A battery current collector and a battery

Abstract

The application relates to the technical field of batteries, in particular to a battery current collecting disc and a battery. The battery current collecting disc comprises copper, and the battery current collecting disc comprises an electric connection part used for realizing electric connection of a cell tab and an electrode terminal; a color parameter of a surface of the electric connection part used for connection with the cell tab and / or the electrode terminal comprises L1 and a1, L1 is a value of an L channel in a Lab color space, a1 is a value of an a channel in the Lab color space, wherein S=L1a1, 900<=S<=2500. By controlling the product S of L1 and a1 of the surface of the electric connection part within a proper range, the reflection can be reduced, the quality and stability of welding can be improved, and the structural strength of the battery current collecting disc can be ensured.

Description

[0001] This application is a divisional application. The original application has the application number 202411775723.9 and the original application date is December 5, 2024. The original application is entitled "A Battery Current Collector and Battery". The entire contents of the original application are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery current collector and a battery. Background Technology

[0003] A battery, such as a cylindrical battery, includes a casing, end caps, a cell, and a current collector. The end caps are fixedly connected to the open end of the casing to form a sealed cavity. The cell is located inside the sealed cavity. The current collector is located at at least one end of the cell and is used to connect the tabs of the cell to the end caps or the casing. The connection between the current collector and the tabs is usually achieved using laser welding technology.

[0004] The material used to prepare the manifold is generally metal, such as copper. Due to the high reflectivity of copper, some of the laser light source will be reflected during laser welding, resulting in the temperature and energy of the remaining light source being unconcentrated, thus affecting the welding effect. Summary of the Invention

[0005] This application discloses a battery current collector and a battery, which solves the problem that the high reflectivity of the current collector leads to poor welding results.

[0006] To achieve the above objectives, this application provides the following technical solution: In a first aspect, this application provides a battery current collector, which includes copper and an electrical connection portion for electrically connecting a battery cell tab and an electrode terminal. The color parameters of the surface of the electrical connection portion used for connecting to the battery cell tab and / or the electrode terminal include L1 and a1, where L1 is the value of the L channel in the Lab color space, and a1 is the value of the a channel in the Lab color space, wherein S=L1. a1, 900≤S≤2500.

[0007] In the battery current collector provided in this application, the larger L1 is, the higher the gloss of the surface of the electrical connection part, resulting in severe reflection. To reduce L1, specific treatments can be used, such as cleaning and passivating the surface of the electrical connection part or chemical etching, to reduce the gloss of the surface of the electrical connection part and thus reduce reflection. However, L1 cannot be too small, as specific treatments on the electrical connection part will cause a deterioration in the structural strength and mechanical properties of the battery current collector, increasing the risk of breakage of the battery current collector during welding. In addition, the reflectivity of the surface of the electrical connection part can also be improved by controlling the color of the battery current collector. By comprehensively controlling the product S of L1 and a1 within an appropriate range, reflection can be reduced, welding quality and stability can be improved, and the structural strength of the battery current collector can be guaranteed.

[0008] Secondly, this application provides a battery including a casing, an end cap, a cell, and a battery current collector as described in the first aspect. The casing and the end cap enclose a cavity to accommodate the cell and the battery current collector. The cell includes a cell tab, and the casing includes electrode terminals. Electrical connection portions are electrically connected to the cell tab and the electrode terminals, respectively.

[0009] In the battery provided in this application, during the welding of the battery current collector and the cell tabs or electrode terminals, a specific treatment, such as chemical etching of copper, is applied to reduce the color parameter L1 on the surface of the electrical connection, thereby reducing the gloss of the electrical connection of the battery current collector and reducing reflection. However, L1 cannot be too small, as this would cause a decrease in the structural strength and mechanical properties of the battery current collector. In addition, the degree of reflection on the surface of the electrical connection can also be improved by controlling the color of the battery current collector. By comprehensively controlling the product S of L1 and a1 within a suitable range, reflection can be reduced, the quality and stability of welding can be improved, and the structural strength of the battery current collector can be guaranteed, thereby improving the quality and stability of welding and ultimately improving the performance of the battery. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of a battery current collector according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a battery current collector according to another embodiment of this application; Figure 3 This is a side view of a battery current collector according to an embodiment of this application; Figure 4 This is a side view of a battery current collector according to another embodiment of this application; Figure 5 This is a schematic diagram of the structure of a battery current collector according to another embodiment of this application; Figure 6 This is a schematic diagram of the structure of a battery according to one embodiment of this application; Figure 7This is a schematic diagram of the battery structure according to another embodiment of this application; Figure 8 This is a schematic diagram of the structure of an adapter piece according to an embodiment of this application.

