Collector plate, battery and electronic device

Abstract

The utility model provides a current collecting disc, a battery and an electronic device, and relates to the technical field of batteries, the current collecting disc is formed by stamping a plate, the edge of the current collecting disc is provided with a blanking groove, the blanking groove penetrates through the current collecting disc along the thickness direction of the current collecting disc, and the blanking groove is arranged in the blanking groove. The blanking groove corresponds to the connecting part of the flow collecting disc and the plate before separation, and the width W1 of the blanking groove in the circumferential direction of the flow collecting disc is larger than or equal to 0.1 mm and smaller than or equal to 2mm. According to the flow collecting disc, the blanking grooves are formed in the edge of the flow collecting disc and correspond to the connecting part of the flow collecting disc and the plate before separation, and the width of the blanking grooves in the circumferential direction of the flow collecting disc is far smaller than the perimeter of the flow collecting disc, so that the connecting area of the flow collecting disc and the plate before separation is greatly reduced, and the connecting strength is reduced. Therefore, when the flow collecting disc is separated from the plate, the stress of the plate on the flow collecting disc can be reduced to a great extent, the deformation of the flow collecting disc is avoided, and the straightness of the flow collecting disc is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a current collecting plate, a battery and an electronic device. Background Art

[0002] With the development of social economy and new energy technology, more and more electronic devices use batteries as energy storage devices. As the current collecting element inside the battery, the collector plate plays an important role in the current transmission between the electrode assembly and the external circuit.

[0003] Currently, the collector plates of most batteries are formed by punching the collector plates out of the plates as a whole.

[0004] However, due to the large area of ​​the collector plate, the force area is large during stamping and blanking, and there is uneven force between different areas around the collector plate, which causes the collector plate to deform, affecting the processing quality of the collector plate and the assembly quality of the battery. Utility Model Content

[0005] In view of the above problems, the utility model provides a collecting plate, a battery and an electronic device, which can reduce the stress of the plate on the collecting plate when the collecting plate is separated from the plate, avoid deformation of the collecting plate, and facilitate high-precision assembly of the collecting plate in the battery.

[0006] The utility model provides a current collecting tray, which is formed by stamping a plate. A blanking groove is provided at the edge of the current collecting tray, and the blanking groove penetrates the current collecting tray along the thickness direction of the current collecting tray. The blanking groove corresponds to the connection position between the current collecting tray and the plate before separation, and the width W1 of the blanking groove in the circumferential direction of the current collecting tray satisfies: 0.1mm≤W1≤2mm.

[0007] In some embodiments, there are a plurality of the material drop grooves, and the plurality of the material drop grooves are distributed at intervals along the circumference of the collecting plate.

[0008] In some embodiments, the plurality of material drop grooves are distributed at equal intervals in the circumferential direction of the current collecting plate.

[0009] In some embodiments, the width W1 of the material drop groove in the circumferential direction of the collecting plate satisfies: 0.5 mm≤W1≤1.5 mm.

[0010] In some embodiments, the depth H1 of the blanking groove along the opening direction satisfies: 0.05 mm ≤ H1 ≤ 2 mm, and the opening direction is parallel to the straight surface on any side of the collecting plate along the thickness direction.

[0011] In some embodiments, the current collecting plate includes a first surface and a second surface opposite to each other in the thickness direction, the first surface is arranged toward the electrode assembly of the battery, and a connection between the slot wall of the blanking slot and the first surface has a chamfered structure formed by stamping.

[0012] In some embodiments, the current collecting plate is provided with a plurality of weight-reducing holes, and the plurality of weight-reducing holes are arranged at intervals around the central area of ​​the current collecting plate. The current collecting plate includes a connecting arm located on the side of the weight-reducing holes facing away from the central area, and the material dropout trough is located on the outer edge of the connecting arm.

[0013] In some embodiments, the inner wall of the weight-reducing hole includes at least one positioning edge, and the positioning edges of a plurality of the weight-reducing holes are symmetrically distributed about the central area.

[0014] The second aspect of the present application provides a battery, comprising: a shell assembly, the shell assembly defines a accommodating cavity; an electrode assembly, the electrode assembly is arranged in the accommodating cavity, and one end of the electrode assembly is provided with a pole ear; the current collecting plate as described in the first aspect of the present application, the current collecting plate is arranged at one end of the electrode assembly provided with the pole ear, and is electrically connected to the pole ear.

[0015] A third aspect of the present application provides an electronic device, comprising: the battery described in the second aspect above.

