Battery top cover, battery cell and vehicle

Abstract

The utility model discloses a battery top cover, a battery cell and a vehicle, the battery top cover comprises a light aluminum sheet, and the light aluminum sheet is provided with a first through hole; the pole comprises a pole main body and a cylindrical boss arranged on one axial side of the pole main body; the clamping ring comprises a circular-ring-shaped clamping ring body and a clamping ring sleeve extending in a protruding mode at the position of the inner cavity wall of the clamping ring body, and the free end section of the clamping ring sleeve is constructed to be a necking-down section gradually extending towards the radial inner side of the clamping ring sleeve; wherein the boss and the snap ring sleeve oppositely extend in the first through hole, the boss is sleeved in the inner wall of the snap ring sleeve, a riveting groove formed in the outer wall of the boss is clamped with the necking section in a riveting manner, and the pole main body and the snap ring main body are arranged on two sides of the polished aluminum sheet in a clamping manner. And the position of the pole relative to the aluminum sheet is fixed by the clamping ring, so that laser welding is avoided, the over-current capability of the pole is improved, and the process is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to a battery top cover, a battery core and a vehicle. Background Art

[0002] With the development of energy vehicles, battery technology is also constantly improving. The battery cover is part of the battery structure, which plays the role of transmitting energy, carrying electrolyte, protecting safety, fixing and supporting batteries, and appearance decoration. The quality and performance of the battery cover directly affect the safety and service life of the entire battery unit.

[0003] In the prior art, during the production of the battery top cover, after the aluminum block is riveted onto the pole, laser welding is required between the aluminum block and the axial end face of the pole. It can be seen that the connection between the pole aluminum block and the pole is completed through two processes, riveting and laser welding. There are many processing steps and the cost is high. At the same time, during the charging and discharging process, the current needs to pass through the laser weld mark between the pole aluminum block and the pole, which will cause a large heat generation at the weld mark and affect the current carrying capacity.

[0004] Therefore, it is necessary to design a battery top cover, a battery cell and a vehicle to improve the current flow capacity between the pole aluminum block and the pole. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a battery top cover, a battery cell and a vehicle. In the battery top cover, the connection between the pole and the bare aluminum sheet is not achieved by laser welding, but the connection relationship between the two parts on the original overcurrent path is optimized, thereby improving the overcurrent capacity of the pole. At the same time, in the pole assembly process, the laser welding process is eliminated, the pole assembly process is simplified, and the pole assembly cost is reduced.

[0006] According to a first aspect of the utility model, a battery top cover is provided, comprising:

[0007] A plain aluminum sheet, wherein a first through hole is provided on the plain aluminum sheet,

[0008] The pole comprises a columnar pole body and a cylindrical boss arranged on one axial side of the pole body.

[0009] The snap ring comprises a circular snap ring body and a snap ring sleeve extending protrudingly from the inner cavity wall of the snap ring body, wherein the free end section of the snap ring sleeve is configured as a necking section gradually extending radially inwardly of the snap ring sleeve.

[0010] Among them, the boss and the retaining ring sleeve extend relatively to each other in the first through hole, the boss is sleeved into the inner wall of the retaining ring sleeve, and the rivet groove formed on the outer wall of the boss is riveted and clamped with the shrinking section, and the pole body and the retaining ring body are clamped on both sides of the bare aluminum sheet.

[0011] In one embodiment, it also includes a sealing ring (120) that is sleeved on the outer wall of the boss, the sealing ring includes a sealing ring body and a thinning ring portion that abuts against the inner wall of the sealing ring body, the sealing ring body is arranged between the pole body and the bare aluminum sheet, and the thinning ring portion is arranged between the pole body and the clamping ring sleeve.

[0012] In one embodiment, it also includes a lower plastic part arranged between the bare aluminum sheet and the retaining ring body, the lower plastic part is provided with a second through hole opposite to the first through hole, a lower plastic part spacer is protrudingly provided on the inner wall of the second through hole, the lower plastic part spacer is located between the retaining ring sleeve and the inner wall of the first through hole and extends between the sealing ring body and the retaining ring sleeve.

[0013] In one embodiment, the inner peripheral wall of the sealing ring main body is configured as an inclined surface facing the clamping ring main body, and the outer peripheral wall of the lower plastic part spacer matches the inner peripheral wall of the sealing ring main body.

