Battery cell, battery pack, and electric device

Abstract

The battery cell comprises a housing, a jelly roll, and a current collector disk, wherein an accommodating cavity is formed in the housing, a terminal is provided at one end of the housing, and the terminal is insulated from the housing; the jelly roll is mounted in the accommodating cavity, and a first tab and a second tab are provided at the end of the jelly roll corresponding to the terminal; and the current collector disk is sandwiched between the housing and an end of the jelly roll, a clearance through hole is formed in the current collector disk, the first tab passes through the clearance through hole and is conductively connected to the terminal, and the current collector disk is conductively connected to each of the second tab and the housing.

Description

Battery cells, battery packs and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202322946527.0 and application date October 31, 2023, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cell, a battery pack, and an electrical device. Background Art

[0004] In the related art, a cylindrical battery includes an electrode core and a shell. A positive electrode sheet and a negative electrode sheet are provided at the same end of the electrode core. The positive electrode sheet and the negative electrode sheet are symmetrically arranged about the radial direction of the electrode core. A pole is provided on the shell. The positive electrode sheet is electrically connected to the shell through a bus bar, and the negative electrode sheet is electrically connected to the pole sheet through a bus bar and is separated from the positive electrode sheet by an insulating sheet. There are many parts, the installation is difficult, the yield rate is low, and there is room for improvement.

[0005] Application Contents

[0006] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0007] To this end, one object of the present application is to provide a battery cell with a small number of parts, low installation difficulty, and high battery cell yield.

[0008] According to the battery cell of the embodiment of the present application, it includes: a shell, a accommodating cavity is formed in the shell, and a pole is provided at one end of the shell, and the pole is insulated from the shell; a pole core, the pole core is installed in the accommodating cavity, and the pole core is provided with a first pole ear and a second pole ear at the end of the pole column; a current collecting plate, the current collecting plate is clamped between the shell and the end of the pole core, the current collecting plate is formed with an avoidance through-hole, the first pole ear is passed through the avoidance through-hole and is conductively connected to the pole, and the current collecting plate is conductively connected to the second pole ear and the shell respectively.

[0009] According to the battery cell of the embodiment of the present application, the first pole ear is directly conductively connected to the pole, and the second pole ear is conductively connected to the shell through the collecting plate, which is beneficial to reducing the number of parts, reducing the difficulty of installation, improving the yield rate of the battery cell, and improving the practicality of the battery cell.

[0010] According to the battery cells of some embodiments of the present application, the first side wall of the current collecting plate is provided with a connecting protrusion protruding toward the shell, and the connecting protrusion is conductively connected to the shell.

[0011] According to the battery cells of some embodiments of the present application, an escape space is provided between the first side wall of the current collecting plate and the inner wall of the shell, the current collecting plate is provided with a through hole, and the second pole tab extends into the escape space through the through hole and is conductively connected to the first side wall.

[0012] According to the battery cell of some embodiments of the present application, the portion of the second electrode tab that is conductively connected to the first side wall is located on a side of the through hole that is away from the center of the electrode core.

[0013] According to the battery cell of some embodiments of the present application, the protruding height of the connecting protrusion is f, and the thickness of the second electrode tab is h, which satisfies: f≥h+0.5mm.

[0014] According to the battery cells of some embodiments of the present application, the thickness of the connecting protrusion is 2 mm to 3 mm.

[0015] According to the battery cell of some embodiments of the present application, the second pole tab is located on a side of the first pole tab away from the center of the pole core, and the avoidance through hole is formed in the middle of the current collecting plate.

[0016] According to the battery cells of some embodiments of the present application, there are multiple first pole tabs and they are spaced apart along the circumference of the pole core; and / or there are multiple second pole tabs and they are spaced apart along the circumference of the pole core.

[0017] According to the battery cells of some embodiments of the present application, the extending positions of the plurality of first pole tabs are located on a first circle, and the curvature of each first pole tab ranges from 0.35 rad to 0.45 rad; and / or the extending positions of the plurality of second pole tabs are located on a second circle, and the curvature of each second pole tab ranges from 0.35 rad to 0.45 rad.

[0018] According to the battery cell of some embodiments of the present application, the electrode core is formed with a winding center hole, and at least a portion of the winding center hole is covered by at least a portion of at least one first electrode tab.

[0019] According to the battery cells of some embodiments of the present application, each of the first electrode tabs has a covering portion covering the winding center hole, a plurality of the covering portions are overlapped, and the electrode column is conductively connected to the covering portion.

[0020] According to the battery cells of some embodiments of the present application, the pole core is cylindrical, the radius of the pole core is R, the radius of the winding center hole is r, and the extension length of the first pole ear is L1, satisfying: L1=R*a1+a2*r; wherein the value range of a1 is 0.35~0.45, and the value range of a2 is 1.1~1.5.

