Current collecting plate, battery and electric equipment

Abstract

The invention provides a collector plate, a battery and electric equipment. The flow collecting disc comprises a flow collecting disc body and a turnover piece, a through hole is formed in the flow collecting disc body, the turnover piece is arranged at the through hole, the turnover piece comprises a flow collecting part and a connecting part, the connecting part is connected with the flow collecting part and the flow collecting disc body, the partial thickness of the connecting part is smaller than the thickness of other parts of the connecting part, and / or the turnover piece is arranged on the flow collecting disc body. The thickness of at least part of the connecting part is smaller than that of the collector plate body, and / or the thickness of at least part of the connecting part is smaller than that of the collector part. According to the collector plate, the turnover piece is easier to turn over, the turnover angle of the turnover piece is guaranteed, and the unfolding effect of the collector plate is improved.

Description

Technical Field

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

[0002] Batteries are widely used in energy storage systems, transportation, consumer electronics and other fields. Thermal runaway refers to the phenomenon that during the operation of the battery, the chemical reaction is accelerated due to the increase in internal temperature, which leads to further increase in temperature, thus forming a self-reinforcing feedback loop, which may eventually lead to battery overheating, smoking, burning or even explosion.

[0003] In order to prevent the battery from thermal runaway, the collector plate needs to be unfolded to relieve the pressure of the battery when the battery thermal runaway occurs. In the related art, the unfolding effect of the collector plate needs to be improved. Summary of the invention

[0004] The embodiments of the present application provide a current collecting plate, a battery and an electrical device, which can improve the technical problem that the deployment effect of the current collecting plate still needs to be improved.

[0005] In a first aspect, an embodiment of the present application provides a current collecting plate, comprising:

[0006] The collecting plate body is formed with a through hole;

[0007] A folding piece, arranged at the through hole, the folding piece comprises a current collecting portion and a connecting portion, the connecting portion connecting the current collecting portion and the current collecting plate body;

[0008] Part of the thickness of the connecting portion is smaller than the thickness of other parts of the connecting portion, and / or at least part of the thickness of the connecting portion is smaller than the thickness of the collecting plate body, and / or at least part of the thickness of the connecting portion is smaller than the thickness of the collecting portion.

[0009] In one embodiment, the connecting part includes a first metal connecting part and a second metal connecting part, the first metal connecting part connects the second metal connecting part and the current collecting plate body, the second metal connecting part is connected to the current collecting part, and the connection between the first metal connecting part and the second metal connecting part is located at the position where the thickness of the connecting part is the smallest.

[0010] In one embodiment, the first metal connection portion includes a first secondary connection portion and a second secondary connection portion, the first secondary connection portion connects the second secondary connection portion and the current collecting plate body, and the second secondary connection portion is connected to the second metal connection portion;

[0011] Wherein, along the direction from the first secondary connection part to the second secondary connection part, the thickness of the second secondary connection part gradually decreases.

[0012] In one embodiment, the second metal connection portion includes a third secondary connection portion and a fourth secondary connection portion, the third secondary connection portion connects the fourth secondary connection portion and the current collecting portion, and the fourth secondary connection portion is connected to the first metal connection portion;

[0013] Wherein, along the direction from the third secondary connection part to the fourth secondary connection part, the thickness of the fourth secondary connection part gradually decreases.

[0014] In one embodiment, the number of the through holes and the number of the folding parts are both plural, and the plurality of through holes and the plurality of folding parts correspond one to one.

[0015] In one embodiment, the collecting plate body includes an edge portion, a center portion and a connecting piece, the connecting piece connects the edge portion and the center portion, and a plurality of the folding pieces are arranged around the center portion.

[0016] In one embodiment, a plurality of the folding members are all connected to the edge portion; and / or, a plurality of the folding members are all connected to the central portion; and / or, different folding members are connected to different connecting members.

[0017] In one embodiment, a thickness of a portion of the connecting member is smaller than a thickness of other portions of the connecting member.

[0018] In one embodiment, the connector includes a first metal connecting segment and a second metal connecting segment, the first metal connecting segment connects the second metal connecting segment and the edge portion, the second metal connecting segment is connected to the center portion, and the connection between the first metal connecting segment and the second metal connecting segment is located at a position where the thickness of the connector is the smallest.

[0019] In one embodiment, the first metal connecting segment includes a first secondary connecting segment and a second secondary connecting segment, the first secondary connecting segment connects the second secondary connecting segment and the edge portion, and the second secondary connecting segment connects to the second metal connecting segment;

[0020] Wherein, along the direction from the first secondary connecting segment to the second secondary connecting segment, the thickness of the second secondary connecting segment gradually decreases.

