Cover plate assembly, battery, battery pack and electric equipment

Abstract

The invention provides a cover plate assembly, a battery, a battery pack and electric equipment, and relates to the technical field of batteries, the cover plate assembly comprises: a cover plate main body provided with a first through hole; the conductive part is positioned on one side of the first through hole and penetrates through the cover plate main body; the cap component covers the first end, in the thickness direction, of the cover plate assembly so as to seal the first through hole; the lead-out sheet is connected with the conductive piece, the lead-out sheet is located at the second end of the cover plate main body in the thickness direction, and the lead-out sheet partially extends to one side, deviating from the cap component, of the first through hole or into the first through hole and forms a first connecting part connected with the tab; therefore, the part, connected with the lead-out sheet, of the tab can be positioned in the first through hole and / or one end, deviating from the first connecting part, of the first through hole, so that the space utilization rate in the battery shell is effectively improved, and the volume energy density of the battery is improved.

Description

Technical Field

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

[0002] The battery mainly includes a shell, a cover assembly and a battery cell. The battery cell is located inside the shell, and the cover assembly is covered on the shell and seals the shell.

[0003] The cover assembly usually includes a cover body, an electrode column and a lead-out plate arranged on the cover body. The electrode column extends to one end outside the cover body and is connected to an external device, such as a connecting plate of a battery pack, while the lead-out plate is located on the side of the cover body facing the inside of the shell. The lead-out plate is welded to the electrode plate of the battery cell on the side away from the cover body to realize charging and discharging of the battery cell.

[0004] When the battery is in some space-limited areas, such as inside the outer shell of a battery pack, the electrode columns extending outward from the cover body, as well as the space occupied by the lead-out tabs and the tab welding, will compress the available space of the battery cell in the thickness direction of the cover body. That is, the space occupied by the battery in the thickness direction of the cover body cannot be effectively utilized, resulting in a low volume energy density of the battery. Summary of the Invention

[0005] The present application provides a cover assembly, a battery, a battery pack and an electrical device to solve the problem that when the existing battery is in an area with limited space, the space occupied by the battery in the thickness direction of the cover body cannot be effectively utilized, resulting in a low volume energy density of the battery.

[0006] In one aspect, the present application provides a cover plate assembly, comprising:

[0007] a cover plate body, wherein the cover plate body is provided with a first through hole penetrating the cover plate body along a thickness direction of the cover plate body;

[0008] a conductive member, the conductive member being located on one side of the first through hole and penetrating the cover plate body along a thickness direction of the cover plate body;

[0009] a cap component, the cap component being disposed on a first end of the cover plate assembly in a thickness direction and being used to close the first through hole;

[0010] a lead-out piece connected to the conductive member and located at a second end of the cover plate body in a thickness direction, wherein the lead-out piece partially extends to the first through hole and forms a first connecting portion;

[0011] The first connecting portion is at least partially used to connect with a tab extending into the first through hole and / or a tab portion at one end of the first through hole facing away from the first connecting portion.

[0012] In a possible implementation manner, the lead-out piece is connected to the cover plate body at least at one end of the first through hole facing away from the cap component.

[0013] In a possible embodiment, the cover plate body includes a cover plate body and a first insulating member, and opposite sides of the first insulating member are in contact with the cover plate body and the lead-out plate, respectively, and separate the cover plate body and the lead-out plate;

[0014] The cover body and the first insulating member are respectively provided with a coaxial first connecting hole and a second connecting hole, and the first through hole includes the first connecting hole and the second connecting hole.

[0015] In a possible implementation manner, the lead-out plate, the first insulating member, and the cover plate body are riveted together at least on a side of the first through hole facing away from the conductive member.

[0016] In a possible implementation, the lead-out plate, the first insulating member, and the cover body are all provided with coaxial second through holes, and the rivet passes through the cover body, the first insulating member, and the second through hole on the lead-out plate in sequence;

[0017] Among them, a first mounting groove connected to the second through hole is provided on the side of the lead-out piece facing away from the first insulating part, and connecting flanges are provided at both ends of the rivet. One of the two connecting flanges abuts against the side of the cover body facing away from the first insulating part, and the other is located in the first mounting groove and abuts against the bottom of the first mounting groove.

[0018] In a possible implementation manner, the connecting flange abutting against the cover plate body is located between the cap component and the cover plate body.

[0019] In a possible implementation, the cap component includes:

[0020] A cap body, the cap body is connected to the cover plate body and encloses the cap body and the cover plate body to form a mounting cavity;

[0021] a second insulating member, the second insulating member being located in the mounting cavity and connected to the cap body;

[0022] The second insulating member at least partially passes through the first connecting hole and extends into the second connecting hole. The second insulating member is used to separate the tab from the cover plate body and the cap body.

[0023] In a possible implementation, the cap component further includes an explosion-proof valve, which is provided on the cap body and configured to relieve pressure in the installation cavity when the pressure in the installation cavity reaches a preset value.

[0024] In a possible implementation manner, the inner diameter of the first connecting hole is larger than the inner diameter of the second connecting hole, and the first insulating member partially extends into the first connecting hole.