[0021] According to the battery cells of some embodiments of the present application, each of the second pole tabs is bent in a direction away from the center of the pole core and adheres to a side of the current collecting plate away from the pole core.

[0022] According to the battery cell of some embodiments of the present application, the pole core is cylindrical, the radius of the pole core is R, and the extension length of the second pole tab is L2, which satisfies: L2=a3*R; wherein a3 is 0.2-0.3.

[0023] According to the battery cells of some embodiments of the present application, the radius of the pole core is R, the extending positions of the plurality of first pole tabs are located on a first circle, the extending positions of the plurality of second pole tabs are located on a second circle, the radius of the first circle is r1, and the radius of the second circle is r2, satisfying: r1=R*a4, r2=R*a5; wherein a4 is 0.35~0.45, and a5 is 0.65~0.75.

[0024] This application also proposes a battery pack.

[0025] A battery pack according to an embodiment of the present application includes: a battery cell according to any of the above embodiments and a housing, wherein the battery cell is disposed in the housing.

[0026] The present application further proposes an electrical device.

[0027] According to an embodiment of the present application, the electric device includes: a battery pack according to any of the above embodiments or a battery cell according to any of the above embodiments, and an electric main body, wherein the battery pack or the battery cell is arranged in the electric main body.

[0028] The advantages of the battery pack, the electrical equipment and the battery cell compared to the prior art are the same and will not be described in detail here.

[0029] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG1 is a cross-sectional view of a battery cell according to an embodiment of the present application;

[0031] FIG2 is an exploded view of a battery cell according to an embodiment of the present application;

[0032] FIG3 is a schematic diagram of a pole core according to an embodiment of the present application;

[0033] FIG4 is a schematic diagram of the installation of the pole core and the current collecting plate according to an embodiment of the present application;

[0034] FIG5 is a schematic diagram of an electrical device according to an embodiment of the present application;

[0035] FIG6 is a schematic diagram of an electrical device according to another embodiment of the present application.

[0036] Reference numerals:

[0037] Battery pack 1000, power-consuming entity 2000, power-consuming equipment 3000,

[0038] Battery cell 100, housing 200,

[0039] Shell 1, main body 11, welding groove 111, cover 12, pole 13, accommodating cavity 14,

[0040] Pole core 2, first pole ear 21, second pole ear 22, winding center hole 23,

[0041] The collecting plate 3 , the first side wall 3 a , the avoidance through hole 31 , the connecting protrusion 32 , the through hole 33 , the avoidance space 4 , the insulating spacer 5 , and the insulating sleeve 6 . DETAILED DESCRIPTION

[0042] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0043] Hereinafter, a battery cell 100 according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0044] As shown in Figures 1 to 6, the battery cell 100 according to the embodiment of the present application includes: a shell 1, a pole core 2 and a current collecting plate 3. A accommodating cavity 14 is formed in the shell 1, and a pole post 13 is provided at one end of the shell 1, and the pole post 13 is insulated from the shell 1; the pole core 2 is installed in the accommodating cavity 14, and a first pole ear 21 and a second pole ear 22 are provided at the end of the pole core 2 corresponding to the pole post 13; the current collecting plate 3 is clamped between the shell 1 and the end of the pole core 2, and an avoidance through-hole 31 is formed in the current collecting plate 3. The first pole ear 21 is passed through the avoidance through-hole 31 and is conductively connected to the pole post 13, and the current collecting plate 3 is conductively connected to the second pole ear 22 and the shell 1 respectively.

[0045] This helps reduce the number of parts, lowers the difficulty of installation, improves the yield rate of the battery cell 100 , and reduces processing costs, which helps improve the practicality of the battery cell 100 .

[0046] For example, referring to Figures 1 to 4, the battery cell 100 includes a shell 1, which is cylindrical in shape. The shell 1 includes a main body 11 and a cover portion 12. The main body 11 is cylindrical in shape. The main body 11 is formed with a accommodating cavity 14 with an open end. The cover portion 12 is covered at the open end of the main body 11 and is used to close the accommodating cavity 14. A pole 13 is provided at the other end of the main body 11. The pole 13 penetrates the main body 11 axially. The pole 13 is insulated from the main body 11 by an insulating sleeve 6. One of the pole 13 and the shell 1 leads to a positive electrode and the other leads to a negative electrode.

