Pole and battery cell

Abstract

The invention provides a pole column and a battery cell, the pole column comprises a bottom plate and a column body arranged on one side surface of the bottom plate, the side surface of the bottom plate provided with the column body is provided with a supporting area arranged along the circumferential direction of the column body, the supporting area is used for supporting a sealing element sleeved on the column body, the supporting area divides the side surface into two side areas which are oppositely arranged, and the two side areas are arranged on the side surface of the bottom plate. And a weight reducing groove is formed in at least one side part area. According to the pole disclosed by the invention, the supporting region is arranged on the bottom plate, so that the use effect of the sealing element is ensured, the weight reduction groove is formed in at least one side region of the bottom plate, so that the weight and the production cost of the pole are reduced, the lightweight design of the battery cell is also facilitated, and the welding effect of the bottom plate and the tab is not influenced; therefore, a good using effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a pole; at the same time, the present invention also relates to a battery core provided with the pole. Background Art

[0002] The pole structure and installation on the battery cell are important components in battery technology, and they have a crucial impact on the performance and life of the battery. The poles are mainly divided into positive poles and negative poles, each of which has unique structural and material properties. The positive pole is usually made of aluminum, which has high conductivity and chemical stability. The negative pole is usually made of copper, which has low resistance and high conductivity.

[0003] At present, blade cells need to be hot-melt with the side of the plastic plate under the cover plate. In order to ensure that the pole ear is not cut by the side of the lower plastic, the bottom plate of the pole should at least be flush with the side plate of the lower plastic, or extend beyond the side plate of the lower plastic. This will cause the bottom plate of the pole to be thicker and exceed the thickness required for the welding of the pole ear, resulting in a higher production cost of the battery cell and a heavier weight of the pole, which is not conducive to the lightweighting of the battery cell. Summary of the invention

[0004] In view of this, the present invention aims to provide a pole to facilitate lightweight configuration and reduce production costs.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A pole comprises a base plate and a column arranged on one side of the base plate, wherein the side of the base plate provided with the column has a support area arranged along the circumference of the column, the support area is used to support a seal sleeved on the column, and the support area divides the side into two side areas arranged oppositely, and at least one of the side areas is provided with a weight reduction groove.

[0007] Furthermore, the weight-reducing groove is arranged in accordance with the side area.

[0008] Furthermore, relative to the column, a distance a between the other side surface of the bottom plate and the bottom of the weight-reducing groove satisfies: a≥1 mm.

[0009] Furthermore, the side region has an edge portion arranged along the edges of the weight-reducing groove.

[0010] Furthermore, a boundary line between the side area and the support area is in the shape of an arc coaxially arranged with the column.

[0011] Furthermore, the column has a first part connected to the base plate, and a second part connected to the free end of the first part, the diameter of the first part is larger than the diameter of the second part; the second part is used to pass through the output pole block and be connected to the output pole block, and the output pole block can abut against the end face of the first part.

[0012] Furthermore, the bottom plate is any one of square, circular or rectangular.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] The pole described in the present invention helps to ensure the use effect of the seal by arranging a support area on the bottom plate, and helps to reduce the weight and production cost of the pole by arranging a weight-reducing groove on at least one side area of ​​the bottom plate. It is also beneficial to the lightweight design of the battery cell and will not affect the welding effect of the bottom plate and the pole ear, thereby having a better use effect.

[0015] In addition, the weight-reducing groove is arranged in the shape of the side area, which is conducive to processing and forming, and has a good weight-reducing effect. By setting the spacing a range between the other side of the base plate and the bottom of the weight-reducing groove, it is conducive to reducing the weight of the pole to the greatest extent under the premise of ensuring the welding requirements of the base plate. The setting of the edge part is conducive to ensuring the matching effect between the pole and the lower plastic plate during installation. The dividing line between the side area and the support area is in the shape of an arc arranged coaxially with the column. On the premise of ensuring the supporting effect of the support area on the seal, it is conducive to further increasing the area of ​​the side area and the weight-reducing groove, thereby having a better weight-reducing effect. The setting of the diameter relationship between the first part and the second part is conducive to abutting against the output pole block during installation to limit the displacement of the output pole block, thereby improving the connection effect between the column and the output pole block. The setting of the shape of the base plate is conducive to the processing and forming of the base plate.

