Power battery

Abstract

The utility model discloses a power battery which comprises a naked battery cell and a current collecting plate, the current collecting plate is provided with a first part and a second part integrally arranged with the first part, a bending part is arranged between the first part and the second part, and the second part is bent from the bending part so as to be stacked on the first part. The surface, deviating from the second part, of the first part is in welded connection with a full tab on one side of the naked battery cell, the second part is provided with a mounting end part, the surface, deviating from the first part, of the mounting end part is in welded connection with a pole of the power battery, and a convex rib part is further arranged on the side surface, facing the first part, of the second part and extends in the length direction of the second part. According to the utility model, the second part is overlapped on the first part by bending the bending part once, so that the length of the collector plate is shortened, the cost is saved, the occupied space is smaller, the energy density of the power battery is higher, and in addition, the convex rib part is positioned between the first part and the second part and extends along the length direction of the second part; and the safety risk caused by the fact that the bent bending part sinks and is inserted into the bare battery cell can be effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and more particularly to a power battery. Background Technology

[0002] Currently, lithium-ion / sodium-ion cylindrical batteries are gradually becoming the mainstream product in the new energy industry due to their advantages such as high energy density, good capacity consistency, and ability to support high-rate charge and discharge. More and more manufacturers are continuously pursuing the optimization of cylindrical battery structure compactness to improve energy density. Common questions:

[0003] 1. The conventional current collector extension shank of cylindrical power batteries is Z-shaped, which makes the extension shank longer, requires more materials, and has a higher cost.

[0004] 2. The cylindrical power battery extension handle adopts a Z-shaped bend and has three layers, which results in a large waste of internal battery space and low battery energy density. Summary of the Invention

[0005] The purpose of this utility model is to provide a power battery to solve the problems of high cost and large space occupation caused by the Z-shaped bending of the current collector in the prior art.

[0006] To achieve the above objectives, this utility model provides a power battery, including a bare cell and a current collector. The current collector has a first part and a second part integrally formed with the first part. A bending portion is provided between the first part and the second part. The second part is bent from the bending portion to be stacked on the first part. The side of the first part facing away from the second part is welded to a tab on one side of the bare cell. The second part has a mounting end. The side of the mounting end facing away from the first part is welded to a terminal post of the power battery. A rib is also provided on the side of the second part facing the first part. The rib extends along the length direction of the second part.

[0007] Preferably, there are two ribs, which are respectively located on both sides of the second part in the width direction.

[0008] Preferably, the rib portion has a first end away from the mounting end and a second end opposite to the first end, and the second portion is bent from the first end of the rib portion to form a second portion superimposed on the first portion.

[0009] Preferably, when the collector plate is not bent, the collector plate has a plate-like structure. The plate-like collector plate is provided with a spacer slit. The spacer slit has a U-shaped structure and includes a first slit, a second slit opposite to the first slit, and a third slit connecting one end of the first slit and one end of the second slit. The third slit is located near the rib.

[0010] Preferably, the first end of the rib extends to the outside of the first slit or the second slit.

[0011] Preferably, the mounting end is welded to the pole to form a weld, which is a circular weld or a strip weld.

[0012] Preferably, the second end of the rib extends beyond at least a portion of the weld so that at least a portion of the weld is located between the two ribs.

[0013] Preferably, the distance between the first edge of the weld that is away from the outer edge of the mounting end and the edge of the second end of the rib is greater than or equal to 1 mm.

[0014] Preferably, the first part is further provided with a through hole corresponding to the center hole of the bare battery cell, and the interval slit is located on the side of the through hole near the mounting end.

[0015] Preferably, the mounting end has an inwardly contracting portion, and the outer edge of the contracting portion is the outer edge of the mounting end.

[0016] Compared with the prior art, this utility model designs a first part for welding the tabs on one side of the bare cell and a second part for welding the terminal post. By bending the second part once at the bending section to stack it on the first part, the length of the current collector is shortened, saving costs. Since the current collector only needs to be bent once at the bending section to achieve the welding connection of the tabs on one side of the bare cell and the welding connection of the terminal post, it occupies less space and the energy density of the power battery is greater. In addition, the rib is located between the first part and the second part and extends along the length of the second part, which can effectively avoid the safety risk caused by the bending section sinking and inserting into the bare cell after bending. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the current collector in the power battery of this utility model embodiment. At this time, the current collector is not bent.

[0018] Figure 2 for Figure 1 The diagram shows the structure after the first part of the current collector is welded to the tab on one side of the bare cell.

[0019] Figure 3 for Figure 1 The structural diagram of the second part of the collector plate after welding with the pole post.

