Explosion-proof valve, external protection assembly, and battery

Abstract

The utility model belongs to battery technical field discloses a kind of explosion-proof valve, external protection component and battery.The explosion-proof valve includes explosion-proof valve body and extension part, extension part is set along the outer edge of explosion-proof valve body, the outer side wall of extension part is connected to the inner side wall of explosion-proof through-hole, skirt is set on the one end of extension part close to the bottom port of explosion-proof through-hole, skirt is connected to the peripheral surface on the bottom port of explosion-proof through-hole.Because of the existence of seam bottom skirt, when explosion-proof valve is welded on external protection component, it can effectively avoid the problem that external protection component is welded through due to the thickness of external protection component is relatively thin, thereby effectively improve the welding yield and welding quality of explosion-proof valve, and further enhance the use safety of external protection component, so that the battery provided with the above external protection component not only has higher energy density, but also can improve battery production quality, stability and use safety.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an explosion-proof valve, an external protection component, and a battery. Background Technology

[0002] With the gradual development of science and technology, the safety of batteries, which are widely used in automobiles, energy storage devices, and electronic devices, is receiving increasing attention. To prevent battery explosions, explosion-proof valves (or safety valves) are generally installed on the battery cover.

[0003] Currently, the lightweight top cover plates or aluminum shells on the market are relatively thin. When welding explosion-proof valves using conventional methods, they are prone to burn-through, resulting in weld slag and explosion points on the inside of the top cover plate or aluminum shell. This greatly reduces the production yield and affects the safety of product use.

[0004] Therefore, it is necessary to design an explosion-proof valve, external protection components, and a battery to solve the problems existing in the current technology. Utility Model Content

[0005] One objective of this invention is to provide an explosion-proof valve that addresses the problem of low welding yield in explosion-proof valves, thereby improving welding quality and product safety.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] An explosion-proof valve is located inside an explosion-proof through-hole. The explosion-proof valve includes: an explosion-proof valve body; an extension portion disposed along the outer edge of the explosion-proof valve body, wherein the outer side wall of the extension portion is attached to the inner side wall of the explosion-proof through-hole, and a skirt is provided on one end of the extension portion near the bottom port of the explosion-proof through-hole, the skirt being attached to the peripheral surface of the bottom port of the explosion-proof through-hole.

[0008] Preferably, the skirt, the outer extension, and the explosion-proof valve body are integrally formed by stamping.

[0009] Preferably, the cross-sectional dimension of the skirt along the radial direction of the explosion-proof through hole is a, where 0.6 ≤ a ≤ 1 mm.

[0010] Preferably, along the axial direction of the explosion-proof through hole, the distance between the top surface of the skirt and the top surface of the explosion-proof valve is not greater than the length of the inner wall of the explosion-proof through hole.

[0011] Preferably, one of the skirt and the peripheral surface of the bottom port of the explosion-proof through hole is provided with an annular groove around the axis of the explosion-proof through hole, and the other is provided with an annular protrusion. When the explosion-proof valve is installed in the explosion-proof through hole, the annular protrusion is inserted into the annular groove for limiting.

[0012] Preferably, the extension portion is interference-fitted to the explosion-proof through hole.

[0013] Preferably, the extension includes a first step and a second step, with the second step disposed between the first step and the explosion-proof valve body. The first step is provided with the skirt. Along the axial direction of the explosion-proof through hole, the top surface of the first step is higher than the top surface of the second step, and the top surface of the second step is higher than the top surface of the explosion-proof valve body.

[0014] Preferably, there is a stepped surface between the first step and the second step, and the stepped surface is gradually inclined toward the axis of the explosion-proof through hole along the direction from the first step vertically to the second step.

[0015] The external protection component includes a housing, a cover assembly, and the aforementioned explosion-proof valve, wherein the housing and / or the cover assembly are provided with explosion-proof through holes for installing the explosion-proof valve.

[0016] The battery includes a cell body and the aforementioned external protection assembly, the external protection assembly having a receiving cavity in which the cell body is housed.