[0047] The battery cell 100 further includes a pole core 2 and a current collecting plate 3. The pole core 2 is configured to match the accommodating cavity 14 and is intended to be installed within the accommodating cavity 14. A first pole tab 21 and a second pole tab 22 are provided at one end of the pole core 2 corresponding to the pole post 13. The second pole tab 22 is spaced apart. One of the first pole tab 21 and the second pole tab 22 is a positive pole tab and the other is a negative pole tab. The current collecting plate 3 is sandwiched between the housing 1 and the end of the pole core 2. The current collecting plate 3 is provided with an escape hole 31. The escape hole 31 is opposite the pole post 13 and the first pole tab 21, respectively. The first pole tab 21 is inserted into the escape hole 31 and is welded to the pole post 13. For example, the first pole tab 21 and the pole post 13 can be connected by ultrasonic welding to electrically connect the first pole tab 21 and the pole post 13. It is understood that the first pole tab 21 needs to be insulated and inserted into the avoidance through-hole 31 to prevent short circuit between the first pole tab 21 and the current collecting plate 3. For example, the first pole tab 21 does not contact the inner wall of the avoidance through-hole 31, or an insulating member is provided between the first pole tab 21 and the avoidance through-hole 31. The current collecting plate 3 is arranged opposite the second pole tab 22 and is welded to the second pole tab 22. The current collecting plate 3 can be welded to the end face of the housing 1 so that the second pole tab 22 can be conductively connected to the housing 1 through the current collecting plate 3. It should be noted that the housing 1 and the current collecting plate 3 can be welded using a penetration welding method.

[0048] According to the battery cell 100 of the embodiment of the present application, the first pole ear 21 is provided to be directly conductively connected to the pole 13, and the second pole ear 22 is provided to be conductively connected to the shell 1 through the collecting plate 3, which is beneficial to reducing the number of parts, reducing the difficulty of installation, improving the yield rate of the battery cell 100, and improving the practicality of the battery cell 100.

[0049] In some embodiments of the present application, the first side wall 3a of the current collecting disc 3 is provided with a connecting protrusion 32 protruding toward the shell 1, and the connecting protrusion 32 is conductively connected to the shell 1. For example, referring to Figures 1 to 4, the side of the current collecting disc 3 facing the shell 1 can be set as the first side wall 3a, and the first side wall 3a is provided with a connecting protrusion 32. The connecting protrusion 32 is constructed as an annular structure, and the connecting protrusion 32 is arranged around the avoidance through-hole 31 and protrudes toward the shell 1. When the pole core 2 is installed in the accommodating cavity 14, the connecting protrusion 32 can stop on the inner wall of the shell 1 and be welded to the shell 1 to achieve a conductive connection between the current collecting disc 3 and the shell 1. In this way, large-area contact between the current collecting disc 3 and the shell 1 can be avoided, which is conducive to improving the connection stability between the current collecting disc 3 and the shell 1.

[0050] Furthermore, as shown in Figure 2 , the connecting protrusion 32 may be arranged to extend along the edge of the avoidance through hole 31. This helps to simplify the structure of the current collecting plate 3 and reduces the difficulty of processing the current collecting plate 3.

[0051] In the actual arrangement, as shown in Figures 1 and 2, a welding groove 111 can be provided on the side of the shell 1 away from the accommodating cavity 14. The welding groove 111 is constructed in a ring shape and is arranged opposite to the connecting protrusion 32. When the pole core 2 is installed in the accommodating cavity 14, the collecting plate 3 can be penetrated and welded at the welding groove 111 to achieve the connection between the shell 1 and the collecting plate 3.

[0052] In some embodiments of the present application, an escape space 4 is provided between the first side wall 3a of the collecting plate 3 and the inner wall of the shell 1, and the collecting plate 3 is provided with a through hole 33. The second pole ear 22 extends into the escape space 4 through the through hole 33 and is conductively connected to the first side wall 3a.

[0053] For example, as shown in Figures 1 and 2, the first side wall 3a of the current collecting disk 3 is spaced apart from the inner wall of the housing 1 and together define an escape space 4. A through hole 33 is provided on the current collecting disk 3 corresponding to the escape space 4. The through hole 33 is matched with the second pole tab 22, so that the second pole tab 22 can extend from the side of the current collecting disk 3 facing the pole core 2 through the through hole 33 into the escape space 4. The second pole tab 22 is suitable for radially lying on the first side wall 3a of the current collecting disk 3 and being welded to the current collecting disk 3 to achieve an electrically conductive connection between the current collecting disk 3 and the second pole tab 22. Through the above arrangement, the difficulty of welding the current collecting disk 3 and the second pole tab 22 can be reduced, welding quality inspection can be facilitated, and the occurrence of cold welding and leaking welding can be prevented, which is conducive to improving the quality of the battery cell 100.

[0054] In some embodiments of the present application, the portion of the second pole tab 22 electrically connected to the first sidewall 3a is located on the side of the through-hole 33 facing away from the center of the pole core 2. For example, as shown in FIG4 , the second pole tab 22 is spaced apart from the first pole tab 21 on the side facing away from the center of the pole core 2, and a relief hole 31 is provided in the middle of the current collecting plate 3. The first pole tab 21 is insulated and extends through the relief hole 31 and is welded to the pole post 13. The second pole tab 22 can be configured to fall radially outward so that the portion of the second pole tab 22 electrically connected to the first sidewall 3a is located on the side of the through-hole 33 facing away from the center of the pole core 2. This prevents the second pole tab 22 from falling inward and contacting the first pole tab 21, and allows the extended position of the second pole tab 22 (i.e., the position protruding from the surface of the pole core 2) to be closer to the center of the pole core 2, thereby shortening the current path. This improves the practicality of the battery cell 100.

