Collecting plate and cylindrical battery

Abstract

The utility model provides a collector plate and a cylindrical battery. The collector plate comprises a collector plate body, a first welding surface is arranged on the bottom wall of the collector plate body, and a second welding surface is arranged on the side wall of the collector plate body; the flow collecting disc comprises a flow collecting disc body and a gas guide pipe, the flow collecting disc body is provided with a vent hole, the gas guide pipe is provided with a gas guide channel communicated with the vent hole, and the gas guide pipe is used for being inserted into the gas guide hole of the roll core. By arranging the first welding face and the second welding face, the problem that the collecting plate is bent and deformed in the welding process of the collecting plate is avoided, the gas guide pipe is arranged on the back side of the collecting plate body, the gas guide pipe is provided with the gas guide channel and inserted into the gas guide hole of the roll core, and the gas guide hole of the roll core is kept unblocked through the gas guide channel. The shielding problem of the air guide hole of the roll core is avoided, high-temperature and high-pressure gas generated when the battery is subjected to thermal runaway can be discharged in time, and the safety of the battery is improved while the welding effect is ensured.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery collector plates, and in particular to a collector plate and a cylindrical battery. Background Art

[0002] The battery collector plate is the carrier for collecting current in cylindrical batteries. The connection between the battery collector plate, the pole ear and the shell is usually made by laser welding. However, many previous collector plate structures were not reasonable, which led to the collector plate being easily deformed during the welding process, resulting in cold welding or unreliable welding between the collector plate and the positive pole ear or shell, increasing the internal resistance of the battery and weakening the battery's current carrying capacity.

[0003] In order to solve the above problems, a Chinese patent with application number CN202321629579.9 discloses a collector plate, including a collector plate body, the side of the collector plate body is provided with a folded edge, the folded edge is provided with a notch, and the folded edge faces the back side of the collector plate body; reinforcing ribs, the reinforcing ribs are arranged on the back side of the collector plate body, and the height of the reinforcing ribs is less than the height of the folded edge. In the utility model, when the back side of the collector plate body is laser welded to the pole ear, the reinforcing ribs can play a certain supporting role to prevent the collector plate body from deforming, and when the folded edge of the collector plate body is welded to the battery shell, the notch can release a certain stress during the welding process with the shell to ensure the welding effect.

[0004] The above-mentioned collector plate is provided with a folded edge on the side of the collector plate body and a reinforcing rib on the back side of the collector plate body to ensure that the collector plate will not be deformed during welding and the welding effect is good. However, during the welding process of the collector plate, the central hole of the winding core is easily blocked by the pole ear or the collector plate, so that the gas guide channel of the battery is blocked, resulting in the inability to effectively discharge the high-temperature and high-pressure gas when the battery thermal runaway occurs, and then the battery explodes, causing safety hazards.

[0005] Therefore, there is a need for a current collecting disk that can ensure that the current collecting disk is firmly welded and avoid the problem of the central hole of the winding core being blocked during welding. Utility Model Content

[0006] The purpose of the present disclosure is to overcome the deficiencies in the prior art and to provide a current collecting disk that can ensure that the current collecting disk is firmly welded and avoid the problem of the central hole of the winding core being blocked during welding.

[0007] The purpose of this disclosure is achieved through the following technical solutions:

[0008] A current collecting plate comprises a current collecting plate body, wherein the bottom wall of the current collecting plate body is provided with a first welding surface, and the side wall of the current collecting plate body is provided with a second welding surface, wherein the first welding surface is used for welding to a winding core, and the second welding surface is used for welding to a shell;

[0009] The collecting plate body is provided with an air vent, and the collecting plate further comprises an air guide tube, which is protruding from the bottom wall of the collecting plate body and provided with an air guide channel connected with the air vent, and the air guide tube is used to be inserted into the air guide hole of the winding core.

[0010] In one embodiment, there are a plurality of the first welding surfaces, and the plurality of the first welding surfaces are distributed at intervals along the circumferential direction of the bottom wall of the collecting plate body.

[0011] In one embodiment, there are a plurality of the second welding surfaces, and the plurality of the second welding surfaces are circumferentially spaced and distributed along the side wall of the collecting plate body.

[0012] In one embodiment, each of the first welding surfaces and each of the second welding surfaces are staggered along the circumferential direction of the current collecting plate body.

[0013] In one embodiment, the air duct is disposed at the exact center of the collecting plate body; and / or,

[0014] The air guide pipe and the collecting plate body are an integrally formed structure.

[0015] In one of the embodiments, the collecting plate body is provided with a liquid injection hole.

[0016] In one embodiment, there are a plurality of the injection holes, and the plurality of injection holes are arranged at intervals in the circumferential direction of the collecting plate body.

