Collecting plate and battery

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a collector plate which comprises a plate body, a first welding part and a second welding part, an air leakage hole is formed in the center of the disc body; the first welding part is arranged to be of a protruding structure on the disc body, the first welding part is arranged around the air leakage hole, and the height of the first welding part in the thickness direction of the disc body is larger than that of the disc body; the second welding part is arranged around the disc body, and the height of the second welding part in the thickness direction is lower than that of the first welding part in the thickness direction. According to the utility model, the current collecting disc is provided with the air leakage hole, so that air in the battery can circulate, the distance between the current collecting disc and the explosion-proof valve is reduced while the explosion-proof valve is matched to work, the space utilization rate of the battery is improved, and the energy density of the battery is further increased. In addition, the utility model also discloses a battery comprising the collector plate.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery production and manufacturing, and specifically relates to a current collecting plate and a battery. Background Art

[0002] Nowadays, with the development of modern society and the enhancement of people's environmental awareness, more and more devices choose lithium-ion batteries as power sources, such as mobile phones, laptops, power tools and electric vehicles, which provides a broad space for the application and development of lithium-ion batteries.

[0003] Among them, in order to be able to dissipate the internal high-pressure gas directly when the battery is over-voltage or the temperature is too high to achieve the purpose of explosion-proof, most batteries are equipped with explosion-proof valves. In the existing battery structure, whether the collector plate is connected to the battery housing or the battery pole, in order to achieve the pressure relief and explosion-proof function, there is a distance between the collector plate and the explosion-proof valve in the height direction, which reduces the space utilization rate in the height direction of the battery, thereby reducing the energy density of the battery. Therefore, it is urgent to propose a new technical solution to solve the above problems. Utility Model Content

[0004] One of the purposes of the utility model is to provide a collecting tray to address the deficiencies of the prior art. By arranging an air leakage hole at the center of the collecting tray, the assembly distance between the collecting tray and the explosion-proof valve in the height direction can be reduced, the space utilization rate in the height direction of the battery can be improved, and the energy density of the battery can be improved.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A collecting plate comprises a plate body, a first welding part and a second welding part; a vent hole is arranged at the center of the plate body; the first welding part is arranged as a raised structure on the plate body, the first welding part is arranged around the vent hole, and the height of the first welding part in the thickness direction of the plate body is higher than that of the plate body; the second welding part is arranged around the plate body, and the height of the second welding part in the thickness direction is lower than the height of the first welding part in the thickness direction.

[0007] As an improvement of the current collecting plate described in the utility model, there are multiple first welding parts, and the distances between the multiple first welding parts are equal.

[0008] As an improvement of the collecting disk described in the utility model, a connecting crack-stopping opening is provided at one end of the first welding portion away from the air leakage hole, and the connecting crack-stopping opening is located at the connection between the first welding portion and the circumferential edge of the disk body.

[0009] As an improvement on the current collecting plate described in the utility model, each of the first welding parts is provided with two connecting crack stop openings, and the two connecting crack stop openings are respectively located at the top corners of the first welding part away from the air leakage hole; since the first welding part is provided as a raised structure, a space will be formed with the top or bottom of the battery shell in actual application, and the connecting crack stop opening can make the formed space connected with the inside of the battery, ensuring gas circulation, and at the same time, the connecting crack stop opening is provided as an arc structure, which can prevent the current collecting plate from being broken due to vibration.

[0010] As an improvement of the current collecting plate described in the utility model, the plate body and the first welding part do not overlap each other, a weight reduction area is provided on the plate body, and weight reduction holes are provided on the weight reduction area. The weight reduction holes are used to further reduce the weight of the current collecting plate and improve the battery energy density.

[0011] As an improvement of the collecting plate described in the utility model, a plurality of the weight-reducing holes are provided, the plurality of the weight-reducing holes are arranged around the air leakage holes, and the plurality of the weight-reducing holes and the plurality of the first welding parts are interspersed.

[0012] In actual applications, the collecting plate is close to one end of the shell on which the explosion-proof valve is installed, the first welding part is used to electrically connect with the pole ear of the battery, and the weight-reducing hole is located between the first welding part and the second welding part in the height direction of the battery, and serves as a channel for connecting the internal gas of the battery to ensure the realization of the pressure relief function of the explosion-proof valve.