[0016] The current collecting plate of the utility model is provided with a blanking groove on the edge, and the width W1 of the blanking groove in the circumferential direction of the current collecting plate satisfies: 0.1mm≤W1≤2mm. In this way, the width of the blanking groove in the circumferential direction of the current collecting plate is much smaller than the circumference of the current collecting plate. Before the blanking groove is formed on the current collecting plate, the current collecting plate and the plate are connected only through the position corresponding to the blanking groove, and the remaining parts are separated from the plate in the previous stamping process, so that the connection area between the current collecting plate and the plate before complete separation is greatly reduced, and the connection strength is reduced. In this way, when the current collecting plate is separated from the plate, the stress of the plate on the current collecting plate can be reduced to a large extent, the deformation of the current collecting plate can be avoided, the straightness of the current collecting plate can be ensured, and the high-precision assembly of the current collecting plate in the battery can be facilitated, thereby ensuring the reliability of the current transmission path inside the battery and improving the current transmission performance. In addition, since the blanking groove is recessed toward the inner side of the current collecting plate, the generation of protruding burrs can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a schematic diagram of the structure of batteries in some embodiments of the utility model;

[0019] Figure 2 For along Figure 1 Sectional view of the AA section;

[0020] Figure 3 for Figure 2 The middle circle shows an enlarged view of site B;

[0021] Figure 4 It is a schematic diagram of the structure of the current collecting plate of some embodiments of the utility model;

[0022] Figure 5 For along Figure 4 Sectional view of the CC section;

[0023] Figure 6 for Figure 4 The middle circle shows an enlarged view of site D;

[0024] Figure 7 It is a schematic diagram of the structure of the current collecting plate of other embodiments of the utility model;

[0025] Figure 8 For along Figure 7 Sectional view of the EE section;

[0026] Fig. 9 for Figure 7 The middle circle shows an enlarged view of site F;

[0027] Fig.10 It is a schematic diagram of the structure of the current collecting plate of some other embodiments of the utility model;

[0028] Fig.11 A schematic diagram of the process of stamping and manufacturing a current collecting plate on a plate in some embodiments of the utility model;

[0029] Fig.12 It is a schematic diagram of the structure of the blanking chute of some embodiments of the utility model.

[0030] Description of reference numerals:

[0031] 1000-battery;

[0032] 100-collecting plate;

[0033] 101-feeding chute;

[0034] 102-weight-reducing hole; 1021-positioning edge; 1022-transition edge; 103-connecting arm; 104-central area; 105-thickening portion; 106-first surface; 107-second surface; 108-chamfered structure;

[0035] 200-shell assembly; 201-housing; 2011-top wall; 2012-side wall; 202-cover plate;

[0036] 300-electrode assembly;

[0037] 400-positive electrode collector plate; 500-pole;

[0038] 2000-plate; 2001-connection part; 2002-hollow area;

[0039] M1-first stamping process; M2-second stamping process. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings 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 ordinary technicians in this field without creative work belong to the scope of protection of this application.

[0041] With the development of social economy and new energy technology, more and more electronic devices use batteries as energy storage and supply devices. As the current collecting element inside the battery, the collector plate plays an important role in the current transmission between the electrode assembly and the external circuit. At present, the collector plate of most batteries is punched out from the plate by stamping the plate. However, due to the large area of ​​the collector plate, the force area is large during stamping and blanking, and there is uneven force between different areas around the collector plate, which causes the collector plate to deform, affecting the processing quality of the collector plate and the assembly quality of the battery.

[0042] In view of this, the embodiments of the utility model provide a collecting plate, a battery and an electronic device, which can avoid deformation of the collecting plate during blanking, ensure processing quality, and also help improve the assembly accuracy inside the battery, thereby ensuring the electrical performance of the battery.

[0043] Reference below Figure 1-Figure 12 A current collecting plate 100 according to an embodiment of the present invention is described.

[0044] The current collecting plate 100 of this embodiment can be made by stamping a plate 2000. When the current collecting plate 100 is a positive current collecting plate, the plate 2000 can be an aluminum plate; when the current collecting plate 100 is a negative current collecting plate, the plate 2000 can be a copper plate. When the battery 1000 is a square shell battery, the outer contour of the current collecting plate 100 can be square; when the battery 1000 is a cylindrical battery, the outer contour of the current collecting plate 100 can be circular.

