Composite collector plate, cylindrical battery and battery pack

Abstract

The utility model provides a composite collector plate, a cylindrical battery and a battery pack, and belongs to the technical field of secondary batteries. The utility model provides a composite current collector plate which is used for a cylindrical battery, the composite current collector plate comprises a positive current collector piece, a negative current collector piece and an insulating piece, the insulating piece comprises an insulating part and an insulating bulge arranged on the insulating part, and the insulating bulge is used for being arranged towards a naked battery cell. The part, located on one side of the insulating protrusion, of the insulating part is connected with the positive current collector, and the part, located on the other side of the insulating protrusion, of the insulating part is connected with the negative current collector. The positive current collector and the negative current collector are respectively connected to the two sides of the insulating bulge, so that the naked battery cell can adopt a structural design scheme that the positive lug and the negative lug are led out from the same side, and the positive lug and the negative lug are fixed on the same composite current collector plate; therefore, the composite collector plate only needs to occupy the design space of one collector plate and one tab in the height direction of the cylindrical battery, so that the design space occupied in the height direction of the cylindrical battery is reduced.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of secondary batteries, and specifically to a composite current collecting plate, a cylindrical battery, and a battery pack. Background Art

[0002] Cylindrical batteries are a type of battery with high capacity and long cycle life, and are widely used in solar lamps, lawn lamps, backup energy, power tools, toy models and other fields.

[0003] Existing cylindrical batteries generally have the problems of large volume, low energy density and low space utilization. Therefore, how to further reduce the volume of cylindrical batteries and improve their energy density and space utilization has become an urgent problem to be solved. Utility Model Content

[0004] The present application provides a composite current collecting plate and a cylindrical battery, which can improve the overall space utilization and energy density of the cylindrical battery.

[0005] In a first aspect, the present application provides a composite current collector tray for use with cylindrical batteries. The composite current collector tray includes a positive electrode current collector, a negative electrode current collector, and an insulating member. The insulating member includes an insulating portion and an insulating protrusion provided on the insulating portion, the insulating protrusion being positioned toward the bare battery cell. The portion of the insulating portion located on one side of the insulating protrusion is connected to the positive electrode current collector, and the portion of the insulating portion located on the other side of the insulating protrusion is connected to the negative electrode current collector.

[0006] Through the above scheme, by connecting the positive current collector and the negative current collector to the two sides of the insulating protrusion respectively, the bare battery cell can adopt a structural design scheme in which the positive electrode ear and the negative electrode ear are led out from the same side, and the positive electrode ear and the negative electrode ear are fixed on the same composite current collecting plate, so that the composite current collecting plate only needs to occupy the design space of one current collecting plate and the ear in the height direction of the cylindrical battery, thereby reducing the design space occupied in the height direction of the cylindrical battery, thereby improving the overall space utilization and energy density of the cylindrical battery.

[0007] In one possible design, the positive electrode current collector includes a first base portion, a first support portion, and a first connection portion. The first base portion and the first connection portion are connected to the same side of the first support portion, with a gap provided between the first base portion and the first connection portion. The insulating portion is inserted into the gap between the first base portion and the first connection portion.

[0008] Through this solution, the first base portion and the first connecting portion are separately connected to the first supporting portion, forming the positive current collector into a single integral structure. This provides strong structural strength to the components of the positive current collector, thereby enabling the composite current collector to function properly. The insulating portion, inserted into the gap between the first base portion and the first connecting portion, facilitates the installation and positioning of the insulating portion and the positive current collector, improving both the precision of the connection between the insulating portion and the positive current collector and facilitating assembly of the composite current collector, thereby increasing installation efficiency.

[0009] In one possible design, the first base portion is located on the side of the insulating protrusion and is used to connect to the positive terminal of the bare battery cell. The first connecting portion is located on the side away from the insulating protrusion, and the first connecting portion is at least partially located directly opposite the center of the insulating portion, and is used to connect to the terminal of the cylindrical battery.