[0025] In a possible embodiment, the cover further includes a third insulating member, a first sealing member, and a fixing ring, wherein the third insulating member and the first sealing member are both sleeved on the outside of the conductive member, and the first sealing member is located between the third insulating member and the cover body, and the fixing ring is sleeved on the outside of the first sealing member;

[0026] The cover body is provided with a first stepped hole for the conductive member to pass through, the first stepped hole having a second stepped surface, one end of the fixing ring is located outside the first stepped hole and abuts against the third insulating member, and the other end of the fixing ring extends into the first stepped hole and abuts against the second stepped surface;

[0027] The first insulating member and the first sealing member both extend at least partially into the first step hole to separate the cover plate body and the conductive member. The first sealing member is used to close the gap between the conductive member and the third insulating member. The first sealing member is also used to close the gap between the conductive member and the first insulating member.

[0028] In one possible implementation, the conductive member includes a first electrode column and a conductive cap. The first electrode column sequentially passes through the third insulating member, the first sealing member, and the cover plate body and is connected to the lead-out plate. The conductive cap is located at an end of the first electrode column away from the lead-out plate.

[0029] A connecting platform is provided at one end of the first electrode column adjacent to the conductive cap, and the connecting platform abuts against an end of the third insulating member facing away from the first sealing member.

[0030] In a possible embodiment, it further includes a fourth insulating member and a second sealing member that are sleeved on the conductive member, the conductive member presses the fourth insulating member onto the cover body, and the second sealing member is partially located between the cover body and the conductive member to close the gap between the conductive member and the cover body.

[0031] In a possible implementation, the conductive member includes a second electrode column and a lead terminal riveted to the second electrode column, the second electrode column sequentially passes through the lead terminal, the fourth insulating member, and the second sealing member, and is riveted to the lead sheet;

[0032] A second mounting groove is provided on the side of the fourth insulating member facing away from the second sealing member, and the lead terminal is at least partially inserted into the second mounting groove. A third mounting groove is provided on the side of the cover body facing away from the first insulating member, and the fourth insulating member is at least partially inserted into the third mounting groove.

[0033] In a second aspect, the present application provides a battery comprising a shell, a battery cell and a cover assembly as described in any one of the first aspects, wherein the battery cell is located in the shell, the cover assembly is used to seal the shell, and the tabs of the battery cell are connected to the lead-out tabs.

[0034] In a third aspect, the present application provides a battery pack comprising the battery described in the second aspect.

[0035] In a fourth aspect, the present application provides an electrical device, including an electrical device, and the battery described in the second aspect or the battery pack described in the third aspect, wherein the battery or the battery pack is used to power the electrical device.

[0036] In the cover assembly, battery, battery pack and electrical equipment provided by the present application, the cover assembly is provided with a cover body, a conductive part, a cap component and a lead-out piece. The cap component is covered on the cover body and closes the first through hole on the cover body. The lead-out piece at least partially extends to the first through hole and forms a first connecting portion. When the cover assembly is assembled with the battery shell, the pole ear of the battery cell can extend into the first through hole, or extend through the first through hole to the end of the first through hole away from the first connecting portion, and the pole ear can be connected to the first connecting portion in the first through hole and / or at the end of the first through hole away from the first connecting portion. Compared with the traditional cover assembly whose lead-out piece can only be connected to the pole ear in the shell away from the side of the cover body, the pole ear can be connected to the lead-out piece. The connection part of the sheet is placed outside the shell, that is, in the first through hole of the cover assembly or the end of the first through hole away from the battery cell, and the end of the conductive member used to connect with the connecting sheet of other equipment or battery pack and the end of the first through hole away from the battery cell are on the same side of the cover body, so that the connection part between the pole ear and the lead-out sheet will not occupy additional space in the thickness direction of the cover body, which can effectively improve the utilization rate of the internal space of the shell, thereby improving the volume energy density of the battery in a limited space. At the same time, the cap component is connected to the cover body after the pole ear is connected to the first connecting part, so that the pole ear and the first connecting part will not be blocked by the cap component when they are connected, and the operation is more convenient. During the use of the battery, the cap component can also protect the pole ear and the lead-out sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0038] Figure 1 A schematic diagram of a first exemplary structure of a cover plate assembly provided in an embodiment of the present application;

[0039] Figure 2 for Figure 1 A schematic structural diagram of the cover plate assembly without the cap assembly;

[0040] Figure 3 for Figure 1 AA section view in;

[0041] Figure 4 for Figure 1 BB cross-section in;

[0042] Figure 5 for Figure 4 A magnified view of the structure within circle A;

[0043] Figure 6 for Figure 4 A magnified view of the structure in circle B;

[0044] Figure 7 A schematic diagram of a second exemplary structure of a cover plate assembly provided in an embodiment of the present application;

[0045] Figure 8 for Figure 7 A magnified view of the structure within circle C;

[0046] Figure 9 for Figure 7 A magnified view of the structure within circle D;

[0047] Figure 10 A schematic diagram of a third exemplary structure of a cover plate assembly provided in an embodiment of the present application;

[0048] Figure 11 for Figure 10 A magnified view of the structure within the middle circle G;

[0049] Figure 12 A schematic diagram of a third exemplary structure of a cover plate assembly provided in an embodiment of the present application;

[0050] Figure 13 for Figure 12 A magnified view of the structure within circle E;

[0051] Figure 14 for Figure 12 A magnified view of the structure within circle F;

[0052] Figure 15 A schematic diagram of the partial structure of a battery provided in an embodiment of the present application.

