Collector plate, battery and electronic device

Abstract

The utility model provides a collector plate, battery and electronic device relates to battery technical field, collector plate includes: edge fixed part, cover plate connecting part, transition connecting arm and tab connecting part, the cover plate connecting part is located in the middle area of collector plate, the edge fixed part is located the radial outside of cover plate connecting part, and the tab connecting part is located in the middle area of collector plate connecting part. The edge fixing part and the cover plate connecting part are spaced in the radial direction, and the transition connecting arm is connected between the edge fixing part and the cover plate connecting part; the tab connecting part is arranged on one of the edge fixing part and the cover plate connecting part and is separated from the other one, and the tab connecting part and the transition connecting arm are arranged at intervals along the circumferential direction of the cover plate connecting part. According to the collector plate disclosed by the utility model, when the cover plate connecting part and the cover plate protrude outwards due to the increase of internal air pressure of the battery, the pulling force of the collector plate on the tabs can be reduced or even eliminated, the connection stability of the collector plate and an electrode assembly is ensured, and the electrical property of the battery is improved.

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, more and more electrical equipment uses batteries as energy storage and supply devices, such as new energy vehicles, communication base stations, energy storage containers, etc.

[0003] When the battery is working, the internal electrolyte will produce gas. When the internal gas pressure of the battery reaches a certain level, it will cause the cover to bulge outward. Since the current collecting plate is welded to the cover and the pole ear of the electrode assembly respectively, the bulging cover causes the current collecting plate to pull the pole ear, which may cause the connection stability between the current collecting plate and the pole ear to decrease, or even cause the pole ear to break, affecting the electrical performance of the battery. Utility Model Content

[0004] In view of the above problems, the utility model provides a collecting plate, a battery and an electronic device, which can reduce or even eliminate the pulling force of the collecting plate on the electrode ear when the cover plate connecting portion and the cover plate bulge outward due to the increase of internal air pressure of the battery, thereby ensuring the connection stability between the collecting plate and the electrode assembly and improving the electrical performance of the battery.

[0005] The utility model provides a current collecting disk for a battery, the current collecting disk comprising: an edge fixing portion, a cover plate connecting portion, a transition connecting arm and a pole ear connecting portion, the cover plate connecting portion is located in the middle area of ​​the current collecting disk, the edge fixing portion is located radially outside the cover plate connecting portion, the edge fixing portion is radially spaced apart from the cover plate connecting portion, the transition connecting arm is connected between the edge fixing portion and the cover plate connecting portion; the pole ear connecting portion is provided on one of the edge fixing portion and the cover plate connecting portion and is spaced apart from the other, and the pole ear connecting portion and the transition connecting arm are spaced apart along the circumference of the cover plate connecting portion.

[0006] In some embodiments, a buffer structure is provided on the transition connecting arm, and the buffer structure is configured to buffer the force exerted by the cover plate connecting portion on the edge fixing portion.

[0007] In some embodiments, the buffer structure is formed by a partial structure of the transition connecting arm being recessed along the axial direction of the collecting plate.

[0008] In some embodiments, the buffer structure is formed in an arc shape extending along the circumference of the collecting plate.

[0009] In some embodiments, at least part of the structure of the cover plate connecting portion constitutes a thickened structure, the thickened structure is welded to the cover plate of the battery, and the thickness T1 of the thickened structure ranges from 0.2 mm ≤ T1 ≤ 1.8 mm.

[0010] In some embodiments, the thickness T2 of the edge fixing portion ranges from 0.1 mm ≤ T2 ≤ 0.6 mm.

[0011] In some embodiments, the tab connection portion is connected to the cover plate connection portion.

[0012] In some embodiments, the diameter D3 of the radial outer edge of the tab connection portion has a value range of 30 mm ≤ D3 ≤ 39 mm.

[0013] In some embodiments, the tab connecting portion is connected to the edge fixing portion.

[0014] In some embodiments, there are multiple pole lug connecting parts, and the multiple pole lug connecting parts are arranged at intervals along the circumference of the cover plate connecting part, a gap is formed between two adjacent pole lug connecting parts, and the transition connecting arm is arranged in at least one of the multiple gaps.