[0021] In one embodiment, the second metal connecting section includes a third secondary connecting section and a fourth secondary connecting section, the third secondary connecting section connects the fourth secondary connecting section and the central portion, and the fourth secondary connecting section is connected to the first metal connecting section;

[0022] Wherein, along the direction from the third secondary connecting segment to the fourth secondary connecting segment, the thickness of the fourth secondary connecting segment gradually decreases.

[0023] In one embodiment, there are multiple connecting members, and the multiple connecting members are evenly arranged around the central portion.

[0024] In one embodiment, the distance between the end of the first metal connecting section away from the connecting point and the connecting point is L1, and the distance between the end of the second metal connecting section away from the connecting point and the connecting point is L2, wherein:

[0025] L1 is less than L2; or,

[0026] The ratio of L1 to L2 is between 0.2 and 1.

[0027] In one embodiment, the maximum thickness of the connecting member is between 0.1 mm and 3 mm; and / or the ratio of the thickness of the connecting portion to the maximum thickness of the connecting member is less than or equal to 0.7.

[0028] In one embodiment, the central portion protrudes from the folding member.

[0029] In one embodiment, the first end of the second metal connecting segment is connected to the first metal connecting segment, the second end of the second metal connecting segment is connected to the central portion, and the second end of the second metal connecting segment protrudes in a direction away from the first metal connecting segment relative to the first end of the second metal connecting segment.

[0030] In a second aspect, an embodiment of the present application provides a battery, comprising a shell, a winding core and the above-mentioned current collecting plate, wherein the shell is formed with an installation cavity, the winding core and the current collecting plate are both arranged in the installation cavity, and the current collecting plate is connected to the winding core.

[0031] In one embodiment, the collecting plate body includes an edge portion, a center portion and a connecting piece, the connecting piece connects the edge portion and the center portion, and the center portion is formed with a liquid injection hole.

[0032] In one embodiment, the ratio of the area of ​​the injection hole to the cross-sectional area of ​​the winding core is less than 0.2.

[0033] In one embodiment, the diameter of the injection hole is D1, the diameter of the central portion is D2, the capacity of the battery is M, the fast charging capability of the battery is N, the current flow capacity of the collecting plate is I, wherein 1 / 4πD22 -1 / 4πD12>MN / I.

[0034] In a third aspect, an embodiment of the present application provides an electrical device, comprising the battery described above.

[0035] Beneficial effects of the embodiments of the present application:

[0036] In an embodiment of the present application, by setting the thickness of some of the connecting parts to be smaller than the thickness of the connecting parts of other parts, that is, thinning the thickness of some of the connecting parts, the thinned connecting parts are more likely to bend, and thus the folding piece is more likely to fold, thereby ensuring the folding angle of the folding piece and improving the unfolding effect of the collecting plate.

[0037] By setting the thickness of at least part of the connecting portion to be smaller than the thickness of the collecting plate body, that is, thinning the thickness of at least part of the connecting portion, the connecting portion after the thickness is thinned is easier to bend, thereby reducing the difficulty of folding the collecting portion relative to the connecting portion, thereby making it easier for the folding piece to be folded, ensuring the folding angle of the folding piece, and improving the unfolding effect of the collecting plate.

[0038] By setting the thickness of at least part of the connecting portion to be smaller than the thickness of the collecting portion, that is, thinning the thickness of at least part of the connecting portion, the connecting portion after the thickness is reduced is easier to bend, thereby reducing the difficulty of folding the collecting portion relative to the connecting portion, thereby making it easier for the folding piece to fold, ensuring the folding angle of the folding piece, and improving the unfolding effect of the collecting plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 It is one of the structural schematic diagrams of the current collecting plate provided in the embodiment of the present application;

[0041] Figure 2 This is the second structural schematic diagram of the current collecting plate provided in the embodiment of the present application;

[0042] Figure 3 is a cross-sectional view of a current collecting plate provided in an embodiment of the present application;

[0043] Figure 4 is a schematic structural diagram of a connection portion provided in an embodiment of the present application;

[0044] Figure 5 It is one of the structural schematic diagrams of the connecting piece provided in the embodiment of the present application;

[0045] Figure 6 This is the second structural schematic diagram of the connecting member provided in the embodiment of the present application;

[0046] Figure 7 is a schematic structural diagram of a current collecting plate provided in an embodiment of the present application, wherein the central portion is raised and the connecting member is not disconnected;

[0047] Figure 8 is a schematic structural diagram of a current collecting plate provided in an embodiment of the present application, wherein the connecting member is disconnected;

[0048] Fig. 9 It is a schematic diagram of the structure of the collecting plate provided in an embodiment of the present application, wherein the connecting member is disconnected and the folding member is unfolded. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0050] Combine the following Figures 1 to 9 The collecting plate, battery and electric equipment of the present application are described.

