Battery cell and battery pack

Abstract

The utility model relates to power battery technical field provides a kind of battery monomer and battery package.Battery monomer includes first shell, cover plate, pole, pole group and explosion-proof valve;Cover plate is located in first shell, and cover plate is equipped with convex structure, and convex structure has the contact surface with the structural member of battery package contact;Explosion-proof valve is located in the bottom wall of first shell.The battery monomer provided by the utility model can contact the structural member (such as liquid cooling plate) of battery package by convex structure, provide support and fixation effect for battery monomer, improve the stability of battery monomer in battery package and the overall structural strength of battery package.Meanwhile, by setting the explosion-proof valve on the bottom wall of the first shell, the thermal-electric separation can be achieved, and the influence on the electrical connections such as the pole caused by the activation of the explosion-proof valve can be avoided.In addition, when applied to the battery package, liquid cooling plates can be arranged on both the side of the cover plate and the side of the bottom plate of the first shell, achieving double-sided cooling to improve the cooling efficiency of the battery package.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery cell and 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. Utility Model Content

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

[0005] This utility model provides a battery cell, including: a first housing, a cover plate, terminals, electrode groups, and an explosion-proof valve.

[0006] The cover plate is disposed on the first housing, and the cover plate has a protruding structure with a contact surface that contacts the structural components of the battery pack; the pole post is disposed on the cover plate; the pole assembly is disposed inside the first housing; and the explosion-proof valve is disposed on the bottom wall of the first housing.

[0007] According to the battery cell provided by this utility model, the protruding structure is integrally formed with the cover plate.

[0008] According to the battery cell provided by this utility model, the cover plate has a receiving groove formed on the inner side of the protruding structure, which can be used to accommodate the connecting piece, and the connecting piece is used to connect with the terminal post.

[0009] According to the battery cell provided by this utility model, the ratio of the area of ​​the contact surface to the area of ​​the cover plate is 30% to 70%.

[0010] According to the battery cell provided by this utility model, the cover plate is provided with a plurality of protrusions spaced apart along a first direction.

[0011] According to the battery cell provided by this utility model, a plurality of the protruding structures are evenly distributed on the cover plate along a first direction.

[0012] According to the battery cell provided by this utility model, the vertical distance between the end face of the electrode post and the port of the first housing is less than the vertical distance between the contact surface and the port of the first housing.

[0013] According to the battery cell provided by this utility model, the protruding structure is provided with a liquid injection port.

[0014] According to the battery cell provided by this utility model, the cover plate has an outer edge along the circumferential direction. The outer edge includes two first side edges arranged opposite to each other along a first direction and two second side edges arranged opposite to each other along a second direction. The first side edges and / or the second side edges are provided with abutting portions, and in the assembled state, the abutting portions abut against the port of the battery first housing.

[0015] Another aspect of this utility model provides a battery pack, including: a second housing, a battery cell, and a liquid cooling assembly.

[0016] 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 in contact with the contact surface, and the second liquid cooling plate is in contact with the bottom wall of the first housing.

[0017] The battery cell provided by this invention, by setting a protruding structure on the cover plate, 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, placing the explosion-proof valve on the bottom wall of the first housing enables thermoelectric separation, preventing the explosion-proof valve from affecting electrical connections such as the terminals when activated. Furthermore, when the battery cell provided by this invention is applied to a battery pack, liquid cooling plates can be simultaneously installed on both the side where the cover plate is located and the side where the bottom plate of the first housing is located, achieving dual-sided cooling and improving the cooling efficiency of the battery pack.

[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 1This is one of the schematic diagrams of a battery cell provided in one embodiment of this utility model.

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

[0022] Figure 3 This is one of the cross-sectional views of a battery cell provided in one embodiment of this utility model.

[0023] Figure 4 This is a second cross-sectional view of a battery cell provided in one embodiment of this utility model.

[0024] Figure 5 This is one of the schematic diagrams of the cover plate in a battery cell provided in one embodiment of this utility model.

[0025] Figure 6 This is the second schematic diagram of the cover plate in a battery cell provided in one embodiment of this utility model.

[0026] Figure 7 This is a schematic diagram of a battery cell provided in the second embodiment of this utility model.

[0027] Figure 8 This is one of the cross-sectional views of a battery cell provided in the second embodiment of this utility model.

[0028] Figure 9 This is the second cross-sectional view of a battery cell provided in the second embodiment of this utility model.

[0029] Figure 10 yes Figure 9 A magnified view of part A in the diagram.

[0030] Figure 11 This is a schematic diagram of a battery cell assembled in a battery pack according to an embodiment of the present invention.