[0053] Description of reference numerals:

[0054] 100 - cover assembly, 110 - cover body, 111 - cover body, 1111 - second through hole, 1112 - third mounting slot, 1113 - first stepped hole, 112 - first insulating member, 113 - first through hole, 1131 - first connecting hole, 1132 - second connecting hole, 120 - conductive member, 121 - conductive cap, 122 - first electrode column, 1221 - connecting platform, 123 - lead terminal, 124 - second electrode column, 130 - lead sheet , 131-first connecting part, 132-first mounting groove, 133-rivet, 134-connecting flange, 135-first gap, 140-cap component, 141-cap body, 142-explosion-proof valve, 143-second insulating member, 144-mounting cavity, 150-third insulating member, 160-fixing ring, 170-first sealing member, 180-fourth insulating member, 181-second mounting groove, 190-second sealing member, 200-shell, 210-ear.

[0055] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0056] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0057] As mentioned in the background technology, the tabs of the battery cell can only be welded on the side of the lead-out tab facing the battery cell and can only occupy the space inside the shell, while the part of the electrode column connected to the connecting plate of the external device or battery pack needs to extend to the outside of the cover body. This means that after the cover assembly is connected to the shell and the tabs of the battery, in the thickness direction of the cover body, which can also be understood as the height direction of the battery cell, the part of the electrode column extending to the outside of the cover body and the part where the lead-out tab and the tab are connected will occupy additional space relative to the cover body.

[0058] If the battery is placed in a space with limited height, such as in a battery pack, the overall height is fixed. The space occupied in the height direction by the portion of the electrode column extending to the outside of the cover body and the portion where the lead-out tab and the tab are connected will cause the usable space of the battery cell to be compressed. This structure of the cover assembly obviously makes it impossible to effectively utilize the space, resulting in a low volume energy density of the battery.

[0059] In order to avoid the above problems, an embodiment of the present application provides a cover assembly, which can add an installation cavity on the side of the cover body away from the battery cell, and place the connecting part of the pole ear and the lead-out piece in the first through hole and / or the installation cavity on the cover body. The installation cavity and the conductive part on the cover body for connecting to the external device are on the same side of the cover body, so that within a fixed height range, the part of the conductive part extending to the outside of the cover body and the height jointly occupied by the lead-out piece and the pole ear connection part can be minimized, thereby helping to improve the volume energy density of the battery.

[0060] It should be noted that the battery using the cover assembly in the embodiment of the present application can be used alone or in parallel or in series in a battery pack, and the battery and battery pack can be applied to common electrical equipment, including but not limited to vehicles and other energy storage devices, for example: the vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. Correspondingly, the electrical component can be the drive mechanism of the vehicle or the control system of the vehicle. The energy storage device can be a mobile phone, a portable device, a laptop computer, an electric toy, an electric tool, a ship and a spacecraft, etc., wherein the spacecraft can include an airplane, a rocket, a space shuttle or a spacecraft.

[0061] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0062] See Figure 1 、 Figure 2 and Figure 3 As shown, an embodiment of the present application provides a cover assembly 100 , including a cover body 110 , a conductive member 120 , a cap component 140 and a lead-out piece 130 .

[0063] The cover body 110 is provided with a first through hole 113 which passes through the cover body 110 in the thickness direction of the cover body 110. The cover body 110 is used to connect to the battery shell 200. The conductive member 120 is located on one side of the first through hole 113 and passes through the cover body 110. One end of the conductive member 120 used to connect to the external device extends to the outside of the first end in the thickness direction of the cover body 110, that is, it protrudes from the surface of the cover body 110. The other end of the conductive member 120 is connected to the lead-out piece 130 located at the second end in the thickness direction of the cover body 110, for example, by welding or riveting.

[0064] The cap component 140 is covered on the first end of the cover assembly 100 in the thickness direction, and is used to close the first through hole 113, wherein the cap component 140 and the cover body 110 can also be enclosed to form an installation cavity 144 connected to the first through hole 113, and the first installation cavity 144 also protrudes outward from the first end of the cover body 110 in the thickness direction.

[0065] Among them, the lead-out piece 130 partially extends to the first through hole 113 and forms a first connecting portion 131. The pole ear 121 can extend into the first through hole 113 and be connected to the first connecting portion 131, or the pole ear 210 can pass through the first connecting hole 113 and extend to the end of the first through hole 113 away from the battery cell. At this time, the pole ear can be connected to the surface adjacent to the first connecting portion 131 and the first through hole 113, or it can be connected to the surface opposite to the first connecting portion 131 and the cap component 140.

[0066] Specifically, the lead-out piece 130 partially extends to the side away from the cap component 140 or into the first through hole 113, and forms a first connecting portion 131. The projection of the first through hole 113 in the thickness direction of the cover plate body 110 is located outside the first connecting portion 131, so as to form a first gap 135 between the first through hole 113 and the first connecting portion 131. The first gap 135 is used for the battery's pole ear 210 to pass through, so that the portion of the pole ear 210 used to connect with the first connecting portion 131 is located in the first through hole 113 and / or the mounting cavity 144.

[0067] When the cover body 110 is connected to the battery shell 200, the second end is facing the battery cell in the shell 200. At this time, the battery cell's tab 210 can directly extend through the first gap 135 to the first through hole 113, or extend through the first through hole 113 to the installation cavity 144, which can be specifically determined according to the position of the first connecting part 131.

[0068] For example, see Figure 2 and Figure 3 As shown, the first connecting portion 131 is located on the side of the first through hole 113 away from the cap component 140. At this time, if the depth of the first through hole 113 is greater than or equal to the thickness of the tab 210, the tab 210 can extend into the first through hole 113 and connect with part of the surface of the first connecting portion 131.

