Battery top cover

Abstract

The invention discloses a battery top cover which comprises a cover plate and a pole, a through hole is formed in the cover plate, an outer ring seat is arranged outside the upper ring wall of the through hole, a lining ring is arranged outside the lower ring wall of the through hole, and the inner diameters of the outer ring seat and the lining ring in the through hole are coaxially communicated to form an assembly hole; the middle part of the pole is arranged in the assembly hole, an outer pressing part is arranged at the outer end of the pole, an inner pressing part is arranged at the inner end of the pole, the outer pressing part is extruded towards the periphery to flatly fill a seat cavity of the outer ring seat, and the inner pressing part is extruded towards the periphery to flatly cover the lining ring, so that the pole and the cover plate are fixed.

Description

Technical Field

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

[0002] The new energy industry is currently booming, and electric vehicles have generally entered the public eye. The cost of power batteries generally accounts for a large proportion of the entire vehicle. Cost control of power batteries is conducive to reducing normal costs.

[0003] In power batteries, reducing the proportion of the outer shell weight of the battery cell is very beneficial to reducing costs and increasing efficiency, especially the electrode part in the top cover assembly, which often has a certain height and not only occupies a large space but also has a large weight. Therefore, optimizing the top cover design is of great significance to reducing the weight of the outer shell of the battery cell. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery top cover, which optimizes the fixing form of the pole, reduces the number of components and process costs, reduces costs, optimizes the space occupied by the electrode composition, reduces the height of the outer pole, and reduces weight.

[0005] The technical solution adopted by the present invention to solve its technical problems is to propose a battery top cover, including a cover plate and a pole, a through hole is opened on the cover plate, an outer ring seat is arranged outside the upper ring wall of the through hole, and an inner lining ring is arranged outside the lower ring wall of the through hole, so that the outer ring seat and the inner lining ring are coaxially connected at the inner diameter of the part in the through hole to form an assembly hole, the middle part of the pole is placed in the assembly hole, the outer end of the pole is provided with an external pressure part, and the inner end of the pole is provided with an internal pressure part, the external pressure part fills the seat cavity of the outer ring seat, and the internal pressure part covers the inner lining ring, so that the pole is fixed to the cover plate.

[0006] Furthermore, the external pressure portion is pressed and flattened around to fill the seat cavity of the outer ring seat, and the internal pressure portion is pressed and flattened around to cover the inner lining ring.

[0007] Furthermore, the seat cavity of the outer ring seat is located outside the cover plate, and the inner diameter of the seat cavity is larger than the inner diameter of the through hole.

[0008] Furthermore, when the external pressure portion is squeezed and flattened in all directions, the external pressure portion and the outer end surface of the pole are flush.

[0009] Furthermore, the outer end surface of the pole is flush with the end surface of the ring wall of the outer ring seat.

[0010] Furthermore, an inner structural plate is provided on the inner side of the cover plate, and the inner structural plate at least surrounds the outside of the inner lining ring, and the thickness of the portion of the inner structural plate surrounding the inner lining ring is consistent with the thickness of the portion of the inner lining ring exposed outside the through hole.

[0011] Furthermore, the inner structural plate is provided with an inner pressure cavity around the inner lining ring, and the bottom wall thickness of the inner pressure cavity is consistent with the thickness of the portion of the inner lining ring exposed outside the through hole.

[0012] Furthermore, when the internal pressure portion is squeezed and flattened on all sides, the internal pressure portion at least covers the bottom wall of the internal pressure cavity, so that the portion of the inner lining ring exposed outside the through hole is completely covered.

[0013] Furthermore, an inner connecting tube having an outer diameter the same as the inner diameter of the through hole is provided at the lower part of the seat cavity, the inner connecting tube is coaxial with the seat cavity, and the structural outer diameter of the seat cavity is larger than the inner diameter of the through hole, so that when the inner connecting tube is placed on the upper outer wall of the through hole, the seat cavity is placed outside the cover plate.

[0014] Furthermore, the inner lining ring includes an inner cavity ring inserted into the lower ring wall of the through hole and an outer flat ring placed outside the through hole. The outer diameter of the inner cavity ring is the same as the inner diameter of the through hole. The outer flat ring is coaxial with the inner cavity ring. The outer diameter of the outer flat ring is larger than the inner diameter of the through hole. The inner diameter of the outer flat ring is the same as the inner diameter of the inner cavity ring.

