Cover plate assembly, battery and electrical device

Abstract

The present application relates to the technical field of batteries, and provides a cover plate assembly, a battery, and an electrical device. The cover plate assembly comprises a cover plate and an electrode terminal. A mounting hole is provided in the center of the cover plate, the cover plate comprising a first insulating member. The electrode terminal comprises a terminal piece and a second insulating member, the second insulating member being arranged on a side of the terminal piece. The terminal piece at least partially passes through the mounting hole and is connected to the cover plate. The second insulating member is in surface contact with the first insulating member. The cover plate assembly provided in examples of the present application can reduce the possibility of mutual interference of different parts of a battery cover plate during assembly, and improve the assembly efficiency and assembly reliability of the battery cover plate.

Description

Cover plate assembly, battery and electrical equipment

[0001] This application claims priority to Chinese Patent Application No. 2024212042502, filed with the State Intellectual Property Office of China on May 29, 2024, entitled “Cover Assembly, Battery and Electrical Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a cover plate assembly, a battery, and an electrical device. Background Technology

[0003] A battery is a device that converts chemical energy into electrical energy, providing power to numerous electrical appliances and enabling them to operate. Existing batteries are widely used in power applications such as automobiles, construction machinery, and ships, and can also be used for home energy storage, industrial and commercial energy storage, and communication base stations.

[0004] A battery typically consists of a cover assembly and a casing. Based on the existing cover assembly structure, interference can occur between different components during the connection of battery cover assemblies, thus affecting the assembly efficiency and reliability of the battery cover.

[0005] Utility Model Content

[0006] This application provides a cover plate assembly, a battery, and an electrical device, which reduces the possibility of mutual interference between different components of the battery cover plate during assembly and improves the assembly efficiency and reliability of the battery cover plate.

[0007] In a first aspect, this application provides a cover plate assembly, which includes a cover plate and electrode terminals. The cover plate has a mounting hole in the middle and includes a first insulating member; the electrode terminal includes a terminal piece and a second insulating member, the second insulating member is disposed on one side of the terminal piece, the terminal piece at least partially passes through the mounting hole and is connected to the cover plate, and the second insulating member is in surface contact with the first insulating member.

[0008] In this example, because the cover plate and electrode terminals are separate components, the electrode terminals can be connected to other structures first, followed by the connection between the cover plate and the electrode terminals. This reduces the impact of the cover plate on the fit between the electrode terminals and other structures, improving the assembly quality and efficiency of the cover plate assembly.

[0009] During the assembly or use of the cover plate assembly, the first insulating component and the second insulating component work together to buffer the pressure between different components within the cover plate assembly, reduce the amplitude of vibration between different components, and thus reduce the possibility of damage to the internal structure of the battery due to pressure and vibration.

[0010] In some possible implementations, the contact surfaces between the first insulating member and the second insulating member include a guide surface and a stop surface, the stop surface being substantially parallel to the terminal piece, one end of the guide surface being connected to the stop surface, and the other end of the guide surface being farther away from the terminal piece than the stop surface.

[0011] By providing a guide surface, when assembling the second insulating component with the first insulating component, the second insulating component can first enter the end with the larger diameter of the first mounting hole, thus improving the assembly efficiency of the second and first insulating components. By providing a stop surface, the position of the second insulating component relative to the first insulating component can be restricted. Since the first insulating component is part of the cover plate and the second insulating component is part of the electrode terminal, the stop surface can restrict the position of the electrode terminal relative to the cover plate.

[0012] In some possible implementations, the cover plate also includes a cover sheet connected to the first insulating element.

[0013] In some possible implementations, the electrode terminal further includes a third insulating element, a sealing element, and a terminal post. The third insulating element is located on the side of the terminal piece opposite to the second insulating element. The sealing element is located on the side of the second insulating element opposite to the terminal piece. The terminal post connects the third insulating element, the terminal piece, the second insulating element, and the sealing element. When the electrode terminal is connected to a cover plate, the terminal piece contacts the surface of the cover plate.

[0014] In some possible implementations, the connection point between the first insulating member and the second insulating member is the first connection point, and the connection point between the terminal piece and the cover plate is the second connection point, with the first connection point and the second connection point being at least partially staggered.