[0069] For example, see Figure 10 and Figure 11As shown, the lead-out piece 130 protrudes toward the inside of the cap component 140 to form a first connecting portion 131, and the first connecting portion 131 partially extends through the first through hole 113 to the mounting cavity 144. At this time, the tab 210 can only extend into the first through hole 113, and be connected to the outer wall of the first connecting portion 131 only in the first through hole 113. The tab 210 can also extend through the first through hole 113 to the mounting cavity 144, and be connected to the surface of the tab 210 facing the cap component 140 in the mounting cavity 144, or both the portion in the first through hole 113 and the portion in the mounting cavity 144 are connected to the first connecting portion 131.

[0070] It should be noted that the above example is only an illustration of the connection method between the tab 210 and the first connecting part 131, and does not limit it. It is sufficient as long as the connection position of the tab 210 and the first connecting part 131 can be located in the first through hole 113 and / or the mounting cavity 144, and not on the side adjacent to the lead-out piece 130 and the battery cell.

[0071] When assembling the cover assembly 100 with other components of the battery, the tab 210 and the first connecting portion 131 can be connected first by common methods such as welding or bolting, and then the cap component 140 can be assembled to the cover assembly 100. Therefore, during assembly, the operation can be performed directly from the first end of the cover body 110. Compared with the traditional cover assembly 100, the tab 210 and the first connecting portion 131 are more convenient to connect.

[0072] After assembly is complete, the cap component 140 can seal the first through-hole 113, preventing the external environment from affecting the tab 210, the lead-out tab 130, the battery cell, etc. At the same time, the connection between the tab 210 and the first connecting portion 131 is within the first through-hole 113 and / or the mounting cavity 144, and does not occupy additional height in the Z direction. That is, compared to the traditional cover plate assembly 100, only the end of the electrode column connected to the external device needs to occupy the height in the Z direction, while the connection between the tab 210 and the first connecting portion 131 does not occupy the height. When the battery is used in a space with limited height in the Z direction, compared to traditional batteries, the space that can be occupied by the battery cell can be increased, thereby helping to improve the volume energy density of the battery.

[0073] In some embodiments, the first connection portion 131 is located on a side of the first through hole 113 away from the cap component 140 , and a first gap 135 is defined between both sides of the first connection portion 131 in the extension direction of the cover body 110 and the first through hole 113 .

[0074] At this time, the tab 210 can extend into the first through hole 113 from the two first gaps 135 , thereby increasing the contact area between the tab 210 and the lead-out tab 130 .

[0075] In this case, there are at least two ways to connect the tab 210 to the first connecting portion 131:

[0076] Exemplarily, the first connecting portion 131 is a sheet-like structure, the tab 210 extends from the first gap 135 into the first through hole 113, and is bent 90° to fit the surface of the first connecting portion 131 facing away from the battery cell, and is welded to effectively increase the contact area between the tab 210 and the lead-out sheet 130.

[0077] At the same time, welding connection takes up less space than other connection methods such as bolt connection.

[0078] Exemplarily, first connecting ears are provided on both sides of the first connecting portion 131 opposite to the two first gaps 135, and the first connecting ears extend along the Z direction. The first connecting ears extend through the first gap 135 to the first through hole 113, or the first connecting ears extend through the first gap 135 and the first through hole 113 in sequence to the mounting cavity 144, and the surface of the first connecting ear adjacent to the wall of the first through hole 113 is used for welding connection with the pole ear 210.

[0079] It should be noted that the first connecting portion 131 and the first connecting ear are part of the structure on the lead-out piece 130, which can be an integrally formed metal part, and is later subjected to bending, stamping and other operations to form the lead-out piece 130 into the first connecting portion 131 and the first connecting ear and other structures.

[0080] The lead-out tab 130 is usually welded to the conductive part 120, or welded after riveting, and is fixed only by the conductive part 120. The first through hole 113 is located on one side of the conductive part 120. When the tab 210 and the first connecting part 131 are welded, under the pressure of the welding block, the lead-out tab 130 is prone to bending and deformation on the side away from the conductive part 120, affecting the fitting effect between the tab 210 and the first connecting part 131, and reducing the welding yield between the tab 210 and the first connecting part 131.

[0081] For this, see Figure 5 、 Figure 7 and Figure 8 As shown, in this embodiment, the lead-out piece 130 is connected to the cover body 110 at least on the side of the first through hole 113 away from the conductive member 120. For example, the lead-out piece 130 is connected to the surface of the second end of the cover body 110 on the side of the first through hole 113 away from the conductive member 120 by welding, bonding or riveting.

[0082] Exemplarily, the cover body 110 includes a cover body 111 and a first insulating member 112. The opposite sides of the first insulating member 112 are respectively in contact with the cover body 111 and the lead-out piece 130, and separate the cover body 111 and the lead-out piece 130. The cover body 111 is connected to the battery shell 200 to close the shell 200.

[0083] Among them, the cover body 111 and the first insulating part 112 are respectively provided with a coaxial first connecting hole 1131 and a second connecting hole 1132, and the first through hole 113 includes the first connecting hole 1131 and the second connecting hole 1132. The lead-out piece 130 and the cover body 111 can be separated by the first insulating part 112 to perform electrical isolation to prevent short circuit and leakage.