[0051] According to the embodiment of the first aspect of the present application, refer to Figure 1 , Figure 2 and Figure 3 The current collecting plate includes a current collecting plate body 1 and a folding piece 2. The current collecting plate body 1 is formed with a through hole 11. The folding piece 2 is arranged at the through hole 11. The folding piece 2 includes a current collecting portion 21 and a connecting portion 22. The connecting portion 22 connects the current collecting portion 21 and the current collecting plate body 1.

[0052] The thickness of part of the connection part 22 is smaller than the thickness of other parts of the connection part 22 , and / or the thickness of at least part of the connection part 22 is smaller than the thickness of the collecting plate body 1 , and / or the thickness of at least part of the connection part 22 is smaller than the thickness of the collecting part 21 .

[0053] According to the collecting plate of the embodiment of the present application, by setting the partial thickness of the connecting portion 22 to be smaller than the thickness of other portions of the connecting portion 22, that is, thinning the thickness of the partial connecting portion 22, the thinned partial connecting portion 22 is more likely to bend, and thus the folding piece 2 is more likely to be folded, thereby ensuring the folding angle of the folding piece 2 and improving the unfolding effect of the collecting plate.

[0054] By setting the thickness of at least part of the connecting portion 22 to be smaller than the thickness of the collecting plate body 1, that is, thinning the thickness of at least part of the connecting portion 22, the connecting portion 22 after the thickness is reduced is easier to bend, thereby reducing the difficulty of folding the collecting portion 21 relative to the connecting portion 22, thereby making it easier for the folding piece 2 to be folded, ensuring the folding angle of the folding piece 2, and improving the unfolding effect of the collecting plate.

[0055] By setting the thickness of at least part of the connecting portion 22 to be smaller than the thickness of the collecting portion 21, that is, thinning the thickness of at least part of the connecting portion 22, the connecting portion 22 after the thickness is reduced is easier to bend, thereby reducing the difficulty of folding the collecting portion 21 relative to the connecting portion 22, thereby making it easier for the folding piece 2 to fold, ensuring the folding angle of the folding piece 2, and improving the unfolding effect of the collecting plate.

[0056] It can be understood that the unfolding effect of the current collecting tray refers to the folding degree / folding angle of the folding piece 2. The greater the folding degree / folding angle of the folding piece 2, the better the unfolding effect of the current collecting tray.

[0057] The expansion effect of the collecting plate can also refer to the exhaust effect of the collecting plate, which can also be understood as the exhaust area of ​​the collecting plate. When the folding angle of the folding member 2 is larger, the folding member will have less obstruction to the gas passing through the collecting plate, the exhaust area of ​​the collecting plate will be larger, and the exhaust effect will be better.

[0058] It can be understood that the collecting disk is connected to the winding core of the battery. When the battery has thermal runaway, the high-temperature gas will flow to the collecting disk. The high-temperature gas acts on the folding piece 2 through the through hole 11, causing the folding piece 2 to fold, thereby unfolding the collecting disk, so that the high-temperature gas can pass through the collecting disk and be discharged, thereby depressurizing the battery and ensuring the safety of the battery.

[0059] It can be understood that by reducing the thickness of the connecting portion 22, when the battery is overcharged or overcurrent occurs, the temperature rises and the thinned connecting portion 22 will fuse, thereby disconnecting the current collecting portion 21 and the current collecting disc body 1, achieving power-off protection and improving the safety of the battery.

[0060] When the battery has thermal runaway, the thinned connection part 22 will also melt. If only part of the connection part 22 is thinned, the difficulty of folding the current collecting part 21 is reduced after the thinned connection part 22 melts, which is conducive to the folding of the folding part 2; if all the connection parts 22 are thinned, the connection parts 22 will melt directly, and under the action of the gas generated by thermal runaway, the current collecting part 21 will directly detach from the current collecting plate body 1, improving the unfolding effect of the folding part 2.

[0061] In some embodiments, see Figure 1 and Figure 4 The connecting part 22 includes a first metal connecting part 221 and a second metal connecting part 222. The first metal connecting part 221 connects the second metal connecting part 222 and the current collecting plate body 1, and the second metal connecting part 222 is connected to the current collecting part 21. The connection between the first metal connecting part 221 and the second metal connecting part 222 is located at the position where the thickness of the connecting part 22 is the smallest.

[0062] It can be understood that by reducing the thickness of the connection between the first metal connection part 221 and the second metal connection part 222, the difficulty of folding the second metal connection part 222 connected to the collecting part 21 relative to the first metal connection part 221 is reduced, making it easier for the folding part 2 to fold, thereby ensuring the folding angle of the folding part 2 and improving the unfolding effect of the collecting plate.

