Collecting plate and battery

Abstract

The utility model relates to the technical field of batteries, and provides a collector plate and a battery. Wherein the current collecting disc is provided with a first surface and a second surface which are oppositely arranged, the first surface is sunken to form a concave part, the concave part is provided with a ventilation groove penetrating through the concave part, and the second surface is provided with a welding area corresponding to the concave part. Due to the existence of the concave part, a gap is formed between the battery cell and the bottom wall of the concave part, namely, the position, right facing the welding area, of the battery cell is not in contact with the collector plate, so that heat transferred to the battery cell can be effectively reduced, the risk that the battery cell is burnt is reduced, and the service life is prolonged.

Description

Technical Field

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

[0002] The battery includes a shell and a battery cell installed in the shell, the upper and lower ends of the shell are open, and the upper and lower ends of the shell are respectively assembled with the positive cover plate and the negative cover plate. The battery cell tabs are flattened and welded to the collector plate, and are transferred to the pole terminal of the cover plate through the collector plate. This type of battery has many assembly parts, complicated assembly procedures, and low battery cell energy density. In order to solve the above problems, people set the shell to a structure with one end open, for example, the bottom end of the shell is closed and the top end is open, so as to reduce the use of the cover plate, wherein the shell is charged. In a battery using such a shell, there are two collector plates for welding the battery cell tabs inside the shell, one of which is located at the upper end of the shell and connected to the pole, and the other collector plate is located at the lower end of the shell and welded to the shell. However, when the collector plate is penetrated and welded to the lower end of the shell, a large amount of heat generated by the welding will be transferred to the battery cell, so that the battery cell is easily burned. Utility Model Content

[0003] The utility model aims to provide a current collecting plate and a battery, aiming to solve the technical problem that the existing battery core is easily burned.

[0004] In a first aspect, the present application provides a collecting plate having a first surface and a second surface arranged opposite to each other, wherein the first surface is recessed to form a concave portion, the concave portion is provided with a ventilating groove running through the concave portion, and the second surface is provided with a welding area corresponding to the concave portion.

[0005] Optionally, the air permeable groove is located in the middle of the collecting plate.

[0006] Optionally, the recess is in the shape of a continuous or discontinuous ring.

[0007] Optionally, the second surface is provided with a first welding structure, the first welding structure protrudes in a direction away from the first surface, and the first welding structure is a welding area.

[0008] Optionally, the first surface is provided with at least one second welding structure, and the second welding structure protrudes in a direction away from the recess.

[0009] Optionally, at least two second welding structures are provided, and the at least two second welding structures are arranged at intervals along the circumference of the collecting plate, and two adjacent second welding structures define a gas channel.

[0010] Optionally, a distance between a wall surface of the recess close to the second surface and a surface of the second welding structure away from the second surface is greater than or equal to 0.3 mm.

[0011] Optionally, the first surface is further provided with at least one through groove penetrating the current collecting plate.

[0012] Optionally, the collecting plate is provided with a positioning groove.

[0013] Optionally, the second surface is further provided with a supporting boss, which protrudes in a direction away from the first surface.

[0014] Optionally, the ventilation groove is a through hole.

[0015] In the second aspect, the present application provides a battery, including a shell, a battery cell and the above-mentioned current collecting plate, the battery cell is installed in the shell, an explosion-proof valve is arranged in the middle of one end of the shell, the current collecting plate is located between the battery cell and the shell, and the air permeable groove is arranged opposite to the explosion-proof valve.

[0016] Optionally, the area of ​​the air permeable groove is greater than or equal to the area of ​​the explosion-proof valve.

[0017] Optionally, in the radial direction of the explosion-proof valve, the distance between the recess and the explosion-proof valve is less than or equal to 10 mm.

