Cover plate, top cover assembly and cylindrical battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a cover plate, a top cover assembly and a cylindrical battery. The cover plate comprises a cover plate body and a bending part, the cover plate body is used for sealing and covering the opening of the battery shell, the bending part is arranged at the end part of the cover plate body along the horizontal outward direction, the bending part is provided with a first assembly surface, and the cover plate body is provided with a second assembly surface; the first assembling face and the second assembling face jointly define an assembling area used for assembling the side wall of the battery shell, the part, close to the second assembling face, of the first assembling face is inwards concavely provided with a receding groove, and an arc face is formed between the groove bottom of the receding groove and the second assembling face; and the end part of the arc surface and the first assembling surface are positioned on different horizontal planes. The receding groove plays a receding role, and when the battery shell is inserted into the assembly area, the inner side wall and the top surface of the battery shell can be tightly attached to the first assembly surface and the second assembly surface respectively, so that the battery shell can be mounted in place, and the welding difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production and manufacturing, in particular to a cover plate, a top cover assembly and a cylindrical battery. Background Art

[0002] Combined Figure 1 and Figure 2 As shown, the existing cylindrical battery includes a top cover assembly and a battery case. The top cover assembly includes a cover plate. The existing processing generally uses laser welding to fix the cover plate and the case. When the conventional cover plate structure is formed by die stamping, there will be an arc R at the bending corner of the end of the cover plate. However, with the continuous increase of the single capacity of power battery cells, in order to ensure the safety of the battery, the thickness of the cover plate is getting larger and larger, and the arc R also increases with the increase of the thickness of the cover plate. This results in that the battery case and the cover plate cannot be properly installed in place during fitting and assembly, thus affecting the performance of the product and also bringing difficulties to subsequent laser welding.

[0003] Therefore, there is an urgent need for a cover plate, a top cover assembly and a cylindrical battery to solve the problems existing in the prior art. Summary of the Utility Model

[0004] The first object of the utility model is to provide a cover plate, which can ensure that the cover plate and the case are installed in place, thereby improving the assembly quality of the cover plate and the case.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The cover plate includes a cover plate body and a bending part. The cover plate body is used to seal the opening of the battery case. The end of the cover plate body is provided with the bending part along the horizontally outward direction. The bending part has a first assembly surface, and the cover plate body has a second assembly surface. The first assembly surface and the second assembly surface jointly enclose an assembly area for assembling the side wall of the battery case. And a relief groove is recessed inwardly in a part of the first assembly surface close to the second assembly surface. There is an arc surface between the bottom of the relief groove and the second assembly surface, and the end of the arc surface and the first assembly surface are on different horizontal planes.

[0007] Preferably, the depth range of the relief groove is 0.06 mm to 0.1 mm.

[0008] Preferably, the radian range of the arc surface is 0.05° to 0.15°.

[0009] Preferably, the length range of the bottom of the relief groove is 0.2 mm to 0.3 mm.

[0010] Preferably, a first clamping block protrudes from the first assembly surface, and a first clamping groove is provided on the battery housing. When the battery housing is located in the assembly area, the first clamping block can slide into and be inserted into the first clamping groove in a limited manner;

[0011] And / or, a second clamping block protrudes from the second assembly surface, and a second clamping groove is provided on the battery housing. When the battery housing is located in the assembly area, the second clamping block can slide into and be inserted into the second clamping groove in a limited manner.

[0012] Preferably, the cross-sections of the first clamping block and the first clamping groove are semi-circular;

[0013] And / or, the cross-sections of the second clamping block and the second clamping groove are semi-circular.

[0014] Preferably, the first clamping block is integrally formed with the cover plate; alternatively, the first clamping block is connected to the bent portion by welding; or the first clamping block is adhesively connected to the bent portion.

[0015] Preferably, the avoidance groove is a U-shaped groove or a trapezoidal groove.

[0016] The beneficial effects of the cover plate provided by the present utility model:

[0017] The second object of the present utility model is to provide a top cover assembly, which can avoid assembly errors and improve the assembly accuracy and product stability of the top cover assembly.

