Single battery and battery pack

Abstract

The embodiment of the utility model discloses a single battery and a battery pack. The single battery comprises a shell and a battery pack, the end cover is arranged at one end, in the axial direction, of the shell; the electrode assembly is arranged in the shell and comprises an electrode main body, a first tab and a second tab, the first tab and the second tab are both arranged at the end, close to the end cover, of the electrode main body in the axial direction, the polarity of the first tab is opposite to that of the second tab, and the first tab and the second tab are arranged at an interval; the current collecting component is arranged in the shell; the current collecting component comprises a first current collecting part and a second current collecting part; the first current collecting part is electrically connected with the first tab; the second current collecting part is electrically connected with the second tab and the end cover; and the insulating part is connected between the first current collecting part and the second current collecting part so as to insulate the first current collecting part from the second current collecting part. According to the battery cell, the current collecting components are designed in an integrated manner, so that the assembly efficiency of the battery cell is effectively improved, and the production efficiency of the battery cell is further improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a single cell and a battery pack. Background Art

[0002] With the rapid development of mobile phones, laptops, electric vehicles, power tools, etc., batteries with high capacity, high cycle life and high safety performance have been widely used and developed. At the same time, there is an urgent need for batteries with higher capacity, better durability, and better safety. However, the output of batteries is closely related to the production efficiency of batteries. Therefore, how to improve the production efficiency of batteries has become an urgent problem to be solved. Utility Model Content

[0003] The embodiments of the present application provide a single cell battery and a battery pack to improve the production efficiency of the single cell battery.

[0004] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0005] In one aspect, a single cell is provided, having an axial direction, and comprising:

[0006] case;

[0007] An end cover, disposed at one end of the housing in the axial direction;

[0008] an electrode assembly disposed in the housing, and comprising an electrode body, a first pole lug and a second pole lug, wherein the first pole lug and the second pole lug are both disposed at an end of the electrode body close to the end cover in the axial direction, the polarity of the first pole lug is opposite to the polarity of the second pole lug, and the first pole lug and the second pole lug are disposed at intervals; and

[0009] A current collecting component is arranged in the housing;

[0010] The current collecting component includes: a first current collecting portion electrically connected to the first electrode tab;

[0011] a second current collecting portion electrically connected to the second electrode tab and the end cover; and

[0012] An insulating portion is connected between the first current collecting portion and the second current collecting portion to insulate the first current collecting portion from the second current collecting portion.

[0013] In addition to or instead of one or more features disclosed above, the first pole lug and the second pole lug each include a plurality of pole lugs, the plurality of second pole lugs are stacked in a ring shape and the second current collecting portion is in a ring shape, the second pole lug surrounds the outer circumference of the first pole lug, the second current collecting portion surrounds the outer circumference of the first current collecting portion, and at least a portion of the insulating portion is disposed between the first pole lug and the second pole lug.

[0014] In addition to or as an alternative to one or more of the features disclosed above, the insulating portion includes: a first connecting portion, a second connecting portion, and an isolation protrusion;

[0015] The first connecting portion is fixedly connected to the first current collecting portion, the second connecting portion is fixedly connected to the second current collecting portion, the isolation protrusion is connected between the first connecting portion and the second connecting portion to connect the two as a whole, the isolation protrusion protrudes along the axial direction toward one side of the electrode assembly, and at least part of the isolation protrusion is arranged between the first pole ear and the second pole ear.

[0016] In addition to or as an alternative to one or more of the features disclosed above, a first positioning groove is provided on the first current collecting portion, and a first positioning portion is provided on the first connecting portion;

[0017] The first positioning portion is embedded in the first positioning groove to fixedly connect the first current collecting portion and the first connecting portion.

[0018] In addition to or as an alternative to one or more of the features disclosed above, the single battery further has a circumference around the axial direction;

[0019] A plurality of the first positioning grooves and the first positioning portions are provided, wherein the plurality of the first positioning grooves are arranged along the circumferential direction on the outer side of the first collecting portion, and the plurality of the first positioning portions are arranged along the circumferential direction on the inner side of the first connecting portion, and each of the first positioning portions is respectively embedded in a corresponding first positioning groove.

[0020] In addition to or as an alternative to one or more of the features disclosed above, a second positioning groove is provided on the second current collecting portion, and a second positioning portion is provided on the second connecting portion;

[0021] The second positioning portion is embedded in the second positioning groove to fixedly connect the second current collecting portion and the second connecting portion.

