Collecting plate, cover plate assembly, battery, battery assembly and electric equipment

Abstract

The utility model discloses a collector plate, a cover plate assembly, a battery, a battery assembly and electric equipment, the collector plate comprises a body and a protruding part, the protruding part protrudes out of the body and forms a first accommodating cavity, and the first accommodating cavity can accommodate electrolyte, so that the capacity of the electrolyte in the battery is increased, and the cycle use frequency of the battery is increased.

Description

Technical Field

[0001] This application relates to the field of manifolds, and more specifically, to a manifold, a cover assembly, a battery, a battery assembly, and an electrical device. Background Technology

[0002] With the widespread use of batteries in the new energy field, increasing the battery cycle life has become a key factor in improving battery utilization. One crucial factor in the battery cycle life is the electrolyte capacity. To maximize battery capacity, as many positive and negative electrodes as possible are needed. However, the presence of positive and negative electrodes reduces the electrolyte capacity, which in turn decreases the battery's cycle life. Utility Model Content

[0003] To address at least one problem existing in the prior art, this application provides a manifold, a cover plate assembly, a battery, a battery assembly, and an electrical device.

[0004] This application provides a data collection disk, including:

[0005] The body is designed for electrical connection with the battery cell;

[0006] A protrusion protrudes from the body; the protrusion includes a first peripheral sidewall and a convex top, one end of the first peripheral sidewall is connected to the body, and the other end of the first peripheral sidewall is connected to the convex top;

[0007] The first peripheral sidewall and the convex top form a first receiving cavity; the first receiving cavity is adapted to contain electrolyte.

[0008] In some embodiments, the convex top has an opening that extends through the convex top in the thickness direction and communicates with the first receiving cavity.

[0009] In some embodiments, the protrusion protrudes from the body in a first direction; at least a portion of the top of the protrusion is recessed toward the body to form an injection portion, the injection portion having a second receiving cavity, and the end of the injection portion away from the body being connected to the top of the protrusion;

[0010] The opening is located in the injection section, and the opening connects the second receiving cavity and the first receiving cavity.

[0011] In some embodiments, the convex top includes a flat portion and the injection portion, the injection portion being recessed relative to the flat portion toward the body, the injection portion including a second peripheral sidewall and a recessed bottom; one end of the second peripheral sidewall away from the body is connected to the flat portion, and the other end of the second peripheral sidewall is connected to the recessed bottom, the second peripheral sidewall and the recessed bottom forming the second receiving cavity;

[0012] In the direction from the central axis of the protrusion toward the circumferential edge of the protrusion, at least a portion of the second circumferential sidewall and the first circumferential sidewall are spaced apart.

[0013] In some embodiments, the opening is located at the bottom of the recess and extends through the bottom of the recess in the thickness direction, so that the second receiving cavity and the first receiving cavity are in communication.

[0014] In some embodiments, the orthographic projection of the opening lies within the orthographic projection of the concave bottom in a direction perpendicular to the thickness of the body.

[0015] In some embodiments, the dimension of the straight portion is greater than or equal to 1.5 mm in the direction from the axis of the convex top to its circumferential edge.

[0016] In some embodiments, the height of the second peripheral sidewall is less than the height of the first peripheral sidewall in the direction of the body thickness.

[0017] In some embodiments, the protrusion is provided with at least one first limiting portion, which is adapted to limit the protrusion.

[0018] In some embodiments, the protrusion includes a first peripheral sidewall and a convex top, the first peripheral sidewall and the convex top forming the first receiving cavity; one end of the first peripheral sidewall is connected to the body, and the other end of the first peripheral sidewall is connected to the convex top.

[0019] At least a portion of the first peripheral sidewall is recessed toward the central axis of the protrusion to form the first limiting portion.

[0020] In some embodiments, the protrusion protrudes from the body in a first direction, and the dimension of the first limiting portion in the first direction is equal to the dimension of the first peripheral sidewall in the first direction.

[0021] In some embodiments, there are multiple first limiting portions, and the multiple first limiting portions are spaced apart along the circumferential direction of the protrusion.

