Cover plate assembly, battery, battery pack and electric equipment

Abstract

The utility model discloses a cover plate assembly, a battery, a battery pack and electric equipment, the cover plate assembly is suitable for being electrically connected with a battery cell, the cover plate assembly is provided with at least one liquid storage part, the liquid storage part is provided with a liquid storage part, the liquid storage part is suitable for storing electrolyte, and the liquid storage part is suitable for releasing the electrolyte. According to the battery disclosed by the invention, the liquid storage part is arranged on the cover plate assembly, and the liquid storage part suitable for storing the electrolyte is arranged on the liquid storage part, so that part of the electrolyte is stored in the liquid storage part when the electrolyte is injected. Electrolyte can be consumed in the recycling process of the battery. The electrolyte stored in the liquid storage part can be released from the liquid storage part and flows into the battery cell through the top pole piece, so that the electrolyte released from the liquid storage part infiltrates the top pole piece, and the risk of poor lithium intercalation and even lithium precipitation at the edge of the pole piece due to lack of electrolyte infiltration is reduced; and meanwhile, the supplement of electrolyte in the battery is also realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, and more particularly, to a cover plate assembly, a battery, a battery pack and an electrical equipment. BACKGROUND

[0002] With the improvement of new energy technology, batteries are widely used. Usually in client applications, under the action of gravity, the electrolyte is more concentrated in the position closer to the bottom of the battery, and the electrolyte is easy to be deficient at the top of the battery. After long-term cyclic use of the battery, the electrolyte is consumed, at this time the top of the electrode is short of electrolyte immersion, and the edge of the top of the electrode will appear poor lithium insertion and even lithium precipitation problems. CONTENT OF THE UTILITY MODEL

[0003] In order to solve at least one problem existing in the prior art, the present application provides a cover plate assembly, a battery, a battery pack and an electrical equipment.

[0004] The present application provides a cover plate assembly, which is adapted to be electrically connected with a battery cell, and is provided with at least one liquid storage part, wherein the liquid storage part is provided with a liquid storage member, the liquid storage member is adapted to store electrolyte, and the liquid storage member is adapted to release the electrolyte.

[0005] In some embodiments, the cover plate assembly comprises a cover plate and the liquid storage member, the cover plate is adapted to be electrically connected with the battery cell, the cover plate is provided with at least one liquid storage part, and the liquid storage member is arranged in the liquid storage part.

[0006] In some embodiments, the cover plate assembly comprises a cover plate and a current collecting disc connected with the cover plate, the current collecting disc is adapted to be electrically connected with the battery cell, the current collecting disc is provided with at least one liquid storage part, and the liquid storage member is arranged in the liquid storage part.

[0007] In some embodiments, the current collecting disc comprises a body, the body comprises a first surface and a second surface opposite to each other in a first direction, and the first surface and / or the second surface comprises at least one liquid storage part.

[0008] In some embodiments, the first surface comprises at least one first liquid storage part, the first surface is provided with a first connecting part, the first connecting part protrudes from the first surface in the first direction, and the size of the liquid storage member in the first direction is less than or equal to the size of the first connecting part in the first direction; and / or

[0009] the second surface comprises at least one second liquid storage part, the second surface is provided with a second connecting part, the second connecting part protrudes from the second surface in the first direction, and the size of the liquid storage member in the first direction is less than or equal to the size of the second connecting part in the first direction.

[0010] In some embodiments, the body is provided with at least one through hole penetrating the first surface and the second surface.

[0011] In some embodiments, the liquid storage member is disposed on the surface of the body away from the cover plate.

[0012] In some embodiments, the cover plate is provided with a through hole adapted to inject electrolyte so that the electrolyte flows to the current collector.

[0013] In some embodiments, the cover plate is provided with a protrusion protruding towards the direction of the current collector, and a flow guide groove is disposed on the protrusion; the through hole and the flow guide groove are in communication.

[0014] In some embodiments, the through hole is disposed on the protrusion; the current collector is provided with at least one through hole, and the through hole and the through hole are coaxially disposed in the first direction so that the electrolyte is adapted to flow into the battery through the through hole and the through hole.

[0015] In some embodiments, the flow guide groove extends to the outer edge of the protrusion.

[0016] In some embodiments, the flow guide groove has a plurality of flow guide grooves.

[0017] In some embodiments, the projection of the flow guide groove on the projection plane perpendicular to the first direction is a combination of any straight line and / or curve.