[0015] Furthermore, the inner diameter of the inner cavity ring is the same as the inner diameter of the inner connecting tube, and the sum of the length of the inner cavity ring and the length of the inner connecting tube is the length of the through hole. The inner cavity ring and the inner connecting tube are coaxially abutted and connected in the through hole to form the assembly hole.

[0016] Furthermore, it also includes an explosion-proof valve, which is located in the middle of the cover plate.

[0017] Furthermore, the cover plate is provided with two through holes, and the poles are installed in the two through holes to form a positive contact and a negative contact respectively.

[0018] Furthermore, the inner structural plate is arranged on the inner side of the cover plate, and a limiting structure is extended downward to limit the battery cell.

[0019] The beneficial effects of the present invention are: The battery top cover proposed in the present invention optimizes the fixing form of the pole, reduces the number of components and process costs, lowers costs, optimizes the space occupied by the electrode components, reduces the height of the outer pole, and reduces weight.

[0020] The top cover has a simple structure, which can reduce the height of the pole on the top cover, reduce the space occupied and weight of the shell, and is conducive to improving the energy density of the battery pack and optimizing the structural layout of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In the drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, but not all. It is clear that those skilled in the art can derive other drawings from these drawings without inventive effort.

[0022] Figure 1 This is a structural diagram of a battery top cover according to an embodiment of the present invention; Figure 2 is a schematic cross-sectional view of a battery top cover according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the assembly of the pole and the top cover; Figure 4 This is a side view of the pole after it is assembled with the top cover; Figure 5 This is the first schematic diagram before the pole is riveted; Figure 6 This is the second schematic diagram before the pole is riveted; Figure 7 This is the third schematic diagram before the pole is riveted; Figure 8 This is the fourth schematic diagram before the pole is riveted; Figure 9 This is the fifth schematic diagram of the pole before riveting.

[0023] In the figure: 1, cover plate; 2, pole; 3, outer ring seat; 4, inner lining ring; 5, explosion-proof valve; 11, inner structure plate; 21, outer pole; 22, inner pole; 211, external pressure part; 221, internal pressure part. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the embodiments of the present invention and the technical solutions in the prior art, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other embodiments can be obtained based on these drawings without inventive work. In addition, the design orientation only represents the relative position relationship between the components, not the absolute position relationship.

[0025] The embodiment of the present invention provides a battery top cover, please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4It mainly includes a cover plate 1 and a pole 2. A through hole is opened on the cover plate 1. An outer ring seat 3 is arranged outside the upper ring wall of the through hole, and an inner lining ring 4 is arranged outside the lower ring wall of the through hole, so that the inner diameter of the outer ring seat 3 and the inner lining ring 4 in the through hole are coaxially connected to form an assembly hole. The middle part of the pole 2 is placed in the assembly hole, an external pressure part 211 is provided at the outer end of the pole 2, and an internal pressure part 221 is provided at the inner end of the pole 2. The external pressure part 211 is squeezed to fill the seat cavity of the outer ring seat 3, and the internal pressure part 221 is squeezed to cover the inner lining ring 4, so that the pole 2 is fixed to the cover plate 1.

[0026] In this application, the pole 2 undergoes structural changes before and after assembly. Figure 4 , is the structure of the pole 2 after assembly. Before assembly, in order to penetrate the assembly hole, the outer diameter of at least one end of the pole 2 should be matched with the outer diameter of the assembly hole. For example, the structure before assembly can be referred to Figure 5-Figure 9 .

[0027] by Figure 4 For example, the pole 2 is divided into an upper and lower structure at the position of the straight line in the figure, the upper part is the outer pole 21, and the lower part is the inner pole 22. The outer pole 21 is provided with an external pressure portion 211, and the inner pole 22 is provided with an internal pressure portion 221. The external pressure portion 211 and the internal pressure portion 221 are squeezed flat on all sides, so that the pole 2 is clamped and fixed in the assembly hole, forming a fixing effect with the cover plate 1, and at the same time, the outer ring seat 3 and the inner liner ring 4 are synchronously limited and fixed.