[0022] In addition to or as an alternative to one or more of the features disclosed above, the single battery further has a circumference around the axial direction;

[0023] A plurality of the second positioning grooves and the second positioning portions are provided, wherein the plurality of the second positioning grooves are arranged along the circumferential direction on the inner side of the second current collecting portion, and the plurality of the second positioning portions are arranged along the circumferential direction on the outer side of the second connecting portion;

[0024] Each of the second positioning portions is respectively embedded in a corresponding one of the second positioning grooves.

[0025] In addition to or as an alternative to one or more of the features disclosed above, the second current collecting portion is further provided with a plurality of positioning holes, each of the positioning holes being located in a corresponding one of the second positioning grooves;

[0026] Each of the second positioning portions is protrudingly provided with a third positioning portion, and each of the third positioning portions is embedded in a corresponding one of the positioning holes.

[0027] In addition to or as an alternative to one or more of the features disclosed above, the end cover is provided with a through hole;

[0028] The single cell further includes: a pole, the pole is passed through the through hole and connected to the end cover, the pole and the end cover are insulated, and the pole is electrically connected to the first current collecting part;

[0029] Among them, the pole is provided with a limiting groove at one end close to the electrode assembly in the axial direction, and the first current collecting part includes a limiting protrusion, and the limiting protrusion is embedded in the limiting groove.

[0030] In addition to one or more features disclosed above, or as an alternative, the first current collecting portion further includes a pole lug connecting portion connected to the limiting protrusion, the pole lug connecting portion is arranged around the limiting protrusion, the limiting protrusion protrudes toward the surface of the end cover on the surface of the pole lug connecting portion, the pole lug connecting portion is used to be welded to the first pole lug, and the vertical distance from the surface of the pole lug connecting portion close to the end cover to the end cover is less than the vertical distance from the surface of the second current collecting portion close to the end cover to the end cover;

[0031] The axial dimension of the first pole tab is H1 mm, and the axial dimension of the second pole tab is H2 mm, satisfying: H1<H2.

[0032] On the other hand, a battery pack is further disclosed, which, in addition to or instead of one or more of the features disclosed above, comprises a case; and a single cell as described in any one of the above items, wherein the single cell is disposed in the case.

[0033] One of the above technical solutions has the following advantages or beneficial effects: the present application connects the first current collecting part, the second current collecting part and the insulating part into an integral structure, that is, the current collecting component is integratedly designed, which effectively improves the assembly efficiency of the single cell, thereby improving the production efficiency of the single cell; at the same time, the first current collecting part and the second current collecting part are separated by an insulating part to reduce the risk of short circuit between the first current collecting part and the second current collecting part, thereby improving the safety performance of the single cell; at the same time, the present application arranges the first pole ear and the second pole ear on the same side, and the first pole ear is electrically connected to the pole through the first current collecting part, and the second pole ear is electrically connected to the end cover through the current collecting part, so that the single cell forms a current path of pole column-first current collecting part-first pole ear-electrode body-second pole ear-second current collecting part-end cover, thereby making the current path of the single cell not conductive to the shell when the single cell is working normally, thereby making the resistance value of the structural parts of the single cell when the single cell is working not include the shell, effectively reducing the internal resistance of the single cell and improving the performance of the single cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0035] Figure 1 is a three-dimensional structural view of a single cell provided according to an embodiment of the present application;

[0036] Figure 2 is an exploded structural view of a single cell provided according to an embodiment of the present application;

[0037] Figure 3 is a partial cross-sectional view of a single cell provided according to an embodiment of the present application;

[0038] Figure 4 is a three-dimensional structural view of a current collecting component provided according to an embodiment of the present application;

[0039] Figure 5 is a cross-sectional view of a current collecting component provided according to an embodiment of the present application;

[0040] Figure 6 is a three-dimensional structural view of a first current collecting portion provided according to an embodiment of the present application;

[0041] Figure 7 is a three-dimensional structural view of an insulating portion provided according to an embodiment of the present application;

[0042] Figure 8 is a three-dimensional structural view of a second current collecting portion provided according to an embodiment of the present application;

[0043] Fig. 9 is a partial cross-sectional view of a current collecting component provided according to another embodiment of the present application;

[0044] Fig.10 This is a three-dimensional structural view of a second current collecting portion provided according to another embodiment of the present application.

