Cylindrical rechargeable battery and positive collector plate thereof
By designing the epitaxial arm and auxiliary bending boss on the positive electrode current collecting disk of the lithium-ion cylindrical battery, the problems of short circuit and sliding after welding are solved, the welding strength and earthquake resistance are improved, and the stability and reliability of the battery are ensured.
Patent Information
- Application Number
- CN202420526362.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-18
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-03-18
AI Technical Summary
The positive electrode current collecting disk of lithium-ion cylindrical battery is prone to short circuit and sliding problems after welding, resulting in short circuit or failure of the battery.
A positive electrode current collecting disk with an epitaxial arm and an auxiliary bending boss is designed, which is connected to the core through a welding boss to increase welding strength, and prevents sliding through the design of the auxiliary bending boss and an epitaxial arm.
It effectively improves the welding strength and shock resistance of the positive electrode current collecting disk and the core, prevents sliding, and ensures the stability and reliability of the battery.
Smart Images
Figure CN222191088U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of secondary batteries (such as lithium batteries), and in particular to a cylindrical rechargeable battery and a positive electrode current collecting disk thereof. Background Art
[0002] At present, lithium-ion cylindrical batteries have gradually become the mainstream products in the new energy industry due to their advantages such as high energy density and good capacity consistency. Among them, the full-collector ear / collector plate structure has been determined by more and more manufacturers as the preferred direction of cylindrical battery structure. Common problems are: (1) After the positive electrode collector plate is welded to the winding core and the cover plate respectively, it is bent in a "Z" shape. The "Z"-shaped bending requires a fixed bending position. At different bending positions, the positive electrode collector plate may contact the inner wall of the steel shell, resulting in a battery short circuit. (2) After the positive electrode collector plate is welded to the winding core and the cover plate respectively, it is bent in a "Z" shape. Therefore, during loading, transportation or roller testing, the positive electrode collector plate may slide along the "Z"-shaped front and back direction due to vibration, resulting in the laser welding point being pulled off, thereby causing the internal electrical connection of the battery to have the risk of open circuit failure.
[0003] Therefore, a cylindrical rechargeable battery and a positive electrode current collecting disk thereof are provided to overcome one or more of the above-mentioned drawbacks. Utility Model Content
[0004] One purpose of the utility model is to provide a positive electrode current collecting plate of a cylindrical rechargeable battery, which can increase the welding strength on the one hand and prevent sliding during vibration on the other hand.
[0005] Another object of the utility model is to provide a cylindrical rechargeable battery, which can increase the welding strength on the one hand and prevent sliding during vibration on the other hand.
[0006] To achieve the above-mentioned purpose, the positive electrode current collector disk of the cylindrical rechargeable battery of the utility model is suitable for being welded on both the winding core and the cover plate in the cylindrical rechargeable battery, and comprises a disk body and an extension arm connected to the disk body and extending outward from the side of the disk body. The disk body has a first disk surface and a second disk surface arranged in a spaced relationship in its axial direction, and the extension arm has a first end surface arranged on the same side as the first disk surface and a second end surface arranged on the same side as the second disk surface. The first end surface is provided with a welding area for welding with the cover plate, and the welding area is away from the disk body. The second end surface is provided with an auxiliary bending boss protruding from the second end surface, and the auxiliary bending boss is located between the welding area and the disk body. The second disk surface is provided with a plurality of welding bosses protruding from the second disk surface and arranged in a spaced relationship around the center line of the disk body, and the welding bosses are configured to be welded with the winding core.
[0007] Compared with the prior art, with the aid of the provision of the auxiliary bending boss, on the one hand, the position of the extension arm located between the auxiliary bending boss and the disk body is convenient for being bent when the positive electrode current collector disk of the utility model is in use; on the other hand, the auxiliary bending boss increases the axial seismic resistance of the extension arm, thereby effectively preventing the positive electrode current collector disk of the utility model from sliding along the "Z"-shaped front and rear directions; at the same time, with the aid of the welding boss, the reliability of the cooperation between the disk body and the winding core is improved, thereby increasing the welding strength between the disk body and the winding core.
[0008] Preferably, the first disk surface is flush with the first end surface, and the second disk surface is flush with the second end surface.