[0014] In one embodiment, it also includes an upper plastic part, which includes a plate-shaped upper plastic part body and an upper plastic sleeve protrudingly extending from the peripheral outer wall of the upper plastic part body, and a third through hole is provided on the upper plastic part body, and the third through hole is sleeved on the peripheral wall of the sealing ring body. The upper plastic part body is located between the pole body and the bare aluminum sheet, and the upper plastic sleeve is sleeved on part of the peripheral outer wall of the pole body.

[0015] In one embodiment, a first recessed groove is provided on the bare aluminum sheet, which is located outside the first through hole and protrudes and extends in the direction of the clamp body, the upper plastic sleeve and part of the pole body are embedded in the first recessed groove, and a second recessed groove for matching and accommodating the first recessed groove is provided on the lower plastic part.

[0016] In one embodiment, two first through holes are arranged on the bare aluminum sheet, and the poles include a positive pole and a negative pole which are respectively connected to the first through holes in a corresponding manner.

[0017] In one embodiment, a weight-reducing groove is provided on a side surface of the pole body away from the clamp ring body.

[0018] According to a second aspect of the utility model, a battery cell is provided, comprising the above-mentioned battery top cover.

[0019] According to a third aspect of the utility model, a vehicle is provided, comprising the above-mentioned battery cell.

[0020] The above technical solution has the following beneficial effects: by adding a clamping ring, and the clamping ring sleeve of the clamping ring and the boss of the pole are riveted in the first through hole of the plain aluminum sheet, so that during the installation of the pole, the boss of the pole is inserted into the first through hole of the plain aluminum sheet and riveted and fixed with the clamping ring inserted into the first through hole, and at the same time, the pole body of the pole and the clamping ring body of the clamping ring are clamped on both sides of the plain aluminum sheet, thereby limiting the position of the pole relative to the plain aluminum sheet and connecting and fixing the pole to the plain aluminum sheet. This setting can avoid the use of laser welding to connect the plain aluminum sheet and the pole, thereby improving the current capacity of the pole, simplifying the process, and reducing the processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0022] Figure 1 An exploded view of a battery top cover according to an embodiment of the utility model is shown;

[0023] Figure 2 A top view of a battery cover according to an embodiment of the present utility model is shown;

[0024] Figure 3a For Figure 2 AA section view;

[0025] Figure 3b For Figure 3a A magnified image of point A;

[0026] Figure 3c For Figure 3a A magnified view of point B;

[0027] Figure 4a A top view of a pole according to an embodiment of the utility model is shown;

[0028] Figure 4b For Figure 4a BB cross-section diagram;

[0029] Figure 5a A top view of an upper plastic part of an embodiment of the utility model is shown;

[0030] Figure 5b For Figure 5a CC profile of ;

[0031] Figure 6aA bottom view of a snap ring according to an embodiment of the present invention is shown;

[0032] Figure 6b For Figure 6a DD profile diagram;

[0033] Figure 7a A bottom view of a sealing ring according to an embodiment of the present invention is shown;

[0034] Figure 7b For Figure 7a EE profile diagram;

[0035] Figure 8a A top view of a light aluminum sheet according to an embodiment of the present utility model is shown;

[0036] Figure 8b For Figure 8a FF cross-section diagram;

[0037] Figure 9a A top view of a lower plastic part of an embodiment of the utility model is shown;

[0038] Figure 9b For Figure 9a GG profile;

[0039] Fig.9c For Figure 9b Enlarged view of point C.

[0040] Fig.10 An exploded diagram of a battery cell according to an embodiment of the utility model is shown;

[0041] Fig.11 A three-dimensional diagram of a battery cell according to an embodiment of the present invention is shown.

[0042] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0043] The specific implementation of the present utility model will be further described below in conjunction with the accompanying drawings.

