Composite current collector plate, battery and electric device

Abstract

The utility model relates to battery component technical field and provide a kind of composite current collecting plate, battery and electric equipment, the composite current collecting plate includes the positive current collector and negative current collector of interval arrangement, and the insulating part of connecting the positive current collector and negative current collector together;Positive current collector has the pole lug connecting portion of being connected with the positive pole lug welding of pole group, and the pole post connecting portion of being connected with the positive pole post welding, the thickness of pole post connecting portion is greater than the thickness of pole lug connecting portion, negative current collector is used to constitute the connection between the negative pole lug of pole group and battery shell.The composite current collecting plate of the utility model is conducive to the integration design of positive and negative current collecting plate, while reducing the occupancy amount to battery internal space, also conducive to improving the assembly efficiency of battery;Make the thickness of pole post connecting portion greater than the thickness of pole lug connecting portion, while improving the structural strength of welding place, also conducive to reducing the risk of damaging pole lug in welding process, to improve the qualified rate of battery.

Description

Technical Field

[0001] This utility model relates to the field of battery component technology, and in particular to a composite current collector. It also relates to a battery and electrical equipment equipped with the composite current collector. Background Technology

[0002] Currently, in traditional cylindrical batteries, the positive and negative tabs are located at both ends of the electrode assembly, and the positive and negative current collectors are arranged at both ends of the electrode assembly and connected to the corresponding tabs. This structure not only affects the space utilization of the battery, but also requires the installation of current collectors separately during assembly, making the battery assembly process complicated.

[0003] Furthermore, this type of battery structure suffers from a long current flow path and high internal resistance. Increased internal resistance leads to a greater voltage drop within the battery, resulting in a lower output voltage and reduced charging / discharging efficiency, thus affecting battery performance and lifespan. Additionally, the positive current collector's structure has design flaws, leading to suboptimal welding with the positive tab and positive terminal, consequently reducing the battery's yield rate. Utility Model Content

[0004] In view of this, the present invention aims to propose a composite current collector to reduce internal resistance and improve the battery yield.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A composite manifold includes a positive current collector and a negative current collector spaced apart, and an insulating member connecting the positive current collector and the negative current collector together;

[0007] The positive current collector has a tab connection portion welded to the positive tab of the electrode assembly, and a post connection portion welded to the positive post, wherein the thickness of the post connection portion is greater than the thickness of the tab connection portion.

[0008] The negative current collector is used to form the connection between the negative electrode tab of the electrode assembly and the battery casing.

[0009] Furthermore, the insulating element is annular, the positive current collector is disposed on the inner side of the insulating element, and the negative current collector is disposed on the outer side of the insulating element, and is continuously disposed along the circumference of the insulating element.

[0010] Furthermore, the tab connection portion is circular and conforms to the shape of the inner side of the insulating member, and the pole connection portion is located in the middle of the tab connection portion.

[0011] Furthermore, the positive current collector has a protrusion that arches away from the positive electrode tab, the protrusion is hollow inside and has a sidewall arranged along its own circumference, and a connecting wall provided at the end of the sidewall, the connecting wall being used to form the electrode connection part; and / or, the outer edge of the negative current collector is provided with a flange, and is connected to the battery casing through the flange.

[0012] Furthermore, the tab connection portion is sheet-shaped, and the thickness d1 of the tab connection portion is between 0.2mm and 0.4mm; and / or, the thickness d2 of the pole connection portion is between 0.8mm and 1.5mm.

[0013] Furthermore, the insulating component is integrally injection molded and connects the positive current collector and the negative current collector.

[0014] Furthermore, the tab connection portion and the negative current collector are respectively provided with bent portions at their edges facing the insulating component; the positive current collector and the negative current collector are injection molded together with the insulating component through the corresponding bent portions.

