Cover plate assembly, battery and electric equipment

Abstract

The utility model provides a cover plate assembly, a battery and electric equipment, and relates to the technical field of batteries. The cover plate assembly comprises a cover plate and an electrode terminal. A mounting hole is formed in the middle of the cover plate, and the cover plate comprises a first insulating part; the electrode terminal comprises a terminal piece and a second insulating piece, the second insulating piece is arranged on one side of the terminal piece, at least part of the terminal piece penetrates through the mounting hole and is connected with the cover plate, and the second insulating piece is in surface contact with the first insulating piece. According to the cover plate assembly provided by the embodiment of the invention, the possibility that different parts of the battery cover plate interfere with each other during assembly can be reduced, and the assembly efficiency and the assembly reliability of the battery cover plate are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cover plate assembly, a battery and an electrical device. Background Art

[0002] A battery is a device that can convert chemical energy into electrical energy, and can provide electrical energy to many electrical appliances, keeping them in working order. Existing batteries are widely used in power fields such as automobiles, engineering machinery and equipment, and ships. They can also be used for household energy storage, industrial and commercial energy storage, and communication base stations.

[0003] The battery generally includes a cover plate assembly and a shell structure. Based on the structure of the existing cover plate assembly, when connecting the battery cover plate assemblies, different parts of the battery cover plate will interfere with each other, thereby affecting the assembly efficiency and assembly reliability of the battery cover plate. Utility Model Content

[0004] The present application provides a cover plate assembly, a battery and an electrical device, which reduce the possibility of mutual interference between different parts of the battery cover plate during assembly and improve the assembly efficiency and assembly reliability of the battery cover plate.

[0005] In the first aspect, the present application provides an example of a cover plate assembly, which includes a cover plate and an electrode terminal. A mounting hole is provided in the middle of the cover plate, and the cover plate includes a first insulating member; the electrode terminal includes a terminal piece and a second insulating member, the second insulating member is provided on one side of the terminal piece, the terminal piece is at least partially passed through the mounting hole and connected to the cover plate, and the second insulating member is in surface contact with the first insulating member.

[0006] In the example of this application, since the cover plate and the electrode terminal are separately arranged, the electrode terminal can be connected with other structures first, and then the cover plate and the electrode terminal can be connected. Based on this, the influence of the cover plate on the matching of the electrode terminal with other structures can be reduced, and the assembly quality and assembly efficiency of the cover plate assembly can be improved.

[0007] During the assembly or use of the cover assembly, the first insulating member and the second insulating member cooperate to buffer the pressure between different components in the cover assembly, reduce the amplitude of vibration between different components, and thereby reduce the possibility of damage to the internal structure of the battery due to pressure and vibration.

[0008] In some possible implementations, 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 basically 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.

[0009] By providing the guide surface, when the second insulating member is assembled with the first insulating member, the second insulating member can first enter the end with a larger aperture of the first mounting hole, so that the assembly efficiency of the second insulating member and the first insulating member can be improved. By providing the stop surface, the position of the second insulating member relative to the first insulating member can be limited. Since the first insulating member is a part of the cover plate and the second insulating member is a part of the electrode terminal, the stop surface can limit the position of the electrode terminal relative to the cover plate.

[0010] In some possible implementations, the cover plate further includes a cover plate sheet, and the cover plate sheet is connected to the first insulating member.

[0011] In some possible implementations, the electrode terminal further includes a third insulating member, a sealing member, and a pole. The third insulating member is disposed on a side of the terminal piece away from the second insulating member. The sealing member is disposed on a side of the second insulating member away from the terminal piece. The pole connects the third insulating member, the terminal piece, the second insulating member, and the sealing member. When the electrode terminal is connected to the cover plate, the terminal piece is in surface contact with the cover plate.

[0012] In some possible implementations, the connection position between the first insulating member and the second insulating member is the first connection point, the connection position between the terminal piece and the cover plate piece is the second connection point, and the first connection point and the second connection point are at least partially staggered.

[0013] The at least partially staggered arrangement of the first connection point and the second connection point can extend the path for the electrolyte to leak out of the shell, thereby reducing the possibility of leakage of the electrolyte in the shell.