[0010] Through the above solution, since the pole of a cylindrical battery is usually arranged at the center of the cylindrical battery, the arrangement of the first connecting portion at least partially located directly opposite the center of the insulating portion can form a larger contact area between the first connecting portion and the pole, so that a good connection relationship is formed between the first connecting portion and the pole. The positive electrode current collector realizes an electrical connection between the positive electrode current collector and the outside of the bare battery cell through the connection between the first base portion and the positive electrode ear, so that the positive electrode current collector can serve as a current transmission medium to conduct the current generated by the bare battery cell to the external circuit. The positive electrode current collector realizes an electrical connection between the positive electrode current collector and the inside of the bare battery cell through the connection between the first connecting portion and the pole.

[0011] In one possible design, the negative electrode current collector includes a second base portion, a second support portion, and a second connection portion. The second base portion and the second connection portion are connected to the same side of the second support portion, with a gap provided between the second base portion and the second connection portion. The insulating portion is inserted into the gap between the second base portion and the second connection portion.

[0012] Through this solution, the second base portion and the second connecting portion are respectively connected to the second supporting portion, forming the negative electrode current collector into a single integrated structure. This provides strong structural strength to the various components of the negative electrode current collector, thereby enabling the composite current collector to function properly. The insulating portion, inserted into the gap between the second base portion and the second connecting portion, facilitates the installation and positioning of the insulating portion and the negative electrode current collector, improving the precision of the connection between the insulating portion and the negative electrode current collector and facilitating assembly of the composite current collector, thereby increasing installation efficiency.

[0013] In one possible design, the second base portion is located on the side of the insulating protrusion and is used to connect to the negative terminal of the bare battery cell. The second connecting portion is located on the side away from the insulating protrusion and connects to the barrel of the cylindrical battery. The second connecting portion avoids the center of the insulating portion to avoid the cylindrical battery's terminal.

[0014] Through the above solution, the arrangement of the second connecting portion avoiding the central portion directly opposite the insulating portion can prevent the second connecting portion from directly contacting the first connecting portion, thereby preventing a short circuit between the positive and negative current collectors. In addition, since the pole of a cylindrical battery is generally located at the center of the cylindrical battery, the arrangement of the second connecting portion avoiding the central portion directly opposite the insulating portion can prevent the first and second connecting portions from contacting the pole simultaneously, thereby preventing a short circuit between the positive and negative poles of the cylindrical battery and enabling the cylindrical battery to function normally.

[0015] In a possible design, the positive electrode current collector and the negative electrode current collector are respectively connected to the insulating member by injection molding, clamping, or heat melting.

[0016] Through the above solution, the positive electrode current collector and the negative electrode current collector can form a stable connection relationship with the insulating member respectively, so that the various components in the composite current collecting plate are connected as a whole, so that the composite current collecting plate has good stability and structural strength.

[0017] In a second aspect, the present application provides a cylindrical battery comprising a bare cell, a cylindrical body, and the composite current collector plate of the first aspect. The bare cell is mounted within the cylindrical body, and the composite current collector plate is disposed at one end of the cylindrical body. A positive tab and a negative tab are disposed on the side of the bare cell proximate the composite current collector plate. The positive tab is connected to a positive current collector, and the negative tab is connected to a negative current collector.

[0018] Through the above solution, the cylindrical battery body is usually cylindrical and is generally made of aluminum or steel, with good conductivity and ductility. The body not only provides a space for the bare battery cells to be installed, but also provides protection for the bare cells, protecting them from the external environment and ensuring the normal operation of the cylindrical battery.

[0019] In one possible design, the positive current collector is welded to the positive tab, and the negative current collector is welded to the negative tab. A first connection hole is provided on the insulating portion corresponding to the positive current collector to facilitate welding the positive current collector and the positive tab from the side of the insulating portion facing away from the bare cell. A second connection hole is provided on the insulating portion corresponding to the negative current collector to facilitate welding the negative current collector and the negative tab from the side of the insulating portion facing away from the bare cell.

[0020] Through the above scheme, the first connection hole and the second connection hole can avoid the influence of the insulating part on the welding, so that a better welding effect can be obtained between the positive electrode collector and the positive electrode ear, and between the negative electrode collector and the negative electrode ear, to form a good connection strength, and then the composite current collecting plate and the bare battery cell form an effective electrical connection, so that the cylindrical battery can work normally.