[0045] Description of reference numerals:

[0046] 100. Single cell;

[0047] 110. Shell;

[0048] 120, electrode assembly; 121, first pole ear; 122, second pole ear; 123, electrode body;

[0049] 130, current collecting member; 131, first current collecting part; 1311, first positioning groove; 1312, limiting convex part; 1313, pole ear connecting part; 132, second current collecting part; 1321, second positioning groove; 1322, positioning hole; 133, insulating part; 1331, first connecting part; 1332, second connecting part; 1333, isolating convex part; 1334, first positioning part; 1335, second positioning part; 1336, third positioning part;

[0050] 140, end cover; 141, through hole;

[0051] 150, pole; 151, column portion; 1511, limiting groove; 152, first electrical connection portion; 153, second electrical connection portion;

[0052] 160. Insulating gasket;

[0053] 170. Seals;

[0054] 180. Riveted parts. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0056] 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" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which 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 cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0057] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0059] At present, the positive and negative ears in the existing batteries are generally arranged on opposite sides, the positive ear is electrically connected to the pole, and the negative ear is electrically connected to the bottom wall or cover of the shell, resulting in too many overall assembly processes for the battery and low battery production efficiency. At the same time, since the busbar electrically connected to the positive and negative electrodes outside the battery is arranged on one side of the positive pole, the circuit in the battery will flow through the entire shell, so that the resistance value of the battery's structural parts includes the entire battery shell, resulting in a large internal resistance of the structural parts, which reduces the performance of the battery.

[0060] In order to solve the above technical problems, in the embodiments of the present application, please refer to Figures 1 to 10 The present application provides a single cell 100 , wherein the single cell 100 has an axial direction Z and a circumferential direction R around the axial direction Z.

[0061] The single cell 100 may be a secondary battery, which refers to a single cell that can be used continuously by activating active materials by charging after the single cell is discharged. Exemplarily, the single cell 100 may be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery or a nickel cadmium battery, but is not limited thereto.

[0062] The single cell 100 may be a cylindrical single cell, a prismatic single cell, a soft-pack single cell, or a single cell of other shapes.

[0063] Specifically, the single battery 100 includes: a housing 110 , an electrode assembly 120 , a current collecting member 130 , an end cover 140 and a pole 150 .

[0064] The end cover 140 is arranged at one end of the shell 110 in the axial direction Z; the electrode assembly 120 is arranged in the shell 110, and the electrode assembly 120 includes an electrode body 123, a first pole ear 121 and a second pole ear 122, the first pole ear 121 and the second pole ear 122 are both arranged at the end of the electrode body 123 in the axial direction Z close to the end cover 140, the polarity of the first pole ear 121 is opposite to the polarity of the second pole ear 122, and the first pole ear 121 and the second pole ear 122 are arranged at intervals; the current collecting component 130 is arranged in the shell 110; the pole 150 is arranged on the end cover 140.

[0065] The housing 110 may be made of a strong material such as metal, but is not limited thereto. For example, the housing 110 may be made of an aluminum profile, but is not limited thereto.

[0066] The end cap 140 can be integrally formed with the housing 110, that is, the end cap 140 and the housing 110 are an integrated structure; the end cap 140 can also be fixedly connected to the housing 110, for example, the end cap 140 is fixedly connected to one end of the housing 110 in the second direction Z by welding or other processes. This is not specifically limited in this application and can be specifically set according to actual circumstances. For example, in this application, the end cap 140 and the housing 110 are separately set, and the end cap 140 and the housing 110 are fixed by welding.

[0067] Among them, the first pole ear 121 can be a positive pole ear or a negative pole ear, which is not specifically limited in this application and can be selected according to actual circumstances. The pole 150 can be a positive pole column or a negative pole column, which is not specifically limited in this application and can be selected according to actual circumstances. Exemplarily, in this application, the first pole ear 121 is a positive pole ear and the pole 150 is a positive pole column.

[0068] The pole 150 may be made of conductive metal or other materials, but is not limited thereto. For example, the pole 150 may be made of metal copper or aluminum, but is not limited thereto.

[0069] Among them, the above-mentioned single cell 100 also includes an electrolyte and other functional components. The electrolyte can be a conventional electrolyte or a special electrolyte with additives added. The electrolyte is used to soak the electrode assembly 120. Among them, the electrode assembly 120 is a component in the single cell 100 where an electrochemical reaction occurs, and the electrode assembly can be one or more. The electrode assembly 120 is mainly formed by winding a positive electrode sheet, a diaphragm and a negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active substances constitute the electrode body 123, and the parts of the positive electrode sheet and the negative electrode sheet without active substances constitute the pole ears. During the charge and discharge process of the single cell 100, the positive electrode active substance and the negative electrode active substance react with the electrolyte, and the pole ears are directly electrically connected to the poles to form a current loop, so that the single cell 100 can be used normally.

[0070] For details, please refer to Figures 2 to 3 The current collecting component 130 includes a first current collecting portion 131 , a second current collecting portion 132 and an insulating portion 133 .

[0071] The first current collecting part 131 is electrically connected to the first pole lug 121 and the pole 150 ; the second current collecting part 132 is electrically connected to the second pole lug 122 and the end cover 140 ; ​​the insulating part 133 is connected between the first current collecting part 131 and the second current collecting part 132 to insulate the first current collecting part 131 from the second current collecting part 132 .