[0015] The second aspect of the present invention provides a battery, comprising: a shell assembly, comprising an outer shell and a cover plate, the outer shell defining a accommodating cavity with an opening at one end, and the cover plate sealing the opening; an electrode assembly, the electrode assembly is arranged in the accommodating cavity, and the electrode assembly is provided with a pole ear at one end facing the cover plate; according to the current collecting plate described in the first aspect of the present invention, the cover plate connecting portion of the current collecting plate is welded to the cover plate, and the pole ear connecting portion is welded to the pole ear.

[0016] The third aspect of the present invention provides an electronic device, comprising: the battery described in the second aspect of the present invention.

[0017] According to the collector disk of the utility model, the edge fixing part and the cover plate connecting part are radially spaced apart, the pole ear connecting part is connected to one of the edge fixing part and the cover plate connecting part, and the pole ear connecting part and the transition connecting arm are arranged at intervals along the circumference of the cover plate connecting part. In this way, under the premise of ensuring that the cover plate and the electrode assembly are electrically connected through the collector disk, the pole ear connecting part is arranged at the edge fixing part or at the cover plate connecting part, which can reduce or even eliminate the pulling force of the collector disk on the pole ear when the cover plate connecting part and the cover plate bulge outward due to the increase of the internal gas pressure of the battery, avoid the situation that the pole ear is damaged and fractured due to the pulling effect, ensure the connection stability of the collector disk and the electrode assembly, thereby ensuring the current flow capacity and improving the battery electrical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 It is a schematic diagram of the structure of batteries in some embodiments of the utility model;

[0020] Figure 2 For along Figure 1 Sectional view of the AA section;

[0021] Figure 3 for Figure 2 The middle circle shows an enlarged view of site B;

[0022] Figure 4 It is a schematic diagram of the structure of the current collecting plate of some embodiments of the utility model;

[0023] Figure 5 It is a schematic diagram of the structure of the current collecting plate of some embodiments of the utility model;

[0024] Figure 6 For along Figure 5 Sectional view of the CC section;

[0025] Figure 7 for Figure 6 The middle circle shows an enlarged view of site D;

[0026] Figure 8 It is a schematic diagram of the structure of the current collecting plate of other embodiments of the utility model;

[0027] Fig. 9 It is a schematic diagram of the structure of the current collecting plate of some other embodiments of the utility model;

[0028] Fig.10 It is a schematic structural diagram of the current collecting disk of some other embodiments of the utility model.

[0029] Description of reference numerals:

[0030] 100-battery;

[0031] 1- Collecting plate;

[0032] 11-edge fixing part; 12-cover plate connecting part; 121-thickening structure;

[0033] 13-transition connecting arm; 131-buffer structure;

[0034] 14-ear connection portion;

[0035] 2-Electrode assembly;

[0036] 3-shell assembly; 31-housing; 32-cover plate; 321-boss structure. DETAILED DESCRIPTION

[0037] 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.

[0038] With the development of social economy, more and more electrical equipment uses batteries as energy storage and supply devices, such as new energy vehicles, communication base stations, energy storage containers, etc. With the development of social economy, more and more electrical equipment uses batteries as energy storage and supply devices, such as new energy vehicles, communication base stations, energy storage containers, etc. When the battery is working, the internal electrolyte will produce gas. When the internal gas pressure of the battery reaches a certain level, it will cause the cover plate to bulge outward. Since the collector plate is welded to the cover plate and the pole ears of the electrode assembly respectively, the bulging of the cover plate will cause the collector plate to pull on the pole ears, which may cause the connection stability between the collector plate and the pole ears to decrease, or even cause the pole ears to break, affecting the electrical performance of the battery.

[0039] In view of this, the present embodiment provides a current collecting plate 1, which can be used for a battery 100. The outer contour of the current collecting plate 1 is adapted to the outer shell 31 of the battery 100, so as to facilitate assembly with the outer shell 31. For example, when the outer shell 31 is square, the outer contour of the current collecting plate 1 can be formed into a square; when the outer shell 31 is circular, the outer contour of the current collecting plate 1 can be circular. For ease of description, the following description is based on the example that the battery 100 is a cylindrical battery 100 and the current collecting plate 1 is circular.

[0040] Specifically, combined Figure 4-Figure 10 The current collecting plate 1 of this embodiment may include: an edge fixing portion 11, a cover plate connecting portion 12, a transition connecting arm 13 and a pole ear connecting portion 14.