[0022] In some embodiments, the protrusion protrudes from the body along a first direction; the protrusion includes a first peripheral sidewall and a convex top, at least a portion of the convex top is recessed toward the body to form an injection portion, and at least a portion of the first limiting portion and the injection portion are spaced apart in the direction from the central axis of the protrusion toward the circumferential edge of the protrusion.

[0023] In some embodiments, the body includes a connecting portion that protrudes from the body in a direction away from the protrusion, and the connecting portion is adapted to be electrically connected to the battery cell.

[0024] In some embodiments, the body is provided with at least one flow-limiting hole that penetrates the body in the thickness direction.

[0025] In some embodiments, there are multiple flow-limiting holes, and at least some of the flow-limiting holes are arranged circumferentially around the protrusion.

[0026] In some embodiments, along the direction from the central axis of the body to its circumferential edge, the minimum distance from the circumferential edge of the end of the protrusion connected to the body to the side of the flow-limiting hole near the protrusion is greater than or equal to 1 mm.

[0027] This application also provides a cover plate assembly, including the manifold provided in this application and a cover plate, wherein the protrusion is adapted to connect with the cover plate.

[0028] In some embodiments, the cover plate has a through hole, and the protrusion passes through the through hole to make the protrusion suitable for electrical connection with an external circuit.

[0029] In some embodiments, a sealing ring is also included, the protrusion passing through the sealing ring and the through hole, the sealing ring abutting between the cover plate and the body.

[0030] In some embodiments, the cover assembly further includes a sealing component adapted to seal the opening.

[0031] In some embodiments, the sealing assembly includes a seal that passes through the opening and is at least partially disposed in the second receiving cavity.

[0032] In some embodiments, the sealing assembly further includes a sealing cap that covers the opening and is adapted to be welded to the protrusion and / or the cover plate to seal the opening.

[0033] In some embodiments, the cover plate further includes an insulating element, and the cover plate includes a first surface and a second surface opposite to each other in its thickness direction, the second surface being disposed opposite to the body;

[0034] The insulating element is disposed on the inner wall of the through hole; and / or

[0035] The insulating element is disposed on the first surface and located around the through hole; and / or

[0036] The insulating element is disposed on the second surface to insulate the cover plate and the manifold.

[0037] In some embodiments, the inner wall of the through hole is provided with a second limiting part, and the protrusion is provided with a first limiting part. The second limiting part and the first limiting part are correspondingly arranged to limit the cover plate and the collector plate.

[0038] This application also provides a battery, including a cover plate assembly provided in this application, a housing and a battery cell, the housing having a receiving cavity and at least one second opening; the battery cell being housed within the receiving cavity; the cover plate assembly being connected to the second opening, and the cover plate assembly and the battery cell being electrically connected.

[0039] This application also provides a battery assembly, including the battery provided in this application.

[0040] This application also provides an electrical device, including the battery provided in this application, or the battery assembly provided in this application.

[0041] The current collector of this application includes a body and a protrusion. The protrusion includes a first peripheral sidewall and a convex top. One end of the first peripheral sidewall is fixedly connected to the body, and the other end of the first peripheral sidewall is fixedly connected to the convex top. The convex top and the first peripheral sidewall form a first receiving cavity, which is suitable for containing electrolyte. The first receiving cavity increases the volume of electrolyte contained inside the battery, thereby increasing the electrolyte content of the battery and improving the battery's cycle life.

[0042] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0043] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0044] Figure 1 This is a top view of the manifold in some embodiments of this application;

[0045] Figure 2 This is a bottom view of the manifold in some embodiments of this application;

[0046] Figure 3 This is an exploded view of the cover plate assembly according to certain embodiments of this application;

[0047] Figure 4 This is a schematic cross-sectional view of the battery structure according to certain embodiments of this application;

[0048] Figure 5 This is a partial structural diagram of the manifold in some embodiments of this application;

[0049] Figure 6This is a schematic diagram of the bottom structure of the manifold in some embodiments of this application.