[0017] The beneficial effects of this utility model are as follows:

[0018] This utility model provides an explosion-proof valve, an external protection component, and a battery. The external protection component of the battery is equipped with the improved explosion-proof valve of this utility model. The explosion-proof valve includes a valve body and an extension portion. A skirt is provided at one end of the extension portion near the bottom port of the explosion-proof through-hole, and the skirt is fitted to the peripheral surface of the bottom port of the explosion-proof through-hole. When the explosion-proof valve is welded to the external protection component, the welding torch can weld the explosion-proof valve to the external protection component along the weld seam between the extension portion and the explosion-proof through-hole. Furthermore, because of the skirt at the bottom of the weld seam, problems such as weld penetration of the external protection component due to its thinness can be effectively avoided, thereby effectively improving the welding yield and welding quality of the explosion-proof valve, and thus enhancing the safety of the external protection component. When this external protection component is installed on the battery, it not only has a higher energy density but also improves the battery's production quality, stability, and safety in use. Attached Figure Description

[0019] Figure 1 This is a top view of the cover plate assembly provided in this embodiment of the utility model;

[0020] Figure 2 It is along Figure 1 Sectional view at point AA;

[0021] Figure 3 yes Figure 2 A magnified view of a section at point B in the middle;

[0022] Figure 4 This is a schematic diagram of the battery structure provided by this utility model.

[0023] In the picture:

[0024] 1. Outer shell; 2. Cover plate assembly; 3. Top cover plate; 31. Explosion-proof through hole; 4. Explosion-proof valve; 41. Explosion-proof valve body; 42. Extension; 421. First step; 422. Second step; 423. Step surface; 43. Skirt. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0029] The battery, external protection component, and explosion-proof valve disclosed in this utility model will be explained in detail below with reference to the accompanying drawings and specific embodiments.

[0030] This embodiment discloses a battery, which includes an external protection component and a cell body. The external protection component has a receiving cavity, and the cell body is installed in the receiving cavity. The battery in this embodiment can be a lithium-ion battery, or a nickel battery, lead-acid battery, or other types of batteries, and this application is not limited to this. The cell body is composed of a positive electrode film, a separator, and a negative electrode film wound or stacked. The external protection component includes an outer shell 1 and a cover plate assembly 2. The cover plate assembly 2 includes a top cover plate 3 and an explosion-proof valve 4. The top cover plate 3 has an explosion-proof through hole 31 for installing the explosion-proof valve 4. In addition, a positive electrode assembly (not shown in the figure) and a negative electrode assembly (not shown in the figure) of opposite polarities are also insulatedly installed on the top cover plate 3. The positive electrode assembly is electrically connected to the positive electrode film of the cell body, and the negative electrode assembly is electrically connected to the negative electrode film of the cell body. In addition, in some embodiments, a liquid injection hole (not shown in the figure) and a sealing pin for sealing the liquid injection hole are also provided on the top cover plate 3.

[0031] Since this embodiment does not improve the structure other than the explosion-proof valve 4 on the cover plate assembly 2, the structure of the explosion-proof valve 4 will be explained in detail below.

[0032] like Figure 2 , Figure 3 As shown, the explosion-proof valve 4 provided in this embodiment includes an explosion-proof valve body 41 and an extension portion 42. The extension portion 42 is annular and is disposed along the outer edge of the explosion-proof valve body 41. When the explosion-proof valve 4 is installed on the explosion-proof through hole 31, the outer side wall of the extension portion 42 will be attached to the inner side wall of the explosion-proof through hole 31. Furthermore, a skirt 43 is provided at one end of the extension portion 42 near the bottom port of the explosion-proof through hole 31, and the skirt 43 can be attached to the peripheral surface of the bottom port of the explosion-proof through hole 31. In this embodiment, the explosion-proof through hole 31 is formed on the top cover plate 3; therefore, the explosion-proof valve 4 in this embodiment is disposed on the top cover plate 3, and the skirt 43 is attached to the bottom surface of the top cover plate 3. When welding the explosion-proof valve 4 onto the top cover plate 3, the welding torch can weld the explosion-proof valve 4 onto the top cover plate 3 along the weld between the outer extension 42 and the explosion-proof through hole 31. Furthermore, since there is a skirt 43 at the bottom of the weld, it can effectively avoid problems such as the cover plate assembly 2 being welded through when the thickness of the top cover plate 3 is too thin. This effectively improves the welding yield and welding quality of the explosion-proof valve 4, thereby enhancing the safety of the cover plate assembly 2 in use.

[0033] Of course, conversely, in some other parallel embodiments, when the outer casing 1 of the battery is provided with an explosion-proof through hole 31, the explosion-proof valve 4 can also be provided on the outer casing 1; in some other parallel embodiments, when both the outer casing 1 of the battery and the top cover 3 are provided with explosion-proof through holes 31, an explosion-proof valve 4 can be provided on both the outer casing 1 and the cover assembly 2 to adapt to the safety requirements of different types of batteries.