[0018] In some embodiments, the liquid storage member includes a first liquid storage member and a second liquid storage member, the first liquid storage member is disposed on the liquid storage portion, and the second liquid storage member is disposed on the side of the first liquid storage member away from the liquid storage portion.

[0019] In some embodiments, the first liquid storage member and / or the second liquid storage member is a layered structure.

[0020] In some embodiments, the first liquid storage member and / or the second liquid storage member is a porous structure.

[0021] In some embodiments, the first liquid storage member and the second liquid storage member are both porous structures, and the porosity of the first liquid storage member is greater than or equal to the porosity of the second liquid storage member.

[0022] In some embodiments, the liquid storage member is an insulator.

[0023] The application also provides a battery, which includes a cover plate assembly provided by the application; and a shell and an electric core, the shell and the cover plate assembly are connected and jointly form a receiving cavity; the electric core is installed in the receiving cavity and electrically connected with the cover plate assembly.

[0024] In some embodiments, the battery cell is provided with a tab, the cover plate assembly comprises a cover plate and a liquid storage member, the cover plate is provided with at least one liquid storage portion, the liquid storage member is arranged in the liquid storage portion, the cover plate is adapted to be electrically connected with the tab, and the liquid storage portion is located on a side of the cover plate facing the accommodating cavity.

[0025] In some embodiments, the battery cell is provided with a tab, the cover plate assembly comprises a cover plate and a current collector plate, the current collector plate comprises a body, the body comprises a first surface and a second surface opposite to each other in a first direction, the first surface faces the battery cell, and the second surface faces the cover plate.

[0026] The first surface is provided with a first connecting portion protruding towards the battery cell, so that the first connecting portion is adapted to be electrically connected with the tab; and / or the second surface is provided with a second connecting portion protruding towards the cover plate in the first direction, so that the second connecting portion is adapted to be electrically connected with the cover plate.

[0027] In some embodiments, the cover plate is provided with a protruding portion protruding towards the current collector plate, and the second connecting portion and the protruding portion are correspondingly arranged, so that the second connecting portion is adapted to be electrically connected with the protruding portion.

[0028] The application also provides a battery pack comprising the battery as described above.

[0029] The application also provides a power consumption device comprising the battery pack and / or the battery as described above.

[0030] The battery according to the application is provided with a liquid storage portion in the cover plate assembly, and a liquid storage member adapted to store electrolyte in the liquid storage portion. When the electrolyte is injected, a part of the electrolyte is free in the shell, and a part of the electrolyte is stored in the liquid storage member. When the battery is vertically placed, the free electrolyte is consumed first in the process of circulation, and when the battery is circulated for a long time, the free electrolyte at the top of the battery is consumed and space is left for the electrolyte in the liquid storage member to seep out. Since the electrolyte itself has weight, the electrolyte stored in the liquid storage member will seep out of the liquid storage member under the action of its own gravity in the process of use of the battery, and then flow to the battery cell through the top tab. In this way, not only is the top tab soaked, reducing the risk of poor lithium insertion at the edge of the tab due to lack of electrolyte soaking, and even lithium precipitation, but also the electrolyte inside the battery is replenished.

[0031] Additional aspects and advantages of the embodiments of the application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0032] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0033] Figure 1 is a top view of a current collector plate of certain embodiments of the present application;

[0034] Figure 2 is an exploded view of a cover plate assembly of certain embodiments of the present application;

[0035] Figure 3 is a cross-sectional view of a liquid storage portion of certain embodiments of the present application;

[0036] Figure 4 is an exploded view of a cover plate assembly of certain embodiments of the present application;

[0037] Figure 5 is an exploded view of a cover plate assembly of certain embodiments of the present application;

[0038] Figure 6 is a cross-sectional view of a battery of certain embodiments of the present application;

[0039] Figure 7 is a top view of a current collector plate of certain embodiments of the present application;

[0040] Figure 8 is a schematic view of a cover plate assembly of certain embodiments of the present application.