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] The composite current collector of this invention connects the positive and negative current collectors together through an insulating component, facilitating the integrated design of the positive and negative current collectors. Compared to the traditional method of distributing the positive and negative current collectors at both ends of the electrode assembly, this reduces internal resistance, minimizes the space occupied inside the battery, simplifies assembly processes, and improves battery assembly efficiency. Furthermore, the thickness d1 of the electrode post connection is greater than the thickness d2 of the tab connection, which enhances the structural strength of the weld joint and reduces the risk of damaging the tab during the welding process between the positive electrode post and the positive current collector, thereby improving the battery's yield rate.

[0017] The annular insulating component, with a positive current collector inside and a negative current collector outside, facilitates the rational arrangement of the composite current collector. The negative current collector is a single, continuous element along the circumference of the insulating component, reducing the number of components, improving assembly efficiency, and enhancing the structural reliability of the composite current collector. The tab connection portion is circular, conforming to the inner shape of the insulating component, matching the internal shape of the cylindrical battery. This better adapts to the spatial structure of the cylindrical battery, resulting in a tighter fit between the composite current collector and the internal battery components, improving the overall stability and compactness of the battery structure. The terminal connection portion is located in the middle of the tab connection portion, facilitating connection with the central positive terminal.

[0018] By creating a hollow protrusion on the positive current collector, the connecting wall on the protrusion forms the electrode connection part. This facilitates the connection between the positive current collector and the positive electrode post while further reducing internal resistance, thereby reducing energy loss during battery charging and discharging and improving battery charging and discharging efficiency. The flange facilitates the connection between the negative current collector and the battery casing. The tab connection part is sheet-like with a thickness d2 between 0.2mm and 0.4mm, which reduces the welding energy required for welding, thus reducing the risk of damaging the positive tab during welding. The electrode connection part has a thickness d1 between 0.8mm and 1.5mm, which further ensures the welding quality between the connecting wall and the positive electrode post, and reduces the risk of damage to the positive tab during welding of the positive electrode post and positive current collector, thereby improving the battery yield.

[0019] This design allows the insulating components to be integrally injection molded, while connecting the positive and negative current collectors improves the processing efficiency of the composite current collector. The high connection strength between the three components also simplifies the assembly process, further enhancing assembly efficiency. The positive and negative current collectors are injection molded together with the insulating components through corresponding bends, which strengthens the connection between the positive current collector and the insulating components, as well as between the insulating components and the negative current collector, thereby improving the structural reliability of the composite current collector.

[0020] In addition, another objective of this utility model is to provide a battery, including an electrode assembly and a composite current collector as described above; the positive electrode tab of the electrode assembly is connected to the electrode tab connection portion, and the negative electrode tab of the electrode assembly is connected to the negative current collector.

[0021] Furthermore, at least one of the positive electrode tab and the negative electrode tab has a thickness between 0.5 mm and 1.8 mm; and / or, the positive electrode tab is correspondingly provided with the electrode tab connection portion, and the negative electrode tab is correspondingly provided with the negative current collector.

[0022] The battery described in this utility model, by setting the above-mentioned composite current collector, helps to improve the assembly efficiency and pass rate of the battery, thereby helping to reduce production costs.

[0023] The thickness of the positive and negative tabs is between 0.5mm and 1.8mm, which helps to ensure the overcurrent energy and prevent damage to the tabs during welding. It also helps to improve the connection strength with the composite current collector. The positive and negative tabs are set to correspond to the positive and negative current collectors, which helps to realize the connection between the tabs and the current collectors.

[0024] In addition, this utility model also proposes an electrical device, including the battery described above.

[0025] The electrical equipment described in this utility model, by incorporating the aforementioned battery, helps to improve the product qualification rate of the electrical equipment and reduce production costs. Attached Figure Description

[0026] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0027] Figure 1 This is a schematic diagram of the composite collector disk described in Embodiment 1 of this utility model;

[0028] Figure 2 This is a cross-sectional view of the composite collector disk described in Embodiment 1 of this utility model;

[0029] Figure 3 This is a schematic diagram of the negative current collector structure described in Embodiment 1 of this utility model;

[0030] Figure 4 This is a cross-sectional view of the negative current collector described in Embodiment 1 of this utility model;

[0031] Figure 5 This is a schematic diagram of the structure of the positive current collector described in Embodiment 1 of this utility model;

