Cylindrical power battery

Abstract

The utility model discloses a cylindrical power battery, which comprises a collector plate and a naked battery cell, the collector plate comprises a main body part and an extension handle part extending outwards from the main body part, the main body part is electrically connected with a full tab on one side of the naked battery cell, the extension handle part is provided with a bending part, and the bending part is provided with a plurality of through holes. The extending handle part is bent from the bending part so as to be stacked above the main body part, the extending handle part is provided with a mounting end part, and one side, deviating from the main body part, of the mounting end part corresponds to a pole of the cylindrical power battery so as to be electrically connected with the pole. According to the utility model, the main body part is electrically connected with the full tab on one side of the naked battery cell, and the side, deviating from the main body part, of the extension handle part is electrically connected with the pole, so that the current collecting plate can be electrically connected with the full tab on one side of the naked battery cell and the pole only through one-time bending, the extension handle part is shorter, the cost is low, and the operation is convenient. And the cylindrical power battery is more compact, high in battery energy density and very ingenious in design.

Description

Technical Field

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

[0002] Currently, lithium-ion cylindrical power batteries and sodium-ion cylindrical power batteries are gradually becoming mainstream products in the new energy industry due to their advantages such as high energy density, good capacity consistency, and ability to support high-rate charging and discharging. More and more manufacturers are continuously pursuing the optimization of cylindrical battery structure compactness to improve energy density. However, existing power batteries have some common problems:

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

[0004] 2. The cylindrical power battery extension handle adopts a Z-shaped bend with three layers, resulting 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 cylindrical power battery to solve the problem that the extension handle of the current collector of the existing cylindrical power battery is too long and occupies too much space.

[0006] To achieve the above objectives, this utility model provides a cylindrical power battery, including a current collector and a bare cell. The current collector includes a main body and an extension shank extending outward from the main body. The main body is electrically connected to a tab on one side of the bare cell. The extension shank has a bent portion, which is bent to overlap the main body. The extension shank has a mounting end, and the side of the mounting end facing away from the main body is disposed corresponding to the terminal of the cylindrical power battery for electrical connection with the terminal.

[0007] Preferably, the two sides of the extended handle are recessed towards the inside of the extended handle to form two first bending grooves, the area between the two first bending grooves forms the bending portion, and the first bending grooves are at a predetermined distance from the main body.

[0008] Preferably, the main body has a fan-shaped structure, the main body includes an arc-shaped edge and a straight edge connected to both ends of the arc-shaped edge, one end of the extended handle is connected to the middle of the straight edge, the arc-shaped edge and the straight edge form a superior arc-shaped structure, and the main body is also provided with a central hole, the center of the central hole being the center of the circle corresponding to the arc-shaped edge.

[0009] Preferably, the main body is further provided with a downwardly recessed welding part, which is used to weld to the tab on one side of the bare cell. The welding part includes two wing-shaped areas symmetrically arranged opposite to the central hole and a dovetail fan-shaped area located between the wing-shaped areas.

[0010] Preferably, the distance between the side of the airfoil region closest to the straight edge and the diameter parallel to the straight edge is greater than or equal to 2 mm and less than or equal to 5 mm, and the distance between the side of the airfoil region closest to the straight edge and the straight edge is greater than or equal to 0.5 mm and less than or equal to 1.5 mm.

[0011] Preferably, the bare battery cell has a first radius, the distance between the first bending groove and the diameter parallel to the straight edge is a first distance, and the difference between the first radius and the first distance is greater than or equal to 3.5 mm and less than or equal to 6 mm.

[0012] Preferably, the distance between the edge of the mounting end of the extended handle and the first bending groove is a second distance, and the difference between the second distance and the first distance is greater than or equal to 3 mm and less than or equal to half of the first radius.

[0013] Preferably, each of the two wing-shaped regions has at least one first welding trajectory, the first welding trajectories in the two wing-shaped regions are symmetrically arranged relative to the central hole, and the dovetail fan-shaped region has at least one second welding trajectory.