[0011] Reference numerals: 100-Battery current collector; 101-Positive current collector; 102-Negative current collector; 103-Insulating plate; 110-Passivation region; 111-Electrical connection part; 120-Non-passivation region; 130-First connecting piece; 140-Second connecting piece; 10-Battery; 11-Casing; 12-End cap. Detailed Implementation

[0012] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0013] To facilitate understanding of the technical solutions in this application, the application scenarios of the data collection disk will be explained first.

[0014] The battery includes a cell, an end cap, and a casing for encapsulating the cell. The end cap snaps onto an opening in the casing to form a cavity for encapsulating the cell. The cell includes tabs, and a current collector is located at at least one end of the cell. The current collector connects the tabs to the end cap or casing. The connection between the current collector and the tabs is typically achieved using laser welding technology. The current collector is usually made of a metal, such as copper. Due to copper's high reflectivity, some of the laser light source is reflected during laser welding, resulting in a dispersion of temperature and energy from the remaining light source, thus affecting the welding effect.

[0015] In view of this, this application provides a battery current collector. Figure 1 This is a schematic diagram of the structure of a battery current collector according to an embodiment of this application. Figure 2 This is a schematic diagram of the battery current collector according to another embodiment of this application. Figure 3 This is a side view of a battery current collector according to one embodiment of this application. Figure 4 This is a side view of a battery current collector according to another embodiment of this application, with reference to... Figures 1 to 4 The battery current collector includes copper and an electrical connection portion for electrically connecting the cell tabs and electrode terminals. The color parameters of the surface of the electrical connection portion used for connecting to the cell tabs and / or electrode terminals include L1 and a1, where L1 is the value of the L channel in the Lab color space, and a1 is the value of the a channel in the Lab color space, where S=L1. a1, 900≤S≤2500.

[0016] Lab is a device-independent color model. The Lab color model consists of three elements (or channels): luminance (L) and color-related channels a and b. L represents luminance, and a represents the range from magenta to green. The value of L ranges from 0 to 100; L = 50 is equivalent to 50% black. The value of a ranges from +127 to -128, where +127a is red, gradually transitioning to -128a as green. All colors are composed of variations of these three values. The channels for the target Lab value are denoted as L1, a1, and b1.

[0017] Understandably, a larger L1 indicates higher brightness and gloss on the surface of the electrical connection, leading to increased reflected laser energy and laser beam instability, which affects the continuity and stability of the welding process. To reduce L1, specific treatments can be used, such as cleaning and passivating the surface of the electrical connection or chemical etching, to reduce surface gloss and thus reduce reflection. However, excessive treatment may degrade the structural strength and mechanical properties of the battery current collector, increasing the risk of breakage during welding. Alternatively, the color of the battery current collector can be controlled, for example, by reducing the a1 value of the electrical connection surface (i.e., darkening the surface color), to improve surface reflectivity. By comprehensively controlling the product S of L1 and a1 within a suitable range, reflection can be reduced, welding quality and stability improved, and the structural strength of the battery current collector ensured, minimizing the impact on the welding process.

[0018] The electrode terminals are used to connect the battery to an external circuit. Specifically, the electrode terminals can be posts mounted on the battery casing, or the battery casing itself can serve as the electrode terminals. The electrode terminals include positive and negative terminals.

[0019] The battery cell tabs include a positive tab and a negative tab. The positive and negative tabs can be located on the same side of the battery cell, or they can be located on opposite sides. When the positive and negative tabs are located on the same side of the battery cell, the battery current collector is located on the side of the battery cell closest to the tabs, and as... Figure 1 As shown, the battery current collector includes a positive current collector, a negative current collector, and an insulating plate. The positive current collector is used for electrical connection between the positive electrode tab and the positive terminal, and the negative current collector is used for electrical connection between the negative electrode tab and the negative terminal. The insulating plate is disposed between the positive current collector and the negative current collector to isolate them.