[0018] To achieve this purpose, the present utility model adopts the following technical solutions:

[0019] A top cover assembly, including a pole column, a transition piece, a current collecting plate, and the above-mentioned cover plate. The pole column is arranged at the center position of the cover plate. One end of the transition piece is connected to the center of the cover plate, and the other end of the transition piece is connected to the current collecting plate.

[0020] The beneficial effects of the top cover assembly provided by the present utility model: The top cover assembly includes a pole column, a transition piece, a current collecting plate, and the above-mentioned cover plate. Among them, a technique is provided at the center position of the cover plate. One end of the transition piece is connected to the center of the cover plate, and the other end of the transition piece is connected to the current collecting plate. The current collecting plate is used to electrically connect the pole column and the battery cell. In the top cover assembly provided in this embodiment, due to the provision of the cover plate, the avoidance groove on the cover plate can avoid the battery housing, so that the battery housing can be accurately inserted into the preset position in the assembly area, thereby avoiding assembly errors and improving the assembly accuracy and product stability of the top cover assembly.

[0021] The third object of the present utility model is to provide a cylindrical battery, which can improve the assembly quality and enhance the use safety and reliability.

[0022] To achieve this purpose, the utility model adopts the following technical solutions:

[0023] The cylindrical battery includes a battery housing, a wound core, and the above-mentioned top cover assembly. The battery housing is cylindrical, the wound core is disposed inside the battery housing, the top cover assembly is disposed at the opening of the battery housing, and the current collector plate of the top cover assembly is connected to the tab of the wound core.

[0024] The beneficial effects of the cylindrical battery provided by the utility model are as follows: The cylindrical battery includes a battery housing, a wound core, and the above-mentioned top cover assembly. The battery housing is cylindrical, the wound core is disposed inside the battery housing, the top cover assembly is disposed at the opening of the battery housing, and the current collector plate in the top cover assembly can be connected to the tab on the wound core, so that the terminal can be electrically connected to the wound core. By providing the above-mentioned top cover assembly in the cylindrical battery, the assembly quality of the cylindrical battery can be improved, the top cover and the battery housing can be prevented from loosening during use, and thus the use safety and reliability of the cylindrical battery are enhanced. Description of the Drawings

[0025] Figure 1 is a cross-sectional view of an existing cylindrical battery;

[0026] Figure 2 is an exploded cross-sectional view of an existing cylindrical battery;

[0027] Figure 3 is a cross-sectional view of the cylindrical battery provided by the embodiment of the utility model;

[0028] Figure 4 is Figure 3 a partial enlarged view of part A in

[0029] Figure 5 is a partial structural schematic diagram of the cover plate provided by Embodiment 1 of the utility model;

[0030] Figure 6 is a partial structural schematic diagram of the cover plate provided by Embodiment 2 of the utility model.

[0031] In the figure:

[0032] 100, assembly area;

[0033] 10, battery housing; 20, top cover assembly;

[0034] 1, cover plate; 11, cover plate body; 111, second assembly surface; 1111, second clamping block; 12, bending part; 121, first assembly surface; 1211, first clamping block; 122, avoidance groove; 1221, arc surface. Detailed Embodiments

[0035] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0036] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0037] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and over", and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and under", and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0038] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] The following will be combined with Figures 1 to 6 Describe the specific structure of the cover plate 1 of the cylindrical battery according to the embodiment of the present utility model. The cylindrical battery includes a battery housing, a wound core, and a top cover assembly. A wound core is arranged inside the battery housing. The top cover assembly includes the above-mentioned cover plate 1. The top cover assembly is hermetically covered at the opening of the battery housing, and the fixed connection between the top cover assembly and the battery housing is realized through the cover plate 1.

