Cover plate, battery and electric equipment

Abstract

The utility model provides a cover plate, a battery and electric equipment. The cover plate comprises an electric conductor, the electric conductor comprises an electric conductor body and a plating layer, the plating layer is connected to at least part of the surface of the electric conductor body, and the electric conductivity of the plating layer is larger than that of the electric conductor body. According to the conductor, the plating layer is arranged on the surface of the conductor body, and the average conductivity of the conductor is improved by utilizing the high conductivity of the plating layer, so that the internal resistance of the conductor is reduced, and the internal resistance of a battery is reduced.

Description

Technical Field

[0001] This application relates to the field of battery structure technology, specifically to cover plates, batteries, and electrical devices. Background Technology

[0002] Lithium-ion batteries are widely used in energy storage systems, transportation, and consumer electronics. Lithium-ion batteries primarily discharge through a conductor; one end of the conductor is connected to the battery's tabs, while the other end is used to connect to external devices.

[0003] The internal resistance of batteries in related technologies still needs to be reduced. Utility Model Content

[0004] The embodiments of this application provide a cover plate, a battery, and an electrical device that can improve the technical problem that the internal resistance of the battery still needs to be reduced.

[0005] In a first aspect, embodiments of this application provide a cover plate applied to a battery, the cover plate including a conductor, the conductor comprising:

[0006] Conductor body;

[0007] A plating layer is attached to at least a portion of the surface of the conductive body, the conductivity of the plating layer being greater than the conductivity of the conductive body.

[0008] In one embodiment, the conductive body includes a first segment and a second segment connected in sequence, the cross-sectional area of ​​the first segment being smaller than that of the second segment, and the plating layer being disposed on the surface of the first segment.

[0009] In one embodiment, the plating layer is disposed at the bend of the conductive body.

[0010] In one embodiment, the conductor body includes pins, posts, and terminals connected in sequence, wherein,

[0011] At least a portion of the surface of the pin is provided with the plating layer, the conductivity of the plating layer being greater than the conductivity of the pin; and / or,

[0012] At least a portion of the surface of the electrode post is provided with the coating, the conductivity of the coating being greater than the conductivity of the electrode post; and / or,

[0013] The terminal has at least a portion of its surface covered with the plating layer, the conductivity of which is greater than that of the terminal.

[0014] In one embodiment, the pin has a connection portion that connects to the tab, and the material of the connection portion is the same as that of the tab.

[0015] In one embodiment, the area of ​​the portion of the conductive body connected to the plating layer is S5, and the area of ​​the conductive body is S6, wherein S5 / S6≥2%.

[0016] In one embodiment, the thickness of the coating is h2, where h2 ≥ 2 μm.

[0017] In one embodiment, the conductivity is the same at different locations of the conductor.

[0018] Secondly, embodiments of this application provide a battery including the aforementioned cover plate.

[0019] Thirdly, embodiments of this application provide an electrical device including the battery described above.

[0020] The beneficial effects of the embodiments of this application are as follows:

[0021] In the embodiments of this application, by providing a plating layer on at least a portion of the surface of the conductor body, the overall conductivity of the conductor can be increased because the conductivity of the plating layer is greater than that of the conductor body. This reduces the internal resistance of the conductor, thereby lowering the internal resistance of the battery containing the conductor. In other words, this application improves the average conductivity of the conductor by providing a plating layer on the surface of the conductor body, utilizing the high conductivity of the plating layer, thereby reducing the internal resistance of the conductor and ultimately lowering the internal resistance of the battery. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the conductor provided in an embodiment of this application;

[0024] Figure 2 This is a cross-sectional view of a conductor provided in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the pin structure provided in an embodiment of this application;

[0026] Figure 4 A cross-sectional view of pins provided for embodiments of this application;

[0027] Figure 5 A schematic diagram of the structure of the cover plate provided in an embodiment of this application;

[0028] Figure 6One of the partial structural cross-sectional views of the cover plate provided for an embodiment of this application;

[0029] Figure 7 A second partial structural cross-sectional view of the cover plate provided for an embodiment of this application;

[0030] Figure 8 A schematic diagram of the battery structure provided for an embodiment of this application. Detailed Implementation

[0031] 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 a part of the embodiments of this application, and not all of the 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. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0032] The following is combined with Figures 1 to 8 This application describes the cover plate, battery, and electrical device.