[0063] It is understandable that setting the thickness of the connection between the first metal connection part 221 and the second metal connection part 222 to the minimum thickness of the connection part 22 effectively reduces the difficulty of folding the second metal part relative to the first metal part, making it easier for the current collecting part 21 to fold. At the same time, it is ensured that the connection between the first metal connection part 221 and the second metal connection part 222 can be fused when overcharging or overcurrent occurs.

[0064] In some embodiments, see Figure 1 and Figure 4 The first metal connection part 221 includes a first secondary connection part 2211 and a second secondary connection part 2212, the first secondary connection part 2211 connects the second secondary connection part 2212 and the current collecting plate body 1, and the second secondary connection part 2212 is connected to the second metal connection part 222;

[0065] Wherein, along the direction from the first secondary connection portion 2211 to the second secondary connection portion 2212 , the thickness of the second secondary connection portion 2212 gradually decreases.

[0066] It can be understood that the thickness of the second secondary connection part 2212 is set to gradually decrease, and then the thickness of the connection part 22 gradually decreases from the second secondary connection part 2212 to the connection between the second secondary connection part 2212 and the second metal connection part 222, so as to facilitate the forming of the first metal connection part 221 and the connection part 22.

[0067] In some embodiments, see Figure 1 and Figure 4 The second metal connection part 222 includes a third secondary connection part 2221 and a fourth secondary connection part 2222, the third secondary connection part 2221 connects the fourth secondary connection part 2222 and the current collecting part 21, and the fourth secondary connection part 2222 is connected to the first metal connection part 221;

[0068] Wherein, along the direction from the third secondary connection portion 2221 to the fourth secondary connection portion 2222 , the thickness of the fourth secondary connection portion 2222 gradually decreases.

[0069] It can be understood that the thickness of the fourth secondary connection part 2222 is set to gradually decrease, and then from the fourth secondary connection part 2222 to the connection between the fourth secondary connection part 2222 and the first metal connection part 221, the thickness of the connection part 22 gradually decreases, which facilitates the molding of the second metal connection part 222 and the connection part 22.

[0070] In some embodiments, there are multiple through holes 11 and multiple folding pieces 2 , and the multiple through holes 11 correspond to the multiple folding pieces 2 one by one.

[0071] It can be understood that when thermal runaway occurs in the battery, each folding piece 2 will be folded, thereby ensuring the unfolding effect of the current collecting plate.

[0072] In some embodiments, see Figure 1 and Figure 2 The collecting plate body 1 includes an edge portion 12 , a center portion 13 and a connecting member 14 . The connecting member 14 connects the edge portion 12 and the center portion 13 . A plurality of folding members 2 are arranged around the center portion 13 .

[0073] Specifically, the plurality of folding members 2 are all connected to the edge portion 12 .

[0074] It can be understood that when thermal runaway occurs in the battery, the folding piece 2 can be folded relative to the edge portion 12 to achieve the unfolding of the current collecting plate.

[0075] Specifically, the plurality of folding members 2 are all connected to the central portion 13 .

[0076] It can be understood that when thermal runaway occurs in the battery, the folding piece 2 can be folded relative to the central portion 13 to achieve the unfolding of the current collecting plate.

[0077] Specifically, different folding members 2 are connected to different connecting members 14 .

[0078] It is understandable that when the battery has thermal runaway, the folding member 2 can be folded relative to the connecting member 14 to achieve the unfolding of the current collecting plate. At the same time, since different folding members 2 are connected to different connecting members 14, the mutual interference between different folding members 2 can be reduced, ensuring that different folding members 2 can be folded and unfolded.

[0079] In some embodiments, see Figure 5 , Figure 6 and Figure 7 , the thickness of part of the connecting member 14 is smaller than the thickness of other parts of the connecting member 14 .

[0080] It can be understood that by setting the thickness of part of the connecting member 14 to be smaller than the thickness of other parts of the connecting member 14 , the thickness of part of the connecting member 14 is thinned.

[0081] When the battery has thermal runaway, the gas generated during thermal runaway acts on the center, causing the center to move away from the edge 12. The center will pull the connector 14. Since the connection between the thinned part of the connector 14 and the unthinned part of the connector 14 is easily deformed, the center can bulge under the action of the gas. In other words, in the early stage of thermal runaway of the battery, the center will first pull away from the battery's winding core. At this time, the connector 14 will deform so that the center can bulge smoothly. In other words, the connector 14 will not be directly disconnected at this time, so that the collector disk and the winding core remain electrically connected in the early stage of thermal runaway, avoiding the collector disk directly detaching from the winding core in the early stage of thermal runaway, causing the structure of the winding core to be destroyed, and avoiding the positive and negative poles of the winding core to be short-circuited and aggravate thermal runaway.

[0082] As thermal runaway develops, see Figure 8 and Fig. 9 The thinned portion of the connector 14 will be disconnected, so that the central portion can be detached, thereby realizing the unfolding of the collecting plate.