[0014] In some possible implementations, some of the mounting holes provided on the cover plate include a first sub-hole and a second sub-hole that are interconnected, the first sub-hole being provided on a side of the cover plate facing away from the first insulating member, the second sub-hole being provided on a side of the cover plate facing the first insulating member, and the diameter of the first sub-hole being greater than the diameter of the second sub-hole.

[0015] The terminal piece includes a first split body and a second split body connected to each other. The first split body is closer to the second insulating member than the second split body. The diameter of the first split body is larger than that of the second split body. The first split body matches with the first split hole, and the second split body matches with the second split body.

[0016] When the diameter of the first sub-hole is larger than the diameter of the second sub-hole, during the matching process of the terminal piece and the cover plate, the second sub-body can first enter the first sub-hole, that is, the end of the terminal piece with the smallest size first enters the part with the largest size of the second part of the mounting hole, which can improve the assembly efficiency of the terminal piece and the cover plate.

[0017] In addition, since the diameter of the first sub-hole is greater than the diameter of the second sub-hole, a first mating surface can be formed at the transition between the first sub-hole and the second sub-hole. Since the diameter of the first split body is greater than the diameter of the second split body, a second mating surface can be formed at the transition between the first split body and the second split body. During the mating process of the terminal piece and the cover plate piece, the first mating surface contacts the second mating surface to limit the relative position of the terminal piece and the cover plate piece, so that the side of the cover plate piece facing away from the first insulating member and the side of the terminal piece facing away from the second insulating member can be flush, which is convenient for the operator to connect the cover plate piece and the terminal piece by butt welding, so that the cover plate and the electrode terminal form a whole.

[0018] In some possible implementations, a connection groove is provided on a side of the cover plate facing the second insulating member, and a connection protrusion is provided on a side of the second insulating member facing the cover plate, and the connection protrusion can extend into the connection groove and be connected to the connection protrusion.

[0019] Since the connection protrusion is arranged on the first insulating member and the connection groove is arranged on the cover plate, the cooperation between the connection protrusion and the connection groove can realize the connection between the first insulating member and the cover plate, thereby ensuring the connection reliability between the first insulating member and the cover plate.

[0020] In some possible implementations, the cover plate assembly further includes a current collecting plate, which is disposed on a side of the pole close to the first insulating member.

[0021] The second aspect of the present application provides a battery, which includes a battery cell, a shell and a cover assembly provided in any of the above examples, the shell is provided with a accommodating cavity, the battery cell is arranged in the accommodating cavity, and the cover assembly is arranged on one side of the battery cell and closes the cavity opening of the accommodating cavity.

[0022] The beneficial effects of the battery provided in the above second aspect and each possible design of the above second aspect can refer to the beneficial effects brought about by the above first aspect and each possible implementation method of the first aspect, and will not be repeated here.

[0023] A third aspect of the present application provides an electrical device, which includes the battery mentioned in the above example.

[0024] The beneficial effects of the electrical equipment provided in the third aspect and each possible design of the third aspect can be referred to the beneficial effects brought about by the second aspect and each possible implementation method of the second aspect, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of a battery provided as an example of this application.

[0026] Figure 2 A schematic diagram of the exploded structure of a cover assembly provided as an example of this application.

[0027] Figure 3 A schematic diagram of the exploded structure of an electrode terminal provided as an example of this application.

[0028] Figure 4 A schematic diagram of the exploded structure of a cover plate provided as an example of this application.

[0029] Figure 5 A schematic diagram of the structure of a cover plate provided as an example of this application.

[0030] Figure 6 A schematic diagram of the internal structure of a cover assembly provided as an example of this application.

[0031] Figure 7 A schematic diagram of the structure of a current collecting plate provided as an example of this application.