[0034] refer to Figure 3 As shown, in this embodiment, the cross-sectional dimension of the skirt 43 along the radial direction of the explosion-proof through hole 31 is set as 'a', where 'a' satisfies: 0.6 ≤ a ≤ 1 mm. For example, the value of 'a' can be 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm, etc. It should be noted that when 'a' is less than 0.6 mm, the radial dimension of the skirt 43 will be too short. An excessively short skirt 43 may still pose a risk of weld penetration or incomplete welding during the welding process, leading to a decrease in welding quality. When 'a' is greater than 1 mm, it will increase the amount of material used in the skirt 43, resulting in increased costs. By controlling 'a' within the range of 0.6-1 mm, the explosion-proof valve 4 provided in this embodiment can leverage its production advantages of cost control and enhanced welding quality in most battery products.

[0035] Furthermore, in this embodiment, along the axial direction of the explosion-proof through hole 31, the distance between the top surface of the skirt 43 and the top surface of the explosion-proof valve 4 is not greater than the length of the inner wall of the explosion-proof through hole 31. This ensures that when the explosion-proof valve 4 is inserted into the explosion-proof through hole 31 from bottom to top, and the skirt 43 abuts against the bottom surface of the top cover plate 3, the top surface of the explosion-proof valve 4 can be lower than the top surface of the top cover plate 3. This avoids the situation where the explosion-proof valve 4 protrudes from the top cover plate 3, causing an increase in the thickness of the cover assembly 2. This reduces the volume ratio of the cover assembly 2 in the entire battery, thereby helping to improve the energy density of the battery and enhance its durability and performance.

[0036] Furthermore, the skirt 43, the extension 42, and the explosion-proof valve body 41 can be integrally formed by stamping, which reduces manufacturing costs and helps improve the structural stability and durability of the explosion-proof valve 4 during use, as well as its pressure resistance and shock resistance.

[0037] It should be further noted that in some parallel embodiments, one of the peripheral surfaces of the skirt 43 and the bottom port of the explosion-proof through hole 31 is provided with an annular groove around the axis of the explosion-proof through hole 31, and the other is provided with an annular protrusion at the corresponding position. When the explosion-proof valve 4 is installed in the explosion-proof through hole 31, the annular protrusion can be inserted into the annular groove for limiting the explosion-proof valve 4 and the top cover plate 3 in the horizontal direction through the annular groove and the annular protrusion. This not only improves the positioning and guiding effect of the explosion-proof valve 4 during installation, making the assembly position of the explosion-proof valve 4 more accurate, but also helps to enhance the stability of the explosion-proof valve 4 during the welding process, preventing it from shifting or shaking, thereby improving the welding quality. It can be understood that when the skirt 43 is provided with an annular protrusion, the bottom of the top cover plate 3 is provided with an annular groove, and vice versa.

[0038] Optionally, in this embodiment, the extension portion 42 is interference-fitted to the explosion-proof through hole 31, which can further improve the installation stability of the explosion-proof valve 4 in the explosion-proof through hole 31, and can limit the explosion-proof valve 4 to a certain extent in both the horizontal and vertical directions, thereby further enhancing the welding yield and welding quality of the explosion-proof valve 4 and the top cover plate 3.

[0039] Optionally, the extension portion 42 includes a first step 421 and a second step 422. The second step 422 is provided between the first step 421 and the explosion-proof valve body 41. The outer edge of the first step 421 is provided with the aforementioned skirt 43. Along the axial direction of the explosion-proof through hole 31 (i.e., along the vertical direction), the top surface of the first step 421 is higher than the top surface of the second step 422, and the top surface of the second step 422 is higher than the top surface of the explosion-proof valve body 41, so that the explosion-proof valve 4 is concave in shape. That is, the explosion-proof valve body 41 is located closer to the battery cell body. When the battery cell body experiences thermal runaway, the explosion-proof valve body 41 can respond more quickly. The grooves on the explosion-proof valve body 41 open, and the explosion-proof through hole 31 connects with the external environment, allowing the gas generated by the battery thermal runaway to quickly leak out through the explosion-proof through hole 31, thereby further reducing the possibility of battery explosion.

