Collector plate and battery

Abstract

The present invention relates to the field of battery technology, and discloses a current collector and a battery, wherein the current collector comprises: a first welding area, suitable for welding with a pole group; a second welding area, protruding from the plane where the first welding area is located and spaced apart from the first welding area, the second welding area being suitable for welding with a cover plate; a buffer zone, comprising a plurality of connecting ribs spaced apart along the circumference of the second welding area, one end of the connecting rib being connected to the first welding area and the other end being connected to the second welding area, the connecting rib being elastic, so that the second welding area can move radially relative to the first welding area. The connecting rib is elastic, so that the second welding area can be radially displaced relative to the first welding area under an external force, so that after the current collector is welded with the pole group, the position of the second welding area on the current collector can be adjusted to achieve accurate positioning and alignment of the current collector and the cover plate, thereby improving welding accuracy, and at the same time, since the first welding area does not move, the current collector can be prevented from pulling the pole ear of the pole group, thereby avoiding damage to the pole ear.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a current collecting plate and a battery. Background Art

[0002] The battery is usually composed of a shell, a pole group, a current collecting plate and a cover plate, wherein the pole group and the current collecting plate are contained in the shell, the cover plate is used to close the shell, the pole group is used to store and release energy, one side of the current collecting plate is welded to the pole group and the other side is welded to the cover plate to transmit the energy of the pole group to the outside. In the process of assembling the battery, the current collecting plate is usually welded to the pole group first and then the cover plate is welded to the current collecting plate. After the current collecting plate is welded to the pole group, the current collecting plate is fixed to the pole group, and the position of the pole group in the shell is relatively fixed, and the installation position of the cover plate on the shell is relatively fixed. The cover plate usually needs to be welded to a part of the area on the current collecting plate. In the subsequent welding of the cover plate and the current collecting plate, it is easy to cause the current collecting plate and the cover plate to be unable to be accurately positioned. Furthermore, in the process of welding the cover plate and the current collecting plate, in order to ensure the alignment of the welding position of the current collecting plate and the cover plate, the current collecting plate will move radially relative to the pole group, causing the pole ear of the pole group to be pulled, damaging the pole ear, and reducing the quality of the battery. Summary of the invention

[0003] In view of this, the present invention provides a current collecting plate and a battery to solve the problem of poor positioning accuracy when the current collecting plate is welded to the electrode group and then to the cover plate.

[0004] In a first aspect, the present invention provides a current collecting plate, comprising: a first welding area, suitable for welding with a pole group; a second welding area, protruding out of the plane where the first welding area is located and spaced apart from the first welding area, the second welding area being suitable for welding with a cover plate; a buffer zone, comprising a plurality of connecting ribs spaced apart circumferentially along the second welding area, a through hole 132 being formed between two adjacent connecting ribs 131, one end of the connecting rib being connected to the first welding area and the other end being connected to the second welding area, the connecting rib being elastic so that the second welding area can move radially relative to the first welding area.

[0005] Beneficial effect: By respectively setting the first welding area and the second welding area, the first welding area and the second welding area are not on the same plane, and one end of the connecting rib of the buffer zone is connected to the first welding area and the other end is connected to the second welding area, so as to realize the connection of the first welding area and the second welding area through the buffer zone. Because the connecting rib and the through hole are alternately arranged and the connecting rib is elastic, the second welding area can be radially displaced relative to the first welding area under external force, so as to adjust the position of the second welding area when the position of the first welding area is fixed, so as to realize the accurate positioning and alignment of the current collecting plate and the cover plate by adjusting the position of the second welding area on the current collecting plate after the current collecting plate and the pole group are welded, thereby improving the welding accuracy. At the same time, since the second welding area is laterally displaced relative to the first welding area, the first welding area does not move, so as to avoid the current collecting plate from pulling the pole ear of the pole group, avoid damaging the pole ear, ensure the battery quality, and improve the reliability of the battery.

[0006] In an optional embodiment, the connecting rib is in one of an "S" shape, a "C" shape, a "U" shape, a "V" shape, and a "W" shape.

[0007] Beneficial effect: The connecting rib is bent, thereby ensuring that the second welding area can be laterally displaced relative to the first welding area, thereby adjusting the position of the second welding area so that it is accurately positioned with the cover plate and the welding quality is improved.