[0033] According to the embodiments of the first aspect of this application, such as Figure 1 and Figure 2 A cover plate is used in a battery. The cover plate includes a conductor, which includes a conductor body 6 and a plating layer 7. The plating layer 7 is connected to at least a portion of the surface of the conductor body 6, and the conductivity of the plating layer 7 is greater than the conductivity of the conductor body 6.

[0034] According to the embodiments of this application, by providing a plating layer 7 on at least a portion of the surface of the conductor body 6, the overall conductivity of the conductor can be increased because the conductivity of the plating layer 7 is greater than that of the conductor body 6. This reduces the internal resistance of the conductor, thereby lowering the internal resistance of the battery containing the conductor. In other words, this application improves the average conductivity of the conductor by providing a plating layer 7 on the surface of the conductor body 6, thereby reducing the internal resistance of the conductor and achieving a reduction in the internal resistance of the battery.

[0035] Understandably, batteries in related technologies primarily reduce their internal resistance by increasing the current-carrying area. However, given the limited internal space of the battery, it is difficult to effectively increase the current-carrying area of ​​the conductor, thus hindering the effective reduction of the battery's internal resistance. This application addresses this by providing a plating layer 7 on the conductor body 6 with a conductivity higher than that of the conductor body 6. This increases the conductivity of the conductor, reduces its internal resistance, and consequently lowers the battery's internal resistance. Furthermore, since the plating layer 7 occupies less space, it is less constrained by the internal space of the battery.

[0036] It should be noted that the conductor in this application can be used as a positive conductor or a negative conductor.

[0037] In some examples, the composition of coating 7 is, for example, a dissimilar metal of Al such as Ni, Cu, Sn, Au, Ag, Cr, etc.

[0038] In some examples, coating 7 has one or more layers;

[0039] In some examples, the coating 7 metal is a single metal or a combination of metals or a compound of metals.

[0040] In some embodiments, the conductive body 6 includes a first segment and a second segment connected in sequence, the cross-sectional area of ​​the first segment is smaller than that of the second segment, and the plating layer 7 is disposed on the surface of the first segment.

[0041] It is understandable that a plating layer 7 is provided at the first section with a smaller cross-sectional area of ​​the conductor body 6 to improve the conductivity at the section with a smaller cross-sectional area of ​​the conductor body 6. This helps to reduce the heat generation at the first section with a smaller cross-sectional area of ​​the conductor body 6, avoid local overheating of the conductor body 6, and reduce the overall internal resistance of the conductor, thereby reducing the internal resistance of the battery.

[0042] In some embodiments, the plating layer 7 is provided at the bend of the conductive body 6.

[0043] It is understandable that the bending points of the conductor body 6 generally have a small cross-sectional area or are difficult to dissipate heat. In this embodiment, a plating layer 7 is provided at the bending points of the conductor body 6, which helps to increase the conductivity at the bending points of the conductor body 6, thereby reducing the heat generation at the bending points of the conductor body 6, avoiding overheating at the bending points of the conductor body 6, and reducing the overall internal resistance of the conductor, thereby reducing the internal resistance of the battery.

[0044] In some embodiments, the conductor body 6 includes a pin 1, a pole 2, and a terminal 3 connected in sequence.

[0045] Specifically, at least a portion of the surface of pin 1 is provided with a plating layer 7, and the conductivity of the plating layer 7 is greater than that of pin 1.

[0046] It is understandable that by setting a plating layer 7 with a higher conductivity than pin 1 on the surface of pin 1, the conductivity of pin 1 can be improved, the overall conductivity of the conductor can be improved, and the internal resistance of the conductor can be reduced, thereby reducing the internal resistance of the battery. Moreover, since the plating layer 7 occupies less space, it is less restricted by the internal space of the battery.

[0047] Specifically, at least a portion of the surface of the electrode post 2 is provided with a coating 7, and the conductivity of the coating 7 is greater than the conductivity of the electrode post 2.

[0048] It is understandable that by setting a coating 7 with a higher conductivity than the electrode post 2 on the surface of the electrode post 2, the conductivity of the electrode post 2 can be improved, the overall conductivity of the conductor can be improved, and the internal resistance of the conductor can be reduced, thereby reducing the internal resistance of the battery. Moreover, since the coating 7 occupies less space, it is less restricted by the internal space of the battery.