[0040] Optionally, in this embodiment, a stepped surface 423 is provided between the first step 421 and the second step 422, and along the direction from the first step 421 vertically to the second step 422, the stepped surface 423 is gradually inclined toward the axis of the explosion-proof through hole 31. By providing the inclined stepped surface 423, it helps to improve the stamping efficiency of the first step 421 and the second step 422. Moreover, when the explosion-proof valve 4 is welded to the top cover plate 3, the stepped surface 423 can effectively absorb and disperse the stress generated during the welding process, preventing excessive local stress from causing damage or deformation of the explosion-proof valve 4, thereby helping to improve the safety and reliability of the explosion-proof valve 4.

[0041] This embodiment also provides an external protection component, including a housing 1, a cover assembly 2, and the aforementioned explosion-proof valve 4. The housing 1 and / or the cover assembly 2 are provided with explosion-proof through holes 31 for installing the explosion-proof valve 4, allowing the explosion-proof valve 4 to be installed at different locations on the battery according to actual operating conditions. By providing the explosion-proof valve 4 on the external protection component, since the explosion-proof valve 4 has a skirt 43 on its outer extension 42, and the skirt 43 fits against the peripheral surface of the bottom port of the explosion-proof through hole 31, when the explosion-proof valve 4 is welded into the explosion-proof through hole 31, the skirt 43 effectively increases the thickness of the welding area. This effectively avoids the risk of weld penetration when the cover assembly 2 or the housing 1 is thin, thereby ensuring welding quality and improving the safety of the external protection component.

[0042] In the battery disclosed in this embodiment, the outer casing 1 of the external protection component has a receiving cavity, in which the battery cell is housed. Finally, the opening of the receiving cavity is sealed by the cover assembly 2 to insulate the battery cell from the external environment. Because this battery is equipped with the aforementioned external protection component, it ensures high energy density while improving battery production quality, stability, and safety in use.

[0043] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An explosion-proof valve, located within an explosion-proof through-hole (31), characterized in that, The explosion-proof valve (4) includes: Explosion-proof valve body (41); An extension portion (42) is provided along the outer edge of the explosion-proof valve body (41), and the outer side wall of the extension portion (42) is attached to the inner side wall of the explosion-proof through hole (31). A skirt (43) is provided on one end of the extension portion (42) near the bottom port of the explosion-proof through hole (31), and the skirt (43) is attached to the peripheral surface of the bottom port of the explosion-proof through hole (31).

2. The explosion-proof valve according to claim 1, characterized in that, The skirt (43), the extension (42), and the explosion-proof valve body (41) are integrally formed by stamping.

3. The explosion-proof valve according to claim 1, characterized in that, The cross-sectional dimension of the skirt (43) along the radial direction of the explosion-proof through hole (31) is a, 0.6≤a≤1mm.

4. The explosion-proof valve according to claim 1, characterized in that, Along the axial direction of the explosion-proof through hole (31), the distance between the top surface of the skirt (43) and the top surface of the explosion-proof valve (4) is not greater than the length of the inner wall of the explosion-proof through hole (31).

5. The explosion-proof valve according to claim 1, characterized in that, Of the two peripheral surfaces of the skirt (43) and the bottom port of the explosion-proof through hole (31), one is provided with an annular groove around the axis of the explosion-proof through hole (31), and the other is provided with an annular protrusion. When the explosion-proof valve (4) is placed in the explosion-proof through hole (31), the annular protrusion is inserted into the annular groove for limiting.

6. The explosion-proof valve according to any one of claims 1-5, characterized in that, The extension portion (42) is interference-fitted to the explosion-proof through hole (31).

7. The explosion-proof valve according to any one of claims 1-5, characterized in that, The extension portion (42) includes a first step (421) and a second step (422). The second step (422) is provided between the first step (421) and the explosion-proof valve body (41). The skirt (43) is provided on the first step (421). Along the axial direction of the explosion-proof through hole (31), the top surface of the first step (421) is higher than the top surface of the second step (422), and the top surface of the second step (422) is higher than the top surface of the explosion-proof valve body (41).

8. The explosion-proof valve according to claim 7, characterized in that, There is a step surface (423) between the first step (421) and the second step (422). Along the direction from the first step (421) vertically to the second step (422), the step surface (423) is gradually inclined toward the axis of the explosion-proof through hole (31).

9. An external protection component, characterized in that, The device includes a housing (1), a cover plate assembly (2), and an explosion-proof valve (4) according to any one of claims 1-8, wherein the housing (1) and / or the cover plate assembly (2) are provided with explosion-proof through holes (31) for installing the explosion-proof valve (4).

10. A battery, characterized in that, It includes a battery cell body and an external protection component as described in claim 9, the external protection component having a receiving cavity in which the battery cell body is housed.

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