[0016] In addition, another object of the present invention is to provide a battery cell, comprising a shell with a cavity formed therein, and the shell has an end portion located at the end, a lower plastic plate arranged on the inner side of the end portion, an output pole block arranged on the outer side of the end portion, and a pole as described above, and the bottom plate is located on the inner side of the lower plastic plate, the column passes through the lower plastic plate and the end portion, and is electrically connected to the output pole block, and a seal is provided between the column and the shell.

[0017] Furthermore, the lower plastic plate is provided with a limiting groove which is arranged in the same shape as the bottom plate, and at least a part of the bottom plate accommodates the limiting groove.

[0018] Furthermore, the end portion is integrally formed with the shell, or the shell includes a shell body with an open end, the end portion includes a cover plate for sealing the open end, and the cover plate is welded to the shell body.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The battery cell of the present invention is beneficial to the lightweight design of the battery cell by arranging the above-mentioned poles.

[0021] In addition, at least part of the bottom plate is accommodated in the limiting groove arranged in the shape of the bottom plate, which is conducive to improving the installation stability of the bottom plate on the lower plastic plate. The end portion and the shell are integrally formed, which is conducive to improving processing efficiency; the arrangement of the shell body and the cover plate is conducive to meeting the arrangement requirements of the battery cell provided with the cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the pole according to the first embodiment of the present invention;

[0024] Figure 2 A top view of the pole according to the first embodiment of the present invention;

[0025] Figure 3 for Figure 2 AA direction section view;

[0026] Figure 4 This is a partial disassembly diagram of the battery cell according to the second embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of a part of the structure of the battery cell according to an embodiment of the present invention;

[0028] Figure 6 for Figure 5 BB direction cross-sectional view.

[0029] Description of reference numerals:

[0030] 1. Pole; 2. Seal; 3. Lower plastic plate; 4. End part; 5. Insulation sleeve; 6. Output pole block;

[0031] 101, bottom plate; 102, column; 1021, first part; 1022, second part; 1023, protrusion; 103, side area; 1031, weight reduction groove; 1032, edge part; 104, support area;

[0032] 301, first positioning column; 302, second positioning column;

[0033] 401. A first positioning hole. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, 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, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0037] Embodiment 1

[0038] This embodiment relates to a pole 1, which solves the problems of heavy weight and high cost of the pole 1 in the prior art by optimizing its structure.

[0039] In terms of overall structure, the pole 1 of this embodiment includes a base plate 101, and a column 102 arranged on one side of the base plate 101. The side of the base plate 101 provided with the column 102 has a support area 104 arranged along the circumference of the column 102. The support area 104 is used to support the seal 2 sleeved on the column 102, and the support area 104 divides the side into two side areas 103 arranged opposite to each other, and at least one side area 103 is provided with a weight reduction groove 1031.

[0040] The pole 1 described in this embodiment is beneficial to ensuring the use effect of the seal 2 by setting a support area 104 on the bottom plate 101, and is beneficial to reducing the thickness, weight and production cost of the bottom plate 101 by setting a weight-reducing groove 1031 on at least one side area 103 of the bottom plate 101, and is also beneficial to the lightweight design of the battery cell. The setting of the weight-reducing groove 1031 will not affect the welding effect between the bottom plate 101 and the pole ear, so that the pole 1 has a better use effect.

[0041] Based on the above overall introduction, an exemplary structure of the pole 1 in this embodiment is as follows: Figures 1 to 3As shown in . For the convenience of the following description, in this embodiment, the side of the bottom plate 101 on which the pole 1 is provided is called the outer side, and the side opposite to the outer side is called the inner side, and the inner side is used for welding with the pole lug. As a preferred embodiment, the bottom plate 101 in this embodiment is rectangular, and the column 102 is provided in the middle of the outer side. Of course, in addition to being rectangular, the bottom plate 101 can also be other geometric shapes such as square or circle.

[0042] As a preferred embodiment, Figure 1 As shown in the figure, the weight-reducing grooves 1031 are respectively arranged on the outside of each side region 103, which is conducive to further improving the weight-reducing effect of the pole 1. The side region 103 has an edge portion 1032 arranged along the edges of the weight-reducing grooves 1031. The edge portion 1032 here can be used to abut against the lower plastic plate 3, thereby ensuring the installation firmness of the bottom plate 101 on the lower plastic plate 3. In addition, the two side regions 103 can be used Figure 1 The arrangement shown in the figure is asymmetrical, but a symmetrical arrangement may also be adopted as long as the use requirements are met.

