 100 is located and the side where the bottom plate of the first housing 200 is located when it is applied to battery cells and battery packs, so as to achieve dual-sided cooling and improve the cooling efficiency of the battery pack.

[0047] 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.

[0048] 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., Figure 1 (The square protrusion structure 111 shown). It can be understood that, in order to ensure that the contact surfaces 1111 of the two protrusion structures 111 can contact the structural components of the battery pack, the height of the contact surfaces 1111 of the two protrusion structures 111 must be consistent along the thickness direction of the cover body 110.

[0049] The cover plate body 110 is provided with an explosion-proof valve hole 112 and a terminal hole 113. The explosion-proof valve hole 112 is used to install an explosion-proof valve 130, which provides safety protection for the battery cells by releasing pressure when the internal pressure of the battery cell abnormally increases, preventing the battery from exploding or rupturing. The terminal hole 113 is used to install a terminal 140, which connects the positive and negative terminals of the battery to an external circuit. It is the output terminal of the internal electrochemical reaction of the battery, conducting current and enabling the battery to operate normally with external devices. The explosion-proof valve hole 112 is located on the cover plate body 110 between two protruding structures 111, and the two terminal holes 113 are located on the outer sides of the corresponding protruding structures 111. Thus, the protruding structures 111 can separate the terminal 140 from the explosion-proof valve 130, achieving thermoelectric separation.

[0050] See Figure 1As shown, a first distance G1 is provided between the explosion-proof valve hole 112 and the corresponding protruding structure 111 on both sides along the first direction. The first distance G1 is 1.5T≤G1≤2T. A second distance G2 is provided between the pole hole 113 and the corresponding side protruding structure 111 along the first direction. The second distance G2 is 1.5T≤G2≤2T, where T is the thickness of the cover plate body 110. The first distance G1 can be 1.5T, 1.8T, or 2T, etc., and the second distance can be 1.5T, 1.8T, or 2T, etc. By setting the position parameters of the explosion-proof valve hole 112 and the pole hole 113, the strength of the area where the explosion-proof valve 130 is located can be guaranteed, preventing the explosion-proof valve 130 from deforming or cracking due to welding heat, vibration, impact, or thermal runaway. It can also guarantee the strength of the pole hole 113 and the assembly performance of other structural components of the cover plate body 110 (such as the outer support pad and the inner support pad 120).

[0051] As an example, when the thickness of the cover plate body 110 is 2mm, the first spacing G1 is 3mm≤G1≤4mm, and the second spacing G2 is 3mm≤G2≤4mm.

[0052] See Figures 3 to 8 As shown, the battery cover 100 provided by the present invention further includes: an inner support pad 120, which is disposed on the inner wall of the cover body 110 along the thickness direction of the cover body 110. The inner support pad 120 is provided with an explosion-proof valve protection structure 121 and an injection port protection structure 122. Along the thickness direction of the cover body 110, the distance between the explosion-proof valve protection structure 121 and the cover body 110 is greater than the distance between the injection port protection structure 122 and the cover body 110.

[0053] An inner support pad 120 is provided to support and fix the terminal post 140 in conjunction with the outer support pad, and also serves as an insulating protective layer inside the battery cover 100, ensuring cell safety and lifespan through electrical isolation, leak-proof sealing, and mechanical buffering. The inner support pad 120 is equipped with an explosion-proof valve protection structure 121 and a liquid injection port protection structure 122, providing dual protection for the explosion-proof valve 130 and the liquid injection port 1112. Furthermore, since the inner end face of the explosion-proof valve protection structure 121 is located inside the inner end face of the liquid injection port protection structure 122, it prevents the end face of the liquid injection port protection structure 122 from scratching the electrode tab.

[0054] It is understandable that, since the inner support pad 120 is located on the inner wall of the cover plate body 110, the position of the inner support pad 120 corresponding to the protrusion structure 111 is adapted to the shape of the cover plate body 110.