[0041] Explanation of Main Element Symbols:

[0042] 1 - current collector plate; 11 - body; 111 - first surface; 1111 - first connecting portion; 1113 - first liquid storage portion; 113 - second surface; 1131 - second connecting portion; 1132 - second liquid storage portion; 103 - through hole; 2 - cover plate; 201 - first protruding portion; 202 - first flow guide groove; 203 - via hole; 301 - second protruding portion; 302 - second flow guide groove; 401 - third protruding portion; 402 - third flow guide groove; 403 - fourth flow guide groove; 10 - cover plate assembly; 100 - battery; 1001 - battery cell; 13 - liquid storage member; 131 - first liquid storage member; 132 - second liquid storage member; 20 - second cover plate assembly; 21 - second cover plate; 22 - third connecting portion; 23 - liquid injection hole. DETAILED DESCRIPTION

[0043] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals and letters throughout the several views denote the same or functionally similar elements. The embodiments described below are merely examples for the implementation of the present application and therefore are not to be taken in a limiting sense, for the scope of the present application is to be afforded the broadest interpretation so as to encompass all compatible technical equivalents.

[0044] With the improvement of new energy technology, batteries are widely used. In client applications, batteries have a vertical placement scenario. Under the action of gravity, the electrolyte is more concentrated in the bottom of the battery. The top of the battery is prone to electrolyte deficiency. After long-term cycle use of the battery, the electrolyte is consumed. At this time, the top of the pole piece lacks the infiltration of the electrolyte, and the edge of the top pole piece will appear poor lithium insertion and even lithium precipitation problems.

[0045] To solve the above problems, the present patent provides a cover plate assembly, which is suitable for electrical connection with the battery cell. The cover plate assembly is provided with at least one liquid storage part, and the liquid storage part is provided with a liquid storage part. The liquid storage part is suitable for storing electrolyte, and the liquid storage part is suitable for releasing the electrolyte stored therein. When the electrolyte is released, it can supplement the electrolyte inside the battery and infiltrate the top pole piece, thereby slowing down the occurrence of lithium insertion or lithium precipitation of the top pole piece.

[0046] In some embodiments, the present patent proposes a cover plate assembly 10, which is suitable for electrical connection with the battery cell. The cover plate assembly 10 includes a cover plate 2 and a current collector plate 1. The cover plate assembly 10 is provided with at least one liquid storage part, and the liquid storage part is provided with a liquid storage part 13. The liquid storage part 13 is suitable for storing electrolyte, and the liquid storage part 13 is suitable for releasing the electrolyte stored therein.

[0047] As shown in Figures 1-6 The current collector plate 1 includes a body 11 and a liquid storage part 13. At least one surface of the body 11 is provided with at least one liquid storage part. The liquid storage part 13 is arranged in the liquid storage part. The current collector plate 1 proposed by the present patent is arranged at the top of the battery. After liquid injection is completed, the inside of the battery shell will be filled with electrolyte, that is, at this time, the current collector plate and the battery cell around will be filled with free electrolyte. Since the electrolyte is flowing, the liquid stored in the liquid storage part 13 cannot flow, that is, the liquid in the liquid storage part 13 cannot overflow from the liquid storage part. During the use of the battery, the electrolyte in the shell will be gradually consumed, that is, a part of the free electrolyte between the current collector plate 1 and the battery cell 1001 will be slowly consumed during the cycle. After the electrolyte is consumed, a space appears around the current collector plate 1 and the battery cell 1001. At this time, the electrolyte in the liquid storage part 13 will penetrate downward. The top of the battery cell is generally a group of tabs. There are a lot of free electrolyte between the tabs and the tabs. At the same time, there is a lot of free electrolyte in the gap between the current collector plate and the tab. During the cycle use of the battery, the free electrolyte is consumed. The electrolyte stored in the liquid storage part 13 will be released under the action of its own gravity. The released electrolyte will infiltrate the top pole piece under the action of gravity. Thus, to a certain extent, the polarization phenomenon of the top pole piece can be slowed down, thereby slowing down the occurrence of lithium insertion or lithium precipitation of the top pole piece, and at the same time, the battery is supplemented with electrolyte.

[0048] In some embodiments, the liquid storage member 13 of the present application comprises a first liquid storage member 131 and a second liquid storage member 132; the first liquid storage member 131 is arranged in the liquid storage portion 13, and the second liquid storage member 132 is arranged on the side of the first liquid storage member 131 away from the first liquid storage portion 1113 or the second liquid storage portion 1132. Arranging two layers of liquid storage members 13 can better store the electrolyte, so that the electrolyte is not released into the battery too quickly. It should be noted that, in some embodiments, referring to Figure 3 , the first liquid storage member 131 and the second liquid storage member 132 are in a layered structure, and the first liquid storage member 131 and the second liquid storage member 132 are stacked in sequence in the first liquid storage portion 1113 or the second liquid storage portion 1132.