[0041] Among them, combined Figure 4 as well as Figure 8-Figure 10, the cover plate connection part 12 is in the middle area of ​​the current collecting disk 1, and the cover plate connection part 12 can be connected to the cover plate 32 of the battery 100, for example, by welding, and the welding method can be ultrasonic welding, laser penetration welding, etc. The edge fixing part 11 is radially outside the cover plate connection part 12, and the edge fixing part 11 is radially spaced apart from the cover plate connection part 12. For example, the edge fixing part 11 can be formed into a circular ring, and the edge fixing part 11 is located on the outside of the cover plate connection part 12. The outer contour of the edge fixing part 11 and the outer contour of the cover plate connection part 12 can form concentric circles. When the battery 100 is assembled, the edge fixing part 11 can abut against the boss structure 321 at the edge of the cover plate 32, so that the edge fixing part 11 is clamped between the boss structure 321 and the electrode assembly 2, thereby fixing the current collecting disk 1.

[0042] The transition connecting arm 13 may have a square, fan-shaped or any other shape as its outline. The transition connecting arm 13 is connected between the edge fixing portion 11 and the cover plate connecting portion 12, that is, the transition connecting arm 13 has a first end and a second end that are radially opposite to each other, wherein the first end is connected to the cover plate connecting portion 12, and the second end is connected to the edge fixing portion 11, so as to ensure that the cover plate connecting portion 12 and the edge fixing portion 11 are integrated, and the edge fixing portion 11 can better support the cover plate connecting portion 12.

[0043] It can be understood that since the edge fixing portion 11 and the cover plate connecting portion 12 are connected only by the transition connecting arm 13, the edge fixing portion 11 and the cover plate connecting portion 12 are spaced apart in the circumferential direction except for the transition connecting arm 13. In this way, under the premise of ensuring the connection between the edge fixing portion 11 and the cover plate connecting portion 12, the connection strength between the edge fixing portion 11 and the cover plate connecting portion 12 can be reduced. Compared with the solution in which the collecting plate 1 is a continuous surface, when the cover plate connecting portion 12 is deformed and moved with the cover plate 32, the force and influence of the cover plate connecting portion 12 on the edge fixing portion 11 can be reduced, and the edge fixing portion 11 can be more easily maintained in its position.

[0044] The tab connection portion 14 can be electrically connected to the tab of the electrode assembly 2, for example, by welding. The tab connection portion 14 is provided on one of the edge fixing portion 11 and the cover plate connection portion 12, and is separated from the other. In this case, the tab connection portion 14 is located between the edge fixing portion 11 and the cover plate connection portion 12. For example, the tab connection portion 14 can be connected only to the edge fixing portion 11, in which case the tab connection portion 14 is separated from the cover plate connection portion 12; or, the tab connection portion 14 can be connected only to the cover plate connection portion 12, in which case the tab connection portion 14 is separated from the edge fixing portion 11. In addition, the tab connection portion 14 and the transition connection arm 13 are arranged at intervals along the circumference of the cover plate connection portion 12. Since only one radial end of the tab connection portion 14 is connected to other structures (such as the cover plate connection portion 12 or the edge fixing portion 11), and the other radial end and both sides along the circumference are separated from other structural parts of the collector plate 1, the tab connection portion 14 is formed into a cantilever structure.

[0045] Among them, when the pole lug connection part 14 is arranged on the edge fixing part 11, since the pole lug connection part 14 and the transition connection arm 13 are spaced apart in the circumferential direction, and the transition connection arm 13 can reduce and buffer the force of the cover plate connection part 12 on the edge fixing part 11, therefore, when the internal air pressure of the battery 100 increases and causes the cover plate 32 to bulge outward, even if the cover plate connection part 12 bulges outward with the cover plate 32, the position of the pole lug connection part 14 can also be kept stable, avoiding the pole lug connection part 14 from pulling the pole lug, thereby ensuring the connection stability between the collecting plate 1 and the electrode assembly 2, ensuring the current passing capacity, and improving the electrical performance of the battery 100.