[0045] Combination Figure 4 , Figure 7 and Fig.10 The edge of the current collecting plate 100 is provided with a blanking groove 101, which is a notch formed on the edge of the current collecting plate 100. There are one or more blanking grooves 101. The blanking groove 101 can penetrate the current collecting plate 100 along the thickness direction of the current collecting plate 100. In this way, when the current collecting plate 100 is assembled inside the battery 1000, the blanking groove 101 can connect the internal space of the battery 1000 on both sides of the current collecting plate 100. On the one hand, when gas is generated inside the battery 1000, it is convenient for the gas to flow between the two sides of the current collecting plate 100, which helps to balance the pressure on both sides of the current collecting plate 100 and avoid excessive pressure on any one side; on the other hand, during the liquid injection process, it is also convenient for the electrolyte to enter the side of the current collecting plate 100 where the electrode assembly 300 is located through the blanking groove 101.

[0046] The material drop groove 101 corresponds to the connection position between the collecting plate 100 and the plate 2000 before separation. Fig.11 As shown, the process of blanking and separating the collecting plate 100 from the plate 2000 requires at least a first stamping step M1 and a second stamping step M2, and the blanking groove 101 corresponds to the connection part 2001 between the collecting plate 100 and the plate 2000 after the first stamping step M1 and before the second stamping step M2.

[0047] It should be emphasized that the process of blanking the collecting plate 100 from the plate 2000 here does not refer to the entire process of making the collecting plate 100 on the plate 2000, but only refers to the process of separating the collecting plate 100 from the plate 2000 after forming other structures of the collecting plate 100 (such as weight reduction holes 102 or concave-convex structures for realizing other functions) on the plate 2000.

[0048] In other words, the blanking groove 101 in this embodiment is located in an area corresponding to the connection portion 2001 between the collecting plate 100 and the plate 2000 before the last stamping process (i.e., the second stamping process M2). The connection portion 2001 is the portion removed from the collecting plate 100 in the last stamping process, and, in the circumferential direction of the collecting plate 100, the portion between the collecting plate 100 and the plate 2000 except the connection portion 2001 is a hollow area 2002. For example, the hollow area 2002 can be formed in the previous stamping process (e.g., the first stamping process M1).

[0049] That is to say, in this embodiment, the step of separating the collector plate 100 from the plate 2000 can be divided into at least two steps, wherein after the first step, most of the connection area between the collector plate 100 and the plate 2000 in the circumferential direction is cut off, so that the collector plate 100 and the plate 2000 are connected in the circumferential direction only through the plate 2000 structure surrounded by the blanking groove 101, which greatly reduces the connection area between the collector plate 100 and the plate 2000; after the second step, the part surrounded by the blanking groove 101 is removed from the collector plate 100, and the connection part 2001 between the collector plate 100 and the plate 2000 is disconnected, so that the collector plate 100 is completely separated from the plate 2000. In addition, since the inner side of the collector plate 100 of the blanking groove 101 is concave, the generation of protruding burrs can be avoided.

[0050] Combination Figure 6 and Fig. 9 , the width W1 of the material slot 101 in the circumferential direction of the current collecting plate 100 satisfies: 0.1mm≤W1≤2mm, for example, the value of the width W1 of the material slot 101 in the circumferential direction of the current collecting plate 100 can be 0.1mm, 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm. Of course, the utility model does not limit this, and the width W1 of the material slot 101 in the circumferential direction of the current collecting plate 100 can be reasonably selected within the above range according to actual needs. In this way, it is possible to avoid the width of the blanking groove 101 being too small, for example, when it is less than 0.1 mm, the processing difficulty of the first stamping step M1 is greater, and it is difficult to achieve the purpose of preventing the current collecting plate 100 from being deformed; in addition, it is also possible to avoid the width of the blanking groove 101 being too large, for example, when it is greater than 2 mm, the edge of the current collecting plate 100 is deformed, and too much structure is removed from the current collecting plate 100, which affects the connection between the current collecting plate 100 and the pole ear of the electrode assembly 300 inside the battery 1000. Moreover, when the edge of the current collecting plate 100 is welded to the cover plate 202 of the battery 1000, the influence of setting the blanking groove 101 on the welding area of ​​the current collecting plate 100 and the cover plate 202 can be reduced.

[0051] By setting the width dimension of the blanking groove 101 within the above-mentioned range, the circumferential width of the blanking groove 101 is much smaller than the circumference of the collecting plate 100. When the portion surrounded by the blanking groove 101 serves as the connecting portion 2001 between the collecting plate 100 and the plate 2000 before the last stamping process (i.e., the second stamping process M2), the connecting area between the collecting plate 100 and the plate is reduced. In this way, in the last stamping process of separating the collecting plate 100 from the plate 2000, the stress borne by the edge of the collecting plate 100 is small and deformation is not easy to occur.

