Battery anti-rotation top cover and power battery

Abstract

The application relates to the technical field of power batteries, and discloses a battery anti-rotation top cover and a power battery, wherein the battery anti-rotation top cover comprises a composite pole, a top cover substrate and an upper plastic part, the composite pole comprises an outer pole; the upper plastic part is provided with a boss and a flange, the boss is inserted into a groove of the outer pole; the flange is inserted into a notch of the top cover substrate, a first protruding block is arranged between the groove and the groove, a second protruding block is arranged between the notch and the notch, the first protruding block and the second protruding block overlap in the up-down projection direction; in the process of assembling the battery anti-rotation top cover, the outer pole is misaligned and assembled into the top cover substrate through the groove of the outer pole and the notch of the top cover substrate, the composite pole is rotated by an angle, the first protruding block and the second protruding block overlap in the up-down projection direction, and a part of the outer pole is pressed on the top cover substrate through the upper plastic part, so that the connection stability of the outer pole and the top cover substrate can be improved. In combination with the supporting effect of the top cover substrate, the upper plastic part is not prone to deformation and loosening.

Description

Technical Field

[0001] This application relates to the field of power battery technology, such as a battery anti-rotation top cover and a power battery. Background Technology

[0002] With the development of the new energy industry, more and more lithium-ion prismatic batteries are being used in automobiles. As one of the important structural components of lithium-ion prismatic batteries, the battery top cover plays the role of carrying current and connecting different battery cells. During the connection and assembly of different battery cells, the terminals on the battery top cover need to withstand a certain degree of pressure without compromising the sealing of the battery top cover, and also need to have an anti-rotation function to ensure the safety of the battery module or battery pack assembled from the battery cells.

[0003] Existing technologies, such as CN209896164U and CN207800670U, disclose the placement of a plastic component on the upper surface of a top cover, or a plastic component below the top cover sheet, with the negative electrode post passing through the lower plastic component in sequence. The plastic component has relatively low strength and is prone to deformation or loosening under stress, potentially leading to accidents such as leakage from the battery module or battery pack.

[0004] In summary, existing technologies have the problem that plastic parts are prone to deformation or loosening when subjected to stress. Summary of the Invention

[0005] The purpose of this application is to provide a battery anti-rotation top cover and a power battery, which can solve the problem that plastic parts in the prior art are prone to deformation or loosening when subjected to force.

[0006] To achieve the above objectives, this application provides a battery anti-rotation top cover, including a composite terminal post, a top cover substrate, and an upper plastic component. The composite terminal post includes an outer terminal post. The upper plastic component is provided with a boss and a flange. The boss is inserted into a groove of the outer terminal post. The flange is inserted into a slot of the top cover substrate. A first protrusion is provided between the grooves, and a second protrusion is provided between the slots. The first and second protrusions overlap in the vertical projection direction. The outer terminal post is mounted on the top cover substrate, and the upper plastic component is mounted between the outer terminal post and the top cover substrate.

[0007] Preferably, the upper plastic part further includes an upper plastic part body, the boss is disposed on the inner ring of the upper plastic part body, and the flange is disposed on the bottom of the upper plastic part body.

[0008] Preferably, the battery anti-rotation top cover further includes a sealing ring, which abuts between the outer electrode post and the top cover substrate, and the upper edge of the sealing ring abuts against the lower side of the upper plastic part.

[0009] Preferably, the composite pole further includes a support portion; the support portion is connected to the outer pole by friction welding, or the support portion and the outer pole are integrally formed.

[0010] Preferably, the battery anti-rotation top cover further includes a lower plastic component disposed between the support portion and the top cover substrate.

[0011] Preferably, the top cover substrate further includes a substrate body, the substrate body having a first through hole, and the slot being provided on the sidewall of the first through hole.

[0012] Preferably, the lower plastic part has a second through hole, and the outer pole extends out from the second through hole.

[0013] Preferably, the outer pole is formed by machining on a lathe.

[0014] Preferably, the groove of the outer pole is formed by knurling.

[0015] This application also provides a power battery, including the aforementioned anti-rotation top cover, and further including a battery cell connected to the anti-rotation top cover.