[0046] When the tab connection part 14 is provided on the cover plate connection part 12, since the tab connection part 14 and the transition connection arm 13 are arranged at intervals in the circumferential direction, compared with the scheme in which the entire surface of the collector plate 1 is connected to the tab, the tab connection part 14 of this embodiment is formed into a cantilever structure, and the strength of the tab connection part 14 is greatly reduced. In this way, even if the cover plate connection part 12 bulges outward with the cover plate 32, it will drive the tab connection part 14, but due to the reduced strength of the tab connection part 14, the pulling force of the tab connection part 14 on the tab is smaller, which helps to reduce the pulling force of the collector plate 1 on the tab as a whole, thereby improving the connection stability between the collector plate 1 and the tab, and ensuring the electrical performance of the battery 100.

[0047] According to the collector 1 of the embodiment of the utility model, the edge fixing portion 11 and the cover plate connecting portion 12 are spaced apart in the radial direction, the pole ear connecting portion 14 is connected to one of the edge fixing portion 11 and the cover plate connecting portion 12, and the pole ear connecting portion 14 and the transition connecting arm 13 are arranged at intervals along the circumference of the cover plate connecting portion 12. In this way, under the premise of ensuring that the cover plate 32 and the electrode assembly 2 are electrically connected through the collector 1, the pole ear connecting portion 14 is arranged at the edge fixing portion 11 or at the cover plate connecting portion 12, which can reduce or even eliminate the pulling force of the collector 1 on the pole ear when the cover plate connecting portion 12 and the cover plate 32 bulge outward due to the increase of the internal air pressure of the battery 100, avoid the situation that the pole ear is damaged and fractured due to the pulling effect, ensure the connection stability of the collector 1 and the electrode assembly 2, thereby ensuring the current flow capacity and improving the electrical performance of the battery 100.

[0048] In some embodiments, reference Figure 4-Figure 7 , a buffer structure 131 is provided on the transition connecting arm 13, and the buffer structure 131 is configured to buffer the force of the cover plate connecting portion 12 on the edge fixing portion 11. For example, the buffer structure 131 can be configured to have a thickness smaller than the thickness of other parts of the transition connecting arm 13, so as to reduce the strength of the buffer structure 131 and enhance its buffering capacity; or, the buffer structure 131 can be formed into a concave-convex structure so that it has a certain deformability in the radial direction. In this way, when the electrolyte generates gas inside the battery 100, causing the cover plate 32 and the cover plate connecting portion 12 directly connected to the cover plate 32 to bulge outward, the buffer structure 131 can buffer the force of the cover plate connecting portion 12 on the edge fixing portion 11 through its own deformation.

[0049] In some embodiments, reference Figure 4-Figure 7 , the buffer structure 131 is formed by a partial structure of the transition connecting arm 13 being recessed along the axial direction of the collecting plate 1. In other words, the buffer structure 131 is formed as a groove structure. For example, the buffer structure 131 can be arranged adjacent to the edge fixing portion 11, or the buffer structure 131 can also be arranged in the middle of the transition connecting arm 13 in the radial direction. Of course, the present application does not limit this, and the position of the buffer structure 131 on the transition connecting arm 13 can be reasonably set according to actual needs. In this way, when the cover plate connecting portion 12 pulls the transition connecting arm 13 as the cover plate 32 bulges outward, the buffer structure 131 can provide a certain deformation margin for the transition connecting arm 13, offset the tension of the cover plate connecting portion 12, and isolate the tension of the cover plate connecting portion 12 on the edge fixing portion 11.

[0050] In some embodiments, reference Figure 7, the height H1 of the buffer structure 131 along the axial direction of the current collecting disk 1 has a value range of: 1mm-3mm. For example, the height H1 of the buffer structure 131 along the axial direction of the current collecting disk 1 can be 1mm, 1.5mm, 2mm, 2.5mm or 3mm. Of course, the present application does not impose any restrictions on this, and the height of the buffer structure 131 can be reasonably selected within the above range according to actual needs. In this way, it is avoided that when the height of the buffer structure 131 is too large, it occupies too much internal space of the battery 100, which is not conducive to improving the energy density of the battery 100; it is also avoided that the height of the buffer structure 131 is too small, which cannot effectively play the role of buffering the pulling force of the cover plate connecting part 12 on the edge fixing part 11.