[0014] Preferably, the two sides of the extended handle are respectively recessed towards the inside of the extended handle to form a second bending groove, the second bending groove being located at the connection between the extended handle and the main body.

[0015] Preferably, the cylindrical power battery further includes a housing and a top cover disposed on the housing, the bare battery cell is disposed inside the housing, and the terminal post is disposed on the top cover.

[0016] Compared with the prior art, this utility model achieves electrical connection between the main body and the tabs on one side of the bare cell, and between the extended handle and the terminal post on the side opposite to the main body. This allows the current collector to be electrically connected to the tabs and terminal post on the bare cell side with only one bend. The extended handle is shorter, requires less material, has lower cost, and the cylindrical power battery is more compact with higher energy density. The design is very ingenious. Attached Figure Description

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

[0018] Figure 2This is a structural diagram of the cylindrical power battery of this utility model after the current collector body and the tabs on one side of the bare cell are aligned and adapted.

[0019] Figure 3 This is a structural diagram of the cylindrical power battery of this utility model after the current collector body is welded to the tabs on one side of the bare cell.

[0020] Figure 4 This is a structural diagram of the cylindrical power battery of this utility model, in which the bare cell is placed in the casing and the extended handle is bent and connected to the terminal post on the cover.

[0021] Figure 5 This is a structural diagram of the cylindrical power battery of this utility model. 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 cylindrical power battery, including a current collector 1 and a bare cell 2. The current collector 1 includes a main body 11 and an extension handle 12 extending outward from the main body 11. The main body 11 is electrically connected to the tab on one side of the bare cell 2. The extension handle 12 has a bent portion 122. The extension handle 12 is bent from the bent portion 122 to be stacked on top of the main body 11. The extension handle 12 has a mounting end 124. The side of the mounting end 124 facing away from the main body 11 is disposed corresponding to the terminal post 5 of the cylindrical power battery to be electrically connected to the terminal post 5. Specifically, the cylindrical power battery also includes a casing 3 and a top cover 4 covering the casing 3. The bare cell 2 is disposed inside the casing 3, and the terminal post 5 is disposed on the top cover 4. The current collector 1 can be made of aluminum or copper plated with nickel, etc. When the current collector 1 is not bent, the side of the mounting end 124 facing away from the main body 11 is the same side as the side of the main body 11 that is electrically connected to the tabs of the bare cell 2. The main body 11 can be fan-shaped. The main body 11 includes an arc-shaped edge 113 and a straight edge 114 connected to both ends of the arc-shaped edge 113. The extension handle 12 One end is connected to the middle of the straight edge 114. The arc edge 113 and the straight edge 114 form a superior arc-shaped structure. The main body 11 is also provided with a central hole 112. The center of the central hole 112 is the center of the circle corresponding to the arc edge 113. The extension shank 12 is bent from the bending part 122 so that part of the extension shank 12 is stacked on top of the main body 11. The side of the main body 11 away from the extension shank 12 stacked on top of the main body 11 is electrically connected to the tab of the bare cell 2. The central hole 112 is provided corresponding to the central through hole 21 of the bare cell 2.

[0024] This utility model embodiment achieves electrical connection between the main body 11 and the tabs on one side of the bare cell 2, and between the extended handle 12 and the terminal post 5 on the side opposite to the main body 11. This allows the current collector 1 to be electrically connected to the tabs on one side of the bare cell 2 and the terminal post 5 with only one bend. The extended handle 12 is shorter, requires less material, has lower cost, and the cylindrical power battery is more compact with higher energy density. The design is very ingenious.

[0025] In this embodiment of the utility model, such as Figure 1 and Figure 5 As shown, two first bending grooves 121 are formed on both sides of the extension handle 12, which are recessed inward. A bending portion 122 is formed in the area between the two first bending grooves 121. There is a preset distance between the first bending grooves 121 and the main body 11. The two first bending grooves 121 facilitate the bending of the extension handle 12 from the first bending grooves 121 when the cylindrical power battery is installed, and make it easier to control the bending position of the extension handle 12.