[0031] Figure label: 100, First housing; 200, Cover plate; 210, Protruding structure; 211, Contact surface; 212, Receiving groove; 213, Liquid injection port; 220, Outer edge; 221, Abutting part; 300, Pole post; 400, Pole group; 500, Explosion-proof valve; 600, Liquid cooling assembly; 610, First liquid cooling plate; 620, Second liquid cooling plate; 700, Connecting piece. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The following is combined Figures 1 to 11 This invention describes the battery cell and battery pack provided by this utility model.

[0038] 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 plate 200. The first direction can be understood as the length direction of the cover plate 200, and the second direction can be understood as the width direction of the cover plate 200.

[0039] See Figures 1 to 6 As shown, the battery cell provided in this embodiment of the present invention includes: a first housing 100, a cover plate 200, a terminal post 300, a terminal group 400, and an explosion-proof valve 500.

[0040] A cover plate 200 is disposed on the first housing 100, and a protruding structure 210 is provided on the cover plate 200. The protruding structure 210 has a contact surface 211 that contacts the structural components of the battery pack; a pole post 300 is disposed on the cover plate 200; a pole group 400 is disposed inside the first housing 100; and an explosion-proof valve 500 is disposed on the bottom wall of the first housing 100.

[0041] The battery cell provided by this utility model, by providing a protruding structure 210 on the cover plate 200, 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 500 on the bottom wall of the first housing 100, thermal and electrical separation can be achieved, preventing the explosion-proof valve 500 from affecting electrical connections such as the terminal post 300 when activated.

[0042] Additionally, see Figure 11 As shown, when the battery cell provided by this utility model is applied to a battery pack, liquid cooling plates can be provided on both the side where the cover plate 200 is located and the side where the bottom plate of the first housing 100 is located, so as to achieve dual-sided cooling and improve the cooling efficiency of the battery pack.

[0043] Specifically, the protruding structure 210 on the cover plate 200 can be implemented in several ways. For example, the protruding structure 210 can be an independent structure / component, fixedly connected to the cover plate 200 using welding or other methods. This approach allows for more flexible design and manufacturing of the protruding structure 210, 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 210 can be integrally formed with the cover plate 200, meaning it is designed as part of the cover plate 200 during manufacturing. This reduces assembly steps, improves production efficiency, and eliminates the need for additional connectors, thus reducing potential connection strength issues and enhancing the overall integrity and stability of the cover plate 200.

[0044] The explosion-proof valve 500 is used to provide safety protection for individual battery cells. It releases pressure when the internal pressure of the battery cell abnormally increases, preventing the battery from exploding or rupturing. The explosion-proof valve 500 is located on the bottom wall of the housing, specifically in the middle of the bottom wall or on both sides of the bottom wall at a certain distance from the middle, without special limitation.

[0045] See Figure 5 and Figure 6 As shown, according to some embodiments of the present invention, the protruding structure 210 and the cover plate 200 are integrally formed.

[0046] By integrating the protruding structure 210 with the cover plate 200, the structure of the cover plate 200 can be simplified, and the integrity and compactness of the cover plate 200 can be improved.

[0047] At the same time, it can simplify the processing and manufacturing process of the cover plate 200. For example, during the stamping of the cover plate 200, the protruding structure 210 can be formed together with the cover plate 200 in one die process, making the manufacturing process of the entire cover plate 200 structure more efficient and reducing the complexity of subsequent processing and assembly. At the same time, through precise die design, the accuracy of the position and size of the protruding structure 210 can be ensured, guaranteeing the consistency of the final product quality.

[0048] See Figure 3 , Figure 4 as well as Figure 7 As shown, according to some embodiments of the present invention, the cover plate 200 has a receiving groove 212 formed on the inner side of the corresponding protrusion structure 210, which can be used to accommodate the connecting piece 700, and the connecting piece 700 is used to connect with the pole post 300.

[0049] By forming a receiving groove 212 on the inner side of the corresponding protrusion 210 in the cover plate 200, the connecting piece 700 can be accommodated in the receiving groove 212, avoiding the connecting piece 700 occupying additional space inside the first housing 100, thereby improving the space utilization rate of the battery. It should be noted that the connecting piece 700 is an electrical connector used to connect the electrode group 400 and the terminal post 300.

[0050] Of course, in addition to the connecting piece 700, the depth and dimensions of the receiving groove 212 can also be used to accommodate other components / structures (such as the tabs of the electrode group 400) inside the first battery casing 100 by controlling the depth and dimensions of the receiving groove 212, without any special limitations.

[0051] See Figure 1 As shown, according to some embodiments of the present invention, the ratio of the area of ​​the contact surface 211 to the area of ​​the cover plate 200 is 30% to 70%.