[0017] In one of the embodiments, the collecting plate is an aluminum alloy collecting plate.

[0018] A cylindrical battery comprises a shell, a winding core and a current collecting plate as described in any of the above embodiments, wherein the winding core is welded to the first welding surface, the shell is welded to the second welding surface, the winding core is provided with an air guide hole, the air guide tube is inserted into the air guide hole, and the air guide hole is connected to the air guide channel.

[0019] In one embodiment, when the current collecting disc is a positive electrode current collecting disc, the shell is an aluminum alloy shell or a steel shell, and the current collecting disc is an aluminum alloy current collecting disc; or,

[0020] When the current collecting disk is a negative electrode current collecting disk, the shell is a steel shell, and the current collecting disk is a copper current collecting disk.

[0021] Compared with the prior art, the present invention has at least the following advantages:

[0022] The above-mentioned current collecting plate is welded to the winding core through the first welding surface and the second welding surface is welded to the battery shell, so as to ensure the welding effect of the current collecting plate and avoid the problem of bending and deformation of the current collecting plate during the welding process. In addition, an air duct is provided on the bottom wall of the current collecting plate body, and the air duct is provided with an air guide channel. The air duct is inserted into the air guide holes of the winding core. When welding the current collecting plate, the air guide holes of the winding core are kept unobstructed through the air guide channel, thereby avoiding the problem of blocking the air guide holes of the winding core. When the battery has thermal runaway, the high-temperature and high-pressure gas generated can be discharged in time, thereby ensuring the welding effect and improving the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic structural diagram of a current collecting plate according to an embodiment;

[0025] Figure 2 for Figure 1 Another structural schematic diagram of the current collecting plate shown;

[0026] Figure 3 To include Figure 1 A schematic diagram of the structure of a cylindrical battery with a current collecting plate shown;

[0027] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of a cylindrical battery shown. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] The present disclosure provides a collecting tray, including a collecting tray body, the bottom wall of the collecting tray body is provided with a first welding surface, the side wall of the collecting tray body is provided with a second welding surface, the first welding surface is used for welding to a winding core, and the second welding surface is used for welding to a shell; the collecting tray body is provided with an air vent, the collecting tray also includes an air duct, the air duct is protruding from the bottom wall of the collecting tray body, the air duct is provided with an air channel connected with the air vent, and the air duct is used to be inserted into the air vent of the winding core.

[0032] The above-mentioned current collecting plate is welded to the winding core through the first welding surface and the second welding surface is welded to the battery shell, so as to ensure the welding effect of the current collecting plate and avoid the problem of bending and deformation of the current collecting plate during the welding process. In addition, an air duct is provided on the bottom wall of the current collecting plate body, and the air duct is provided with an air guide channel. The air duct is inserted into the air guide holes of the winding core. When welding the current collecting plate, the air guide holes of the winding core are kept unobstructed through the air guide channel, thereby avoiding the problem of blocking the air guide holes of the winding core. When the battery has thermal runaway, the high-temperature and high-pressure gas generated can be discharged in time, thereby ensuring the welding effect and improving the safety of the battery.

[0033] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0034] like Figure 1 and Figure 2 As shown, a collecting plate 10 of an embodiment includes a collecting plate body 100, the bottom wall of the collecting plate body is provided with a first welding surface 200, the side wall of the collecting plate body is provided with a second welding surface 300, the first welding surface 200 is used for welding to the winding core, and the second welding surface 300 is used for welding to the shell; the collecting plate body is provided with an air vent 1001, and the collecting plate also includes an air duct 400, the air duct 400 is protruding from the bottom wall of the collecting plate body 100, the air duct 400 is provided with an air duct channel 401 connected with the air vent 1001, and the air duct 400 is used to be inserted into the air duct hole of the winding core.

[0035] In this embodiment, the current collecting plate 10 includes a current collecting plate body 100, a first welding surface 200 and a second welding surface 300. The first welding surface 200 is arranged parallel to the surface side of the current collecting plate body 100, and the second welding surface 300 is arranged perpendicular to the surface side of the current collecting plate body 100, that is, the first welding surface 200 and the second welding surface 300 are arranged perpendicular to each other; the back side of the current collecting plate body 100 is provided with an air guide tube 400, and the air guide tube 400 is provided with an air guide channel 401. When welding the current collecting plate 10, firstly insert the air guide tube 400 into the air guide hole position of the winding core, so that the air guide hole is always kept unobstructed through the air guide channel 401, and at the same time, the current collecting plate 10 is initially fixed, and then the first welding surface 200 and the winding core are welded, and the second welding surface 300 and the battery shell are welded, so that the current collecting plate is welded and fixed.