[0013] As an improvement of the current collecting plate described in the utility model, a vertical extension body is provided on the second welding portion extending toward the first welding portion, and the vertical extension body is located on a side of the second welding portion close to the plate body.

[0014] As an improvement of the current collecting plate described in the utility model, the second welding portion is connected to the first welding portion through the vertical extension body, the vertical extension body and the connecting crack-stopping opening do not overlap with each other, and the first welding portion and the second welding portion form a height difference to prevent the heat generated during welding from being directly transferred to the pole ear, causing damage or failure.

[0015] In other technical solutions, the second welding portion is connected to the disk body through the vertical extension body, and the vertical extension body and the connecting crack-stopping opening do not overlap with each other. The weight-reducing hole can not only play a weight-reducing role, but also enable the weight-reducing area to quickly melt when the battery has thermal runaway, so that the second welding portion is separated from the disk body, and the connection between the pole or shell and the battery cell is cut off in time, thereby increasing the safety of the battery.

[0016] In other technical solutions, one end of the first welding portion away from the air leakage hole extends outward to form an extension portion, the extension portion is connected to the second welding portion through a bending part, and the extension portion is located above the second welding portion in the thickness direction.

[0017] As an improvement of the current collecting disk described in the utility model, a fuse hole is provided on the extension portion, and the fuse hole can quickly melt when thermal runaway occurs in the battery, so that the extension portion is separated from the disk body, and the connection between the pole or shell and the battery cell is cut off in time, thereby increasing the safety of the battery.

[0018] The second objective of the present utility model is to provide a battery, comprising the current collecting plate as described above.

[0019] As an improvement of the battery of the utility model, the area of ​​the air leakage hole is 90% to 110% of the area of ​​the corresponding explosion-proof valve installed, which allows the internal gas of the battery to circulate while maximally satisfying the pressure relief function of the explosion-proof valve.

[0020] The beneficial effects of the utility model are:

[0021] (1) The current collecting disk of the utility model includes a disk body, a first welding part and a second welding part; an air leakage hole is arranged at the center of the disk body; the first welding part is arranged as a protruding structure on the disk body, the first welding part is arranged around the air leakage hole, and the height of the first welding part in the thickness direction of the disk body is higher than that of the disk body; the second welding part is arranged around the disk body, and the height of the second welding part in the thickness direction is lower than the height of the first welding part in the thickness direction. The current collecting disk in the utility model is provided with an air leakage hole, which can ensure the gas circulation in the battery, so that the explosion-proof valve can be opened smoothly to relieve pressure when thermal runaway occurs, thereby reducing the distance in the height direction between the current collecting disk and the explosion-proof valve, improving the space utilization rate in the height direction of the battery, and thereby improving the energy density of the battery;

[0022] (2) In practical applications, the first welding portion and the second welding portion in the utility model are respectively welded to the pole ear and the pole column or the pole ear and the shell, and a height difference is formed between the first welding portion and the second welding portion, which can prevent the heat generated during the welding process from being directly transferred to the pole ear, thereby preventing damage or failure of components. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0024] Figure 1 It is a structural schematic diagram of implementation mode 1 of the present utility model.

[0025] Figure 2 It is a structural schematic diagram of implementation mode 2 of the present utility model.

[0026] Figure 3 This is a schematic structural diagram of implementation mode 3 of the present utility model.

[0027] The reference numerals are described as follows:

[0028] 1-disc body; 10-air venting hole; 2-first welding part; 21-connecting crack stop opening; 3-second welding part; 4-weight reduction area;

[0029] 100 - vertical extension body;

[0030] 200- extension part; 201- bending part; 202- fuse hole;

[0031] T - thickness direction. DETAILED DESCRIPTION

[0032] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criterion for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0034] In the utility model, 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0035] The following is combined with Figures 1 to 3 The utility model is further described in detail with specific implementation modes, but is not intended to limit the utility model.