[0032] Description of reference numerals:

[0033] 100, cover plate assembly; 110, cover plate; 111, cover plate sheet; 1111, connecting groove; 112, first insulating member; 1121, connecting protrusion; 120, electrode terminal; 121, third insulating member; 122, terminal sheet; 123, second insulating member; 124, sealing member; 125, pole; 130, collecting plate; 131, through hole; 132, positioning groove; 200, shell. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the examples of this application clearer, the technical solution in the examples of this application will be clearly and completely described below in conjunction with the drawings in the examples of this application. Obviously, the described examples are part of the examples of this application, not all of them. Based on the examples in this application, all other examples obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application herein are only for the purpose of describing specific examples and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0036] Reference to "examples" herein means that a particular feature, structure, or characteristic described in conjunction with the examples may be included in at least one example of the present application. The appearance of the phrase "example" in various locations in the specification does not necessarily refer to the same example, nor is it an independent or alternative example that is mutually exclusive with other examples. It is explicitly and implicitly understood by those skilled in the art that the examples described herein may be combined with other examples.

[0037] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0038] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the socket of the present application.

[0039] In addition, the terms "first", "second", etc. in the specification and claims of this application or the above-mentioned 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.

[0040] In the description of the present application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two).

[0041] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a barrier, such as a fixed connection through screws, bolts or other barrier; the physical connection may also be a detachable connection, such as a mutual snap-on or snap-fit ​​connection; the physical connection may also be an integral connection, such as a connection formed by welding, bonding or integral molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0042] A battery is a device that can provide electrical energy to electrical appliances, allowing them to be in working condition. A battery generally includes a cover plate structure and a housing structure.

[0043] The existing cover plate structure includes a pole and a cover plate, which are connected together by penetration welding to form an integrated structure, resulting in a low welding yield of the entire cover plate structure. In order to improve the welding yield of the cover plate structure, the requirements for the welding surface will be increased, and the processing cost of the cover plate structure will be increased.

[0044] Based on the above, the present application example provides a cover assembly, a battery and an electrical device.

[0045] In order to enable those skilled in the art to better understand the present application, the cover assembly and the battery provided in the example of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0046] Exemplarily, the present application example provides an electrical device, which includes a battery.

[0047] The electrical equipment uses a battery as its power source. The electrical equipment may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc.

[0048] Next, a brief introduction to the batteries mentioned in the above examples is given.

[0049] For example, Figure 1 For the structural diagram of a battery provided for this application, please refer to Figure 1 The battery may include a housing 200, a cover assembly 100, and one or more battery cells. The housing 200 is provided with a receiving cavity, the battery cell is arranged in the receiving cavity, and the cover assembly 100 is arranged on one side of the battery cell and closes the cavity opening of the receiving cavity.

[0050] The housing 200 may adopt various structures. For example, the housing 200 may be a cylinder, a cuboid or other cubes. The present application example only describes a cylindrical battery as an example.

[0051] Each battery cell may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0052] Next, the specific structure of the cover plate assembly 100 is described in detail.

[0053] For example, Figure 2 A schematic diagram of an exploded structure of a cover plate assembly provided as an example of this application, Figure 3 For an exploded schematic diagram of an electrode terminal provided as an example of this application, please refer to Figure 2 and Figure 3 The present application example provides a cover plate assembly 100, which may include a cover plate 110 and an electrode terminal 120. A mounting hole is provided in the middle of the cover plate 110, and the cover plate 110 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 provided on one side of the terminal piece 122, the terminal piece 122 is at least partially passed through the mounting hole and connected to the cover plate 110, and the second insulating member 123 is in surface contact with the first insulating member 112.

[0054] The setting of the mounting hole can be changed according to the setting method 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 set at the geometric center of the cover plate 110, and the mounting hole can also be set away from the geometric center of the cover plate 110. The setting position of the mounting hole can also change according to the setting position of the terminal. The example of this application does not limit the specific setting method of the mounting hole, as long as it is ensured that the electrode terminal 120 can be inserted into the mounting hole, and the electrode terminal 120 can cooperate with the cover plate 110 through the mounting hole.

[0055] The electrode terminal 120 is directly or indirectly connected to the winding core in the battery cell, thereby outputting the electric energy converted in the battery cell to the outside of the battery. For details on the connection method between the electrode terminal and the winding core, please refer to the relevant description below.