[0055] It should be noted that at least one protruding structure 111 is provided with an injection port 1112, which is used to inject electrolyte into the battery cell. Meanwhile, the injection port 1112 does not affect the arrangement of other components (such as the terminal posts 140) on the cover body 110, 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.

[0056] See Figure 2 As shown, according to some embodiments of the present invention, the inner wall of the cover plate body 110 is provided with groove structures 114 on both sides of the explosion-proof valve hole 112 along the second direction, and the groove structures 114 extend along the first direction of the cover plate body 110.

[0057] By providing groove structures 114 extending along the first direction of the cover body 110 on both sides of the explosion-proof valve hole 112 along the second direction on the inner wall of the cover body 110, the structural strength of the installation area of ​​the explosion-proof valve 130 can be enhanced by the groove structures 114, thereby improving the deformation resistance of the installation area of ​​the explosion-proof valve 130 during welding and when subjected to vibration or impact. At the same time, the groove structures 114 can be formed by processes such as stamping, without encroaching on the installation space of other components of the battery cover 100, resulting in a compact structure.

[0058] See Figure 2 As shown, according to some embodiments of the present invention, the groove structure 114 is located on the outside of the explosion-proof valve hole 112 along the second direction. Along the first direction, the length of the groove structure 114 is greater than the length of the explosion-proof valve hole 112, and the difference between the length L2 of the groove structure 114 and the length L1 of the explosion-proof valve hole 112 along the first direction is greater than or equal to 2 mm.

[0059] By setting the groove structure 114 in the above manner, the structural reinforcement effect of the groove structure 114 can completely cover the installation area of ​​the explosion-proof valve 130, avoiding local deformation or breakage.

[0060] It is understandable that, along the projection direction parallel to the second direction, the projection of the groove structure 114 along the first direction completely covers the projection of the explosion-proof valve hole 112 along the first direction, indicating that: both sides of the explosion-proof valve 130 along the first direction are located inside the groove structure 114 along the first direction, or the two ends of the groove structure 114 along the first direction are respectively spaced from the two sides of the explosion-proof valve hole 112 along the first direction.

[0061] See Figure 2 As shown, according to some embodiments of the present invention, the length L1 of the explosion-proof valve hole 112 along the first direction is 12mm≤L1≤60mm, and the length L2 of the groove structure 114 along the first direction is 16mm≤L2≤75mm.

[0062] By setting the length L1 of the explosion-proof valve hole 112 along the first direction to 12mm≤L1≤60mm and the length L2 of the groove structure 114113 along the first direction to 16mm≤L2≤75mm, the structural reinforcement effect of the groove structure 114113 on the mounting hole area of ​​the explosion-proof valve 130 can be further optimized, thereby improving the deformation resistance of the mounting hole area of ​​the explosion-proof valve 130 during welding and when subjected to vibration or impact.

[0063] As an example, the length L1 of the explosion-proof valve hole 112 along the first direction can be 12mm, 15mm, 22mm, 30mm, 35mm, 40mm, 45mm, 50mm or 60mm, etc.; the length L2 of the groove structure 114113 along the first direction can be 16mm, 18mm, 28mm, 36mm, 45mm, 50mm, 54mm, 65mm, 72mm or 75mm, etc.

[0064] See Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, a third spacing G3 is provided between the pole hole 113 and the edge of the cover plate body 110 along the first direction, and the third spacing G3 is G3≥2.5mm.

[0065] By setting the third distance G3 between the pole hole 113 and the edge of the cover plate body 110 along the first direction to be greater than or equal to 2.5 mm, the structural strength of the cover plate body 110 in the area of ​​the pole hole 113 can be guaranteed, and the breakage of the cover plate body 110 in the area of ​​the pole hole 113 can be avoided when machining the pole hole 113.

[0066] As an example, the third spacing G3 can be 2.5mm, 3mm, or 5mm, etc.