[0028] See Figure 5-Figure 9 The pre-assembly morphological structure can be selected according to actual needs, and the extrusion can be performed based on the post-assembly morphological structure.

[0029] Figure 5 A dividing line is retained in the middle to match the outer diameter of both ends with the assembly hole. Both ends must be squeezed flat on all sides during assembly. Figure 6 The dividing line is retained in the middle, the outer diameter of the outer pole 21 matches the assembly hole, the inner pole 22 is trumpet-shaped, and both ends need to be squeezed flat on all sides during assembly; Figure 7 The dividing line is retained in the middle, the outer diameter of the outer pole 21 matches the assembly hole, and the inner pressure portion 221 of the inner pole 22 has already presented an assembly form. During assembly, it is only necessary to squeeze the outer pressure portion 211 to the four sides to make it flat; Figure 8 The dividing line is retained in the middle, the outer diameter of the inner pole 22 matches the assembly hole, and the outer pressure portion 211 of the outer pole 21 has already presented an assembly form. During assembly, it is only necessary to squeeze the inner pressure portion 221 to the four sides and make it flat; Figure 9The dividing line is retained in the middle, the outer diameter of the inner pole 22 matches the assembly hole, the outer pole 21 is trumpet-shaped, and both ends need to be squeezed flat on all sides during assembly.

[0030] In an embodiment of the present application, an outer ring seat 3 is arranged outside the upper ring wall of the through hole, and an inner lining ring 4 is arranged outside the lower ring wall of the through hole. When the pole 2 is assembled, it cooperates with the outer ring seat 3 and the inner lining ring 4 to achieve fixed assembly with the cover plate 1. The assembly position is the assembly hole, and the assembly hole is composed of the inner diameters of the outer ring seat 3 and the inner lining ring 4 in the through hole connected in a coaxial form.

[0031] The middle structure of the pole 2 is solid, with an external pressure portion 211 at the outer end and an internal pressure portion 221 at the inner end. Both the external pressure portion 211 and the internal pressure portion 221 are outside the range of the through hole. When they are squeezed and flattened on all sides, their size is larger than the inner diameter of the through hole, which can form a limiting effect and prevent the pole 2 from escaping from the through hole / assembly hole.

[0032] In order to limit the structure after extrusion, the outer ring seat 3 can be configured with a seat cavity to limit the structure and area of the external pressure part 211 after extrusion. The inner lining ring 4 itself does not have a limiting property, and can cooperate with the inner structural plate 11 on the inner side of the cover plate 1 to achieve a limiting effect, limiting the structure of the internal pressure part 221 after extrusion within a certain area and the area within a certain range, thereby ensuring the stability of the limiting effect and reducing the weight proportion of the pole 2.

[0033] Of course, the inner lining ring 4 can be replaced with an outer ring seat 3, and the same seat cavity structure can be used to limit the structure after extrusion; but the seat cavity has a certain height, which will cause the height of the pole 2 to increase. Therefore, the configuration of the inner lining ring 4 or the outer ring seat 3 at the inner end can be adjusted based on actual conditions.

[0034] It should be clear that the seat cavity is located outside the cover plate 1 , and its inner diameter is larger than that of the through hole, and is used to accommodate the physical structure of part of the pole 2 and the entire structure after being squeezed by the external pressure portion 211 .

[0035] See Figure 3 When the external pressure portion 211 is squeezed and flattened, it is flush with the outer end surface of the pole 2. That is, after the extrusion is completed, the external pressure portion 211 is flush with the outer end surface of the physical structure of the pole 2 and can be considered the outer end surface. In a preferred embodiment, the outer end surface of the pole 2 is flush with the end surface of the outer ring seat 3. That is, the outer end surface is flush with the end surface of the outer ring seat 3. However, for the sake of process accuracy, the outer end surface may be slightly higher than the end surface of the outer ring seat 3.

[0036] In an embodiment of the present application, an inner structural plate 11 is provided on the inner side of the cover plate 1, and the inner structural plate 11 at least surrounds the inner lining ring 4, and the thickness of the portion of the inner structural plate 11 surrounding the inner lining ring 4 is consistent with the thickness of the portion of the inner lining ring 4 exposed outside the through hole.