[0008] In an optional embodiment, the number of the connecting ribs is at least two.

[0009] Beneficial effect: at least two connecting ribs can realize the spaced arrangement of the connecting ribs in the buffer zone, thereby forming through holes between adjacent connecting ribs, and at least two connecting ribs can improve the stability of the buffer zone support between the first welding zone and the second welding zone, avoiding the relative tilt of the second welding zone and the first welding zone to affect the flatness of the welding, thereby improving the reliability of the collecting plate and improving the processing quality.

[0010] In an optional embodiment, at least two of the connecting ribs are equally spaced apart along the circumference of the second welding zone.

[0011] Beneficial effect: At least two connecting ribs are distributed at equal intervals, which can improve the uniformity of the distribution of each connecting rib, and each connecting rib is distributed along the circumference of the second welding area. The buffer zone supports the second welding area along the circumference of the second welding area, which further improves the buffer zone's stable support for the second welding area, and can also ensure the stability of the second welding area when it is displaced relative to the first welding area, thereby improving the reliability of the collecting plate.

[0012] In an optional embodiment, a height H of the connecting rib along the axial direction of the collecting plate is in a range of 0.2 mm to 5 mm; and / or a thickness of the first welding area and the second welding area is in a range of 0.1 mm to 0.6 mm.

[0013] Beneficial effect: Setting the height of the connecting rib within the range of 0.2mm-5mm can ensure that the second welding area has sufficient displacement relative to the first welding area, and can ensure the overall stability of the collector plate, avoid the overall height of the collector plate being too large, and improve space utilization. Setting the thickness of the first welding area and the second welding area within the range of 0.1mm-0.6mm can ensure that the collector plate has sufficient strength, and ensure that the connecting rib has sufficient setting space, and can also avoid the collector plate from being too heavy, thereby improving battery performance.

[0014] In an optional embodiment, the first welding area is ring-shaped, a vacant area is formed inside the ring, and the second welding area corresponds to the vacant area.

[0015] Beneficial effect: By setting the first welding area to be ring-shaped, a vacant area is formed on the inner side of the ring, and the vacant area corresponds to the second welding area, the solid part of the area on the plane where the first welding area is located that is not convenient for welding is removed, which is beneficial to reduce the weight of the collecting plate, thereby reducing the overall weight of the battery and improving the energy density of the battery.

[0016] In an optional embodiment, one end of the connecting rib is connected to the inner side of the ring and the other end is connected to the outer contour of the second welding area.

[0017] Beneficial effects: The inner side of the ring on the first welding area and the outer contour of the second welding area are both at their respective edges. The inner circle of the first welding area and the outer contour of the second welding area are connected by setting connecting ribs, and the connecting ribs are connected between the edge of the first welding area and the edge of the second welding area, which facilitates the arrangement and processing of the connecting ribs, and the connection between the first welding area and the second welding area can achieve a smooth transition, the integrity of the collecting plate is good, the edge effect is reduced, and the current flow capacity of the collecting plate is improved.

[0018] In an optional embodiment, the first welding area is in an annular shape, the second welding area is in a circular shape, and the plurality of connecting ribs are arranged in a cylindrical or conical shape.

[0019] Beneficial effect: If the diameter of the second welding area is equal to the diameter of the inner circle of the first welding area, the extension direction of the connecting rib from the first welding area to the second welding area is parallel to the axis of the current collecting plate, and a plurality of connecting ribs are arranged in a cylindrical shape around the circumference of the second welding area, which has a simple structure, is easy to process and has good stability. If the diameter of the second welding area is greater than or less than the diameter of the inner circle of the first welding area, the extension direction of the connecting rib from the first welding area to the second welding area is not parallel to the axis of the current collecting plate, and a plurality of connecting ribs are arranged in a conical shape around the circumference of the second welding area, which can also achieve stable connection of the connecting rib to the first welding area and the second welding area.