[0084] For example, the lead-out piece 130 is connected to the first insulating member 112 and the cover body 111 by rivets 133. Figure 5 and Figure 8 As shown, a coaxial second through hole 1111 is provided on the lead-out piece 130, the first insulating member 112 and the cover body 111. The rivet 133 sequentially penetrates the cover body 111, the first insulating member 112 and the second through hole 1111 on the lead-out piece 130. At the same time, a first mounting groove 132 communicating with the second through hole 1111 is provided on the side of the lead-out piece 130 away from the first insulating member 112. Connecting flanges 134 are provided at both ends of the rivet 133. One of the two connecting flanges 134 is away from the first insulating member 111 and the cover body 111. The cover body 111 abuts against the lead tab 130 on one side, and the other side is located in the first mounting groove 132 and abuts against the bottom of the first mounting groove 132, thereby pressing the cover body 111, the first insulating member 112, and the conductive member 120 together through the connecting flange 134 to achieve a connection between the three. The cover body 111 has a certain strength, which can provide good support for the lead tab 130 when welding the tab 210 to the first connecting portion 131, reducing the probability of deformation of the lead tab 130 and improving the yield rate of the connection between the tab 210 and the first connecting portion 131. In addition, the first mounting groove 132 is provided on the lead tab 130, and the connecting flange 134 can be embedded in the first mounting groove 132 without protruding outside the lead tab 130, which can prevent the connecting flange 134 from occupying additional height in the Z direction.

[0085] Furthermore, in order to facilitate the connection of the lead-out piece 130, the first insulating piece 112 and the cover body 111, the connecting flange 134 abutting the cover body 111 can be located in the installation cavity 144. During assembly, the lead-out piece 130, the first insulating piece 112 and the cover body 111 can be connected by rivets 133 first, and then the cap part 140 can be installed, which can improve the convenience of assembly.

[0086] It should be noted that when the lead-out piece 130, the first insulating member 112 and the cover body 111 are connected by bonding, the cover body 111 can be bonded to the first insulating member 112, and the insulating member is bonded to the lead-out skin away from the cover body 111. Of course, welding or other methods can also be used for connection in a similar manner, and this embodiment does not limit it here.

[0087] In some embodiments, see Figure 11 As shown, the cap component 140 includes a cap body 141 and a second insulating member 143 . The cap body 141 is connected to the cover plate body 111 and encloses the cover plate body 111 to form an installation cavity 144 . The second insulating member 143 is located in the installation cavity 144 and is connected to the cap body 141 .

[0088] The second insulating member 143 at least partially passes through the first connecting hole 1131 and extends into the second connecting hole 1132 . The second insulating member 143 is used to separate the tab 210 from the cover body 111 and the cap body 141 .

[0089] For example, Figure 11 As shown, the cap body 141 includes a main body and a rib arranged around the edge of the main body. The rib extends along the Z direction and is connected to the cover body 111, thereby enclosing a mounting cavity 144 between the cover body 111 and the cap body 141. The second insulating member 143 is located in the mounting cavity 144 and is connected to the cap body 141. The second insulating member 143 can be an insulating cover shell that is opened toward the side of the pole tab 210, such as a ceramic cover shell or a cover shell made of other insulating materials. The second insulating member 143 extends at least partially into the second connecting hole 1132 toward the side of the pole tab 210, and the projection of the part where the pole tab 210 is connected to the lead-out piece 130 in the Z direction is located within the cover shell, thereby separating the pole tab 210 from the cover body 111, and the pole tab 210 from the cap body 141, so as to achieve better insulation. Of course, the second insulating member 143 is not in direct contact with the pole tab 210, the lead-out piece 130 and the first insulating member 112.

[0090] Among them, Figure 3 As shown, the second insulating member 143 can be of any shape, such as a trumpet-shaped cover with a larger width at the end close to the tab 210 , or a common shape such as a rectangle, which is not limited in this embodiment.

[0091] In some embodiments, the cap component 140 also includes an explosion-proof valve 142. A through hole for installing the explosion-proof valve 142 is opened on the cap body 141, so that the explosion-proof valve 142 can connect the outside world with the interior of the battery shell 200. When the pressure in the installation cavity 144 reaches a preset value, the explosion-proof valve 142 can be opened to relieve the pressure in the installation cavity 144.

[0092] The mounting cavity 144 is connected to the interior of the battery housing 200 through the first through hole 113 and the first gap 135 . Therefore, when the battery experiences thermal runaway, the explosion-proof valve 142 opens to relieve pressure on the battery.

[0093] For example, see Figure 6 As shown, a first mounting hole can be set on the cap body 141, and no hole is opened on the second insulating member 143, but there is a gap between the second insulating member 143 and the end of the first mounting hole, so that the mounting cavity 144 is connected to the first mounting hole, and the explosion-proof valve 142 is set in the first mounting hole.

[0094] For example, see Figure 12 and Figure 13 As shown, a second mounting hole connected to the first mounting hole is provided on the second insulating member 143, and the end of the second insulating member 143 does not contact the lead-out piece 130, the first insulating member 112, the tab 210 and other components, so that the second mounting hole can be connected to the first through hole 113 and the mounting cavity 144, and the explosion-proof valve 142 is provided in the first mounting hole, which can effectively relieve pressure.