[0056] The first insulating member 112 and the second insulating member can be made of insulating materials, such as silicone rubber, nitrile rubber, ethylene propylene rubber or other insulating materials. The manufacturing material of the first insulating member 112 can be the same as the manufacturing material of the second insulating member 123, or different, and this application example does not make specific restrictions on this.

[0057] The terminal piece 122 can be made of a metal material, and the terminal piece 122 cooperates with the second insulating member 123 to seal the opening of the accommodating cavity provided in the housing 200. Compared with the terminal piece 122, the second insulating member 123 is closer to the housing 200, so the second insulating member 123 can seal the opening of the accommodating cavity and reduce the possibility of leakage of the electrolyte in the housing 200.

[0058] When the electrode terminal 120 is connected to the cap plate 110, the first insulating member 112 is in surface contact with the second insulating member 123. The contact surface between the first insulating member 112 and the second insulating member 123 may be a plane, a plurality of connected planes, or a curved surface. The present application example does not specifically limit the contact surface between the first insulating member 112 and the second insulating member 123.

[0059] 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 by splitting an insulating member. The example of the present application does not limit the specific molding method of the first insulating member 112 and the second insulating member 123.

[0060] The cap plate 110 and the electrode terminal 120 may be mated inside the housing 200 or outside the housing 200 .

[0061] The cover plate 110 and the electrode terminal 120 may be matched after the electrode terminal 120 is matched with other structural parts. The cover plate 110 and the electrode terminal 120 may also be matched after the electrode terminal 120 is matched with other structural parts. This application example does not make any specific restrictions on this.

[0062] The cooperation between the first insulating member 112 and the second insulating member 123 can limit the position of the cap plate 110 relative to the cap plate 110 to a certain extent, thereby facilitating the cooperation between the cap plate 110 and the electrode terminal 120 .

[0063] The cap plate 110 and the electrode terminal 120 may be connected by welding, riveting, bolts or other connecting members.

[0064] In summary, in the example of the present application, since the cover plate 110 and the electrode terminal 120 are separately provided, the electrode terminal 120 can be connected with other structures first, and then the cover plate 110 and the electrode terminal 120 can be connected. Based on this, the influence of the cover plate 110 on the cooperation of the electrode terminal 120 with other structures can be reduced, and the assembly quality and assembly efficiency of the cover plate assembly can be improved.

[0065] During the assembly or use of the cover assembly, the first insulating member 112 and the second insulating member 123 cooperate to buffer the pressure between different components in the cover assembly, reduce the amplitude of vibration between different components, and thereby reduce the possibility of damage to the internal structure of the battery due to pressure and vibration.

[0066] Based on the cover 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 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.

[0067] The stop surface is substantially parallel to the terminal piece 122 , and an angle between the stop surface and the terminal piece 122 is less than or equal to 5 degrees.

[0068] 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, an angle can be set between the guide surface and the stop surface, and the angle can be a right angle or an obtuse angle.

[0069] Since the mounting hole is set through the cover plate 110 and the first insulating member 112 is a part of the cover plate 110, part of the mounting hole is set on the first insulating member 112, and the part of the mounting hole can be the first part of the mounting hole. The second insulating member 123 passes through the first part of the mounting hole on the first insulating member 112 and cooperates with the first insulating member 112.

[0070] When the angle between the guide surface and the stop surface is an obtuse angle, when the second insulating member 123 is assembled with the first insulating member 112, the second insulating member 123 can first enter the end with the larger aperture of the first part of the mounting hole, thereby improving the assembly efficiency of the second insulating member 123 and the first insulating member 112.

[0071] 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, and 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 a part of the cover plate 110 and the second insulating member 123 is a part of the electrode terminal 120, the stop surface can limit the position of the electrode terminal 120 relative to the cover plate 110.

[0072] In summary, by providing the guide surface, when the second insulating member 123 is assembled with the first insulating member 112, the second insulating member 123 can first enter the end with a larger aperture of the first portion of the mounting hole, so that the assembly efficiency of the second insulating member 123 and the first insulating member 112 can be improved. By providing the stop surface, the position of the second insulating member 123 relative to the first insulating member 112 can be limited. Since the first insulating member 112 is a part of the cover plate 110 and the second insulating member 123 is a 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] Based on the cover plate assembly 100 provided in the above example, Figure 4 For an exploded structural diagram of a cover plate 110 provided as an example of this application, please refer to Figure 4 The cover plate 110 may further include a cover plate sheet 111 , and the cover plate sheet 111 is connected to the first insulating member 112 .