[0015] The staggered arrangement of the first and second connections can extend the path of electrolyte leakage from the inside and outside of the casing, thereby reducing the possibility of electrolyte leakage from the casing.

[0016] In some possible implementations, the mounting holes on the cover plate include a first split hole and a second split hole that are interconnected. The first split hole is located on the side of the cover plate away from the first insulator, and the second split hole is located on the side of the cover plate facing the first insulator. The diameter of the first split hole is larger than the diameter of the second split hole.

[0017] The terminal piece includes a first part and a second part connected to each other. The first part is closer to the second insulating member than the second part. The diameter of the first part is larger than the diameter of the second part. The first part mates with the first hole, and the second part mates with the second part.

[0018] When the diameter of the first split hole is larger than the diameter of the second split hole, during the process of the terminal piece and the cover plate mate, the second part can enter the first split hole first. That is, the end with the smallest size of the terminal piece enters the part with the largest size of the second part mounting hole first, which can improve the assembly efficiency of the terminal piece and the cover plate.

[0019] Furthermore, since the diameter of the first dividing hole is larger than the diameter of the second dividing hole, a first mating surface can be formed at the transition between the first and second dividing holes. Similarly, since the diameter of the first split piece is larger than the diameter of the second split piece, a second mating surface can be formed at the transition between the first and second split pieces. During the mating process of the terminal piece and the cover plate, the first and second mating surfaces contact each other to restrict the relative positions of the terminal piece and the cover plate. This allows the side of the cover plate facing away from the first insulating member to be flush with the side of the terminal piece facing away from the second insulating member, facilitating the connection of the cover plate and the terminal piece by butt welding, thus forming a single unit between the cover plate and the electrode terminal.

[0020] In some possible implementations, the cover plate has a connecting groove on the side facing the second insulator, and the second insulator has a connecting protrusion on the side facing the cover plate, the connecting protrusion being able to extend into the connecting groove and connect with the connecting protrusion.

[0021] Since the connecting protrusion is located on the first insulating member and the connecting groove is located on the cover plate, the cooperation between the connecting protrusion and the connecting groove can realize the connection between the first insulating member and the cover plate, ensuring the reliability of the connection between the first insulating member and the cover plate.

[0022] In some possible implementations, the cover assembly also includes a current collector located on the side of the pole near the first insulator.

[0023] A second aspect of this application provides a battery comprising a cell, a housing, and a cover assembly provided in any of the above examples. The housing has a receiving cavity, the cell is disposed within the receiving cavity, and the cover assembly is disposed on one side of the cell and closes the opening of the receiving cavity.

[0024] The beneficial effects of the battery provided in the second aspect and the various possible designs of the second aspect can be found in the first aspect and the various possible implementations of the first aspect, and will not be repeated here.

[0025] A third aspect of this application provides an electrical device that includes the battery mentioned in the above examples.

[0026] The beneficial effects of the electrical equipment provided in the third aspect and the various possible designs of the third aspect can be seen in the beneficial effects of the second aspect and the various possible implementations of the second aspect, and will not be repeated here. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the structure of a battery provided in this application example.

[0028] Figure 2 is an exploded structural diagram of a cover plate assembly provided in this application example.

[0029] Figure 3 is a schematic diagram of the exploded structure of an electrode terminal provided in this application example.

[0030] Figure 4 is a schematic diagram of the exploded structure of a cover plate provided in this application example.

[0031] Figure 5 is a schematic diagram of the structure of a cover plate provided in this application example.

[0032] Figure 6 is a schematic diagram of the internal structure of a cover plate assembly provided in this application example.

[0033] Figure 7 is a schematic diagram of the structure of a manifold provided in this application example.

[0034] Explanation of reference numerals in the attached drawings: 100, cover plate assembly; 110, cover plate; 111, cover plate piece; 1111, connecting groove; 112, first insulating element; 1121, connecting protrusion; 120, electrode terminal; 121, third insulating element; 122, terminal piece; 123, second insulating element; 124, sealing element; 125, pole post; 130, collector plate; 131, through hole; 132, positioning groove; 200, housing. Detailed Implementation

[0035] To make the purpose, technical solutions, and advantages of the examples in this application clearer, the technical solutions in the examples of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described examples are only a part of the examples in this application, not all of them. Based on the examples in this application, all other examples obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terms used herein in the description of the application are for the purpose of describing particular examples only and are not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the description, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0037] In this document, the term "example" means that a particular feature, structure, or characteristic described in connection with the example can be included in at least one example of this application. The appearance of the phrase "example" in various places in the specification does not necessarily refer to the same example, nor is it a separate or alternative example mutually exclusive with other examples. It will be explicitly and implicitly understood by those skilled in the art that the examples described herein can be combined with other examples.