[0095] In some embodiments, the inner diameter of the first connecting hole 1131 is larger than the inner diameter of the second connecting hole 1132, and the first insulating member 112 partially extends into a connecting hole, which allows the first connecting hole 1131 to be arranged on the outside of part of the hole wall of the second connecting hole 1132, thereby limiting the relative position of the cover body 111 and the first insulating member 112, and also improving the insulation effect.

[0096] Furthermore, the first connecting hole 1131 is a stepped hole and has a first stepped surface. The part of the cap body 141 used to connect with the cover plate body 111 contacts the first stepped surface, that is, the retaining edge of the cap body 141 abuts against the first stepped surface and the inner wall of the first connecting hole 1131, which is convenient for positioning the cap body 141. At the same time, the contact area between the cap body 141 and the cover plate body 111 can be increased through the first stepped surface, and the cap body 141 can be effectively supported to improve the connection strength.

[0097] Among them, for the entire cover assembly 100, the structures for limiting the conductive member 120 and the lead-out piece 130 include at least the following two types:

[0098] For example, see Figure 7 and Figure 9 As shown, the cover plate assembly 100 further includes a third insulating member 150 , a first sealing member 170 and a fixing ring 160 .

[0099] The third insulating member 150 and the first sealing member 170 are both sleeved outside the conductive member 120 , and the first sealing member 170 is located between the third insulating member 150 and the cover body 110 . The fixing ring 160 is sleeved outside the first sealing member 170 .

[0100] Among them, a first step hole 1113 for the conductive part 120 to pass through is provided on the cover body 111, the first step hole 1113 has a second step surface, one end of the fixing ring 160 is located outside the first step hole 1113 and abuts against the third insulating part 150, and the other end of the fixing ring 160 extends into the first step hole 1113 and abuts against the second step surface.

[0101] The first insulating member 112 and the first sealing member 170 both extend at least partially into the first step hole 1113 to separate the cover plate body 110 and the conductive member 120. The first sealing member 170 is used to close the gap between the conductive member 120 and the third insulating member 150. The first sealing member 170 is also used to close the gap between the conductive member 120 and the first insulating member 112.

[0102] Specifically, the first insulating member 112 protrudes toward the first step hole 1113 at the through hole for the conductive member 120 to pass through, and is partially inserted into the first step hole 1113, so that the first step hole 1113 is partially arranged outside the through hole of the first insulating member 112 for the conductive member 120 to pass through. At the same time, the end of the second step surface can cooperate with the part of the first insulating member 112 that protrudes into the first step hole 1113 to limit the position of the cover body 111. The fixing ring 160 is sleeved on the outside of the conductive part 120 and is located between the cover body 111 and the third insulating part 150, thereby forming a cavity between the conductive part 120, the third insulating part 150, the fixing ring 160 and the first insulating part 112. The first sealing part 170 is located in the cavity, and the first sealing part 170 can be a flexible sealing ring, such as a rubber ring. The top of the first sealing part 170 abuts against the third insulating part 150, the inner side abuts against the conductive part 120, and the bottom abuts against the first insulating part 112. A gap is left between the outer side and the fixing ring 160.

[0103] In addition, to enhance the supporting effect of the fixing ring 160 , the fixing ring 160 may be formed into a C-shaped structure, with its upper end abutting against the lower surface of the third insulating member 150 and its lower end abutting against the second step surface to increase the contact area.

[0104] Furthermore, the conductive member 120 includes a first electrode column 122 and a conductive cap 121. The first electrode column 122 passes through the third insulating member 150, the first sealing member 170 and the cover plate body 110 in sequence and is connected to the lead-out plate 130. The conductive cap 121 is located at the end of the first electrode column 122 away from the lead-out plate 130.

[0105] A connecting platform 1221 is provided at one end of the first electrode column 122 adjacent to the conductive cap 121 , and the connecting platform 1221 abuts against an end of the third insulating member 150 facing away from the first sealing member 170 .

[0106] The lower surface of the conductive cap 121 in the Z direction can be fixedly connected to the upper surface of the first electrode column 122. If the conductive cap 121 and the first electrode column 122 are made of different materials, the first electrode column 122 and the conductive cap 121 can be fixed by brazing, ultrasonic welding, laser welding, etc. For example, if the conductive cap 121 is made of aluminum and the first electrode column 122 is made of copper, the two can be connected using the above methods. If the conductive cap 121 and the first electrode column 122 are made of the same material, such as a copper-aluminum alloy, they can be formed into an integral body.

[0107] When assembling the cover assembly 100, the connecting platform 1221 of the first electrode column 122 is pressed against the side of the third insulating member 150 facing away from the cover body 111, and the lead-out piece 130 is connected to the end of the first electrode column 122 facing away from the conductive cap 121, and is pressed against the side of the first insulating member 112 facing away from the cover body 111, so that the third insulating member 150, the sealing ring, the fixing ring 160 and the cover body 111 and other components can be directly fixed between the third insulating member 150 and the lead-out piece 130.

[0108] For example, see Figure 12 and Figure 14 As shown, the cover assembly 100 also includes a fourth insulating member 180 and a second sealing member 190 which are sleeved on the conductive member 120. The conductive member 120 presses the fourth insulating member 180 onto the cover body 111. The second sealing member 190 is partially located between the cover body 110 and the conductive member 120 to close the gap between the conductive member 120 and the cover body 110.