[0072] There are various connection structures between the first current collecting part 131 and the first pole lug 121 and the pole 150, such as welding, abutment or clamping, etc. Similarly, there are various connection structures between the second current collecting part 132 and the second pole lug 122, and between the second current collecting part 132 and the end cover 140, such as welding, abutment or clamping, etc.

[0073] The first collecting section 131 and the second collecting section 132 may be made of various materials. For example, the first collecting section 131 and the second collecting section 132 may be made of copper, iron, aluminum, steel or aluminum alloy, but are not limited thereto.

[0074] The material of the insulating portion 133 may be rubber, silicone, or plastic, but is not limited thereto.

[0075] The current collecting component 130 in the single battery 100 of the present application can be prepared by any known method. For example, the first current collecting part 131 and the second current collecting part 132 are respectively die-casted by a die-casting mold, and the first current collecting part 131 and the second current collecting part 132 are placed in an injection mold, and the insulating part 133 is injection-molded by the injection mold, that is, the first current collecting part 131, the second current collecting part 132 and the insulating part 133 are simultaneously connected into an integral structure while the insulating part 133 is molded by the injection mold, so as to form the current collecting component 130 in the present application. It can be understood that the present application connects the first current collecting part 131, the second current collecting part 132 and the insulating part 133 into an integral structure, that is, the current collecting member 130 is designed in an integrated manner, which effectively improves the assembly efficiency of the single battery 100, thereby improving the production efficiency of the single battery 100; at the same time, the first current collecting part 131 and the second current collecting part 132 are separated by the insulating part 133 to reduce the risk of short circuit between the first current collecting part 131 and the second current collecting part 132, thereby improving the safety performance of the single battery 100; at the same time, the present application arranges the first pole ear 121 and the second pole ear 122 on the same side, and the first The pole ear 121 is electrically connected to the pole 150 through the first current collecting part 131, and the second pole ear 122 is electrically connected to the end cover 140 through the current collecting part 132, so that the single cell 100 forms a current path of the pole 150-first current collecting part 131-first pole ear 121-electrode body 123-second pole ear 122-second current collecting part 132-end cover 140, so that the current path of the single cell 100 when working normally is not conducted to the shell 110, so that the resistance value of the structural parts of the single cell 100 when working does not include the shell, which effectively reduces the internal resistance of the single cell 100 and improves the performance of the single cell 100.

[0076] In one embodiment, please refer to Figures 2 to 3 The first pole lug 121 and the second pole lug 122 each include a plurality of pole lugs, and the plurality of second pole lugs 122 are stacked in a ring shape. Specifically, the plurality of second pole lugs 122 are stacked in a ring shape along the circumferential direction R and the second current collecting portion 132 is in a ring shape. The second pole lug 122 surrounds the outer periphery of the first pole lug 121, and the second current collecting portion 132 surrounds the outer periphery of the first current collecting portion 131.

[0077] At least part of the insulating portion 133 is disposed between the first electrode tab 121 and the second electrode tab 122 to insulate and isolate the first electrode tab 121 and the second electrode tab 122 to prevent the first electrode tab 121 from contacting the second electrode tab 122 and causing a short circuit in the single battery 100 , thereby improving the safety performance of the single battery 100 .

[0078] In one embodiment, please refer to Figures 2 to 3 A through hole 141 is opened on the end cover 140 , and the pole 150 is passed through the through hole 141 and connected to the end cover 140 .

[0079] Specifically, a limiting groove 1511 is provided at one end of the pole 150 close to the electrode assembly 120 in the axial direction Z, and the first current collecting part 131 includes a limiting protrusion 1312, which protrudes from the side of the first current collecting part 131 close to the pole 150, and the limiting protrusion 1312 is embedded in the limiting groove 1511, so that the electrical connection between the first current collecting part 131 and the pole 150 is realized by utilizing the cooperation between the limiting protrusion 1312 and the limiting groove 1511, and at the same time, the first current collecting part 131 is limited by utilizing the cooperation between the limiting protrusion 1312 and the limiting groove 1511, so as to ensure that the single cell 100 is tightly assembled as a whole, and eliminate the risk of displacement of components in the single cell 100 and causing failure.

[0080] In one embodiment, please refer to Figure 3 The first current collecting portion 131 also includes a pole lug connecting portion 1313 connected to the limiting protrusion 1312, the pole lug connecting portion 1313 is arranged around the limiting protrusion 1312, the limiting protrusion 1312 protrudes toward the surface of the end cover 140 on the surface of the pole lug connecting portion 1313, the pole lug connecting portion 1313 is used for welding with the first pole lug 121, and the vertical distance from the surface of the pole lug connecting portion 1313 close to the end cover 140 to the end cover 140 is smaller than the vertical distance from the surface of the second current collecting portion 132 close to the end cover 140 to the end cover 140, that is, the first current collecting portion 131 is arranged away from the end cover 140 relative to the second current collecting portion 132 in the axial direction Z.