[0038] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0039] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the socket in this application.

[0040] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

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

[0042] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by a partition, such as a connection fixed by screws, bolts, or other partitions; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] A battery is a device that provides electrical energy to an electrical appliance, enabling the appliance to operate. Batteries generally consist of a cover and a casing.

[0044] The existing cover plate structure consists of a pole and a cover plate, which are connected together by through welding to form a single structure. This results in a low overall welding yield for the cover plate structure. To improve the welding yield of the cover plate structure, the requirements for the welding surface will be increased, thereby increasing the processing cost of the cover plate structure.

[0045] Based on the above, this application provides a cover plate assembly, a battery, and an electrical device.

[0046] To enable those skilled in the art to better understand the present application, the cover plate assembly and battery provided in the example of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0047] For example, this application provides an electrical device that includes a battery.

[0048] Electrical equipment uses batteries as its power source. This electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc.

[0049] Next, we will give a brief introduction to the batteries mentioned in the example above.

[0050] For example, Figure 1 is a schematic diagram of the structure of a battery provided in this application. Referring to Figure 1, the battery may include a housing 200, a cover assembly 100, and one or more battery cells. The housing 200 has a receiving cavity, the battery cells are disposed in the receiving cavity, and the cover assembly 100 is disposed on one side of the battery cells and closes the opening of the receiving cavity.

[0051] The casing 200 can adopt various structures. For example, the casing 200 can be cylindrical, cuboid, or other cubic. This application example only describes a cylindrical battery.

[0052] Each cell can be a secondary battery or a primary battery. It can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these.

[0053] Next, the specific structure of the cover plate assembly 100 will be described in detail.

[0054] For example, Figure 2 is an exploded view of a cover plate assembly provided in this application, and Figure 3 is an exploded view of an electrode terminal provided in this application. Please refer to Figures 2 and 3. This application provides a cover plate assembly 100, which may include a cover plate 110 and an electrode terminal 120. The cover plate 110 has a mounting hole in the middle and includes a first insulating member 112. The electrode terminal 120 includes a terminal piece 122 and a second insulating member 123. The second insulating member 123 is disposed on one side of the terminal piece 122. The terminal piece 122 at least partially passes through the mounting hole and is connected to the cover plate 110. The second insulating member 123 is in surface contact with the first insulating member 112.

[0055] The mounting hole configuration can vary depending on the arrangement of the electrode terminal 120. For example, the mounting hole can be a circular hole, an elliptical hole, a rectangular hole, or a hole of other shapes. The mounting hole can be located at the geometric center of the cover plate 110, or it can be located off-center from the geometric center of the cover plate 110. The position of the mounting hole can also vary depending on the position of the terminal block. This application example does not limit the specific configuration of the mounting hole, as long as the electrode terminal 120 can pass through the mounting hole and can mate with the cover plate 110 through the mounting hole.

[0056] Electrode terminals 120 are directly or indirectly connected to the winding core in the battery cell, thereby outputting the electrical energy converted in the battery cell to the outside of the battery. For details on the connection method between the limiting terminals and the winding core, please refer to the relevant description below.

[0057] Both the first insulating element 112 and the second insulating element can be made of insulating materials, such as silicone rubber, nitrile rubber, ethylene propylene rubber, or other insulating materials. The material used to manufacture the first insulating element 112 can be the same as or different from the material used to manufacture the second insulating element 123; this application example does not impose specific limitations in this regard.

[0058] Terminal piece 122 can be made of metal. Terminal piece 122 cooperates with second insulating member 123 to seal the opening of the receiving cavity in housing 200. Compared with terminal piece 122, second insulating member 123 is closer to housing 200. Therefore, second insulating member 123 can seal the opening of receiving cavity and reduce the possibility of electrolyte leakage from housing 200.