[0074] The cover plate 111 may be made of a conductive material, such as aluminum and its alloys or other conductive materials. The present application example does not limit the specific manufacturing material of the cover plate 111.

[0075] The cover plate 111 can be welded to the first insulating member 112, the cover plate 111 can be bonded to the first insulating member 112, the cover plate 111 can also be connected to the first insulating member 112 by connecting members such as rivets and threaded connectors, or the cover plate 111 can be connected to the first insulating member 112 by other methods. The example of this application does not specifically limit the connection method between the cover plate 111 and the first insulating member 112. The example of this application is only described by taking the welding of the cover plate 111 and the first insulating member 112 as an example.

[0076] The first insulating member 112 may be disposed between the cover plate 111 and the housing 200. Based on this, the first insulating member 112 may improve the sealing performance of the battery, reduce the possibility of external liquids, dust, etc. entering the battery and the interior, and may also reduce the possibility of electrolyte leakage, thereby ensuring the reliability of the battery.

[0077] In addition, based on the insulation performance of the first insulating member 112 , the first insulating member 112 can also reduce the possibility of a short circuit between the positive electrode of the battery and the negative electrode of the battery.

[0078] Based on the cover plate assembly 100 provided in the above example, Figure 5 For a structural diagram of a cover plate provided for this application example, please refer to Figure 4 and Figure 5 A connecting protrusion 1121 may be provided on one side of the first insulating member 112 facing the cover plate 111 , and a connecting groove 1111 may be provided on one side of the cover plate 111 facing the first insulating member 112 , and the connecting protrusion 1121 can extend into the connecting groove 1111 .

[0079] The number of connecting protrusions 1121 may be one, two, three, four or even more.

[0080] The connection protrusion 1121 and the connection groove 1111 can be connected together by ultrasonic welding. Based on this, during the ultrasonic welding of the connection protrusion 1121 and the connection groove 1111, the connection protrusion 1121 can melt during the ultrasonic welding process, and then be connected to the connection groove 1111 under the action of ultrasonic welding.

[0081] Since the connecting protrusion 1121 is arranged on the first insulating member 112 and the connecting groove 1111 is arranged 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, thereby ensuring the connection reliability between the first insulating member 112 and the cover plate 111.

[0082] Based on the cover plate assembly 100 provided in the above example, please refer 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 pole 125. The third insulating member 121 is disposed on a side of the terminal piece 122 away from the second insulating member 123. The sealing member 124 is disposed on a side of the second insulating member 123 away from the terminal piece 122. The pole 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 surface contact with the cover plate piece 111.

[0083] The third insulating member 121, the terminal piece 122, the sealing member 124 and the second insulating member 123 may be provided with connection holes, and the pole 125 may be inserted into the connection hole to connect the third insulating member 121, the terminal piece 122, the sealing member 124 and the second insulating member 123. At least part of the third insulating member 121 may be provided between the pole 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 from the connection gap between the pole 125 and the terminal piece 122.

[0084] The third insulating member 121 can also isolate the positive electrode and the negative electrode of the battery, thereby reducing the possibility of a short circuit between the positive electrode and the negative electrode of the battery, and further ensuring the safety of the battery.

[0085] The seal 124 can be sleeved on the pole 125, and one end of the seal 124 can be connected to the second insulating member 123, and the other end of the seal 124 can be connected to the third insulating member 121. By providing the seal 124, the sealing between the second insulating member 123 and the third insulating member 121 can be improved, and the possibility of external dust, water, etc. entering the battery can be further reduced.

[0086] The side of the pole 125 facing away from the third insulating member 121 can be directly or indirectly connected to other structures in the shell 200 to lead the electric energy in the battery from the shell 200 to the outside of the shell 200, so as to provide electric energy for electrical appliances.