[0018] The beneficial effects of the current collecting plate and battery provided by the utility model are as follows: the first surface is the surface of the current collecting plate facing the battery cell, and the second surface is the surface of the current collecting plate facing the bottom wall of the shell. By setting a recess on the first surface, a gap is provided between the battery cell and the bottom wall of the recess. A welding area is set at a position corresponding to the recess on the second surface. Then, when the shell and the welding area of ​​the second surface are welded, the position of the battery cell facing the welding area does not contact the current collecting plate due to the presence of the recess, which can effectively reduce the heat transferred to the battery cell, thereby reducing the risk of the battery cell being burned, which is conducive to extending the service life. Since the battery uses the above-mentioned current collecting plate, the service life of the battery can be effectively extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic diagram of the structure of a battery provided in an embodiment of the utility model;

[0021] Figure 2 Another structural schematic diagram of a battery provided in an embodiment of the utility model;

[0022] Figure 3 A schematic diagram of the structure of a current collecting plate provided in an embodiment of the utility model;

[0023] Figure 4 Another structural schematic diagram of a battery provided in an embodiment of the utility model;

[0024] Figure 5 for Figure 4 A is an enlarged view of the middle image.

[0025] Among them, the reference numerals in the figure are:

[0026] 100. Collection plate; 10. First surface; 20. Recessed portion;

[0027] 30. second surface; 40. positioning groove; 11. second welding structure;

[0028] 12. Gas channel; 13. Through slot; 21. Ventilation slot;

[0029] 31. First welding structure; 32. Support boss; 1. Battery;

[0030] 200, housing; 210, first installation cavity; 220, second installation cavity;

[0031] 230, air hole; 240, convex part; 300, battery cell;

[0032] 400. End cover assembly; 500. Explosion-proof valve. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0035] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Please refer to Figures 1 to 5 Now, the current collecting plate 100 and the battery 1 in the embodiment of the utility model are described.

[0039] Please refer to Figure 1 and Figure 2 The present application provides a battery 1, including a shell 200, a battery cell 300 and a current collecting plate 100, the battery cell 300 is installed in the shell 200, an explosion-proof valve 500 is arranged in the middle of one end of the shell 200, the current collecting plate 100 is located between the battery cell 300 and the shell 200, and the air permeable groove 21 is arranged opposite to the explosion-proof valve 500.

[0040] Specifically, the battery 1 further includes an end cap assembly 400, a first installation cavity 210 for installing the battery cell 300 is provided on the top surface of the shell 200, a second installation cavity 220 for installing the explosion-proof valve 500 is provided in the middle of the bottom surface of the shell 200, and an air hole 230 is provided in the middle of the wall surface of the second installation cavity 220 close to the first installation cavity 210, and the air hole 230 penetrates the shell 200 and communicates with the first installation cavity 210. The air permeable groove 21 is arranged on the current collecting plate 100, and the current collecting plate 100 is placed at the bottom of the shell 200 and is welded with the shell 200 by penetration welding. The current collecting plate 100 is also used to weld the first pole ear of the battery cell 300 to realize the electrical connection between the battery cell 300 and the shell 200. The end cap assembly 400 is sealed at the top of the shell 200 and welded to the second pole ear of the battery cell 300. The polarity of the first pole ear is opposite to that of the second pole ear. The first pole ear can be a positive pole ear or a negative pole ear, which is not limited here.

[0041] The explosion-proof valve 500 acts as a pressure relief device when thermal runaway occurs in the battery. Taking a cylindrical battery as an example, in the prior art, the explosion-proof valve 500 is generally disposed on the cover plate of the end cap assembly 400. However, since the cover plate is also provided with a pole, the area occupied by the explosion-proof valve 500 on the cover plate is limited, so that the explosion-proof valve 500 is insufficient to meet the requirements of the high-capacity battery cell 300, and safety problems are prone to occur.

[0042] In the battery 1 of the present application, since the battery cell 300 is electrically connected to the shell 200 through the current collecting plate 100, there is no need to set a pole at the bottom of the shell 200. By setting the second installation cavity 220 on the bottom surface of the shell 200, the size of the explosion-proof valve 500 is not limited by the pole. In other words, compared with the existing battery in which the explosion-proof valve 500 is set on the cover plate, the explosion-proof valve 500 of the battery 1 can be designed to be larger, so that the explosion-proof valve 500 can meet the use requirements of higher capacity battery cells 300, which is conducive to improving the safety performance of the battery 1.

[0043] In addition, in existing cylindrical batteries, the pole is generally arranged in the middle of the cover plate, which results in that the explosion-proof valve 500 can only be arranged eccentrically on the cover plate. In the battery 1 of the present application, the air hole 230 and the second installation cavity 220 are arranged in the middle of the bottom surface of the shell 200, so that the explosion-proof valve 500 is installed in the middle of the bottom surface of the shell 200, which can improve the sensitivity and stability of the explosion-proof valve 500.