[0020] In a second aspect, the present invention further provides a battery, comprising: a shell having an open end; a pole group disposed inside the shell; a cover plate disposed at the open end of the shell to close the shell; the above-mentioned current collecting plate disposed between the pole group and the cover plate, one side of the current collecting plate being welded to the pole group through a first welding area and the other side being welded to the cover plate through a second welding area. Because the battery includes a current collecting plate, it has the same effect as the current collecting plate, and is not described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic structural diagram of a current collecting plate according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A top view of the collecting plate shown;

[0024] Figure 3 for Figure 2 Sectional view in the AA direction;

[0025] Figure 4 A schematic structural diagram of another current collecting plate according to an embodiment of the present invention;

[0026] Figure 5 for Figure 4 A cross-sectional view of the collector plate shown;

[0027] Figure 6 It is a structural schematic diagram of another current collecting plate according to an embodiment of the present invention;

[0028] Figure 7 for Figure 6 A cross-sectional view of the collector plate shown;

[0029] Figure 8 A schematic structural diagram of another current collecting plate according to an embodiment of the present invention;

[0030] Fig. 9 for Figure 8 A cross-sectional view of the collector plate shown;

[0031] Fig.10 It is a schematic diagram of the structure after the current collecting plate and the pole group are assembled according to an embodiment of the present invention.

[0032] Description of reference numerals:

[0033] 11. First welding area; 12. Second welding area; 13. Buffer area; 131. Connecting rib; 132. Through hole; 2. Pole group. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0035] Combine the following Figures 1 to 10 , describing an embodiment of the present invention.

[0036] According to an embodiment of the present invention, on the one hand, a current collecting plate is provided, such as Figures 1 to 9 As shown, the current collecting plate includes: a first welding area 11, a second welding area 12 and a buffer area 13. The first welding area 11 is suitable for welding with the pole group 2; the second welding area 12 protrudes from the plane where the first welding area 11 is located and is spaced apart from the first welding area 11, and the second welding area 12 is suitable for welding with the cover plate; the buffer area 13 includes a plurality of connecting ribs 131 spaced apart along the circumference of the second welding area 12, and a through hole 132 is formed between two adjacent connecting ribs 131, one end of the connecting rib 131 is connected to the first welding area 11 and the other end is connected to the second welding area 12, and the connecting rib 131 is elastic so that the second welding area 12 can move radially relative to the first welding area 11. The spacing between the second welding area 12 and the first welding area 11 refers to the two being spaced apart along the circumference. Figure 3 The arrows in the middle point to the "up and down" direction. The radial direction refers to the radial direction of the collector plate, which is perpendicular to the axial direction of the collector plate. The axial direction of the collector plate refers to the Figure 3 The arrow in the middle points to the direction of "up and down".

[0037] The current collector of the present embodiment is applied, by respectively setting the first welding area 11 and the second welding area 12, the first welding area 11 and the second welding area 12 are not on the same plane, and one end of the connecting rib 131 of the buffer zone 13 is connected to the first welding area 11 and the other end is connected to the second welding area 12, so as to realize the connection of the first welding area 11 and the second welding area 12 through the buffer zone 13. Because the connecting rib 131 and the through hole 132 are alternately arranged, and the connecting rib 131 has elasticity, the second welding area 12 can be radially displaced relative to the first welding area 11 under an external force, so as to adjust the position of the second welding area 12 when the position of the first welding area 11 is fixed, so as to realize the accurate positioning and alignment of the current collector and the cover plate by adjusting the position of the second welding area 12 on the current collector after the current collector and the electrode group are welded, thereby improving the welding accuracy. At the same time, because the second welding area 12 is laterally displaced relative to the first welding area 11, the first welding area 11 does not move, so that the current collector can avoid pulling the pole ear of the electrode group, avoid damaging the pole ear, ensure the battery quality, and improve the reliability of the battery.