[0020] Understandably, the shape and size of the battery current collector are determined based on the type and size of the battery. For example, when the battery is cylindrical, such as... Figure 1As shown, the battery current collector can be circular, while the positive current collector, negative current collector, and insulating plate are all fan-shaped. The dimensions of the three are designed according to actual needs.

[0021] In the optional embodiment, the material for manufacturing the battery current collector includes copper, meaning that the material for manufacturing the battery current collector can be pure copper or a copper alloy.

[0022] In the optional scheme of this embodiment, when 1100≤S≤2000, the battery current collector has better welding effect and structural strength.

[0023] Where 60≤L1≤90, for example, L1 can be 60, 62, 64, 66, 70, 75, 80, 85, 90, or any other value between 60 and 90. When L1 is too large, the reflection is severe, and the welding effect is poor when the battery current collector is electrically connected to the cell tabs or electrode terminals; conversely, when L1 is too small, although the reflection phenomenon is alleviated, the structural strength of the battery current collector may not be guaranteed.

[0024] Where 12≤a1≤32, for example, a1 can be 12, 16, 18, 20, 22, 24, 26, 28, 32 or any other value between 14 and 32.

[0025] In the optional scheme of this embodiment, 70≤L1≤85, 14≤a1≤25. When L1 and a1 meet the above conditions, the battery current collector has better welding effect and higher structural strength.

[0026] Figure 5 This is a schematic diagram of the battery current collector according to another embodiment of this application, with reference to... Figure 5 The battery current collector includes a passivation region, and at least one surface of the passivation region is provided with a passivation layer. The passivation region is the electrical connection part in this application. This application does not limit the ratio of the area of ​​the passivation region to the area of ​​the battery current collector; it can be set according to actual needs, as long as the area used for welding is provided with a passivation layer.

[0027] It should be noted that this application does not limit the method for preparing the passivation layer. For example, the passivation layer can be prepared by chemical etching or cleaning passivation. When preparing the passivation layer by chemical etching, the specific steps include: 1) Perform surface pretreatment on the battery current collector to remove oil, oxides or other impurities from the surface of the battery current collector, thereby ensuring the quality of the passivation layer.

[0028] 2) Passivation treatment, which involves immersing the passivation area in a passivation solution or forming a passivation layer on at least one surface of the passivation area through electrochemical means. Commonly used passivation solutions include, but are not limited to, chromates, nitrates, and phosphates.

[0029] 3) Cleaning and drying: Clean the battery current collector with clean water to remove any passivation solution residue on the surface of the battery current collector. Then, dry the battery current collector to prevent moisture residue.

[0030] In this application, the adjustment methods of L1 and a1 are not limited. Specifically, L1 can be adjusted by the passivation time, and the value of a1 can be adjusted by the concentration of the passivation solution.

[0031] It is understandable that the passivation region may have a passivation layer on only one surface. For example, the surface of the passivation region that connects to the battery tab may have a passivation layer, or the surface of the passivation region that connects to the electrode terminal may have a passivation layer. Of course, the passivation region may also have passivation layers on two opposite surfaces.

[0032] In particular, the passivation region has a passivation layer on only one surface, which can improve the structural strength of the battery current collector and prevent corrosion on both sides of the battery current collector. If the structural strength of the battery current collector is too low, the risk of breakage and other damage will increase.

[0033] To prevent chemical corrosion of the passivation region surface, which could lead to insufficient structural strength of the battery current collector, the ratio ρ of the passivation layer thickness to the battery current collector thickness is set between 0.04 and 0.6. The passivation layer thickness is calculated using a scanning electron microscope or a film thickness gauge.

[0034] Understandably, when ρ is too large, the passivation layer becomes too thick, resulting in greater corrosion intensity on the surface of the battery current collector. This weakens the structural strength of the current collector, increasing the risk of breakage. Furthermore, an excessively thick passivation layer can affect the current flow of the current collector. Conversely, when ρ is too small, the passivation layer becomes too thin, leading to lower corrosion on the surface of the current collector, higher gloss, and less improvement in reflectivity.