[0050] Explanation of key component symbols:

[0051] 10-Collector disk;

[0052] 100 - Body; 110 - Connecting part; 120 - Flow limiting orifice; 130 - Flow passage;

[0053] 200 - Protrusion; 201 - First receiving cavity; 2100 - Protruding top; 210 - Straight part; 220 - First peripheral sidewall; 230 - Injection part; 231 - Opening; 232 - Concave bottom; 233 - Second peripheral sidewall; 240 - First limiting member;

[0054] 1000-Cover assembly; 20-Sealing ring; 30-Cover; 60-Sealing assembly; 40-Sealing element; 50-Sealing cover; 310-Insulating element; 320-Second limiting element; 2000-Battery; 2001-Cell; 2002-Casing. Detailed Implementation

[0055] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of this application, and should not be construed as limiting the embodiments of this application.

[0056] With the widespread use of batteries in the new energy field, increasing the battery cycle life has become a key factor in improving battery utilization. One crucial factor in the battery cycle life is the electrolyte capacity. To maximize battery capacity, as many positive and negative electrodes as possible are needed. However, these electrodes compress the electrolyte volume, reducing the electrolyte capacity and thus decreasing the battery's cycle life.

[0057] To address the aforementioned issues, this patent proposes a current collector, comprising a body and a protrusion. The body is adapted for electrical connection with a battery cell, and the protrusion extends beyond the body to form a first receiving cavity, which is adapted to contain electrolyte. By providing the protrusion and forming the first receiving cavity, the capacity of the electrolyte within the battery is increased, thereby extending the battery's cycle life.

[0058] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0059] Please see Figures 1-2In some embodiments, the current collector 10 includes a body 100 and a protrusion 200. The body 100 is adapted to be electrically connected to the battery cell. The protrusion 200 protrudes from the body 100 and has a first receiving cavity 201 adapted to contain electrolyte. Because the first receiving cavity 201 can contain electrolyte, the volume of electrolyte in the battery is increased, thereby improving the cycle life of the battery.

[0060] In some embodiments, the protrusion 200 includes a first peripheral sidewall 220 and a convex top 2100. One end of the first peripheral sidewall 220 is fixedly connected to the body 100, and the other end of the first peripheral sidewall 220 is fixedly connected to the convex top 2100. The convex top 2100 and the first peripheral sidewall 220 form a first receiving cavity 201, which is adapted to contain electrolyte. The first receiving cavity 201 formed by the convex top 2100 and the first peripheral sidewall 220 increases the volume of electrolyte contained inside the battery, thereby increasing the electrolyte content and improving the battery's lifespan. At the same time, the convex top 2100 is adapted to be electrically connected to external devices, thereby allowing the convex top 2100 to act as an electrode post, further simplifying the battery design and assembly process.

[0061] It should be noted that, in some embodiments, references Figure 1 The first peripheral sidewall 220 is a cylindrical wall surface, and the convex top 2100 is fixedly connected to the side of the first peripheral sidewall 220 away from the body 210. The convex top 2100 is a circular top. In other possible embodiments, the first peripheral sidewall 220 may also be dome-shaped, that is, the first peripheral sidewall is an arc surface, or the first peripheral sidewall 220 may also be a conical surface; in some embodiments, the cross-sectional shape of the first peripheral sidewall 220 perpendicular to the first direction X may also be square or rectangular, in which case the convex top 2100 also corresponds to a square or rectangular top. No specific limitations are made on the specific forms of the first peripheral sidewall 220 and the convex top 220; both the first peripheral sidewall 220 and the convex top 2100 that can form the first receiving cavity 201 are within the protection scope of this application.

[0062] In some embodiments, the battery filling port can also be offset, that is, the filling port is not located on the protrusion 200. In this case, the protrusion 200 can serve as a terminal post, and the top of the protrusion 2100 can be electrically connected to an external device. In this case, a separate filling port needs to be opened on the cover plate, and the filling port is sealed with a sealing component 60.

[0063] In some embodiments, an opening 231 can be made in the convex top 2100, and electrolyte can be injected into the battery through the opening 231. The opening can be sealed by the sealing component 60, which can also realize the injection of electrolyte and the sealing of the opening 231. In this case, the convex top 2100 not only realizes the function of the electrode post, but can also be used to inject electrolyte into the battery, thus optimizing the battery structure.