[0036] The above-mentioned current collecting plate 10 is welded to the winding core through the first welding surface 200 and the second welding surface 300 is welded to the battery shell, so as to ensure the welding effect of the current collecting plate 10 and avoid the problem of bending and deformation of the current collecting plate 10 during the welding process. In addition, the bottom wall of the current collecting plate body 100 is provided with an air guide tube 400, and the air guide tube 400 is provided with an air guide channel 401. The air guide tube 400 is inserted into the air guide holes of the winding core. When welding the current collecting plate 10, the air guide holes of the winding core are kept unobstructed through the air guide channel 401, thereby avoiding the problem of blocking the air guide holes of the winding core. When the battery has thermal runaway, the high temperature and high pressure gas generated can be discharged in time, thereby ensuring the welding effect and improving the safety of the battery.

[0037] like Figure 1 and Figure 2 As shown, in one embodiment, there are multiple first welding surfaces 200, and the multiple first welding surfaces 200 are distributed at intervals along the circumferential direction of the bottom wall of the current collecting plate body 100. In this embodiment, by providing multiple first welding surfaces 200, the welding effect between the current collecting plate 10 and the winding core is improved, so that the current collecting plate 10 is welded firmly.

[0038] like Figure 1 and Figure 2 As shown, in one embodiment, there are multiple second welding surfaces 300, and the multiple second welding surfaces 300 are distributed at intervals along the circumferential direction of the side wall of the current collecting plate body 100. In this embodiment, by providing multiple second welding surfaces 300, the welding effect between the current collecting plate 10 and the battery housing is improved, so that the current collecting plate 10 is welded firmly.

[0039] like Figure 1 and Figure 2As shown, in one embodiment, each first welding surface 200 and each second welding surface 300 are staggered. In this embodiment, the first welding surface 200 and the second welding surface 300 are staggered, so that when the current collecting plate 10 is welded, the force of the current collecting plate body 100 is uniform, which further improves the welding quality of the current collecting plate 10 and ensures that the current collecting plate 10 is welded firmly.

[0040] like Figure 1 and Figure 2 As shown, in one embodiment, the air duct 400 is arranged at the exact center of the collector plate body 100. In this embodiment, the air duct 400 is located at the exact center of the collector plate body 100. During welding, the air duct 400 is inserted into the air duct hole at the center of the winding core, and the collector plate 10 is fixed at the center of the battery, which facilitates the subsequent welding of the first welding surface 200 and the second welding surface 300. Furthermore, the air duct 400 and the collector plate body 100 are an integrally formed structure. In other embodiments, the air duct 400 and the collector plate body 100 can also be connected by other methods such as welding and bonding.

[0041] like Figure 1 and Figure 2 As shown, in one embodiment, a liquid injection hole 101 is further provided on the surface of the current collecting disc body 100. In this embodiment, a liquid injection hole 101 is further provided on the surface of the current collecting disc body 100, and the liquid injection hole 101 is used for the electrolyte to infiltrate the winding core from the end surface of the winding core to ensure the charging and discharging performance of the battery.

[0042] like Figure 1 and Figure 2 As shown, in one embodiment, there are multiple injection holes 101, and the multiple injection holes 101 are spaced apart and arranged in the circumference of the current collecting plate body 100. In this embodiment, the multiple injection holes 101 are spaced apart and arranged in the circumference of the current collecting plate body 100. By opening the multiple injection holes 101, the surface area of ​​the winding core infiltrated by the electrolyte is increased, the infiltration effect is improved, and the charging and discharging performance of the battery is further guaranteed.

[0043] like Figure 1 and Figure 2 As shown, in one embodiment, the current collecting plate 10 is an aluminum alloy current collecting plate. In this embodiment, the current collecting plate 10 is made of aluminum alloy, and the aluminum alloy material has good welding effect and excellent welding performance. The current collecting plate 10 made of aluminum alloy is welded with the winding core and the shell of the battery, so that the welding is reliable.

[0044] The present application also provides a cylindrical battery 20, such as Figure 3 and Figure 4As shown, in one embodiment, the cylindrical battery 20 includes a shell 21, a winding core 22 and a current collecting plate 10 of any of the above embodiments, the winding core 22 is welded to the first welding surface 200, the shell 21 is welded to the second welding surface 300, the winding core 22 is provided with an air guide hole 2201, the air guide tube 400 is inserted into the air guide hole 2201, and the air guide hole 2201 is connected to the air guide channel 401. In this embodiment, the first welding surface 200 is welded to the winding core 22, and the second welding surface 300 is welded to the shell 21. By setting the first welding surface 200 and the second welding surface 300, the problem that the current collecting plate 10 may be bent and deformed when welding the current collecting plate 10 is avoided. At the same time, the air guide hole 2201 is connected to the air guide channel 401, that is, the air guide tube 400 on the back side of the current collecting plate 10 ensures that the air guide hole 2201 is unobstructed, and the high-temperature and high-pressure gas generated when the battery thermal runaway occurs can be discharged in time, thereby improving the safety of the cylindrical battery 20.