[0109] Specifically, the conductive member 120 includes a second electrode column 124 and a lead terminal 123 riveted to the second electrode column 124. The second electrode column 124 passes through the lead terminal 123, the fourth insulating member 180 and the second sealing member 190 in sequence, and is riveted to the lead sheet 130. It can also be fixed by welding after riveting.

[0110] A second mounting groove 181 is provided on the side of the fourth insulating member 180 facing away from the second sealing member 190, and the lead terminal 123 is at least partially inserted into the second mounting groove 181. A third mounting groove 1112 is provided on the side of the cover body 111 facing away from the first insulating member 112, and the fourth insulating member 180 is at least partially inserted into the third mounting groove 1112, thereby limiting the position of the fourth insulating member 180 by the lead terminal 123 and the cover body 111, and at the same time, the fourth insulating member 180 can also completely separate the lead terminal 123 and the cover body 111.

[0111] The third mounting hole of the lead-out terminal 123 for the second electrode column 124 to pass through can be set as a stepped hole, and the third mounting hole has a third step surface and a fourth step surface arranged in sequence along the negative direction of the Z direction, and the inner diameter of the third mounting hole increases in sequence along the Z direction. The shape of the second electrode column 124 is adapted to the shape of the third mounting hole, and is limited by the third step surface and the fourth step surface. Of course, the lead-out terminal 123 and the second electrode column 124 can be riveted and then welded to achieve a stable connection.

[0112] In addition, the through hole on the first connecting member for inserting the second electrode column 124 can also be set as a stepped hole, which has a fifth step surface, and the second electrode column 124 has a flange that fits with the fifth step surface, thereby increasing the contact area between the lead-out piece 130 and the second electrode column 124. To match this, the second sealing member 190 can be set as a rubber ring with an L-shaped cross-section along the Z direction, the bottom of which abuts against the flange of the second electrode column 124, the top abuts against the fourth insulating member 180, and the inner side abuts against the second electrode column 124, so as to achieve a better sealing effect, and at the same time, it can also separate the cover body 111 and the second electrode column 124.

[0113] It should be noted that other connection structures between the conductive member 120 and the cover body 111 can also be applied here, and the above examples are only for illustration and not for limitation.

[0114] The present application also provides a battery. Figure 15 As shown, it includes a shell 200, a battery cell and the cover assembly 100 in the above embodiment, the battery cell is located in the shell 200, the cover assembly 100 is used to close the shell 200, and the electrode ear 210 of the battery cell passes through the first gap 135 and is connected to the lead-out plate 130 in the first through hole 113 and / or the installation cavity 144, thereby effectively improving the volume energy density of the battery.

[0115] It should be noted that the battery cells and shell 200 used in the battery can be structures well known to those skilled in the art, and the structure and use principle of the cover assembly 100 are described in detail in the above embodiments, and will not be repeated in this embodiment.

[0116] The present application also provides a battery pack comprising the battery of the aforementioned embodiment. Multiple batteries can be connected in series or in parallel to meet the needs of different scenarios. Of course, when multiple batteries are integrated into a battery pack, the battery pack's connecting tab can be connected to the end of the conductive member 120 extending outside the cover body 111 to achieve series or parallel connection of the batteries.

[0117] An embodiment of the present application further provides an electrical device, comprising an electrical device and the battery or battery pack in the above embodiment, wherein the battery or battery pack is used to supply power to the electrical device.

[0118] It should be noted that electrical equipment includes, but is not limited to, vehicles and other energy storage devices. For example, a vehicle can be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and a new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Accordingly, the electrical components can be the vehicle's drive mechanism or control system. Energy storage devices can include mobile phones, portable devices, laptops, electric toys, power tools, ships, and spacecraft, among others. Spacecraft can include aircraft, rockets, space shuttles, or spacecraft.

[0119] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0120] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A cover plate assembly (100), characterized in that: include: A cover plate body (110), wherein the cover plate body (110) is provided with a first through hole (113) penetrating the cover plate body (110) along a thickness direction of the cover plate body (110); a conductive member (120), the conductive member (120) being located on one side of the first through hole (113) and penetrating the cover plate body (110) along a thickness direction of the cover plate body (110); a cap component (140), the cap component (140) being provided on a first end in a thickness direction of the cover plate assembly (100) and being used to close the first through hole (113); a lead-out piece (130), the lead-out piece (130) being connected to the conductive member (120), and the lead-out piece (130) being located at a second end in a thickness direction of the cover plate body (110), and the lead-out piece (130) partially extending to the first through hole (113) to form a first connecting portion (131); The first connecting portion (131) is at least partially used to connect with a tab extending into the first through hole (113) and / or a tab portion at one end of the first through hole (113) facing away from the first connecting portion (131).

2. The cover plate assembly (100) according to claim 1, characterized in that: The lead-out piece (130) is connected to the cover plate body (110) at least at one end of the first through hole (113) facing away from the cap component (140).

3. The cover plate assembly (100) according to claim 2, characterized in that: The cover plate body (110) comprises a cover plate body (111) and a first insulating member (112), wherein opposite sides of the first insulating member (112) are in contact with the cover plate body (111) and the lead-out piece (130) respectively, and separate the cover plate body (111) and the lead-out piece (130); The cover plate body (111) and the first insulating member (112) are respectively provided with a coaxial first connecting hole (1131) and a second connecting hole (1132), and the first through hole (113) includes the first connecting hole (1131) and the second connecting hole (1132).