[0064] In some embodiments, to improve the sealing performance of the opening 231, the convex top 2100 is provided with an injection portion 230. The convex top 2100 is recessed in the direction toward the body 100 to form the injection portion 230. The injection portion 230 has a second receiving cavity. The end of the injection portion 230 away from the body 100 is connected to the convex top 2100. The opening 231 is located in the injection portion 230 and connects the second receiving cavity and the first receiving cavity 201. At least a portion of the sealing component 60 is disposed in the second receiving cavity, which can limit the sealing component 60 and improve the sealing performance and reliability of the sealing component 60.

[0065] The convex top 2100 is recessed in the direction of the body 100 to form the liquid injection part 230. The convex top 2100 includes a flat part 210 and the liquid injection part 230. The flat part 210 is adapted to be electrically connected to an external circuit, thereby acting as a pole.

[0066] refer to Figures 1-3 An opening 231 is provided in the injection section 230, and a sealing element 40 is provided in the injection section 230 and seals the opening 231. By welding the sealing cover 50 and the straight section 210, the sealing performance of the sealing element 40 to the opening 231 is improved.

[0067] Furthermore, in some embodiments, the electrolyte injection portion 230 includes a second peripheral sidewall 233 and a recessed bottom 232. One end of the second peripheral sidewall 233 away from the body 100 is fixedly connected to the straight portion 210, and the other end of the second peripheral sidewall 233 near the body 100 is connected to the recessed bottom 232. The second peripheral sidewall 233 and the recessed bottom 232 form a second receiving cavity. In the direction from the central axis of the protrusion 200 toward the circumferential edge of the protrusion 200, at least a portion of the second peripheral sidewall 233 and the first peripheral sidewall 220 are spaced apart. The gap between the second peripheral sidewall 233 and the first peripheral sidewall 220 can be used to accommodate electrolyte, increasing the capacity of the electrolyte and thus improving the cycle life of the battery.

[0068] In some embodiments, the opening 231 is disposed at the concave bottom 232. In this case, the seal 40 seals the opening 231 by penetrating the concave bottom 232. That is, the seal 40 is at least partially disposed in the second receiving cavity. The second receiving cavity limits the seal 40 in the thickness direction of the body 100, thereby further improving the sealing performance of the opening 231.

[0069] It should be noted that in some embodiments, the orthographic projection of the opening 231 on the projection plane perpendicular to the first direction X is located within the orthographic projection of the concave bottom 232 on the projection plane. That is, on the plane perpendicular to the first direction X, the cross-sectional area of ​​the opening is smaller than the cross-sectional area of ​​the concave bottom 232. In this case, the concave bottom 232 can support the sealing member 40. That is, the concave bottom 232 limits the sealing member 40 in the first direction, so that the sealing member 40 can better seal the opening 231.

[0070] The first direction X usually refers to the thickness direction of the body 100. The first direction X can also refer to other directions that are at an angle to the thickness direction of the body 100.

[0071] In some embodiments, the height of the first peripheral sidewall 220 in the first direction X is less than the height of the second peripheral sidewall 233 in the first direction X. In order to store more electrolyte, the volume of the first receiving cavity 201 formed by the protrusion 200 of the current collector 10 of this application is equal to the volume of the protrusion 200 minus the volume of the second receiving cavity. Therefore, the smaller the volume of the liquid injection part 230, the more electrolyte the protrusion 200 can hold. Under the condition that the seal 40 can be accommodated by the second receiving cavity, the smaller the volume of the liquid injection part 230, the more electrolyte it can hold. Therefore, the height of the second peripheral sidewall 233 is less than the height of the first peripheral sidewall 220. This not only allows the protrusion 200 to hold more electrolyte, but also, since the current collector 10 is mounted on the cell, the height of the second peripheral sidewall 233 being less than the height of the first peripheral sidewall 220 can prevent the concave bottom 232 from contacting the cell, thus improving the safety performance of the battery.

[0072] In some embodiments, the liquid injection portion 230 has a circular cross-sectional shape perpendicular to the first direction X, as shown in the reference. Figures 1-3 At this time, the cross-sectional shape of the straight portion 210 perpendicular to the first direction X is also circular. The cross-section of the injection portion 230 perpendicular to the first direction X can correspond to the cross-section of the straight portion 210 perpendicular to the first direction X. Because the injection portion 230 is provided on the convex top 2100, the cross-section of the straight portion 210 perpendicular to the first direction X is annular. Sufficient area needs to be reserved on the straight portion 210 for welding with the sealing cap 50.