[0055] In some embodiments of the present application, the protruding height of the connecting protrusion 32 is f, and the thickness of the second pole tab 22 is h, satisfying: f ≥ h + 0.5 mm. For example, as shown in FIG1 , the protruding height of the connecting protrusion 32 can be set to f, and the thickness of the second pole tab 22 can be set to h, satisfying: f ≥ h + 0.5 mm, that is, the difference between the protruding height of the connecting protrusion 32 and the thickness of the second pole tab 22 is greater than or equal to 0.5 mm, such as 0.6 mm, 0.8 mm or 1 mm, and this application does not impose any restrictions on this. Through the above arrangement, when the second pole tab 22 falls on the first side wall 3a, the side of the second pole tab 22 facing the shell 1 can maintain a distance from the shell 1 to prevent poor contact between the connecting protrusion 32 and the shell 1, thereby ensuring the connection reliability between the connecting protrusion 32 and the shell 1 and improving the overall quality of the battery cell 100.

[0056] It should be noted that each second tab 22 can be configured as a multi-layer structure, with the number of layers of the second tab 22 being c, the thickness of a single layer being d, and h being equal to d*c. Thus, the thickness of the second tab 22 can be adjusted by adjusting the number of layers of the second tab 22. This facilitates meeting different operating conditions.

[0057] In some embodiments of the present application, as shown in FIG2 , the connecting protrusion 32 can be configured as a circular ring or a rectangular shape, and the thickness of the connecting protrusion 32 can be set to 2 mm to 3 mm, such as 2.1 mm, 2.2 mm, 2.3 mm, etc., where the thickness refers to the wall thickness of the connecting protrusion 32 in the direction from the center to the outside of the current collecting plate 3. Through the above configuration, the connecting protrusion 32 can have sufficient structural strength, which is conducive to improving the reliability of the current collecting plate 3. The connecting protrusion 32 can also have a sufficient contact area with the housing 1, which is conducive to improving the connection stability between the connecting protrusion 32 and the housing 1, thereby improving the reliability of the battery cell 100.

[0058] In some embodiments of the present application, the second pole tab 22 is located on the side of the first pole tab 21 that is away from the center of the pole core 2, and a relief through-hole 31 is formed in the middle of the current collecting plate 3. For example, as shown in FIG4 , the second pole tab 22 is spaced apart from the side of the first pole tab 21 that is away from the center of the pole core 2, and a relief through-hole 31 is provided in the middle of the current collecting plate 3. The first pole tab 21 is insulated and passed through the relief through-hole 31 and is welded to the pole post 13. With the above arrangement, at any installation angle, the current collecting plate 3 or the pole post 13 will not be electrically connected to the first pole tab 21 and the second pole tab 22 at the same time, which can prevent short circuits, help reduce the difficulty of assembling the pole core 2, and improve the yield rate of the battery cell 100.

[0059] In some embodiments of the present application, there are multiple first pole tabs 21 and they are spaced apart along the circumference of the pole core 2; and / or, there are multiple second pole tabs 22 and they are spaced apart along the circumference of the pole core 2. For example, as shown in Figures 1, 3, and 4, there can be multiple first pole tabs 21, and the multiple first pole tabs 21 are spaced apart along the circumference of the pole core 2, and the multiple first pole tabs 21 are used to collectively electrically connect to the pole post 13. At the same time, there can be multiple second pole tabs 22, and the multiple second pole tabs 22 are spaced apart along the circumference of the pole core 2, and the multiple second pole tabs 22 are used to electrically connect to the current collecting plate 3 respectively. Through the above arrangement, the resistance of the battery cell 100 can be reduced, which is conducive to improving the practicality of the battery cell 100.

[0060] In some embodiments of the present application, the extending positions of multiple first pole tabs 21 can be set to be located on the first circle, and the curvature of each first pole tab 21 can range from 0.35rad to 0.45rad; and / or the extending positions of multiple second pole tabs 22 can be set to be located on the second circle, and the curvature of each second pole tab 22 can range from 0.35rad to 0.45rad.

[0061] For example, as shown in Figures 1 to 4, the extension positions of multiple first tabs 21 can be set on the first circle, and the curvature of each first tab 21 can be set to a value range of 0.35 rad to 0.45 rad. For example, the curvature of the first tab 21 can be set to 0.37 rad; or the curvature of the first tab 21 can be set to 0.40 rad; or the curvature of the first tab 21 can be set to 0.43 rad, and this application does not impose any restrictions on this.