[0044] An embodiment of the present utility model provides a battery top cover. Figures 1 to 9cAs shown, the battery top cover 100 includes a plain aluminum sheet 140, a pole 110 and a retaining ring 160. Among them, the plain aluminum sheet 140 itself is generally a plate-like structure, and a first through hole 141 is arranged thereon. It should be noted that two spaced first through holes 141 are arranged on the plain aluminum sheet 140 to correspond to the positive and negative poles in the pole 110 respectively. The pole 110 contains a pole body 111 and a boss 112. The pole body 111 itself is columnar, and is used for welding and conducting with the external circuit of the battery cell. The boss 112 itself is cylindrical, and is protrudingly arranged in the axial direction of the pole body 111 (in Figure 1 The axial direction of the middle pole body 111 is arranged along the up-down direction) on one side, and the radial dimension is reduced relative to the pole body 111. The boss 112 is used for welding and conducting with the connecting piece 200 inside the battery cell 500. The snap ring 160 includes a snap ring body 161 and a snap ring sleeve 162. The snap ring body 161 is a plate-like circular ring. The snap ring sleeve 162 is sleeve-shaped and protrudingly arranged on the snap ring body 161. The inner cavity of the snap ring sleeve 162 is coplanar with the inner cavity of the snap ring body 161. The wall of the free end section of the snap ring sleeve 162 gradually shrinks and extends inward to form a shrinking section 163. During the assembly process, the boss 112 and the snap ring sleeve 162 are both inserted into the first through hole 141 and extend relative to each other, and the boss 112 is sleeved into the inner wall of the snap ring sleeve 162. The pole body 111 and the snap ring body 161 are clamped on both sides of the bare aluminum sheet 140. Afterwards, a riveting groove 113 is formed on the boss 112 by riveting and stamping to form a snap connection with the constricted section 163 of the snap ring sleeve 162. Then, in the battery top cover, the snap ring sleeve 162 is snapped on the riveting groove 113 of the boss 112.

[0045] It can be seen that in the present application, a snap ring 160 is provided on the side of the bare aluminum sheet 140 opposite to the side where the pole 110 is located. The snap ring sleeve 162 of the snap ring 160 is inserted into the first through hole 141, and is riveted and fixed to the boss 112 inserted into the first through hole 141. At the same time, the snap ring body 161 of the snap ring 160 and the pole body 111 of the pole 110 clamp the bare aluminum sheet 140. Therefore, by adding the snap ring 160 to limit the position of the pole 110 on the bare aluminum sheet 140, and fixing the pole 110 at the first through hole 141, it is avoided to use laser welding in the prior art to connect the pole and the bare aluminum sheet, thereby correspondingly improving the current carrying capacity of the pole 110 and simplifying the processing procedure. In particular, the necked section 163 of the snap ring 160 can restrain the riveted side wall of the boss 112 of the riveted and stamped pole 110, while the main body of the snap ring sleeve 162 provides support for the side wall of the boss 112 in the axial direction of the snap ring 160, thereby ensuring the connection strength between the pole 110 and the snap ring 160, and also helps to form pressure on the sealing ring 120 described later to ensure the sealing of the pole 110.

[0046] The material of the clamping ring 160 can be aluminum alloy, copper alloy, stainless steel, etc.

[0047] The battery top cover 100 also includes a sealing ring 120. In terms of its own structure, the sealing ring 120 includes a sealing ring body 121 and a thinning ring portion 122 abutting against the inner wall of the sealing ring body 121. In other words, the thinning ring portion 122 of the sealing ring 120 located in the radial direction is thinner relative to the sealing ring body 121 located in the radial direction outside, and the axial side of the sealing ring body 121 and the thinning ring portion 122 close to the pole 110 are in the same plane. After installation, the axial side of the sealing ring body 121 and the thinning ring portion 122 close to the pole 110 abuts against the pole body 111. The axial side of the sealing ring body 121 away from the pole 110 abuts against the bare aluminum sheet 140, and the axial side of the thinning ring portion 122 away from the pole 110 abuts against the clamping ring sleeve 162. It can be seen that the sealing ring body 121 is arranged between the pole 110 and the aluminum sheet 140. When the pole 110 and the clamping ring 160 are riveted, the sealing ring body 121 is compressed and deformed, and plays a sealing role. Similarly, the thinning ring part 122 also plays a role in sealing the pole 110 and the clamping ring sleeve 162. This sealing method has reliable sealing and simple structure.