[0009] Preferably, the auxiliary bending boss is also arranged adjacent to the disc body, the auxiliary bending boss is a rectangular boss, the extension arm is a rectangular parallelepiped, and the length direction of the auxiliary bending boss is parallel to the length direction of the extension arm.
[0010] Preferably, the disk body has a matching groove that matches the welding boss and penetrates the first disk surface, and the extension arm has a matching groove that matches the auxiliary bending boss and penetrates the first end surface.
[0011] Preferably, the welding area is formed by a position of the first end surface away from the disk body.
[0012] Preferably, an external convex boss protruding from the first end surface is provided at a position of the first end surface away from the disk body, and the external convex boss forms the welding area.
[0013] Preferably, the external convex boss is a square boss, and the extension arm is provided with a matching groove matching the external convex boss and penetrating the second end surface.
[0014] Preferably, the welding bosses are square bosses, and all the welding bosses are arranged in a circle with equal spacing around the center line of the disk body.
[0015] Preferably, the extension arm extends in a radial straight line along the disk body, and in the projection of the positive current collecting disk along the axial direction of the disk body, the disk body has a first arcuate contour with an arc center located on the center line of the disk body, a second arcuate contour that makes an arc-shaped transition with the first arcuate contour, a third arcuate contour tangent to the extension arm, and a straight line contour tangent to the second arcuate contour and the third arcuate contour, respectively, and the straight line contour is arranged at an acute angle to the extension arm.
[0016] To achieve the above-mentioned purpose, the cylindrical rechargeable battery of the utility model comprises a winding core, a cover plate and the aforementioned positive electrode collector disk. The welding area of the extension arm is welded to the cover plate, the welding boss of the disk body is welded to the winding core, and the position of the extension arm between the welding area and the auxiliary bending boss and the position of the extension arm between the auxiliary bending boss and the disk body are bent, so that the disk body and the bent extension arm together form a "Z" shape.
[0017] Compared with the prior art, with the aid of the provision of the auxiliary bending boss, on the one hand, the position of the extension arm located between the auxiliary bending boss and the disk body is convenient for being bent when the positive electrode current collector disk of the utility model is in use; on the other hand, the auxiliary bending boss increases the axial seismic resistance of the extension arm, thereby effectively preventing the positive electrode current collector disk of the utility model from sliding along the "Z"-shaped front and rear directions; at the same time, with the aid of the welding boss, the reliability of the cooperation between the disk body and the winding core is improved, thereby increasing the welding strength between the disk body and the winding core. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a three-dimensional view of the positive electrode current collecting disk of the first embodiment of the utility model when the first disk faces upward.
[0019] Figure 2 It is a three-dimensional view of the positive electrode current collecting disk of the first embodiment of the utility model when the second disk faces upward.
[0020] Figure 3 yes Figure 2 Plan view along the direction indicated by arrow A.
[0021] Figure 4 is along Figure 3 Internal view of the section along the midline BB.
[0022] Figure 5 It is a three-dimensional view of the positive electrode current collecting disk of the second embodiment of the utility model when the second disk faces upward.
[0023] Figure 6 It is a three-dimensional diagram of a cylindrical rechargeable battery according to the first embodiment of the utility model.
[0024] Figure 7 It is a three-dimensional diagram of a cylindrical rechargeable battery according to the second embodiment of the present utility model. DETAILED DESCRIPTION
[0025] Embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals represent like elements.
[0026] See also Figure 1 and Figure 2The positive electrode current collecting disk 10 of the first embodiment comprises a disk body 11 and an extension arm 12 connected to the disk body 11 and extending outward from the side of the disk body 11. Optionally, Figure 3 In the figure, as an example, the extension arm 12 extends in a straight radial direction of the disc body 11, that is, the radial direction of the disc body 11 is a special lateral direction of the disc body 11, so that the operator can make it through a punching process on a metal sheet, thereby simplifying the manufacturing process of the positive current collecting disc 10 of the first embodiment; obviously, according to actual needs, the positive current collecting disc 10 of the first embodiment can also be made on a metal sheet by turning and milling, so the manufacturing method of the positive current collecting disc 10 of the first embodiment is not limited.