[0049] Specifically, at least a portion of the surface of terminal 3 is provided with a plating layer 7, and the conductivity of the plating layer 7 is greater than that of terminal 3.

[0050] It is understandable that by setting a plating layer 7 with a higher conductivity than terminal 3 on the surface of terminal 3, the conductivity of terminal 3 is improved, the overall conductivity of the conductor is improved, and the internal resistance of the conductor is reduced, thereby reducing the internal resistance of the battery. Moreover, since the plating layer 7 occupies less space, it is less restricted by the internal space of the battery.

[0051] In some embodiments, pin 1 has a connection portion that connects to the tab, and the material of the connection portion is the same as that of the tab.

[0052] It is understandable that the connector of pin 1 is connected to the tab, and the material of the connector is the same as that of the tab, so the connector and the tab can be directly connected. For example, the connector and the tab can be directly connected by soldering, which improves the convenience of connecting pin 1 and the tab.

[0053] It is understandable that the connector of pin 1 is connected to the tab, and the material of the connector is the same as that of the tab. This avoids corrosion due to potential difference caused by the different materials of the connector and the tab, thus ensuring the connection stability between pin 1 and the tab.

[0054] In some embodiments, the area of ​​the portion of the conductive body 6 connected to the plating layer 7 is S5, and the area of ​​the conductive body 6 is S6, wherein S5 / S6≥2%.

[0055] It is understandable that if the ratio of the area of ​​the portion of the conductive body 6 with the plating layer 7 to the surface area of ​​the conductive body 6 is less than 2%, then the plating layer 7 is too small, making it difficult to effectively improve the conductivity of the conductor, and consequently, difficult to effectively reduce the internal resistance of the conductor. Therefore, this application sets the ratio of the area of ​​the portion of the conductive body 6 with the plating layer 7 to the surface area of ​​the conductive body 6 to be greater than or equal to 2%, ensuring that the plating layer 7 can effectively improve the conductivity of the conductor and reduce the internal resistance of the conductor.

[0056] In some embodiments, the thickness of the coating 7 is h2, wherein h2 ≥ 2 μm.

[0057] It is understandable that if the thickness of the coating 7 is less than 2 μm, the coating 7 will not effectively improve the conductivity of the conductor, and the coating 7 will be easily damaged. Therefore, this application sets the thickness of the coating 7 to be greater than or equal to 2 μm to ensure that the coating 7 can effectively improve the conductivity of the conductor and reduce the internal resistance of the conductor.

[0058] In some embodiments, the conductivity is the same at different locations of the conductor.

[0059] It is understandable that setting the conductivity at different locations of a conductor to be the same improves the conductivity uniformity of the conductor, thereby improving the internal resistance uniformity of the conductor, and also makes the heating of the conductor more uniform.

[0060] In some embodiments, such as Figure 1 , Figure 3 and Figure 4 Pin 1 includes:

[0061] Pin body 11, pin body 11 is made of aluminum;

[0062] A first separation layer 12 is disposed on at least a portion of the surface of the pin body 11, and the first separation layer 12 is used to separate the pin body 11 from the electrolyte.

[0063] It is understandable that using aluminum as the pin body 11 can effectively reduce the weight and cost of the pin body 11. Simultaneously, by providing a first separating layer 12 on at least a portion of the surface of the pin body 11 to prevent contact between the pin body 11 and the electrolyte, corrosion of the pin body 11 can be avoided, thus improving the stability of the pin body 11. In other words, by providing a first separating layer 12 on the surface of the aluminum pin body 11 to separate the electrolyte, this application can both reduce the weight and cost of the pin 1 and prevent the pin 1 from being exposed to radiation, ensuring the structural stability of the pin 1.

[0064] Understandably, in related technologies, aluminum readily intercalates into lithium ions at low potentials in lithium-ion batteries, forming a powdery alloy that is prone to corrosion. Therefore, aluminum is typically used as the positive electrode pin 1, and copper as the negative electrode pin 1. This results in a high weight and cost for the negative electrode pin 1, making it difficult to reduce the weight and cost of the battery. This application addresses this by replacing the material of the pin body 11 with aluminum and simultaneously providing a first separating layer 12 on the surface of the pin body 11 to prevent corrosion caused by contact between the pin body 11 and the electrolyte. This reduces the weight and cost of the pin 1 while maintaining its structural stability, thus contributing to a reduction in battery weight and cost.

