Battery collector plate and battery

Abstract

The invention relates to the technical field of batteries, in particular to a battery collector plate and a battery. The battery collector plate comprises copper and an electric connection part, and the electric connection part is used for realizing electric connection between a battery cell tab and an electrode terminal; the color parameters of the surface, used for being connected with the battery cell tab and / or the electrode terminal, of the electric connection part comprise L1 and a1, L1 is the numerical value of an L channel in the Lab color space, a1 is the numerical value of an a channel in the Lab color space, S = L1 * a1, and 900 < = S < = 2500. By controlling the product S of L1 and a1 on the surface of the electric connection part to be within a proper range, light reflection can be reduced, the welding quality and stability are improved, and the structural strength of the battery collector plate is ensured.

Description

Technical Field

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

[0002] A battery, such as a cylindrical battery, includes a shell, an end cap, a battery cell and a collector plate. The end cap is fixedly connected to the open end of the shell to enclose a sealed cavity. The battery cell is located in the sealed cavity. The collector plate is provided at least at one end of the battery cell. The collector plate is used to connect the tab of the battery cell to the end cap or the shell. The connection between the collector plate and the tab is usually made by laser welding technology.

[0003] Among them, the preparation material of the collecting plate is generally metal, such as copper. Due to the high reflectivity of copper, part 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

[0004] The present application discloses a battery current collecting plate and a battery, which are used to solve the problem that the current collecting plate has a high reflectivity and leads to poor welding effect.

[0005] In order to achieve the above objectives, this application provides the following technical solutions: In a first aspect, the present application provides a battery collector tray, which includes copper and an electrical connection portion, which is used to achieve electrical connection between a battery cell tab and an electrode terminal; the color parameters of the surface of the electrical connection portion used to connect to the battery cell tab and / or the electrode terminal include L1 and a1, L1 is the value of the L channel in the Lab color space, a1 is the value of the a channel in the Lab color space, wherein S=L1×a1, 900≤S≤2500.

[0006] The battery collector provided by the present application has a larger L1, a higher glossiness of the surface of the electrical connection part, and a more severe reflection. In order to reduce L1, specific treatments can be performed, such as cleaning, passivation, or chemical corrosion of the surface of the electrical connection part, to reduce the glossiness of the surface of the electrical connection part, thereby reducing the reflection. However, L1 cannot be too small. When the electrical connection part is subjected to specific treatment, the structural strength and mechanical properties of the battery collector disk will deteriorate, resulting in an increased risk of fracture of the battery collector disk during welding. In addition, the color of the battery collector disk can also be adjusted to improve the degree of reflection on the surface of the electrical connection part. By comprehensively controlling the product S of L1 and a1 within a suitable range, the reflection can be reduced, the quality and stability of welding can be improved, and the structural strength of the battery collector disk can be ensured.

[0007] In a second aspect, the present application provides a battery, comprising a shell, an end cover, a battery cell and the battery collector plate of the first aspect, the shell and the end cover are arranged to form a chamber for accommodating the battery cell and the battery collector plate, the battery cell comprises a battery cell tab, the shell comprises an electrode terminal, and the electrical connection part is electrically connected to the battery cell tab and the electrode terminal, respectively.

[0008] The battery provided in the present application, wherein, when the battery collector disk and the battery cell tab or electrode terminal are welded, a specific treatment is performed, such as chemical corrosion of copper, so that the color parameter L1 of the surface of the electrical connection part becomes smaller, thereby reducing the glossiness of the electrical connection part of the battery collector disk, and further reducing the reflection phenomenon. However, L1 cannot be too small, which will cause the structural strength and mechanical properties of the battery collector disk to deteriorate. In addition, the color of the battery collector disk can also be controlled to improve the degree of reflection on the surface of the electrical connection part. By comprehensively controlling the product S of L1 and a1 within an appropriate range, the reflection is reduced, the quality and stability of welding are improved, and the structural strength of the battery collector disk is ensured, thereby improving the quality and stability of welding, and further improving the performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic structural diagram of a battery current collecting plate according to an embodiment of the present application; Figure 2 This is a schematic structural diagram of a battery current collecting plate according to another embodiment of the present application; Figure 3 A side view of a battery current collecting plate according to an embodiment of the present application; Figure 4 A side view of a battery current collecting plate according to another embodiment of the present application; Figure 5 This is a schematic structural diagram of a battery current collecting plate according to another embodiment of the present application; Figure 6 A schematic diagram of the structure of a battery according to an embodiment of the present application; Figure 7 A schematic diagram of the structure of a battery according to another embodiment of the present application; Figure 8 This is a schematic diagram of the structure of an adapter sheet according to an embodiment of the present application.