[0016] This application discloses a battery anti-rotation top cover, comprising a composite terminal post, a top cover substrate, and an upper plastic component. The composite terminal post includes an outer terminal post. The upper plastic component is provided with a boss and a flange. The boss is inserted into a groove of the outer terminal post. The flange is inserted into a slot of the top cover substrate. A first protrusion is provided between the grooves, and a second protrusion is provided between the slots. The first and second protrusions overlap in the vertical projection direction. The top cover substrate is used to mount the outer terminal post, and the upper plastic component is used to enhance the connection stability between the outer terminal post and the top cover substrate. During the assembly of the battery anti-rotation top cover, the outer terminal post is misaligned and inserted into the top cover substrate through the groove of the outer terminal post and the slot of the top cover substrate. By rotating the angle of the composite terminal post, the first protrusion of the outer terminal post overlaps with the second protrusion of the top cover substrate in the vertical projection direction. A portion of the outer terminal post presses against the top cover substrate through the upper plastic component, which can enhance the connection stability between the outer terminal post and the top cover substrate. Combined with the supporting function of the top cover substrate, the upper plastic parts are not prone to deformation or loosening. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the disassembled state of a battery anti-rotation top cover according to an embodiment.

[0018] Figure 2 This is a schematic diagram of the installation state of a battery anti-rotation top cover according to one embodiment;

[0019] Figure 3 A top view of a battery anti-rotation top cover according to one embodiment;

[0020] Figure 4 for Figure 3 A schematic diagram of the cross-section along the AA direction;

[0021] Figure 5 for Figure 4 A magnified view of a section at point B in the middle;

[0022] Figure 6 This is a schematic diagram of the structure of the upper plastic part according to one embodiment;

[0023] Figure 7 This is a schematic diagram of the structure of the outer pole post in one embodiment;

[0024] Figure 8 This is a schematic diagram of the structure of a composite pole according to one embodiment;

[0025] Figure 9 This is a schematic diagram of the top cover substrate of one embodiment.

[0026] Among them, 1. Upper plastic part; 11. Boss; 12. Flange; 13. Upper plastic part body; 2. Top cover substrate; 21. Groove; 22. Substrate body; 23. Second boss; 3. Sealing ring; 4. Lower plastic part; 5. Composite pole; 51. Support part; 52. Outer pole; 521. Groove; 522. First boss.

[0027] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In one embodiment, refer to Figures 1-9 The battery anti-rotation top cover includes a composite terminal post 5, a top cover substrate 2, and an upper plastic part 1. The composite terminal post 5 includes an outer terminal post 52. The upper plastic part 1 is provided with a boss 11 and a flange 12. The boss 11 is inserted into the groove 521 of the outer terminal post 52. The flange 12 is inserted into the slot 21 of the top cover substrate 2. A first protrusion 522 is provided between the grooves 521 and a second protrusion 23 is provided between the slots 21. The first protrusion 522 and the second protrusion 23 overlap in the vertical projection direction. The outer terminal post 52 is mounted on the top cover substrate 2, and the upper plastic part 1 is mounted between the outer terminal post 52 and the top cover substrate 2.

[0033] The composite pole 5 further includes a support portion 51, which is connected to the outer pole 52 by friction welding. Preferably, the outer pole 52 is machined on a lathe. In another embodiment, the support portion 51 and the outer pole 52 are integrally formed.

[0034] The outer pole post 52 can be located in the middle of the support portion 51 or in other positions on the support portion 51, which is not limited here. The support portion 51 can be a rectangular plate, a circular plate or a square plate, which is not limited here. In this embodiment, the support portion 51 is a rectangular plate as an example.

[0035] The support part 51 serves to fix the outer pole post 52. The height of the outer pole post 52 can be set to a fixed value, or it can be set to be height adjustable; there is no limitation here.

[0036] The top cover substrate 2 is rectangular in shape, but it can also be other shapes, which are not limited here. In this embodiment, the top cover substrate 2 is rectangular as an example. The length of the top cover substrate 2 is greater than the length of the support portion 51, and the width of the top cover substrate 2 can be greater than the width of the support portion 51 or equal to the width of the support portion 51. The top cover substrate 2 is disposed parallel to the top of the support portion 51.

[0037] During assembly, the groove 521 of the outer pole post 52 is misaligned and inserted into the slot 21 of the top cover substrate 2. The composite pole post 5 is rotated, thereby changing the angle of the outer pole post 52, so that the first protrusion 522 of the outer pole post 52 and the second protrusion 23 of the top cover substrate 2 overlap in the vertical projection direction, enhancing the connection stability between the outer pole post 52 and the top cover substrate 2. Preferably, the groove 521 of the outer pole post 52 is formed by knurling.

[0038] A portion of the outer electrode post 52 is pressed against the top cover substrate 2 through the upper plastic component 1. The upper plastic component 1 enhances the connection stability between the outer electrode post 52 and the top cover substrate 2. In addition, due to the supporting effect of the top cover substrate 2, the upper plastic component 1 is less prone to deformation or loosening, which further ensures the connection stability between the composite electrode post 5 and the top cover substrate 2.