[0065] In some embodiments, such as Figure 3 and Figure 4 The pin body 11 includes a first part 111, which is adapted to be immersed in an electrolyte, and the surface of the first part 111 is covered with a first separation layer 12.

[0066] Understandably, in a battery, the first part 111 of the pin body 11 is immersed in the electrolyte. In this embodiment, by providing a first separating layer 12 that fully covers the surface of the first part 111, the first part 111 of the pin body 11 can be completely separated from the electrolyte, preventing the first part 111 of the pin body 11 from contacting the electrolyte and causing corrosion. This reduces the weight and cost of the pin 1 while ensuring the structural stability of the pin 1.

[0067] In some examples, the pin body 11 may be completely or partially immersed in the electrolyte.

[0068] In some embodiments, such as Figure 3 and Figure 4 The pin body 11 also includes a second part 112 connected to the first part 111. The second part 112 is adapted to be spaced apart from the electrolyte. The area of ​​the portion of the second part 112 connected to the first separator layer 12 is S3, and the area of ​​the second part 112 is S4, wherein S3 / S4≥0.95.

[0069] Understandably, in the battery, the first part 111 of the lead body 11 is immersed in the electrolyte, while the second part 112 of the lead body 11 is above the electrolyte, meaning the second part 112 is not immersed in the electrolyte. Simultaneously, a first separating layer 12 is provided on the surface of the second part 112 to separate it from other substances, preventing contact and corrosion of the second part 112.

[0070] It is understandable that if the area of ​​the second part 112 with the first partition layer 12 is less than 95%, it will be difficult to provide separation and protection for the second part 112. The second part 112 is prone to corrosion due to contact with other substances, which will affect the structural stability of the pin 1. Therefore, this application designs the area of ​​the second part 112 with the first partition layer 12 to be greater than 95%, so that the first partition layer 12 can effectively provide separation and protection for the second part 112.

[0071] In some embodiments, the thickness of the first separator layer 12 is t, where t ≥ 2 μm.

[0072] It is understandable that if the thickness of the first separator layer 12 is less than 2 μm, the first separator layer 12 will be unable to effectively separate and protect the pin body 11, and the first separator layer 12 will be easily damaged. Therefore, this application sets the thickness of the first separator layer 12 to be greater than or equal to 2 μm, so that the first separator layer 12 can effectively separate and protect the pin body 11, and ensure the structural stability of the first separator layer 12, making the first separator layer 12 less prone to damage.

[0073] In some examples, the thickness of the first separator 12 refers to the radial thickness of the first separator 12 along the radial direction of the battery casing.

[0074] In some embodiments, the material of the first separator layer 12 is the same as the material of the tab.

[0075] It is understandable that the first separator layer 12 is disposed on the surface of the pin body 11, and therefore, when the pin 1 is connected to the tab, the first separator layer 12 may be in direct contact with the tab. In this embodiment, the material of the first separator layer 12 is designed to be the same as that of the tab, so that when the pin 1 is connected to the tab, the connection position of the pin 1 and the tab is made of the same material, which can avoid potential difference corrosion caused by different materials.

[0076] In some embodiments, the weight percentage of aluminum in pin 1 is greater than or equal to 70%.

[0077] It is understandable that if the aluminum content in pin 1 is less than 70%, it will be difficult to effectively reduce the weight and cost of pin 1. Therefore, this application sets the weight percentage of aluminum in pin 1 to be greater than or equal to 70% to ensure that the weight and cost of pin 1 can be effectively reduced.

[0078] In some embodiments, such as Figure 1 and Figure 3 The conductor also includes a post 2 and a terminal 3. The post 2 connects the pin 1 and the terminal 3. At least one of the posts 2 and the terminal 3 is made of aluminum.

[0079] It is understandable that pin 1, terminal 2 and terminal 3 are connected in sequence to form a conductor. Pin 1 is connected to the battery tabs, and terminal 3 is used to connect to external devices, thereby enabling the normal use of the battery.