[0073] In some embodiments, reference Figure 6The sealing cap 50 and the straight portion 210 are welded by laser welding around the circumference of the injection portion 230. To avoid incomplete welding, the minimum width W1 of the straight portion 210, from its central axis to its circumferential edge, needs to be greater than or equal to 1.5 mm. It should be noted that the straight portion 300 here refers to the portion radiating from the central axis to the circumferential edge, and its dimension is 1.5 mm. The cross-sections of the straight portion 210 and the injection portion 230 perpendicular to the first direction X can be of any shape. The cross-sectional areas of the straight portion 210 and the injection portion 230 perpendicular to the first direction X can be of different shapes, as long as the dimension of the straight portion 210 from its central axis to its circumferential edge is not less than 1.5 mm, the welding of the straight portion 210 and the sealing cap 50 can be achieved, realizing the electrical connection between the manifold 10 and the external device.

[0074] In some embodiments, reference Figures 1-3 The collector plate 10 will also have a first limiting part 240 on the protrusion 200 and a second limiting part 320 on the cover plate 30. Through the limiting of the first limiting part 240 and the second limiting part 320, the cover plate 30 and the collector plate 10 are limited by mechanical fixation, and the collector plate 10 and the cover plate 30 are fixedly connected and will not move relative to each other.

[0075] It should be noted that if the cross-sectional shape of the protrusion 200 perpendicular to the first direction X is at least partially square, or other angular shapes such as rectangles or rhombuses, then the through hole 330 on the cover plate 30 and the protrusion 200 are correspondingly provided. The protrusion 200 and the through hole 330 can achieve circumferential limiting by their own shapes. At this time, there is no need to set the first limiting part 240 and the second limiting part 320 for limiting.

[0076] In some embodiments, multiple first limiting parts 240 are provided, and multiple corresponding second limiting parts 320 are also provided. Providing multiple parts can improve the limiting effect.

[0077] In some embodiments, the first limiting portion 240 may be spaced apart in the circumferential direction of the protrusion 200 to make the limiting of the collector plate 100 and the cover plate 30 more stable.

[0078] In some embodiments, the first limiting portion 240 can be formed by recessing the first peripheral sidewall 220 from the circumferential edge of the protrusion toward the central axis of the protrusion. In this case, the processing method of the first limiting portion 240 is simple and the production cost is low.

[0079] refer to Figures 1-3 In the first direction X, the height of the first limiting part 240 is equal to the height of the first peripheral sidewall 220. At this time, the protrusion is easier to pass through the through hole, so that the assembly of the cover plate 30 and the collector plate 10 is more convenient.

[0080] It should be noted that the first limiting part 240 and the liquid injection part 230 need to be spaced apart in the direction from the central axis of the protrusion 230 toward the circumferential edge. The spaced arrangement of the liquid injection part 230 and the first limiting part 240 can increase the volume of the first accommodating cavity, thereby increasing the capacity of the electrolyte in the battery, increasing the number of battery cycles, and increasing the battery's service life.

[0081] In some embodiments, a flow-limiting hole 120 is also provided on the body 100, and the flow-limiting hole 120 penetrates the body 100 in the thickness direction.

[0082] refer to Figure 1 and Figure 2 During battery use, if thermal runaway or other malfunctions occur inside the battery, the instantaneous current of the battery often increases. In this case, it is necessary to disconnect the electrical connection between the battery and external devices to prevent damage to the external devices. In existing technology, a fuse is usually set to connect the terminal and the current collector separately. When a large instantaneous current passes through the current collector, the fuse will melt, thereby disconnecting the electrical connection between the current collector and the terminal.