[0081] The dimension of the first pole tab 121 in the axial direction Z is H1 mm, and the dimension of the second pole tab 122 in the axial direction Z is H2 mm, satisfying: H1<H2. That is, the dimension H1 mm of the first pole tab 121 in the axial direction Z is smaller than the dimension H2 mm of the second pole tab 122 in the axial direction Z.

[0082] The size H1 mm of the first pole tab 121 in the axial direction Z and the size H2 mm of the second pole tab 122 in the axial direction Z can be obtained by disassembling the actual single battery 100, measuring the size of the first pole tab 121 in the axial direction Z and the size of the second pole tab 122 in the axial direction Z multiple times using a measuring tool, and calculating the average value. The measuring tool can be any one of a ruler, a vernier caliper, or other dimension measuring instruments, but is not limited thereto.

[0083] The present application prevents the first current collecting part 131 and the second current collecting part 132 from being in contact with the end cover 140 at the same time after the single cell 100 is assembled, thereby ensuring the normal use of the single cell 100 and facilitating the overall assembly of the single cell 100.

[0084] In one embodiment, please refer to Figure 4 , Figure 5 , Figure 7 The insulating portion 133 includes: a first connecting portion 1331 , a second connecting portion 1332 and an isolation protrusion 1333 .

[0085] The first connection portion 1331 is fixedly connected to the first current collecting portion 131 to achieve a fixed connection between the insulating portion 133 and the first current collecting portion 131, the second connection portion 1332 is fixedly connected to the second current collecting portion 132 to achieve a fixed connection between the insulating portion 133 and the second current collecting portion 132, the isolation protrusion 1333 is connected between the first connection portion 1331 and the second connection portion 1332 to connect the two as a whole, the isolation protrusion 1333 protrudes along the axial direction Z toward one side of the electrode assembly 120, and at least part of the isolation protrusion 1333 is arranged between the first pole ear 121 and the second pole ear 122 to insulate and isolate the first pole ear 121 and the second pole ear 122, prevent the first pole ear 121 from contacting the second pole ear 122 and causing a short circuit in the single battery 100, and improve the safety performance of the single battery 100.

[0086] The first connection part 1331, the second connection part 1332 and the isolation convex part 1333 can be separately provided, and the first connection part 1331 and the isolation convex part 1333, the second connection part 1332 and the isolation convex part 1333 are fixedly connected. For example, the first connection part 1331 and the isolation convex part 1333, the second connection part 1332 and the isolation convex part 1333 are fixedly connected by adhesive bonding. The first connection part 1331, the second connection part 1332 and the isolation convex part 1333 can also be integrally formed, for example, the first connection part 1331, the second connection part 1332 and the isolation convex part 1333 can be integrally formed by injection molding.

[0087] The second connection portion 1332 and the isolation protrusion 1333 are integrally injection-molded to obtain an integrally formed insulating portion 133 .

[0088] In one embodiment, please refer to Figures 4 to 8The first current collecting part 131 is provided with a first positioning groove 1311 , and the first connecting part 1331 is provided with a first positioning part 1334 ; the first positioning part 1334 is embedded in the first positioning groove 1311 to fix the first current collecting part 131 and the first connecting part 1331 together.

[0089] The shapes of the first positioning portion 1334 and the first positioning groove 1311 are adapted to each other. Specifically, the shapes of the first positioning portion 1334 and the first positioning groove 1311 can be circular, polygonal or other shapes, but are not limited thereto.

[0090] In the present application, the first positioning portion 1334 and the first positioning groove 1311 cooperate to achieve a fixed connection between the first current collecting portion 131 and the insulating portion 133, so as to ensure a tight connection between the first current collecting portion 131 and the insulating portion 133, prevent the first current collecting portion 131 and the insulating portion 133 from loosening and causing a short circuit between the first current collecting portion 131 and other components, and ensure the normal use of the single battery 100.

[0091] Further, in one embodiment, please refer again to Figures 4 to 8 There are multiple first positioning grooves 1311 and multiple first positioning portions 1334. Multiple first positioning grooves 1311 are arranged along the circumferential direction R on the outer side of the first collecting portion 131, and multiple first positioning portions 1334 are arranged along the circumferential direction R on the inner side of the first connecting portion 1331, and each first positioning portion 1334 is respectively embedded in a corresponding first positioning groove 1311.