[0080] Understandably, the use of aluminum as the material for pole 2 and / or terminal 3 can effectively reduce the weight and cost of the conductor.

[0081] In some embodiments, the conductor further includes a second separator layer disposed at the connection between the pole 2 and the pin 1.

[0082] Understandably, the second separator layer can separate the connection between the pole 2 and the pin 1 from other materials to prevent corrosion at the connection between the pole 2 and the pin 1.

[0083] In some examples, the connection between terminal 2 and pin 1 in the battery may be immersed in electrolyte. Therefore, a second separator layer is provided at the connection between terminal 2 and pin 1 to prevent corrosion caused by contact with electrolyte and to ensure the connection stability of terminal 2 and pin 1.

[0084] In some examples, the composition of the first separator 12 and the second separator is, for example, a dissimilar metal of Al such as Ni, Cu, Sn, Au, Ag, Cr, etc.

[0085] In some examples, the first partition layer 12 and the second partition layer are, for example, single-layer or multi-layer structures.

[0086] In some examples, the first separator 12 and the second separator are, for example, a metal or a combination of metals or a compound of metals.

[0087] Specifically, the first separator layer 12 and the second separator layer are made of the same material.

[0088] It is understandable that designing the first partition layer 12 and the second partition layer to be made of the same material allows the first partition layer 12 and the second partition layer to be set up in one go, making the operation simpler.

[0089] For example, the first separator layer 12 and the second separator layer are provided on the pin body 11 and the connection between the pin 1 and the pole post 2 by electroplating. Thus, the first separator layer 12 and the second separator layer are designed to be made of the same material, so that the first separator layer 12 and the second separator layer can be electroplated in one time without the need for two electroplatings.

[0090] In some embodiments, such as Figure 1 and Figure 6The conductor includes a pin 1, a pole 2, a terminal 3, and an anti-corrosion layer 5. The first end of the pole 2 is connected to the pin 1, and the terminal 3 is connected to the second end of the pole 2. At least one of the pin 1 and the terminal 3 is connected to the pole 2 with a weld 4, and the anti-corrosion layer 5 covers the weld 4.

[0091] It is understood that pin 1, terminal 2, and terminal 3 are connected sequentially. At least one of pin 1 and terminal 3 can be connected to terminal 2 by welding. That is, a weld 4 is formed at the connection between pin 1 and terminal 2 and / or at the connection between terminal 3 and terminal 2. By covering the weld 4 with the anti-corrosion layer 5, the anti-corrosion layer 5 can prevent the weld 4 from contacting other substances, thus protecting the weld 4 and preventing corrosion. This improves the corrosion resistance of the conductor, making it less prone to corrosion and enhancing the structural stability of the conductor.

[0092] Understandably, the anti-corrosion layer 5 separates the weld 4 from the external environment, making the weld 4 less prone to corrosion. The external environment can refer to either the internal space of the battery or the space outside the battery.

[0093] Understandably, in related technologies, during the welding process of connecting the electrode post 2 and the terminal 3, or welding the electrode post 2 and the pin 1, the welding process can easily cause the plating on the surface of the conductor to peel off, thereby exposing the substrate (e.g., copper) of the conductor. The exposed part is prone to corrosion, thus reducing the conductor's corrosion resistance. This application addresses this by providing an anti-corrosion layer 5 at the weld seam 4 of the conductor. The anti-corrosion layer 5 can cover the exposed part caused by welding and the weld seam 4, preventing other substances from contacting the weld seam 4 and the exposed part, thereby effectively preventing corrosion of the conductor, improving the conductor's corrosion resistance, and ensuring the structural stability of the conductor.

[0094] In some examples, the anti-corrosion layer 5 is deposited on the target area using processes such as local electroplating, chemical plating, PVD vacuum plating, and electrophoresis.

[0095] In some examples, the material of the anti-corrosion layer 5 includes, but is not limited to, elemental metals or alloys of zinc, nickel, chromium, silver, tin, gold, etc., which are different from copper and aluminum.

[0096] In some embodiments, terminal 3 is welded to pole 2.

[0097] Specifically, along the axial direction of the pole post 2, the orthographic projection of the weld seam 4 between the terminal 3 and the pole post 2 onto the pin 1 coincides with the orthographic projection of the anti-corrosion layer 5 onto the pin 1.