[0049] In some embodiments, the first liquid storage member 131 and / or the second liquid storage member 132 are both porous structures, the first liquid storage member 131 comprises a plurality of pores, and / or the second liquid storage member 132 comprises a plurality of pores. At this time, the pores of the first liquid storage member 131 and / or the second liquid storage member 132 can store more electrolyte, thereby supplying more electrolyte to the battery, and more electrolyte can soak the electrode sheets at the top of the battery, thereby better reducing the risk of lithium precipitation or lithium intercalation of the top electrode sheets and prolonging the service life of the battery.

[0050] In some embodiments, the pores of the first liquid storage member 131 are larger than the pores of the second liquid storage member 132. Referring to Figure 3 , at this time, the electrolyte in the pores of the first liquid storage member 131 will penetrate the second liquid storage member 132 more slowly, thereby allowing the electrolyte in the first liquid storage member 131 to penetrate the battery more slowly. When the battery is used for a period of time, the electrolyte inside the battery is consumed, at this time, the electrolyte in the first liquid storage member 131 penetrates into the battery through the second liquid storage member 132, which can soak the electrode sheets at the top of the battery, thereby better reducing the risk of lithium precipitation or lithium intercalation of the top electrode sheets and prolonging the service life of the battery.

[0051] Referring to Figure 3The first liquid storage member 131 has a larger aperture than the second liquid storage member 132, so that the electrolyte stored in the first liquid storage member 131 is less likely to overflow from the second liquid storage member 132, and the release rate of the electrolyte in the first liquid storage member 131 is slowed down. After the battery has been used for a period of time and the electrolyte has been consumed, the electrolyte released from the liquid storage member 13 can be used to soak the top electrode plate, thereby reducing the risk of lithium precipitation on the top electrode plate and increasing the safe use time of the battery. It should be noted that the first liquid storage member 131 and the second liquid storage member 132 are electrically non-conductive and have a large number of apertures. The materials of the first liquid storage member 131 and the second liquid storage member 132 are mainly insulating materials such as aluminum oxide, boehmite, silicon dioxide, polyvinylidene fluoride, aramid, etc. These materials have a porous structure, no side reaction with electrolyte, and good thermal stability, and can be used to absorb and store electrolyte and release electrolyte through apertures. The materials of the first liquid storage member 131 and the second liquid storage member 132 can be the same material designed to have different aperture sizes, or different materials, which will not be described in detail here.

[0052] In some embodiments, the current collector 1 comprises a body 11 and a liquid storage member 13; the body 11 has a first surface 111 and a second surface 113 opposite to each other.

[0053] In some embodiments, the current collector 1 comprises a body 11 and a liquid storage member 13; the body 11 has a first surface 111 and a second surface 113 opposite to each other. Figure 1 , Figure 1 The first surface 111 is shown in a top view, and the first liquid storage portion 1113 is arranged on the first surface 111. There can be multiple first liquid storage portions 1113 on the first surface 111, and the liquid storage member 13 is arranged on the first liquid storage portion 1113.

[0054] In some embodiments, the current collector 1 comprises a body 11 and a liquid storage member 13; the body 11 has a first surface 111 and a second surface 113 opposite to each other. Figure 7 , Figure 7 The second surface 113 is shown in a top view, and the second liquid storage portion 1132 can have multiple second liquid storage portions 1132 on the second surface 113, and the liquid storage member 13 is arranged on the second liquid storage portion 1132.

[0055] It should be noted that the current collector 1 can be arranged with the liquid storage member 13 on both the first surface and the second surface, or only one of the surfaces can be arranged with the liquid storage member 13.

[0056] In some embodiments, the current collector 1 comprises a body 11 and a liquid storage member 13; the body 11 has a first surface 111 and a second surface 113 opposite to each other. Figure 1 or Figure 7 The body 11 is further provided with a plurality of through holes 103 penetrating the first surface 111 and the second surface 113, and the through holes are adapted to allow the electrolyte to flow from one surface through the through holes 103 under the action of gravity, so that the electrolyte can be absorbed by the liquid storage member 13 of the other surface.

[0057] It should be noted that the liquid storage member 13 can be arranged on the first liquid storage portion 1113 and the second liquid storage portion 1132 by painting, i.e. in the implementation process, the material of the first liquid storage member 131 can be painted on the first liquid storage portion 1113 and / or the second liquid storage portion 1132, and then the material of the second liquid storage member 132 can be painted on the first liquid storage member 131. In some embodiments, the liquid storage member 13 can also be fixed on the first liquid storage portion 1113 and / or the second liquid storage portion 1132 by other methods such as bonding, which is not limited herein.