[0027] Meanwhile, the disc body 11 has a first disc surface 111 and a second disc surface 112 which are arranged in a spaced relationship in the axial direction thereof (i.e., the direction indicated by arrow A and the opposite direction), and the extension arm 12 has a first end surface 121 which is arranged on the same side as the first disc surface 111 and a second end surface 122 which is arranged on the same side as the second disc surface 112; Figure 4 As an example, the first disk surface 111 is flush with the first end surface 121, and the second disk surface 112 is flush with the second end surface 122, so as to ensure the thickness consistency of the disk body 11 and the extension arm 12. Therefore, it is more convenient for operators to make the positive electrode current collecting disk 10 of the first embodiment on a metal sheet of the same thickness. Obviously, according to actual needs, the first disk surface 111 may not be flush with the first end surface 121, and the second disk surface 112 may not be flush with the second end surface 122. Figure 4 Limits shown.
[0028] Furthermore, a welding area 1211 is provided on the first end surface 121, and the welding area 1211 is away from the disk body 11; Figure 1 and Figure 4 As an example, a convex boss protruding from the first end face 121 is provided at a position of the first end face 121 away from the disk body 11, and the convex boss forms a welding area 1211. This design makes the welding area 1211 protrude from the first end face 121, so that the first end face 121 can better contact with the cover body 30 described below by means of the convex boss, thereby increasing the welding reliability between the extension arm 12 and the cover body 30; Obviously, in other embodiments, see Figure 5 As shown, the welding area 1211' can also be formed by the position of the first end surface 121 away from the disk body 11. In addition, the second end surface 122 is provided with an auxiliary bending boss 123 protruding from the second end surface 122, and the auxiliary bending boss 123 is located between the welding area 1211 and the disk body 11. The second disk surface 112 is provided with three welding bosses 113 protruding from the second disk surface 112 and arranged around the center line C of the disk body 11. Obviously, the number of welding bosses 113 can also be selected to be two, four or five according to actual needs, so it is not limited to the number of welding bosses 113. Figure 2 and Figure 3 The limit shown is as follows; alternatively, Figure 3 As an example, all the welding bosses 113 are arranged in a circle around the center line C of the disk body 11 at equal intervals to ensure that the welding bosses 113 are evenly arranged on the disk body 11, so that the disk body 11 can better contact with the winding core 20 described below by means of the welding bosses 113, thereby increasing the welding reliability between the disk body 11 and the winding core 20. Obviously, the arrangement of all the welding bosses 113 on the disk body 11 can also be other, so it is not used in this example. Figure 3 Limits shown.
[0029] More specifically, as follows:
[0030] like Figure 3 As shown, as an example, in the projection of the positive current collector disk 10 of the first embodiment along the axial direction of the disk body 11, the disk body 11 has a first arc profile 115 with the arc center located on the center line C of the disk body 11, a second arc profile 116 with an arc transition to the first arc profile 115, a third arc profile 117 tangent to the extension arm 12, and a straight line profile 118 tangent to the second arc profile 116 and the third arc profile 117 respectively, and the straight line profile 118 is arranged at an acute angle to the extension arm 12; such a design avoids stress concentration at the connection between the disk body 11 and the extension arm 12, and also facilitates the bending operation of the extension arm 12 relative to the disk body 11 around the dotted line shown by the label 126 when the positive current collector disk 10 of the first embodiment is bent in a "Z" shape. Specifically, at Figure 3 As an example, the arc diameters of the first arc profile 115, the third arc profile 117 and the second arc profile 116 are arranged in descending order. Obviously, the arc diameters of the first arc profile 115, the second arc profile 116 and the third arc profile 117 can also be arranged in descending order. Figure 3 The following are the limits. Figure 3 As an example, the first arc profile 115, the second arc profile 116, the third arc profile 117 and the straight profile 118 are symmetrically arranged with the extension arm 12 as the center, which more reliably ensures that the extension arm 12 is bent relative to the disc body 11 around the dotted line shown by the label 126 when the positive electrode current collecting disc 10 of the first embodiment is bent in a "Z" shape. It should be noted that Figure 3 In the embodiment, the dotted line indicated by reference numeral 126 only indicates the position where the extension arm 12 is bent relative to the plate body 11, and the dotted line indicated by reference numeral 127 only indicates the position where the welding area 1211 is bent relative to the auxiliary bending boss 123; in addition, the dotted line indicated by reference numeral 126 and the dotted line indicated by reference numeral 127 can be changed according to actual needs, so they are not used as shown in FIG. Figure 3 Limits shown.