[0092] Among them, multiple first positioning grooves 1311 and multiple first positioning portions 1334 can be regularly arranged along the circumferential direction R, that is, the distance between two adjacent first positioning grooves 1311 is equal, and the distance between two adjacent first positioning portions 1334 is equal; multiple first positioning grooves 1311 and multiple first positioning portions 1334 can also be irregularly arranged along the circumferential direction R, that is, the distance between two adjacent first positioning grooves 1311 is not equal, and the distance between two adjacent first positioning portions 1334 is not equal. No specific limitation is made in the present application and it can be set according to the actual situation.

[0093] The present application sets a plurality of first positioning grooves 1311 and a plurality of first positioning portions 1334 to utilize the cooperation between the plurality of first positioning grooves 1311 and the plurality of first positioning portions 1334 to enhance the fixing strength between the first current collecting portion 131 and the insulating portion 133, further ensure the tight connection between the first current collecting portion 131 and the insulating portion 133, prevent the first current collecting portion 131 and the insulating portion 133 from loosening and causing a short circuit between the first current collecting portion 131 and other components, and ensure the normal use of the single cell 100.

[0094] It should be understood that the connection structure between the first current collecting part 131 and the insulating part 133 in the present application is not limited to being achieved through the cooperation of the first positioning part 1334 and the first positioning groove 1311. Other connection structures, for example: the first current collecting part 131 and the insulating part 133 are fixed by adhesive, the first current collecting part 131 and the insulating part 133 are fixed by riveting, etc., can also achieve a fixed connection between the first current collecting part 131 and the insulating part 133, and should also be regarded as embodiments of the present application.

[0095] In one embodiment, please refer to Figures 4 to 8 A second positioning groove 1321 is formed on the second current collecting portion 132 , and a second positioning portion 1335 is provided on the second connecting portion 1332 ; the second positioning portion 1335 is embedded in the second positioning groove 1321 to fix the second current collecting portion 132 and the second connecting portion 1332 together.

[0096] The second positioning portion 1335 and the second positioning groove 1321 have matching shapes. Specifically, the second positioning portion 1335 and the second positioning groove 1321 may be circular, polygonal or other shapes, but are not limited thereto.

[0097] In the present application, the second positioning portion 1335 and the second positioning groove 1321 cooperate to achieve a fixed connection between the second current collecting portion 132 and the insulating portion 133, so as to ensure a tight connection between the second current collecting portion 132 and the insulating portion 133, prevent the second current collecting portion 132 and the insulating portion 133 from loosening and causing a short circuit between the second current collecting portion 132 and other components, and ensure the normal use of the single battery 100.

[0098] Further, in one embodiment, please refer again to Figures 4 to 8 There are multiple second positioning grooves 1321 and multiple second positioning portions 1335. Multiple second positioning grooves 1321 are arranged along the circumferential direction R on the inner side of the second collecting portion 132, and multiple second positioning portions 1335 are arranged along the circumferential direction R on the outer side of the second connecting portion 1332. Each second positioning portion 1335 is respectively embedded in a corresponding second positioning groove 1321.

[0099] Among them, multiple second positioning grooves 1321 and multiple second positioning portions 1335 can be regularly arranged along the circumferential direction R, that is, the distance between two adjacent second positioning grooves 1321 is equal, and the distance between two adjacent second positioning portions 1335 is equal; multiple second positioning grooves 1321 and multiple second positioning portions 1335 can also be irregularly arranged along the circumferential direction R, that is, the distance between two adjacent second positioning grooves 1321 is not equal, and the distance between two adjacent second positioning portions 1335 is not equal. No specific limitation is made in the present application and it can be specifically set according to the actual situation.

[0100] The present application sets a plurality of second positioning grooves 1321 and a plurality of second positioning portions 1335 to utilize the cooperation between the plurality of second positioning grooves 1321 and the plurality of second positioning portions 1335 to enhance the fixing strength between the second current collecting portion 132 and the insulating portion 133, further ensure the tight connection between the second current collecting portion 132 and the insulating portion 133, prevent the second current collecting portion 132 and the insulating portion 133 from loosening and causing a short circuit between the second current collecting portion 132 and other components, and ensure the normal use of the single battery 100.

[0101] In one embodiment, please refer to Figures 9 and 10 The second current collecting part 132 is also provided with a plurality of positioning holes 1322, and each positioning hole 1322 is respectively located in a corresponding second positioning groove 1321; each second positioning part 1335 is protrudingly provided with a third positioning part 1336, and each third positioning part 1336 is embedded in a corresponding positioning hole 1322, so as to utilize the cooperation between the third positioning part 1336 and the positioning hole 1322 to further enhance the fixing strength between the second current collecting part 132 and the insulating part 133, and further ensure the tight connection between the second current collecting part 132 and the insulating part 133.