[0045] like Figure 3 and Figure 4 As shown, in one embodiment, when the current collecting disc 10 is a positive current collecting disc, the shell 21 is an aluminum alloy shell or a steel shell, and the current collecting disc 10 is an aluminum alloy current collecting disc. In this embodiment, the shell 21 is made of aluminum alloy. The shell 21 made of aluminum alloy has high impact resistance and high protection ability, and can effectively protect the battery structure. The aluminum alloy material has good welding effect and excellent welding performance, so that the shell 21 and the current collecting disc 10 are firmly welded. In other embodiments, the current collecting disc 10 is not limited to a positive current collecting disc. In one embodiment, when the current collecting disc 10 is a negative current collecting disc, the shell 21 is a steel shell, and the current collecting disc 10 is a copper current collecting disc.

[0046] Compared with the prior art, the present invention has at least the following advantages:

[0047] The above-mentioned current collecting plate 10 is welded to the winding core 22 through the first welding surface 200 and the second welding surface 300 is welded to the battery shell, so as to ensure the welding effect of the current collecting plate 10 and avoid the problem of bending and deformation of the current collecting plate 10 during the welding process. In addition, the bottom wall of the current collecting plate body 100 is provided with an air guide tube 400, and the air guide tube 400 is provided with an air guide channel 401. The air guide tube 400 is inserted into the air guide hole 2201 of the winding core 22. When welding the current collecting plate 10, the air guide hole 2201 of the winding core 22 is kept unobstructed through the air guide channel 401, thereby avoiding the problem of blocking the air guide hole 2201 of the winding core 22. When the battery has thermal runaway, the high temperature and high pressure gas generated can be discharged in time, thereby ensuring the welding effect and improving the safety of the battery.

[0048] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be based on the attached claims.

Claims

1. A current collecting plate, comprising a current collecting plate body, wherein the bottom wall of the current collecting plate body is provided with a first welding surface, and the side wall of the current collecting plate body is provided with a second welding surface, wherein the first welding surface is used for welding to a winding core, and the second welding surface is used for welding to a shell, wherein: The collecting plate body is provided with an air vent, and the collecting plate further comprises an air guide tube, which is protruding from the bottom wall of the collecting plate body and provided with an air guide channel connected with the air vent, and the air guide tube is used to be inserted into the air guide hole of the winding core.

2. The collecting plate according to claim 1, characterized in that: There are a plurality of the first welding surfaces, and the plurality of the first welding surfaces are distributed at intervals along the circumferential direction of the bottom wall of the current collecting plate body.

3. The collecting plate according to claim 2, characterized in that: There are a plurality of the second welding surfaces, and the plurality of the second welding surfaces are distributed at intervals along the circumferential direction of the side wall of the collecting plate body.

4. The collecting plate according to claim 3, characterized in that: Each of the first welding surfaces and each of the second welding surfaces are staggered along the circumferential direction of the current collecting plate body.

5. The collecting plate according to claim 1, characterized in that: The air guide pipe is arranged at the center of the collecting plate body; and / or, The air guide pipe and the collecting plate body are an integrally formed structure.

6. The collecting plate according to claim 1, characterized in that: The collecting plate body is provided with a liquid injection hole.

7. The collecting plate according to claim 6, characterized in that: There are a plurality of the injection holes, and the plurality of the injection holes are arranged at intervals in the circumferential direction of the collecting plate body.

8. The collecting plate according to claim 1, characterized in that: The current collecting plate is an aluminum alloy current collecting plate.

9. A cylindrical battery, characterized in that: It includes a shell, a winding core and a collecting plate according to any one of claims 1 to 8, the winding core is welded to the first welding surface, the shell is welded to the second welding surface, the winding core is provided with an air guide hole, the air guide tube is inserted into the air guide hole, and the air guide hole is connected to the air guide channel.

10. The cylindrical battery according to claim 9, characterized in that: When the current collecting disc is a positive electrode current collecting disc, the shell is an aluminum alloy shell or a steel shell, and the current collecting disc is an aluminum alloy current collecting disc; or, When the current collecting disk is a negative electrode current collecting disk, the shell is a steel shell, and the current collecting disk is a copper current collecting disk.

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