[0021] In one possible design, the positive electrode tab is bonded to the positive electrode current collector, and the negative electrode tab is bonded to the negative electrode current collector.

[0022] Through the above scheme, not only can good connection strength be formed between the positive electrode ear and the positive electrode collector, and between the negative electrode ear and the negative electrode collector, but also an electrical connection relationship can be formed, so that a good electrical connection relationship is formed between the negative electrode collector plate and the positive and negative electrode ears of the bare battery cell, thereby enabling the cylindrical battery to be used normally.

[0023] The beneficial effects of the cylindrical battery provided in the second aspect and each possible design of the second aspect can be referred to the beneficial effects brought about by the first aspect and each possible implementation method of the first aspect, and will not be repeated here.

[0024] In a third aspect, the present application provides a battery pack including cylindrical batteries.

[0025] The beneficial effects of the battery pack provided in the third aspect and each possible design of the third aspect can be referred to the beneficial effects brought about by the first aspect and each possible implementation method of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the overall structure of a cylindrical battery provided in an embodiment of the present application.

[0027] Figure 2 A schematic cross-sectional view of a cylindrical battery provided in an embodiment of the present application.

[0028] Figure 3 A schematic structural diagram of a composite current collecting plate provided in an embodiment of the present application.

[0029] Figure 4 A schematic structural diagram of an insulating component provided in an embodiment of the present application.

[0030] Figure 5 This is a schematic structural diagram of a positive electrode current collector provided in an embodiment of the present application at a first viewing angle.

[0031] Figure 6 This is a schematic structural diagram of a positive electrode current collector provided in an embodiment of the present application at a second viewing angle.

[0032] Figure 7 This is a schematic structural diagram of a negative electrode current collector provided in an embodiment of the present application at a first viewing angle.

[0033] Figure 8 This is a schematic structural diagram of a negative electrode current collector provided in an embodiment of the present application at a second viewing angle.

[0034] Figure identification: 1. Composite current collecting plate; 11. Positive current collector; 111. First base portion; 112. First support portion; 113. First connecting portion; 12. Negative current collector; 121. Second base portion; 122. Second support portion; 123. Second connecting portion; 13. Insulating member; 131. Insulating portion; 1311. First connecting hole; 1312. Second connecting hole; 132. Insulating protrusion; 2. Cylindrical battery; 21. Bare cell; 22. Cylinder. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0037] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists, A and B exist, and B exists. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0039] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the current limiting module of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application.

[0040] In addition, the terms "first", "second", etc. in the description and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more such features.

[0041] In the description of this application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two (including two).

[0042] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, "connected" or "connected" in a mechanical structure can refer to a physical connection. For example, a physical connection can be a fixed connection, such as a fixed connection via a barrier, such as a screw, bolt, or other barrier. A physical connection can also be a removable connection, such as a snap-fit connection. A physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. "Connected" or "connected" in a circuit structure can refer not only to a physical connection, but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate component, as long as circuit connectivity is achieved. It can also refer to internal communication between two components. A signal connection can refer not only to signal connection through an electrical circuit, but also to signal connection through a media medium, such as radio waves. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0043] The present application discloses a composite current collecting plate, a cylindrical battery and a battery pack. The cylindrical battery includes the composite current collecting plate, and the battery includes the cylindrical battery.

[0044] The battery pack may specifically include a battery management system (BMS) and a plurality of the cylindrical batteries. The plurality of cylindrical batteries may be electrically connected in series, in parallel, or in a combination of series and parallel, and may be communicatively connected to the battery management system to form a battery pack. The battery management system may control and monitor the working status of each cylindrical battery. In addition, the plurality of cylindrical batteries may be first connected in series and / or in parallel, and may be combined with the module management system to form a battery module. The plurality of battery modules may then be electrically connected in series, in parallel, or in a combination of series and parallel, and may be combined with the battery management system to form a battery pack.

[0045] The multiple cylindrical batteries in the battery pack or battery module can be mounted on a supporting structure such as a box, frame, or bracket. Electrical connections can be made between the cylindrical batteries and between the cylindrical batteries and the battery management system via a busbar, such as a tab. The cylindrical batteries can be lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, which are not limited in this embodiment of the present application.