[0083] When the battery is overcharged or overcurrent occurs, which may cause the temperature to be too high, the thinned portion of the connector 14 will fuse to achieve power-off protection, thereby improving the safety of the battery.

[0084] In some embodiments, see Figure 5 and Figure 6 The connector 14 includes a first metal connecting segment 141 and a second metal connecting segment 142. The first metal connecting segment 141 connects the second metal connecting segment 142 and the edge portion 12, and the second metal connecting segment 142 is connected to the center portion 13. The connection between the first metal connecting segment 141 and the second metal connecting segment 142 is located at the position where the thickness of the connector 14 is the smallest.

[0085] It can be understood that the thickness of the connection between the first metal connecting section 141 and the second metal connecting section 142 is thinned, which reduces the difficulty of the second metal connecting part 222 to deform relative to the first metal connecting part 221, and further reduces the difficulty of the center part 13 bulging away from the battery core, so that the center part 13 can be pulled away from the battery core in the early stage of thermal runaway, and the connector 14 will not be directly disconnected, so that the collector disk and the core remain electrically connected in the early stage of thermal runaway, avoiding the current collector disk directly detaching from the core in the early stage of thermal runaway, causing the structure of the core to be destroyed, and avoiding the positive and negative poles of the core to be short-circuited to aggravate thermal runaway, and the folding member 2 is more likely to fold, which ensures the folding angle of the folding member 2 and improves the unfolding effect of the collector disk.

[0086] It can be understood that setting the thickness of the connection between the first metal connection segment 141 and the second metal connection segment 142 to the minimum thickness of the connector 14 effectively reduces the difficulty of the second metal portion deforming relative to the first metal portion, making it easier for the central portion 13 to bulge away from the winding core. At the same time, it ensures that the connection between the first metal connection portion 221 and the second metal connection portion 222 can be fused when overcharging or overcurrent occurs.

[0087] In some embodiments, see Figure 5 and Figure 6 The first metal connecting segment 141 includes a first secondary connecting segment 1411 and a second secondary connecting segment 1412, the first secondary connecting segment 1411 connects the second secondary connecting segment 1412 and the edge portion 12, and the second secondary connecting segment 1412 connects to the second metal connecting segment 142;

[0088] Wherein, along the direction from the first secondary connecting segment 1411 to the second secondary connecting segment 1412 , the thickness of the second secondary connecting segment 1412 gradually decreases.

[0089] It can be understood that the thickness of the second secondary connecting segment 1412 is set to gradually decrease, and then the thickness of the connecting piece 14 gradually decreases from the second secondary connecting segment 1412 to the connection between the second secondary connecting segment 1412 and the second metal connecting segment 142, so as to facilitate the molding of the first metal connecting segment 141 and the connecting piece 14.

[0090] In some embodiments, see Figure 5 and Figure 6 The second metal connecting segment 142 includes a third secondary connecting segment 1421 and a fourth secondary connecting segment 1422, the third secondary connecting segment 1421 connects the fourth secondary connecting segment 1422 and the central portion 13, and the fourth secondary connecting segment 1422 is connected to the first metal connecting segment 141;

[0091] Wherein, along the direction from the third secondary connecting segment 1421 to the fourth secondary connecting segment 1422 , the thickness of the fourth secondary connecting segment 1422 gradually decreases.

[0092] It can be understood that the thickness of the fourth secondary connecting segment 1422 is set to gradually decrease, and then the thickness of the connecting piece 14 gradually decreases from the fourth secondary connecting segment 1422 to the connection between the fourth secondary connecting segment 1422 and the first metal connecting segment 141, so as to facilitate the molding of the second metal connecting segment 142 and the connecting piece 14.

[0093] In some embodiments, there are multiple connecting members 14 , and the multiple connecting members 14 are evenly arranged around the central portion 13 .

[0094] It is understandable that the multiple connectors 14 are evenly arranged around the central portion 13, so that the force exerted by the connectors 14 on the central portion 13 is uniform, or it can be said that the force exerted by the central portion 13 on each connector 14 is the same. Furthermore, in the early stage of thermal runaway of the battery, the gas generated by the thermal runaway acts on the central portion 13, and the central portion 13 transmits the force to each connector 14, so that the deformation amplitude of the thinned thickness portion of each connector 14 is the same, ensuring the uniformity of the bulge of the central portion 13, that is, ensuring that the central portion 13 can be pulled up evenly.

[0095] In some embodiments, see Figure 5 and Figure 6 The distance between the end of the first metal connecting section 141 away from the connecting point and the connecting point is L1, and the distance between the end of the second metal connecting section 142 away from the connecting point and the connecting point is L2.

[0096] Specifically, L1 is smaller than L2, so that the length of the connector 14 between the center portion 13 and the connection point is greater than the length of the connector 14 of the remaining portion, thereby ensuring the protrusion height of the center portion 13 in the early stage of thermal runaway of the battery.