[0035] The battery current collector can consist only of the passivation area, meaning the entire surface of the battery current collector is covered with a passivation layer, or it can have only a portion of its surface covered with a passivation layer, such as... Figure 5 As shown, the battery current collector also includes a non-passivated area connected to the passivation area. That is, part of the surface of the battery current collector is covered with an electrical connection part, which avoids chemical corrosion of the entire surface of the battery current collector. Only the surface of the area used for electrical connection with the cell tab or electrode terminal is chemically corroded. This can reduce the reflection phenomenon during laser welding and ensure that the battery current collector as a whole has high structural strength.

[0036] When the battery current collector includes a non-passivated region, the ratio ρ of the passivation layer thickness to the battery current collector thickness ranges from 0.057 to 0.6. The non-passivated region has higher structural strength, thus ensuring higher overall structural strength of the battery current collector. Therefore, the passivation layer thickness in the passivation region can be set to be thicker to improve the reflectivity of the electrical connection.

[0037] In this embodiment, the ratio r of the passivated and non-passivated areas can be 0.1-0.9. When r is less than 0.1, the area of ​​the electrical connection is too small, resulting in insufficient welding area and insufficient current flow area. Conversely, when r is greater than 0.9, the area of ​​the electrical connection is too large, the area of ​​the chemically etched region on the surface of the battery current collector is too large, and the structural strength of the battery current collector deteriorates.

[0038] It is understood that the shape of the passivation area is not limited in this application. The shape of the passivation area can be circular, square, or fan-shaped, etc., and can be set according to actual needs.

[0039] When the thickness of the battery current collector is less than or equal to 0.4 mm, 900≤S≤2000.

[0040] In an optional embodiment, the insulation resistance R of the electrical connection is 1.5-3.5 GΩ. For example, R can be any other value between 1.5, 1.8, 2.0, 2.2, 2.4, 2.6, 2.8, 3.0, 3.5, or 1.5-3.5. The insulation resistance R of the electrical connection is measured using an internal resistance tester.

[0041] Based on the same technical concept, this application also provides a battery. Figure 6 This is a schematic diagram of the structure of a battery according to an embodiment of this application, with reference to... Figure 6 The battery includes a casing, an end cap, a cell, and a battery current collector in various possible embodiments of this application. The casing and the end cap enclose a cavity to accommodate the cell and the battery current collector. The cell includes a cell tab, and the end cap includes an electrode terminal. Electrical connection portions are electrically connected to the cell tab and the electrode terminal, respectively.

[0042] Because the battery current collector included in this application can reduce the reflection phenomenon during laser welding, improve the quality and stability of welding, the performance of the battery in this application is also improved.

[0043] The battery cell includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the positive and negative electrode. The positive electrode, negative electrode, and separator are formed by winding or stacking to form the battery cell. The positive electrode includes a positive current collector and a positive active material layer, and the negative electrode includes a negative current collector and a negative active material layer. There are no particular limitations on the positive current collector, as long as it is conductive and does not cause adverse chemical changes in the battery. Specifically, the material used to prepare the positive current collector can be stainless steel, aluminum, nickel, titanium, sintered carbon, or aluminum or stainless steel that has undergone at least one surface treatment of carbon, nickel, titanium, silver, etc. The material used to prepare the negative current collector is selected from copper, stainless steel, nickel, titanium, etc. In a specific embodiment, the positive current collector can be aluminum, and the negative current collector can be copper. The positive electrode active material layer includes positive electrode active materials, such as nickel-cobalt-manganese ternary materials, lithium iron phosphate materials, and lithium manganese iron phosphate materials; the negative electrode active material layer includes negative electrode active materials, such as artificial graphite, natural graphite, and silicon-based materials. Therefore, the batteries in this application include, but are not limited to, lithium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, and alkaline dry batteries.

[0044] The battery cell tab can be a separately configured conductive component that is electrically connected to the battery cell electrode sheet; the battery cell tab can also be formed by cutting a positive current collector or a negative current collector.

[0045] In an optional embodiment, the battery cell tabs include a positive tab and a negative tab. When the positive tab and the negative tab are located on the same side of the battery cell, 1000≤S≤2100, so that the electrical connection part of the battery current collector has a better welding effect.