[0052] It can be understood that after the first stamping process M1 of separating the collector plate 100 from the plate 2000 is completed, the collector plate 100 is connected to the plate 2000 only through a number of mutually spaced connection parts 2001, so that the connection area between the collector plate 100 and the plate 2000 is greatly reduced, the connection strength is reduced, and it is easier to separate; in the second stamping process M2, the stress of the plate 2000 on the collector plate 100 can be reduced to a large extent, thereby reducing or even eliminating the deformation of the collector plate 100 and ensuring the straightness of the collector plate 100. During the assembly process of the battery 1000, the collector plate 100 with higher processing accuracy is easier to be assembled with other components of the battery 1000, such as the housing 201, with high precision, to ensure the connection quality with other components, thereby ensuring the electrical performance of the battery 1000.

[0053] The collector plate 100 of the embodiment of the utility model is provided with a blanking groove 101 at the edge, and the blanking groove 101 corresponds to the connection part 2001 between the collector plate 100 and the plate 2000 before separation, and the width W1 of the blanking groove 101 in the circumferential direction of the collector plate 100 satisfies: 0.1mm≤W1≤2mm. In this way, the width of the blanking groove 101 in the circumferential direction of the collector plate 100 is much smaller than the circumference of the collector plate 100. Before the blanking groove 101 is formed in the collector plate 100, the collector plate 100 and the plate 2000 are connected only through the plate structure surrounded by the blanking groove 101, and the rest of the parts are separated, so that the connection area between the collector plate 100 and the plate 2000 before separation is greatly reduced, and the connection strength is reduced. In this way, when the collector plate 100 is separated from the plate 2000, the stress of the plate 2000 on the collector plate 100 can be reduced to a large extent, the deformation of the collector plate 100 can be avoided, the straightness of the collector plate 100 can be ensured, and the high-precision assembly of the collector plate 100 in the battery 1000 can be facilitated, thereby ensuring the reliability of the current transmission path inside the battery 1000 and improving the current transmission performance. In addition, since the inner side of the collector plate 100 of the blanking groove 101 is concave, the generation of protruding burrs can be avoided.

[0054] At the same time, a blanking groove 101 is provided to connect the spaces on both sides of the current collecting plate 100 inside the battery 1000, which helps to balance the pressure on both sides of the current collecting plate 100 inside the battery 1000; and during the injection process, the electrolyte can flow into one side of the electrode assembly 300 through the blanking groove 101, which helps to improve the diffusion efficiency of the electrolyte.

[0055] In addition, the connection portion 2001 between the collecting plate 100 and the plate 2000 is punched to form a blanking groove 101 instead of a convex structure, which can avoid burrs on the edge of the collecting plate 100, thereby eliminating the process of cleaning the burrs.

[0056] In some embodiments, in combination Figure 4 , Figure 7 and Fig.10 There are multiple blanking grooves 101, and the multiple blanking grooves 101 are spaced apart along the circumference of the current collecting plate 100. In other words, before the current collecting plate 100 is separated from the plate 2000, there are multiple connection parts 2001 between the current collecting plate 100 and the plate 2000, and in the last stamping process, i.e., the second stamping process, the multiple spaced connection parts 2001 shorten the distance between two adjacent connection parts 2001, and can avoid deformation of the edge of the current collecting plate 100 between two adjacent connection parts 2001, thereby reducing the deformation of the current collecting plate 100 as a whole. Optionally, among the multiple blanking grooves 101, the spacing between any two blanking grooves 101 can be equal or unequal, or can be partially the same and partially different.

[0057] In some embodiments, in combination Figure 4 , Figure 7 and Fig.10 The plurality of blanking grooves 101 are evenly spaced around the collecting plate 100. Thus, in the last stamping process, the uniformity of the force on the collecting plate 100 in the circumferential direction can be improved, thereby greatly reducing the probability of deformation of the collecting plate 100.

[0058] Optionally, the number of the blanking grooves 101 may be 4-8, for example, the number of the blanking grooves 101 may be 4, 5, 6, 7 or 8. Of course, when the area or perimeter of the collecting plate 100 is large, the number of the blanking grooves 101 may also be 10, 12 or more, and this embodiment does not limit this. The number of the blanking grooves 101 should be adjusted according to the spacing between two adjacent blanking grooves 101 to ensure that the edge portion of the collecting plate 100 between two adjacent blanking grooves 101 is not easily deformed during the blanking process.