[0046] Typically, a cylindrical battery consists of a battery casing and a bare cell, which is housed within the casing. The bare cell is the smallest unit in the battery that undergoes electrochemical reactions, enabling the charge and discharge of the battery cell. It typically includes a positive electrode, a negative electrode, and a separator separating the two. The battery casing is filled with an electrolyte that penetrates the bare cell, providing a pathway for ion migration and conducting electricity.

[0047] Figure 1 A schematic diagram of the overall structure of a cylindrical battery provided in an embodiment of the present application.

[0048] Figure 2 A schematic cross-sectional view of a cylindrical battery provided in an embodiment of the present application.

[0049] like Figure 1 and Figure 2 As shown, the present application provides a cylindrical battery 2, comprising a bare cell 21, a barrel 22, and a composite current collecting tray 1. The bare cell 21 is mounted within the barrel 22, and the composite current collecting tray 1 is disposed at one end of the barrel 22. The composite current collecting tray 1 includes a positive current collector and a negative current collector. A positive tab and a negative tab are provided on the side of the bare cell 21 near the composite current collecting tray 1. The positive tab is connected to the positive current collector, and the negative tab is connected to the negative current collector.

[0050] The bare cell 21 is mainly formed by winding a positive electrode sheet, a separator and a negative electrode sheet stacked in sequence. In order to facilitate the connection of the bare cell 21, a positive electrode tab is extended from the positive electrode sheet, and a negative electrode tab is extended from the negative electrode tab.

[0051] The cylindrical body 22 of the cylindrical battery 2 is typically cylindrical and made of aluminum or steel, exhibiting excellent conductivity and ductility. The body 22 not only provides space for the bare cells 21 but also protects them from the external environment, ensuring proper operation of the cylindrical battery 2.

[0052] The specific structure of the composite collecting plate 1 will be described in detail below and will not be expanded here.

[0053] Figure 3 This is a structural diagram of a composite current collecting plate provided in an embodiment of the present application. Figure 4 A schematic structural diagram of an insulating component provided in an embodiment of the present application.

[0054] See Figures 2 to 4 The present application provides a composite current collecting tray 1 for use with a cylindrical battery 2. The composite current collecting tray 1 includes a positive electrode current collector 11, a negative electrode current collector 12, and an insulating member 13. The insulating member 13 includes an insulating portion 131 and an insulating protrusion 132 provided on the insulating portion 131. The insulating protrusion 132 is configured to be disposed toward the bare battery cell 21. The portion of the insulating portion 131 located on one side of the positive electrode insulating protrusion 132 is connected to the positive electrode current collector 11, and the portion of the insulating portion 131 located on the other side of the insulating protrusion 132 is connected to the negative electrode current collector 12.

[0055] The positive current collector 11 and the negative current collector 12 are important components for collecting and conducting current. The positive current collector 11 needs to be electrically connected to the positive tab of the bare cell 21 to ensure that the positive tab of the bare cell 21 can effectively conduct current to the external circuit. The negative current collector 12 needs to be electrically connected to the negative tab of the bare cell 21 to ensure that the negative tab of the bare cell 21 can effectively conduct current to the external circuit.

[0056] The positive electrode current collector 11 and the negative electrode current collector 12 may be made of a material with good electrical conductivity, such as copper, silver, aluminum, stainless steel, etc.

[0057] The insulating member 13 is primarily used to isolate the positive current collector 11 from the negative current collector 12, preventing direct contact between the positive current collector 11 and the negative current collector 12, thereby preventing a short circuit between the positive current collector 11 and the negative current collector 12, thereby ensuring the normal operation of the cylindrical battery 2. In addition, the insulating member 13 is also used to isolate the bare battery cell 21 from the pole of the cylindrical battery 1 to prevent electrical connection between the pole piece with a different polarity from the pole and the pole, which could cause a short circuit in the cylindrical battery 1.

[0058] The insulating member 13 needs to have good electrical insulation performance, high temperature resistance and chemical stability, so the material of the insulating member 13 can be high-performance polymer insulating materials such as plastic, rubber, Teflon, etc.