[0062] At the same time, the extension positions of the plurality of second pole tabs 22 can be set to be located on the second circle, the second circle being located radially outside the first circle, and the curvature of each second pole tab 22 can be set to a value range of 0.35 rad to 0.45 rad. For example, the curvature of the second pole tab 22 can be set to 0.37 rad; or the curvature of the second pole tab 22 can be set to 0.40 rad; or the curvature of the second pole tab 22 can be set to 0.43 rad, and this application does not impose any restrictions on this.

[0063] Through the above arrangement, the first and second tabs 21 and 22 can have appropriate curvatures to avoid the curvature being too small and difficult to weld, and to avoid the curvature being too large and causing the first and second tabs 21 and 22 to tear during the installation process, thereby improving the design rationality of the battery cell 100.

[0064] Furthermore, as shown in FIG3 , the number of first pole tabs 21 and second pole tabs 22 can be the same, the plurality of first pole tabs 21 and the plurality of second pole tabs 22 are radially aligned one by one, and the curvature of the first pole tab 21 is the same as the curvature of the second pole tab 22. In a specific processing process, the pole tabs can be processed on the same side of the positive and negative pole sheets by laser die-cutting, and then the positive and negative pole sheets and the separator are wound together to form the pole core 2. At this time, the pole tabs are wound into a cylindrical shape, and the pole tabs can be cut by laser die-cutting to respectively process the first pole tab 21 and the second pole tab 22.

[0065] Through the above arrangement, the difficulty of processing the first electrode tab 21 and the second electrode tab 22 can be reduced, thereby improving the reliability of the battery cell 100 .

[0066] In some embodiments of the present application, the pole core 2 is formed with a winding center hole 23, and at least a portion of the winding center hole 23 is covered by at least a portion of at least one first pole lug 21. For example, as shown in Figures 1 to 4, the pole core 2 is wound, and a winding center hole 23 is formed in the middle of the pole core 2. The pole post 13 is arranged opposite the winding center hole 23. The multiple first pole lugs 21 are all located radially outward of the winding center hole 23. The multiple first pole lugs 21 are tilted inward to extend toward the winding center hole 23, so that at least a portion of the winding center hole 23 is covered by at least a portion of the at least one first pole lug 21. The portion of the first pole lug 21 covering the winding center hole 23 is opposite the pole post 13 and is welded to the pole post 13 to achieve a conductive connection between the first pole lug 21 and the pole post 13.

[0067] Through the above-mentioned arrangement, the first pole ear 21 can be positioned to ensure that the first pole ear 21 can contact the pole post 13 after the pole core 2 is loaded into the accommodating cavity 14, thereby improving the connection reliability between the pole post 13 and the first pole ear 21. In addition, during the welding process, the welding head needle can pass through the winding center hole 23 from the other end of the pole core 2 to weld the contact position, which has low welding difficulty and is conducive to improving the design rationality of the battery cell 100.

[0068] In some embodiments of the present application, each first electrode tab 21 has a covering portion covering the winding center hole 23 , and a plurality of covering portions are overlapped and conductively connected to the electrode 13 .

[0069] For example, as shown in FIG4 , a plurality of first pole tabs 21 can be arranged to be tilted inward and extend to the winding center hole 23 , so that each first pole tab 21 has a covering portion covering the winding center hole 23 , and the covering portions of the plurality of first pole tabs 21 are arranged to overlap along the axial direction of the pole core 2 . When the pole core 2 is installed in the accommodating cavity 14 , the plurality of covering portions can be in contact with the pole post 13 and welded together. Specifically, the plurality of covering portions can be welded together, and the covering portion close to the pole post 13 can be welded together with the pole post 13 ; alternatively, the plurality of covering portions can all be welded together with the pole post 13 , and this application does not impose any restrictions on this. In this way, it can be ensured that the plurality of first pole tabs 21 can all be conductively connected to the pole post 13 , which is beneficial to improving the reliability of the battery cell 100 .

[0070] In some embodiments of the present application, the pole core 2 is cylindrical, the radius of the pole core 2 is R, the radius of the winding center hole 23 is r, and the extension length of the first pole ear 21 is L1, satisfying: L1 = R*a1+a2*r; wherein, the value range of a1 is 0.35~0.45, and the value range of a2 is 1.1~1.5.

[0071] For example, referring to Figures 1 and 2, the pole core 2 is cylindrical in shape. The radius of the pole core 2 can be set to R, which can generally be 15 mm to 40 mm. The radius of the winding center hole 23 can be set to r, and the extension position of multiple first pole tabs 21 can be set as a first circle, with the radius r1 of the first circle being 0.35R to 0.45R. At the same time, the extension length of the first pole tab 21 can be set to L1, satisfying: L1 = R*a1+a2*r; wherein the value range of a1 is 0.35 to 0.45, and the value range of a2 is 1.1 to 1.5. It should be noted here that the radius of the first circle and the second circle refers to the radius from the center of the circle where the extension position is located to the inner side of the corresponding pole tab, wherein the inner side is the side surface of the pole tab facing the center of the pole core 2.