[0059] It is understandable that, when the area or circumference of the collector plate 100 is constant, when the number of blanking slots 101 is smaller, the interval between two adjacent blanking slots 101 in the circumferential direction is larger, and the portion between the two blanking slots 101 is more likely to deform; when the number of blanking slots 101 is larger, the effect of reducing the deformation of the collector plate 100 is not significantly improved, and it may cause the burrs on the edge of the collector plate 100 to increase, cutting the pole lugs. In this embodiment, the number of blanking slots 101 is limited to 4-8, which can prevent the collector plate 100 from deforming and avoid the burrs on the edge of the collector plate 100 from increasing and cutting the pole lugs.

[0060] In some embodiments, in combination Figure 6 and Fig. 9, the width W1 of the blanking groove 101 in the circumferential direction of the current collecting plate 100 satisfies: 0.5mm≤W1≤1.5mm. For example, the width W1 of the blanking groove 101 in the circumferential direction of the current collecting plate 100 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm. Of course, the utility model does not limit this. The width W1 of the blanking groove 101 in the circumferential direction of the current collecting plate 100 can be reasonably selected within the above range according to actual needs. In this way, it is possible to better balance the difficulty of stamping and reduce the deformation of the current collecting plate 100. In addition, the connection reliability between the current collecting plate 100 and the pole ears of the electrode assembly 300 inside the battery 1000 can also be ensured.

[0061] In some embodiments, in combination Figure 6 and Fig. 9 , the depth H1 of the blanking groove 101 along the opening direction can satisfy: 0.05mm≤H1≤5mm, wherein the opening direction is parallel to the straight surface on any side of the collecting plate 100 along the thickness direction. For example, the blanking groove 101 can be opened along the radial direction of the collecting plate 100. At this time, the depth H1 of the blanking groove 101 in the radial direction of the collecting plate 100 can be 0.05mm, 0.1mm, 0.2mm, 0.5mm, 1mm, 2mm, 3mm, 4mm or 5mm. Of course, the utility model does not limit this. The depth H1 of the blanking groove 101 can be reasonably selected within the above range according to actual needs. Preferably, 0.05mm≤H1≤2mm. In this way, it is possible to avoid the depth of the blanking groove 101 being too small, for example, when it is less than 0.05 mm, it will lead to greater processing difficulty, thus making it difficult to achieve the purpose of preventing the current collecting plate 100 from deforming; in addition, it is also possible to avoid the depth of the blanking groove 101 being too large, for example, when it is greater than 5 mm, it will lead to too much structure of the current collecting plate 100 being removed, affecting the connection between the current collecting plate 100 and the pole ears of the electrode assembly 300 inside the battery 1000, and when the edge of the current collecting plate 100 is welded to the cover plate 202 of the battery 1000, the impact on the welding area of ​​the current collecting plate 100 and the cover plate 202 can be reduced, thereby avoiding the welding energy from reaching the electrode assembly 300 through the blanking groove 101, causing damage to the electrode assembly 300.

[0062] It can be understood that since the width W1 and the depth H1 of the blanking groove 101 both affect the actual area of ​​the blanking groove 101, the present embodiment can ensure that the blanking groove 101 has a suitable area by jointly regulating the above two parameters, taking into account both the processing accuracy and processing difficulty of the collecting plate 100 itself, and ensuring the connection accuracy and assembly difficulty between the collecting plate 100 and other components inside the battery 1000.

[0063] In some embodiments, the slot wall of the blanking trough 101 is at least one of an arc surface and a flat surface. For example, the blanking trough 101 can be in an arc shape, in which case the slot wall of the blanking trough 101 is an arc surface; or, the blanking trough 101 can be in a U shape, in which case the slot wall of the blanking trough 101 includes an arc surface and flat surfaces located on both sides of the arc surface; or, the blanking trough 101 can be in a V shape, in which case the slot wall of the blanking trough 101 includes two flat surfaces opposite to each other in the circumferential direction. Of course, the present invention does not limit this, and the shape of the blanking trough 101 can also be any shape. In this way, the structure of the blanking trough 101 is relatively simple, and the forms are diverse, which is convenient for processing.

[0064] In some embodiments, reference Fig.12 , the current collecting plate 100 includes a first surface 106 and a second surface 107 that are opposite to each other in the thickness direction, the first surface 106 is arranged toward the electrode assembly 300 of the battery 1000, and the second surface 107 can be arranged toward the cover plate 202 of the battery 1000, and the connection between the groove wall of the blanking groove 101 and the first surface 106 has a chamfered structure 108 formed by stamping. In other words, in the second stamping process M2 of this embodiment, during stamping, pressure is applied from the first surface 106 side to the second surface 107 side, so that the chamfered structure 108 is formed at the connection between the groove wall of the blanking groove 101 and the first surface 106. It can be understood that during stamping, the material of the current collecting plate 100 flows from the first surface 106 to the second surface 107 side, and a burr structure may be formed at the connection between the groove wall of the blanking groove 101 and the second surface 107. Since the chamfered structure is formed on the first surface 106 side, the burr structure can be avoided from facing the electrode assembly 300, thereby preventing the electrode assembly 300 from being damaged.