[0046] The battery can be cylindrical or prism-shaped. For example, when the cell is cylindrical, 1100 ≤ S ≤ 1800. A cylindrical battery includes two oppositely arranged end faces and a peripheral side face. The positive and negative electrode tabs can be led out from one of the end faces. Due to the limited diameter of the cylindrical battery, the area that can be used for the positive and negative electrode tabs is limited. Therefore, the current collector of the cylindrical battery needs to have better welding performance to achieve overcurrent. In this application, by controlling S within the range of 1100-1800, the reflection phenomenon during welding is effectively reduced, thereby improving the welding effect.

[0047] Figure 7 This is a schematic diagram of the battery structure according to another embodiment of this application. Figure 8 This is a schematic diagram of the structure of an adapter piece according to an embodiment of this application, with reference to... Figure 7 and Figure 8When the battery is a prism-shaped battery, the current collector can be an adapter plate, which is welded to the cell tabs and terminals respectively. The cell tabs can be located at either the end along the height or the end along the length of the cell. When the cell tabs are located at the end along the length of the cell, the adapter plate includes a first connecting piece and a second connecting piece connected to the first connecting piece. The first and second connecting pieces form an included angle. The first connecting piece is welded to the cell tab, and the second connecting piece is welded to the terminal.

[0048] The battery current collector and battery in this application will be specifically described below through embodiments and comparative examples.

[0049] Examples 1-11

[0050] The color parameter of the surface of the electrical connection part of the battery current collector in Examples 1-11 that is welded to the cell tab satisfies S=L1. a1, 900≤S≤2500.

[0051] Comparative Examples 1-2

[0052] The color parameter S=L1 of the surface where the electrical connection of the current collector of the battery in Comparative Examples 1-2 is welded to the cell tab. a1 does not satisfy 900≤S≤2500.

[0053] The color parameters L1 and a1 of the surfaces of the electrical connection parts of the battery current collectors of Examples 1-11 and Comparative Examples 1-2 that are welded to the battery cell tabs were measured using a colorimeter. The tensile strength of the electrical connection portion of the battery current collectors in Examples 1-11 and Comparative Examples 1-2 was tested using a tensile testing machine.

[0054] The welding yield of the batteries in Examples 1-11 and Comparative Examples 1-2 was tested. The welding yield test method included the following steps: Weld 100 batteries and inspect each battery for welding failure; Welding yield = number of batteries without welding failure / 100; Among them, welding failure refers to at least one of the following situations: the surface of the electrical connection can be seen to be reflective under the laser oscilloscope, or there is a false weld when welding the battery current collector and the cell tab or electrode terminal.

[0055] For the welding yield, tensile strength test data of electrical connections, and specific values ​​of color parameters of the batteries in Examples 1-11 and Comparative Examples 1-2, please refer to Table 1 below.

[0056] Table 1

[0057] When the surface color parameter L1 of the electrical connection part of the battery current collector in Examples 1-4 meets the preferred range of 70≤L1≤85, a1 meets the preferred range of 14≤a1≤25, and S meets the preferred range of 1100≤S≤2000, the welding yield of the battery current collector is greater than or equal to 97.5%, and the tensile strength of the electrical connection part is greater than or equal to 169.6N. Therefore, the reflectivity of the electrical connection part of the battery that meets the above conditions is reduced, and the battery current collector maintains a high tensile strength, resulting in higher structural stability.

[0058] When the surface color parameter L1 of the electrical connection part of the battery current collector in Examples 5-6 meets the range 60≤L1≤90, but does not meet the preferred range 70≤L1≤85, and a1 meets the range 12≤a1≤32, but does not meet the preferred range 14≤a1≤25, and S meets the preferred range 1100≤S≤2000, the welding yield of the battery current collector is greater than or equal to 95.3%, and the tensile strength of the electrical connection part is greater than or equal to 165.7N. Compared with Examples 1-4, the welding yield and tensile strength of the battery current collector in Examples 5-6 are slightly lower.

[0059] When the surface color parameter L1 of the electrical connection part of the battery current collector in Examples 7-8 meets the preferred range of 70≤L1≤85, a1 meets the preferred range of 14≤a1≤25, and S meets the range of 900≤S≤2500 but does not meet the preferred range of 1100≤S≤2000, the welding yield of the battery current collector is greater than or equal to 92.8%, and the tensile strength of the electrical connection part is greater than or equal to 158.9N. Compared with Examples 1-4, the welding yield and tensile strength of the battery current collector in Examples 7-8 are slightly lower.