[0010] Reference numerals: 100 - battery current collector; 101 - positive electrode current collector; 102 - negative electrode current collector; 103 - insulating plate; 110 - passivation area; 111 - electrical connection portion; 120 - non-passivation area; 130 - first connecting piece; 140 - second connecting piece; 10-battery; 11-housing; 12-end cover. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0012] In order to facilitate understanding of the technical solution in the present application, the application scenario of the collecting plate is first explained.

[0013] The battery includes a cell, an end cap and a shell for encapsulating the cell. The end cap is snapped onto the opening of the shell to form a housing for encapsulating the cell. The cell includes a tab. A collector plate is provided at at least one end of the cell. The collector plate is used to connect the tab of the cell to the end cap or the shell. The connection between the collector plate and the tab is usually made by laser welding technology. The collector plate is generally made of metal, such as copper. Due to the high reflectivity of copper, part of the laser light source will be reflected during the laser welding process, resulting in the temperature and energy of the remaining light source not being concentrated, thereby affecting the welding effect.

[0014] In view of this, a battery current collecting plate is provided in an embodiment of the present application. Figure 1 This is a schematic diagram of the structure of a battery current collector according to an embodiment of the present application. Figure 2 This is a schematic structural diagram of a battery current collector according to another embodiment of the present application. Figure 3 This is a side view of a battery collector plate according to an embodiment of the present application. Figure 4 This is a side view of a battery collector plate according to another embodiment of the present application, referring to Figures 1 to 4 The battery collector plate includes copper, and the battery collector plate includes an electrical connection portion, which is used to achieve electrical connection between the battery 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, 900≤S≤2500.

[0015] Lab is a device-independent color model. The Lab color model consists of three elements (or channels): brightness L and color-related a and b. L represents brightness (Luminosity), and a represents the range from magenta to green. The value range of L is from 0 to 100. When L=50, it is equivalent to 50% black; the value range of a is from +127 to 128, where +127a is red, and gradually transitions to 128a to turn green. All colors are composed of these three values ​​that change alternately. The channels of the target Lab value are recorded as L1, a1, and b1.

[0016] It is understandable that when L1 is larger, the brightness and glossiness of the surface of the electrical connection part are higher, the reflected laser energy will increase, resulting in instability of the laser beam, affecting the continuity and stability of the welding process. In order to reduce L1, specific treatments can be performed, such as cleaning, passivation or chemical corrosion of the surface of the electrical connection part, to reduce the glossiness of the surface of the electrical connection part, thereby reducing reflection. However, excessive treatment may cause the structural strength and mechanical properties of the battery collector disk to deteriorate, resulting in an increased risk of fracture of the battery collector disk during welding; in addition, the color of the battery collector disk can also be adjusted, such as reducing the a1 value on the surface of the electrical connection part, that is, the color of the surface of the electrical connection part becomes darker, to improve the degree of reflection on the surface of the electrical connection part, and by comprehensively controlling the product S of L1 and a1 within an appropriate range, the reflection is reduced, the quality and stability of welding are improved, and the structural strength of the battery collector disk is ensured, reducing the impact on welding.

[0017] The electrode terminal is used to realize the electrical connection between the battery and the external circuit. Specifically, the electrode terminal can be a pole arranged on the battery housing, or the battery housing can also be directly used as the electrode terminal. The electrode terminal includes a positive terminal and a negative terminal.

[0018] The cell tabs include a positive tab and a negative tab. The positive tab and the negative tab may be located on the same side of the cell, or on both sides of the cell. When the positive tab and the negative tab may be located on the same side of the cell, the battery collector is located on the side of the cell close to the tab, and if 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 to electrically connect the positive electrode tab to the positive terminal, and the negative current collector is used to electrically connect the negative electrode tab to the negative terminal. The insulating plate is provided between the positive current collector and the negative current collector to isolate the positive current collector from the negative current collector.