[0065] In some embodiments, in combination Figure 4 and Fig.10 , the current collecting plate 100 is provided with a weight-reducing hole 102, and there may be multiple weight-reducing holes 102, and the weight-reducing holes 102 penetrate the current collecting plate 100 along the thickness direction of the current collecting plate 100, and the weight-reducing holes 102 may be square, circular, triangular, regular or any irregular shape. Multiple weight-reducing holes 102 are arranged at intervals around the central area 104 of the current collecting plate 100, where the central area 104 of the current collecting plate 100 includes the central point of the current collecting plate 100 and the area around the central point within a certain distance from the central point, and the central area 104 can be used for welding with the cover plate 202 of the battery 1000. Among them, the weight-reducing holes 102 can be formed by a punching process. By providing the weight-reducing holes 102, the weight of the current collecting plate 100 can be reduced, and after the current collecting plate 100 is assembled to the battery 1000, the weight of the battery 1000 can be reduced. In addition, the provision of the blanking trough 101 also helps to reduce the weight of the current collecting plate 100.

[0066] In addition, the weight-reducing holes 102 can be used to connect the internal spaces of the battery 1000 on both sides of the current collecting plate 100. When gas is generated inside the battery 1000, the gas flow on both sides of the current collecting plate 100 is facilitated to prevent the gas pressure on one side of the current collecting plate 100 from increasing and affecting the internal circuit.

[0067] The collecting plate 100 may include a connecting arm 103 located on the side of the lightening hole 102 facing away from the central area 104. The connecting arm 103 here refers to the edge portion of the collecting plate 100 located radially outside the lightening hole 102 when the collecting plate 100 is punched. The connecting arm 103 can connect the portions of the collecting plate 100 located on both sides of the lightening hole 102 along the circumferential direction. Since the structural strength of the connecting arm 103 is reduced after the lightening hole 102 is formed, deformation is prone to occur there. Therefore, in order to reduce the deformation of the area around the lightening hole 102 including the connecting arm 103 when the collecting plate 100 is separated from the plate 2000, a blanking groove 101 may be provided on the outer edge of the connecting arm 103 in this embodiment. The outer edge of the connecting arm 103 may be provided with one blanking groove 101 or with multiple blanking grooves 101 arranged at intervals. Multiple refers to two or more. In this way, when the weight-reducing hole 102 is provided on the current collecting plate 100, the deformation of the area around the weight-reducing hole 102, especially the connection arm 103, can be reduced, thereby improving the processing accuracy and quality of the current collecting plate 100. Optionally, when the blanking groove 101 is provided on the connection arm 103, the blanking groove 101 may also be provided in the area outside the connection arm 103 at the edge of the current collecting plate 100, or the blanking groove 101 may not be provided.

[0068] Among them, combined Figure 5 and Figure 8 The central area 104 of the current collecting disk 100 may be provided with a thickened portion 105. When the battery 1000 uses the cover plate 202 as the negative electrode, the cover plate 202 may be welded to the thickened portion 105 of the current collecting disk 100, such as by laser penetration welding. The thickness of the thickened portion 105 is greater than the thickness of the remaining parts of the current collecting disk 100. During welding, the current collecting disk 100 can be prevented from being welded through, thereby preventing the electrode assembly 300 from being damaged.

[0069] The thickened portion 105 may be integrally formed with the current collecting plate 100; alternatively, the thickened portion 105 may be formed by combining the current collecting plate 100 and SPCC (generally cold-rolled carbon steel sheets and steel strips) made of different materials into one body through a composite process.

[0070] In some embodiments, in combination Figure 4 and Fig.10 The inner wall of the weight-reducing hole 102 includes at least one positioning edge 1021. The positioning edge 1021 can extend along a straight line or along a curve, preferably along a straight line, that is, the positioning edge 1021 is a straight edge. Fig.10 As shown. The positioning edges 1021 of the plurality of weight-reducing holes 102 are symmetrically distributed about the central area 104. For example Fig.10 As shown, four weight reduction holes 102 are arranged on the collecting plate 100, and the four weight reduction holes 102 are symmetrically distributed. There is a symmetrical center line between any two adjacent weight reduction holes 102, and each weight reduction hole 102 includes two positioning edges 1021, wherein one positioning edge 1021 is parallel to the symmetrical center line between the two weight reduction holes 102, and the other positioning edge 1021 is perpendicular to the symmetrical center line between the two weight reduction holes 102; the two positioning edges 1021 of any weight reduction hole 102 are symmetrical about the center line of the weight reduction hole 102.

