Power battery top cover

Abstract

The utility model discloses a power battery top cover which comprises a light aluminum plate, a lower plastic plate, a negative pole and a positive pole, the light aluminum plate and the lower plastic plate are fixed through a first fixing piece, and the negative pole and the positive pole penetrate through the light aluminum plate and the lower plastic plate. The negative pole post and the positive pole post are fixed on a lower plastic plate through a second fixing piece, a third groove is formed in the lower plastic plate, the second fixing piece comprises a pair of sealing rings matched with the negative pole post and the positive pole post, the pair of sealing rings are connected to the negative pole post and the positive pole post in a sleeving mode respectively, and a third groove is formed in the lower plastic plate. A second groove is formed in the smooth aluminum plate, and an anti-explosion valve is welded to the end face, located at the bottom of the second groove, of the smooth aluminum plate. According to the utility model, the negative upper plastic cement and the positive upper plastic cement are not easy to loosen when being fixed, so that the negative pole and the positive pole are connected with the optical aluminum plate and the lower plastic cement plate more stably and are not easy to fall off.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a power battery top cover. Background Art

[0002] The power batteries of new energy vehicles generally adopt a square hard shell structure. The power battery housing includes a housing and a top cover assembly. The power battery housing provides a sealed space to accommodate the electrode assembly and the electrolyte. The electric energy of the electrode assembly is led out of the sealed space to the outside of the sealed space through the pole columns of the top cover assembly.

[0003] Since the electrode columns of the battery need to be connected to external power lines, the current conventional connection method is generally to fix the power line on them by means of screw fixation. However, during the fixation process, the electrode columns need to be subjected to rotational force. When the electrode columns are fixed on the battery substrate, generally, the plastic is used to fix the electrode columns by means of overmolding. And the electrode columns are generally circular, which makes it easy for them to loosen or even fall off from the plastic parts after being stressed.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a power battery top cover.

[0005] The information disclosed in this background art section is only for increasing the understanding of the overall background of the utility model, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a power battery top cover, which can make it not easy to loosen when fixing the plastics on the negative electrode and the positive electrode, and achieve a more stable connection and not easy to fall off between the negative electrode pole column and the positive electrode pole column and the light aluminum plate and the lower plastic plate.

[0007] To achieve the above purpose, a specific embodiment of the utility model provides a power battery top cover, which includes a light aluminum plate, a lower plastic plate, a negative electrode pole column and a positive electrode pole column. The light aluminum plate and the lower plastic plate are fixed by a first fixing member. The negative electrode pole column and the positive electrode pole column penetrate through the light aluminum plate and the lower plastic plate, and the negative electrode pole column and the positive electrode pole column are fixed on the lower plastic plate by a second fixing member.

[0008] In one or more embodiments of the utility model, a third groove is formed on the lower plastic plate. The second fixing member includes a pair of sealing rings that match the negative electrode pole column and the positive electrode pole column, and the pair of sealing rings are respectively sleeved on the negative electrode pole column and the positive electrode pole column.

[0009] In one or more embodiments of the utility model, a second groove is formed on the light aluminum plate, and an explosion-proof valve is welded to the bottom end face of the light aluminum plate located in the second groove.

[0010] In one or more embodiments of the present utility model, an explosion-proof valve patch is fixedly connected to the top end face of the light aluminum plate located in the second groove, and the explosion-proof valve patch is connected to an explosion-proof valve.

[0011] In one or more embodiments of the present utility model, a second annular column is fixedly connected to the outer end face of the positive electrode terminal post. A first annular column is fixedly connected to the upper end face of the positive electrode terminal post located in the second annular column. Fixed rings are fixedly connected to the inner end faces of the inner walls of the negative upper plastic and the positive upper plastic, and the fixed rings are clamped between the first annular column and the second annular column.

[0012] In one or more embodiments of the present utility model, the first fixing member includes the negative upper plastic and the positive upper plastic. A first groove matching the negative upper plastic and the positive upper plastic is formed in the light aluminum plate, and the negative electrode terminal post and the positive electrode terminal post penetrate through the first groove and are connected to the negative upper plastic and the positive upper plastic.