[0019] It is understandable that the shape and size of the battery collector plate are set according to the type and size of the battery. Figure 1 As shown, the shape of the battery current collector plate can be circular, and the shapes of the positive electrode current collector plate, the negative electrode current collector plate and the insulating plate are all fan-shaped. The sizes of the three are designed according to actual needs.

[0020] In the optional solution of this embodiment, the material for preparing the battery current collecting disk includes copper, which means that the material for preparing the battery current collecting disk can be pure copper or a copper alloy.

[0021] In the optional solution of this embodiment, 1100≤S≤2000, when S is within the above range, the battery current collecting plate has better welding effect and structural strength.

[0022] Wherein, 60≤L1≤90, illustratively, L1 may 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 serious, and the welding effect is poor when the battery collector plate is electrically connected to the battery cell tab or electrode terminal; on the contrary, when L1 is too small, although the reflection phenomenon is alleviated, L1 is too small, and the structural strength of the battery collector plate may not be guaranteed.

[0023] Wherein, 12≤a1≤32, illustratively, a1 may be 12, 16, 18, 20, 22, 24, 26, 28, 32 or any other value between 14 and 32.

[0024] In the optional solution of this embodiment, 70≤L1≤85, 14≤a1≤25. When L1 and a1 meet the above conditions, the battery current collecting plate has a better welding effect and a higher structural strength.

[0025] Figure 5 This is a schematic diagram of the structure of a battery collector plate according to another embodiment of the present application, referring to Figure 5 The battery collector disk includes a passivation area, at least one surface of the passivation area is provided with a passivation layer, and the passivation area is the electrical connection part in this application. In this application, the ratio of the area of ​​the passivation area to the area of ​​the battery collector disk is not limited, and is set according to actual needs, as long as the area used for welding is provided with a passivation layer.

[0026] It should be noted that the preparation method of the passivation layer is not limited in the present application. Exemplarily, the passivation layer can be prepared by chemical etching or cleaning passivation. When the passivation layer is prepared by chemical etching, the following steps are specifically included: 1) Perform surface pretreatment on the battery collector to remove oil, oxides or other impurities on the surface of the battery collector to ensure the quality of the passivation layer.

[0027] 2) Passivation treatment, immersing the passivation area in a passivation solution, or forming a passivation layer on at least one surface of the passivation area by electrochemical means. Commonly used passivation solutions include but are not limited to chromates, nitrates, and phosphates.

[0028] 3) Cleaning and drying: Clean the battery collector tray with clean water to remove the passivation liquid residue on the surface of the battery collector tray. Then, dry the battery collector tray to prevent moisture residue.

[0029] The present application does not limit the adjustment method of L1 and a1. Specifically, L1 can be adjusted by the passivation time, and the value of a1 can be adjusted by the concentration of the passivation solution.

[0030] It is understandable that the passivation region may have only one surface provided with a passivation layer, for example, the surface of the passivation region connected to the battery cell tab is provided with a passivation layer, or the surface of the passivation region connected to the electrode terminal is provided with a passivation layer. Of course, the passivation region may also have two surfaces disposed opposite to each other provided with a passivation layer.

[0031] Among them, only one surface of the passivation area is provided with a passivation layer, which can improve the structural strength of the battery polar current disk and avoid corrosion on both sides of the battery collector disk. If the structural strength of the battery polar current disk is too low, the risk of damage such as breakage will increase.

[0032] In order to prevent the surface of the passivation area from being chemically corroded, resulting in the structural strength of the battery collector being too low, the ratio of the thickness of the passivation layer to the thickness of the battery collector is in the range of 0.04-0.6. The thickness of the passivation layer is measured using a scanning electron microscope or a film thickness meter.

[0033] It is understandable that when ρ is too large, the passivation layer is too thick, that is, the corrosion intensity of the battery collector disc surface is large, the structural strength of the battery collector disc is weak, the risk of the battery collector disc breaking increases, and the excessive thickness of the passivation layer will affect the overcurrent of the battery collector disc. On the contrary, when ρ is too small, the passivation layer is too thin, the corrosion degree of the battery collector disc surface is low, its glossiness is high, and the improvement of the reflection phenomenon is weak.