[0059] The insulating part 13 consists of an insulating portion 131 and an insulating protrusion 132. The insulating portion 131 and the insulating protrusion 132 can be connected by gluing, snapping, or other connection methods to form a good connection strength between the insulating portion 131 and the insulating protrusion 132. The insulating portion 131 and the insulating protrusion 132 can also be combined into one by injection molding, so that the insulating part 13 can be used directly without additional assembly, thereby simplifying the assembly steps of the insulating part 13 and improving the installation efficiency of the insulating part 13.

[0060] like Figure 4 As shown, in an optional embodiment, the insulating protrusion 132 is a long strip-shaped protrusion, the insulating protrusion 132 is located at the center line of the insulating portion 131 , and the insulating protrusion 132 is disposed through the insulating portion 131 .

[0061] The positive electrode current collector 11 and the negative electrode current collector 12 are respectively connected to the insulating portion 131 , and the connection positions are respectively located on both sides of the insulating protrusion 132 . The specific connection method can be gluing, clamping, riveting, welding, hot melt connection, injection molding connection, etc.

[0062] Among them, when the positive current collector 11 and the negative current collector 12 are respectively clamped or hot-melt connected with the insulating part 13, connecting protrusions can be provided on both sides of the insulating protrusion 132 of the insulating part 131, and the positive current collector 11 and the negative current collector 12 are both provided with connecting holes corresponding to the connecting protrusions. The connecting protrusions are inserted into the connecting holes for cooperation, so as to realize the clamping or hot-melt connection between the positive current collector 11 and the negative current collector 12 and the insulating part 13 respectively.

[0063] The insulating portion 131 can form a stable connection between the positive current collector 11 and the negative current collector 12 and the insulating member 13 respectively, so that all components in the composite current collecting plate 1 are connected as a whole, so that the composite current collecting plate 1 has good stability and structural strength.

[0064] The insulating protrusion 132 can not only separate and insulate the positive current collector 11 and the negative current collector 12 located on both sides of the insulating protrusion 132 to avoid short circuit between the positive current collector 11 and the negative current collector 12, thereby improving the safety performance of the cylindrical battery 2 and ensuring the normal operation of the cylindrical battery 2, but the setting of the insulating protrusion 132 can also play an installation and positioning role in the assembly of the composite current collecting plate 1 and even the cylindrical battery 2, so as to facilitate the installation of the composite current collecting plate 1 and improve the installation efficiency of the composite current collecting plate 1.

[0065] See Figure 3In an optional embodiment, the shape of the composite current collecting plate 1 assembled by the positive current collecting member 11, the negative current collecting member 12 and the insulating member 13 is approximately cylindrical, so that the shapes of the composite current collecting plate 1 and the cylindrical battery 2 are more closely matched, thereby enabling the composite current collecting plate 1 to improve space utilization, thereby improving the space utilization of the cylindrical battery 2.

[0066] In an embodiment of the present application, by respectively connecting the positive current collector 11 and the negative current collector 12 to the two sides of the insulating protrusion 132, the bare battery cell 21 can adopt a structural design scheme in which the positive electrode tab and the negative electrode tab are led out from the same side, and the positive electrode tab and the negative electrode tab are fixed on the same composite current collecting plate 1, so that the composite current collecting plate 1 only needs to occupy the design space of one current collecting plate and the tab in the height direction of the cylindrical battery 2, thereby reducing the design space occupied in the height direction of the cylindrical battery 2, thereby improving the overall space utilization and energy density of the cylindrical battery 2.

[0067] Figure 5 This is a schematic structural diagram of a positive electrode current collector provided in an embodiment of the present application at a first viewing angle.

[0068] like Figure 5 As shown, the positive electrode current collector 11 includes a first base portion 111, a first support portion 112, and a first connecting portion 113. The first base portion 111 and the first connecting portion 113 are connected to the same side of the first support portion 112, with a gap between the first base portion 111 and the first connecting portion 113. An insulating portion 131 is inserted in the gap between the first base portion 111 and the first connecting portion 113.

[0069] The first base portion 111 and the first connecting portion 113 are respectively connected to the first supporting portion 112 to form the positive current collector 11 into an integral structure, so that each component of the positive current collector 11 has good structural strength, thereby enabling the composite current collecting plate 1 to work normally.