[0052] By setting the area ratio between the contact surface 211 and the cover plate 200 to 30% to 70%, it is possible to ensure that the protruding structure 210 can provide support and fixation for the battery cell, improve the stability of the battery cell in the battery pack, and improve the overall structural strength of the battery pack. At the same time, the space occupied by the protruding structure 210 is within a reasonable range, and the protruding structure 210 avoids encroaching on the installation space of components such as the terminal post 300 located on the cover plate 200.

[0053] As an example, the ratio of the area of ​​the contact surface 211 to the area of ​​the cover plate 200 can be 30%, 40%, 50%, 60%, or up to 70%. For example, when the area of ​​the contact surface 211 is 2000 mm², the total area of ​​the cover plate 200 should be at least 6666.67 mm².

[0054] See Figure 7 and Figure 8 As shown, according to some embodiments of the present invention, the cover plate 200 is provided with a plurality of protrusions 210 spaced apart along the first direction.

[0055] By providing multiple protruding structures 210 at intervals along the first direction on the cover plate 200, the supporting force can be distributed, thereby improving the overall compressive strength and stability of the cover plate 200.

[0056] It should be noted that the multiple protruding structures 210 can be adaptively arranged according to the specific configuration of the components (such as the pole post 300) on the cover plate 200. For example, the multiple protruding structures 210 can be evenly spaced along the first direction, that is, each protruding structure 210 has the same size and specifications, and the spacing between adjacent protruding structures 210 is the same; or the multiple protruding structures 210 can be non-uniformly spaced along the first direction, that is, at least some of the protruding structures 210 have different sizes and / or specifications, and / or, at least some of the adjacent protruding structures 210 have different spacing.

[0057] See Figure 7 and Figure 8 As shown, according to some embodiments of the present invention, a plurality of protruding structures 210 are evenly distributed on the cover plate 200 along the first direction.

[0058] By evenly distributing multiple protruding structures 210 along the first direction on the cover plate 200, the supporting force can be distributed more evenly, ensuring that the stress on each area of ​​the cover plate 200 is consistent during use, thereby enhancing the overall stability and compressive strength of the cover plate 200.

[0059] As an example, in this embodiment, the cover plate 200 is provided with two protruding structures 210, which are symmetrically arranged on both sides of the cover plate 200 along the first direction.

[0060] In some embodiments, if the cover plate 200 is larger in the second direction (i.e., the cover plate 200 is wider), a plurality of protrusions 210 may be provided at intervals along the second direction of the cover plate 200.

[0061] See Figure 3 As shown, according to some embodiments of the present invention, the vertical distance between the end face of the pole post 300 and the port of the first housing 100 is less than the vertical distance between the contact surface 211 and the port of the first housing 100.

[0062] By setting the vertical distance between the end face of the pole post 300 and the port of the first housing 100 to be less than the vertical distance between the contact surface 211 and the port of the first housing 100, the contact surface 211 can be located outside the end face of the pole post 300. This allows the contact surface 211 to contact the structural components of the battery pack while providing sufficient vertical installation space for the pole post 300 to prevent interference with the structural components of the battery pack.

[0063] Of course, in some embodiments, the terminal post 300 of the battery cell meets the spatial layout requirements for assembly in the battery pack, and the vertical distance between the end face of the terminal post 300 and the port of the first housing 100 can be set to be less than or equal to the vertical distance between the contact surface 211 and the port of the first housing 100.

[0064] See Figure 1 As shown, according to some embodiments of the present invention, the protruding structure 210 is provided with an injection port 213.

[0065] By placing the injection port 213 on the protruding structure 210, electrolyte can be injected into the first housing 100 using the injection port 213. At the same time, the injection port 213 does not affect the arrangement of other components on the cover plate 200 (such as the electrode post 300), thus optimizing the structural layout of the cover plate 200.

[0066] See Figures 7 to 10 As shown, according to some embodiments of the present invention, the cover plate 200 is provided with an outer edge 220 in the circumferential direction. The outer edge 220 includes two first side edges arranged opposite to each other in a first direction and two second side edges arranged opposite to each other in a second direction. The first side edges and / or the second side edges are provided with abutting portions 221, and in the assembled state, the abutting portions 221 abut against the port of the battery first housing 100.

[0067] When the contact surface 211 of the protruding structure 210 contacts the structural components of the battery pack, it applies a vertical force to the cover plate 200. By providing an abutment portion 221 on the outer edge 220 (first side edge and / or second side edge) of the cover plate 200 and engaging with the port of the first housing 100 during assembly, most of the force can be borne by the abutment portion, which can effectively avoid problems such as weld deformation or failure caused by the weld bearing the force alone.