[0034] The battery collector disk may include only the passivation region, that is, the entire surface of the battery collector disk is covered with the passivation layer, or part of the surface of the battery collector disk may be covered with the passivation layer, such as Figure 5 As shown, the battery collector disk also includes a non-passivation area connected to the passivation area, that is, part of the surface of the battery collector disk is covered with an electrical connection portion, so as to avoid chemical corrosion on the entire surface of the battery collector disk, and only chemical corrosion is performed on the surface of the area used for electrical connection with the battery cell tab or electrode terminal, which can reduce the reflection phenomenon during laser welding and ensure that the battery collector disk as a whole has a high structural strength.

[0035] When the battery collector disk includes a non-passivation area, the ratio of the thickness of the passivation layer to the thickness of the battery collector disk is in the range of 0.057-0.6. The non-passivation area has a higher structural strength, thereby ensuring that the overall structural strength of the battery collector disk is higher. Therefore, the thickness of the passivation layer in the passivation area can be set thicker to improve the reflection phenomenon of the electrical connection part.

[0036] In the optional solution of this embodiment, the ratio r of the area of ​​the passivation area to the non-passivation area can be 0.1-0.9. When r is less than 0.1, the area of ​​the electrical connection part is too small, the welding area is insufficient, and the flow area is insufficient. On the contrary, when r is greater than 0.9, the area of ​​the electrical connection part is too large, the area of ​​the area where the battery collector plate is chemically corroded is too large, and the structural strength of the battery collector plate is deteriorated.

[0037] It is understandable that the shape of the passivation area is not limited in the present application, and the shape of the passivation area can be circular, square, or sector-shaped, etc., and is specifically set according to actual needs.

[0038] Among them, when the thickness of the battery collecting plate is less than or equal to 0.4 mm, 900≤S≤2000.

[0039] In an optional solution of this embodiment, the insulation resistance R of the electrical connection portion is 1.5-3.5 GΩ, and illustratively, R can be 1.5, 1.8, 2.0, 2.2, 2.4, 2.6, 2.8, 3.0, 3.5 or any other value between 1.5 and 3.5. The insulation resistance R of the electrical connection portion is measured by an internal resistance tester.

[0040] Based on the same technical concept, a battery is also provided in the embodiment of the present application. Figure 6 This is a schematic diagram of the structure of a battery according to an embodiment of the present application, referring to Figure 6 The battery includes a shell, an end cover, a battery cell and a battery collector plate in various possible embodiments of the present application, wherein the shell and the end cover are arranged to form a chamber for accommodating the battery cell and the battery collector plate, the battery cell includes a battery cell tab, the end cover includes an electrode terminal, and the electrical connection part is electrically connected to the battery cell tab and the electrode terminal respectively.

[0041] Because the battery collector plate included in the present application can reduce the reflection phenomenon during laser welding, improve the quality and stability of welding, the performance of the battery in the present application is also improved.

[0042] Among them, the battery cell includes a positive electrode sheet, a negative electrode sheet and a separator, the separator is arranged between the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet, the negative electrode sheet and the separator are wound or laminated to form a battery cell. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, and the negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. There is no special restriction on the positive electrode collector, as long as it is conductive and does not cause adverse chemical changes in the battery. Specifically, the preparation material of the positive electrode collector can be stainless steel, aluminum, nickel, titanium, fired carbon, or aluminum or stainless steel that has been surface-treated with at least one of carbon, nickel, titanium, silver, etc. The preparation material of the negative electrode collector is selected from copper, stainless steel, nickel, titanium, etc. In a specific embodiment, the positive electrode collector can be aluminum, and the negative electrode collector can be copper. The positive electrode active material layer includes positive electrode active materials, including nickel-cobalt-manganese ternary materials, lithium iron phosphate materials, lithium iron manganese phosphate materials, etc.; the negative electrode active material layer includes negative electrode active materials, including artificial graphite, natural graphite, silicon-based materials, etc. Therefore, the battery in this application includes but is not limited to lithium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, alkaline dry batteries, etc.

[0043] The cell tabs may be separately arranged conductive parts, which are electrically connected to the cell pole pieces; the cell tabs may also be formed by cutting the positive electrode current collector or the negative electrode current collector.

[0044] In an optional solution of this embodiment, the battery cell tabs include a positive electrode tab and a negative electrode tab. When the positive electrode tab and the negative electrode tab are located on the same side of the battery cell, 1000≤S≤2100, so that the electrical connection part of the battery collector plate has a better welding effect.