[0058] In some embodiments, the liquid storage member 13 only includes the first liquid storage member 131 or the second liquid storage member 132, and the first liquid storage member 131 or the second liquid storage member 132 can still achieve the purpose of storing electrolyte, and cost is saved.

[0059] Please refer to Figure 1 , the liquid storage member 13 completely covers the first liquid storage portion 1113. In some embodiments, the liquid storage member 13 only covers part of the liquid storage portion 1113, at this time the stored electrolyte is reduced, but the purpose of storing electrolyte can still be achieved, and the cost of the liquid storage member 13 can be saved. Appropriately reducing the liquid storage member 13 can also avoid the electrical connection between the first connecting portion 1111 and the tab being interfered by the liquid storage member 13.

[0060] Please refer to Figure 1 and Figure 7 , the first surface 111 is further provided with the first connecting portion 1111, and the first connecting portion 1111 protrudes from the first surface 111 along the first direction. The second surface 113 is further provided with the second connecting portion 1131, and the second connecting portion 1131 protrudes from the second surface 113 along the first direction. That is, the first connecting portion 1111 and the second connecting portion 1131 protrude from the body 11 in opposite directions. Please refer to Figure 3The second connecting portion 1131 protrudes towards the cover plate, so as to facilitate welding of the second connecting portion 1131 and the cover plate 2; and the first connecting portion 1111 protrudes towards the battery cell 1001, so as to facilitate welding with the tab on the battery cell 1001. The protruding arrangement of the first connecting portion 1111 and the second connecting portion 1131 not only makes the welding more convenient to operate, but also increases the reliability of the welding. It should be noted that the dimension of the liquid storage member 13 arranged on the first liquid storage portion 1113 along the first direction is less than or equal to the dimension of the first connecting portion 1111 protruding along the first direction. If the height of the liquid storage member 13 exceeds the height of the first connecting portion 1111, the first connecting portion 1111 cannot completely adhere to the battery cell or the tab, and at this time, the liquid storage member 13 will affect the stability of the electrical connection between the first connecting portion 1111 and the tab. Similarly, the dimension of the liquid storage member 13 arranged on the second liquid storage portion 1132 along the first direction is less than or equal to the dimension of the second connecting portion 1131 along the first direction. If the height of the liquid storage member 13 exceeds the height of the second connecting portion 1131, the second connecting portion 1131 cannot completely adhere to the cover plate 2, that is, the liquid storage member 13 will affect the stability of the electrical connection between the second connecting portion 1131 and the cover plate 2.

[0061] The application also provides a cover plate assembly 10, which comprises the current collector plate 1 and the cover plate 2.

[0062] In some embodiments, the surface of the current collector plate 1 away from the cover plate is the first surface 111, and the liquid storage member 13 is arranged only on the first surface 111. At this time, not only can the production cost of the cover plate assembly 10 be reduced, but also when the battery is placed vertically, the electrolyte in the liquid storage member 13 seeps out from the liquid storage member 13 under the action of its own gravity, and at this time, the electrolyte can directly soak the top tab, and the soaking effect of the top tab is better. Figure 6 The liquid storage member 13 is arranged on the first surface 111 of the body 11 close to the battery cell 1001, and at this time, the electrolyte in the liquid storage member 13 can directly enter the top of the battery cell 1001 after being released from the gap of the liquid storage member 13 under the action of gravity, thereby soaking the tab at the top of the battery cell 1001. It should be noted that the top of the battery cell 1001 refers to the top in the height direction of the battery. When the electrolyte in the battery is insufficient, the electrolyte will gather at the position close to the bottom of the battery under the action of gravity, and at this time, the tab at the top of the battery cell lacks the soaking of the electrolyte, is easy to be polarized, and thus has the risk of lithium intercalation or lithium precipitation. The electrolyte in the liquid storage member 13 close to the battery cell gradually flows out from the liquid storage member 13 in the battery cycle, soaks the tab at the top of the battery cell, and supplements the electrolyte in the battery, thereby reducing the risk of lithium precipitation or lithium intercalation of the tab at the top of the battery cell due to the lack of electrolyte soaking caused by a large number of cycles or a long use time.