[0083] The current collector 10 provided in this application has a main body 100 and a protrusion 200 electrically connected. The current on the main body 100 flows to an external device through the protrusion 200. A current limiting hole 120 is provided on the main body 100 and arranged circumferentially around the protrusion 200. In the circumferential direction of the current limiting hole 120, the main body 100 also includes a current-passing part 130. By providing the current limiting hole 120, the current-passing area of ​​the current-passing part 130 is reduced. That is, by setting the area of ​​the current limiting hole 120, the current-passing area of ​​the current-passing part 130 is made to meet the current limiting requirements of the battery. When the instantaneous current of the connection part 110 on the main body 100 is too large, the current-passing part 130 will melt due to overheating caused by the instantaneous large current. The protrusion 200 and the connection part 110 are disconnected, which improves the reliability of the battery.

[0084] In some embodiments, the body 100 includes a connector 110 projecting away from the protrusion 200, the connector 110 being adapted to be electrically connected to the battery cell, thereby electrically connecting the current collector and the battery cell, and realizing the electrical connection between the battery cell and external devices through the current collector 10. In some embodiments, reference is made to... Figures 1-5 There are multiple current limiting holes 120, which are arranged circumferentially around the protrusion 200. There is an overcurrent portion 130 between two adjacent current limiting holes 120. When the instantaneous current on the body 100 is too large, the overcurrent portion 130 is melted, and the electrical connection between the protrusion 200 and the connecting portion 110 is disconnected, thus disconnecting the electrical connection between the external device and the battery and improving the reliability of the battery.

[0085] It should be noted that, in some embodiments, references Figure 5In the direction from the central axis of the body 100 to the circumferential edge, the minimum distance L1 between the side of the flow-limiting hole 120 near the protrusion 200 and the end of the protrusion 200 connected to the collector plate must be greater than or equal to 1.0 mm, so as to facilitate the integral stamping of the flow-limiting hole 120 and the protrusion 200. It should be noted that the connecting part 110, the protrusion 200, the liquid injection part 230, the opening 231, and the first limiting part 240 provided on the collector plate 10 can all be integrally stamped, thereby eliminating the production of the electrode post and the welding process between the electrode post and the collector plate, and also eliminating the fuse, making the collector plate of this application not only easier to produce, but also reducing production costs.

[0086] This application also provides a cover plate assembly 1000, which includes a manifold 10 and a cover plate 30 provided in this application, and the cover plate 30 is connected to a protrusion 200.

[0087] In some embodiments, the cover plate 30 is provided with a through hole 330, and the protrusion 200 passes through the through hole 330 to connect the cover plate 30 and the collector plate 10.

[0088] In some embodiments, the cover plate assembly 1000 also includes a sealing ring 20. Since assembly gaps may occur during the assembly of the collector plate 10 and the cover plate 30, the protrusion 20 passes through the sealing ring 20 and the through hole 330. The sealing ring 20 abuts between the cover plate 30 and the collector plate 10, avoiding the risk of leakage caused by assembly gaps and improving the sealing performance of the battery.

[0089] In some embodiments, the cover plate assembly 1000 has an opening, therefore the cover plate assembly includes a sealing component 60, which can seal the opening. It should be noted that the opening can be provided on the cover plate 30 or on the protrusion 200, both of which allow for electrolyte injection.

[0090] When the opening 231 is set on the cover plate 30, the convex top 2100 does not need to be set with the opening 231. At this time, the convex top 2100 also does not need to be set with the liquid injection part 230. The convex top can be directly used as an electrode to be electrically connected to the external equipment. The sealing assembly 60 includes a sealing element 40 and a sealing cover 50. After the sealing element 40 seals the opening 231 on the cover plate 30, the sealing cover 50 is used to cover the sealing element 40 and welded to the cover plate 30 to seal the opening.

[0091] In some embodiments, good sealing performance can also be achieved by directly sealing the opening 231 through the seal 40, in which case the sealing cap 50 and the cover plate 30 do not need to be welded.

[0092] When the opening 231 is located at the convex top 2100, the seal 40 closes the opening 231, and the sealing cover covers the seal 40 and is welded to the convex top 2100, thereby sealing the opening 231.