[0072] Specifically, when the radius r1 of the first circle is 0.4R, a1 can be taken as 0.4, and a2 can be taken as 1.3, so that the extension length L1 of the first pole tab 21 is 0.4 times the radius R of the pole core 2 plus 1.3 times the radius r of the winding center hole 23; or, a1 can be taken as 0.4, and a2 can be taken as 1.4, so that the extension length L1 of the first pole tab 21 is 0.4 times the radius R of the pole core 2 plus 1.4 times the radius r of the winding center hole 23. This application does not impose any restrictions on this.

[0073] When the radius r1 of the first circle is 0.42R, a1 can be taken as 0.42, and a2 can be taken as 1.3, so that the extension length L1 of the first pole ear 21 is 0.42 times the radius R of the pole core 2 plus 1.3 times the radius r of the winding center hole 23; or, a1 can be taken as 0.42, and a2 can be taken as 1.4, so that the extension length L1 of the first pole ear 21 is 0.42 times the radius R of the pole core 2 plus 1.4 times the radius r of the winding center hole 23. This application does not impose any restrictions on this.

[0074] Through the above-mentioned arrangement, it can be ensured that at least a portion of the first pole tab 21 covers the winding center hole 23, so that the first pole tab 21 can be stably connected to the pole post 13, and the first pole tab 21 can be prevented from being too long, saving materials, and helping to reduce interference between multiple first pole tabs 21, thereby improving the reliability of the battery cell 100.

[0075] In some embodiments of the present application, as shown in FIG4 , each second electrode tab 22 can be bent in a direction away from the center of the electrode core 2 and attached to a side of the current collecting plate 3 away from the electrode core 2. This arrangement prevents the second electrode tab 22 from being electrically connected to the first electrode tab 21 and shortens the distance between the second electrode tab 22 and the middle portion of the electrode core 2, thereby shortening the current path and improving the conductivity of the battery cell 100.

[0076] In some embodiments of the present application, the pole core 2 is cylindrical, the radius of the pole core 2 is R, and the extension length of the second pole tab 22 is L2, which satisfies: L2=a3*R; wherein a3 is 0.2-0.3.

[0077] For example, referring to Figures 1 to 4, the pole core 2 is cylindrical, the radius of the pole core 2 is set to R, the radius of the second circle is 0.65R to 0.75R, and the extension length of the second pole tab 22 is L2, satisfying: L2 = a3 * R; wherein a3 is 0.2 to 0.3. For example, when the radius r2 of the second circle is 0.6R, a1 can be set to 0.29R so that the extension length L2 of the second pole tab 22 is 0.21 times the radius R of the pole core 2; or, when the radius r2 of the second circle is 0.74, a1 can be set to 0.21 so that the extension length L2 of the second pole tab 22 is 0.21 times the radius R of the pole core 2. This application is not limited to this.

[0078] Through the above arrangement, the second pole tab 22 can have a sufficient contact surface with the collecting plate 3, which is conducive to reducing resistance, and can prevent the second pole tab 22 from extending to the radial outside of the pole core 2 after being fallen over, thereby preventing the second pole tab 22 from interfering with the installation process, thereby improving the reliability of the battery cell 100.

[0079] In some embodiments of the present application, the radius of the pole core 2 is R, the extended positions of the multiple first pole tabs 21 are located on the first circle, the extended positions of the multiple second pole tabs 22 are located on the second circle, the radius of the first circle is r1, and the radius of the second circle is r2, satisfying: r1=R*a4, r2=R*a5; wherein a4 is 0.35~0.45, and a5 is 0.65~0.75.

[0080] For example, as shown in Figures 1 and 4 , the radius of the pole core 2 can be set to R, the extension positions of the plurality of first pole tabs 21 are located on a first circle, and the extension positions of the plurality of second pole tabs 22 are located on a second circle. The first circle and the second circle extend along the circumference of the pole core 2, and the second circle is located radially outward of the first circle. The radius of the first circle can be set to r1, and the radius of the second circle can be set to r2, satisfying: r1 = R * a4, r2 = R * a5; where a4 is 0.35-0.45, and a5 is 0.65-0.75. For example, a4 can be set to 0.4 to set the radius r1 of the first circle to 0.4R, and a5 can be set to 0.7 to set the radius of the second circle to 0.7R, so that the spacing between the first pole tab 21 and the second pole tab 22 is set to 0.3R.

[0081] Through the above arrangement, a sufficient gap can be provided between the first electrode tab 21 and the second electrode tab 22 to avoid a short circuit caused by a conductive connection between the first electrode tab 21 and the second electrode tab 22 , thereby improving the reliability of the battery cell 100 .