[0070] The first base portion 111 and the first support portion 112, as well as the first connecting portion 113 and the first support portion 112, can be connected in a variety of ways, such as welding, gluing, clamping, etc. The positive electrode current collector 11 can also be formed by folding, stamping, metal injection molding, powder metallurgy, etc., so that the first base portion 111, the first support portion 112 and the first connecting portion 113 are integrated into one, thereby simplifying the connection structure and processing steps of the positive electrode current collector 11, thereby improving the production and processing efficiency of the composite current collector 1.

[0071] The insulating portion 131 is inserted into the gap between the first base portion 111 and the first connecting portion 113, which facilitates the installation and positioning between the insulating portion 131 and the positive electrode current collector 11. This can not only improve the installation and connection accuracy between the insulating portion 131 and the positive electrode current collector 11, but also facilitate the combined assembly of the composite current collecting plate 1, thereby improving the installation efficiency of the composite current collecting plate 1.

[0072] Figure 6 This is a schematic structural diagram of a positive electrode current collector provided in an embodiment of the present application at a second viewing angle.

[0073] See Figure 6 The first base portion 111 is located on the side where the insulating protrusion 132 is located, and is used to connect to the positive terminal of the bare battery cell 21. The first connecting portion 113 is located on the side away from the insulating protrusion 132, and the first connecting portion 113 is at least partially located directly opposite the center of the insulating portion 131, and is used to connect to the terminal of the cylindrical battery 2.

[0074] In an optional embodiment, the first base portion 111 and the positive electrode ear are connected by laser welding. At this time, openings corresponding to the welding position are provided on the first connecting portion 113 and the insulating portion 131, so that the laser welding head can directly contact the welding position of the first base portion 111 to complete the laser welding between the first base portion 111 and the positive electrode ear.

[0075] Since the pole of the cylindrical battery 2 is usually arranged at the center of the cylindrical battery 2, the arrangement in which the first connecting portion 113 is at least partially located directly opposite the center of the insulating portion 131 can make it possible for the first connecting portion 113 to have direct contact with the pole, and a large contact area can be formed between the two, so that a good connection relationship is formed between the first connecting portion 113 and the pole.

[0076] The positive current collector 11 is electrically connected to the bare cell 21 by connecting the first base portion 111 to the positive tab. This allows the positive current collector 11 to function as a current transmission medium, conducting the current generated by the bare cell 21 to an external circuit. The positive current collector 11 is electrically connected to the post by connecting the first connecting portion 113 to the post. This allows the positive tab of the bare cell 21 to communicate with the exterior of the cylindrical battery 2 through the positive current collector 11 and the post.

[0077] Figure 7 This is a schematic structural diagram of a negative electrode current collector provided in an embodiment of the present application at a first viewing angle.

[0078] like Figure 7As shown, the negative electrode current collector 12 includes a second base portion 121, a second support portion 122, and a second connection portion 123. The second base portion 121 and the second connection portion 123 are connected to the same side of the second support portion 122, with a gap between the second base portion 121 and the second connection portion 123. The insulating portion 131 is inserted in the gap between the second base portion 121 and the second connection portion 123.

[0079] The second base portion 121 and the second connecting portion 123 are respectively connected to the second supporting portion 122 to form the negative current collector 12 into an integral structure, so that each component of the negative current collector 12 has good structural strength, thereby enabling the composite current collecting plate 1 to work normally.

[0080] The second base portion 121 and the second support portion 122, as well as the second connecting portion 123 and the second support portion 122 can be connected in a variety of ways, such as welding, gluing, clamping, etc. The negative electrode current collector 12 can also be formed by folding, stamping, metal injection molding, powder metallurgy, etc., so that the second base portion 121, the second support portion 122 and the second connecting portion 123 are integrated into one, thereby simplifying the connection structure and processing steps of the negative electrode current collector 12, thereby improving the production and processing efficiency of the composite current collector 1.

[0081] The insulating portion 131 is inserted into the gap between the second base portion 121 and the second connecting portion 123, which facilitates the installation and positioning between the insulating portion 131 and the negative electrode current collector 12. This can not only improve the installation and connection accuracy between the insulating portion 131 and the negative electrode current collector 12, but also facilitate the combined assembly of the composite current collecting plate 1, thereby improving the installation efficiency of the composite current collecting plate 1.