[0038] It should be noted that, during the battery assembly process, the current collecting plate is usually first welded to the electrode group and then welded to the cover plate. Vibration will be generated during the welding process. The vibration generated during the welding process of the traditional current collecting plate and the cover plate will be directly transmitted to the welding area between the current collecting plate and the electrode group, causing damage to the welded area, affecting the welding connection quality between the current collecting plate and the electrode group, and affecting the battery performance. The current collecting plate of this embodiment is first welded to the electrode group through the first welding area 11, and then welded to the cover plate through the second welding area 12. The connecting rib 131 connected between the first welding area 11 and the second welding area 12 is elastic, and the connecting rib 131 has a shock absorbing function, which can effectively prevent the vibration generated during the welding process of the current collecting plate and the cover plate from affecting the current collecting plate and the electrode group. The influence of the electrode group welding area is reduced, thereby improving the welding quality; for the traditional current collecting plate, there is no obvious separation between the area welded to the electrode group and the area welded to the cover plate, and the battery has no effective fusing mechanism. When the battery fails such as thermal runaway, the risk factor is relatively high. The current collecting plate of this embodiment connects the first welding area 11 and the second welding area 12 through the connecting rib 131. A plurality of connecting ribs 131 are arranged at intervals to separate the buffer zone 13 into a hollow state, so that the internal resistance of the buffer zone 13 is relatively large. When the battery is under severe conditions such as overcharge / overdischarge, the heat generated at the connecting rib 131 is relatively large, and the connecting rib 131 can be melted first to open the circuit inside the battery, thereby avoiding further charging / discharging of the battery and causing explosion, thereby improving the safety of the battery and improving product performance.

[0039] It should be noted that a plurality of connecting ribs 131 are arranged at intervals, and through holes 132 are formed between adjacent connecting ribs 131, so that the buffer zone 13 is composed of two parts: the connecting ribs 131 and the through holes 132. The size of each connecting rib 131 along the circumference of the second welding area 12 is smaller than the circumference of the circumferential surface where it is located. The connecting rib 131 is small in size and therefore has a certain deformation capacity, that is, the connecting rib 131 has elasticity, which ensures the deformability of the connecting rib 131 under the action of external force, and can realize the movement of the second welding area 12 relative to the first welding area 11, and maintain the relative stability of the position between the second welding area 12 and the first welding area 11 after the relative displacement; the through hole 132 connects the inner side and the outer side of the buffer zone 13, thereby providing an infiltration channel for the electrolyte in the battery, ensuring the smooth flow of the electrolyte, and ensuring that the inside of the battery is fully infiltrated with the electrolyte, thereby improving the battery performance, wherein the inner side refers to the side along the radial direction of the collector toward the center thereof, and the outer side refers to the side along the radial direction of the collector toward the edge thereof.

[0040] Preferably, the first welding area 11, the second welding area 12 and the buffer area 13 are integrally stamped and formed, which is convenient to process, has good integrity and high reliability. The thickness of the connecting rib 131 is less than or equal to the thickness of the first welding area 11 and the second welding area 12, wherein the thickness of the connecting rib 131 refers to the size of the connecting rib 131 along the radial direction of the collector plate, and the thickness of the first welding area 11 and the second welding area 12 refers to the size of the connecting rib 131 along the radial direction of the collector plate. Figure 3 The arrow in the middle points to the dimension in the "up and down" direction. The collector plate is made of metal, and the collector plate can be the negative electrode collector plate in the battery. In this case, the collector plate is made of copper.

[0041] Preferably, the first welding area 11 and the pole group, and the second welding area 12 and the cover plate are connected by penetration welding through laser welding. Laser penetration welding is easy to operate, has good welding effect and high stability.

[0042] In one embodiment, Figures 1 to 3 As shown, the connecting rib 131 is in an "S" shape. Specifically, the "S" shape extends along the axial direction of the current collecting disk, with one end connected to the first welding area 11 and the other end connected to the second welding area 12, so that the connecting rib 131 is bent, thereby ensuring that the second welding area 12 can be laterally displaced relative to the first welding area 11, thereby achieving adjustment of the position of the second welding area 12 so that it is precisely positioned with the cover plate and the welding quality is improved; and the "S"-shaped curve is smooth, which can reduce stress concentration, improve the quality of the connecting rib 131, and ensure the reliability of the current collecting disk. Among them, the lateral displacement refers to the fact that the first welding area 11 and the second welding area 12 remain relatively parallel, and the two are relatively misaligned in a direction perpendicular to the axis of the current collecting disk. It can be understood that as an alternative embodiment, such as Figures 4 to 5 As shown, the connecting rib 131 may also be in a reverse "S" shape, that is, the bending direction of the connecting rib 131 is Figures 1 to 3The bending direction of the connecting rib 131 shown is opposite, which can also ensure that the connecting rib 131 is bent in a uniformly changing shape, thereby achieving the displacement of the second welding area 12 relative to the first welding area 11 .