[0059] When the electrode terminal 120 is connected to the cover plate 110, the first insulating member 112 and the second insulating member 123 are in surface contact. The contact surface between the first insulating member 112 and the second insulating member 123 can be a plane, multiple connected planes, or a curved surface. This application example does not impose specific limitations on the contact surface between the first insulating member 112 and the second insulating member 123.

[0060] The first insulating member 112 and the second insulating member 123 can be formed separately, or the first insulating member 112 and the second insulating member 123 can be formed after the first insulating member is split. The example of this application does not limit the specific forming method of the first insulating member 112 and the second insulating member 123.

[0061] The engagement between the cover plate 110 and the electrode terminal 120 can be performed inside the housing 200 or outside the housing 200.

[0062] The engagement of the cover plate 110 with the electrode terminal 120 can be performed after the electrode terminal 120 is engaged with other structural components. The present application example does not impose specific limitations on this.

[0063] The cooperation between the first insulating member 112 and the second insulating member 123 can limit the position of the cover plate 110 relative to the cover plate 110 to a certain extent, which facilitates the cooperation between the cover plate 110 and the electrode terminal 120.

[0064] The cover plate 110 and the electrode terminal 120 can be welded together, riveted together, or connected together by bolts or other fasteners.

[0065] In summary, in this example, since the cover plate 110 and the electrode terminal 120 are separately configured, the connection between the electrode terminal 120 and other structures can be performed first, followed by the connection between the cover plate 110 and the electrode terminal 120. Based on this, the impact of the cover plate 110 on the fit between the electrode terminal 120 and other structures can be reduced, improving the assembly quality and efficiency of the cover plate assembly.

[0066] During the assembly or use of the cover plate assembly, the first insulating member 112 and the second insulating member 123 work together to buffer the pressure between different components inside the cover plate assembly, reduce the amplitude of vibration between different components, and thus reduce the possibility of damage to the internal structure of the battery due to pressure and vibration.

[0067] Based on the cover plate assembly 100 provided in the above example, the contact surfaces of the first insulating member 112 and the second insulating member 123 include a guide surface and a stop surface. The stop surface is substantially parallel to the terminal piece 122. One end of the guide surface is connected to the stop surface, and the other end of the guide surface is farther away from the terminal piece 122 than the stop surface.

[0068] The stop surface is basically parallel to the terminal piece 122, and the angle between the stop surface and the terminal piece 122 is less than 5 degrees or equal to 5 degrees.

[0069] Since the stop surface is basically parallel to the terminal piece 122, one end of the guide surface is connected to the stop surface, and the other end of the guide surface is farther away from the terminal piece 122 than the stop surface, therefore, an angle can be provided between the guide surface and the stop surface, and the angle can be a right angle or an obtuse angle.

[0070] Since the mounting hole penetrates the cover plate 110 and the first insulating member 112 is part of the cover plate 110, a portion of the mounting hole is located in the first insulating member 112, and this portion of the mounting hole can be the first portion of the mounting hole. The second insulating member 123 passes through the first portion of the mounting hole in the first insulating member 112 and mates with the first insulating member 112.

[0071] When the included angle between the guide surface and the stop surface is an obtuse angle, when the second insulating component 123 is assembled with the first insulating component 112, the second insulating component 123 can enter the end with the larger diameter of the first part of the mounting hole first, which can improve the assembly efficiency of the second insulating component 123 and the first insulating component 112.

[0072] When the second insulating member 123 is assembled with the first insulating member 112, the second insulating member 123 first contacts the guide surface on the first insulating member 112, and finally contacts the stop surface on the first insulating member 112. The stop surface can limit the position of the second insulating member 123 relative to the first insulating member 112. Since the first insulating member 112 is part of the cover plate 110 and the second insulating member 123 is part of the electrode terminal 120, the stop surface can limit the position of the electrode terminal 120 relative to the cover plate 110.

[0073] In summary, by providing a guide surface, when assembling the second insulating member 123 with the first insulating member 112, the second insulating member 123 can first enter the end with the larger diameter of the first mounting hole, thus improving the assembly efficiency of the second insulating member 123 and the first insulating member 112. By providing a stop surface, the position of the second insulating member 123 relative to the first insulating member 112 can be restricted. Since the first insulating member 112 is part of the cover plate 110 and the second insulating member 123 is part of the electrode terminal 120, the stop surface can restrict the position of the electrode terminal 120 relative to the cover plate 110.