[0031] like Figure 2 and Figure 3 As shown, as an example, the auxiliary bending boss 123 is also arranged adjacent to the disc body 11, the auxiliary bending boss 123 is a rectangular boss, the extension arm 12 is a rectangular parallelepiped, and the length direction of the auxiliary bending boss 123 is parallel to the length direction of the extension arm 12; this design allows the auxiliary bending boss 123 to more effectively utilize the length position of the extension arm 12, thereby more effectively ensuring that the extension arm 12 is bent relative to the disc body 11 around the dotted line shown by the label 26. Figure 4 As an example, the disc body 11 has a matching groove 114 that matches the welding boss 113 and passes through the first disc surface 111, so that the operator can obtain the welding boss 113 and the matching groove 114 on the disc body 11 by stretching; the extension arm 12 has a matching groove 124 that matches the auxiliary bending boss 123 and passes through the first end surface 121, so that the operator can obtain the auxiliary bending boss 123 and the matching groove 124 on the extension arm 12 by stretching. Figure 4 As an example, the extension arm 12 is provided with a matching groove 125 that matches the outer convex boss (i.e., the welding area 1211) and penetrates the second end surface 122, so that the operator can obtain the outer convex boss (i.e., the welding area 1211) and the matching groove 125 on the extension arm 12 by stretching. More specifically, Figure 1 In one example, the outer convex boss is a square boss to increase the contact area of the outer convex boss; Figure 2 As an example, the welding boss 113 is a square boss to increase the contact area of the welding boss 113; obviously, according to actual needs, both the outer convex boss and the welding boss 113 can also be other shapes, so it is not limited to the figures shown.
[0032] See also Figure 5 , showing the positive electrode current collecting disc 10' of the second embodiment, the structure of the positive electrode current collecting disc 10' and the positive electrode current collecting disc 10 of the first embodiment are basically the same, and the differences are as follows:
[0033] In the positive electrode current collecting disk 10' of the second embodiment, its welding area 1211' is formed by the position of the first end surface 121 away from the disk body 11; wherein, Figure 5 The dotted line indicated by the reference numeral 128 is a dividing line; in the positive current collecting disc 10 of the first embodiment, its welding area 1211 is formed by an outer convex boss protruding from the first end face 121 at a position of the first end face 121 away from the disc body 11. Because the welding area 1211' in the positive current collecting disc 10' of the second embodiment is not formed by an outer convex boss, the auxiliary bending boss 123' can be made longer than the auxiliary bending boss 123 in the first embodiment.
[0034] Except for the above differences, the other parts are the same as the positive electrode current collecting disk 10 of the first embodiment, so they are not described here in detail.
[0035] See also Figure 6 The cylindrical rechargeable battery 100 of the first embodiment includes a winding core 20, a cover plate 30, and a positive electrode current collecting disc 10 of the first embodiment. The welding area 1211 of the extension arm 12 is welded to the cover plate 30, the welding boss 113 of the disc body 11 is welded to the winding core 20, and the extension arm 12 is bent at a position 12a between the welding area 1211 and the auxiliary bending boss 123 and at a position 12b between the auxiliary bending boss 123 and the disc body 11, so that the disc body 11 and the bent extension arm 12 together form a "Z" shape, as shown in FIG. Figure 6 shown.
[0036] See also Figure 7 The cylindrical rechargeable battery 100' of the second embodiment includes a winding core 20, a cover plate 30 and a positive current collecting disk 10' of the second embodiment. The welding area 1211' of the extension arm 12 is welded to the cover plate 30, the welding boss 113 of the disk body 11 is welded to the winding core 20, and the position 12a of the extension arm 12 between the welding area 1211' and the auxiliary bending boss 123' and the position 12b of the extension arm 12 between the auxiliary bending boss 123' and the disk body 11 are bent, so that the disk body 11 and the bent extension arm 12 together form a "Z" shape, the state is shown in FIG. Figure 7 shown.