[0048] A lower plastic part 150 is provided on the side of the bare aluminum sheet 140 away from the pole 110 in the axial direction. A second through hole 151 is provided on the lower plastic part 150, which is opposite to the first through hole 141. It can be understood that there are also two second through holes 151 to adaptably match the positive and negative poles of the pole 110. The lower plastic part 150 is an integral component, on which two second through holes 151 are arranged at intervals. A lower plastic part spacer 152 is protrudingly provided on the inner wall of the second through hole 151. The inner cavity of the lower plastic part spacer 152 is connected to the second through hole 151. After installation, the lower plastic part spacer 152 is located between the snap ring sleeve 162 and the first through hole 141, and extends toward the side close to the pole 110, until between the sealing ring body 121 and the snap ring sleeve 162. The snap ring body 161 abuts against the side of the lower plastic part 150 away from the pole 110. Preferably, the inner peripheral wall of the sealing ring body 121 is configured as an inclined surface facing the clamping ring body 161, and the outer peripheral wall of the lower plastic spacer 152 matches the inner peripheral wall of the sealing ring body 121. This arrangement can effectively isolate the clamping ring 160 from the bare aluminum sheet 140, play an insulating protection role, and ensure safety.

[0049] The battery top cover 100 also includes a plate-shaped upper plastic part 130. The upper plastic part 130 includes a plate-shaped upper plastic part body 131 and an upper plastic sleeve 132 arranged at the outer peripheral wall of the upper plastic part body 131. A third through hole 133 is arranged on the upper plastic part body 131. In other words, the upper plastic part 130 is constructed in a box shape, and a third through hole 133 is arranged on the upper plastic part body 131 at the bottom of the box. The third through hole 133 is sleeved on the outer peripheral side of the sealing ring main body 121, and the upper plastic part body 131 is located between the pole body 111 and the bare aluminum sheet 140. The upper plastic sleeve 132 is sleeved on part of the outer peripheral wall of the pole body 111. It can be understood that there are also two upper plastic parts 130, which correspond to the positive and negative poles of the pole 110 respectively. The two upper plastic parts 130 corresponding to the positive and negative poles have the same or similar structures, but are made of different materials. Specifically, the upper plastic part 130 at the positive pole is made of conductive plastic, while the upper plastic part 130 at the negative pole is made of insulating plastic.

[0050] A first sink 142 is provided on the bare aluminum sheet 140. The first sink 142 is located outside the first through hole 141 and protrudes and extends in the direction of the clamp body 161. The upper plastic sleeve 132 and part of the pole body 111 are embedded in the first sink 142. At the same time, a second sink 153 for accommodating the first sink 142 is provided on the lower plastic part 150. It should be noted that the shapes of the first sink 142 and the second sink 153 are related to the shape of the pole body 111. In the figure, an embodiment in which the radial cross section of the pole body 111 is square is given, and the first sink 142 and the second sink 153 are also correspondingly constructed as a square in order to accommodate the matching pole body 111. However, the pole body 111 of the present application can also be constructed in other structural shapes, for example, circular, runway-shaped, polygonal, etc. The shapes of the pole bodies 111 of the two positive and negative poles on the same battery top cover 100 can be the same or different. It is understandable that if the shapes of the pole bodies 111 of the two positive and negative poles are different, other components matching the pole body 111, such as the first sink 142 and the second sink 153, etc., will also be changed accordingly.

[0051] It can be understood that the battery top cover 100 has two poles 110, which are respectively the positive pole and the negative pole. Correspondingly, the bare aluminum sheet 140 has two first through holes 141 to respectively connect the positive pole and the negative pole. Furthermore, at the positions of the respective first through holes 141, a sealing ring 120, an upper plastic part 130, a lower plastic part 150 (it should be noted here that an embodiment in which two second through holes 151 are set to the same lower plastic part 150 is given in the figure, but the lower plastic part 150 can also be two split components, so as to respectively be provided with second through holes 151) and a snap ring 160 that match the pole 110 are respectively provided.

[0052] The structures of the positive pole and the negative pole are the same or similar, but the materials used to make them are different. For example, the positive pole is made of aluminum alloy, and the negative pole is made of copper-aluminum composite material or copper. A weight-reducing groove 114 is provided on one side of the pole body 111 away from the clamp body 161. The shape of the weight-reducing groove 114 is not limited. For example, the radial cross section of the weight-reducing groove 114 may be circular.