[0026] In this embodiment of the invention, the main body 11 is further provided with a downwardly recessed welding portion 111. The welding portion 111 is used for welding to the tab on one side of the bare battery cell 2. The welding portion 111 includes two wing-shaped areas 1111 symmetrically arranged opposite central holes 112 and a dovetail fan-shaped area 1112 located between the wing-shaped areas 1111. Specifically, the wing-shaped areas 1111 have a fan-shaped structure, and the side of the wing-shaped areas 1111 near the straight edge 114 is parallel to the straight edge 114. Through the arrangement of the two wing-shaped areas 1111 and the dovetail fan-shaped area 1112, the welding portion 111 can be welded to the tab on one side of the bare battery cell 2 more firmly and stably.

[0027] Specifically, the distance L2 between the side of the airfoil region 1111 closest to the straight edge 114 and the diameter parallel to the straight edge 114 is greater than or equal to 2 mm and less than or equal to 5 mm, and the distance L1 between the side of the airfoil region 1111 closest to the straight edge 114 and the straight edge 114 is greater than or equal to 0.5 mm and less than or equal to 1.5 mm.

[0028] Specifically, such as Figure 2 As shown, the bare cell 2 has a first radius, the distance between the first bending groove 121 and the diameter parallel to the straight edge 114 is a first distance L3, the difference between the first radius and the first distance L3 is greater than or equal to 3.5 mm and less than or equal to 6 mm, and the first radius is half the diameter D of the bare cell.

[0029] Specifically, the distance between the edge of the mounting end 124 of the extension handle 12 and the first bending groove 121 is the second distance L4. The difference between the second distance L4 and the first distance L3 is greater than or equal to 3 mm and less than or equal to half of the first radius, which effectively shortens the length of the extension handle 12. This is a clever design.

[0030] In this embodiment of the utility model, such as Figure 3 As shown, each of the two wing-shaped regions 1111 has at least one first welding trajectory 61, and the first welding trajectories 61 in the two wing-shaped regions 1111 are symmetrically arranged relative to the central hole 112. The dovetail fan-shaped region 1112 has at least one second welding trajectory 62. Specifically, there are multiple evenly distributed first welding trajectories 61 and multiple evenly distributed second welding trajectories 62. The arrangement of the first welding trajectories 61 and the second welding trajectories 62 facilitates the welding connection between the welding part 111 and the tab on one side of the bare cell 2.

[0031] In this embodiment of the invention, the two sides of the extension handle 12 are respectively recessed into the inner side of the extension handle 12 to form a second bending groove 123, which is located at the connection between the extension handle 12 and the main body 11. The second bending groove 123 facilitates bending the extension handle 12 from the second bending groove 123 when welding it to the pole post 5, thereby allowing the extension handle 12 to be set completely vertically, providing more welding operation space between the extension handle 12 and the pole post 5 located on the top cover 4. This design is ingenious.

[0032] The assembly method of the cylindrical power battery in this embodiment of the utility model is as follows: First, the main body 11 of the current collector 1 is fitted with the full tab of the bare cell 2. The full tab is fixed by laser welding through the two wing-shaped areas 1111 and the dovetail fan-shaped area 1112. Then, the bare cell 2 with the current collector 1 is installed into the housing 3. The extension shank 12 is L-shaped bent at the second bending groove 123 so that the extension shank 12 is vertical relative to the main body 11. The extension shank 12 is welded and fixed to the pole 5 of the top cover 4. Then, the extension shank 12 is U-shaped single bent along the first bending groove 121. At the same time, the top cover 4 is pressed down, and the extension shank 12 completes the U-shaped single bending forming.