[0063] In some embodiments, the cover plate 2 is provided with a through hole 203, and electrolyte can be injected into the current collector 1 through the through hole 203.

[0064] Further, the cover plate 2 can be provided with a first protruding part 201, which protrudes towards the current collector 1, so as to be welded with the second connecting part 1131 on the current collector 1. The first protruding part 201 is provided with a first flow guide groove 202, which is adapted to guide the electrolyte, that is, the first flow guide groove 202 and the through hole 203 are communicated, and when the electrolyte is injected into the battery through the through hole 203, part of the electrolyte will be guided to the part of the current collector 1 far away from the through hole 203 through the first flow guide groove 202. It should be noted that in some embodiments, the first protruding part 201 and the second connecting part 1131 are correspondingly arranged, so as to facilitate the electrical connection or welding of the cover plate 2 and the current collector 1.

[0065] In some embodiments, referring to Figure 2 and Figure 6 , the through hole 203 on the cover plate 2 is arranged on the first protruding part 201, the first protruding part 201 is provided with the first flow guide groove 202, and the through hole 203 and the first flow guide groove 202 are communicated. In some embodiments, the through hole 203 penetrates the flow guide groove 202 in the first direction. The body 11 includes a plurality of through holes 103, and the through hole 203 and one of the through holes 103 are coaxially arranged in the first direction, so that the electrolyte can quickly enter the battery cell 1001 through the through hole 203 and one of the through holes 103. When the first protruding part 201 and the second connecting part 1131 are welded, the electrolyte injected from the through hole 203 will not only be quickly injected into the battery cell 1001 through one of the through holes 103, but also part of the electrolyte will be guided to the part of the current collector 1 far away from the through hole 203 through the first flow guide groove 202. The electrolyte on the current collector 1 can flow into the battery cell 1001 through the plurality of through holes 103, and the electrolyte on the current collector 1 can also make the liquid storage member 13 arranged on the first surface 111 store the electrolyte when passing through the plurality of through holes 103, so as to not only speed up the injection of the electrolyte, but also make the liquid storage member 13 absorb the electrolyte more quickly and fully.

[0066] In some embodiments, the first flow guide groove 202 penetrates the first protruding part 201 in a direction perpendicular to the first direction. Referring to Figure 2 , the first flow guide groove 202 penetrates the first protruding part 201, so that the electrolyte can be guided to an area closer to the edge of the current collector, so that the electrolyte can more quickly and fully soak the battery cell far away from the through hole.

[0067] In some embodiments, referring to Figure 4, the second flow guide groove 302 only penetrates one side of the second protruding part 301, at this time, the electrolyte can flow to the corresponding side through the second flow guide groove 302, at this time, the electrolyte can also be guided to the area closer to the edge of the current collector, thereby the electrolyte can be more quickly and fully soaked into the battery cell far away from the via hole.

[0068] In some embodiments, the protruding part can be provided with multiple flow guide grooves. Please refer to Figure 5 The third flow guide groove 402 and the fourth flow guide groove 402 are provided on the third protruding part 401. The third flow guide groove 402 and the fourth flow guide groove 402 both penetrate the third protruding part 401 in the direction perpendicular to the first direction, at this time, the electrolyte can be more quickly guided to more areas closer to the edge of the current collector, thereby the electrolyte can be more quickly and fully soaked into the battery cell far away from the via hole.

[0069] In some embodiments, the projection of the first flow guide groove 202, the second flow guide groove 302, the third flow guide groove 402 and the fourth flow guide groove 402 on the projection plane perpendicular to the first direction is a combination of any straight line and / or curve, that is, the flow guide groove that can achieve flow guidance is within the protection scope of the present application, which is not limited herein.

[0070] In some embodiments, the surface of the current collector close to the cover plate is also provided with a liquid storage part 13, the electrolyte in the liquid storage part 13 can also supplement the electrolyte in the battery to some extent, this embodiment is also within the protection scope of the present application, which is not described herein.

[0071] It should be noted that the top and bottom of the present application are relative to the setting of the battery in actual use, specifically, the end far away from the ground plane is the top, and the end close to the ground plane is the bottom, that is, the current collector 1 of the present application can be arranged at the positive electrode of the battery, or can be arranged at the negative electrode of the battery, the position of the current collector 1 is determined by how the battery is placed in actual use. The purpose of the present application is that when the battery is used in cycles and the electrolyte is consumed, the electrolyte stored in the liquid storage part 13 on the current collector 1 at the top of the battery flows into the battery cell through the pores of the liquid storage part 13 under the action of gravity, thereby not only the pole piece at the top of the battery cell is soaked, but also the electrolyte in the battery is supplemented.