[0043] Of course, in specific implementation, it is also feasible to set a weight-reducing groove 1031 only on one side area 103. In addition, in the present embodiment, each side area 103 is provided with a weight-reducing groove 1031, and the weight-reducing groove 1031 is set in accordance with the side area 103. This is conducive to increasing the specifications of the weight-reducing groove 1031, thereby further improving the weight-reducing effect of the weight-reducing groove 1031. The solution of setting only one weight-reducing groove 1031 on a side area 103 is simple and easy to form, thereby helping to improve the forming efficiency of the pole 1. It should be noted that it is also feasible to set multiple weight-reducing grooves 1031 on each side area 103. At this time, the effect of reducing the weight of the pole 1 can also be achieved by cooperating with multiple weight-reducing grooves 1031.

[0044] Considering that the seal 2 is a sealing ring sleeved on the column 102, and the sealing ring has a radial portion located at the bottom and radially convex, and an axial portion extending along the axial direction of the column 102. The radial portion in the installed state abuts against the support area 104, so the area of ​​the support area 104 should meet the support requirements of the radial portion. Preferably, the diameter of the support area 104 is not less than the outer diameter of the radial portion.

[0045] In addition, the radial portion is generally annular, so the support area 104 is preferably also annular. As a preferred embodiment, Figure 2As shown in , the boundary line between the side area 103 and the support area 104 is in the shape of an arc coaxially arranged with the column 102. In this way, the side area 103 and the weight-reducing groove 1031 thereon can be made larger in size while satisfying the supporting effect of the support area 104 on the seal 2, which is further conducive to reducing the weight of the pole 1.

[0046] It should be noted that, in this embodiment, the outer contour of the support area 104 located on two opposite sides of the column 102 may be in a straight line or a broken line, in addition to being in an arc shape, as long as the use requirements are met. Figure 3 As shown in , relative to the column 102, the spacing a between the other side of the bottom plate 101 and the bottom of the weight-reducing groove 1031 satisfies: a ≥ 1 mm. That is, the spacing a between the bottom of the weight-reducing groove 1031 and the inner side of the bottom plate 101. In specific implementation, the spacing a can be, for example, 1 mm, 1.2 mm, 1.5 mm or 2 mm. The setting of the spacing a here should meet the requirements of welding the bottom plate 101 and the tab.

[0047] Still Figure 3 As shown in the figure, the column 102 has a first part 1021 connected to the bottom plate 101, and a second part 1022 connected to the free end of the first part 1021. The diameter of the first part 1021 is larger than the diameter of the second part 1022. The second part 1022 is used to pass through the output pole block 6 and is connected to the output pole block 6, and the output pole block 6 can abut against the end face of the first part 1021. The second part 1022 is arranged to pass through the output pole block 6, and the end face of the first part 1021 abuts against the output pole block 6 to limit the displacement of the output pole block 6 close to the bottom plate 101. In addition, the free end of the second part 1022 can be pressed by a rivet pin to form a radially outward protrusion 1023, so that the column 102 and the output pole block 6 are riveted and connected.

[0048] The pole 1 described in this embodiment is beneficial to reducing the weight of the base plate 101 on the pole 1 by setting the weight-reducing groove 1031, thereby reducing the production cost of the battery cell and facilitating the lightweight design of the battery cell. The weight-reducing groove 1031 has a simple structure, is easy to process and form, and is beneficial to ensuring the welding effect between the pole ear and the base plate 101.

[0049] Embodiment 2

[0050] This embodiment relates to a battery cell, which includes a shell with a cavity formed therein, and the shell has an end portion 4 located at the end, a lower plastic plate 3 arranged inside the end portion 4, an output pole block 6 arranged outside the end portion 4, and the pole 1 described in the first embodiment. The bottom plate 101 is located inside the lower plastic plate 3, the column 102 passes through the lower plastic plate 3 and the end portion 4, and is electrically connected to the output pole block 6, and a seal 2 is provided between the column 102 and the shell.

[0051] The specific structure is Figures 4 to 6 As shown in , the shell includes a shell body with an open end, and the end portion 4 includes a cover plate for sealing the opening, and the cover plate is welded to the shell body. Among them, the cover plate can be made of a plain aluminum sheet in the prior art, and the lower plastic plate 3 is provided with a limiting groove arranged in the shape of the bottom plate 101, and at least part of the bottom plate 101 accommodates the limiting groove. Here, the limiting groove is arranged in the shape of the bottom plate 101, which means that the cross-sectional shape and specifications of the limiting groove are consistent with the shape and specifications of the bottom plate 101. By accommodating part of the bottom plate 101 in the limiting groove, it is beneficial to improve the installation accuracy and effect of the bottom plate 101 on the lower plastic plate 3, and the structure of the limiting groove is simple and easy to process and form. It should be noted that in order to ensure that the pole ear is not cut by the side wall of the limiting groove, the thickness of the bottom plate 101 in this embodiment is not less than the depth of the limiting groove.