[0036] Implementation Method 1

[0037] The following is combined with Figure 1 Description of Implementation Method 1

[0038] A collecting plate comprises a plate body 1, a first welding part 2 and a second welding part 3, wherein an air venting hole 10 is arranged at the center of the plate body 1; the first welding part 2 is arranged as a protruding structure on the plate body 1, the first welding part 2 is arranged around the air venting hole 10, and the height of the first welding part 2 in the thickness direction T of the plate body 1 is higher than that of the plate body 1; the second welding part 3 is arranged around the plate body 1, and the height of the second welding part 3 in the thickness direction T is lower than the height of the first welding part 2 in the thickness direction T.

[0039] Compared with the existing solution in which the current collecting plate is set as a plate without holes, the current collecting plate of the present application is provided with a vent hole 10 at the center, so that air can circulate inside the battery in actual application. When thermal runaway occurs, there is no need to leave a distance between the current collecting plate and the explosion-proof valve to ensure the pressure relief function of the explosion-proof valve, which can better utilize the internal space of the battery and improve the energy density of the battery.

[0040] Preferably, a connecting crack stop opening 21 is provided at one end of the first welding part 2 away from the air leakage hole 10, and the connecting crack stop opening 21 is located at the connection between the first welding part 2 and the circumferential edge of the disk body 1. Each first welding part 2 is provided with two connecting crack stop openings 21, and the two connecting crack stop openings 21 are respectively located at the top corners of the first welding part 2 away from the air leakage hole 10.

[0041] In the battery structure, since the first welding portion 2 is set as a raised structure, a space will be formed with the top or bottom of the battery shell. The connecting crack-stopping opening 21 can make the formed space connected with the inside of the battery, ensuring gas circulation. At the same time, the setting of the arc structure of the connecting crack-stopping opening 21 can prevent the occurrence of rupture caused by vibration of the collecting plate.

[0042] Preferably, the disk body 1 and the first welding portion 2 do not overlap with each other, and a weight-reducing area 4 is provided on the disk body 1, and a weight-reducing hole is provided on the weight-reducing area 4. There are multiple weight-reducing holes, and the multiple weight-reducing holes are arranged around the air leakage hole 10, and the multiple weight-reducing holes and the multiple first welding portions 2 are interspersed. The weight-reducing holes can reduce the weight of the collecting disk, thereby making the battery lighter and further improving the energy density of the battery.

[0043] Preferably, there are multiple first welding parts 2, and the distances between the multiple first welding parts 2 are equal. The second welding part 3 is extended toward the first welding part 2 and is provided with a vertical extension body 100. The vertical extension body 100 is located on the side of the second welding part 3 close to the disk body 1. The second welding part 3 is connected to the first welding part 2 through the vertical extension body 100, and the vertical extension body 100 and the connecting crack stopping opening 21 do not overlap with each other.

[0044] In actual applications, the collecting plate is close to the shell on which one end of the explosion-proof valve is installed. The first welding part 2 and the second welding part 3 are respectively welded to the pole ear and the pole column or the pole ear and the shell or the pole ear and other connecting parts. The first welding part 2 and the second welding part 3 form a height difference, which can prevent the heat generated during the welding process from being directly transferred to the pole ear, thereby preventing damage or failure of components. The weight reduction hole is located between the first welding part 2 and the second welding part 3 in the height direction, and serves as a channel for connecting the internal gas of the battery to ensure the realization of the pressure relief function of the explosion-proof valve.

[0045] Implementation Method 2

[0046] like Figure 2 As shown, different from the first embodiment, the second welding portion 3 of this embodiment is connected to the disk body 1 through the vertical extension body 100, the vertical extension body 100 and the connecting stop crack opening 21 do not overlap each other, and the second welding portion 3 is connected to the weight reduction area 4. When thermal runaway occurs, the weight reduction area 4 quickly melts, so that the second welding portion 3 is separated from the disk body 1, and the connection between the pole or shell and the battery cell is cut off in time, thereby increasing the safety of the battery.

[0047] The other structures are the same as those in the first embodiment and will not be described in detail here.

[0048] Implementation Method 3

[0049] like Figure 3 As shown, different from the first embodiment, in this embodiment, one end of the first welding portion 2 away from the air leakage hole 10 extends outward to form an extension portion 200, and the extension portion 200 is connected to the second welding portion 3 through a bending piece 201. The extension portion 200 is located above the second welding portion 3 in the thickness direction T, and a fuse hole 202 is provided on the extension portion 200; the bending piece 201 further isolates the first welding portion 2 and the second welding portion 3, and the fuse hole 202 can make the extension portion 200 quickly fuse when thermal runaway occurs, so that the second welding portion 3 is separated from the disk body 1, and the connection between the pole or the shell and the battery cell is cut off in time, thereby increasing the safety of the battery.