[0044] In another embodiment of the present application, please refer to Figure 2 and Figure 5The middle part of the bottom wall of the shell 200 is raised to form a convex portion 240, and the air hole 230 passes through the top surface of the convex portion 240. The convex portion 240 is used to position the air permeable groove 21 of the collecting plate 100 to improve the welding quality between the collecting plate 100 and the shell 200, and avoid misaligned welding between the collecting plate 100 and the shell 200.

[0045] It is understandable that the outer shape of the convex portion 240 may be circular, square or other irregular shapes, and similarly, the shape of the venting groove 21 may also be circular, square or other irregular shapes, as long as the convex portion 240 can play a positioning role for the venting groove 21. In addition, the outer shape of the convex portion 240 and the shape of the venting groove 21 may be the same or different. For example, in some embodiments, the outer shape of the convex portion 240 is circular, and the shape of the venting groove 21 is square. In this embodiment, the outer shape of the convex portion 240 is circular, and the shape of the venting groove 21 is circular, that is, the venting groove 21 is a through hole.

[0046] In another embodiment of the present application, the area of ​​the vent groove 21 is greater than or equal to the area of ​​the explosion-proof valve 500. The collecting plate 100 has a central plane perpendicular to the up-down direction, the projection of the vent groove 21 on the central plane is projection A, the projection of the air hole 230 on the central plane is projection B, and projection B is located within projection A. Such a configuration can facilitate the pressure relief of the explosion-proof valve 500.

[0047] As mentioned in the background art, in the prior art, when the collecting plate 100 is welded to the lower end of the shell 200 by penetration welding, a large amount of heat generated by welding will be transferred to the battery cell 300, so that the battery cell 300 is easily burned.

[0048] To this end, the present application also provides a current collecting plate 100 to solve the above problem. The current collecting plate 100 of the present application has a first surface 10 and a second surface 30 arranged opposite to each other, the first surface 10 is recessed to form a recess 20, the recess 20 is provided with a venting groove 21 penetrating the recess 20, and the second surface 30 is provided with a welding area corresponding to the recess 20.

[0049] The first surface 10 is located above the second surface 30. The first surface 10 is the surface of the current collecting plate 100 facing the battery cell 300, and the second surface 30 is the surface of the current collecting plate 100 facing the bottom wall of the shell 200. By setting the recess 20 on the first surface 10, a gap is provided between the battery cell 300 and the bottom wall of the recess 20. A welding area is provided at the position of the second surface 30 corresponding to the recess 20. Then, when the bottom wall of the shell 200 is welded to the welding area of ​​the second surface 30, due to the presence of the recess 20, the position of the battery cell 300 facing the welding area does not contact the current collecting plate 100, which can effectively reduce the heat transferred to the battery cell 300, thereby reducing the risk of the battery cell 300 being burned, which is conducive to extending the service life. The battery 1 of the present application can effectively extend the service life due to the use of the above-mentioned current collecting plate 100.

[0050] The provision of the recess 20 can not only reduce the risk of the battery cell 300 being burned, but also prevent the battery cell 300 from crushing the explosion-proof valve 500, and also ensure that the gas inside the housing 200 can be discharged smoothly.

[0051] In another embodiment of the present application, please refer to Figure 3 , the air permeable groove 21 is located in the middle of the current collecting plate 100. Specifically, the recess 20 is located in the middle of the first surface 10, and the air permeable groove 21 is located in the middle of the recess 20. This arrangement is to match a shell 200, and the middle of the bottom surface of the shell 200 is provided with air holes 230 and a second installation cavity 220 from top to bottom, and the air holes 230 are connected to the second installation cavity 220, and the second installation cavity 220 is used to install the explosion-proof valve 500. The air permeable groove 21 is arranged in the middle of the current collecting plate 100 to face the explosion-proof valve 500, which can improve the sensitivity and stability of the explosion-proof valve 500 when the battery 1 using the current collecting plate 100 is in thermal runaway.