[0040] Specifically, in this embodiment, in combination with Figures 2 to 5As shown, the cover plate 1 includes a cover plate body 11 and a bending part 12. Among them, components such as pole columns, adapter plates, and current collector plates are installed on the cover plate body 11. An end of the cover plate body 11 is provided with a bending part 12 in a horizontally outward direction. The setting of the bending part 12 can enhance the rigidity and strength of the cover plate body 11, so that the cover plate body 11 can better withstand the stress and pressure inside the winding core, thereby preventing the cover plate body 11 from deforming or being damaged during use. It should be noted that the bending part 12 is usually integrally formed with the cover plate body 11 by stamping, so as to ensure the tightness of the connection between the two, and at the same time, it can save manpower and costs in the production process.

[0041] After the cover plate 1 is formed by stamping, a first assembly surface 121 is formed at the bottom of the bending part 12, and a second assembly surface 111 is formed on the outer side wall of the cover plate body 11. The first assembly surface 121 and the second assembly surface 111 jointly enclose an assembly area for assembling the side wall of the battery case 10. When the cover plate 1 is formed by die stamping, there is an arc R at the connecting corner of the first assembly surface 121 and the second assembly surface 111. However, with the continuous increase of the single-cell capacity of the power battery, in order to ensure the safety of the battery, the thickness of the cover plate 1 is getting larger and larger, and the arc R also increases with the increase of the thickness of the cover plate 1. This results in that the battery case 10 and the cover plate 1 cannot be properly installed in place when they are fitted together, thus affecting the performance of the product and also bringing difficulties to subsequent welding.

[0042] Based on this, in this embodiment, a relief groove 122 is recessed inward in a part of the first assembly surface 121 close to the second assembly surface 111. When the cover plate 1 is formed by stamping, the relief groove 122 is formed. At this time, the arc surface 1221 formed between the bottom of the relief groove 122 and the second assembly surface 111 is the above-mentioned arc R, and the end of the arc surface 1221 and the first assembly surface 121 are located on different horizontal planes, that is, the arc surface 1221 is lifted by a certain height. Through the above setting, the relief groove 122 can play a role in avoidance. When the battery case 10 is inserted into the assembly area, the inner side wall and the top surface of the battery case 10 can be respectively closely attached to the first assembly surface 121 and the second assembly surface 111, so that the battery case 10 can be installed in place, which not only reduces the subsequent welding difficulty, but also can effectively improve the connection strength between the cover plate 1 and the battery case 10.

[0043] Further, in this embodiment, refer to Figure 5As shown, the groove depth range of the clearance groove 122 is 0.06 mm to 0.1 mm. For example, the groove depth dimensions of the clearance groove 122 include but are not limited to 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, and 0.1 mm. It should be noted that if the groove depth dimension of the clearance groove 122 is less than 0.06 mm, the depth of the clearance groove 122 will be insufficient, and it will not be able to play the role of allowing the arc surface 1221 to avoid the assembly of the battery housing 10; if the groove depth dimension of the clearance groove 122 is greater than 0.1 mm, it will be unfavorable for the long-term use of the mold, and at the same time, the bending part 12 will become thinner, resulting in weakened strength. Exemplarily, in this embodiment, the groove depth a of the clearance groove 122 is 0.08 mm.

[0044] Furthermore, in this embodiment, the length range of the bottom of the clearance groove 122 is 0.2 mm to 0.3 mm. For example, the length dimensions of the bottom of the clearance groove 122 include but are not limited to 0.2 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, 0.29 mm, and 0.3 mm. It should be noted that if the length dimension of the bottom of the clearance groove 122 is less than 0.2 mm, it will be difficult to precisely control the dimensions during the operation of the mold, thereby affecting the product consistency of the produced cover plate 1; if the length dimension of the bottom of the clearance groove 122 is greater than 0.3 mm, it will affect the structural strength of the bending part 12 and easily cause the bending part 12 to deform. Exemplarily, in this embodiment, the length dimension b of the bottom of the clearance groove 122 is 0.25 mm.

