Collecting disc, cover plate structure and cylindrical battery

Abstract

The utility model provides a collector plate, a cover plate structure and a cylindrical battery. The current collecting plate comprises a current collecting plate body, a plurality of flow guide plates and a plurality of flow guide plates, a cutting groove is formed in the collector plate body; one end of the cutting groove penetrates through the collector plate body so as to divide the collector plate body into a connecting part and a fixing part; and the cutting grooves of the flow collecting plate body are used for deforming when the pressure is increased so as to enlarge gaps of the cutting grooves. The cylindrical battery is subjected to thermal runaway to generate a large amount of gas, so that the cutting grooves of the collector plate body are pressed and deformed, the gaps of the cutting grooves are enlarged, the gas guide property is improved, and the problem of battery core pressure relief during thermal runaway is solved. And through the design of the two cutting grooves, the connecting part is bent along the tail ends of the two cutting grooves in the assembly process of the cover plate, the battery roll core and the battery shell, so that the interference between the cover plate and the battery shell can be avoided, and the connecting part can be recovered after the cover plate and the battery shell are welded.

Description

Technical Field

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

[0002] Cylindrical batteries are batteries that can be recharged after discharge to reactivate the active material and continue to function. They are widely used in solar lamps, lawn lamps, backup energy sources, power tools, toys, and photovoltaic energy. Cylindrical batteries primarily consist of a cover plate, a current collecting plate, and a winding core. The current collecting plate is connected to the cover plate and winding core.

[0003] To increase the capacity of cylindrical batteries, it is necessary to expand the space, either by increasing the diameter or the height. However, increasing the diameter has limitations, which will cause the core to be bloated, poor infiltration, and reduce the winding efficiency. Therefore, the height can be increased, but increasing the height will create a technical difficulty, that is, the pressure relief and exhaust will not be smooth during thermal runaway, which makes thermal runaway prone to explosion. Utility Model Content

[0004] In view of the above problems existing in the prior art, the technical problem to be solved by the present invention is that when the height of cylindrical batteries is increased, a technical difficulty will arise, that is, the pressure relief and exhaust will not be smooth during thermal runaway, which will lead to thermal runaway and easy explosion.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: a collecting plate, comprising:

[0006] The collecting plate body is provided with a groove; one end of the groove passes through the collecting plate body to separate the collecting plate body into a connecting portion and a fixing portion; and the groove of the collecting plate body is used to deform when the pressure increases to increase the gap of the groove.

[0007] Preferably, two cutting grooves are provided, and the two cutting grooves are symmetrically arranged on both sides of the axis of the collecting plate body.

[0008] Preferably, an exhaust groove is further provided on the collecting plate body, and the exhaust groove is located below the explosion-proof valve.

[0009] Preferably, a welding area is further provided on the collecting plate body.

[0010] Preferably, a bending hole is provided at the connection between the connecting portion and the fixing portion, and the bending hole is located on the groove.

[0011] Preferably, the connecting portion is provided with reinforcing ribs, which are arranged along the length direction of the groove.

[0012] Preferably, the collecting plate body is provided with a plurality of through holes arranged at intervals.

[0013] A cover plate structure, comprising:

[0014] substrate;

[0015] an explosion-proof valve mounted on the substrate; and

[0016] A current collecting plate as described above is installed below the base plate.

[0017] Preferably, an explosion-proof valve protective film is provided on a side of the explosion-proof valve away from the collecting plate, and the explosion-proof valve protective film is installed on the substrate.

[0018] A cylindrical battery comprising:

[0019] housing; and

[0020] Any one of the above-mentioned battery cover structures is mounted on the housing.

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

[0022] In the utility model, after the collecting plate body is installed in the cylindrical battery, when the cylindrical battery has thermal runaway, a large amount of gas is generated in the cylindrical battery. Under the action of the gas pressure, the groove of the collecting plate body is compressed and deformed, thereby increasing the gap of the groove; thereby increasing the gas conductivity, solving the problem of battery cell pressure release during thermal runaway, and improving battery safety performance.

[0023] In the present invention, the collecting plate body is separated into a bendable connecting portion through the groove design, so that during the assembly process of the cover plate, the battery coil core and the battery shell, the connecting portion can be bent along the tail end of the groove, thereby avoiding interference between the cover plate and the battery shell. After the cover plate and the battery shell are welded, the connecting portion can be restored. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the specific embodiments. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0025] Figure 1 This is an exploded view of the cover structure provided in an embodiment of the present invention.

[0026] Figure 2 This is a three-dimensional diagram of the collecting plate provided in an embodiment of the present utility model.

[0027] Reference numerals:

[0028] 10-collecting plate body, 11-cutting groove, 12-connecting part, 13-fixing part, 14-exhaust groove, 15-welding area, 16-bending cutting hole, 17-reinforcement rib, 18-through hole, 20-base plate, 30-explosion-proof valve, 40-explosion-proof valve protective film. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0030] In the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships 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 should not be understood as a limitation to the present invention.

[0031] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] See also Figure 1-Figure 2 The present invention provides an embodiment of a current collecting plate, comprising: a current collecting plate body 10, with a groove 11 formed on the current collecting plate body 10; one end of the groove 11 passes through the current collecting plate body 10 to separate the current collecting plate body 10 into a connecting portion 12 and a fixing portion 13; the groove 11 of the current collecting plate body 10 is used to deform when the pressure increases to increase the gap of the groove 11; the setting of the groove 11 makes it easier for the current collecting plate body 10 at the groove 11 to deform.