[0072] In some embodiments, the present application also provides a second cover plate assembly 20, the second cover plate assembly 20 comprises a second cover plate 21 and a liquid storage part 13, the second cover plate assembly 20 is adapted to be electrically connected with the battery cell, the second cover plate 21 is provided with at least one liquid storage part, and the liquid storage part 13 is arranged in the liquid storage part. In some embodiments, the battery cancels the current collector, directly welds the tab of the battery cell and the cover plate, at this time, the liquid storage part is arranged on the cover plate, and the liquid storage part 13 is arranged in the liquid storage part, the beneficial effects of the present application can still be achieved, and thus it is within the protection scope of the present application. Please refer to Figure 8The second cover plate assembly 20 includes a second cover plate 21 and a liquid storage member 13. The second cover plate 21 is provided with a liquid storage portion, and the liquid storage member 13 is arranged in the liquid storage portion. The second cover plate 21 is further provided with a third connecting portion 22, which can penetrate and be welded with the tab of the battery cell. The second cover plate 21 is further provided with a liquid injection hole 23, through which electrolyte can be injected into the battery. After the battery is injected with electrolyte, the second cover plate 21 and the battery cell are filled with electrolyte, that is, the second cover plate 21 and the battery cell are filled with free electrolyte. Since the electrolyte is flowing, the liquid stored in the liquid storage member 13 cannot flow, that is, the liquid in the liquid storage member 13 cannot overflow from the liquid storage member. During the use of the battery, the electrolyte in the shell will be gradually consumed, that is, a part of the free electrolyte between the second cover plate 21 and the battery cell will be slowly consumed during the circulation. After the free electrolyte is consumed, a space appears around the second cover plate 21. At this time, the electrolyte in the liquid storage member 13 will penetrate downward. The top of the battery cell is generally a tab group, and there is a lot of free electrolyte between the tabs. At the same time, there is a lot of free electrolyte between the second cover plate 21 and the tab. During the circulation of the battery, the free electrolyte is consumed, and a space appears around the second cover plate 21 for the electrolyte in the liquid storage member 13 to overflow. The electrolyte stored in the liquid storage member 13 will be released from the liquid storage member 13 under the action of its own gravity, and the released electrolyte will flow downward under the action of gravity, thereby wetting the top of the tab and slowing down the polarization of the top tab to a certain extent. Thus, the occurrence of lithium insertion or lithium precipitation of the top tab is slowed down, and the battery is supplemented with electrolyte. It should be noted that the second cover plate 21 can also not be provided with a liquid injection hole 23. When the battery is injected with electrolyte through other parts of the battery, the battery can also achieve the purpose of being filled with free electrolyte, which is not limited here.

[0073] In some embodiments, the battery proposed in the present application can be a cylindrical battery or a square battery, which is not limited here.

[0074] The present application also proposes a battery pack, which includes the battery proposed in the present application.

[0075] The present application also proposes a battery pack, which includes the battery proposed in the present application.

[0076] In the description of the specification, the description of the terms "certain embodiments", "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the particular feature, structure, material or characteristic being described is included in at least one embodiment or example of the application. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily intended to refer to the same embodiment or example. Moreover, the particular features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0077] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be interpreted as limiting the present application, and that variations, modifications, substitutions and changes can be made by those skilled in the art without departing from the scope of the present application, which is defined by the claims and their equivalents.

Claims

1. A cover assembly, characterized by The cover plate assembly is adapted to be electrically connected with the battery cell, and is provided with at least one liquid storage part, and the liquid storage part is provided with a liquid storage member adapted to store electrolyte and release the electrolyte.

2. The cover plate assembly of claim 1, wherein, The cover plate assembly comprises a cover plate adapted to be electrically connected with the battery cell, and at least one liquid storage part provided on the cover plate, and the liquid storage member is arranged in the liquid storage part.

3. The cover plate assembly of claim 1, wherein, The cover plate assembly comprises a cover plate and a current collector plate connected with the cover plate, the current collector plate is adapted to be electrically connected with the battery cell, and at least one liquid storage part is provided on the current collector plate, and the liquid storage member is arranged in the liquid storage part.