[0097] It is understandable that if the length of the connector 14 between the center portion 13 and the connection is too short, then in the early stage of thermal runaway of the battery, the protruding height of the center portion 13 is limited, and it is difficult for the center portion 13 to effectively distance itself from the battery core.

[0098] Specifically, the ratio of L1 to L2 is between 0.2 and 1.

[0099] It is understandable that if the ratio of L1 to L2 is less than 0.2, the length of the connector 14 between the center 13 and the connection is too long, and the protrusion height of the center 13 is too high. In the early stage of thermal runaway, the center 13 may break the connector 14; if the ratio of L1 to L2 is greater than 1, the length of the connector 14 between the center 13 and the connection is too short, and the protrusion height of the center 13 is limited, making it difficult for the center 13 to effectively distance itself from the battery core. Therefore, the present application sets the ratio of L1 to L2 between 0.2 and 1.

[0100] In some embodiments, the maximum thickness of the connector 14 is between 0.1 mm and 3 mm, that is, the thickness of the connector 14 without reduced thickness is between 0.1 mm and 3 mm.

[0101] It is understandable that if the maximum thickness of the connector 14 is less than 0.1 mm, the strength of the connector 14 is insufficient; if the maximum thickness of the connector 14 is greater than 3 mm, the connector 14 may have a significant impact on the size of the collector plate. Therefore, the present application sets the maximum thickness of the connector 14 to between 0.1 mm and 3 mm.

[0102] In some embodiments, the ratio of the thickness of the connection to the maximum thickness of the connector 14 is less than or equal to 0.7.

[0103] It can be understood that the thickness of the connection is thinned to a level less than or equal to 0.7 times the original thickness, thereby ensuring the effect of thinning the thickness of the connection.

[0104] In some embodiments, the central portion 13 protrudes from the folding element 2 .

[0105] It can be understood that after the current collecting plate is installed on the battery, since the central portion 13 protrudes from the folded portion, an air chamber space can be formed between the current collecting plate and the wall of the battery. The air chamber space can be used to accommodate the gas generated during normal operation of the battery, thereby avoiding excessive internal air pressure in the battery due to the gas generated during normal operation.

[0106] In some embodiments, the first end of the second metal connecting segment 142 is connected to the first metal connecting segment 141, the second end of the second metal connecting segment 142 is connected to the central portion 13, and the second end of the second metal connecting segment 142 protrudes away from the first metal connecting segment 141 relative to the first end of the second metal connecting segment 142.

[0107] It can be understood that when the central portion 13 is affected by gas, it will bulge in the direction away from the battery core. The second end of the second metal connecting segment 142 is connected to the central portion, and the second end of the second metal connecting segment 142 will bulge in the direction away from the first metal connecting segment 141 under the pull of the central portion 13.

[0108] It is understandable that when the battery is formed, the second end of the second metal connecting segment 142 can be set to protrude in the direction away from the first metal connecting segment 141, so that the center portion 13 protrudes in the direction away from the first metal connecting segment 141, thereby increasing the distance between the center portion 13 and the battery winding core, and forming a space between the center portion 13 and the battery winding core for accommodating the gas generated by the normal operation of the battery, thereby avoiding deformation or displacement of the center portion 13 due to the gas generated by the normal operation of the battery.

[0109] According to an embodiment of the second aspect of the present application, the battery includes a shell, a winding core and the above-mentioned current collecting plate, the shell is formed with an installation cavity, the winding core and the current collecting plate are both arranged in the installation cavity, and the current collecting plate is connected to the winding core.

[0110] According to the battery of the embodiment of the present application, by setting the thickness of part of the connecting part 22 to be smaller than the thickness of other parts of the connecting part 22, that is, thinning the thickness of part of the connecting part 22, the part of the connecting part 22 after the thickness is thinned is more likely to bend, and then the folding piece 2 is more likely to be folded, thereby ensuring the folding angle of the folding piece 2, improving the unfolding effect of the collecting plate, and allowing the internal pressure and gas of the battery to be effectively released when thermal runaway occurs.

[0111] By setting the thickness of at least part of the connecting portion 22 to be smaller than the thickness of the collecting plate body 1, that is, thinning the thickness of at least part of the connecting portion 22, the connecting portion 22 after the thickness is thinned is easier to bend, thereby reducing the difficulty of folding the collecting portion 21 relative to the connecting portion 22, thereby making it easier for the folding piece 2 to fold, ensuring the folding angle of the folding piece 2, and improving the unfolding effect of the collecting plate, so that the internal pressure and gas of the battery can be effectively released when thermal runaway occurs.