[0045] Optionally, in this embodiment, the radian size range of the arc surface 1221 is 0.05° to 0.15°. For example, the radian sizes of the arc surface 1221 can be: 0.05°, 0.06°, 0.07°, 0.08°, 0.09°, 0.1°, 0.11°, 0.12°, 0.13°, 0.14°, 0.15°. Limited by the mold processing technology, it is difficult to achieve less than 0.05°, and greater than 0.05° will affect the formation of the clearance groove 122. Preferably, in this embodiment, the radian size α of the arc surface 1221 is 0.1°.

[0046] Optionally, in this embodiment, the cross-sectional shape of the clearance groove 122 is trapezoidal, and one of its sides is vertical and the other side is inclined. Along the direction of going deep into the clearance groove 122, the opening cross-sectional area of the clearance groove 122 gradually decreases. By setting the clearance groove 122 with a gradually changing edge, it is possible to prevent excessive deformation of the bending part 12 and help maintain the flatness of the inner wall surface of the clearance groove 122.

[0047] It should be noted that in some other parallel embodiments, the cross-sectional shape of the avoidance groove 122 can also be a rectangular shape. The mold for manufacturing the rectangular avoidance groove 122 is simpler and usually only requires straight cutting or simple stamping operations to achieve. Compared with the trapezoidal avoidance groove 122, it is easier to implement and has a lower cost. Therefore, those skilled in the art can select the specific cross-sectional shape of the avoidance groove 122 according to actual needs, and the present utility model does not limit this.

[0048] Optionally, in this embodiment, a first clamping block 1211 is protrudingly provided on the first assembly surface 121, and a first clamping groove is provided at the top of the battery housing 10. When the battery housing 10 is inserted into the assembly area, the first clamping block 1211 can slide into and be inserted and limited in the first clamping groove, so as to restrict the battery housing 10 from moving horizontally through the first clamping block 1211 and the first clamping groove, and ensure the stability when the battery housing 10 and the cover plate 1 are welded.

[0049] Specifically, in this embodiment, the first clamping block 1211 is a semi-circular protruding block, and the first clamping groove is a semi-circular groove, so as to facilitate the first clamping block 1211 to slide into and be inserted into the first clamping groove.

[0050] It should be noted that the first clamping block 1211 can be fixedly connected to the bending part 12 by means of integral molding, welding or bonding, etc. The present utility model does not limit this. As long as the installation firmness of the first clamping block 1211 can be ensured and the processing cost is saved, the forming method of the first clamping block 1211 provided on the bending part 12 is within the protection scope of the present utility model.

[0051] This embodiment also provides a top cover assembly, which includes a pole column, a connecting piece, a current collecting plate and the above-mentioned cover plate 1. Among them, a pole column is provided at the center position of the cover plate 1. One end of the connecting piece is connected to the center of the cover plate 1, and the other end of the connecting piece is connected to the current collecting plate. The current collecting plate is used to electrically connect the pole column and the battery cell. In the top cover assembly provided in this embodiment, due to the provision of the cover plate 1, the avoidance groove 122 on the cover plate 1 can avoid the battery housing 10, so that the battery housing 10 can be accurately inserted into the preset position of the assembly area 100, thereby avoiding assembly errors and improving the assembly accuracy and product stability of the top cover assembly.

[0052] This embodiment also provides a cylindrical battery, including a battery housing 10, a wound core, and the above-mentioned top cover assembly 20. The battery housing 10 is cylindrical, the wound core is disposed within the battery housing 10, and the top cover assembly 20 is disposed at the opening of the battery housing 10. The current collector plate in the top cover assembly 20 can be connected to the tab on the wound core, enabling the terminal to be electrically connected to the wound core. By providing the above-mentioned top cover assembly 20 in the cylindrical battery, the assembly quality of the cylindrical battery can be improved, preventing the top cover assembly 20 and the battery housing 10 from becoming loose during use, thereby enhancing the safety and reliability of the cylindrical battery during use.