[0093] When the opening 231 is located at the recessed bottom 232, the sealing member 40 abuts against the recessed bottom 232. At this time, the sealing cover 50 and the straight part 210 are welded together. In the first direction X, the sealing cover 50 can abut against the sealing member 40, or there can be a certain gap between them. When the internal gas pressure of the battery is too high and impacts the sealing member 40, the sealing member 40 moves away from the battery cell and abuts against the sealing cover 50. Although the sealing member 40 has a certain displacement in the first direction X, it can still seal the opening well. In the actual assembly process, a small gap between the sealing cover 50 and the sealing member 40 is allowed, as long as the gap does not affect the sealing of the opening by the sealing member 40.

[0094] In some embodiments, the polarity of the cover plate 30 is opposite to that of the collector plate 10, in which case it is necessary to keep the cover plate 30 and the collector plate 10 insulated. An insulating member 310 is provided on the cover plate 30, which includes a first surface and a second surface, with the second surface opposite to the collector plate 10. The insulating member 310 can cover the inner wall of the through hole 330 and the periphery of the through hole 330 on the first surface. Furthermore, the insulating member 310 can cover the second surface. When the protrusion 200 passes through the through hole, it will abut against the insulating member 310, thus achieving insulation between the cover plate 30 and the collector plate 10.

[0095] This application also provides a battery 2000, see reference. Figure 4 The battery 2000 includes a housing 2002, a battery cell 2001, and a cover assembly 1000 provided in this application. The housing 2002 has a receiving cavity and at least one second opening. The battery cell 2001 is housed in the receiving cavity, and the cover assembly 1000 is connected to the second opening. Because the protrusion 200 of the current collector 10 in this application can store more electrolyte, the battery 2000 has a longer cycle life, thus increasing its usage time.

[0096] This application also provides a battery assembly, which includes the battery 2000 provided in this application. Because the battery 2000 provided in this application has a longer cycle life, the reliability of the electrical equipment is improved.

[0097] This application also provides an electrical device, which includes the battery 2000 or battery assembly provided in this application. Because the battery 2000 provided in this application has a longer cycle life, the reliability of the electrical device is improved.

[0098] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0099] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A current collector plate, characterized by, The application relates to a battery cell, which comprises: a body adapted to be electrically connected with a battery cell; a protruding part protruding from the body; the protruding part comprises a first circumferential side wall and a top part, one end of the first circumferential side wall is connected with the body, and the other end of the first circumferential side wall is connected with the top part; the first circumferential side wall and the top part form a first accommodating cavity adapted to accommodate electrolyte.

2. The current plate of claim 1, wherein the top part is provided with an opening penetrating the top part in the thickness direction of the top part and communicating with the first accommodating cavity.

3. The current plate of claim 2, wherein, the protruding part protrudes from the body in a first direction; at least part of the top part is recessed towards the body to form a liquid injection part, the liquid injection part has a second accommodating cavity, and one end of the liquid injection part away from the body is connected with the top part; the opening is located in the liquid injection part, and the opening communicates the second accommodating cavity with the first accommodating cavity.

4. The current plate of claim 3, wherein the top part comprises a flat part and the liquid injection part, the liquid injection part is recessed towards the body relative to the flat part, the liquid injection part comprises a second circumferential side wall and a bottom part; one end of the second circumferential side wall away from the body is connected with the flat part, the other end of the second circumferential side wall is connected with the bottom part, and the second circumferential side wall and the bottom part form the second accommodating cavity; in the direction of the central axis of the protruding part towards the circumferential edge of the protruding part, at least part of the second circumferential side wall and the first circumferential side wall are arranged at intervals.

5. The current plate of claim 4, wherein, the opening is located in the bottom part, and the opening penetrates the bottom part in the thickness direction of the bottom part to communicate the second accommodating cavity with the first accommodating cavity.

6. The current plate of claim 5, wherein, in the direction perpendicular to the thickness direction of the body, the orthographic projection of the opening is located in the orthographic projection of the bottom part.

7. The current plate of claim 4, wherein in the direction of the central axis of the top part to the circumferential edge thereof, the size of the flat part is greater than or equal to 1.5 mm.

8. The current plate of claim 4, wherein, in the thickness direction of the body, the height of the second circumferential side wall is smaller than the height of the first circumferential side wall.

9. The current plate of claim 1, wherein, the protruding part is provided with at least one first limiting part adapted to limit the protruding part.