[0098] It is understandable that the orthographic projection of weld 4 on pin 1 coincides with the orthographic projection of anti-corrosion layer 5 on pin 1, which means that anti-corrosion layer 5 can completely cover the weld 4 between terminal 3 and pole post 2, effectively separating and protecting weld 4, preventing other substances from contacting weld 4, and thus effectively preventing corrosion of the conductor, improving the corrosion resistance of the conductor, and ensuring the structural stability of the conductor.

[0099] In some examples, the orthographic projection of the weld seam 4 between terminal 3 and pole post 2 on pin 1 coincides with the orthographic projection of the anti-corrosion layer 5 on pin 1. This is equivalent to the orthographic projection of the weld seam 4 between terminal 3 and pole post 2 on the inner bottom wall of the battery along the axial direction of the battery casing, coinciding with the orthographic projection of the anti-corrosion layer 5 on the inner bottom wall of the battery.

[0100] Specifically, along the axial direction of pole post 2, the weld seam 4 between terminal 3 and pole post 2, in the orthographic projection of pin 1, is located within the orthographic projection of anti-corrosion layer 5 on pin 1. (This is explained in conjunction with the inner bottom wall of the housing.)

[0101] It is understandable that if the orthogonal projection of weld 4 onto pin 1 is located within the orthogonal projection of anti-corrosion layer 5 onto pin 1, it means that anti-corrosion layer 5 can completely cover the weld 4 between terminal 3 and pole post 2, effectively separating and protecting weld 4, preventing other substances from contacting weld 4, and thus effectively preventing corrosion of the conductor, improving the corrosion resistance of the conductor, and ensuring the structural stability of the conductor.

[0102] In some examples, the weld seam 4 between terminal 3 and pole post 2 is projected onto pin 1 in the orthographic projection of the anti-corrosion layer 5 onto pin 1. This is equivalent to the weld seam 4 between terminal 3 and pole post 2 being projected onto the inner bottom wall of the battery along the axial direction of the battery casing in the orthographic projection of the anti-corrosion layer 5 onto the inner bottom wall of the battery.

[0103] In some embodiments, the anti-corrosion layer 5 is flush with the side of the terminal 3 opposite to the pin 1.

[0104] It is understandable that after the anti-corrosion layer 5 covers the weld seam 4 of the pole post 2 and the terminal 3, the anti-corrosion layer 5 is flush with the side of the terminal 3 away from the pin 1, that is, the anti-corrosion layer 5 will not protrude from the terminal 3, thereby ensuring the flatness of the conductor structure.

[0105] In some embodiments, such as Figure 6 and Figure 7 A first receiving groove 31 is formed on the side of terminal 3 away from pin 1, and a second receiving groove 21 connected to the first receiving groove 31 is formed on the side of pole 2 away from pin 1. The first receiving groove 31 and the second receiving groove 21 are used to receive the anti-corrosion layer 5.

[0106] It is understandable that the first receiving groove 31 and the second receiving groove 21 can accommodate the anti-corrosion layer 5, thereby facilitating the arrangement of the anti-corrosion layer 5. Furthermore, the first receiving groove 31 and the second receiving groove 21 can limit the anti-corrosion layer 5, enabling the anti-corrosion layer 5 to provide stable separation and protection for the weld 4, thus preventing corrosion of the weld 4.

[0107] In some examples, the weld 4 is located between the first receiving groove 31 and the second receiving groove 21 along the radial direction of the pole post 2.

[0108] In some embodiments, pin 1 is soldered to pole 2.

[0109] Specifically, along the axial direction of the pole post 2, the orthographic projection of the weld seam 4 between the pin 1 and the pole post 2 onto the terminal 3 coincides with the orthographic projection of the anti-corrosion layer 5 onto the terminal 3.

[0110] It is understandable that the orthographic projection of weld 4 on terminal 3 coincides with the orthographic projection of anti-corrosion layer 5 on terminal 3. This means that anti-corrosion layer 5 can completely cover the weld 4 between pin 1 and pole 2, effectively separating and protecting weld 4. This can prevent other substances from contacting weld 4, thereby effectively preventing corrosion of the conductor, improving the corrosion resistance of the conductor, and ensuring the structural stability of the conductor.