[0112] By setting the thickness of at least part of the connecting portion 22 to be smaller than the thickness of the collecting portion 21, that is, thinning the thickness of at least part of the connecting portion 22, the connecting portion 22 after the thickness is reduced is easier to bend, thereby reducing the difficulty of folding the collecting portion 21 relative to the connecting portion 22, thereby making it easier for the folding piece 2 to fold, ensuring the folding angle of the folding piece 2, and improving the unfolding effect of the collecting plate, so that the internal pressure and gas of the battery can be effectively released when thermal runaway occurs.

[0113] In some embodiments, see Figure 1 and Figure 2 The collecting plate body 1 includes an edge portion 12 , a center portion 13 and a connecting member 14 . The connecting member 14 connects the edge portion 12 and the center portion 13 . The center portion 13 is formed with a liquid injection hole 131 .

[0114] It can be understood that, by forming the injection hole 131 in the central portion 13 , liquid can be injected into the winding core through the injection hole 131 , which is simple and convenient.

[0115] Specifically, the ratio of the area of ​​the injection hole 131 to the cross-sectional area of ​​the winding core is less than 0.2, so as to avoid the area of ​​the injection hole 131 being too large and affecting the structural strength of the collecting plate.

[0116] In some embodiments, see Figure 1 and Figure 2 , the diameter of the injection hole 131 is D1, the diameter of the center part 13 is D2, the capacity of the battery is M, the fast charging capability of the battery is N, and the current capacity of the collecting plate is I, wherein 1 / 4πD22 -1 / 4πD12>MN / I, to prevent excessive temperature rise and ensure the safety of the battery.

[0117] In some examples, the unit of diameter D1 of the injection hole 131 is mm, the unit of diameter D2 of the center portion 13 is mm, the unit of battery capacity M is Ah, the unit of fast charging capability N of the battery is C, and the unit of current flow capacity I of the collecting plate is A / mm.

[0118] According to an embodiment of the third aspect of the present application, the electrical equipment includes the above-mentioned battery.

[0119] According to the electrical equipment of the embodiment of the present application, by setting the partial thickness of the connecting part 22 to be smaller than the thickness of other parts of the connecting part 22, that is, thinning the thickness of the partial connecting part 22, the partial connecting part 22 after the thickness is thinned is more likely to bend, and thus the folding piece 2 is more likely to fold, thereby ensuring the folding angle of the folding piece 2, improving the unfolding effect of the collecting plate, and allowing the internal pressure and gas of the battery to be effectively released when thermal runaway occurs, thereby improving the safety of the electrical equipment.

[0120] By setting the thickness of at least part of the connecting portion 22 to be smaller than the thickness of the collecting plate body 1, that is, thinning the thickness of at least part of the connecting portion 22, the connecting portion 22 after the thickness is thinned is easier to bend, thereby reducing the difficulty of folding the collecting portion 21 relative to the connecting portion 22, thereby making it easier for the folding piece 2 to fold, ensuring the folding angle of the folding piece 2, improving the unfolding effect of the collecting plate, and allowing the internal pressure and gas of the battery to be effectively released when thermal runaway occurs, thereby improving the safety of electrical equipment.

[0121] By setting the thickness of at least part of the connecting portion 22 to be smaller than the thickness of the collecting portion 21, that is, thinning the thickness of at least part of the connecting portion 22, the connecting portion 22 after the thickness is reduced is easier to bend, thereby reducing the difficulty of folding the collecting portion 21 relative to the connecting portion 22, thereby making it easier for the folding member 2 to fold, ensuring the folding angle of the folding member 2, and improving the unfolding effect of the collecting plate, so that the internal pressure and gas of the battery can be effectively released when thermal runaway occurs, thereby improving the safety of the electrical equipment.

[0122] It should be noted that the electrical equipment can be a vehicle, an energy storage power supply, a consumer electronic device, a medical device, a smart city, an aircraft, or a household appliance. It should be noted that the above is only an example of electrical equipment and does not specifically limit the electrical equipment.

[0123] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A collecting plate, characterized in that: include: The collecting plate body is formed with a through hole; A folding piece, arranged at the through hole, the folding piece comprises a current collecting portion and a connecting portion, the connecting portion connecting the current collecting portion and the current collecting plate body; Part of the thickness of the connecting portion is smaller than the thickness of other parts of the connecting portion, and / or at least part of the thickness of the connecting portion is smaller than the thickness of the collecting plate body, and / or at least part of the thickness of the connecting portion is smaller than the thickness of the collecting portion.

2. The collecting plate according to claim 1, characterized in that: The connection part includes a first metal connection part and a second metal connection part, the first metal connection part connects the second metal connection part and the current collecting plate body, the second metal connection part is connected to the current collecting part, and the connection between the first metal connection part and the second metal connection part is located at a position where the thickness of the connection part is the smallest.