[0071] During the assembly process of the battery 1000, the assembly equipment can first determine the positions of the positioning edges 1021 of the multiple weight-reducing holes 102, and then determine the center point of the current collecting plate 100 based on the positions of the multiple positioning edges 1021. For example, the center point of the current collecting plate 100 is calculated and analyzed based on the angles, spacings, sizes or other parameters of the multiple positioning edges 1021, and then the current collecting plate 100 is grabbed and moved to the inside of the outer shell 201 of the battery 1000, so that the center point of the current collecting plate 100 is aligned with the central axis of the outer shell 201, thereby ensuring that the current collecting plate 100 is assembled to the target position.

[0072] In the present embodiment, a blanking groove 101 is provided on the connecting arm 103 outside the weight-reducing hole 102. The blanking groove 101 avoids deformation of the area around the weight-reducing hole 102 during the separation of the collecting plate 100 from the plate 2000. Therefore, the position accuracy of the positioning edge 1021 can be ensured not to be affected, and the calculation accuracy of the center point of the collecting plate 100 can be ensured to ensure the assembly accuracy of the collecting plate 100 in the battery 1000, thereby ensuring the welding quality of the collecting plate 100 and other components of the battery 1000 (such as the pole ears of the electrode assembly 300, the cover plate 202, etc.) to ensure the electrical performance of the battery 1000.

[0073] Optionally, combined Figure 4 and Fig.10 The weight-reducing hole 102 further includes a transition edge 1022 between the two positioning edges 1021. The transition edge 1022 may be a straight extension or an arc extension. Both ends of the transition edge 1022 are respectively connected to the two positioning edges 1021, that is, the two positioning edges 1021 are separated by the transition edge 1022 to prevent the deformation of one of them from causing the other to deform.

[0074] The battery 1000 according to the second embodiment of the present invention is described below.

[0075] The battery 1000 of this embodiment includes: a housing assembly 200, an electrode assembly 300 and the current collecting plate 100 in the above embodiment.

[0076] The shell assembly 200 defines a accommodating cavity. For example, the shell assembly 200 may include a shell 201 and a cover plate 202, wherein the shell 201 is cylindrical with an opening at one end, and the cover plate 202 seals the opening. The cover plate 202 and the shell 201 may define a accommodating cavity together.

[0077] The electrode assembly 300 may include a positive electrode sheet, a negative electrode sheet and a separator, wherein the positive electrode sheet may include a positive electrode current collector and a positive electrode active layer coated on the surface of the positive electrode current collector, and the negative electrode sheet may include a negative electrode current collector and a negative electrode active layer coated on the surface of the negative electrode current collector. The positive electrode sheet, the separator and the negative electrode sheet are stacked and arranged in sequence and then wound to form a wound electrode assembly 300. The electrode assembly 300 is disposed in the accommodating cavity, and a pole ear is disposed at one end of the electrode assembly 300, for example, the pole ear may be disposed at one end of the electrode assembly 300 facing the cover plate 202.

[0078] The current collecting plate 100 is disposed at one end of the electrode assembly 300 where the electrode tab is disposed, and is electrically connected to the electrode tab. Thus, the current collecting plate 100 can realize the function of collecting the electrode assembly 300, so as to facilitate current transmission between the battery 1000 and the external circuit.

[0079] Optionally, the collecting plate 100 may be welded to the cover plate 202, in which case the cover plate 202 is electrically charged; the collecting plate 100 may also be insulated from the cover plate 202, in which case the cover plate 202 is not electrically charged.

[0080] Since the positive electrode collector 400 is connected to the pole 500 of the battery 1000 on the positive electrode side of the battery 1000, the above-mentioned collector 100 can be used as the negative electrode collector 100 of the battery 1000, and the above-mentioned pole ear is the negative pole ear of the battery 1000, that is, the negative pole ear is arranged at one end of the electrode assembly 300 facing the negative electrode collector 100 and the cover plate 202. Correspondingly, the battery 1000 may also include a positive pole ear, which is arranged at one end of the electrode assembly 300 facing the positive electrode collector 400 and the pole 500.