[0039] An anti-rotation top cover according to an embodiment of this application includes a composite terminal post 5, a top cover substrate 2, and an upper plastic part 1. The composite terminal post 5 includes an outer terminal post 52. The upper plastic part 1 is provided with a boss 11 and a flange 12. The boss 11 is inserted into a groove 521 of the outer terminal post 52. The flange 12 is inserted into a slot 21 of the top cover substrate 2. A first protrusion 522 is provided between the grooves 521 and a second protrusion 23 is provided between the slots 21. The first protrusion 522 and the second protrusion 23 overlap in the vertical projection direction. The top cover substrate 2 is used to mount the outer terminal post 52, and the upper plastic part 1 is used to enhance the connection stability between the outer terminal post 52 and the top cover substrate 2. During the assembly of the battery anti-rotation top cover, the outer electrode 52 is misaligned and inserted into the top cover substrate 2 through the groove 521 of the outer electrode 52 and the slot 21 of the top cover substrate 2. The angle of the composite electrode 5 is rotated so that the first protrusion 522 of the outer electrode 52 and the second protrusion 23 of the top cover substrate 2 overlap in the vertical projection direction. A part of the outer electrode 52 presses against the top cover substrate 2 through the upper plastic part 1, which can enhance the connection stability between the outer electrode 52 and the top cover substrate 2. Combined with the supporting role of the top cover substrate 2, the upper plastic part 1 is not easy to deform or loosen.

[0040] In one embodiment, refer to Figures 6-7 The upper plastic part 1 also includes an upper plastic part body 13, the boss 11 is disposed on the inner ring of the upper plastic part body 13, and the flange 12 is disposed on the bottom of the upper plastic part body 13.

[0041] The upper plastic body 13 is annular, and a plurality of protrusions 11 are spaced apart on the inner ring of the upper plastic body 13. The number of protrusions 11 can be 6 or other values. In this embodiment, the number of protrusions 11 is 6. The protrusions 11 are used to cooperate with the grooves 521 of the outer electrode post 52 to prevent the battery anti-rotation top cover from rotating.

[0042] The bottom edge of the upper plastic body 13 is provided with a plurality of flanges 12 at intervals. The number of flanges 12 may be the same as the number of bosses 11 or may not be the same as the number of bosses 11. This is not limited here.

[0043] As described above, the upper plastic part 1 also includes an upper plastic part body 13, with a boss 11 disposed on the inner ring of the upper plastic part body 13 and a flange 12 disposed on the bottom of the upper plastic part body 13. The boss 11 is used to cooperate with the groove 521 of the outer electrode post 52 to prevent the battery anti-rotation top cover from rotating.

[0044] In one embodiment, refer to Figure 1 and Figure 5 The battery anti-rotation top cover also includes a sealing ring 3, which abuts between the outer electrode post 52 and the top cover substrate 2, and the upper edge of the sealing ring 3 abuts against the lower side of the upper plastic part 1.

[0045] The sealing ring 3 is fitted onto the outer electrode post 52, abutting between the upper surface of the outer electrode post 52 and the lower surface of the top cover substrate 2. This provides insulation between the composite electrode post 5 and the top cover substrate 2, and also seals the internal space of the battery. In other embodiments, the sealing ring 3 can also abut between the side of the outer electrode post 52 and the side of the top cover substrate 2, as long as it ensures insulation between the composite electrode post 5 and the top cover substrate 2, and seals the internal space of the battery.

[0046] The battery anti-rotation top cover also includes a lower plastic part 4 disposed between the sealing ring 3 and the composite terminal post 5.

[0047] A second through hole is provided in the middle or at another location of the lower plastic part 4, through which the outer pole 52 extends. The radius of the second through hole is the same as the outer radius of the upper plastic part body 13. The centers of the outer pole 52, the support part 51, the top cover substrate 2, the sealing ring 3, the lower plastic part 4, and the upper plastic part 1 are located on the same axis. The outer pole 52 can pass through the second through hole of the lower plastic part 4.

[0048] During the assembly of the battery anti-rotation top cover, the top cover substrate 2, sealing ring 3, lower plastic part 4, and composite terminal 5 are first assembled together. As an example, the composite terminal 5 is first passed through the second through hole on the lower plastic part 4. Then, the sealing ring 3 is fitted onto the outer terminal 52, and the composite terminal 5 is pushed upwards until the sealing ring 3 tightly abuts against the upper surface of the outer terminal 52 and the lower surface of the top cover substrate 2, thus connecting the composite terminal 5 and the top cover substrate 2 together, resulting in an intermediate assembly structure. The above assembly sequence can be used, or other assembly sequences can be used; no limitation is made here.

[0049] The intermediate assembly structure is placed in an injection mold, and the upper plastic part 1 is injection molded using an injection molding machine to connect and insulate the top cover substrate 2 and the composite terminal 5, thus obtaining the battery anti-rotation top cover. Compared to the traditional riveted battery top cover, the battery anti-rotation top cover assembled in this way reduces the number of parts and simplifies the assembly process. Since there is no need to set positioning holes on the top cover substrate 2, a thinner top cover substrate 2 can be used, reducing the assembly cost of the battery top cover and increasing the internal space of the battery cell.