[0051] In some embodiments, in combination Figure 4-Figure 6 The buffer structure 131 is formed into an arc extending along the circumference of the collecting plate 1, so that the tension of the cover plate connecting portion 12 can act evenly on the buffer structure 131, so that the buffer structure 131 is evenly deformed, thereby improving the buffering effect on the tension of the cover plate connecting portion 12. When the pole ear connecting portion 14 is arranged on the edge fixing portion 11, the influence of the deformation of the cover plate connecting portion 12 on the pole ear connecting portion 14 can be better isolated.

[0052] In some embodiments, reference Figure 5 , the value range of the inner diameter D1 of the buffer structure 131 is: 30mm≤D1≤38mm, where the inner diameter D1 of the buffer structure 131 is the diameter of the radial inner edge of the buffer structure 131, for example, the value of the inner diameter D1 of the buffer structure 131 can be 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm or 38mm, preferably, the inner diameter D1 of the buffer structure 131 is 33mm-36mm. Of course, the utility model does not limit this, and the inner diameter D1 of the buffer structure 131 can be reasonably selected within the above range according to actual conditions.

[0053] The value range of the outer diameter D2 of the buffer structure 131 is: 32mm≤D2≤40mm, where the outer diameter D2 of the buffer structure 131 is the diameter of the radial outer edge of the buffer structure 131, for example, the value of the outer diameter D2 of the buffer structure 131 can be 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm or 40mm, preferably, the outer diameter D2 of the buffer structure 131 is 35mm-38mm. Of course, the utility model does not limit this, and the outer diameter D2 of the buffer structure 131 can be reasonably selected within the above range according to actual conditions.

[0054] It can be understood that the outer diameter D2 of the buffer structure 131 is always greater than its inner diameter D1, and the minimum width of the buffer structure 131 is 2 mm. In this way, it can be ensured that the buffer structure 131 has a sufficient width to have sufficient buffering capacity for the pulling force on one side of the cover plate connecting portion 12, and better reduce the force of the cover plate connecting portion 12 on the pole lug connecting portion 14, thereby reducing the pulling effect of the pole lug connecting portion 14 on the pole lug, and ensuring the connection stability between the collector plate 1 and the pole lug.

[0055] In some embodiments, reference Figure 4 as well as Figure 8-Figure 10 , at least part of the structure of the cover plate connection part 12 constitutes a thickened structure 121, and the thickened structure 121 can be used as a welding area of ​​the cover plate connection part 12 and welded to the cover plate 32 of the battery 100. For example, the thickened structure 121 can be located in an area on the cover plate connection part 12 close to the central axis of the current collecting disk 1, and the thickness of the thickened structure 121 is greater than the thickness of other parts of the current collecting disk 1. By providing the thickened structure 121 on the cover plate connection part 12, when the cover plate 32 and the current collecting disk 1 are welded by laser penetration welding, the thickened structure 121 can prevent the current collecting disk 1 from being welded through, thereby preventing damage to the electrode assembly 2.

[0056] Optionally, the thickened structure 121 can be made of the same material as the collecting plate 1 and be integrally formed; or, the thickened structure 121 is formed by compounding a cold-rolled steel plate to the cover plate connecting portion 12 of the collecting plate 1. For example, the cold-rolled steel plate can be a generally used cold-rolled carbon steel sheet and steel strip (SPCC). The thickened structure 121 uses this material, which makes it easier to weld the collecting plate 1 to the cover plate 32.

[0057] refer to Figure 6 , the thickness T1 of the thickened structure 121 has a value range of: 0.2mm≤T1≤1.8mm. For example, the thickness T1 of the thickened structure 121 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.5mm or 1.8mm. Preferably, the thickness T1 of the thickened structure 121 is 0.4mm-1.5mm. Of course, the utility model does not limit this, and the thickness of the thickened structure 121 can be reasonably set according to actual needs. To ensure that the thickened structure 121 is not welded through when being welded to the cover plate 32, so as to better protect the electrode assembly 2 when the collecting plate 1 is welded to the cover plate 32, and improve the welding quality.