[0074] Based on the cover plate assembly 100 provided in the above example, Figure 4 is an exploded structural schematic diagram of a cover plate 110 provided in this application example. Referring to Figure 4, the cover plate 110 may also include a cover plate piece 111, which is connected to the first insulating member 112.

[0075] The cover plate 111 may be made of a conductive material, such as aluminum and its alloys or other conductive materials. This application example does not limit the specific manufacturing material of the cover plate 111.

[0076] The cover plate 111 can be welded to the first insulating member 112, or it can be bonded to the first insulating member 112. Alternatively, the cover plate 111 can be connected to the first insulating member 112 via riveting, threaded connections, or other connecting components. This application example does not specifically limit the connection method between the cover plate 111 and the first insulating member 112. This application example only describes the welding of the cover plate 111 to the first insulating member 112 as an example.

[0077] The first insulating element 112 can be disposed between the cover plate 111 and the housing 200. Based on this, the first insulating element 112 can improve the sealing performance of the battery, reduce the possibility of external liquids, dust, etc. entering the battery and its interior, and also reduce the possibility of electrolyte leakage, thus ensuring the reliability of the battery.

[0078] In addition, based on the insulation performance of the first insulator 112, the first insulator 112 can also reduce the possibility of a short circuit between the positive and negative terminals of the battery.

[0079] Based on the cover plate assembly 100 provided in the above example, Figure 5 is a structural schematic diagram of a cover plate provided in this application example. Referring to Figures 4 and 5, a connecting protrusion 1121 may be provided on the side of the first insulating member 112 facing the cover plate 111, and a connecting groove 1111 may be provided on the side of the cover plate 111 facing the first insulating member 112, and the connecting protrusion 1121 can extend into the connecting groove 1111.

[0080] There can be one, two, three, four or even more connecting protrusions 1121.

[0081] The connecting protrusion 1121 and the connecting groove 1111 can be connected together by ultrasonic welding. Based on this, during the ultrasonic welding process of the connecting protrusion 1121 and the connecting groove 1111, the connecting protrusion 1121 can melt during the ultrasonic welding process, and then be connected to the connecting groove 1111 under the action of ultrasonic welding.

[0082] Since the connecting protrusion 1121 is provided on the first insulating member 112 and the connecting groove 1111 is provided on the cover plate 111, the cooperation between the connecting protrusion 1121 and the connecting groove 1111 can realize the connection between the first insulating member 112 and the cover plate 111, ensuring the reliability of the connection between the first insulating member 112 and the cover plate 111.

[0083] Based on the cover plate assembly 100 provided in the above example, referring to Figure 3, the electrode terminal 120 may further include a third insulating member 121, a terminal piece 122, a sealing member 124, and a terminal post 125. The third insulating member 121 is disposed on the side of the terminal piece 122 opposite to the second insulating member 123. The sealing member 124 is disposed on the side of the second insulating member 123 opposite to the terminal piece 122. The terminal post 125 connects the third insulating member 121, the terminal piece 122, the second insulating member 123, and the sealing member 124. When the electrode terminal 120 is connected to the cover plate 110, the terminal piece 122 is in contact with the surface of the cover plate 111.

[0084] The third insulating member 121, terminal piece 122, sealing member 124, and second insulating member 123 may be provided with connection holes, and the terminal post 125 may pass through the connection holes to connect the third insulating member 121, terminal piece 122, sealing member 124, and second insulating member 123. The third insulating member 121 may be at least partially disposed between the terminal post 125 and the terminal piece 122. Based on this, the third insulating member 121 can reduce the possibility of external dust, water, etc. entering the battery through the connection gap between the terminal post 125 and the terminal piece 122.

[0085] The third insulating component 121 can also isolate the positive and negative terminals of the battery, reducing the possibility of a short circuit between the positive and negative terminals and further ensuring the safety of battery use.

[0086] The seal 124 can be sleeved on the terminal post 125, and one end of the seal 124 can be connected to the second insulator 123, while the other end of the seal 124 can be connected to the third insulator 121. By providing the seal 124, the sealing performance between the second insulator 123 and the third insulator 121 can be improved, further reducing the possibility of external dust, water, etc., entering the battery.