[0045] Among them, the battery can be a cylindrical battery or a quadrangular prism battery. Exemplarily, when the battery cell is a cylindrical battery cell, 1100≤S≤1800. The cylindrical battery includes two oppositely arranged end faces and a peripheral side surface. The positive pole ear and the negative pole ear can be led out from one of the end faces. Due to the limited diameter of the cylindrical battery, the area where the positive pole ear and the negative pole ear can be set is limited. Therefore, the battery collector of the cylindrical battery needs to have a better welding effect to achieve overcurrent. In this application, S is controlled within 1100-1800 to effectively reduce the reflection phenomenon during welding, thereby improving the welding effect.

[0046] Figure 7 This is a schematic diagram of the structure of a battery in another embodiment of the present application. Figure 8 This is a schematic diagram of the structure of an adapter sheet according to an embodiment of the present application, referring to Figure 7 and Figure 8 When the battery is a quadrangular prism battery, the battery collector plate can be an adapter plate, and the adapter plate is welded to the battery cell tab and the pole column respectively. The battery cell tab can be arranged at the end along the height direction of the battery cell, or at the end along the length direction of the battery cell. When the battery cell tab is arranged at the end along the length direction of the battery cell, the adapter plate includes a first connecting plate and a second connecting plate connected to the first connecting plate, the first connecting plate and the second connecting plate form an angle, the first connecting plate is welded to the battery cell tab, and the second connecting plate is welded to the pole column.

[0047] The battery collector plate and the battery in the present application are specifically described below through examples and comparative examples.

[0048] Embodiment 1-11

[0049] The color parameters of the surface of the electrical connection portion of the battery current collecting plate of Example 1-11, which is welded to the battery cell tab, satisfy S=L1×a1, 900≤S≤2500.

[0050] Comparative Example 1-2

[0051] The color parameter S=L1×a1 of the surface of the electrical connection portion of the battery current collecting plate of Comparative Example 1-2, which is welded to the battery cell tab, does not satisfy 900≤S≤2500.

[0052] The color parameters L1 and a1 of the surface of the electrical connection portion of the battery collector plate of Example 1-11 and Comparative Example 1-2 welded to the battery cell tab were measured using a colorimeter; The tensile strength test of the electrical connection parts of the battery current collecting plates of Examples 1-11 and Comparative Examples 1-2 was performed using a tensile testing machine.

[0053] The welding yield of the batteries of Examples 1-11 and Comparative Examples 1-2 was tested. The welding yield test method includes the following steps: Solder 100 batteries and test each battery for welding failure; Welding yield = number of batteries without welding failure / 100; Among them, welding failure refers to the existence of at least one of the following situations: the presence of reflection on the surface of the electrical connection portion can be visually seen under the laser galvanometer, or a cold weld occurs when welding the battery collector and the battery cell tab or electrode terminal.

[0054] Please refer to Table 1 below for the welding yield rate of the batteries of Examples 1-11 and Comparative Examples 1-2, the test data of the tensile strength of the electrical connection portion, and the specific values ​​of the color parameters.

[0055] Table 1

[0056] When the color parameter L1 of the surface of the electrical connection part of the battery collector disk of Examples 1-4 satisfies the preferred range of 70≤L1≤85, a1 satisfies the preferred range of 14≤a1≤25, and S satisfies the preferred range of 1100≤S≤2000, the welding yield of the battery collector disk 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 reflection phenomenon of the electrical connection part of the battery that meets the above conditions is weakened, and the battery collector disk maintains a high tensile strength and has higher structural stability.

[0057] When the color parameter L1 of the surface of the electrical connection part of the battery collector disk of Examples 5-6 satisfies the range of 60≤L1≤90, but does not satisfy the preferred range of 70≤L1≤85, a1 satisfies the range of 12≤a1≤32, but does not satisfy the preferred range of 14≤a1≤25, and S satisfies the preferred range of 1100≤S≤2000, the welding yield of the battery collector disk 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 collector disk of Examples 5-6 are slightly reduced.

[0058] When the color parameter L1 of the surface of the electrical connection part of the battery collector disk of Examples 7-8 satisfies the preferred range of 70≤L1≤85, a1 satisfies the preferred range of 14≤a1≤25, and S satisfies the range of 900≤S≤2500, but does not satisfy the preferred range of 1100≤S≤2000, the welding yield of the battery collector disk 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 collector disk of Examples 7-8 are slightly reduced.