[0058] In some embodiments, reference Figure 6, the value range of the thickness T2 of the edge fixing portion 11 is: 0.1mm≤T2≤0.6mm, for example, the thickness T2 of the edge fixing portion 11 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, preferably, the thickness T2 of the edge fixing portion 11 is 0.15mm-0.3mm. Of course, the utility model does not limit this, and the thickness of the edge fixing portion 11 can be reasonably set according to actual needs. In this way, it can avoid that the thickness of the edge fixing portion 11 is too small, for example, when it is less than 0.1mm, the structural strength of the edge fixing portion 11 is too small, and it cannot maintain its own position and shape, and thus cannot effectively isolate the tension of the cover plate connecting portion 12 on the lug connecting portion 14; it can also avoid that the thickness of the edge fixing portion 11 is too large, for example, when it is greater than 0.6mm, the space occupied by the edge fixing portion 11 in the axial direction of the battery 100 is too large, which is not conducive to improving the energy density of the battery 100.

[0059] In some embodiments, reference Figure 4 , the radial inner end of the pole lug connection part 14 is connected to the cover plate connection part 12. In other words, the pole lug connection part 14 is arranged on the cover plate connection part 12. At this time, since the pole lug connection part 14 and the transition connection arm 13 are arranged at intervals in the circumferential direction, compared with the scheme in which the entire surface of the collector plate 1 is connected to the pole lug, the single pole lug connection part 14 is formed into a cantilever structure, the strength of the pole lug connection part 14 is reduced, and it is easier to deform toward the side of the electrode assembly 2. In this way, even if the cover plate connection part 12 bulges outward, it will drive the pole lug connection part 14, but due to the reduced strength of the pole lug connection part 14, when the connection strength between the pole lug connection part 14 and the pole lug is constant, the pole lug connection part 14 has a smaller pulling force on the pole lug, which helps to reduce the pulling force of the collector plate 1 on the pole lug, thereby relatively improving the connection stability between the collector plate 1 and the pole lug, and ensuring the electrical performance of the battery 100.

[0060] In some embodiments, the radial outer edge of the pole tab connection portion 14 is radially spaced from the edge fixing portion 11 to ensure that the current flows mainly from the pole tab connection portion 14 to the cover plate connection portion 12 , thereby improving the flow effect.

[0061] In some embodiments, reference Figure 5, the diameter D3 of the radial outer edge of the lug connection part 14 has a value range of: 30mm≤D3≤39mm, for example, the diameter D3 of the radial outer edge of the lug connection part 14 can be 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm or 39mm, preferably, the diameter D3 of the radial outer edge of the lug connection part 14 is 37mm-39mm. Of course, the utility model does not limit this, and the diameter D3 of the radial outer edge of the lug connection part 14 can be reasonably selected within the above range according to actual conditions. In this way, when the lug connection part 14 is arranged on the cover plate connection part 12, it can be avoided that the diameter of the radial outer edge of the lug connection part 14 is too small, for example, when it is less than 30mm, the welding area between the lug connection part 14 and the lug is too small, affecting the flow capacity, and it can also be avoided that the diameter of the radial outer edge of the lug connection part 14 is too large and connected to the edge fixing part 11.

[0062] In some embodiments, reference Figure 8-Figure 10 , the radial outer end of the pole lug connection portion 14 is connected to the edge fixing portion 11, that is, the pole lug connection portion 14 is arranged on the edge fixing portion 11. At this time, since the pole lug connection portion 14 is spaced apart from the connection between the transition connecting arm 13 and the edge fixing portion 11, and the buffer structure 131 can buffer the force of the cover plate connection portion 12 on the edge fixing portion 11, the buffer structure 131 and the edge fixing portion 11 can isolate the pulling force of the cover plate connection portion 12 from the pole lug connection portion 14. In this way, even if the cover plate connection portion 12 bulges outward with the cover plate 32, the position of the pole lug connection portion 14 can be kept stable, avoiding the pole lug connection portion 14 from pulling the pole lug, thereby ensuring the connection stability between the collecting plate 1 and the electrode assembly 2, ensuring the current flow capacity, and improving the electrical performance of the battery 100.

[0063] In some embodiments, in combination Figure 4 as well as Figure 8-Figure 10 There are multiple pole lug connecting parts 14, and the multiple pole lug connecting parts 14 are arranged at intervals along the circumference of the cover plate connecting part 12. A gap is formed between two adjacent pole lug connecting parts 14, and the transition connecting arm 13 is arranged in at least one of the multiple gaps. For example, a transition connecting arm 13 can be provided in each gap, or a transition connecting arm 13 can be provided in only some gaps.