[0087] The side of the terminal post 125 facing away from the third insulator 121 can be directly or indirectly connected to other structures inside the housing 200 to draw electrical energy from inside the housing 200 to outside the housing 200, so as to provide electrical energy to electrical appliances.

[0088] Since the mounting holes penetrate the cover plate 110, and the cover plate piece 111 is part of the cover plate 110, a portion of the mounting holes are located on the cover plate piece 111. This portion of the mounting holes on the cover plate piece 111 can be a second portion of the mounting holes. The diameter of the second portion of the mounting holes can be smaller than the diameter of the first portion of the mounting holes, or it can be equal to the diameter of the first portion of the mounting holes. This application example does not impose any limitations on this.

[0089] When the electrode terminal 120 is connected to the cover plate 110, the terminal piece 122 is in contact with the cover plate piece 111. This can be understood as at least a portion of the terminal piece 122 can extend into the second part of the mounting hole, and the outer wall of the terminal piece 122 can contact the hole wall of the second part of the mounting hole.

[0090] Along the direction in which the terminal piece 122 is inserted into the cover piece 111, the diameter of the second part of the mounting hole can change or remain unchanged. This application example does not limit the specific implementation of the second part of the mounting hole.

[0091] When the electrode terminal 120 is connected to the cover plate 110, the first insulating member 112 and the second insulating member 123 cooperate to define the position between the cover plate 111 and the terminal plate 122.

[0092] Based on the cover plate assembly 100 provided in the above example, Figure 6 is a schematic diagram of the internal structure of a cover plate assembly provided in this application example. Referring to Figure 6, the distance between the third insulating member 121 and the terminal piece 122 is set to L, which can be greater than or equal to 1 mm. Based on this, it can be ensured that the impact on the third insulating member 121 is reduced when welding the terminal piece 122 and the cover plate piece 111, thus ensuring the reliability of the battery.

[0093] Based on the cover plate assembly 100 provided in the above example, the connection position between the first insulating member 112 and the second insulating member 123 is the first connection point, and the connection position between the terminal piece 122 and the cover plate piece 111 is the second connection point. The first connection point and the second connection point are at least partially staggered.

[0094] There are multiple ways to implement the first connection and the second connection.

[0095] For example, the first connection point can refer to the position where the side of the first insulating member 112 facing the cover plate 111 is connected to the side of the second insulating member 123 facing the terminal plate 122.

[0096] The second connection point can refer to the position where the side of the cover plate 111 facing the first insulator 112 is connected to the side of the terminal plate 122 facing the second insulator 123.

[0097] In this case, there are several ways to achieve the staggered arrangement of the first connection point and the second connection point.

[0098] For example, the diameter of the second insulating member 123 can be smaller than the diameter of the terminal piece 122. Based on this, the distance between the first connection and the mounting hole can be smaller than the distance between the second connection and the mounting hole, so that the first connection and the second connection are staggered.

[0099] For example, the diameter of the second insulating member 123 may also be larger than the diameter of the terminal piece 122. Based on this, the distance between the first connection and the mounting hole may be greater than the distance between the second connection and the mounting hole, so that the first connection and the second connection are staggered.

[0100] For example, the first connection point can also refer to the position where the second insulating member 123 contacts the wall of the first mounting hole.

[0101] The second connection point can also refer to the position where the terminal piece 122 contacts the wall of the second mounting hole. At least one of the diameters of the first and second mounting holes can change, or both can remain constant.

[0102] In this case, there are multiple ways to achieve the staggered arrangement of the first connection point and the second connection point.

[0103] For example, the diameter of the second insulating member 123 can be smaller than the diameter of the terminal piece 122. Based on this, the distance between the first connection and the mounting hole can be smaller than the distance between the second connection and the mounting hole, so that the first connection and the second connection are staggered.

[0104] For example, the diameter of the second insulating member 123 may also be larger than the diameter of the terminal piece 122. Based on this, the distance between the first connection and the mounting hole may be greater than the distance between the second connection and the mounting hole, so that the first connection and the second connection are staggered.

[0105] Furthermore, since the diameter of the second insulating member 123 is larger than the diameter of the terminal piece 122, the insulation reliability of the battery can be further enhanced.

[0106] For example, when at least one of the diameters of the first and second mounting holes changes, the distances from the mounting holes to the sides of the first and second connections that are close to each other can be equal.