[0013] In one or more embodiments of the present utility model, a plurality of limiting holes are formed in both the light aluminum plate and the lower plastic plate.

[0014] In one or more embodiments of the present utility model, a plurality of limiting grooves are formed in the end faces of the light aluminum plate located at a pair of first grooves, and the bottoms of the negative upper plastic and the positive upper plastic are embedded in the inner end faces of the limiting grooves.

[0015] In one or more embodiments of the present utility model, the plurality of limiting grooves gradually decrease from top to bottom, and the projection of the first groove on the horizontal plane is larger than the projection of the negative electrode terminal post or the positive electrode terminal post on the horizontal plane.

[0016] In one or more embodiments of the present utility model, first threaded holes are formed in both the negative electrode terminal post and the positive electrode terminal post.

[0017] Compared with the prior art, a battery power supply top cover of the present utility model realizes that the negative upper plastic and the positive upper plastic are not easily loosened when being fixed, and achieves a more stable connection and not easily falling off between the negative electrode terminal post and the positive electrode terminal post and the light aluminum plate and the lower plastic plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1Schematic diagram of the structure of a power battery top cover in an embodiment of the present utility model;

[0020] Figure 2 Exploded view of the structure of a power battery top cover in an embodiment of the present utility model;

[0021] Figure 3 Combined state diagram of the structure of a power battery top cover in an embodiment of the present utility model;

[0022] Figure 4 Schematic diagram of the structure of a positive electrode terminal in an embodiment of the present utility model.

[0023] Main reference numeral description:

[0024] 1 - Upper plastic of negative electrode, fixing ring 101 - Fixing ring, 2 - Light aluminum plate, 201 - First groove, 202 - Limiting groove, 203 - Second groove, 3 - Sealing ring, 4 - Negative electrode terminal, 5 - Lower plastic plate, 501 - Third groove, 6 - Explosion-proof valve, 7 - Explosion-proof valve patch, 8 - Upper plastic of positive electrode, 9 - Positive electrode terminal, 901 - First annular column, 902 - Second annular column, 10 - Positive electrode connecting piece, 11 - Negative electrode connecting piece, 12 - Sealing glue nail, 13 - Sealing aluminum nail, 14 - Formation glue nail, 15 - Battery cell. Detailed implementation manners

[0025] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0026] As Figures 1 to 2 shown, a power battery top cover in an embodiment of the present utility model includes a light aluminum plate 2, a lower plastic plate 5, a negative electrode terminal 4 and a positive electrode terminal 9. The light aluminum plate 2 and the lower plastic plate 5 are fixed by a first fixing member. The negative electrode terminal 4 and the positive electrode terminal 9 penetrate through the light aluminum plate 2 and the lower plastic plate 5, and the negative electrode terminal 4 and the positive electrode terminal 9 are fixed on the lower plastic plate 5 by a second fixing member.

[0027] A second groove 203 is formed on the light aluminum plate 2, and an explosion-proof valve 6 is welded to the bottom end face of the light aluminum plate 2 at the second groove 203. Among them, the explosion-proof valve 6 can rupture and exhaust gas in time under the air pressure of 0.6 ± 0.2 MPa. There is no micro air leakage phenomenon before blasting.

[0028] Further, an explosion-proof valve patch 7 is fixedly connected to the top end face of the light aluminum plate 2 located in the second groove 203, and the explosion-proof valve patch 7 is connected to the explosion-proof valve 6.

[0029] A third groove 501 is formed in the lower plastic plate 5. The second fixing member includes a pair of sealing rings 3 that match the negative electrode terminal 4 and the positive electrode terminal 9. The pair of sealing rings 3 are respectively sleeved on the negative electrode terminal 4 and the positive electrode terminal 9. After the pair of sealing rings 3 are sleeved, the negative electrode terminal 4 and the positive electrode terminal 9 penetrate through the third groove 501 and the first groove 201.

[0030] The first fixing member includes a negative upper plastic 1 and a positive upper plastic 8. A first groove 201 that matches the negative upper plastic 1 and the positive upper plastic 8 is formed in the light aluminum plate 2. The negative electrode terminal 4 and the positive electrode terminal 9 penetrate through the first groove 201 and are connected to the negative upper plastic 1 and the positive upper plastic 8.