4. The cover plate assembly (100) according to claim 3, characterized in that: The lead-out piece (130), the first insulating member (112), and the cover plate body (111) are riveted together at least on a side of the first through hole (113) facing away from the conductive member (120) by means of rivets (133).

5. The cover plate assembly (100) according to claim 4, characterized in that: A coaxial second through hole (1111) is provided on the lead-out piece (130), the first insulating piece (112) and the cover body (111); the rivet (133) passes through the cover body (111), the first insulating piece (112) and the second through hole (1111) on the lead-out piece (130) in sequence; The lead-out piece (130) is provided with a first mounting groove (132) connected to the second through hole (1111) on the side facing away from the first insulating member (112), and connecting flanges (134) are provided at both ends of the rivet (133). One of the two connecting flanges (134) abuts against the side of the cover body (111) facing away from the first insulating member (112), and the other is located in the first mounting groove (132) and abuts against the bottom of the first mounting groove (132).

6. The cover plate assembly (100) according to claim 5, characterized in that: The connecting flange (134) abutting against the cover plate body (111) is located between the cap component (140) and the cover plate body (111).

7. The cover plate assembly (100) according to claim 3, characterized in that The cap component (140) comprises: a cap body (141), the cap body (141) being connected to the cover plate body (111) and enclosing the cap body (141) with the cover plate body (111) to form a mounting cavity (144); a second insulating member (143), the second insulating member (143) being located in the mounting cavity (144) and connected to the cap body (141); The second insulating member (143) at least partially passes through the first connecting hole (1131) and extends into the second connecting hole (1132), and the second insulating member (143) is used to separate the tab (210) from the cover plate body (111) and the cap body (141).

8. The cover plate assembly (100) according to claim 7, characterized in that: The cap component (140) further includes an explosion-proof valve (142), which is provided on the cap body (141). The explosion-proof valve (142) is configured to relieve pressure in the installation cavity (144) when the pressure in the installation cavity reaches a preset value.

9. The cover plate assembly (100) according to claim 7, characterized in that: The inner diameter of the first connecting hole (1131) is greater than the inner diameter of the second connecting hole (1132), and the first insulating member (112) partially extends into the first connecting hole (1131).

10. The cover plate assembly (100) according to any one of claims 3 to 9, characterized in that: The invention also includes a fourth insulating member (180) and a second sealing member (190) which are sleeved on the conductive member (120), wherein the conductive member (120) presses the fourth insulating member (180) against the cover body (111), and the second sealing member (190) is partially located between the cover body (110) and the conductive member (120) to close the gap between the conductive member (120) and the cover body (110).

11. The cover plate assembly (100) according to claim 10, characterized in that: The conductive member (120) comprises a second electrode column (124) and a lead terminal (123) riveted to the second electrode column (124); the second electrode column (124) passes through the lead terminal (123), the fourth insulating member (180), and the second sealing member (190) in sequence, and is riveted to the lead sheet (130); A second mounting groove (181) is provided on the side of the fourth insulating member (180) facing away from the second sealing member (190), and the lead terminal (123) is at least partially inserted into the second mounting groove (181). A third mounting groove (1112) is provided on the side of the cover plate body (111) facing away from the first insulating member (112), and the fourth insulating member (180) is at least partially inserted into the third mounting groove (1112).

12. The cover plate assembly (100) according to any one of claims 3 to 9, characterized in that: The cover plate further comprises a third insulating member (150), a first sealing member (170) and a fixing ring (160), wherein the third insulating member (150) and the first sealing member (170) are both sleeved on the outside of the conductive member (120), and the first sealing member (170) is located between the third insulating member (150) and the cover plate body (110), and the fixing ring (160) is sleeved on the outside of the first sealing member (170); The cover plate body (111) is provided with a first stepped hole (1113) for the conductive member (120) to pass through, the first stepped hole (1113) having a second stepped surface, one end of the fixing ring (160) is located outside the first stepped hole (1113) and abuts against the third insulating member (150), and the other end of the fixing ring (160) extends into the first stepped hole (1113) and abuts against the second stepped surface; The first insulating member (112) and the first sealing member (170) both extend at least partially into the first stepped hole (1113) to separate the cover plate body (110) and the conductive member (120); the first sealing member (170) is used to close the gap between the conductive member (120) and the third insulating member (150); and the first sealing member (170) is also used to close the gap between the conductive member (120) and the first insulating member (112).

13. The cover plate assembly (100) according to claim 12, characterized in that: The conductive member (120) comprises a first electrode column (122) and a conductive cap (121); the first electrode column (122) sequentially passes through the third insulating member (150), the first sealing member (170), and the cover plate body (110) and is connected to the lead-out piece (130); the conductive cap (121) is located at an end of the first electrode column (122) away from the lead-out piece (130); A connecting platform (1221) is provided at one end of the first electrode column (122) adjacent to the conductive cap (121), and the connecting platform (1221) abuts against an end of the third insulating member (150) facing away from the first sealing member (170).

14. A battery, characterized in that: The invention comprises a shell (200), a battery cell and a cover plate assembly (100) according to any one of claims 1 to 13, wherein the battery cell is located in the shell (200), the cover plate assembly (100) is used to close the shell (200), and the tab (210) of the battery cell is connected to a lead-out plate (130).

15. A battery pack, characterized in that: Including the battery according to claim 14.

16. An electrical device, characterized in that: It comprises an electrical device, and the battery according to claim 14 or the battery pack according to claim 15, wherein the battery or the battery pack is used to power the electrical device.

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