[0053] The present application also relates to a battery cell 500. Fig.10 and 11 As shown, the battery cell 500 includes the above-mentioned battery top cover 100, connecting piece 200, winding core 300 and aluminum shell 400. Among them, the pole ear 310 (which can be understood to include positive and negative pole ears) on the winding core 300 is welded with the connecting piece 200 (which can be understood to correspond to the positive pole and the negative pole), and then the connecting piece 200 is correspondingly connected to the pole 110 on the battery top cover 100 by welding. The welding between the pole ear 310, the connecting piece 200 and the pole 110 ensures that the winding core 300 is conductive with the external circuit. After the winding core 300 and the connecting piece 200 are placed in the aluminum shell 400, the battery top cover 100 is welded to the aluminum shell 400 and sealed to ensure that the interior of the battery cell 500 is isolated from the external environment.

[0054] The present application also relates to a vehicle, wherein the vehicle comprises the battery cell 500 described above.

[0055] In the present application, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0056] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, on the basis of the principles of the present invention, several other modifications can be made, which should also be considered as the protection scope of the present invention.

Claims

1. A battery top cover, characterized in that: include: A plain aluminum sheet, wherein a first through hole is provided on the plain aluminum sheet, The pole comprises a columnar pole body and a cylindrical boss arranged on one axial side of the pole body. The snap ring comprises a circular snap ring body and a snap ring sleeve extending protrudingly from the inner cavity wall of the snap ring body, wherein the free end section of the snap ring sleeve is configured as a necking section gradually extending radially inwardly of the snap ring sleeve. Among them, the boss and the retaining ring sleeve extend relatively to each other in the first through hole, the boss is sleeved into the inner wall of the retaining ring sleeve, and the rivet groove formed on the outer wall of the boss is riveted and clamped with the shrinking section, and the pole body and the retaining ring body are clamped on both sides of the bare aluminum sheet.

2. The battery top cover according to claim 1, characterized in that: It also includes a sealing ring that is sleeved on the outer wall of the boss, the sealing ring includes a sealing ring body and a thinning ring portion that abuts against the inner wall of the sealing ring body, the sealing ring body is arranged between the pole body and the bare aluminum sheet, and the thinning ring portion is arranged between the pole body and the clamping ring sleeve.

3. The battery top cover according to claim 2, characterized in that: It also includes a lower plastic part arranged between the plain aluminum sheet and the retaining ring body, the lower plastic part is provided with a second through hole opposite to the first through hole, a lower plastic part spacer is protrudingly provided on the inner wall of the second through hole, the lower plastic part spacer is located between the retaining ring sleeve and the inner wall of the first through hole and extends between the sealing ring body and the retaining ring sleeve.

4. The battery top cover according to claim 3, characterized in that: The inner peripheral wall of the sealing ring main body is configured as an inclined surface facing the clamping ring main body, and the outer peripheral wall of the lower plastic part spacer matches the inner peripheral wall of the sealing ring main body.

5. The battery top cover according to claim 3, characterized in that: It also includes an upper plastic part, which includes a plate-shaped upper plastic part body and an upper plastic sleeve protrudingly extending from the peripheral wall of the upper plastic part body. A third through hole is provided on the upper plastic part body, and the third through hole is sleeved on the peripheral wall of the sealing ring body. The upper plastic part body is located between the pole body and the bare aluminum sheet, and the upper plastic sleeve is sleeved on part of the peripheral wall of the pole body.

6. The battery top cover according to claim 5, characterized in that: A first recessed groove is provided on the bare aluminum sheet, which is located outside the first through hole and protrudes toward the clamping ring body. The upper plastic sleeve and part of the pole body are embedded in the first recessed groove. A second recessed groove for matching and accommodating the first recessed groove is provided on the lower plastic part.

7. The battery top cover according to claim 6, characterized in that: Two first through holes are arranged on the bare aluminum sheet, and the poles include a positive pole and a negative pole which are respectively connected to the first through holes in a corresponding manner.

8. The battery top cover according to any one of claims 1 to 7, characterized in that: A weight-reducing groove is arranged on a side surface of the pole body away from the clamp ring body.

9. A battery cell, characterized in that: Comprising a battery top cover according to any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising the battery cell according to claim 9.

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