3. The collecting plate according to claim 2, characterized in that: The first metal connection portion includes a first secondary connection portion and a second secondary connection portion, the first secondary connection portion connects the second secondary connection portion and the current collecting plate body, and the second secondary connection portion is connected to the second metal connection portion; Wherein, along the direction from the first secondary connection part to the second secondary connection part, the thickness of the second secondary connection part gradually decreases.

4. The collecting plate according to claim 2, characterized in that: The second metal connection portion includes a third secondary connection portion and a fourth secondary connection portion, the third secondary connection portion connects the fourth secondary connection portion and the current collecting portion, and the fourth secondary connection portion is connected to the first metal connection portion; Wherein, along the direction from the third secondary connection part to the fourth secondary connection part, the thickness of the fourth secondary connection part gradually decreases.

5. The collecting plate according to any one of claims 1 to 4, characterized in that: The number of the through holes and the folding parts are both multiple, and the multiple through holes and the multiple folding parts correspond one to one.

6. The collecting plate according to claim 5, characterized in that: The collecting plate body comprises an edge portion, a center portion and a connecting piece, wherein the connecting piece connects the edge portion and the center portion, and a plurality of folding pieces are arranged around the center portion.

7. The collecting plate according to claim 6, characterized in that: A plurality of the folding members are all connected to the edge portion; and / or, a plurality of the folding members are all connected to the central portion; and / or, different folding members are connected to different connecting members.

8. The collecting plate according to claim 6, characterized in that: The thickness of a portion of the connecting member is smaller than the thickness of other portions of the connecting member.

9. The collecting plate according to claim 8, characterized in that: The connector includes a first metal connecting segment and a second metal connecting segment, the first metal connecting segment connects the second metal connecting segment and the edge portion, the second metal connecting segment is connected to the center portion, and the connection between the first metal connecting segment and the second metal connecting segment is located at a position where the thickness of the connector is the smallest.

10. The collecting plate according to claim 9, characterized in that: The first metal connecting segment includes a first secondary connecting segment and a second secondary connecting segment, the first secondary connecting segment connects the second secondary connecting segment and the edge portion, and the second secondary connecting segment connects to the second metal connecting segment; Wherein, along the direction from the first secondary connecting segment to the second secondary connecting segment, the thickness of the second secondary connecting segment gradually decreases.

11. The collecting plate according to claim 9, characterized in that: The second metal connecting section includes a third secondary connecting section and a fourth secondary connecting section, the third secondary connecting section connects the fourth secondary connecting section and the central portion, and the fourth secondary connecting section is connected to the first metal connecting section; Wherein, along the direction from the third secondary connecting segment to the fourth secondary connecting segment, the thickness of the fourth secondary connecting segment gradually decreases.

12. The collecting plate according to claim 9, characterized in that: The number of the connecting members is multiple, and the multiple connecting members are evenly arranged around the central part.

13. The collecting plate according to claim 9, characterized in that: The distance between the end of the first metal connecting section away from the connecting point and the connecting point is L1, and the distance between the end of the second metal connecting section away from the connecting point and the connecting point is L2, wherein, L1 is less than L2; or, The ratio of L1 to L2 is between 0.2 and 1.

14. The collecting plate according to claim 9, characterized in that: The maximum thickness of the connecting piece is between 0.1 mm and 3 mm; and / or the ratio of the thickness of the connecting portion to the maximum thickness of the connecting piece is less than or equal to 0.

7.

15. The collecting plate according to claim 6, characterized in that: The central portion protrudes from the folding member.

16. The collecting plate according to claim 9, characterized in that: The first end of the second metal connecting segment is connected to the first metal connecting segment, the second end of the second metal connecting segment is connected to the central portion, and the second end of the second metal connecting segment protrudes in a direction away from the first metal connecting segment relative to the first end of the second metal connecting segment.

17. A battery, characterized in that: It comprises a shell, a winding core and a current collecting plate as claimed in any one of claims 1 to 16, wherein the shell is formed with an installation cavity, the winding core and the current collecting plate are both arranged in the installation cavity, and the current collecting plate is connected to the winding core.

18. The battery according to claim 17, characterized in that The collecting plate body includes an edge portion, a center portion and a connecting piece, wherein the connecting piece connects the edge portion and the center portion, and a liquid injection hole is formed in the center portion.

19. The battery according to claim 18, characterized in that The ratio of the area of ​​the injection hole to the cross-sectional area of ​​the winding core is less than 0.

2.

20. The battery according to claim 19, characterized in that The diameter of the injection hole is D1, the diameter of the central part is D2, the capacity of the battery is M, the fast charging capability of the battery is N, the current flow capacity of the collecting plate is I, wherein 1 / 4πD22-1 / 4πD12>MN / I.

21. An electrical equipment, characterized in that: Comprising a battery as claimed in any one of claims 17 to 20.

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