[0081] The battery 1000 of this embodiment is provided with the current collecting plate 100 in the above embodiment. Since the processing precision of the current collecting plate 100 is high, it is beneficial to

[0082] The high-precision assembly of the current collecting plate 100 and the housing 201 and other components is achieved, thereby ensuring the reliability of the current transmission path inside the battery 1000 and improving the electrical performance of the battery 1000. In addition, the spaces on both sides of the current collecting plate 100 can be connected through the blanking groove 101, which helps to balance the pressure on both sides of the current collecting plate 100 inside the battery 1000; and during the injection process, the electrolyte can flow into one side of the electrode assembly 300 through the blanking groove 101, which helps to improve the diffusion efficiency of the electrolyte.

[0083] In some embodiments, the housing 201 includes a top wall 2011 opposite to the cover plate 202 and a side wall 2012 surrounding the top wall 2011, the top wall 2011 and the side wall 2012 are integrally formed, and the battery 1000 may also include a pole 500 and a positive current collector 400, the pole 500 is penetrated through the top wall 2011, and the pole 500 is separated from the housing 201 by an insulating component to achieve insulation. The battery 1000 also includes a positive current collector 400 and a pole 500, and the end of the electrode assembly 300 facing the pole 500 includes a positive electrode ear, and the positive electrode ear and the pole 500 are electrically connected by welding through the positive current collector 400. In this way, the positive electrode side structure of the battery 1000 is relatively simple and easy to implement.

[0084] The electronic device according to the third embodiment of the present invention is described below.

[0085] The electronic device of this embodiment can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.: the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.: the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and an electric tool for railways, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. The electronic device can also be a battery pack, a battery module, etc. The embodiment of the present application does not impose any special restrictions on the above-mentioned electronic devices.

[0086] Specifically, the electronic device may include a device body and the battery 1000 in the above embodiment. The device body is provided with a battery compartment, and a power supply interface may be provided in the battery compartment. The battery 1000 may be arranged in the battery compartment and electrically connected to the power supply interface. In this way, the battery 1000 can power the electronic device.

[0087] According to the electronic device of the embodiment of the utility model, when the battery 1000 in the above embodiment is used, the electrical performance of the battery 1000 is better, and it can more reliably supply power to the electronic device, which is beneficial to improving the user experience.

[0088] It should be noted that the embodiments represented by "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.

[0089] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0090] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0091] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A collecting plate, characterized in that: The collecting plate is formed by stamping a plate, and a blanking groove is provided at the edge of the collecting plate. The blanking groove penetrates the collecting plate along the thickness direction of the collecting plate. The blanking groove corresponds to the connection position between the current collecting plate and the plate before separation, and the width W1 of the blanking groove in the circumferential direction of the current collecting plate satisfies: 0.1 mm≤W1≤2 mm.

2. The collecting plate according to claim 1, characterized in that: There are a plurality of the material dropping grooves, and the plurality of the material dropping grooves are distributed at intervals along the circumference of the collecting plate.

3. The collecting plate according to claim 2, characterized in that: The plurality of material dropping grooves are distributed at equal intervals in the circumferential direction of the current collecting plate.

4. The collecting plate according to claim 1, characterized in that: A width W1 of the blanking groove in the circumferential direction of the collecting plate satisfies: 0.5 mm ≤ W1 ≤ 1.5 mm.

5. The collecting plate according to claim 1, characterized in that: The depth H1 of the blanking groove along the opening direction satisfies: 0.05mm≤H1≤2mm, and the opening direction is parallel to the flat surface on any side of the collecting plate along the thickness direction.

6. The collecting plate according to claim 1, characterized in that: The current collecting plate includes a first surface and a second surface opposite to each other in a thickness direction, wherein the first surface is disposed toward the electrode assembly of the battery. A connection between the slot wall of the blanking slot and the first surface has a chamfered structure formed by stamping.

7. The collecting plate according to claim 1, characterized in that: The current collecting plate is provided with a plurality of weight-reducing holes, and the plurality of weight-reducing holes are arranged at intervals around the central area of ​​the current collecting plate. The collecting plate comprises a connecting arm located on a side of the lightening hole facing away from the central area, and the material dropping groove is located on an outer edge of the connecting arm.

8. The collecting plate according to claim 7, characterized in that: The inner wall of the weight-reducing hole includes at least one positioning edge, and the positioning edges of the plurality of weight-reducing holes are symmetrically distributed about the central area.

9. A battery, characterized in that: include: A housing assembly, wherein the housing assembly defines a receiving cavity; An electrode assembly, wherein the electrode assembly is disposed in the accommodating cavity, and an electrode ear is disposed at one end of the electrode assembly; The current collecting disk according to any one of claims 1 to 8, wherein the current collecting disk is disposed at one end of the electrode assembly where the electrode tab is disposed, and is electrically connected to the electrode tab.

10. An electronic device, characterized in that: include: The battery according to claim 9.

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