[0067] As can be seen, by limiting the dimensions of the protrusion structure 111 and the groove structure 114, and limiting the installation positions of the explosion-proof valve 130 and the terminal post 140, the present invention can strengthen the stress distribution in the area near the explosion-proof valve 130, so that there is no cracking or deformation in the area near the explosion-proof valve 130 during welding, vibration, impact and thermal runaway tests, and improve the strength of the terminal post hole 113 and the assembly performance of other components on the cover plate body 110, thereby improving the reliability of the battery cell.

[0068] The experimental verification parameters are set as shown in Table 1 below.

[0069] Table 1: Experimental parameters of Examples 1 to 8 and Comparative Examples 1 to 3.

[0070]

[0071] In Table 1, G1 represents the first distance between the two sides of the explosion-proof valve hole 112 along the first direction and the corresponding protrusion structure 111, G2 represents the second distance between the pole hole 113 and the corresponding side protrusion structure 111 along the first direction, and G3 represents the third distance between the pole hole 113 and the edge of the cover plate body 110 along the first direction.

[0072] Experimental results show that in Examples 1 to 8, the process yield of the protrusion structure 111, the explosion-proof valve hole 112, and the pole hole 113 during stamping reached 99.99%, and the protrusion structure 111 met the strength requirements. During welding, vibration, impact, and thermal runaway tests, the explosion-proof valve 130 did not crack, and its reliability met the requirements.

[0073] In Comparative Example 1, the first distance G1 between the explosion-proof valve hole 112 and the corresponding protruding structure 111, and the second distance G2 between the pole hole 113 and the corresponding protruding structure 111, are both small. During the experiment, the protruding structure 111 is prone to cracking during the stamping process, resulting in the roundness of the pole hole 113 not meeting the usage requirements, and the stamping process defect rate is >10%. In Comparative Example 2, the third distance G3 between the pole hole 113 and the edge of the cover plate body 110 along the first direction is small. During the experiment, the roundness of the pole hole 113 is prone to not meeting the usage requirements, the dimensional accuracy of the cover plate body 110 is large, and the stamping process defect rate is >5%. In Comparative Example 3, the length L2 of the groove structure 114 along the first direction is less than the length L1 of the explosion-proof valve 130 along the first direction. The explosion-proof valve 130 has insufficient strength and is prone to cracking during welding, vibration, impact, and thermal runaway tests, and the cracking rate of the explosion-proof valve 130 is >3%, and the reliability does not meet the requirements.

[0074] See Figure 2 and Figure 10 As shown, according to some embodiments of the present invention, the protrusion structure 111 is integrally disposed with the cover plate body 110, and along the thickness direction of the cover plate body 110, a receiving groove 1113 is formed on the inner side of the cover plate body 110 corresponding to the protrusion structure 111 for accommodating the connecting piece 400.

[0075] By integrating the cover body 110 and the protruding structure 111, the structure of the cover body 110 is simplified, improving its overall integrity and compactness. The manufacturing process of the cover body 110 is also simplified. For example, during the stamping of the cover body 110, the protruding structure 111 can be formed together with the cover body 110 in a single mold process, making the manufacturing process of the entire cover body 110 structure more efficient and reducing the complexity of subsequent processing and assembly. Simultaneously, precise mold design ensures the accuracy of the position and dimensions of the protruding structure 111, guaranteeing the consistency of the final product's quality. Furthermore, by forming a receiving groove 1113 on the inner side of the cover body 110 corresponding to the protruding structure 111, this groove 1113 can be used to accommodate components such as the connecting piece 400, preventing the connecting piece 400 from occupying additional space inside the first housing 200, thereby improving the battery's space utilization. Additionally, it increases the internal space of the battery cell to accommodate more electrolyte.

[0076] It should be noted that the connecting piece 400 is an electrical connector used to connect the pole group 300 and the pole post 140.

[0077] Of course, in addition to the connecting piece 400, the depth and dimensions of the receiving groove 1113 can also be used to accommodate other components / structures (such as the tabs of the electrode assembly 300) inside the first battery casing 200 by controlling the depth and dimensions of the receiving groove 1113, without any special limitations.

[0078] See Figure 1 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.

[0079] 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.