[0059] When the color parameter L1 of the surface of the electrical connection portion of the battery collector disk of Example 9 satisfies the range of 60≤L1≤90, does not satisfy the preferred range of 70≤L1≤85, a1 satisfies the preferred range of 14≤a1≤25, and S satisfies the range of 900≤S≤2500, the welding yield of the battery collector disk of Example 9 is equal to 91.30%, and the tensile strength of the electrical connection portion is greater than or equal to 154.3 N. When the color parameter L1 of the surface of the electrical connection portion of the battery collector disk of Example 10 satisfies the preferred range of 70≤L1≤85, a1 does not satisfy the preferred range of 14≤a1≤25, and S satisfies the preferred range of 900≤S≤2500, the welding yield of the battery collector disk of Example 10 is equal to 90.40%, and the tensile strength of the electrical connection portion is greater than or equal to 168.5 N. When the color parameter L1 of the surface of the electrical connection portion of the battery collector disk of Example 11 does not satisfy the preferred range of 70≤L1≤85, a1 does not satisfy the preferred range of 14≤a1≤25, and S satisfies the preferred range of 900≤S≤2500, the welding yield of the battery collector disk of Example 11 is equal to 89.50%, and the tensile strength of the electrical connection portion is greater than or equal to 162.1 N. Compared with Examples 1-8, the welding yield and tensile strength of the battery collector disks of Examples 9-11 are slightly reduced.

[0060] The product S of the color parameters L1 and a1 of the surface of the electrical connection portion of the battery collector disk of Comparative Example 1 is 780, which does not satisfy 900≤S≤2500. The welding yield and tensile strength of the battery collector disk of Comparative Example 1 are significantly reduced.

[0061] The product S of the color parameters L1 and a1 of the surface of the electrical connection portion of the battery collector disk of Comparative Example 2 is 2848, which does not satisfy 900≤S≤2500. The welding yield and tensile strength of the battery collector disk of Comparative Example 2 are significantly reduced.

[0062] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A battery collector plate, characterized in that: The battery collector plate comprises copper, and the battery collector plate comprises an electrical connection portion, and the electrical connection portion is used to realize electrical connection between the battery cell tab and the electrode terminal; The color parameters of the surface of the electrical connection portion 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, 900≤S≤2500.

2. The battery collector according to claim 1, characterized in that: 1100≤S≤2000。 3. The battery collector plate according to claim 1, characterized in that: 60≤L1≤90,12≤a1≤32.

4. The battery collector plate according to claim 3, characterized in that: 70≤L1≤85,14≤a1≤25.

5. The battery current collector according to any one of claims 1 to 4, characterized in that: The battery current collecting disk comprises 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.

6. The battery current collecting plate according to claim 5, characterized in that: The ratio ρ of the thickness of the passivation layer to the thickness of the battery current collecting disk is in the range of 0.04-0.

6.

7. The battery current collecting plate according to claim 5, characterized in that: The battery current collecting disk further includes a non-passivation area connected to the passivation area.

8. The battery current collecting plate according to claim 7, characterized in that: The ratio ρ of the thickness of the passivation layer to the thickness of the battery current collecting disk is in the range of 0.057-0.

6.

9. The battery current collector according to claim 1, characterized in that: When the thickness of the battery current collecting plate is less than or equal to 0.4 mm, 900≤S≤2000.

10. The battery current collecting plate according to claim 5, characterized in that: The insulation resistance R of the electrical connection portion is 1.5-3.5 GΩ.

11. A battery, characterized in that: It comprises a shell, an end cover, a battery cell and a battery collector plate as described in any one of claims 1 to 10, the shell and the end cover are arranged to form a chamber for accommodating the battery collector plate and the battery cell, the battery cell comprises a battery cell tab, the shell comprises an electrode terminal, and the electrical connection part is electrically connected to the battery cell tab and the electrode terminal respectively.

12. The battery according to claim 11, characterized in that The battery cell tabs include a positive electrode tab and a negative electrode tab. When the positive electrode tab and the negative electrode tab are located on the same side of the battery cell, 1000≤S≤2100.

13. The battery according to claim 12, characterized in that When the battery cell is a cylindrical battery cell, 1100≤S≤1800.

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