[0043] In addition, in other embodiments, the connecting rib 131 is as follows Figure 6 to Figure 7 "C" shape as shown, or as Figures 8 to 9 As shown in the reverse "C" shape, the connecting rib 131 can also be bent, and the second welding area 12 can be laterally displaced relative to the first welding area 11, so as to adjust the position of the second welding area 12 and ensure the precise positioning of the second welding area 12 and the cover plate. In addition, the "C"-shaped structure is simple and easy to process, with a smooth transition, which can avoid stress concentration and improve the reliability of the connecting rib 131.

[0044] In addition, in other embodiments, the connecting rib 131 may also be in a "U" shape, "V" shape, or "W" shape (not shown in the figure). Specifically, the connecting rib 131 is in a horizontal "U" shape, "V" shape, or "W" shape, which can also ensure that the connecting rib 131 is in a bent shape, thereby ensuring that the second welding area 12 can be laterally displaced relative to the first welding area 11.

[0045] In one embodiment, the number of the connecting ribs 131 is at least two. At least two connecting ribs 131 can realize that the connecting ribs 131 in the buffer zone 13 are arranged at intervals, so that the through holes 132 are formed between adjacent connecting ribs 131, and at least two connecting ribs 131 can improve the stability of the buffer zone 13 supported between the first welding zone 11 and the second welding zone 12, and avoid the second welding zone 12 and the first welding zone 11 from being tilted relative to each other and affecting the flatness of the welding, thereby improving the reliability of the collector plate and improving the processing quality.

[0046] In one embodiment, at least two connecting ribs 131 are equally spaced along the circumference of the second welding area 12. At least two connecting ribs 131 are equally spaced, which can improve the uniformity of the distribution of each connecting rib 131, and each connecting rib 131 is distributed along the circumference of the second welding area 12, and the buffer area 13 supports the second welding area 12 along the circumference of the second welding area 12, further improving the stable support of the buffer area 13 to the second welding area 12, and can also ensure the stability of the second welding area 12 when it is displaced relative to the first welding area 11, thereby improving the reliability of the collector plate.

[0047] In one embodiment, the height H of the connecting rib 131 along the axial direction of the current collecting plate ranges from 0.2 mm to 5 mm. Figure 3 As shown, the axial direction of the collector plate refers to the Figure 3 In the direction indicated by the arrow in the middle, the height H of the connecting rib 131 refers to the height H of the connecting rib 131 along the Figure 3The dimension in the "up and down" direction indicated by the middle arrow, that is, the distance between the first welding area 11 and the second welding area 12, if the height H of the connecting rib 131 is less than 0.2mm, the height dimension of the connecting rib 131 is too small, and the distance between the first welding area 11 and the second welding area 12 is too small, and it is difficult to ensure that the second welding area 12 has sufficient displacement when it is laterally displaced relative to the first welding area 11. The displacement of the second welding area 12 may not allow the second welding area 12 to reach a position precisely aligned with the welding area on the cover plate, and the second welding area 12 cannot be precisely positioned with the cover plate, and the collector plate still pulls the pole group ear; if the height H of the connecting rib 131 is greater than 5mm, then The height of the connecting rib 131 is too large, the distance between the first welding area 11 and the second welding area 12 is too large, the stability of the connecting rib 131 along the axial direction of the current collecting plate is poor, the second welding area 12 and the first welding area 11 are prone to relative shaking, the strength of the current collecting plate along its axial direction is too low, and the overall height of the current collecting plate is too large, which is not conducive to the miniaturization of the overall battery, will reduce the energy density of the battery, and affect the battery performance. Therefore, the height of the connecting rib 131 is set to a value within the range of 0.2mm-5mm, which can not only ensure that the second welding area 12 has sufficient displacement relative to the first welding area 11, but also ensure the overall stability of the current collecting plate, avoid the overall height of the current collecting plate being too large, and improve space utilization.