[0082] Figure 8 This is a schematic structural diagram of a negative electrode current collector provided in an embodiment of the present application at a second viewing angle.

[0083] See Figure 8 The second base portion 121 is located on the side where the insulating protrusion 132 is located, and is used to connect to the negative terminal of the bare battery cell 21. The second connecting portion 123 is located on the side away from the insulating protrusion 132 and is connected to the barrel 22 of the cylindrical battery 2. The second connecting portion 123 avoids the center of the insulating portion 131 to avoid the terminal of the cylindrical battery 2.

[0084] In an optional embodiment, the second base portion 121 and the negative electrode ear are connected by laser welding. At this time, openings corresponding to the welding position are provided on the second connecting portion 123 and the insulating portion 131, so that the laser welding head can directly contact the welding position of the second base portion 121 to complete the laser welding between the second base portion 121 and the negative electrode ear.

[0085] Because the first connection portion 113 is at least partially located directly opposite the center of the insulating portion 131, the arrangement of the second connection portion 123 avoiding the central portion directly opposite the insulating portion 131 can prevent the second connection portion 123 from directly contacting the first connection portion 113, thereby preventing a short circuit between the positive electrode current collector 11 and the negative electrode current collector 12. In addition, because the pole of the cylindrical battery 2 is generally located at the center of the cylindrical battery 2, the arrangement of the second connection portion 123 avoiding the central portion directly opposite the insulating portion 131 can prevent the second connection portion 123 from contacting the pole, thereby preventing a short circuit between the positive and negative poles of the cylindrical battery 2, thereby enabling the cylindrical battery 2 to function normally.

[0086] The negative electrode current collector 12 is electrically connected to the exterior of the bare cell 21 by connecting the second base portion 121 to the negative electrode tab, enabling the negative electrode current collector 12 to function as a current transmission medium, conducting the current generated by the bare cell 21 to the external circuit. The negative electrode current collector 12 is electrically connected to the interior of the bare cell 21 by connecting the second connecting portion 123 to the barrel 22, thereby forming a complete transmission circuit between the composite current collector 1 and the positive and negative electrodes of the bare cell 21, thereby enabling the normal use of the cylindrical battery 2.

[0087] In an optional embodiment, the positive electrode current collector 11 is connected to the positive electrode tab by ultrasonic welding, and the negative electrode current collector 12 is connected to the negative electrode tab by ultrasonic welding. Figure 4 In the above case, the insulating portion 131 has a first connection hole 1311 corresponding to the positive current collector 11, facilitating ultrasonic welding of the positive current collector 11 and the positive tab from the side of the insulating portion 13 away from the bare cell 21. The insulating portion 131 has a second connection hole 1312 corresponding to the negative current collector 12, facilitating ultrasonic welding of the negative current collector 12 and the negative tab from the side of the insulating portion 13 away from the bare cell 21.

[0088] In another optional embodiment, on the basis that the insulating part 131 is provided with a first connection hole 1311 corresponding to the positive current collector 11, and the insulating part 131 is provided with a second connection hole 1312 corresponding to the negative current collector 12, an opening corresponding to the first connection hole 1311 is opened on the first connection part 113, and an opening corresponding to the second connection hole 1312 is opened on the second connection part 123, so that during ultrasonic welding, the positive current collector 11 and the positive electrode ear, and the negative current collector 12 and the negative electrode ear can be welded from the side of the insulating part 13 away from the bare battery cell 21.

[0089] Ultrasonic welding is a technology that uses high-frequency vibration energy to connect solid materials. Ultrasonic welding can be performed in a non-contact manner. The first connection hole 1311 and the second connection hole 1312 prevent the insulating member 13 from interfering with the ultrasonic welding process. This improves the welding effect between the positive electrode current collector 11 and the positive electrode tab, and between the negative electrode current collector 12 and the negative electrode tab, thereby forming a good connection strength. This in turn forms an effective electrical connection between the composite current collector plate 1 and the bare battery cell 21, allowing the cylindrical battery 2 to function properly.