[0107] In summary, the staggered arrangement of the first connection and the second connection can prolong the path of electrolyte leakage from the inside and outside of the housing 200, thereby reducing the possibility of electrolyte leakage from the housing 200.

[0108] Based on the cover plate assembly 100 provided in the above example, please refer to Figure 6. The diameter of the second insulating member 123 can be larger than the diameter of the terminal piece 122.

[0109] The diameter of the second insulating member 123 is set as D1, and the diameter of the terminal piece 122 is set as D2. For example, 1.1D2≤D1≤1.2D2.

[0110] Based on this, after the cover plate 110 and the electrode terminal 120 are engaged, the gap between the first insulating member 112 and the second insulating member 123 can be reduced, thereby reducing the possibility of a short circuit in the battery.

[0111] Based on the cover plate assembly 100 provided in the above example, some mounting holes provided on the cover plate piece 111 include a first split hole and a second split hole that are interconnected. The first split hole is provided on the side of the cover plate piece 111 away from the first insulating member 112, and the second split hole is provided on the side of the cover plate piece 111 facing the first insulating member 112. The diameter of the first split hole is larger than the diameter of the second split hole.

[0112] Terminal piece 122 includes a first part and a second part connected to each other. The first part is closer to the second insulating member 123 than the second part. The diameter of the first part is larger than the diameter of the second part. The first part mates with the first hole, and the second part mates with the second part.

[0113] The mounting holes provided on the cover plate 111 can be the second set of mounting holes mentioned above.

[0114] When the diameter of the first split hole is larger than the diameter of the second split hole, during the process of the terminal piece 122 and the cover plate 111 engaging, the second part can enter the first split hole first, that is, the end with the smallest size of the terminal piece 122 enters the part with the largest size of the second mounting hole first, which can improve the assembly efficiency of the terminal piece 122 and the cover plate 111.

[0115] Furthermore, since the diameter of the first dividing hole is larger than the diameter of the second dividing hole, a first mating surface can be formed at the transition between the first and second dividing holes. Similarly, since the diameter of the first split piece is larger than the diameter of the second split piece, a second mating surface can be formed at the transition between the first and second split pieces. During the mating process of the terminal piece 122 and the cover plate 111, the first and second mating surfaces come into contact to restrict the relative positions of the terminal piece 122 and the cover plate 111. This allows the side of the cover plate 111 facing away from the first insulating member 112 to be flush with the side of the terminal piece 122 facing away from the second insulating member 123, facilitating the connection of the cover plate 111 and the terminal piece 122 by butt welding, thus forming a single unit between the cover plate 110 and the electrode terminal 120.

[0116] Based on the cover plate assembly 100 provided in the above example, please refer to Figure 2. The cover plate assembly 100 may also include a current collector 130, which is disposed on the side of the pole post 125 near the first insulating member 112.

[0117] The manifold 130 can be a flat manifold 130, a three-dimensional manifold 130, a flexible manifold 130, or other types of manifold 130. This application example does not limit the specific type of manifold 130. Hereinafter, only the flat manifold 130 will be described as an example.

[0118] The manifold 130 can be welded to the pole post 125 outside the housing 200, or the manifold 130 and the pole post 125 can be welded inside the housing 200.

[0119] When the manifold 130 and the pole post 125 are welded outside the housing 200, the manifold 130 and the pole post 125 can be connected by laser welding on the side of the manifold 130 away from the pole post 125. Since the welding is performed outside the housing 200, it is easier to operate and the welding quality is easier to ensure compared to welding inside the housing 200. In addition, the welding slag generated during the welding process is easier to clean.

[0120] Furthermore, since the collector plate 130 is welded onto the pole post 125, and the collector plate 130 is thinner than the pole post 125, a thin-to-thick welding method is used in the welding process between the collector plate 130 and the pole post 125.

[0121] Because the electrode post 125 is thicker, it has better thermal conductivity and can effectively absorb and disperse the heat generated during the welding process. This can reduce the occurrence of local overheating of the manifold 130 during the welding process and ensure the welding yield of the manifold 130 and the electrode post 125.