[0048] In one embodiment, the thickness of the first welding area 11 and the second welding area 12 ranges from 0.1 mm to 0.6 mm. It should be noted that the thickness of the first welding area 11 is equal to the thickness of the second welding area 12. Figure 3 The dimensions in the "up and down" direction indicated by the middle arrow, the first welding area 11 and the second welding area 12 are the main parts of the current collecting plate. If the thickness of the first welding area 11 and the second welding area 12 is less than 0.1mm, the thickness of the main part of the current collecting plate is too small, the strength of the current collecting plate is insufficient, and the current collecting plate is easily welded through during the welding process, affecting the welding quality; if the thickness of the first welding area 11 and the second welding area 12 is greater than 0.6mm, the thickness of the main part of the current collecting plate is too large, which will compress the height of the connecting rib 131, affect the displacement of the second welding area 12 relative to the first welding area 11, and is not conducive to the precise alignment between the second welding area 12 and the cover plate. In addition, if the thickness of the current collecting plate is too large, the weight of the current collecting plate will be too large, which is not conducive to achieving lightweight batteries and affects the improvement of battery energy density. Therefore, setting the thickness of the first welding area 11 and the second welding area 12 within the range of 0.1 mm-0.6 mm can ensure that the current collecting plate has sufficient strength, ensure that the connecting ribs 131 have sufficient setting space, and avoid excessive weight of the current collecting plate, thereby improving battery performance.

[0049] In one embodiment, the first welding area 11 is annular, and a vacant area is formed inside the annular shape, and the second welding area 12 corresponds to the vacant area. It should be noted that the second welding area 12 and the first welding area 11 are arranged along the Figure 3 The second welding area 12 is arranged at intervals in the "up and down" direction indicated by the middle arrow, so that the second welding area 12 blocks part of the area on the plane where the first welding area 11 is located, and the blocked area is not convenient for welding with the pole group. By setting the first welding area 11 to be annular, a vacant area is formed on the inner side of the ring, and the vacant area corresponds to the second welding area 12, the solid part of the area on the plane where the first welding area 11 is located that is not convenient for welding is removed, which is beneficial to reduce the weight of the current collecting plate, thereby reducing the overall weight of the battery and improving the energy density of the battery. Specifically, along the radial direction of the current collecting plate, the projection of the second welding area 12 on the plane where the first welding area 11 is located is located on the inner side of the first welding area 11, which is convenient for processing and for welding the current collecting plate to the pole group and the cover plate respectively. Among them, the inner side of the ring refers to the side of the ring pointing to its center along its radial direction, that is, the inner circle of the ring; the second welding area 12 corresponds to the vacant area and refers to the two along the radial direction. Figure 3 The “up and down” directions indicated by the middle arrows are in a corresponding up and down positional relationship.

[0050] In one embodiment, one end of the connecting rib 131 is connected to the inner side of the ring and the other end is connected to the outer contour of the second welding area 12. The inner side of the ring on the first welding area 11 and the outer contour of the second welding area 12 are both at their respective edges. By setting the connecting rib 131 to connect between the inner circle of the first welding area 11 and the outer contour of the second welding area 12, the connecting rib 131 is connected between the edge of the first welding area 11 and the edge of the second welding area 12, which facilitates the arrangement and processing of the connecting rib 131, and the connection between the first welding area 11 and the second welding area 12 can achieve a smooth transition, the integrity of the collector plate is good, the edge effect is reduced, and the flow capacity of the collector plate is improved. Preferably, the shape of the second welding area 12 is the same as the shape of the inner circle on the first welding area 11 and the radial dimensions of the two are equal, that is, the projection of the second welding area 12 on the plane where the first welding area 11 is located coincides with the inner circle of the ring, and the buffer zone formed by the plurality of connecting ribs 131 around the second welding area 12 is hollow columnar, and the axis of the hollow column coincides with the axis of the collector plate, which facilitates the processing of the collector plate. It can be understood that, as an alternative embodiment, the end of the connecting rib 131 connected to the first welding area 11 can also be located at a certain distance from the inner circle on the ring, and the end of the connecting rib 131 connected to the second welding area 12 can also be located at a certain distance from the outer contour of the second welding area 12, which can also achieve stable connection of the connecting rib 131 to the first welding area 11 and the second welding area 12.