[0082] Furthermore, as shown in Figures 1 and 2, the battery cell 100 further includes an insulating spacer 5, which is sandwiched between the end of the pole core 2 and the housing 1. The insulating spacer 5 is used to separate the first pole tab 21 and the second pole tab 22 to prevent the first pole tab 21 and the second pole tab 22 from forming a conductive connection. This can improve the reliability of the battery cell 100.

[0083] Specifically, the manufacturing steps of the battery cell 100 are as follows:

[0084] In the first step, the positive and negative electrodes of the battery cell 100 are laser die-cut to form tabs on the same side of the positive and negative electrodes. The size of the tabs is calculated based on the first tab 21, the second tab 22, the diaphragm, and the desired effect after actual winding.

[0085] In the second step, the positive and negative electrode sheets are wound together with the separator to form a core 2. The positive and negative electrode sheets are separated by the separator. The tabs of the positive and negative electrode sheets are located at the same end of the core 2, and the tabs are wound into a multi-layer cylindrical shape. It should be noted that the separator is arranged to protrude from both ends of the core 2 to completely separate the positive and negative electrode sheets.

[0086] In the third step, the tab portion is processed using a metal tool or laser die-cutting to form a plurality of first tabs 21 and a plurality of second tabs 22 at the same end of the pole core 2. The plurality of first tabs 21 are evenly distributed in a circular pattern, and the second tabs 22 are located on the side of the first tab 21 away from the center of the pole core 2, and the plurality of second tabs 22 are evenly distributed in a circular pattern. It should be noted that both the first tab 21 and the second tab 22 have a multi-layer structure distributed along the radial direction.

[0087] In the fourth step, ultrasonic pre-welding is performed on the first and second pole tabs 21, 22, respectively, so that the first and second pole tabs 21, 22 are formed into a single piece. Multiple first pole tabs 21 are radially tilted toward the winding center hole 23 and stacked in sequence. The second pole tab 22 is inserted into the through hole 33 and extends to the side of the current collecting plate 3 facing away from the pole core 2. The second pole tab 22 can be tilted radially outward onto the first sidewall 3a of the current collecting plate 3. A low-intensity laser is then used to weld the second pole tab 22 to the current collecting plate 3. Next, an insulating spacer 5 can be placed on the end face of the pole core 2. The pole core 2 is then placed into the accommodating cavity 14, so that the first pole tab 21 abuts against the pole post 13. A welding needle is then inserted from the other end of the pole core 26 through the winding center hole 23. The welding needle is used to perform ultrasonic torque welding on the contact point between the first pole tab 21 and the pole post 13 to weld the first pole tab 21 and the pole post 13 together.

[0088] In the fifth step, the cover 12 and the main body 11 are assembled. After assembly, laser sealing welding is performed along the circumference of the cover 12 at the connection point between the cover and the main body 11. Through-welding is then performed between the housing 1 and the current collecting plate 3 through the welding grooves 111. This completes the processing of the battery cell 100.

[0089] This application also proposes a battery pack 1000 .

[0090] As shown in Figure 6, the battery pack 1000 according to an embodiment of the present application includes: a battery cell 100 according to any of the above embodiments and a shell 200, the battery cell 100 is arranged in the shell 200, and the shell 200 is used to protect the battery cell 100, so as to prevent the battery cell 100 from being directly impacted when the battery pack 1000 collides.

[0091] According to the battery pack 1000 of the embodiment of the present application, the first pole ear 21 is provided to be directly conductively connected to the pole 13, and the second pole ear 22 is provided to be conductively connected to the shell 1 through the collecting plate 3, which is beneficial to reducing the number of parts, reducing the difficulty of installation, and improving the yield rate of the battery cell 100, which is beneficial to improving the practicality of the battery cell 100 and ensuring the reliability of the battery pack 1000.

[0092] This application also proposes an electrical device 3000.

[0093] As shown in Figures 5 and 6, an electric device 3000 according to an embodiment of the present application includes: a battery pack 1000 according to any of the above embodiments or a battery cell 100 according to any of the above embodiments, and an electric device 2000, wherein the battery pack 1000 or the battery cell 100 is disposed within the electric device 2000. For example, the electric device 2000 may be a new energy vehicle, a hybrid vehicle, an aircraft, an energy storage cabinet, or the like.

[0094] According to the electrical equipment 3000 of the embodiment of the present application, the first pole ear 21 is provided to be directly conductively connected to the pole 13, and the second pole ear 22 is provided to be conductively connected to the shell 1 through the collecting plate 3, which is beneficial to reducing the number of parts, reducing the difficulty of installation, and improving the yield rate of the battery cell 100. It is beneficial to improve the practicality of the battery cell 100, ensure the reliability of the battery pack 1000, and improve the overall performance of the electrical equipment 3000.

[0095] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0096] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means more than two, unless otherwise specifically defined.