[0102] The shapes of the third positioning portion 1336 and the positioning hole 1322 are matched. Specifically, the shapes of the third positioning portion 1336 and the positioning hole 1322 can be circular, polygonal or other shapes, but are not limited thereto.

[0103] It should be understood that the connection structure between the second current collecting part 132 and the insulating part 133 in the present application is not limited to being achieved through the cooperation of the first positioning part 1334 and the first positioning groove 1311, and the cooperation of the third positioning part 1336 and the positioning hole 1322. Other connection structures, for example: the second current collecting part 132 and the insulating part 133 are fixed by adhesive; the second current collecting part 132 and the insulating part 133 are fixed by riveting, etc., can also achieve a fixed connection between the second current collecting part 132 and the insulating part 133, and should also be regarded as embodiments of the present application.

[0104] In one embodiment, please refer to Figure 3 The pole 150 includes: a column portion 151, a first electrical connection portion 152 and a second electrical connection portion 153. The column portion 151 extends along the axial direction Z. The first electrical connection portion 152 and the second electrical connection portion 153 are respectively arranged on both sides of the column portion 151 in the axial direction Z. The column portion 151 is arranged in the through hole 141 and is connected to the end cover 140. The limiting groove 1511 is opened at one end of the column portion 151 close to the electrode assembly 120 in the axial direction Z; the first electrical connection portion 152 is arranged in the shell 110, and the first electrical connection portion 152 is electrically connected to the first current collecting portion 131. The second electrical connection portion 153 is located on the outside of the end cover 140, and the second electrical connection portion 153 is used for conductive connection with an external circuit.

[0105] The column 151, the first electrical connection part 152 and the second electrical connection part 153 can be integrally formed, and the first electrical connection part 152 and the second electrical connection part 153 can also be separately provided with the column 151, and are respectively fixedly connected to the column 151 by welding process. This application does not make specific restrictions, and can be specifically provided according to actual circumstances.

[0106] In one embodiment, please refer to Figures 2 to 3 The above-mentioned single battery 100 further includes: an insulating gasket 160 , a sealing member 170 and a rivet 180 .

[0107] The sealing member 170 is sleeved on the outer periphery of the column portion 151 to seal the connection between the pole 150 and the shell 110, thereby ensuring the overall sealing effect of the single cell 100. The rivet 180 is sleeved on the outer periphery of the second electrical connection portion 153, and the rivet 180 is arranged on the outer side of the shell 110. The rivet 180 and the second electrical connection portion 153 are riveted together to position and fix the pole 150, thereby making the single cell 100 tightly assembled as a whole, eliminating the risk of displacement of components in the single cell 100 and causing failure, and the rivet 180 is arranged on the outer side of the shell 110 to avoid the rivet 180 occupying the internal space of the shell 110, thereby increasing the space occupancy rate of the electrode assembly 120 in the shell 110, and thereby increasing the energy density of the single cell 100.

[0108] Furthermore, the insulating gasket 160 is disposed in the housing 110 and between the end cover 140 and the first current collecting part 131 to isolate the end cover 140 from the first current collecting part 131 to prevent the contact between the two from causing a short circuit in the single battery 100.

[0109] The sealing member 170 may be made of insulating material. For example, the sealing member 170 may be a rubber sealing ring, etc., but is not limited thereto.

[0110] The rivet 180 is made of insulating material. For example, the rivet 180 is made of plastic, but not limited thereto.

[0111] In one embodiment, the number of rivets 180 may be increased in the present application to enhance the riveting fixing effect of the pole 150, further allowing the single cell 100 to be tightly assembled as a whole, thereby eliminating the risk of failure caused by displacement of components in the single cell 100.

[0112] The pole 150 and the end cover 140 are insulated by the rivet 180 , the seal 170 , and the insulating gasket 160 .

[0113] On the other hand, in an embodiment of the present application, the present application further provides a battery pack, comprising: a box body; and a single cell 100 as described in any of the above embodiments, wherein the single cell 100 is disposed in the box body.

[0114] The battery pack may be a three-layer battery pack of single cell-battery module-battery pack, or a module-free battery pack of two layers of single cell-battery pack.

[0115] On the other hand, in an embodiment of the present application, the present application further provides an electric device, including: a battery pack as described above, the battery pack serving as a power supply for the electric device. The electric device may be, but is not limited to, a mobile device (e.g., a mobile phone, a laptop computer, etc.), an electric vehicle (e.g., a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.), an electric train, a ship, a satellite, an energy storage system, etc.

