Explosion-proof valve for single battery, single battery and electric device

Abstract

The utility model relates to an explosion-proof valve for a single battery, the single battery and an electric device, the explosion-proof valve comprises a first base body part, a reinforcing structure and a nick which are sequentially arranged from outside to inside, and the first base body part is used for being welded with a mounting shell of the single battery; the reinforcing structure comprises a thinning part and a thickening part which are sequentially arranged from outside to inside, the thinning part is surrounded by the first base body part, the thinning part is arranged around the thickening part, and the thickening part is arranged around the nick; wherein the thickness of the thinning part is smaller than that of the first base body part, and the thickness of the thickening part is larger than that of the first base body part. According to the explosion-proof valve for the single battery, the reinforcing structure is additionally arranged, so that the influence of welding on the explosion value of the explosion-proof valve can be reduced, and the explosion value of the explosion-proof valve is ensured to be stable.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an explosion-proof valve for batteries, a single battery cell, and an electrical device. Background Technology

[0002] Under the dual pressures of energy crisis and environmental pollution, the electrification of automotive power systems is gradually becoming the mainstream of future automotive technology development. Lithium-ion batteries, due to their advantages in energy density and cycle life, are one of the main power sources for electric vehicles. However, safety incidents involving lithium-ion batteries occur occasionally, and the safety issues of lithium-ion batteries have become one of the major obstacles hindering the large-scale industrialization of electric vehicles.

[0003] As a safety device for batteries, the explosion-proof valve generates a large amount of gas when the battery malfunctions. The internal gas pressure of the battery causes the explosion-proof valve to burst open, thus releasing pressure. In actual use, the valve is only allowed to open when a specific gas pressure is reached. However, before reaching this specific opening pressure, excessive gas pressure can cause deformation at the welded positions of the explosion-proof valve. This deformation, in turn, causes the explosion-proof valve's burst value to become unstable, affecting the valve's opening stability and potentially leading to a safety accident. Utility Model Content

[0004] Based on the aforementioned deficiencies in the existing technology, the purpose of this utility model is to provide an explosion-proof valve for single-cell batteries. By adding thinning and thickening sections, the impact of welding on the explosion-proof valve's burst value can be reduced and the stability of the explosion-proof valve's burst value can be ensured.

[0005] Therefore, the present invention provides the following technical solution.

[0006] This utility model provides an explosion-proof valve for a single battery cell. The explosion-proof valve includes a first base portion, a reinforcing structure, and a groove arranged sequentially from the outside to the inside. The first base portion is used to weld to the mounting shell of the single battery cell. The reinforcing structure includes a thinning portion and a thickening portion arranged sequentially from the outside to the inside. The thinning portion is surrounded by the first base portion, the thinning portion is arranged around the thickening portion, and the thickening portion is arranged around the groove.

[0007] Wherein, the thickness of the thinned portion is less than the thickness of the first substrate portion, and the thickness of the thickened portion is greater than the thickness of the first substrate portion.

[0008] Optionally, the number of the reinforcing structures is at least two, and all the reinforcing structures are arranged sequentially from the outside to the inside.

[0009] Optionally, the explosion-proof valve further includes a second base portion, the thickness of which is equal to the thickness of the first base portion;

[0010] The reinforcing structure is disposed around the outside of the second base portion.

[0011] Optionally, the explosion-proof valve further includes a bursting part, with the second base part surrounding the outside of the bursting part, and the groove is provided on the bursting part; the thickness of the groove is less than the thickness of the bursting part and less than the thickness of the first base part.

[0012] Optionally, the thickness of the bursting portion is equal to the thickness of the thinning portion.

[0013] Optionally, one side of the explosion-proof valve has an uneven surface to form the first base portion, reinforcing structure, and grooves, while the opposite side surface is flush.

[0014] Optionally, the thickness of the first substrate portion is 0.1 mm ≤ 3 mm.

[0015] Optionally, the thickness of the thinned portion is 0.1 mm ≤ 2 mm, the thickness of the thickened portion is 0.1 mm < 4 mm, and the thickness of the groove is 0.01 mm ≤ 0.5 mm.

[0016] Optionally, 0.1mm < the thickness of the second base portion ≤ 3mm, and 0.1mm ≤ the thickness of the blasting portion ≤ 2mm.