[0122] Furthermore, since the manifold 130 is welded to the pole post 125, the pole post 125 can provide a certain supporting force for the manifold 130. Based on this, the amplitude of displacement or vibration of the manifold 130 relative to the pole post 125 during the welding process can be reduced, and the welding yield of the manifold 130 and the pole post 125 can also be guaranteed.

[0123] Based on the cover plate assembly 100 provided in the above example, Figure 7 is a structural schematic diagram of a collector plate provided in this application example. Referring to Figure 7, the diameter of the terminal piece 122 can be smaller than the diameter of the cover plate piece 111.

[0124] The diameter of the cover plate 111 is set to D3. For example, please refer to Figure 6, where 0.25D3≤D2≤0.55D3.

[0125] Based on this, the area of ​​the terminal piece 122 covering the current collector 130 can be smaller, and the area of ​​the current collector 130 used for laser welding with the terminal post 125 can be larger, thereby shortening the current path of the battery and improving the performance of the battery.

[0126] Based on the cover plate assembly 100 provided in the above example, please refer to Figure 7. At least one through hole 131 may be provided on the manifold 130. During the welding process, the through hole 131 can provide deformation space for the manifold 130, which deforms due to heat, thereby reducing the degree of deformation of the manifold 130.

[0127] Based on the cover plate assembly 100 provided in the above example, at least one positioning groove 132 may be provided on the collector plate 130. During the connection process between the collector plate 130 and the electrode lug or other structural components, the positioning groove 132 can limit the position of the collector plate 130 relative to other connecting structures, improving the assembly efficiency of the collector plate 130 with other structures. The positioning groove 132 can also limit the position of the collector plate 130 relative to the welding mechanism or other structural components, reducing the degree of displacement of the collector plate 130 relative to the welding structure or other structural components, thereby improving the assembly efficiency of the cover plate assembly 100.

[0128] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cover assembly, characterized by include: A cover plate with a mounting hole in the middle, the cover plate including a first insulating element; An electrode terminal includes a terminal piece and a second insulating member. The second insulating member is disposed on one side of the terminal piece. The terminal piece is at least partially inserted through the mounting hole and connected to the cover plate. The second insulating member is in surface contact with the first insulating member.

2. The cover plate assembly of claim 1, wherein, The contact surface between the first insulating member and the second insulating member includes a guide surface and a stop surface. The stop surface is substantially parallel to the terminal piece. One end of the guide surface is connected to the stop surface, and the other end of the guide surface is farther away from the terminal piece than the stop surface.

3. The cover plate assembly according to claim 1 or 2, characterized in that, The cover plate also includes a cover plate sheet, which is connected to the first insulating element.

4. The cover plate assembly of claim 3, wherein, The electrode terminals also include: The third insulating element is disposed on the side of the terminal piece opposite to the second insulating element; A sealing element is disposed on the side of the second insulating element opposite to the terminal piece; The pole connects the third insulating element, the terminal piece, the second insulating element, and the seal.

5. The cover plate assembly of claim 4, wherein, The connection point between the first insulating component and the second insulating component is the first connection point, and the connection point between the terminal piece and the cover plate is the second connection point. The first connection point and the second connection point are at least partially misaligned.

6. The cover plate assembly of claim 4, wherein, The mounting holes provided on the cover plate include a first dividing hole and a second dividing hole that are interconnected. The first dividing hole is located on the side of the cover plate away from the first insulating member, and the second dividing hole is located on the side of the cover plate facing the first insulating member. The diameter of the first dividing hole is larger than the diameter of the second dividing hole. The terminal piece includes a first part and a second part connected to each other. The first part is closer to the second insulating member than the second part. The diameter of the first part is larger than the diameter of the second part. The first part mates with the first hole, and the second part mates with the second part.

7. The cover plate assembly of claim 3, wherein, The cover plate has a connecting groove on the side facing the first insulating member, and the first insulating member has a connecting protrusion on the side facing the cover plate. The connecting protrusion can extend into the connecting groove and connect with the connecting protrusion.

8. The cover plate assembly according to claim 4, characterized in that, It also includes a current collector, which is located on the side of the pole near the first insulating member.

9. A battery, characterized in that, Includes the battery cell, the housing, and the cover assembly as described in any one of claims 1 to 8. The housing has a receiving cavity, the battery cell is disposed in the receiving cavity, and the cover plate assembly is disposed on one side of the battery cell and closes the opening of the receiving cavity.

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

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