[0116] The introduction provided in the above steps is only used to help understand the method, structure and core idea of ​​the present application. For ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A single battery having an axial direction, characterized in that: include: case; An end cover, disposed at one end of the housing in the axial direction; an electrode assembly, disposed in the housing, and comprising an electrode body, a first pole lug and a second pole lug, wherein the first pole lug and the second pole lug are both disposed at an end of the electrode body close to the end cover in the axial direction, the polarity of the first pole lug is opposite to the polarity of the second pole lug, and the first pole lug and the second pole lug are disposed at intervals; as well as A current collecting component is arranged in the housing; The current collecting component comprises: A first current collecting portion, electrically connected to the first electrode tab; a second current collecting portion electrically connected to the second electrode tab and the end cover; and An insulating portion is connected between the first current collecting portion and the second current collecting portion to insulate the first current collecting portion from the second current collecting portion.

2. The single cell according to claim 1, characterized in that: The first pole lug and the second pole lug each include a plurality of pole lugs, the plurality of second pole lugs are stacked in a ring shape and the second current collecting portion is in a ring shape, the second pole lug surrounds the outer circumference of the first pole lug, the second current collecting portion surrounds the outer circumference of the first current collecting portion, and at least a portion of the insulating portion is disposed between the first pole lug and the second pole lug.

3. The single cell according to claim 2, characterized in that: The insulating portion includes: a first connecting portion, a second connecting portion and an isolation convex portion; The first connecting portion is fixedly connected to the first current collecting portion, the second connecting portion is fixedly connected to the second current collecting portion, the isolation protrusion is connected between the first connecting portion and the second connecting portion to connect the two as a whole, the isolation protrusion protrudes along the axial direction toward one side of the electrode assembly, and at least part of the isolation protrusion is arranged between the first pole ear and the second pole ear.

4. The single cell according to claim 3, characterized in that: A first positioning groove is provided on the first current collecting portion, and a first positioning portion is provided on the first connecting portion; The first positioning portion is embedded in the first positioning groove to fixedly connect the first current collecting portion and the first connecting portion.

5. The single cell according to claim 4, characterized in that: The single cell also has a circumference around the axial direction; A plurality of the first positioning grooves and the first positioning portions are provided, wherein the plurality of the first positioning grooves are arranged along the circumferential direction on the outer side of the first collecting portion, and the plurality of the first positioning portions are arranged along the circumferential direction on the inner side of the first connecting portion, and each of the first positioning portions is respectively embedded in a corresponding first positioning groove.

6. The single cell according to claim 3, characterized in that: A second positioning groove is provided on the second current collecting portion, and a second positioning portion is provided on the second connecting portion; The second positioning portion is embedded in the second positioning groove to fixedly connect the second current collecting portion and the second connecting portion.

7. The single cell according to claim 6, characterized in that: The single cell also has a circumference around the axial direction; A plurality of the second positioning grooves and the second positioning portions are provided, wherein the plurality of the second positioning grooves are arranged along the circumferential direction on the inner side of the second current collecting portion, and the plurality of the second positioning portions are arranged along the circumferential direction on the outer side of the second connecting portion; Each of the second positioning portions is respectively embedded in a corresponding one of the second positioning grooves.

8. The single cell according to claim 7, characterized in that: The second current collecting portion is also provided with a plurality of positioning holes, each of which is located in a corresponding second positioning groove; Each of the second positioning portions is protrudingly provided with a third positioning portion, and each of the third positioning portions is embedded in a corresponding one of the positioning holes.

9. The single cell according to claim 1, characterized in that: The end cover is provided with a through hole; The single cell further includes: a pole, the pole is passed through the through hole and connected to the end cover, the pole and the end cover are insulated, and the pole is electrically connected to the first current collecting part; Among them, the pole is provided with a limiting groove at one end close to the electrode assembly in the axial direction, and the first current collecting part includes a limiting protrusion, and the limiting protrusion is embedded in the limiting groove.

10. The single cell according to claim 9, characterized in that: The first current collecting part further includes a pole lug connecting part connected to the limiting protrusion, the pole lug connecting part is arranged around the limiting protrusion, the limiting protrusion protrudes toward the surface of the end cover on the surface of the pole lug connecting part, the pole lug connecting part is used for welding with the first pole lug, and the vertical distance from the surface of the pole lug connecting part close to the end cover to the end cover is smaller than the vertical distance from the surface of the second current collecting part close to the end cover to the end cover; The axial dimension of the first pole tab is H1 mm, and the axial dimension of the second pole tab is H2 mm, satisfying: H1<H2.

11. A battery pack, characterized in that: include: Box; as well as The single cell according to any one of claims 1 to 10, wherein the single cell is disposed in the box.

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