[0031] Here, it should be noted that the negative upper plastic 1 and the positive upper plastic 8 wrap and fix the negative electrode terminal 4 and the positive electrode terminal 9 on the light aluminum plate 2 by means of injection molding with encapsulation.

[0032] It should be noted that there is a certain gap between the first groove 201 and the negative electrode terminal 4 or the positive electrode terminal 9, that is, the projection of the first groove 201 on the horizontal plane is larger than the projection of the negative electrode terminal 4 or the positive electrode terminal 9 on the horizontal plane. Thus, after the negative upper plastic 1 and the positive upper plastic 8 are embedded and fixed, they can be more stable.

[0033] Further, a plurality of limiting grooves 202 are formed in the end faces of the light aluminum plate 2 located at a pair of first grooves 201, and the bottoms of the negative upper plastic 1 and the positive upper plastic 8 are embedded in the inner end faces of the limiting grooves 202. That is, after the negative upper plastic 1 and the positive upper plastic 8 are injection molded with encapsulation, their bottoms are embedded in the limiting grooves 202. By providing the limiting grooves 202, when the negative electrode terminal 4 or the positive electrode terminal 9 is subjected to a rotational force, it can be more stable. The limiting grooves 202 can share part of the rotational force, making the connection between the negative upper plastic 1 and the positive upper plastic 8 and the light aluminum plate 2 more stable and preventing detachment.

[0034] The number of the plurality of limiting grooves 202 decreases sequentially from top to bottom. After the negative upper plastic 1 and the positive upper plastic 8 are injection molded and formed, longitudinal detachment and loosening can be restricted, and the negative electrode terminal 4 or the positive electrode terminal 9 can be more stable.

[0035] Preferably, first threaded holes are formed in both the negative electrode terminal 4 and the positive electrode terminal 9, and the external power line is fixed thereto by means of screwing bolts. Of course, threads can also be provided on the outside and fixed by means of nuts.

[0036] Furthermore, a first annular column 901 is fixedly connected to the upper end face of the second annular column 902 where the positive electrode terminal 9 is located. A first annular column 901 is fixedly connected to the upper end face of the second annular column 902 where the positive electrode terminal 9 is located. Fixed rings 101 are fixedly connected to the inner wall end faces of the negative upper plastic 1 and the positive upper plastic 8, and the fixed rings 101 are clamped between the first annular column 901 and the second annular column 902.

[0037] Further, when the negative upper plastic 1 and the positive upper plastic 8 wrap and fix the negative electrode terminal 4 and the positive electrode terminal 9 on the light aluminum plate 2 by means of overmolding, when some of the negative electrode terminals 4 or positive electrode terminals 9 are connected to the external power supply line, they are fixed by means of nuts. In this way, when rotating, after the negative electrode terminal 4 or the positive electrode terminal 9 is subjected to the rotational force, it is easy to fall off from the negative upper plastic 1 or the positive upper plastic 8, causing the negative electrode terminal 4 or the positive electrode terminal 9 to become loose. However, after the first annular column 901 and the second annular column 902 are arranged on the outside of the negative electrode terminal 4 or the positive electrode terminal 9, after the negative upper plastic 1 and the positive upper plastic 8 are overmolded, the interiors of the negative upper plastic 1 and the positive upper plastic 8 will be embedded between the first annular column 901 and the second annular column 902, which will be more stable and prevent the negative electrode terminal 4 or the positive electrode terminal 9 from becoming loose when the external power supply line is connected to the negative electrode terminal 4 or the positive electrode terminal 9.

[0038] Negative connection pieces 11 and positive connection pieces 10 are fixedly connected to the bottom end faces of the negative electrode terminal 4 and the positive electrode terminal 9, and the negative connection pieces 11 and the positive connection pieces 10 are fixedly connected to the lower plastic plate 5.

[0039] A plurality of limiting holes are provided on both the light aluminum plate 2 and the lower plastic plate 5. Sealing aluminum nails 13 and sealing glue nails 12 are respectively fixedly connected in the plurality of limiting holes of the light aluminum plate 2 and the lower plastic plate 5, so as to seal and fix the lower plastic plate 5 and the light aluminum plate 2 through the sealing glue nails 12 and the sealing aluminum nails 13. Then, the battery formation is carried out through the formation glue nails 14.