[0050] As described above, the battery anti-rotation top cover also includes a sealing ring 3, which abuts against the outer electrode post 52 and the top cover substrate 2 to provide insulation between the composite electrode post 5 and the top cover substrate 2. The sealing ring 3 also seals the internal space of the battery. The battery anti-rotation top cover also includes a lower plastic part 4 disposed between the sealing ring 3 and the composite electrode post 5. The outer electrode post 52 can pass through the second through hole of the lower plastic part 4.

[0051] In one embodiment, refer to Figure 6 , Figure 7 and Figure 9 The top cover substrate 2 also includes a substrate body 22, which has a first through hole and a slot 21 is provided on the side wall of the first through hole.

[0052] The first through hole can be located at the center of the substrate body 22 or at other locations on the substrate body 22; no limitation is made here. In this embodiment, the first through hole is located at the center of the substrate body 22. The first through hole, the second through hole, and the outer ring of the upper plastic part 1 have the same radius.

[0053] The sidewall of the first through hole is provided with a plurality of slots 21 at intervals. The number of slots 21 is the same as the number of grooves 521 of the outer pole post 52. The slots 21 are used to mate with the flange 12 of the upper plastic part 1.

[0054] As described above, the top cover substrate 2 also includes a substrate body 22, which has a first through hole, and the sidewall of the first through hole is provided with the slot 21. The number of slots 21 is the same as the number of grooves 521 of the outer pole post 52, and the slots 21 are used to cooperate with the flange 12 of the upper plastic part 1.

[0055] In one embodiment, the power battery includes the aforementioned anti-rotation top cover and also includes battery cells connected to the anti-rotation top cover.

[0056] The battery anti-rotation top cover is used for carrying current and connecting different battery cells. The battery anti-rotation top cover has an anti-rotation function to ensure the safety of the modules or battery packs assembled from the battery cells.

[0057] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An assembly process for a battery anti-rotation top cover, characterized in that, The device includes a composite electrode post, a top cover substrate, and an upper plastic component. The composite electrode post includes an outer electrode post. The upper plastic component has a boss and a flange. The boss is inserted into a groove of the outer electrode post. The flange is inserted into a slot of the top cover substrate. A first protrusion is provided between the grooves, and a second protrusion is provided between the slots. The first and second protrusions overlap in the vertical projection direction. During the assembly of the battery anti-rotation top cover, the outer electrode post is misaligned and installed into the top cover substrate through the groove of the outer electrode post and the slot of the top cover substrate. The angle of the composite electrode post is rotated so that the first and second protrusions overlap in the vertical projection direction. The outer electrode post is mounted on the top cover substrate, and the upper plastic component is mounted between the outer electrode post and the top cover substrate.

2. The assembly process of the battery anti-rotation top cover according to claim 1, characterized in that, The upper plastic part also includes an upper plastic part body, the boss is disposed on the inner ring of the upper plastic part body, and the flange is disposed on the bottom of the upper plastic part body.

3. The assembly process of the battery anti-rotation top cover according to claim 1, characterized in that, It also includes a sealing ring, which abuts between the outer pole and the top cover substrate, and the upper edge of the sealing ring abuts against the lower side of the upper plastic part.

4. The assembly process of the battery anti-rotation top cover according to claim 1, characterized in that, The composite pole also includes a support portion; the support portion is connected to the outer pole by friction welding, or the support portion and the outer pole are integrally formed.

5. The assembly process of the battery anti-rotation top cover according to claim 4, characterized in that, It also includes a lower plastic component disposed between the support portion and the top cover substrate.

6. The assembly process of the battery anti-rotation top cover according to claim 1, characterized in that, The top cover substrate also includes a substrate body, the substrate body having a first through hole, and the slot being provided on the sidewall of the first through hole.

7. The assembly process of the battery anti-rotation top cover according to claim 5, characterized in that, The lower plastic part has a second through hole, and the outer pole extends out from the second through hole.

8. The assembly process of the battery anti-rotation top cover according to claim 1, characterized in that, The outer pole is machined using a lathe.

9. The assembly process of the battery anti-rotation top cover according to claim 1, characterized in that, The grooves on the outer pole are formed by knurling.

10. A battery anti-rotation top cover, characterized in that, It is prepared based on the assembly process of the battery anti-rotation top cover according to any one of claims 1-9.

11. A power battery, characterized in that, The battery anti-rotation top cover as described in claim 10 also includes a battery cell connected to the battery anti-rotation top cover.

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