[0053] Embodiment 2

[0054] This embodiment provides a cover plate 1. The structure of the cover plate 1 is substantially the same as that of the cover plate 1 in Embodiment 1. The difference is that in this embodiment, as Figure 6 shown, a second engaging block 1111 further protrudes from the second assembly surface 111. The inner sidewall of the battery housing 10 is recessed inwardly with a second engaging groove. When the battery housing 10 is inserted into the assembly area, the second engaging block 1111 can slide into and be inserted into the second engaging groove in a limiting manner, so as to restrict the battery housing 10 from moving in the vertical direction through the second engaging block 1111 and the second engaging groove, thereby further improving the welding quality between the battery housing 10 and the cover plate 1.

[0055] Of course, it can be understood that considering the processing cost and process complexity, in other parallel embodiments, only the first engaging block 1211 can be provided on the first assembly surface 121, and the first engaging groove can be provided at the top end of the battery housing 10; or only the second engaging block 1111 can be provided on the second assembly surface 111, and the second engaging groove can be provided on the outer side surface of the battery housing 10, as long as it can ensure that the battery housing 10 and the cover plate 1 can maintain stable positioning during welding.

[0056] In the description of this specification, the descriptions referring to terms such as "some embodiments" and "other embodiments" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0057] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. Cover plate, characterized in that, It includes a cover plate body (11) and a bending part (12). The cover plate body (11) is used to seal the opening of the battery housing (10). The end of the cover plate body (11) is provided with the bending part (12) along the horizontally outward direction. The bending part (12) has a first assembly surface (121), and the cover plate body (11) has a second assembly surface (111). The first assembly surface (121) and the second assembly surface (111) jointly enclose an assembly area (100) for assembling the side wall of the battery housing (10). And a relief groove (122) is concavely provided inwardly on the part of the first assembly surface (121) close to the second assembly surface (111). An arc surface (1221) is formed between the bottom of the relief groove (122) and the second assembly surface (111). And the end of the arc surface (1221) and the first assembly surface (121) are located on different horizontal planes.

2. The cover plate according to claim 1, characterized in that, The groove depth range of the relief groove (122) is 0.06 mm to 0.1 mm.

3. The cover plate according to claim 1, wherein The radian range of the arc surface (1221) is 0.05° to 0.15°.

4. The cover plate according to claim 1, wherein The length range of the bottom of the relief groove (122) is 0.2 mm to 0.3 mm.

5. The cover plate according to any one of claims 1-4, characterized in that, A first clamping block (1211) protrudes from the first assembly surface (121). A first clamping groove is provided on the battery housing (10). When the battery housing (10) is located in the assembly area (100), the first clamping block (1211) can slide into and be limitedly inserted into the first clamping groove. And / or, a second clamping block (1111) protrudes from the second assembly surface (111). A second clamping groove is provided on the battery housing (10). When the battery housing (10) is located in the assembly area (100), the second clamping block (1111) can slide into and be limitedly inserted into the second clamping groove.

6. The cover plate according to claim 5, characterized in that, The cross-section of the first clamping block (1211) and the first clamping groove is semi-circular. And / or, the cross-section of the second clamping block (1111) and the second clamping groove is semi-circular.

7. The cover plate according to claim 5, wherein The first clamping block (1211) is integrally formed with the cover plate (1); or, the first clamping block (1211) is connected to the bending part (12) by welding; or, the first clamping block (1211) is connected to the bending part (12) by bonding.

8. The cover plate according to any one of claims 1-4, characterized in that, The relief groove (122) is a U-shaped groove or a trapezoidal groove.

9. Top cover assembly (20), characterized in that, It includes a pole column, a transition piece, a current collector plate, and the cover plate (1) according to any one of claims 1-7. The pole column is arranged at the central position of the cover plate (1). One end of the transition piece is connected to the center of the cover plate (1), and the other end of the transition piece is connected to the current collector plate.

10. Cylindrical battery, characterized in that, It includes a battery housing (10), a wound core, and the top cover assembly (20) according to claim 9. The battery housing (10) is cylindrical. The wound core is arranged inside the battery housing (10). The top cover assembly (20) is arranged at the opening of the battery housing (10). The current collector plate of the top cover assembly (20) is connected to the tab of the wound core.

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