[0040] It should be noted here that, at the initial stage when leaving the factory, the negative connection pieces 11, the positive connection pieces 10, the sealing glue nails 12, the sealing aluminum nails 13, and the formation glue nails 14 are not fixed. After the positive electrode terminal 9 and the positive connection piece 10 are fixed to the battery cell 15 first, then the sealing glue nails 12 are hermetically sealed, and then the light aluminum plate 2 and the lower plastic plate 5 are fixed by welding through the sealing aluminum nails 13. The formation glue nails 14 are mainly used for the final battery formation.

[0041] When assembling, first weld the explosion-proof valve 6 to the bottom of the second groove 203 of the light aluminum plate 2, then weld the explosion-proof valve patch 7 to the top of the second groove 203 of the light aluminum plate 2. Then, string a pair of sealing rings 3 on the negative pole column 4 and the positive pole column 9, and then pass the negative pole column 4 and the positive pole column 9 through the third groove 501 and the first groove 201. Then, use the negative upper plastic 1 and the positive upper plastic 8 to fix the negative pole column 4 and the positive pole column 9 on the light aluminum plate 2 by means of encapsulation injection molding. Then, connect the negative pole column 4 and the positive pole column 9 with the negative connection piece 11, the positive connection piece 10, and the battery cell 15. After the whole assembly is completed, then operate the sealant nail 12 and the seal aluminum nail 13 in sequence to fix and seal the whole.

[0042] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be regarded as limiting the claimed invention.

[0043] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A power battery top cover, characterized in that: It includes a plain aluminum plate, a lower plastic plate, a negative pole and a positive pole, wherein the plain aluminum plate and the lower plastic plate are fixed by a first fixing member, the negative pole and the positive pole penetrate the plain aluminum plate and the lower plastic plate, and the negative pole and the positive pole are fixed to the lower plastic plate by a second fixing member; The outer end face of the positive pole is fixedly connected to the second annular column, the upper end face of the positive pole located on the second annular column is fixedly connected to the first annular column, the inner wall end faces of the plastic on the negative pole and the plastic on the positive pole are fixedly connected to fixing rings, and the fixing rings are clamped between the first annular column and the second annular column.

2. A power battery top cover according to claim 1, characterized in that: The lower plastic plate is provided with a third groove, and the second fixing member includes a pair of sealing rings matching the negative electrode column and the positive electrode column, and the pair of sealing rings are respectively sleeved on the negative electrode column and the positive electrode column.

3. A power battery top cover according to claim 2, characterized in that: A second groove is provided on the plain aluminum plate, and an explosion-proof valve is welded on the bottom end surface of the plain aluminum plate located in the second groove.

4. A power battery top cover according to claim 3, characterized in that: The top end surface of the bare aluminum plate located in the second groove is fixedly connected with an explosion-proof valve patch, and the explosion-proof valve patch is connected to the explosion-proof valve.

5. A power battery top cover according to claim 4, characterized in that: The first fixing member includes negative electrode plastic and positive electrode plastic, the plain aluminum plate is provided with a first groove matching the negative electrode plastic and the positive electrode plastic, and the negative electrode column and the positive electrode column pass through the first groove and are connected with the negative electrode plastic and the positive electrode plastic.

6. A power battery top cover according to claim 1 or 5, characterized in that: The bare aluminum plate and the lower plastic plate are both provided with a plurality of limiting holes.

7. A power battery top cover according to claim 6, characterized in that: The end surfaces of the bare aluminum plate located at a pair of first grooves are each provided with a plurality of limiting grooves, and the bottoms of the plastic on the negative electrode and the plastic on the positive electrode are embedded in the inner end surfaces of the limiting grooves.

8. A power battery top cover according to claim 7, characterized in that: The plurality of limit grooves decrease in number from top to bottom, and the projection of the first groove on the horizontal plane is larger than the projection of the negative pole or the positive pole on the horizontal plane.

9. A power battery top cover according to claim 1, characterized in that: The negative electrode post and the positive electrode post are both provided with a first threaded hole.

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