[0080] As an example, the sum of the areas of all contact surfaces 1111 can be 500mm², 1000mm², or 2000mm², etc.

[0081] See Figure 1 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.

[0082] 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 140 or the explosion-proof valve 130 located on the cover body 110.

[0083] 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.

[0084] See Figure 4 and Figure 5 As shown, according to some embodiments of the present invention, the battery cover 100 further includes an explosion-proof valve 130 and a terminal post 140, wherein the explosion-proof valve 130 is disposed in the explosion-proof valve hole 112 and the terminal post 140 is disposed in the terminal post hole 113.

[0085] The explosion-proof valve 130 automatically releases pressure when the internal pressure of the battery is too high, preventing the battery from exploding due to internal gas expansion. The terminal 140 is used for the battery's current output and connection, ensuring the battery's normal operation. By setting up the explosion-proof valve 130 and the terminal 140, pressure changes inside the battery can be effectively controlled, and the stable electrical connection between the battery and external devices can be ensured, thereby improving battery safety and lifespan.

[0086] The battery cell provided by the present invention will be described below. The battery cell described below can be referred to in correspondence with the battery cover 100 described above.

[0087] See Figures 9 to 11 As shown, the battery cell provided in this embodiment of the invention includes: a battery cover plate 100, a first housing 200, and an electrode assembly 300. The battery cover plate 100 is disposed in the first housing 200, and the electrode assembly 300 is disposed inside the first housing 200.

[0088] The battery cell provided by this invention, due to the use of the battery cover plate 100 as described in any of the preceding embodiments, can also contact the structural components of the battery pack (such as liquid cooling plates) via the protruding structure 111, providing support and fixation for the battery cell, improving the stability of the battery cell within the battery pack and enhancing the overall structural strength of the battery pack. Furthermore, since the battery cell can bear loads, the clearance space between the battery cell and the structural components of the battery pack can be eliminated, and the overall height of the battery cell can be increased to enhance its capacity. Simultaneously, by placing the explosion-proof valve hole 112 between the two protruding structures 111 and placing the two terminal hole 113 on the outer side of the protruding structure 111 along the first direction, the protruding structure 111 can separate the explosion-proof valve 130 and the terminal 140, achieving thermoelectric separation and preventing the explosion-proof valve 130 from affecting the electrical connections such as the terminal 140 when activated. In addition, by setting the position parameters of the explosion-proof valve hole 112 and the pole hole 113, the strength of the area where the explosion-proof valve 130 is located can be guaranteed, preventing the explosion-proof valve 130 from deforming or cracking due to welding heat, vibration, impact, or thermal runaway. It can also guarantee the strength of the pole hole 113 and the assembly performance of other structural components of the cover plate body 110 (such as the outer support pad and the inner support pad 120).

[0089] The battery pack provided by the present invention will be described below. The battery pack described below can be referred to in correspondence with the battery cover plate 100 and battery cell described above.

[0090] See Figure 12 As shown, the battery pack provided in this embodiment of the invention includes: a second housing, a battery cell, and a liquid cooling assembly 500.

[0091] The second housing is provided with a mounting groove; the battery cell is located in the mounting groove; the liquid cooling assembly 500 includes a first liquid cooling plate 510 and a second liquid cooling plate 520, both of which are located in the second housing. The first liquid cooling plate 510 is connected to the contact surface 1111, and the second liquid cooling plate 520 is connected to the bottom wall of the first housing 200.