[0060] In Example 9, when the surface color parameter L1 of the electrical connection portion of the battery current collector meets the range 60≤L1≤90 but not the preferred range 70≤L1≤85, and a1 meets the preferred range 14≤a1≤25, and S meets the range 900≤S≤2500, the welding yield of the battery current collector in Example 9 is 91.30%, and the tensile strength of the electrical connection portion is greater than or equal to 154.3N. In Example 10, when the surface color parameter L1 of the electrical connection portion of the battery current collector meets the preferred range 70≤L1≤85, a1 does not meet the preferred range 14≤a1≤25, and S meets the preferred range 900≤S≤2500, the welding yield of the battery current collector in Example 10 is 90.40%, and the tensile strength of the electrical connection portion is greater than or equal to 168.5N. When the surface color parameter L1 of the electrical connection portion of the battery current collector in Example 11 does not meet the preferred range of 70≤L1≤85, a1 does not meet the preferred range of 14≤a1≤25, and S meets the preferred range of 900≤S≤2500, the welding yield of the battery current collector in Example 11 is 89.50%, and the tensile strength of the electrical connection portion is greater than or equal to 162.1N. Compared with Examples 1-8, the welding yield and tensile strength of the battery current collectors in Examples 9-11 are slightly lower.

[0061] The product S of the color parameters L1 and a1 on the surface of the electrical connection part of the battery current collector in Comparative Example 1 is 780, which does not satisfy 900≤S≤2500. As a result, the welding yield and tensile strength of the battery current collector in Comparative Example 1 are significantly reduced.

[0062] The product S of the color parameters L1 and a1 on the surface of the electrical connection part of the battery current collector in Comparative Example 2 is 2848, which does not satisfy 900≤S≤2500. The welding yield and tensile strength of the battery current collector in Comparative Example 2 are significantly reduced.

[0063] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations.

Claims

1. A battery current collector, characterized in that, The battery current collector is made of copper alloy and includes an electrical connection part for realizing the electrical connection between the cell tab and the electrode terminal. The color parameters of the surface of the electrical connection portion used for connecting with the battery cell tab and / or the electrode terminal include L1 and a1, where L1 is the value of the L channel in the Lab color space, and a1 is the value of the a channel in the Lab color space, wherein S=L1 a1, 1600≤S≤2000, 60≤L1≤90, 12≤a1≤32; The battery current collector includes a passivation region, at least one surface of the passivation region is provided with a passivation layer, and the passivation region forms the electrical connection portion; The ratio ρ of the thickness of the passivation layer to the thickness of the battery current collector ranges from 0.04 to 0.

6.

2. The battery current collector according to claim 1, characterized in that, 70≤L1≤85,14≤a1≤25。 3. The battery current collector according to claim 2, characterized in that, 75≤L1≤85,16≤a1≤22。 4. The battery current collector according to claim 3, characterized in that, 16≤a1≤20。 5. The battery current collector according to any one of claims 1-4, characterized in that, The battery current collector also includes a non-passivated region connected to the passivated region.

6. The battery current collector according to any one of claims 1-4, characterized in that, The ratio ρ of the thickness of the passivation layer to the thickness of the battery current collector ranges from 0.057 to 0.

6.

7. The battery current collector according to any one of claims 1-4, characterized in that, The thickness of the battery current collector is less than or equal to 0.4 mm.

8. The battery current collector according to any one of claims 1-4, characterized in that, The insulation resistance R of the electrical connection is 1.5-3.5 GΩ.

9. A battery, characterized in that, The device includes a housing, an end cap, a battery cell, and a battery current collector as described in any one of claims 1-8. The housing and the end cap enclose a cavity for accommodating the battery current collector and the battery cell. The battery cell includes a battery cell tab, and the housing includes an electrode terminal. The electrical connection portion is electrically connected to the battery cell tab and the electrode terminal, respectively.

10. The battery according to claim 9, characterized in that, The battery cell tabs include a positive tab and a negative tab, and the positive tab and the negative tab are located on the same side of the battery cell.

11. The battery according to claim 10, characterized in that, When the battery cell is a cylindrical cell, 1600≤S≤1800.

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