[0052] In another embodiment of the present application, please refer to Figure 5 The second surface 30 is provided with a first welding structure 31, which protrudes in a direction away from the first surface 10. The first welding structure 31 is a welding area, and the first welding structure 31 is used for through-welding with the shell 200. Specifically in this embodiment, the first welding structure 31 protrudes downward. Generally, the thickness of the collector plate 100 is relatively thin. Based on this, in order to further increase the depth of the recess 20, the welding area on the second surface 30 is convexly arranged, so that the heat transferred to the battery cell 300 when the collector plate 100 is welded with the shell 200 can be further reduced.

[0053] In some embodiments, the recess 20 and the first welding structure 31 are formed by a stamping process, which can simplify the production process and improve production efficiency.

[0054] It is understandable that the recess 20 may be in a ring shape, a square shape or other irregular shapes, which is not limited here. In the present embodiment, the recess 20 is in a ring shape, and since the recess 20 and the first welding structure 31 are formed by a stamping process, the first welding structure 31 is also in a ring shape. Compared with other shapes such as a square, the ring-shaped first welding structure 31 can be welded to the housing 200 in a smaller area, so that the housing 200 can reduce the area used for welding with the collecting plate 100, which facilitates the design of the structure of the housing 200.

[0055] In addition, the recess 20 may be in a continuous ring shape or in a discontinuous ring shape, which is not limited here. In this embodiment, the recess 20 is in a continuous ring shape. Compared with the recess 20 in a discontinuous ring shape, the former has more areas to be welded with the shell 200, which is beneficial to improve the stability of the current collecting plate 100 and the shell 200 after welding.

[0056] In another embodiment of the present application, please refer to Figure 3 and Figure 4 The first surface 10 is provided with at least one second welding structure 11, and the second welding structure 11 protrudes in a direction away from the recess 20. Specifically, the second welding structure 11 protrudes upward. The second welding structure 11 is used to be welded with the battery cell 300 to achieve electrical connection between the current collecting plate 100 and the battery cell 300.

[0057] The second welding structure 11 is arranged to protrude from the first surface 10. On the one hand, the distance between the battery cell 300 and the bottom wall of the recess 20 can be further increased, thereby further reducing the heat transferred to the battery cell 300 when the collector plate 100 is welded to the shell 200. On the other hand, a height difference can be formed between the battery cell 300 and the first surface 10. When the battery 1 has a thermal runaway, the gas inside the shell 200 can enter the recess 20 through the gap between the battery cell 300 and the first surface 10, and act on the explosion-proof valve 500 through the pores 230 of the shell 200. It can be seen that when the battery cell 300 has a height difference with the first surface 10, the circulation of the gas inside the shell 200 can be facilitated, so that the explosion-proof valve 500 can be opened smoothly.

[0058] In some embodiments, the second welding structure 11 is formed by a stamping process to improve production efficiency.

[0059] In another embodiment of the present application, please refer to Figure 3, at least two second welding structures 11 are provided, and at least two second welding structures 11 are arranged at intervals along the circumference of the current collecting disk 100, and two adjacent second welding structures 11 define a gas channel 12. In this embodiment, illustratively, four second welding structures 11 are provided, and the four second welding structures 11 surround the recess 20 and are arranged at intervals along the circumference of the current collecting disk 100. When the battery 1 has a thermal runaway, the gas inside the shell 200 enters the recess 20 through the gas channel 12. Providing at least two second welding structures 11 can make the force on the battery cell 300 after welding more uniform, which is beneficial to improving the service life of the battery 1.

[0060] Of course, in some other embodiments, the number of the second welding structures 11 may be two, three or more.

[0061] In another embodiment of the present application, the distance between the wall surface of the recess 20 close to the second surface 30 and the surface of the second welding structure 11 away from the second surface 30 is greater than or equal to 0.3 mm. Specifically, the distance between the bottom wall of the recess 20 and the top surface of the second welding structure 11 is greater than or equal to 0.3 mm. That is, in the battery 1 using the current collecting plate 100, the distance between the bottom wall of the recess 20 and the battery cell 300 is greater than or equal to 0.3 mm.

[0062] Preferably, the distance between the wall of the recess 20 close to the second surface 30 and the surface of the second welding structure 11 away from the second surface 30 is 1 to 5 mm, for example, it can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm.