[0037] See Figure 3 The inner plate 11 is provided with an inner pressure cavity around the inner lining ring 4, and the bottom wall thickness of the inner pressure cavity is consistent with the thickness of the portion of the inner lining ring 4 exposed outside the through hole.

[0038] During specific implementation, the structural thickness of the cover plate 1 around the inner side of the through hole can be reduced, and the thickness of the inner side of the cover plate 1 in the area where the through hole is located can be reduced, so that when the inner structural plate 11 extends to this point, a step is generated, and an internal pressure chamber is constructed based on the step. Without increasing the overall thickness of the cover plate 1, an external space for the inner lining ring 4 is provided, and at the same time, a structural space is provided for configuring the internal pressure chamber.

[0039] It is understandable that, in the region where the step is located, the thickness of the inner structural plate 11 is consistent with the thickness of the portion of the inner liner ring 4 exposed outside the through hole. At this time, the outer surface of the inner structural plate 11 is flush with the outer end surface of the inner liner ring 4. The inner structural plate 11, which is backed by the step, can directly form an internal pressure cavity surrounding the inner liner ring 4 as the structure of the cover plate 1 changes. The internal pressure cavity can be annular, and its ring diameter is larger than the outer diameter of the inner liner ring 4.

[0040] As a preferred embodiment, when the internal pressure portion 221 is squeezed flat on all sides, the internal pressure portion 221 covers at least the bottom wall of the internal pressure chamber, so that the portion of the inner lining ring 4 exposed outside the through hole is completely covered, thereby fixing the inner lining ring 4 in the through hole.

[0041] In the embodiment of the present application, based on the outer ring seat 3 and the inner lining ring 4 forming an assembly hole, when the pole 2 forms a fixed relationship with the cover plate 1 based on the assembly hole, the outer ring seat 3 and the inner lining ring 4 are simultaneously fixed on the cover plate 1.

[0042] In a specific embodiment, an inner connecting tube having an outer diameter the same as the inner diameter of the through hole can be provided at the lower part of the seat cavity. The inner connecting tube is coaxial with the seat cavity, thereby forming an outer ring seat 3. The structural outer diameter of the seat cavity is larger than the inner diameter of the through hole, so that when the inner connecting tube is placed on the upper outer wall of the through hole, the seat cavity is placed on the outside of the cover plate.

[0043] In a specific embodiment, the inner lining ring 4 may include an inner cavity ring inserted into the lower ring wall of the through hole and an outer flat ring placed outside the through hole, the outer diameter of the inner cavity ring is the same as the inner diameter of the through hole, the outer flat ring is coaxial with the inner cavity ring, the outer diameter of the outer flat ring is larger than the inner diameter of the through hole, and the inner diameter of the outer flat ring is the same as the inner diameter of the inner cavity ring.

[0044] Based on the above structure of the outer ring seat 3 and the inner lining ring 4, in order to ensure that both ends of the pole 2 can be stably fixed on the cover plate 1 after extrusion, the sizes of the inner connecting tube and the inner cavity ring should be restricted. At least it should be ensured that the inner diameter of the inner cavity ring is the same as the inner diameter of the inner connecting tube, and the sum of the length of the inner cavity ring and the length of the inner connecting tube is the length of the through hole. The inner cavity ring and the inner connecting tube are coaxially abutted and connected in the through hole to form an assembly hole.

[0045] It is feasible that the sum of the length of the inner cavity ring and the length of the inner connecting tube can be designed based on the thickness of the cover plate 1 at the through hole, and the height of the physical structure of the pole 2 does not necessarily need to be exactly the same; at the same time, the size of the internal pressure portion 221 can be designed to be larger, that is, the length when not extruded is longer, and can be greater than the length of the external pressure portion 211. During extrusion, only part of the structure at the lower end of the internal pressure portion 221 is extruded so that its coverage area meets the requirements, and the physical structure is placed in an upper position within the assembly hole, that is, the physical structure is flush with the annular wall port of the seat cavity, thereby reducing the weight of the physical structure, forming a flat electrode contact on the outside of the cover plate 1, and forming an electrode contact with a recessed structure on the inside of the cover plate 1, which does not affect the welding of the internal electrode contact and the conduction of the external electrode contact; thereby, the weight of the pole 2 can be further reduced.