[0064] like Figure 4 As shown, the pole lug connection part 14 is arranged on the cover plate connection part 12, there are six pole lug connection parts 14, six gaps are formed, six transition connection arms 13 are arranged, each gap is provided with a transition connection arm 13, and the pole lug connection parts 14 and the cover plate connection parts 12 are alternately arranged along the circumference of the cover plate connection part 12; Fig.10As shown, the pole ear connection part 14 is arranged at the edge fixing part 11, and there are four pole ear connection parts 14, forming four gaps in total, and one transition connecting arm 13 is provided, and the transition connecting arm 13 is arranged in one of the gaps; Fig. 9 As shown, the pole ear connection part 14 is arranged at the edge fixing part 11, and there are four pole ear connection parts 14, forming four gaps in total, and two transition connection arms 13 are provided, and the two transition connection arms 13 are respectively arranged in two gaps opposite to each other in the radial direction; Figure 8 As shown, the pole lug connection portion 14 is arranged at the edge fixing portion 11, and there are four pole lug connection portions 14, forming a total of four gaps. Four transition connection arms 13 are provided, and a transition connection arm 13 is provided in each gap, so that the pole lug connection portion 14 and the cover plate connection portion 12 are alternately arranged along the circumference of the cover plate connection portion 12.

[0065] It should be noted that, under the condition that the pole lug connection portion 14 is effectively connected to the pole lug, and the edge fixing portion 11 and the cover plate connection portion 12 are effectively connected, the present embodiment does not limit the number of pole lug connection portions 14 and transition connection arms 13 respectively. The number of pole lug connection portions 14 and transition connection arms 13 respectively may be the same or different. When the number of the two is the same, the pole lug connection portions 14 and the transition connection arms 13 are alternately arranged along the circumferential direction; when the number of the two is different, the number of pole lug connection portions 14 may be greater than the number of transition connection arms 13, or the number of transition connection arms 13 may be greater than the number of pole lug connection portions 14.

[0066] In some embodiments, the tab connection portion 14 includes a first side located at one radial end and two second sides opposite to each other in the circumferential direction. The connection between the first side and the second side may be an arc transition, such as a chamfer, to reduce the corners on the tab connection portion 14, which is beneficial to current convergence. Figure 4 As shown, the second side edge may extend along the radial direction of the current collecting plate 1, in which case the pole ear connecting portion 14 is substantially fan-shaped; or Figure 8-Figure 10 As shown, the extension direction of the second side is parallel to the radial direction of the current collecting plate 1. In this way, the structure of the pole lug connecting portion 14 is relatively simple and easy to manufacture.

[0067] Reference below Figure 1-Figure 10 A battery 100 according to an embodiment of the second aspect of the present invention is described.

[0068] The battery 100 of this embodiment may be a primary battery or a secondary battery. A primary battery refers to a battery that cannot be recharged and reused after being discharged, and a secondary battery refers to a battery that can be recharged to activate the active material and continue to be used after being discharged. The battery 100 may be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel cadmium battery, etc., and the embodiments of the present application are not limited thereto.

[0069] Combination Figure 1-Figure 3 The battery 100 of this embodiment may include: a shell assembly 3, an electrode assembly 2 and the current collecting plate 1 in the above embodiment.

[0070] Specifically, the shell assembly 3 may include a shell 31 and a cover plate 32 , wherein the shell 31 defines a receiving cavity with an opening at one end, the cover plate 32 may seal the opening, and a boss structure 321 is provided on an edge of the cover plate 32 facing the receiving cavity.

[0071] The electrode assembly 2 may include a positive electrode sheet, a negative electrode sheet and a separator. The positive electrode sheet includes a positive electrode current collector and a positive electrode active layer disposed on the surface of the positive electrode current collector. The negative electrode sheet includes a negative electrode current collector and a negative electrode active layer disposed 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 the electrode assembly 2, that is, the electrode assembly 2 is a wound battery cell. The electrode assembly 2 is disposed in the accommodating cavity of the housing 31, and a pole ear is disposed at one end of the electrode assembly 2 facing the opening, and the pole ear is a negative pole ear.

[0072] The cover plate connecting portion 12 of the current collecting plate 1 is welded to the cover plate 32 , and the pole tab connecting portion 14 is welded to the pole tab.