[0032] Figure 6 This is a cross-sectional view of the positive current collector described in Embodiment 1 of this utility model;

[0033] Figure 7 This is a schematic diagram of the structure of the insulating component described in Embodiment 1 of this utility model;

[0034] Figure 8 This is a cross-sectional view of the insulating component described in Embodiment 1 of this utility model;

[0035] Figure 9 This is a schematic diagram of the battery structure described in Embodiment 2 of this utility model.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Composite current collector; 2. Battery casing; 3. Electrode assembly;

[0038] 101. Positive current collector; 1011. Electrode connection portion; 10111. First bend portion; 1012. Electrode post connection portion; 1013. Protrusion; 10131. Side wall; 102. Insulating component; 1021. First groove; 1022. Second groove; 103. Negative current collector; 1031. Second bend portion; 1032. Flanged edge;

[0039] 301, positive electrode; 302, negative electrode. Detailed Implementation

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0041] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0042] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0044] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Example 1

[0045] This embodiment relates to a composite current collector 1 to solve the problems of low assembly efficiency, high internal resistance, and low yield rate in the prior art where positive and negative current collectors are set separately in cylindrical batteries.

[0046] In terms of overall structure, the composite current collector 1 includes a positive current collector 101 and a negative current collector 103 spaced apart, and an insulating member 102 connecting the positive current collector 101 and the negative current collector 103 together. The positive current collector 101 has a tab connection portion 1011 welded to the positive tab 301 of the electrode assembly 3, and a post connection portion 1012 welded to the positive post, wherein the thickness d1 of the post connection portion 1012 is greater than the thickness d2 of the tab connection portion 1011; the negative current collector 103 is used to form the connection between the negative tab 302 of the electrode assembly 3 and the battery casing 2.

[0047] The composite current collector 1 described in this embodiment connects the positive current collector 101 and the negative current collector 103 together through the insulating component 102, which facilitates the integrated design of the positive and negative current collectors. Compared with the traditional method of distributing the positive and negative current collectors 103 at both ends of the electrode group 3, this reduces internal resistance, increases the amount of space occupied inside the battery, and simplifies the assembly process, thereby improving the battery assembly efficiency. The thickness d1 of the electrode post connection portion 1012 is greater than the thickness d2 of the electrode tab connection portion 1011, which improves the structural strength of the weld joint and reduces the risk of damaging the electrode tab during the welding process between the positive electrode post and the positive current collector 101, thereby improving the battery yield.

[0048] Based on the above overall introduction, an exemplary result of the composite manifold 1 described in this embodiment is as follows: Figures 1 to 8 As shown in the image.

[0049] In a preferred embodiment, the insulating member 102 is annular, with a positive current collector 101 disposed on the inner side of the insulating member 102 and a negative current collector 103 disposed on the outer side of the insulating member 102, and both are continuously arranged along the circumference of the insulating member 102. Here, the annular insulating member 102, the positive current collector 101 disposed on the inner side of the insulating member 102, and the negative current collector 103 disposed on the outer side of the insulating member 102 facilitate the rational arrangement of the composite current collector 1, and the fact that the negative current collector 103 is continuously arranged along the circumference of the insulating member 102 helps to reduce the number of parts and improve assembly efficiency, while also improving the structural reliability of the composite current collector 1.

[0050] like Figures 2 to 4 As shown, the negative current collector 103 is annular, which facilitates the connection between the negative electrode tab 302 and the negative current collector 103. It is only necessary to ensure that the negative electrode tab 302 can be welded to the negative current collector 103. The annular negative current collector 103 here has good connection flexibility.

[0051] like Figure 2 , Figure 5 and Figure 6 As shown in the diagram, in this embodiment, the tab connection portion 1011 is circular and conforms to the shape of the inner side of the insulating member 102, while the terminal connection portion 1012 is located in the middle of the tab connection portion 1011. The circular shape of the tab connection portion 1011 conforming to the inner side of the insulating member 102 matches the internal shape of the cylindrical battery, facilitating better adaptation to the spatial structure of the cylindrical battery. This allows for a tighter fit between the composite current collector 1 and the internal components of the battery, improving the overall stability and compactness of the battery structure. The terminal connection portion 1012, located in the middle of the tab connection portion 1011, facilitates connection to the positive terminal in the center.