10. The current plate of claim 9, wherein, the protruding part comprises a first circumferential side wall and a top part, the first circumferential side wall and the top part form the first accommodating cavity; one end of the first circumferential side wall is connected with the body, and the other end of the first circumferential side wall is connected with the top part, at least part of the first circumferential side wall is recessed towards the central axis of the protruding part to form the first limiting part.

11. The current plate of claim 10, wherein, the protruding part protrudes from the body in a first direction, and the size of the first limiting part in the first direction is equal to the size of the first circumferential side wall in the first direction.

12. The current plate of claim 9, wherein, there are a plurality of first limiting parts, and the plurality of first limiting parts are arranged at intervals in the circumferential direction of the protruding part.

13. The current plate of claim 9, wherein, the protruding part protrudes from the body in a first direction; the protruding part comprises a first circumferential side wall and a top part, at least part of the top part is recessed towards the body to form a liquid injection part, and in the direction of the central axis of the protruding part towards the circumferential edge of the protruding part, at least part of the first limiting part and the liquid injection part are arranged at intervals.

14. The current collector plate according to any one of claims 1 to 13, wherein The body comprises a connecting portion protruding from the body in a direction away from the protruding portion, the connecting portion being adapted to electrically connect with the battery cell.

15. The current collector plate according to any one of claims 1 to 13, wherein The body is provided with at least one flow-limiting hole penetrating the body in a thickness direction of the body.

16. The current plate of claim 15, wherein, The flow-limiting hole is provided with a plurality of flow-limiting holes, at least part of the flow-limiting holes being arranged at intervals in a circumferential direction of the protruding portion.

17. The current plate of claim 15, wherein, In a direction along a central axis of the body to a circumferential edge of the body, a minimum distance from a circumferential edge of one end of the protruding portion connected with the body to a side of the flow-limiting hole close to the protruding portion is greater than or equal to 1 mm.

18. A cover plate assembly characterized by, The current collector plate comprises: The current collector plate of any one of claims 1-17, and The cover plate, the protruding portion being adapted to connect with the cover plate.

19. The cover plate assembly of claim 18, wherein, The cover plate is provided with a through hole, the protruding portion penetrating the through hole so that the protruding portion is adapted to electrically connect with an external circuit.

20. The cover plate assembly of claim 19, wherein, Further comprising a sealing ring, the protruding portion penetrating the sealing ring and the through hole, the sealing ring abutting between the cover plate and the body.

21. The cover plate assembly of claim 20, wherein, The current collector plate is the current collector plate of claim 3, the cover plate assembly further comprising a sealing assembly, the sealing assembly being adapted to seal the opening.

22. The cover plate assembly of claim 21, wherein, The current collector plate is the current collector plate of claim 4, the sealing assembly comprising a sealing member, the sealing member penetrating the opening and being at least partially arranged in the second accommodating cavity.

23. The cover plate assembly of claim 21 or 22, wherein, The sealing assembly further comprises a sealing cover, the sealing cover covering the opening and being adapted to be welded with the protruding portion and / or the cover plate to seal the opening.

24. The cover plate assembly of claim 19, wherein, The cover plate further comprises an insulating member, the cover plate comprising a first surface and a second surface opposite to each other in a thickness direction of the cover plate, the second surface being arranged opposite to the body; The insulating member is arranged on an inner wall of the through hole; And / or The insulating member is arranged on the first surface and located at a circumferential side of the through hole; and / or The insulating member is arranged on the second surface so as to insulate the cover plate and the current collector plate.

25. The cover plate assembly of claim 19, wherein, The inner wall of the through hole is provided with a second limiting portion, the protruding portion is provided with a first limiting portion, the second limiting portion and the first limiting portion are correspondingly arranged so as to limit the cover plate and the current collector plate.

26. A battery, comprising: The battery comprises: The shell is provided with an accommodating cavity and at least one second opening; The battery cell is accommodated in the accommodating cavity; The cover plate assembly of any one of claims 18-25, the cover plate assembly being connected at the second opening, the cover plate assembly being electrically connected with the battery cell.

27. A battery assembly characterized by, The battery of claim 26.

28. An electrical device, comprising: The battery of claim 26, or the battery assembly of claim 27.

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