[0097] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0098] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0099] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0100] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery cell (100), wherein: include: A shell (1), wherein a receiving cavity (14) is formed in the shell (1), and a pole (13) is provided at one end of the shell (1), and the pole (13) is insulated from the shell (1); A pole core (2), the pole core (2) being installed in the accommodating cavity (14), and the end of the pole core (2) corresponding to the pole column (13) being provided with a first pole lug (21) and a second pole lug (22); A current collecting plate (3), the current collecting plate (3) being sandwiched between the shell (1) and the end of the pole core (2), the current collecting plate (3) being formed with an avoidance through hole (31), the first pole lug (21) being passed through the avoidance through hole (31) and being conductively connected to the pole (13), and the current collecting plate (3) being conductively connected to the second pole lug (22) and the shell (1), respectively.

2. The battery cell (100) according to claim 1, wherein: The first side wall (3a) of the current collecting plate (3) is provided with a connecting protrusion (32) protruding toward the shell (1), and the connecting protrusion (32) is electrically connected to the shell (1).

3. The battery cell (100) according to claim 2, wherein: An escape space (4) is provided between the first side wall (3a) of the current collecting disk (3) and the inner wall of the shell (1); the current collecting disk (3) is provided with a through hole (33); the second pole lug (22) extends into the escape space (4) through the through hole (33) and is conductively connected to the first side wall (3a).

4. The battery cell (100) according to claim 3, wherein: The portion of the second pole tab (22) that is electrically connected to the first side wall (3a) is located on a side of the through hole (33) that is away from the center of the pole core (2).

5. The battery cell (100) according to claim 3 or 4, wherein: The protruding height of the connecting protrusion (32) is f, and the thickness of the second pole tab (22) is h, satisfying: f≥h+0.5mm.

6. The battery cell (100) according to any one of claims 3 to 5, wherein: The thickness of the connecting protrusion (32) is 2 mm to 3 mm.

7. The battery cell (100) according to any one of claims 1 to 6, wherein: The second pole lug (22) is located on a side of the first pole lug (21) away from the center of the pole core (2), and the avoidance through hole (31) is formed in the middle of the current collecting plate (3).

8. The battery cell (100) according to any one of claims 1 to 7, wherein: The first pole lugs (21) are multiple and are arranged at intervals along the circumference of the pole core (2); and / or the second pole lugs (22) are multiple and are arranged at intervals along the circumference of the pole core (2).

9. The battery cell (100) according to claim 8, wherein: The extension positions of the plurality of first pole lugs (21) are located on a first circle, and the curvature of each first pole lug (21) is in the range of 0.35 rad to 0.45 rad; and / or The extension positions of the plurality of second pole tabs (22) are located on a second circle, and the curvature of each second pole tab (22) is in the range of 0.35 rad to 0.45 rad.

10. The battery cell (100) according to claim 8 or 9, wherein: The pole core (2) is formed with a winding center hole (23), and at least a portion of the winding center hole (23) is covered with at least a portion of at least one of the first pole tabs (21).

11. The battery cell (100) according to claim 10, wherein: Each of the first pole lugs (21) has a covering portion covering the winding center hole (23), and a plurality of the covering portions are overlapped and electrically connected to the pole (13).

12. The battery cell (100) according to claim 11, wherein: The pole core (2) is cylindrical, the radius of the pole core (2) is R, the radius of the winding center hole (23) is r, and the extension length of the first pole ear (21) is L1, satisfying: L1=R*a1+a2*r; wherein the value range of a1 is 0.35-0.45, and the value range of a2 is 1.1-1.

5.

13. The battery cell (100) according to any one of claims 8 to 12, wherein: Each of the second pole lugs (22) is bent in a direction away from the center of the pole core (2) and is attached to a side of the current collecting plate (3) away from the pole core (2).

14. The battery cell (100) according to claim 13, wherein: The pole core (2) is cylindrical, the radius of the pole core (2) is R, and the extension length of the second pole lug (22) is L2, which satisfies: L2=a3*R; wherein a3 is 0.2-0.

3.

15. The battery cell (100) according to any one of claims 8 to 14, wherein: The radius of the pole core (2) is R, the extension positions of the plurality of first pole tabs (21) are located on a first circle, the extension positions of the plurality of second pole tabs (22) are located on a second circle, the radius of the first circle is r1, the radius of the second circle is r2, and the following conditions are satisfied: r1 = R*a4, r2 = R*a5; wherein a4 is 0.35 to 0.45, and a5 is 0.65 to 0.

75.

16. A battery pack (1000), wherein: include: According to the battery cell (100) and the housing (200) according to any one of claims 1 to 15, the battery cell (100) is arranged in the housing (200).

17. An electrical device (3000), wherein: include: According to the battery pack (1000) according to claim 16 or the battery cell (100) according to any one of claims 1 to 15, and an electricity-consuming entity (2000), the battery pack (1000) or the battery cell (100) is arranged in the electricity-consuming entity (2000).

Images