[0020] Figure 4 This is a cross-sectional view of the power battery according to an embodiment of the present invention.

[0021] Figure 5This is a three-dimensional structural diagram of the current collector in the power battery according to an embodiment of the present invention. At this point, the current collector has been bent. Detailed Implementation

[0022] To explain in detail the technical content, structural features, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0023] like Figures 1 to 5 As shown, this utility model embodiment provides a power battery 10, including a bare cell 2 and a current collector 1. The current collector 1 has a first part 11 and a second part 12 integrally formed with the first part 11. A bending part 13 is provided between the first part 11 and the second part 12. The second part 12 is bent from the bending part 13 to be stacked on the first part 11. The side of the first part 11 facing away from the second part 12 is welded to the tab on one side of the bare cell 2. The second part 12 has a mounting end 122. The side of the mounting end 122 facing away from the first part 11 is welded to the terminal post 5 of the power battery 10. The side of the second part 12 facing the first part 11 is also provided with a rib 121, which extends along the length direction of the second part 12. Specifically, the power battery 10 includes a housing 3 and a top cover 4 covering the housing 3. The bare battery cell 2 and the current collector 1 are disposed inside the housing 3. The terminal post 5 is located in the middle of the top cover 4. The second part 12 is bent once at the bending portion 13 to overlap the first part 12. When the current collector 1 is not bent, the side of the first part 11 facing away from the second part 12 and the side of the mounting end 122 facing away from the first part 11 are on the same side of the current collector 1. There are two ribs 121, each located on one side of the width of the second part 12. The symmetrical arrangement of the two ribs 121 makes the reinforcing strength of the ribs 121 more stable, further preventing the bent portion 13 from sinking and being inserted backwards into the bare battery cell 2 after bending. Of course, in some other embodiments, the ribs 121 can be one, three, or more, depending on the actual needs of the design.

[0024] This utility model embodiment is designed with a first part 11 for welding to the tabs on one side of the bare cell 2 and a second part 12 for welding to the terminal post 5. By bending the second part 12 once at the bending part 13 to stack it on the first part 11, the length of the current collector 1 is shortened, saving costs. Since the current collector 1 only needs to be bent once at the bending part 13 to achieve welding connection of the tabs on one side of the bare cell 2 and welding connection of the terminal post 5, it occupies less space and the energy density of the power battery 10 is greater. In addition, the rib part 121 is located between the first part 11 and the second part 12 and the rib part 121 extends along the length direction of the second part 12, which can effectively avoid the safety risk caused by the bending part 13 sinking and inserting into the bare cell 2 after bending.

[0025] In this embodiment of the utility model, such as Figure 1and Figure 3 As shown, the rib portion 121 has a first end 1211 away from the mounting end 122 and a second end 1212 opposite to the first end 1211. The second part 12 is bent from the first end 1211 of the rib portion 121 to form a second part 12 superimposed on the first part 11. The arrangement of the rib portion 121 can also control the bending of the second part 12 from the rib portion 121, that is, the specific position of the bent part 13 can be controlled, which is a very ingenious design.

[0026] In this embodiment of the utility model, such as Figures 1 to 2 As shown, when the collector plate 1 is not bent, it has a plate-like structure. The plate-like collector plate 1 has a U-shaped slit 14, which includes a first slit 141, a second slit 142 opposite to the first slit 141, and a third slit 143 connecting one end of the first slit 141 and one end of the second slit 142. The third slit 143 is located near the protruding rib 121. Specifically, as shown... Figures 1 to 5 As shown, the portion of the current collector 1 surrounded by the slit 14 is the first region 111. The portion of the current collector 1 outside the first region 111, from the first end 1211 of the rib 121 to the mounting end 122, and the mounting end 122 form the second part 12. The bent part 13 is located on one side of the second part 12 and is the area used for bending. The area on the current collector 1 excluding the second part 12 and the bent part 13 is the first part 11. During assembly of the power battery 10, the first part 11 and the tabs of the bare cell 2 are firstly welded. The specific welding locations are distributed in the first region 111 and the area on the side of the first region 111 away from the mounting end 122, i.e., the first... The specific welding position between part 11 and the tab of bare cell 2 will not occupy the current collector 1 area on both sides of the first area 111. After the first part 11 of current collector 1 is welded to the tab on one side of bare cell 2, the bare cell 2 with current collector 1 is installed into the housing 3, and the second part 12 is pulled upward to be vertical to be welded to the pole 5 on the top cover 4. Through the setting of the interval slit 14, current collector 1 will be bent from the other end of the first slit 141 and the second slit 142 and the first part 11 will be lifted upward, so that the second part 12 can be lifted to a higher height, thus giving the second part 12 more operating space when welding to the pole 5. The design is ingenious.