[0111] In some examples, the orthographic projection of the weld seam 4 between pin 1 and terminal 2 on terminal 3 coincides with the orthographic projection of the anti-corrosion layer 5 on terminal 3. This is equivalent to the orthographic projection of the weld seam 4 between pin 1 and terminal 2 on the inner bottom wall of the battery along the axial direction of the battery casing, which coincides with the orthographic projection of the anti-corrosion layer 5 on the inner bottom wall of the battery.

[0112] Specifically, along the axial direction of the pole post 2, the weld seam 4 between the pin 1 and the pole post 2 is located within the orthogonal projection of the anti-corrosion layer 5 onto the terminal 3.

[0113] It is understandable that if the orthogonal projection of weld 4 onto terminal 3 is located within the orthogonal projection of anti-corrosion layer 5 onto terminal 3, it means that anti-corrosion layer 5 can completely cover weld 4 between pin 1 and pole post 2, effectively separating and protecting weld 4, preventing other substances from contacting weld 4, and thus effectively preventing corrosion of the conductor, improving the corrosion resistance of the conductor, and ensuring the structural stability of the conductor.

[0114] In some examples, the orthographic projection of the weld seam 4 between pin 1 and terminal 2 onto terminal 3 is located within the orthographic projection of the anti-corrosion layer 5 onto terminal 3. This is equivalent to the orthographic projection of the weld seam 4 between pin 1 and terminal 2 onto the inner bottom wall of the battery along the axial direction of the battery casing being located within the orthographic projection of the anti-corrosion layer 5 onto the inner bottom wall of the battery.

[0115] In some embodiments, the anti-corrosion layer 5 extends in a direction away from the weld 4 along the radial direction of the pole post 2.

[0116] It is understandable that the anti-corrosion layer 5 covers the weld 4 and extends away from the weld 4, thereby increasing the coverage area of ​​the anti-corrosion layer 5. This allows the anti-corrosion layer 5 to cover at least a portion of the area around the weld 4, ensuring that the anti-corrosion layer 5 can effectively prevent corrosion of the conductor, improving the corrosion resistance of the conductor, and ensuring the structural stability of the conductor.

[0117] In some examples, the anti-corrosion layer 5 extends away from the weld 4, which can mean that the anti-corrosion layer 5 extends towards the center of the pole post 2, or it can mean that the anti-corrosion layer 5 extends away from the center of the pole post 2.

[0118] In some embodiments, the thickness of the anti-corrosion layer 5 along the axial direction of the pole post 2 is h1, wherein h1 ≥ 1.5 μm.

[0119] It is understandable that if the thickness of the anti-corrosion layer 5 is less than 1.5 μm, the anti-corrosion layer 5 will be difficult to effectively prevent corrosion of the conductor, and the anti-corrosion layer 5 will be easily damaged. Therefore, this application sets the thickness of the anti-corrosion layer 5 to be greater than or equal to 1.5 μm, so that the anti-corrosion layer 5 can play a stable anti-corrosion role for the conductor, improve the anti-corrosion ability of the conductor, and ensure the structural stability of the conductor.

[0120] In some embodiments, the anti-corrosion layer 5 covers at least a portion of the heat-affected zone of the weld 4.

[0121] Understandably, in addition to covering the weld 4, the anti-corrosion layer 5 also covers at least part of the heat-affected zone of the weld 4, increasing the coverage area of ​​the anti-corrosion layer 5. This ensures that the anti-corrosion layer 5 can effectively prevent corrosion of the conductor, improve the corrosion resistance of the conductor, and ensure the structural stability of the conductor.

[0122] It is understandable that the surface coating of the conductor in the heat-affected zone of weld 4 may also be affected by the welding and peel off. Therefore, this application provides an anti-corrosion layer 5 in at least part of the heat-affected zone to effectively ensure the anti-corrosion capability of the conductor.

[0123] In some examples, the width of the heat-affected zone along the radial direction of pole 2 is 3mm to 5mm, for example, 4mm. It should be noted that this is only an example of the width of the heat-affected zone, and the width of the heat-affected zone will vary due to factors such as the material of the conductor and the welding process.

[0124] Specifically, the heat-affected zone includes the covered area covered by the anti-corrosion layer 5, the area of ​​the covered area is S1, and the area of ​​the heat-affected zone is S2, wherein S1 / S2≥0.6.