[0068] It is understood that the abutment portion 221 may be provided only on the two oppositely arranged first side edges or the two oppositely arranged second side edges, or the abutment portion 221 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 200, and no special limitation is made in this regard.

[0069] The abutment portion 221 can adopt various structural forms, and the specific choice depends on the usage requirements and assembly process of the cover plate 200, without any special limitations. For example, a raised flange type, etc.

[0070] See Figures 7 to 10 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 221.

[0071] By providing the abutment portion 221 on the longer of the first and second side edges, the contact support force between the cover plate 200 and the port of the first housing 100 can be fully guaranteed, thereby improving structural stability.

[0072] Specifically, since the length of the first side edge is greater than the length of the second side edge, by providing the abutment portion 221 on the first side edge, the abutment contact area 211 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.

[0073] See Figures 7 to 10 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 221.

[0074] By providing abutment portions 221 on both the first and second side edges, the contact support force between the cover plate 200 and the port of the first housing 100 can be further enhanced, thereby improving structural stability.

[0075] Specifically, since both the first and second side edges are provided with abutment portions 221, they can simultaneously abut and cooperate with the ports of the first housing 100, thereby achieving a more uniform distribution of support force, which in turn enhances the contact support force between the cover plate 200 and the ports of the first housing 100, and improves structural stability.

[0076] See Figure 10 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 221 on the side facing the port of the first housing 100.

[0077] By setting the abutment portion 221 as a raised edge structure, strong support performance can be provided. Moreover, the raised edge structure is simple and easy to process and manufacture.

[0078] Specifically, in the assembled state, the side of the protrusion facing the port of the first housing 100 (i.e., the inner surface of the protrusion) contacts the port of the first housing 100, which can significantly increase the contact area 211, thereby providing stronger support performance.

[0079] The battery pack provided by this utility model is described below. The battery pack described below can be referred to in correspondence with the battery cells described above.

[0080] See Figure 11 As shown, the battery pack provided in this embodiment of the present invention includes: a second housing (not shown in the figure), a battery cell, and a liquid cooling assembly 600.

[0081] The second housing is provided with a mounting groove; the battery cell is located in the mounting groove; the liquid cooling assembly 600 includes a first liquid cooling plate 610 and a second liquid cooling plate 620, both of which are located in the second housing. The first liquid cooling plate 610 is in contact with the contact surface 211, and the second liquid cooling plate 620 is in contact with the bottom wall of the first housing 100.

[0082] In some embodiments, in order to prevent the second liquid cooling plate 620 from having a negative impact on the start-up of the explosion-proof valve 500, a clearance structure, such as a clearance port or groove, can be provided at the position of the second liquid cooling plate 620 corresponding to the explosion-proof valve 500, so that the explosion-proof valve 500 can be started normally.

[0083] 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 cell, characterized in that, include: First shell; A cover plate is disposed on the first housing, and the cover plate is provided with a protruding structure, the protruding structure having a contact surface that contacts the structural components of the battery pack; A pole post, wherein the pole post is disposed on the cover plate; A pole assembly, wherein the pole assembly is disposed within the first housing; An explosion-proof valve is disposed on the bottom wall of the first housing.

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

3. The battery cell according to claim 2, characterized in that, The cover plate has a receiving groove formed on the inner side of the protruding structure, which can be used to accommodate the connecting piece, and the connecting piece is used to connect with the pole post.

4. The battery cell according to claim 1, characterized in that, The ratio of the area of ​​the contact surface to the area of ​​the cover plate is 30% to 70%.

5. The battery cell according to claim 1, characterized in that, The cover plate is provided with a plurality of protrusions spaced apart along the first direction.

6. The battery cell according to claim 5, characterized in that, The multiple protruding structures are evenly distributed on the cover plate along the first direction.

7. The battery cell according to claim 1, characterized in that, The vertical distance between the end face of the pole and the port of the first housing is less than the vertical distance between the contact surface and the port of the first housing.

8. The battery cell according to claim 1, characterized in that, The protruding structure is provided with an injection port.

9. The battery cell according to claim 1, characterized in that, The cover plate has an outer edge along the circumferential direction. The outer edge includes two first side edges arranged opposite each other in a first direction and two second side edges arranged opposite each other in a second direction. The first side edges and / or the second side edges are provided with abutting portions, and in the assembled state, the abutting portions abut against the port of the battery first housing.

10. A battery pack, characterized in that, include: The second housing is provided with a mounting groove. ； The battery cell as described in any one of claims 1 to 9, 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 the second housing, the first liquid cooling plate being in contact with the contact surface, and the second liquid cooling plate being in contact with the bottom wall of the first housing.

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