[0033] This embodiment of the utility model achieves welding and fixing of the main body 11 of the current collector 1 to the bare cell 2 through the design of the extension handle 12, the first bending groove 121, the second bending groove 123, the wing-shaped area 1111, and the dovetail fan-shaped area 1112 of the current collector 1 of the cylindrical power battery. The extension handle 12 of the current collector 1 is L-shaped bent at the second bending groove 123 to assist the extension handle 12 to stand upright and be welded to the pole 5 on the top cover 4. The first bending groove 121 assists the extension handle 12 to perform a U-shaped single bend, and the final length of the extension handle 12 is... To effectively shorten the length, one end of the main body 11 of the current collector 1 can be welded and fixed to the bare cell 2 with the assistance of the welding part 111. The mounting end 124 of the extension handle 12 can be welded and fixed to the pole 5 on the top cover 4 with the assistance of the second bending groove 123. Finally, the extension handle 12 is bent by the assistance of the first bending groove 121, which ensures the feasibility of the U-shaped single bending of the current collector 1. The U-shaped single bending is used to shorten the length of the extension handle 12 of the current collector 1, reduce the manufacturing cost of the cylindrical battery, reduce the number of bending layers, save space and improve the energy density of the battery.

[0034] 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 cylindrical power battery, characterized in that, The device includes a current collector and a bare battery cell. The current collector includes a main body and an extension shank extending outward from the main body. The main body is electrically connected to a tab on one side of the bare battery cell. The extension shank has a bent portion, which is bent to overlap the main body. The extension shank has a mounting end, which is disposed on the side opposite to the main body to correspond to the terminal of the cylindrical power battery and electrically connected to the terminal.

2. The cylindrical power battery as described in claim 1, characterized in that, The two sides of the extended handle are recessed towards the inside of the extended handle to form two first bending grooves. The area between the two first bending grooves forms the bending portion. The first bending grooves are at a predetermined distance from the main body.

3. The cylindrical power battery as described in claim 2, characterized in that, The main body has a fan-shaped structure, including an arc-shaped edge and a straight edge connected to both ends of the arc-shaped edge. One end of the extended handle is connected to the middle of the straight edge. The arc-shaped edge and the straight edge form a superior arc-shaped structure. The main body is also provided with a central hole, the center of which is the center of the circle corresponding to the arc-shaped edge.

4. The cylindrical power battery as described in claim 3, characterized in that, The main body is also provided with a downwardly recessed welding part, which is used to weld and connect with the full electrode tab on one side of the bare cell. The welding part includes two wing-shaped areas symmetrically arranged opposite to the central hole and a dovetail fan-shaped area located between the wing-shaped areas.

5. The cylindrical power battery as described in claim 4, characterized in that, The distance between the side of the airfoil region closest to the straight edge and the diameter parallel to the straight edge is greater than or equal to 2 mm and less than or equal to 5 mm, and the distance between the side of the airfoil region closest to the straight edge and the straight edge is greater than or equal to 0.5 mm and less than or equal to 1.5 mm.

6. The cylindrical power battery as described in claim 5, characterized in that, The bare cell has a first radius, the distance between the first bending groove and the diameter parallel to the straight edge is a first distance, and the difference between the first radius and the first distance is greater than or equal to 3.5 mm and less than or equal to 6 mm.

7. The cylindrical power battery as described in claim 6, characterized in that, The distance between the edge of the mounting end of the extended handle and the first bending groove is the second distance, and the difference between the second distance and the first distance is greater than or equal to 3 mm and less than or equal to half of the first radius.

8. The cylindrical power battery as described in claim 4, characterized in that, Both of the aforementioned airfoil regions have at least one first welding trajectory, and the first welding trajectories in the two aforementioned airfoil regions are symmetrically arranged relative to the central hole. The dovetail fan-shaped region has at least one second welding trajectory.

9. The cylindrical power battery as described in claim 1, characterized in that, The two sides of the extended handle are respectively recessed into the inside of the extended handle to form a second bending groove, which is located at the connection between the extended handle and the main body.

10. The cylindrical power battery as described in claim 1, characterized in that, The cylindrical power battery also includes a housing and a top cover on the housing, the bare cells are disposed inside the housing, and the terminals are disposed on the top cover.

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