[0046] Of course, for the welding contact point, the outer side can also form an electrode contact with a concave structure, in which case the weight of the pole 2 can be further reduced. However, the structural stability of the pole 2 must be ensured.

[0047] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0048] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific embodiments of the present invention should not be considered to be limited to these descriptions. For those skilled in the art to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the scope of protection of the present invention.

Claims

1. A battery top cover, characterized in that: The invention comprises a cover plate (1) and a pole (2), wherein a through hole is provided on the cover plate (1), an outer ring seat (3) is arranged on the outer side of the upper ring wall of the through hole, and an inner lining ring (4) is arranged on the outer side of the lower ring wall of the through hole, so that the inner diameter of the outer ring seat (3) and the inner lining ring (4) in the through hole are coaxially connected to form an assembly hole, the middle part of the pole (2) is placed in the assembly hole, the outer end of the pole (2) is provided with an external pressure part (211), and the inner end of the pole (2) is provided with an internal pressure part (221), the external pressure part (211) fills the seat cavity of the outer ring seat (3), and the internal pressure part (221) covers the inner lining ring (4), so that the pole (2) and the cover plate (1) are fixed.

2. A battery top cover according to claim 1, characterized in that: The external pressure portion (211) is pressed and flattened in all directions to fill the seat cavity of the outer ring seat (3), and the internal pressure portion (221) is pressed and flattened in all directions to cover the inner lining ring (4).

3. The battery top cover according to claim 1, characterized in that: The seat cavity of the outer ring seat (3) is located outside the cover plate (1), and the inner diameter of the seat cavity is larger than the inner diameter of the through hole.

4. A battery top cover according to claim 2, characterized in that: When the external pressure portion (211) is squeezed flat on all sides, the external pressure portion (211) is flush with the outer end surface of the pole (2); the outer end surface of the pole (2) is flush with the ring wall end surface of the outer ring seat (3).

5. The battery top cover according to claim 2, characterized in that: An inner structural plate (11) is provided on the inner side of the cover plate (1), the inner structural plate (11) at least surrounds the outside of the inner lining ring (4), and the thickness of the portion of the inner structural plate (11) surrounding the inner lining ring (4) is consistent with the thickness of the portion of the inner lining ring (4) exposed outside the through hole.

6. A battery top cover according to claim 5, characterized in that: The inner structural plate (11) is provided with an inner pressure cavity around the inner lining ring (4), and the bottom wall thickness of the inner pressure cavity is consistent with the thickness of the portion of the inner lining ring (4) exposed outside the through hole.

7. A battery top cover according to claim 6, characterized in that: When the internal pressure portion (221) is squeezed and flattened in all directions, the internal pressure portion (221) covers at least the bottom wall of the internal pressure cavity, so that the portion of the lining ring (4) exposed outside the through hole is completely covered.

8. The battery top cover according to claim 1, characterized in that: An inner connecting tube having an outer diameter the same as the inner diameter of the through hole is provided at the lower part of the seat cavity. The inner connecting tube is coaxial with the seat cavity. The structural outer diameter of the seat cavity is larger than the inner diameter of the through hole. When the inner connecting tube is placed on the upper outer wall of the through hole, the seat cavity is placed outside the cover plate.

9. The battery top cover according to claim 8, characterized in that: The inner lining ring (4) comprises an inner cavity ring inserted into the lower ring wall of the through hole and an outer flat ring placed outside the through hole, the outer diameter of the inner cavity ring is the same as the inner diameter of the through hole, the outer flat ring is coaxial with the inner cavity ring, the outer diameter of the outer flat ring is larger than the inner diameter of the through hole, and the inner diameter of the outer flat ring is the same as the inner diameter of the inner cavity ring.

10. The battery top cover according to claim 9, characterized in that: The inner diameter of the inner cavity ring is the same as the inner diameter of the inner connecting tube, and the sum of the length of the inner cavity ring and the length of the inner connecting tube is the length of the through hole. The inner cavity ring and the inner connecting tube are coaxially abutted and connected in the through hole to form the assembly hole.

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