[0063] When the distance between the bottom wall of the recess 20 and the top surface of the second welding structure 11 is greater than or equal to 0.3 mm, the heat transferred to the battery cell 300 when the current collecting plate 100 and the shell 200 are welded can be effectively reduced. When the distance between the bottom wall of the recess 20 and the top surface of the second welding structure 11 is 1 to 5 mm, the battery 1 can also have good gas flowability.

[0064] In another embodiment of the present application, please refer to Figure 3 and Figure 4 The first surface 10 is also provided with at least one through slot 13 penetrating the collector plate 100. Specifically, the through slot 13 penetrates the second surface 30 of the collector plate 100. Such a configuration can reduce the weight of the collector plate 100.

[0065] In addition, as mentioned above, in the current collecting plate 100 and the battery 1 provided in the present application, due to the height difference between the first surface 10 and the second welding structure 11, a gas channel 12 for gas circulation is formed between the first surface 10 and the battery 1, and the gas inside the housing 200 enters the gas channel 12 at the edge of the first surface 10. Figure 4 and Figure 5 , the through groove 13 and the bottom wall of the housing 200 have a height difference, and the height difference is formed by the spacing between the second surface 30 and the bottom wall of the housing 200. The gas inside the housing 200 flows into the gas channel 12 through the through groove 13 below the current collecting plate 100. It can be seen that after the current collecting plate 100 provided with the through groove 13 is matched with the housing 200, the flowability of the gas inside the housing 200 can be further improved when the battery 1 using the current collecting plate 100 has thermal runaway, thereby improving the sensitivity and stability of the explosion-proof valve 500.

[0066] In some embodiments, please refer to Figure 3 At least one through groove 13 is provided between two adjacent second welding structures 11, so as to further improve the internal gas flowability of the battery 1 using the current collecting plate 100.

[0067] The present application does not specifically limit the shape of the through groove 13 , and the shape of the through groove 13 may be, for example, circular, elliptical, square, triangular, or the like.

[0068] In the present application, the current collecting plate 100 is provided with a positioning groove 40. It is understandable that the positioning groove 40 may be provided on the first surface 10 or on the top surface of the second welding structure 11. In addition, the positioning groove 40 may be provided through the current collecting plate 100 in the up-down direction or may not be provided through the current collecting plate 100 in the up-down direction. In the present embodiment, the positioning groove 40 is provided on the top surface of the second welding structure 11 and penetrates the second welding structure 11 in the up-down direction. The provision of the positioning groove 40 can facilitate the positioning of the jig and prevent the current collecting plate 100 from rotating during welding.

[0069] The present application does not specifically limit the shape of the positioning groove 40 . The shape of the positioning groove 40 may be, for example, arc, circle, ellipse, square, triangle, etc.

[0070] In another embodiment of the present application, please refer to Figure 5 The second surface 30 is also provided with a supporting boss 32, which protrudes in a direction away from the first surface 10. Specifically, the supporting boss 32 protrudes downward, and the supporting boss 32 is used to contact the bottom wall of the housing 200. In this way, the second surface 30 and the bottom wall of the housing 200 can form a height difference, and the stability of the current collecting plate 100 can be improved after the current collecting plate 100 and the housing 200 are welded, and the shaking of the current collecting plate 100 caused by the vibration of the battery 1 can be reduced.

[0071] In some embodiments, at least one supporting boss 32 is disposed between two adjacent second welding structures 11. This arrangement can further improve the stability of the current collecting plate 100 after being welded to the housing 200.

[0072] In another embodiment of the present application, in the radial direction of the explosion-proof valve 500, the distance between the recess 20 and the explosion-proof valve 500 is less than or equal to 10 mm. The closer the distance between the recess 20 and the explosion-proof valve 500, the closer the distance between the first welding structure 31 and the explosion-proof valve 500. In this way, on the one hand, the welding radius can be reduced, thereby improving the welding efficiency. On the other hand, when the radius of the current collecting plate 100 is equal, the welding length of the current collecting plate 100 and the battery cell 1 in the first direction can be increased, and the first direction is the radial direction of the current collecting plate 100. In this way, the inner and outer circles of the battery cell 1 have a shorter conductive path, which is conducive to reducing the internal resistance.