[0052] In a preferred embodiment, the positive current collector 101 has a protrusion 1013 arching away from the positive electrode tab 301. The protrusion 1013 is hollow inside and has a sidewall 10131 arranged circumferentially thereon, as well as a connecting wall at the end of the sidewall 10131. The connecting wall is used to form the electrode connection portion 1012. Here, by providing the hollow protrusion 1013 on the positive current collector 101, and the connecting wall on the protrusion 1013 forming the electrode connection portion 1012, it is beneficial to realize the connection between the positive current collector 101 and the positive electrode, while also reducing the internal resistance, thereby reducing the energy loss of the battery during charging and discharging, and improving the charging and discharging efficiency of the battery.

[0053] In terms of specific structure, such as Figure 5 and Figure 6 As shown, the positive current collector 101 is located in the middle of the aforementioned protrusion 1013, which corresponds to the position of the positive electrode post. This facilitates the welding between the electrode post connection portion 1012 and the positive electrode post. Due to the protrusion 1013, the position of the connecting wall is closer to the welding portion on the electrode post, thereby facilitating the welding of the positive electrode post to the connecting wall. Furthermore, the welding position is further away from the positive electrode tab 301, which also helps to further reduce the impact of welding on the electrode tab.

[0054] Meanwhile, by placing the electrode connection portion 1012 on the connection wall, compared to a design without the protrusion 1013, it is possible to reduce the size of the positive electrode post inside the battery, thereby reducing its weight and facilitating battery weight reduction. Furthermore, the positive current collector 101 is preferably integrally molded to improve production efficiency. Alternatively, the electrode connection portion 1011 and the protrusion 1013 can be molded separately and then welded together, which also meets the usage requirements.

[0055] As a preferred implementation method, such as Figure 6 As shown, the tab connection portion 1011 is sheet-shaped, and its thickness d2 is between 0.2mm and 0.4mm. This configuration allows the laser to reach the tab connection portion 1011 first during welding of the positive tab 301. When the thickness d2 of the tab connection portion 1011 is between 0.2mm and 0.4mm, the welding energy required for welding is reduced, thereby minimizing the risk of damaging the positive tab 301 during the welding process. In specific implementations, the thickness d2 of the tab connection portion 1011 can be, for example, 0.2mm, 0.22mm, 0.25mm, 0.28mm, 0.3mm, 0.35mm, 0.38mm, or 0.4mm.

[0056] In a preferred embodiment, the thickness d1 of the electrode connection portion 1012 is between 0.8mm and 1.5mm. When welding the electrode to the electrode connection portion 1012, a through-welding process is typically used. When the thickness d1 of the electrode connection portion 1012 is between 0.8mm and 1.5mm, it helps prevent laser penetration of the electrode connection portion 1012 and loss of the positive electrode tab 301, thereby improving the battery's yield rate and increasing the connection strength between the positive electrode and the positive electrode tab 301. Specifically, the thickness d1 of the electrode connection portion 1012 can be, for example, 0.8mm, 0.85mm, 0.9mm, 1mm, 1.2mm, 1.4mm, 1.45mm, or 1.5mm.

[0057] In this embodiment, the thickness of the tab connection portion 1011 and the terminal connection portion 1012 is different. Compared with the prior art where both have the same thickness, this embodiment has a better improvement in terms of welding effect, required welding energy, and loss of positive tab 301. This makes the installation of positive current collector 101 not only require less welding energy, but also reduces the probability of damage to positive tab 301 during the welding process, thereby improving the battery's pass rate and safety.

[0058] In a preferred embodiment, the insulating component 102 is integrally injection molded and connected to the positive current collector 101 and the negative current collector 103. This improves the processing efficiency of the composite current collector 1, enhances the connection strength between the three components, simplifies the assembly process, and thus improves assembly efficiency.