[0033] In practice, after the collector plate body 10 is installed in a cylindrical battery, when the cylindrical battery experiences thermal runaway, a large amount of gas is generated within the cylindrical battery. Under the action of gas pressure, the groove 11 of the collector plate body 10 is compressed and deformed, thereby increasing the gap of the groove 11. This increases gas conductivity, solves the problem of battery cell pressure release during thermal runaway, and improves battery safety. Furthermore, the design of the groove 11 separates the collector plate body 10 into a bendable connection portion 12. During the assembly of the cover plate, battery coil, and battery case, the connection portion 12 can be bent to prevent interference between the cover plate and the battery case. After the cover plate and battery case are welded, the connection portion 12 can be bent back to its original shape.

[0034] See also Figure 1-Figure 2 In other embodiments, two slots 11 are provided, symmetrically arranged on either side of the axis of the collector plate body 10. This allows the collector plate body 10 to be divided into a connecting portion 12 between the two slots 11 and a fixed portion 13 outside the two slots 11, enabling bending of the central portion of the collector plate body 10. Furthermore, the two slots 11 are arranged parallel to each other, facilitating machining of the two slots 11 and bending of the bent portion. Furthermore, multiple slots 11 can be provided. By providing multiple slots 11, the air conduction performance of the collector plate body 10 can be further enhanced. The number and arrangement of the slots 11 are determined based on factors such as the thickness, material, and cross-sectional area of ​​the collector plate body 10.

[0035] See also Figure 1-Figure 2 In other embodiments, an exhaust groove 14 is further provided on the collecting plate body 10. The exhaust groove 14 is located between the two cutting grooves 11, and the exhaust groove 14 is located below the explosion-proof valve 30. Through the large number of air-avoiding designs of the exhaust groove 14, effective air guidance can be achieved.

[0036] See also Figure 1-Figure 2 In other embodiments, the two fixing portions 13 are further provided with welding areas 15, through which the collector plate body 10 is welded. Furthermore, the fixing portions 13 are provided with a plurality of spaced through holes 18, allowing the electrolyte to flow through the through holes 18 to the winding core below the collector plate body 10.

[0037] See also Figure 1-Figure 2In other embodiments, a bending cut hole 16 is provided at the connection between the connecting portion 12 and the fixing portion 13, and the bending cut hole 16 is located on the groove 11, and the diameter of the bending cut hole 16 is greater than the width of the groove 11; by setting the two bending cut holes 16, the width of the connecting portion 12 at the bending cut holes 16 is narrowed, so that the connecting portion 12 can be bent more conveniently; further, two reinforcing ribs 17 are provided on the connecting portion 12, and the two reinforcing ribs 17 are arranged along the length direction of the groove 11, and the two reinforcing ribs 17 are located between the bending cut holes 16 and the head end of the connecting portion 12; so that when the connecting portion 12 is bent, the middle part of the connecting portion 12 can be effectively prevented from being deformed.

[0038] See also Figure 1-Figure 2 The present invention provides an embodiment of a cover structure, comprising: a substrate 20, an explosion-proof valve 30 installed on the substrate 20, and a collecting plate as any of the above embodiments installed below the substrate 20.

[0039] See also Figure 1-Figure 2 In other embodiments, an explosion-proof valve protective film 40 is provided on the side of the explosion-proof valve 30 away from the collecting disk, and the explosion-proof valve protective film 40 is installed on the substrate 20; in specific implementation, by attaching the explosion-proof valve protective film 40 to the side of the substrate 20 away from the collecting disk, a certain protection effect can be achieved for the explosion-proof valve 30.

[0040] See also Figure 1-Figure 2 Another embodiment of the present invention provides a cylindrical battery, comprising: a shell and a battery cover structure as any of the above embodiments installed on the shell.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A collecting plate, characterized in that: include: The collecting plate body is provided with a groove; one end of the groove passes through the collecting plate body to separate the collecting plate body into a connecting portion and a fixing portion; and the groove of the collecting plate body is used to deform when the pressure increases to increase the gap of the groove.

2. The collecting plate according to claim 1, characterized in that: There are two cutting grooves, which are symmetrically arranged on both sides of the axis of the collecting plate body.

3. The collecting plate according to claim 1, characterized in that: The collecting plate body is also provided with an exhaust groove, which is located below the explosion-proof valve.

4. The collecting plate according to claim 1, characterized in that: The collecting plate body is also provided with a welding area.

5. The collecting plate according to claim 1, characterized in that: A bending cut hole is provided at the connection point between the connecting portion and the fixing portion, and the bending cut hole is located on the cut groove.

6. The collecting plate according to claim 1, characterized in that: The connecting portion is provided with reinforcing ribs, which are arranged along the length direction of the slot.

7. The collecting plate according to claim 1, characterized in that: The collecting plate body is provided with a plurality of through holes arranged at intervals.

8. A cover plate structure, characterized in that: include: substrate; an explosion-proof valve, mounted on the substrate; and A current collecting plate according to any one of claims 1 to 7 is installed below the substrate.

9. The cover plate structure according to claim 8, characterized in that: An explosion-proof valve protection film is provided on a side of the explosion-proof valve away from the current collecting plate, and the explosion-proof valve protection film is installed on the base plate.

10. A cylindrical battery, characterized in that: include: case; and A battery cover structure according to any one of claims 8 to 9 mounted on the housing.

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