[0073] According to the battery 100 of the embodiment of the utility model, by providing the current collecting plate 1 in the above embodiment, under the premise of ensuring that the cover plate 32 and the electrode assembly 2 are electrically connected through the current collecting plate 1, when the cover plate 32 drives the cover plate connecting portion 12 of the current collecting plate 1 to bulge outward due to the increase of the internal air pressure of the battery 100, the pulling force of the current collecting plate 1 on the electrode ear can be reduced or even eliminated, thereby ensuring the connection stability between the current collecting plate 1 and the electrode assembly 2, thereby ensuring the current flow capacity and improving the electrical performance of the battery 100.

[0074] The electronic device according to the third embodiment of the present invention is described below.

[0075] 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. 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 toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. The electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. The electronic device can also be a battery module, a battery pack, etc. The embodiment of the present application does not impose any special restrictions on the above-mentioned electronic devices.

[0076] The electronic device may include: a device body and a battery 100. The device body may include a battery 100 compartment, in which the battery 100 is disposed and electrically connected to the device body, for example, a power supply interface may be provided in the battery 100 compartment, and the battery 100 may be connected to the power supply interface.

[0077] According to the electronic device of the embodiment of the utility model, by providing the battery 100 in the above embodiment, it is possible to more reliably store and supply energy for the electronic device, which is beneficial to improving the user experience.

[0078] 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.

[0079] 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.

[0080] 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).

[0081] 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.

[0082] 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 current collecting plate for a battery, characterized in that: include: Edge fixing part, cover plate connection part, transition connection arm and pole ear connection part, The cover plate connecting portion is located in the middle area of ​​the collecting plate, the edge fixing portion is located radially outside the cover plate connecting portion, the edge fixing portion is radially spaced apart from the cover plate connecting portion, and the transition connecting arm is connected between the edge fixing portion and the cover plate connecting portion; The pole lug connection portion is disposed on one of the edge fixing portion and the cover plate connection portion and is separated from the other one. The pole lug connection portion and the transition connection arm are arranged at intervals along the circumference of the cover plate connection portion.

2. The collecting plate according to claim 1, characterized in that: A buffer structure is provided on the transition connecting arm, and the buffer structure is configured to buffer the force acting on the edge fixing portion by the cover plate connecting portion.

3. The collecting plate according to claim 2, characterized in that: The buffer structure is formed by a partial structure of the transition connecting arm being recessed along the axial direction of the collecting plate.

4. The collecting plate according to claim 3, characterized in that: The buffer structure is formed in an arc shape extending along a circumferential direction of the collecting plate.

5. The collecting plate according to any one of claims 1 to 4, characterized in that: At least part of the structure of the cover plate connecting portion constitutes a thickened structure, and the thickened structure is welded to the cover plate of the battery. The value range of the thickness T1 of the thickened structure is: 0.2mm≤T1≤1.8mm.

6. The collecting plate according to any one of claims 1 to 4, characterized in that: The thickness T2 of the edge fixing portion has a value range of 0.1 mm ≤ T2 ≤ 0.6 mm.

7. The collecting plate according to any one of claims 1 to 4, characterized in that: The pole tab connection portion is connected to the cover plate connection portion.

8. The collecting plate according to claim 7, characterized in that: The diameter D3 of the radial outer edge of the pole lug connecting portion has a value range of: 30 mm ≤ D3 ≤ 39 mm.

9. The collecting plate according to any one of claims 1 to 4, characterized in that: The tab connecting portion is connected to the edge fixing portion.

10. The collecting plate according to any one of claims 1 to 4, characterized in that: There are multiple pole lug connection parts, and the multiple pole lug connection parts are arranged at intervals along the circumference of the cover plate connection part, and a gap is formed between two adjacent pole lug connection parts. The transition connecting arm is arranged in at least one of the plurality of gaps.

11. A battery, characterized in that: include: The housing assembly comprises a shell and a cover plate, wherein the shell defines a receiving cavity with an opening at one end, and the cover plate seals the opening; 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 facing the cover plate; The current collecting disk according to any one of claims 1 to 10, wherein the cover plate connecting portion of the current collecting disk is welded to the cover plate, and the pole lug connecting portion is welded to the pole lug.

12. An electronic device, characterized in that: include: The battery of claim 11.

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