[0051] In one embodiment, the first welding area 11 is annular, the second welding area 12 is circular, and the plurality of connecting ribs 131 are arranged in a cylindrical shape. It should be noted that the current collecting plate can be used in cylindrical batteries, the current collecting plate is disc-shaped, the diameter of the second welding area 12 is equal to the diameter of the inner circle of the first welding area 11, then the extension direction of the connecting rib 131 from the first welding area 11 to the second welding area 12 is parallel to the axis of the current collecting plate, and the plurality of connecting ribs 131 are arranged in a cylindrical shape around the circumference of the second welding area 12, the structure is simple, easy to process and has good stability.

[0052] In addition, in other embodiments, the plurality of connecting ribs 131 may also be arranged in a cone shape. In this case, the diameter of the second welding area 12 is greater than or less than the diameter of the inner circle of the first welding area 11. Then, the extension direction of the connecting rib from the first welding area 11 to the second welding area 12 is not parallel to the axis of the collecting plate. The plurality of connecting ribs 131 are arranged in a cone shape circumferentially around the second welding area 12, which can also achieve stable connection of the connecting rib 131 to the first welding area 11 and the second welding area 12.

[0053] According to an embodiment of the present invention, on the other hand, a battery is provided, comprising: a housing, an electrode group 2, a cover plate, and the above-mentioned current collecting plate. The housing has an open end; the electrode group 2 is arranged inside the housing; the cover plate is arranged at the open end of the housing to close the housing; the current collecting plate is arranged between the electrode group 2 and the cover plate, one side of the current collecting plate is welded to the electrode group 2 through a first welding area 11 and the other side is welded to the cover plate through a second welding area 12. Fig.10 As shown, after the current collecting plate is welded to the electrode group 2 via the first welding area 11 , the second welding area 12 is located on the side of the current collecting plate away from the electrode group 2 , so as to facilitate welding of the second welding area 12 to the cover plate.

[0054] Preferably, the battery is a cylindrical battery, and the current collecting disk is a negative electrode current collecting disk.

[0055] In this embodiment, a current collecting plate is provided including a second welding area 12 and a first welding area 11 spaced apart from each other, and the first welding area 11 and the second welding area 12 are connected by an elastic connecting rib 131. The connecting rib 131 is arranged circumferentially around the second welding area 12, so that after the current collecting plate is welded to the electrode group through the first welding area 11, the second welding area 12 can be laterally displaced relative to the first welding area 11, and the pulling force on the electrode ear caused by the inability to accurately position the current collecting plate and the cover plate after the current collecting plate and the electrode group are welded and fixed can be effectively alleviated, thereby improving the battery performance; and under severe conditions such as overcharging / over-discharging of the battery, the connecting rib 131 can be melted to cause an internal circuit break in the battery, thereby reducing the risk of explosion caused by overcharging of the battery.

[0056] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A collecting plate, characterized in that: include: A first welding zone, suitable for welding with the electrode group; a second welding area, protruding from the plane where the first welding area is located and spaced apart from the first welding area, the second welding area being suitable for welding with the cover plate; a buffer zone, comprising a plurality of connecting ribs spaced apart along the circumference of the second welding zone, a through hole being formed between two adjacent connecting ribs, one end of the connecting rib being connected to the first welding zone and the other end being connected to the second welding zone, the connecting rib being elastic so that the second welding zone can move radially relative to the first welding zone; The height H of the connecting rib along the axial direction of the collector plate is in the range of 0.2 mm to 5 mm; The thickness of the first welding area and the second welding area ranges from 0.1 mm to 0.6 mm; The connecting rib is in a bent shape; The connecting rib is in one of the following shapes: "S", "C", "U", "V", and "W"; The number of the connecting ribs is at least two; At least two of the connecting ribs are equally spaced along the circumference of the second welding area; The first welding area is annular, a vacant area is formed inside the annular shape, and the second welding area corresponds to the vacant area; One end of the connecting rib is connected to the inner side of the ring and the other end is connected to the outer contour of the second welding area; The first welding area is in an annular shape, the second welding area is in a circular shape, and a plurality of the connecting ribs are arranged in a cylindrical or conical shape.

2. A battery, characterized in that: include: a housing having an open end; A pole group, arranged inside the shell; a cover plate, disposed at the open end of the shell to close the shell; The current collecting plate of claim 1 is arranged between the pole group and the cover plate, one side of the current collecting plate is welded to the pole group through a first welding area and the other side is welded to the cover plate through a second welding area.

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