[0090] In an optional embodiment, the positive electrode tab is glued to the positive electrode current collector 11 , and the negative electrode tab is glued to the negative electrode current collector 12 .

[0091] Specifically, a conductive adhesive is provided between the positive electrode tab and the positive electrode current collector 11 , and a conductive adhesive is provided between the negative electrode tab and the negative electrode current collector 12 .

[0092] Conductive glue is an adhesive that has a certain degree of conductivity after curing or drying. The conductive glue can not only form a good connection strength between the positive electrode ear and the positive electrode collector 11, and between the negative electrode ear and the negative electrode collector, but also form an electrical connection relationship, thereby forming a good electrical connection relationship between the composite current collecting plate 1 and the positive and negative electrode ears of the bare battery cell 21, thereby enabling the cylindrical battery 2 to be used normally.

Claims

1. A composite current collecting plate for cylindrical batteries, characterized in that: The battery comprises a positive electrode current collector, a negative electrode current collector and an insulating member, wherein the insulating member comprises an insulating portion and an insulating protrusion provided on the insulating portion, wherein the insulating protrusion is used to be arranged toward the bare battery cell; A portion of the insulating portion located on one side of the insulating protrusion is connected to the positive electrode current collector, and a portion of the insulating portion located on the other side of the insulating protrusion is connected to the negative electrode current collector.

2. The composite collecting plate according to claim 1, characterized in that: The positive electrode current collector includes a first base portion, a first supporting portion, and a first connecting portion, wherein the first base portion and the first connecting portion are connected to the same side of the first supporting portion, and a gap is provided between the first base portion and the first connecting portion; The insulating portion is inserted into a gap between the first base portion and the first connecting portion.

3. The composite collecting plate according to claim 2, characterized in that: The first base portion is located on the side where the insulating protrusion is located, and is used to connect to the positive ear of the bare battery cell; the first connecting portion is located on the side away from the insulating protrusion, and the first connecting portion is at least partially located opposite the center of the insulating portion, and is used to connect to the pole of the cylindrical battery.

4. The composite current collecting plate according to claim 1, characterized in that: The negative electrode current collector includes a second base portion, a second supporting portion, and a second connecting portion, wherein the second base portion and the second connecting portion are connected to the same side of the second supporting portion, and a gap is provided between the second base portion and the second connecting portion; The insulating portion is inserted into a gap between the second base portion and the second connecting portion.

5. The composite current collecting plate according to claim 4, characterized in that: The second base portion is located on the side where the insulating protrusion is located, and is used to connect to the negative electrode ear of the bare battery cell; the second connecting portion is located on the side away from the insulating protrusion and is connected to the barrel of the cylindrical battery. The second connecting portion avoids the center of the insulating portion to avoid the pole of the cylindrical battery.

6. The composite current collecting plate according to any one of claims 1 to 5, characterized in that: The positive electrode current collector and the negative electrode current collector are respectively connected to the insulating member by injection molding, clamping or thermal melting.

7. A cylindrical battery, characterized in that: It comprises a bare battery cell, a barrel and a composite current collecting plate according to any one of claims 1 to 6, wherein the bare battery cell is installed in the barrel and the composite current collecting plate is provided at one end of the barrel; A positive electrode tab and a negative electrode tab are provided on one side of the bare cell close to the composite current collecting disk. The positive electrode tab is connected to the positive current collecting piece, and the negative electrode tab is connected to the negative current collecting piece.

8. The cylindrical battery according to claim 7, characterized in that: The positive electrode current collector is welded to the positive electrode tab, and the negative electrode current collector is welded to the negative electrode tab; The insulating portion is provided with a first connection hole corresponding to the positive current collector, so as to facilitate welding the positive current collector and the positive tab from the side of the insulating portion away from the bare cell; The insulating portion is provided with a second connection hole corresponding to the negative electrode current collector, so as to facilitate welding the negative electrode current collector and the negative electrode ear from a side of the insulating portion away from the bare battery cell.

9. The cylindrical battery according to claim 7, characterized in that: The positive electrode tab is glued to the positive electrode current collector, and the negative electrode tab is glued to the negative electrode current collector.

10. A battery pack, characterized in that: Comprising a cylindrical battery as described in any one of claims 7 to 9.

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