[0087] Since the mounting holes are set through the cover plate 110, and the cover plate sheet 111 is a part of the cover plate 110, some of the mounting holes are set on the cover plate sheet 111, and some of the mounting holes on the cover plate sheet 111 can be the second part of the mounting holes. The aperture of the second part of the mounting holes can be smaller than the aperture of the first part of the mounting holes, and the aperture of the second part of the mounting holes can also be equal to the aperture of the first part of the mounting holes, and this application example does not limit this.

[0088] When the electrode terminal 120 is connected to the cover plate 110, the terminal piece 122 is in surface contact with the cover plate piece 111. It can be understood that at least part of the terminal piece 122 can extend into the second part mounting hole, and the outer wall of the terminal piece 122 can contact the hole wall of the second part mounting hole.

[0089] Along the direction in which the terminal piece 122 is inserted into the cover plate piece 111, the aperture of the second part mounting hole may change, or the aperture of the second part mounting hole may remain unchanged. The example of this application does not limit the specific implementation method of the second part mounting hole.

[0090] When the electrode terminal 120 is connected to the cap plate 110 , the first insulating member 112 cooperates with the second insulating member 123 to define the position between the cap plate piece 111 and the terminal piece 122 .

[0091] Based on the cover plate assembly 100 provided in the above example, Figure 6 For a schematic diagram of the internal structure of a cover assembly provided for this application example, please refer to Figure 6 , the distance between the third insulating member 121 and the terminal piece 122 is set to L, and L can be greater than or equal to 1 mm. Based on this, it can be ensured that when the terminal piece 122 and the cover plate piece 111 are welded, the impact on the third insulating member 121 is reduced, and the reliability of the battery is guaranteed.

[0092] Based on the cover 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, the connection position between the terminal piece 122 and the cover piece 111 is the second connection point, and the first connection point and the second connection point are at least partially staggered.

[0093] The first connection point and the second connection point may be implemented in a variety of ways.

[0094] For example, the first connection point may refer to a position where a side of the first insulating member 112 facing the cover plate 111 is connected to a side of the second insulating member 123 facing the terminal plate 122 .

[0095] The second connection point may refer to a position where a side of the cover plate 111 facing the first insulating member 112 is connected to a side of the terminal plate 122 facing the second insulating member 123 .

[0096] In this case, there are many ways to implement the staggered arrangement of the first connection point and the second connection point.

[0097] Exemplarily, the diameter of the second insulating member 123 may be smaller than the diameter of the terminal piece 122. Based on this, the distance between the first connection and the mounting hole may be smaller than the distance between the second connection and the mounting hole, so that the first connection and the second connection are staggered.

[0098] Exemplarily, the diameter of the second insulating member 123 may also be greater 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.

[0099] For example, the first connection point may also refer to a position where the second insulating member 123 contacts the hole wall of the first portion of the mounting hole.

[0100] The second connection point may also refer to the position where the terminal piece 122 contacts the hole wall of the second portion of the mounting hole. At least one of the aperture of the first portion of the mounting hole and the aperture of the second portion of the mounting hole may change, or the aperture of the first portion of the mounting hole and the aperture of the second portion of the mounting hole may both remain unchanged.

[0101] In this case, there are many ways to implement the staggered arrangement of the first connection point and the second connection point.

[0102] Exemplarily, the diameter of the second insulating member 123 may be smaller than the diameter of the terminal piece 122. Based on this, the distance between the first connection and the mounting hole may be smaller than the distance between the second connection and the mounting hole, so that the first connection and the second connection are staggered.

[0103] Exemplarily, the diameter of the second insulating member 123 may also be greater 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.

[0104] In addition, since the diameter of the second insulating member 123 is greater than the diameter of the terminal piece 122, the insulation reliability of the battery can be further enhanced.

[0105] Exemplarily, when at least one of the diameter of the first portion of the mounting hole and the diameter of the second portion of the mounting hole changes, the positions of the mounting holes at the sides where the first connection and the second connection are close to each other may be equal.

[0106] In summary, the at least partially staggered arrangement of the first connection point and the second connection point can extend the path for the electrolyte to leak out of the shell 200 , thereby reducing the possibility of leakage of the electrolyte in the shell 200 .