[0050] The other structures are the same as those in the first embodiment and will not be described again here.

[0051] Battery

[0052] Including the above-mentioned current collecting plate, the battery can be a lithium ion battery, a sodium ion battery, a magnesium ion battery, etc.

[0053] The area of ​​the vent hole 10 is 90%, 100% or 110% of the area of ​​the corresponding explosion-proof valve installed, which allows the internal gas of the battery to circulate while maximizing the pressure relief function of the explosion-proof valve. However, the vent hole 10 is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0054] Electrical devices,

[0055] Including the above-mentioned battery, the power-consuming device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. The implementation method of this application does not impose any special restrictions on the above-mentioned power-consuming devices.

[0056] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. A collecting plate, characterized in that: include: A disc body (1), wherein a vent hole (10) is provided at the center of the disc body (1); A first welding portion (2) is provided as a protruding structure on the disc body (1), the first welding portion (2) is provided around the air leakage hole (10), and the height of the first welding portion (2) in the thickness direction (T) of the disc body (1) is higher than that of the disc body (1); A second welding portion (3), the second welding portion (3) is arranged around the disc body (1), and the height of the second welding portion (3) in the thickness direction (T) is lower than the height of the first welding portion (2) in the thickness direction (T).

2. The collecting plate according to claim 1, characterized in that: There are a plurality of first welding portions (2), and the distances between the plurality of first welding portions (2) are equal.

3. The collecting plate according to claim 1, characterized in that: A connecting crack-stopping opening (21) is provided at one end of the first welding portion (2) away from the air leakage hole (10), and the connecting crack-stopping opening (21) is located at the connection between the first welding portion (2) and the circumferential edge of the disc body (1).

4. The collecting plate according to claim 3, characterized in that: Each of the first welding parts (2) is provided with two communicating crack-stopping openings (21), and the two communicating crack-stopping openings (21) are respectively located at the top corners of the first welding part (2) away from the air leakage hole (10).

5. The collecting plate according to claim 1, characterized in that: The disc body (1) and the first welding portion (2) do not overlap each other, a weight reduction area (4) is provided on the disc body (1), and a weight reduction hole is provided on the weight reduction area (4).

6. The collecting plate according to claim 5, characterized in that: A plurality of the weight-reducing holes are provided, the plurality of the weight-reducing holes are arranged around the air leakage hole (10), and the plurality of the weight-reducing holes and the plurality of the first welding parts (2) are interspersed with each other.

7. The collecting plate according to claim 3, characterized in that: The second welding portion (3) is provided with a vertical extension body (100) extending in the direction of the first welding portion (2), and the vertical extension body (100) is located on a side of the second welding portion (3) close to the disc body (1).

8. The collecting plate according to claim 7, characterized in that: The second welding portion (3) is connected to the first welding portion (2) via the vertical extension body (100), and the vertical extension body (100) and the communicating crack-stopping opening (21) do not overlap with each other.

9. The collecting plate according to claim 7, characterized in that: The second welding portion (3) is connected to the disc body (1) via the vertical extension body (100), and the vertical extension body (100) and the communicating crack-stopping opening (21) do not overlap with each other.

10. The current collecting plate according to any one of claims 1 to 6, characterized in that: One end of the first welding portion (2) away from the air leakage hole (10) extends outward to form an extension portion (200), the extension portion (200) is connected to the second welding portion (3) via a bending piece (201), and the extension portion (200) is located above the second welding portion (3) in the thickness direction (T).

11. The collecting plate according to claim 10, characterized in that: The extension portion (200) is provided with a fuse hole (202).

12. A battery, characterized in that: The collecting plate comprises the current collecting plate as claimed in any one of claims 1 to 11.

13. The battery according to claim 12, characterized in that The collecting plate is provided with an air leakage hole (10), and the area of ​​the air leakage hole (10) is 90% to 110% of the area of ​​the corresponding installed explosion-proof valve.

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