[0059] To further improve the reliability of the composite manifold 1, in this embodiment, as follows: Figure 2 As shown, the tab connection portion 1011 and the negative current collector 103 are respectively provided with bent portions on the edges facing the insulating member 102; the positive current collector 101 and the negative current collector 103 are injection molded together with the insulating member 102 through the corresponding bent portions.

[0060] Here, the positive current collector 101 and the negative current collector 103 are injection molded together with the insulating component 102 through corresponding bending portions, which helps to improve the connection strength between the positive current collector 101 and the insulating component 102, as well as between the insulating component 102 and the negative current collector 103, thereby improving the structural reliability of the composite current collector 1.

[0061] For easy distinction, such as Figure 2As shown, the bent portion located at the outer edge of the positive current collector 101 is referred to as the first bent portion 10111, and the bent portion located at the inner edge of the negative current collector 103 is referred to as the second bent portion 1031. The cross-sectional shape of each bent portion is "L"-shaped, and it has a first segment extending downward, and a second segment connected to the bottom end of the first segment and extending radially toward the insulating member 102 along the composite current collector 1.

[0062] When injection molding the insulating component 102, the positive current collector 101 and the negative current collector 103 are first placed in the injection molding equipment so that all bent parts are located in the molding cavity. After injection molding material is injected and cured, the insulating component 102 is obtained. Figure 7 and Figure 8 As shown, the inner edge of the molded insulating part 102 has a first groove 1021 that mates with the first bent portion 10111, and the outer edge of the insulating part 102 has a second groove 1022 that mates with the second bent portion 1031. Furthermore, the radial cross-sections of both the first groove 1021 and the second groove 1022 are "L"-shaped, adapted to fit the bent portion.

[0063] In this embodiment, the shapes of each bent portion are simple, facilitating processing and forming. This also benefits the forming of the insulating component 102 while further improving the connection strength and production efficiency between the positive current collector 101, the insulating component 102, and the negative current collector 103. Furthermore, the fit between each bent portion and its corresponding groove helps ensure the structural strength of the integral injection molding, while also preventing short circuits between the positive current collector 101 and the negative current collector 103 due to contact.

[0064] In addition, such as Figure 3 As shown, the outer edge of the negative current collector 103 is provided with a flange 1032, and is connected to the battery casing 2 through the flange 1032. The flange 1032 here has a simple structure, is easy to form, and facilitates the connection between the negative current collector 103 and the battery casing 2. Specifically, as shown... Figure 2 As shown, the flange 1032 is folded outward along the outer edge of the entire negative current collector 103. The flange 1032 also helps to increase the contact area with the battery housing 2, further improving the welding strength and connection reliability with the battery housing 2.

[0065] In this embodiment, the composite current collector integrates an insulating element 102, a negative current collector 103, and a positive current collector 101, reducing the number of components and improving assembly efficiency. Furthermore, the co-positioning of the positive tab 301 and negative tab 302 at one end of the electrode assembly 3 reduces internal resistance, thereby improving battery electrical performance. A protrusion 1013 is specifically provided on the positive current collector 101, and the terminal connection portion 1012 is positioned on the end face of the protrusion 1013. This facilitates connection to the positive terminal while also limiting the thickness of the tab connection portion 1011 and the terminal connection portion 1012 to meet welding requirements and prevent damage to the tabs, thus improving the battery's yield rate. Example 2

[0066] This embodiment relates to a battery, including an electrode group 3 and a composite current collector 1 as in Embodiment 1. The positive electrode tab 301 of the electrode group 3 is connected to the electrode tab connection portion 1011, and the negative electrode tab 302 of the electrode group 3 is connected to the negative current collector 103.

[0067] As an example of a structure, such as Figure 9 As shown, electrode assembly 3 is located inside battery casing 2, with positive tab 301 and negative tab 302 located at the same end of electrode assembly 3. In a preferred embodiment, positive tab 301 is correspondingly positioned with tab connection portion 1011, and negative tab 302 is correspondingly positioned with negative current collector 103. Specifically, positive tab 301 is circular, corresponding vertically to tab connection portion 1011, and negative tab 302 is annular, corresponding vertically to negative current collector 103. This facilitates improved connection convenience and stability between positive tab 301 and tab connection portion 1011, and between negative tab 302 and negative current collector 103. In practice, positive tab 301 and negative tab 302 can be kneaded into their corresponding shapes.