[0107] 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 may be greater than the diameter of the terminal piece 122 .

[0108] The diameter of the second insulating member 123 is assumed to be D1, and the diameter of the terminal piece 122 is assumed to be D2. For example, 1.1D2≤D1≤1.2D2.

[0109] Based on this, after the cover plate 110 is matched with the electrode terminal 120, the gap between the first insulating member 112 and the second insulating member 123 can be made smaller, thereby reducing the possibility of a short circuit in the battery.

[0110] Based on the cover plate assembly 100 provided in the above example, some mounting holes provided on the cover plate 111 include a first sub-hole and a second sub-hole that are interconnected. The first sub-hole is provided on the side of the cover plate 111 that is away from the first insulating member 112, and the second sub-hole is provided on the side of the cover plate 111 that is toward the first insulating member 112. The diameter of the first sub-hole is greater than the diameter of the second sub-hole.

[0111] The terminal piece 122 includes a first split body and a second split body connected to each other. The first split body is closer to the second insulating member 123 than the second split body. The diameter of the first split body is larger than that of the second split body. The first split body matches with the first split hole, and the second split body matches with the second split body.

[0112] The partial mounting holes provided on the cover plate 111 may be the second partial mounting holes mentioned above.

[0113] When the diameter of the first sub-hole is larger than the diameter of the second sub-hole, during the matching process of the terminal piece 122 and the cover piece 111, the second sub-body can first enter the first sub-hole, that is, the end of the terminal piece 122 with the smallest size first enters the part with the largest size of the second part of the mounting hole, which can improve the assembly efficiency of the terminal piece 122 and the cover piece 111.

[0114] In addition, since the diameter of the first sub-hole is greater than the diameter of the second sub-hole, a first mating surface can be formed at the transition between the first sub-hole and the second sub-hole. Since the diameter of the first split body is greater than the diameter of the second split body, a second mating surface can be formed at the transition between the first split body and the second split body. During the mating process of the terminal piece 122 and the cover plate piece 111, the first mating surface contacts the second mating surface to limit the relative position of the terminal piece 122 and the cover plate piece 111, so that the side of the cover plate piece 111 facing away from the first insulating member 112 and the side of the terminal piece 122 facing away from the second insulating member 123 can be flush, which is convenient for the operator to connect the cover plate piece 111 and the terminal piece 122 by butt welding, so that the cover plate 110 and the electrode terminal 120 form a whole.

[0115] Based on the cover plate assembly 100 provided in the above example, please refer to Figure 2 The cover plate assembly 100 may further include a current collecting plate 130 , which is disposed on a side of the pole 125 close to the first insulating member 112 .

[0116] The collector plate 130 may be a flat collector plate 130, a three-dimensional collector plate 130, a flexible collector plate 130 or other types of collector plates 130. The present application example does not limit the specific type of the collector plate 130. Next, only the flat collector plate 130 is used as an example for description.

[0117] The collecting plate 130 and the pole 125 may be welded outside the housing 200 , or the collecting plate 130 and the pole 125 may be welded inside the housing 200 .

[0118] When the collector plate 130 and the pole 125 are welded outside the housing 200, the collector plate 130 and the pole 125 can be connected by laser welding on the side of the collector plate 130 away from the pole 125. Since the welding is performed outside the housing 200, compared with welding inside the housing 200, the welding is easier to operate, the welding quality is easier to ensure, and the welding slag generated during the welding process is easier to clean.

[0119] In addition, since the collecting plate 130 is welded to the pole 125 , the collecting plate 130 is relatively thin and the pole 125 is relatively thick. Therefore, in the welding process of the collecting plate 130 and the pole 125 , a thin-weld-thickness welding method is adopted.

[0120] Since the pole 125 is thicker and has better thermal conductivity, it can effectively absorb and disperse the heat generated during the welding process, thereby reducing the occurrence of local overheating of the collecting plate 130 during the welding process and ensuring the welding yield of the collecting plate 130 and the pole 125.

[0121] In addition, since the current collecting plate 130 is welded to the pole 125, the pole 125 can provide a certain support force for the current collecting plate 130. Based on this, the displacement or vibration amplitude of the current collecting plate 130 relative to the pole 125 during the welding process can be reduced, and the welding yield of the current collecting plate 130 and the pole 125 can also be guaranteed.