[0037] Compared with the prior art, with the aid of the setting of the auxiliary bending boss 123 (123'), on the one hand, it is convenient for the extension arm 12 to be bent at the position 12b between the auxiliary bending boss 123 (123') and the disk body 11 when the positive electrode current collecting disk 10 (10') of the utility model is in use; on the other hand, the auxiliary bending boss 123 (123') increases the axial seismic resistance of the extension arm 20, thereby effectively preventing the positive electrode current collecting disk 10 (10') of the utility model from sliding along the "Z"-shaped front and rear directions; at the same time, with the aid of the welding boss 113, the reliability of the cooperation between the disk body 11 and the winding core 20 is improved, thereby increasing the welding strength between the disk body 11 and the winding core 20.
[0038] It should be noted that Figure 6 and Figure 7 In the figure, the "Z"-shaped front-to-back direction refers to the left-right direction in the figure. Figure 6 and Figure 7 In the figure, only the positive electrode current collector is shown welded to the cover plate and the winding core respectively and is not squeezed.
[0039] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.
Claims
1. A positive electrode current collector disc of a cylindrical rechargeable battery, suitable for being welded on both a winding core and a cover plate in the cylindrical rechargeable battery, comprising a disc body and an extension arm connected to the disc body and extending outward from the side of the disc body, wherein the disc body has a first disc surface and a second disc surface arranged in an axial direction thereof, wherein the extension arm has a first end surface arranged on the same side as the first disc surface and a second end surface arranged on the same side as the second disc surface, wherein a welding area for welding to the cover plate is provided on the first end surface, and wherein the welding area is away from the disc body, wherein the first end surface is provided with a welding area for welding to the cover plate, and wherein the welding area is away from the disc body, wherein the first end surface is provided with a welding area for welding to the cover plate, and wherein the welding area is away from the disc body, wherein the first end surface is provided with a welding area for welding to the cover plate, and wherein the welding area is away from the disc body, and ... The second end surface is provided with an auxiliary bending boss protruding from the second end surface, and the auxiliary bending boss is located between the welding area and the disk body. The second disk surface is provided with a plurality of welding bosses protruding from the second disk surface and arranged at intervals around the center line of the disk body, and the welding bosses are configured to be welded to the winding core.
2. The positive electrode current collecting disk according to claim 1, characterized in that: The first disk surface is flush with the first end surface, and the second disk surface is flush with the second end surface.
3. The positive electrode current collecting disk according to claim 1, characterized in that: The auxiliary bending boss is also arranged adjacent to the disc body, the auxiliary bending boss is a rectangular boss, the extension arm is a rectangular parallelepiped, and the length direction of the auxiliary bending boss is parallel to the length direction of the extension arm.
4. The positive electrode current collecting disk according to claim 1, characterized in that: The disc body has a matching groove that matches the welding boss and penetrates the first disc surface, and the extension arm has a matching groove that matches the auxiliary bending boss and penetrates the first end surface.
5. The positive electrode current collecting disk according to claim 1, characterized in that: The welding area is formed by a position of the first end surface away from the disk body.
6. The positive electrode current collecting disk according to claim 1, characterized in that: An external convex boss protruding from the first end surface is provided at a position of the first end surface away from the disk body, and the external convex boss forms the welding area.
7. The positive electrode current collecting disk according to claim 6, characterized in that: The external convex boss is a square boss, and the extension arm is provided with a matching groove that matches the external convex boss and penetrates the second end surface.
8. The positive electrode current collecting disk according to claim 1, characterized in that: The welding bosses are square bosses, and all the welding bosses are arranged in a circle with equal spacing around the center line of the disk body.
9. The positive electrode current collecting disk according to claim 1, characterized in that: The extended arm extends in a straight radial direction along the disk body, and in the projection of the positive current collecting disk along the axial direction of the disk body, the disk body has a first arcuate contour with an arc center located on the center line of the disk body, a second arcuate contour that is in arc-shaped transition with the first arcuate contour, a third arcuate contour tangent to the extended arm, and a straight line contour that is tangent to the second arcuate contour and the third arcuate contour respectively, and the straight line contour is arranged at an acute angle to the extended arm.
10. A cylindrical rechargeable battery, comprising a winding core and a cover plate, characterized in that: The cylindrical rechargeable battery also includes a positive electrode collector disk according to any one of claims 1 to 9, the welding area of the extension arm is welded to the cover plate, the welding boss of the disk body is welded to the winding core, and the extension arm is bent at a position between the welding area and the auxiliary bending boss and a position between the auxiliary bending boss and the disk body, so that the disk body and the bent extension arm together form a "Z" shape.