[0068] Furthermore, the positive tab 301 and the tab connection portion 1011, as well as the negative tab 302 and the negative current collector 103, are connected by laser welding. In a preferred embodiment, at least one of the positive tab 301 and the negative tab 302 has a thickness between 0.5mm and 1.8mm. This thickness range of the positive tab 301 and the negative tab 302 helps ensure the current carrying capacity of the product and prevents the laser from penetrating the tabs during welding and damaging the electrode sheets in the electrode assembly 3, thereby improving the battery's yield and safety. Specifically, the thickness of the positive tab 301 and the negative tab 302 can be, for example, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.5mm, or 1.8mm. Of course, a solution where only one of the positive tab 301 and the negative tab 302 has a thickness between 0.5mm and 1.8mm is also feasible.

[0069] The battery described in this embodiment, by setting the composite current collector 1 as described above, helps to improve the battery assembly efficiency and yield, thereby helping to reduce production costs. Example 3

[0070] This embodiment relates to an electrical device, including the battery in Embodiment 2.

[0071] The electrical equipment described in this embodiment, by incorporating the aforementioned battery, helps to improve the product qualification rate of the electrical equipment and reduce production costs.

[0072] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A composite current collector, characterized in that: It includes a positive current collector and a negative current collector spaced apart, and an insulating member connecting the positive current collector and the negative current collector together; The positive current collector has a tab connection portion welded to the positive tab of the electrode assembly, and a post connection portion welded to the positive post, wherein the thickness of the post connection portion is greater than the thickness of the tab connection portion. The negative current collector is used to form the connection between the negative electrode tab of the electrode assembly and the battery casing.

2. The composite manifold according to claim 1, characterized in that: The insulating element is annular, the positive current collector is located on the inner side of the insulating element, the negative current collector is located on the outer side of the insulating element, and the negative current collector is a single element continuously arranged along the circumference of the insulating element.

3. The composite manifold according to claim 2, characterized in that: The tab connection portion is circular and is disposed on the inner side of the insulating member, and the pole connection portion is disposed in the middle of the tab connection portion.

4. The composite manifold according to claim 1, characterized in that: The positive current collector has a protrusion that arches away from the positive electrode tab. The protrusion is hollow and has sidewalls arranged circumferentially, as well as a connecting wall at the end of the sidewalls. The connecting wall forms the electrode connection portion; and / or, The outer edge of the negative current collector is provided with a flange, and is connected to the battery casing through the flange.

5. The composite manifold according to claim 1, characterized in that: The tab connection portion is sheet-shaped, and the thickness of the tab connection portion is between 0.2mm and 0.4mm; and / or, The thickness of the pole connection portion is between 0.8mm and 1.5mm.

6. The composite manifold according to any one of claims 2 to 5, characterized in that: The insulating component is integrally injection molded and connects the positive current collector and the negative current collector.

7. The composite manifold according to claim 6, characterized in that: The electrode connection portion and the negative current collector have bent portions on their edges facing the insulating component; The positive current collector and the negative current collector are injection molded together with the insulating component through the corresponding bent portions.

8. A battery, characterized in that: Includes a pole group, and a composite current collector as described in any one of claims 1 to 7; The positive electrode tab of the electrode group is connected to the electrode tab connection portion, and the negative electrode tab of the electrode group is connected to the negative current collector.

9. The battery according to claim 8, characterized in that: The thickness of at least one of the positive electrode tabs and the negative electrode tabs is between 0.5 mm and 1.8 mm; and / or, The positive electrode tab is correspondingly provided with the electrode tab connection portion, and the negative electrode tab is correspondingly provided with the negative current collector.

10. An electrical appliance, characterized in that: Includes the battery as described in claim 8 or 9.

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