[0073] It is worth mentioning that in the existing battery, the explosion-proof valve 500 is arranged on the cover plate of the end cover assembly 400. Since the middle part of the cover plate is used to install the pole, the explosion-proof valve 500 has to be eccentrically arranged on the cover plate, that is, the explosion-proof valve 500 is arranged in the edge area of ​​the cover plate. The current collecting plate electrically connected to the end cover assembly 400 needs to have a through hole for the gas inside the shell to flow and act on the explosion-proof valve 500. However, the through hole needs to be opened in the middle of the current collecting plate, because the edge area of ​​the current collecting plate is used to weld the battery cell 300. In this way, there is a gap between the current collecting plate and the explosion-proof valve 500 in the up and down directions to ensure that the explosion-proof valve 500 opens smoothly. In the battery 1 provided in the present application, the explosion-proof valve 500 is arranged in the middle of the bottom surface of the shell 200, the recess 20 is arranged in the middle of the current collecting plate 100, and the air permeable groove 21 is opened in the middle of the recess 20. In the up-down direction, the convex portion 240 is lower than the first surface 10, that is, there is a height difference between the battery cell 300 and the air hole 230. The setting of the concave portion 20 can not only reduce the heat transferred to the battery cell 300 when the current collecting plate 100 and the shell 200 are welded, but also provide space between the battery cell 300 and the explosion-proof valve 500 for gas circulation. Moreover, since there is no need to set an explosion-proof valve 500 on the end cover assembly 400, the current collecting plate electrically connected to the end cover assembly 400 does not need to reserve a gap for gas circulation, which effectively improves the space utilization rate inside the battery 1 in the up-down direction, thereby improving the energy density of the battery 1.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A current collecting plate, characterized in that: The collecting plate (100) comprises a first surface (10) and a second surface (30) which are arranged opposite to each other; the first surface (10) is recessed to form a recess (20); the recess (20) is provided with a venting groove (21) which passes through the recess (20); and the second surface (30) is provided with a welding area corresponding to the recess (20).

2. The collecting plate according to claim 1, characterized in that: The air permeable groove (21) is located in the middle of the current collecting plate (100).

3. The collecting plate according to claim 1, characterized in that: The recess (20) is in a continuous or discontinuous ring shape.

4. The collecting plate according to claim 1, characterized in that: The second surface (30) is provided with a first welding structure (31), the first welding structure (31) protrudes in a direction away from the first surface (10), and the first welding structure (31) is the welding area.

5. The collecting plate according to claim 1, characterized in that: The first surface (10) is provided with at least one second welding structure (11), and the second welding structure (11) protrudes in a direction away from the recess (20).

6. The collecting plate according to claim 5, characterized in that: At least two of the second welding structures (11) are provided, and the at least two second welding structures (11) are arranged at intervals along the circumference of the collecting plate (100), and two adjacent second welding structures (11) define a gas channel (12); And / or, the distance between the wall surface of the recess (20) close to the second surface (30) and the surface of the second welding structure (11) away from the second surface (30) is greater than or equal to 0.3 mm.

7. The collecting plate according to claim 1, characterized in that: The first surface (10) is also provided with at least one through groove (13) penetrating the current collecting plate (100); And / or, the collecting plate (100) is provided with a positioning groove (40).

8. The collecting plate according to claim 1, characterized in that: The second surface (30) is further provided with a supporting boss (32), and the supporting boss (32) protrudes in a direction away from the first surface (10); And / or, the ventilation groove (21) is a through hole.

9. A battery, characterized in that: The invention comprises a shell (200), a battery cell (1) and a current collecting plate (100) according to any one of claims 1 to 8, wherein the battery cell (1) is installed in the shell (200), an explosion-proof valve (500) is arranged in the middle of one end of the shell (200), the current collecting plate (100) is located between the battery cell (1) and the shell (200), and the air permeable groove (21) is arranged opposite to the explosion-proof valve (500).

10. The battery according to claim 9, characterized in that: The area of ​​the vent groove (21) is greater than or equal to the area of ​​the explosion-proof valve (500); And / or, in the radial direction of the explosion-proof valve (500), the distance between the recess (20) and the explosion-proof valve (500) is less than or equal to 10 mm.

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