[0092] The battery pack provided by this invention, by employing battery cells as described in any of the preceding embodiments, can also utilize the protruding structure 111 to contact the structural components of the battery pack (such as liquid cooling plates), providing support and fixation for the battery cells, improving the stability of the battery cells within the battery pack and enhancing the overall structural strength of the battery pack. Furthermore, since the battery cells can bear loads, the clearance space between the battery cells and the structural components of the battery pack can be eliminated, and the overall height of the battery cells can be increased to enhance their capacity. Simultaneously, by placing the explosion-proof valve hole 112 between the two protruding structures 111 and placing the two terminal hole 113 on the outer side of the protruding structure 111 along the first direction, the protruding structure 111 can separate the explosion-proof valve 130 and the terminal 140, achieving thermoelectric separation and preventing the explosion-proof valve 130 from affecting the electrical connections such as the terminal 140 when activated. In addition, by setting the position parameters of the explosion-proof valve hole 112 and the pole hole 113, the strength of the area where the explosion-proof valve 130 is located can be guaranteed, preventing the explosion-proof valve 130 from deforming or cracking due to welding heat, vibration, impact, or thermal runaway. It can also guarantee the strength of the pole hole 113 and the assembly performance of other structural components of the cover plate body 110 (such as the outer support pad and the inner support pad 120).

[0093] It should be noted that the first liquid cooling plate 510 can be in direct contact with the contact surface 1111, or it can be connected by thermally conductive adhesive. Similarly, the second liquid cooling plate 520 can be in direct contact with the bottom wall of the first housing 200, or it can be connected by thermally conductive adhesive.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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; and these 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 the present invention.

Claims

1. A battery cover, characterized in that, include: Cover plate body; The cover plate body is provided with two protruding structures spaced apart along the first direction, and the protruding structures have contact surfaces that contact the structural components of the battery pack; An explosion-proof valve hole is provided between the two protruding structures. The explosion-proof valve hole is used to install an explosion-proof valve. Along the first direction, a pole hole is provided on the side of each protruding structure away from the explosion-proof valve hole. The pole hole is used to install a pole. Wherein, the explosion-proof valve hole is provided with a first distance G1 between both sides of the corresponding protrusion structure along the first direction, the first distance G1 is 1.5T≤G1≤2T, the pole hole is provided with a second distance G2 between the corresponding side protrusion structure along the first direction, the second distance G2 is 1.5T≤G2≤2T, and T is the thickness of the cover plate body; The inner wall of the cover plate body is provided with groove structures on both sides of the explosion-proof valve hole along the second direction, and the groove structures extend along the first direction of the cover plate body; The groove structure is located on the outside of the explosion-proof valve hole along the second direction. Along the first direction, the length of the groove structure is greater than the length of the explosion-proof valve hole, and the difference between the length of the groove structure and the length of the explosion-proof valve hole is greater than or equal to 2mm; and / or, the length L1 of the explosion-proof valve hole along the first direction is 12mm≤L1≤60mm, and the length L2 of the groove structure along the first direction is 16mm≤L2≤75mm. A third spacing G3 is provided between the pole post hole and the edge of the cover plate body along the first direction, wherein the third spacing G3 is G3≥2.5mm.

2. The battery cover according to claim 1, characterized in that, Also includes: An inner support pad is provided on the inner wall of the cover plate body along the thickness direction. The inner support pad is provided with an explosion-proof valve protection structure and an injection port protection structure. Along the thickness direction of the cover plate body, the distance between the explosion-proof valve protection structure and the cover plate body is greater than the distance between the injection port protection structure and the cover plate body.

3. The battery cover according to claim 1, characterized in that, The protruding structure is integrally formed with the cover plate body, and a receiving groove is formed on the inner side of the cover plate body corresponding to the protruding structure along the thickness direction of the cover plate body.

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. 2 ; 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, Also includes: An explosion-proof valve, wherein the explosion-proof valve is disposed in the explosion-proof valve orifice; The electrode post is disposed in the electrode post hole.

6. A single battery cell, characterized in that, include: The battery cover as described in any one of claims 1 to 5; A first housing, wherein the battery cover is disposed in the first housing; The electrode assembly is disposed within the first housing.

7. A battery pack, characterized in that, include: The second housing is provided with a mounting groove. ； The battery cell as described in claim 6, wherein the battery cell is disposed within the mounting groove; A liquid cooling assembly, comprising a first liquid cooling plate and a second liquid cooling plate, both disposed on a second housing, wherein the first liquid cooling plate is connected to the contact surface and the second liquid cooling plate is connected to the bottom wall of the first housing.

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