[0125] Understandably, if the proportion of the heat-affected zone covered by the anti-corrosion layer 5 is less than 60%, the corrosion resistance of the conductor needs to be improved. Therefore, this application sets the proportion of the heat-affected zone covered by the anti-corrosion layer 5 to be greater than or equal to 60%, ensuring that the anti-corrosion layer 5 can effectively prevent corrosion of the conductor, improving the corrosion resistance of the conductor, and ensuring the structural stability of the conductor.

[0126] In some embodiments, the mass percentage of copper in weld 4 is a, wherein a ≥ 15%, which is beneficial to improving the conductivity and corrosion resistance of weld 4.

[0127] According to an embodiment of the second aspect of this application, such as Figure 8 The battery includes the aforementioned cover plate.

[0128] According to the battery embodiments of this application, by providing a plating layer 7 on at least a portion of the surface of the conductor body 6, the overall conductivity of the conductor can be increased because the conductivity of the plating layer 7 is greater than that of the conductor body 6, thereby reducing the internal resistance of the conductor and thus reducing the internal resistance of the battery. In other words, this application reduces the battery's internal resistance by providing a plating layer 7 on the surface of the conductor body 6, utilizing the high conductivity of the plating layer 7 to increase the average conductivity of the conductor, thereby reducing the internal resistance of the conductor.

[0129] In some embodiments, such as Figure 5 The cover plate includes a cover plate body 8, a first end of a conductor is connected to the cover plate body 8, and a second end of the conductor is connected to the battery tab.

[0130] According to an embodiment of the third aspect of this application, the electrical device includes the aforementioned pin 1.

[0131] According to the embodiments of this application, the electrical device provides a plating layer 7 on at least a portion of the surface of the conductor body 6. Since the conductivity of the plating layer 7 is greater than that of the conductor body 6, the overall conductivity of the conductor can be increased, thereby reducing the internal resistance of the conductor and thus reducing the internal resistance of the battery containing the conductor. In other words, this application improves the average conductivity of the conductor by providing a plating layer 7 on the surface of the conductor body 6, thereby reducing the internal resistance of the conductor and achieving a reduction in the internal resistance of the battery.

[0132] It should be noted that electrical equipment can be vehicles, energy storage power sources, consumer electronics, medical devices, smart cities, aircraft, or household appliances. It is important to note that the above are merely illustrative examples of electrical equipment and do not impose any specific limitations on the types of equipment used.

[0133] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A cover plate, used in a battery, characterized in that, Includes a conductor, the conductor comprising: Conductor body; A plating layer is attached to at least a portion of the surface of the conductive body, the conductivity of the plating layer being greater than the conductivity of the conductive body.

2. The cover plate according to claim 1, characterized in that, The conductive body includes a first segment and a second segment connected in sequence. The cross-sectional area of ​​the first segment is smaller than that of the second segment, and the plating layer is disposed on the surface of the first segment.

3. The cover plate according to claim 1, characterized in that, The coating is applied at the bends of the conductive body.

4. The cover plate according to any one of claims 1 to 3, characterized in that, The conductor body includes pins, terminals, and terminals connected in sequence, wherein... At least a portion of the surface of the pin is provided with the plating layer, the conductivity of the plating layer being greater than the conductivity of the pin; and / or, At least a portion of the surface of the electrode post is provided with the coating, the conductivity of the coating being greater than the conductivity of the electrode post; and / or, The terminal has at least a portion of its surface covered with the plating layer, the conductivity of which is greater than that of the terminal.

5. The cover plate according to claim 4, characterized in that, The pin has a connection portion that connects to the tab, and the material of the connection portion is the same as that of the tab.

6. The cover plate according to any one of claims 1 to 3, characterized in that, The area of ​​the portion of the conductive body connected to the plating layer is S5, and the area of ​​the conductive body is S6, wherein S5 / S6≥2%.

7. The cover plate according to any one of claims 1 to 3, characterized in that, The thickness of the coating is h2, where h2 ≥ 2 μm.

8. The cover plate according to any one of claims 1 to 3, characterized in that, The conductivity is the same at different locations of the conductor.

9. A battery, characterized in that, Includes the cover plate as described in any one of claims 1 to 8.

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

Images