[0052] It should be noted that, in addition to using a cover plate, the end portion 4 can also be formed integrally with the shell, which can also meet the use requirements of some battery cells. In addition, in order to ensure the insulation effect between the output pole block 6 and the end portion 4, an insulating sleeve 5 with a mounting groove can be provided on the outside of the end portion 4, and the shape and specification of the mounting groove are consistent with the shape and specification of the output pole block 6. The column 102 of the pole 1 passes through the lower plastic plate 3, the cover plate and the insulating sleeve 5 in sequence and is riveted to the output pole block 6.

[0053] In this embodiment, the radial portion and the axial portion of the seal 2 cooperate to achieve insulation sealing between the column 102 and the radial portion. Here, the seal 2 and the insulating sleeve 5 cooperate to achieve good sealing and insulation effects. In addition, in order to improve the fixing effect of the lower plastic plate 3 on the end portion 4, a positioning portion may be provided between the lower plastic plate 3 and the end portion 4 to position the lower plastic plate 3 on the end portion 4.

[0054] As a feasible implementation method, Figure 4 As shown in , the positioning portion includes two first positioning columns 301 provided on the lower plastic plate 3 corresponding to the column 102, and a first positioning hole 401 provided on the end portion 4 corresponding to each first positioning column 301. The positioning portion may also include a second positioning column 302 provided at the other end of the lower plastic plate 3 relative to the first positioning column 301, and a second positioning hole provided on the end portion 4 corresponding to the second positioning column 302.

[0055] In this embodiment, the lower plastic plate 3 can be positioned on the end portion 4 by inserting the first positioning column 301 in the first positioning hole 401 and the second positioning column 302 in the second positioning hole. The structure of the positioning column and the positioning hole is simple, easy to arrange and implement, and has a good positioning effect. As for other structures on the lower plastic plate 3 and the end portion 4 not mentioned in this embodiment, they can all refer to the prior art and will not be repeated here.

[0056] The battery cell in this embodiment is advantageous for the lightweight design of the battery cell and for reducing the production cost of the battery cell by providing the above-mentioned pole 1.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pole, characterized in that: It includes a base plate and a column arranged on one side of the base plate, wherein the side of the base plate has a support area arranged along the circumference of the column, the support area is used to support a seal sleeved on the column, and the support area divides the side into two side areas arranged oppositely, and at least one of the side areas is provided with a weight-reducing groove.

2. The pole according to claim 1, characterized in that: The weight-reducing groove is arranged in accordance with the side area.

3. The pole according to claim 1, characterized in that: Relative to the column, a distance a between the other side surface of the bottom plate and the bottom of the weight-reducing groove satisfies: a≥1 mm.

4. The pole according to claim 1, characterized in that: The side region has an edge portion arranged along the periphery of the weight-reducing groove.

5. The pole according to claim 1, characterized in that: A boundary line between the side area and the support area is in the shape of an arc coaxially arranged with the column.

6. The pole according to claim 1, characterized in that: The column has a first portion connected to the bottom plate, and a second portion connected to a free end of the first portion, wherein a diameter of the first portion is greater than a diameter of the second portion; The second portion is used to pass through the output pole block and be connected to the output pole block, and the output pole block can abut against the end surface of the first portion.

7. The pole according to any one of claims 1 to 6, characterized in that: The bottom plate is in any of square, circular or rectangular shape.

8. A battery cell, characterized in that: It comprises a shell with a cavity formed inside, and the shell has an end portion located at the end, a lower plastic plate arranged on the inner side of the end portion, an output pole block arranged on the outer side of the end portion, and a pole as described in any one of claims 1 to 7, wherein the bottom plate is located on the inner side of the lower plastic plate, the column passes through the lower plastic plate and the end portion, and is electrically connected to the output pole block, and a seal is provided between the column and the shell.

9. The battery cell according to claim 8, characterized in that: The lower plastic plate is provided with a limiting groove which is arranged in the same shape as the bottom plate, and at least a part of the bottom plate accommodates the limiting groove.

10. The battery cell according to claim 8, characterized in that: The end portion is integrally formed with the housing, or, The shell body comprises a shell body with an open end, the end portion comprises a cover plate for sealing the open end, and the cover plate is welded to the shell body.

Images