[0122] Based on the cover plate assembly 100 provided in the above example, Figure 7 For a schematic diagram of the structure of a collector provided in this application example, please refer to Figure 7 , the diameter of the terminal piece 122 may be smaller than the diameter of the cover plate piece 111 .

[0123] The diameter of the cover plate 111 is set to D3. For example, please refer to Figure 6 , 0.25D3≤D2≤0.55D3.

[0124] Based on this, the area of ​​the terminal piece 122 covering the current collecting plate 130 can be made smaller, so that the area of ​​the current collecting plate 130 used for laser welding with the pole 125 is larger, thereby shortening the current flow path of the battery and improving the performance of the battery.

[0125] 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 current collecting plate 130. During the welding process, the through hole 131 may provide a deformation space for the current collecting plate 130 that is deformed due to heat, thereby reducing the deformation degree of the current collecting plate 130.

[0126] Based on the cover plate assembly 100 provided in the above example, at least one positioning groove 132 may be provided on the current collecting plate 130. In the process of connecting the current collecting plate 130 with the pole lug or other structural parts, the position between the current collecting plate 130 and other connecting structures may be limited by the positioning groove 132, thereby improving the assembly efficiency of the current collecting plate 130 and other structures. The position between the current collecting plate 130 and the welding mechanism or other structural parts may also be limited by the positioning groove 132, thereby reducing the degree of displacement of the current collecting plate 130 relative to the welding structure or other structural parts, thereby improving the assembly efficiency of the cover plate assembly 100.

[0127] Finally, it should be noted that the above embodiments are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate, with a mounting hole in the middle, the cover plate comprising a first insulating member; The electrode terminal comprises a terminal piece and a second insulating member, wherein the second insulating member is arranged on one side of the terminal piece, the terminal piece is at least partially passed through the mounting hole and connected to the cover plate, and the second insulating member is in surface contact with the first insulating member.

2. The cover plate assembly according to claim 1, characterized in that: The contact surface between the first insulating member and the second insulating member includes a guide surface and a stop surface, wherein 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 further comprises a cover plate sheet, and the cover plate sheet is connected to the first insulating member.

4. The cover plate assembly according to claim 3, characterized in that: The electrode terminal further includes: A third insulating member, disposed on a side of the terminal piece away from the second insulating member; A sealing member, provided on a side of the second insulating member away from the terminal piece; The pole is connected to the third insulating member, the terminal piece, the second insulating member and the sealing member.

5. The cover plate assembly according to claim 4, characterized in that: The connection position between the first insulating member and the second insulating member is a first connection point, the connection position between the terminal piece and the cover plate piece is a second connection point, and the first connection point and the second connection point are at least partially staggered.

6. The cover plate assembly according to claim 4, characterized in that: The partial mounting holes provided on the cover plate include a first sub-hole and a second sub-hole which are interlinked with each other, the first sub-hole being provided on a side of the cover plate away from the first insulating member, the second sub-hole being provided on a side of the cover plate facing the first insulating member, and the diameter of the first sub-hole being greater than the diameter of the second sub-hole; The terminal piece includes a first split body and a second split body connected to each other, the first split body is closer to the second insulating member relative to the second split body, the diameter of the first split body is larger than the diameter of the second split body, the first split body cooperates with the first split hole, and the second split body cooperates with the second split body.

7. The cover plate assembly according to claim 3, characterized in that: A connecting groove is provided on one side of the cover plate facing the first insulating member, and a connecting protrusion is provided on one side of the first insulating member facing the cover plate. The connecting protrusion can extend into the connecting groove and be connected with the connecting protrusion.

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

9. A battery, characterized in that: It comprises a battery cell, a shell and a cover assembly as claimed in any one of claims 1 to 8. The shell is provided with a receiving cavity, the battery cell is arranged in the receiving cavity, and the cover plate assembly is arranged on one side of the battery cell and closes the cavity opening of the receiving cavity.

10. An electrical device, characterized in that: A battery comprising the battery of claim 9.

Images