4. The cover plate assembly of claim 3, wherein, The current collector plate comprises a body comprising a first surface and a second surface opposite to each other in a first direction, and the first surface and / or the second surface comprises at least one liquid storage part.

5. The cover plate assembly of claim 4, wherein, The first surface comprises at least one first liquid storage part, the first surface is provided with a first connecting part protruding from the first surface in the first direction, and the size of the liquid storage member in the first direction is less than or equal to the size of the first connecting part in the first direction; and / or The second surface comprises at least one second liquid storage part, the second surface is provided with a second connecting part protruding from the second surface in the first direction, and the size of the liquid storage member in the first direction is less than or equal to the size of the second connecting part in the first direction.

6. The cover plate assembly of claim 4, wherein, The body is provided with at least one through hole penetrating through the first surface and the second surface.

7. The cover plate assembly of claim 4, wherein, The liquid storage member is arranged on the side of the body away from the cover plate.

8. The cover plate assembly of any one of claims 3-7, wherein, The cover plate is provided with a via hole adapted to inject electrolyte to flow to the current collector plate.

9. The cover plate assembly of claim 8, wherein, The cover plate is provided with a protruding part protruding towards the current collector plate, and a flow guide groove is arranged on the protruding part; The via hole and the flow guide groove are in communication.

10. The cover plate assembly of claim 9, wherein, The via hole is arranged on the protruding part, and the current collector plate is provided with at least one through hole, and the via hole and the through hole are coaxially arranged in the first direction to enable the electrolyte to flow into the battery through the via hole and the through hole.

11. The cover plate assembly of claim 9, wherein, The flow guide groove extends to the outer edge of the protruding part.

12. The cover plate assembly of claim 9, wherein, The flow guide groove has a plurality of flow guide grooves.

13. The cover plate assembly of claim 9, wherein, The projection of the flow guide groove on the projection plane perpendicular to the first direction is a combination of any straight line and / or curve.

14. The cover plate assembly of claim 1, wherein, The liquid storage member comprises a first liquid storage member and a second liquid storage member, the first liquid storage member is arranged on the liquid storage part, and the second liquid storage member is arranged on the side of the first liquid storage member away from the liquid storage part.

15. The cover plate assembly of claim 14, wherein, The first liquid storage member and / or the second liquid storage member is a layered structure.

16. The cover plate assembly of claim 14, wherein, The first liquid storage member and / or the second liquid storage member is a porous structure.

17. The cover plate assembly of claim 16, wherein, The first liquid storage member and the second liquid storage member are both porous structures, and the porosity of the first liquid storage member is greater than or equal to the porosity of the second liquid storage member.

18. The cover plate assembly of claim 1, wherein, The liquid storage member is an insulator.

19. A battery, characterized by Comprise: The cover plate assembly of any one of claims 1-18; And The shell and the cover plate assembly are connected and jointly form a receiving cavity; The battery cell is mounted in the receiving cavity and electrically connected with the cover plate assembly.

20. The battery of claim 19, wherein, The electric core is provided with a tab, and the cover plate assembly comprises a cover plate and the liquid storage member, the cover plate is provided with at least one liquid storage part, the liquid storage member is arranged in the liquid storage part, the cover plate is adapted to be electrically connected with the tab, and the liquid storage part is located on the side of the cover plate facing the accommodation cavity.

21. The battery of claim 19, wherein, The electric core is provided with a tab, and the cover plate assembly comprises a cover plate and the liquid storage member, the cover plate is provided with at least one liquid storage part, the liquid storage member is arranged in the liquid storage part, the cover plate is adapted to be electrically connected with the tab, and the liquid storage part is located on the side of the cover plate facing the accommodation cavity. The first surface is provided with a first connecting part, the first connecting part protrudes towards the electric core, so that the first connecting part is adapted to be electrically connected with the tab; and / or The second surface is provided with a second connecting part, the second connecting part protrudes towards the cover plate along the first direction, and the second connecting part is adapted to be electrically connected with the cover plate.

22. The battery according to claim 21, wherein The cover plate is provided with a protruding part, the protruding part protrudes towards the direction of the current collecting disc, the second connecting part and the protruding part are correspondingly arranged, so that the second connecting part is adapted to be electrically connected with the protruding part.

23. A battery pack, characterized by Comprise: The battery according to any one of claims 19-22.

24. An electrical device, comprising: Comprise: The battery pack according to claim 23 and / or the battery according to any one of claims 20-22.

Images