[0027] In this embodiment of the utility model, such as Figure 1 and Figure 3 As shown, the first end 1211 of the rib portion 121 extends to the outside of the first slit 141 or the second slit 142. By setting the length of the rib portion 121 on both sides of the first slit 141 and the second slit 142, the area of ​​the bending portion 13 can be reduced, making it easier for the second portion 12 to bend along the bending portion 13.

[0028] In this embodiment of the invention, the mounting end 122 is welded to the pole post 5 to form a weld 6, which is either a circular weld or a strip weld. Specifically, the mounting end 122 is configured to correspond to the dimensions of the pole post 5, as shown below. Figure 3 As shown, the weld 6 between the mounting end 122 and the pole post 5 is circular. In some other embodiments, the weld 6 can also be a weld 6 of other shapes, such as a strip weld 6. The specific form of the weld 6 is not limited.

[0029] In this embodiment of the utility model, such as Figure 3 As shown, the second end 1212 of the rib portion 121 extends beyond at least a portion of the weld 6 so that at least a portion of the weld 6 is located between the two rib portions 121. Specifically, the distance L between the first edge of the weld 6 away from the outer edge of the mounting end 122 and the edge of the second end 1212 of the rib portion 121 is greater than or equal to 1 mm. By extending the second end 1212 of the rib portion 121 beyond at least a portion of the weld 6, a structurally stable triangular structure is formed between at least a portion of the weld 6 and the second ends 1212 of the two rib portions 121, further ensuring that the bent portion 13 will not sink, effectively ensuring the safety of the power battery 10.

[0030] In this embodiment of the utility model, such as Figure 1 As shown, the first part 11 is also provided with a through hole 112 corresponding to the center hole 21 of the bare cell 2, and the spacer slit 14 is located on the side of the through hole 112 near the mounting end 122. Specifically, by placing the spacer slit 14 on the side of the mounting end 122 of the through hole 112, the area of ​​the first part 11 is larger, ensuring more welding area and welding space with the full tab on one side of the bare cell 2.

[0031] In this embodiment of the utility model, such as Figure 1 As shown, the mounting end 122 has an inwardly contracting portion 123, the outer edge of which is the outer edge of the mounting end 122. The design of the contracting portion 123 facilitates the connection between the pole post 5 and the mounting end 122 and saves materials.

[0032] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the present utility model application shall still fall within the scope of the present utility model.

Claims

1. A power battery, characterized in that, The device includes a bare battery cell and a current collector. The current collector has a first part and a second part integrally formed with the first part. A bending portion is provided between the first part and the second part. The second part is bent from the bending portion to be stacked on the first part. The side of the first part facing away from the second part is welded to the tab on one side of the bare battery cell. The second part has a mounting end. The side of the mounting end facing away from the first part is welded to the terminal post of the power battery. The side of the second part facing the first part is also provided with a rib. The rib extends along the length direction of the second part.

2. The power battery as described in claim 1, characterized in that, There are two convex ribs, which are respectively located on both sides of the second part in the width direction.

3. The power battery as described in claim 2, characterized in that, The rib portion has a first end away from the mounting end and a second end opposite to the first end, and the second portion is bent from the first end of the rib portion to form a second portion superimposed on the first portion.

4. The power battery as described in claim 3, characterized in that, When the collector plate is not bent, the collector plate has a plate-like structure. The plate-like collector plate is provided with a spacer slit. The spacer slit has a U-shaped structure and includes a first slit, a second slit opposite to the first slit, and a third slit connecting one end of the first slit and one end of the second slit. The third slit is located near the rib.

5. The power battery as described in claim 4, characterized in that, The first end of the rib extends to the outside of the first slit or the second slit.

6. The power battery as described in claim 4, characterized in that, The mounting end is welded to the pole to form a weld, which is either a circular weld or a strip weld.

7. The power battery as described in claim 6, characterized in that, The second end of the rib extends beyond at least part of the weld so that at least part of the weld is located between the two ribs.

8. The power battery as described in claim 7, characterized in that, The distance between the first edge of the weld, which is away from the outer edge of the mounting end, and the edge of the second end of the rib is greater than or equal to 1 mm.

9. The power battery as described in claim 4, characterized in that, The first part is also provided with a through hole corresponding to the center hole of the bare battery cell, and the interval slit is located on the side of the through hole near the mounting end.

10. The power battery as described in claim 1, characterized in that, The mounting end has an inwardly contracting portion, and the outer edge of the contracting portion is the outer edge of the mounting end.

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