[0017] This utility model also provides a single-cell battery, the single-cell battery comprising:

[0018] Explosion-proof valve for single-cell batteries as described above;

[0019] The mounting housing has a cavity;

[0020] The battery cell is placed inside the cavity.

[0021] Optionally, the explosion-proof valve is located outside the mounting housing, and the reinforcing structure and the groove are located on the side of the explosion-proof valve facing away from the outer wall of the mounting housing;

[0022] Alternatively, the explosion-proof valve is located inside the mounting housing, and the reinforcing structure and the groove are located on the side of the explosion-proof valve facing the inner wall of the mounting housing.

[0023] This utility model also provides an electrical device, which includes a single battery as described above.

[0024] The utility model has the following technical effects:

[0025] This invention provides an explosion-proof valve for single-cell batteries. By adding a thinning section, the impact of heat generated during welding on the stability of the scored area is reduced, i.e., the impact of welding on the burst value of the explosion-proof valve is reduced. By adding a thickening section, the area surrounded by the thickening section will not deform or will not easily deform when the explosion-proof valve deforms, ensuring the stability of the burst value of the explosion-proof valve, thereby ensuring the stability of valve opening and avoiding safety accidents. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the explosion-proof valve of this utility model;

[0027] Figure 2 This is a cross-sectional view of the explosion-proof valve of this utility model;

[0028] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0029] Figure 4 This is a cross-sectional view of the assembly structure of the explosion-proof valve and the top cover of this utility model;

[0030] Figure 5 for Figure 4 Enlarged view at point B in the middle;

[0031] Figure 6 This is an exploded view of the battery structure of this utility model.

[0032] Explanation of reference numerals in the attached figures

[0033] 100. Battery;

[0034] 1. Explosion-proof valve; 11. First base part; 12. Reinforcing structure; 121. Thinning part; 122. Thickening part; 13. Score; 14. Second base part; 15. Explosion part;

[0035] 2. Top cover; 21. Top cover piece; 211. First through hole; 22. Lower plastic; 221. Explosion-proof cavity; 222. Second through hole; 23. Positive terminal; 24. Negative terminal; 25. Sealing ring; 26. Upper plastic;

[0036] 3. Shell; 31. Cavity;

[0037] 4. Battery cell; 41. Positive electrode tab; 42. Negative electrode tab;

[0038] 5. Insulating components;

[0039] 6. First adapter plate;

[0040] 7. Second adapter plate. Detailed Implementation

[0041] To make the technical solution and beneficial effects of this utility model more apparent and understandable, a detailed description is provided below by listing specific embodiments. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0042] In the description of this utility model, unless otherwise expressly defined, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. That is, they should not be construed as limitations on this utility model.

[0043] In this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two; "several" means at least one; unless otherwise expressly defined.

[0044] In this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral molding; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also 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 according to the specific circumstances.

[0045] In this utility model, unless otherwise explicitly defined, the terms "above," "on top of," "above," "over," "below," "below," "below," or "below" for "first feature above second feature" can refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Furthermore, "above," "above," and "over" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0046] The following is based on Figures 1 to 6 This invention provides a detailed description of the single-cell battery.

[0047] In this embodiment, such as Figure 6 As shown, the single cell 100 includes an explosion-proof valve 1, a top cover 2, a housing 3, and a cell 4. The top cover 2 and the housing 3 together constitute the mounting shell of the single cell 100. The housing 3 has a cavity 31. The top cover 2 is used to close the opening of the housing 3. The top cover 2 and the housing 3 together enclose a cavity, and the cell 4 is placed in the cavity.

[0048] like Figures 1 to 3 As shown, the explosion-proof valve 1 includes a first base portion 11, a reinforcing structure 12, and a notch 13 arranged sequentially from the outside to the inside, as follows: Figures 4 to 6 As shown, the first base portion 11 can be welded to the top cover 2 of the outer casing so that the explosion-proof valve 1 can be assembled on the top cover 2; the first base portion 11 can also be welded to the housing 3 of the outer casing so that the explosion-proof valve 1 can be assembled on the housing 3. Figure 3 As shown, the reinforcing structure 12 includes a thinning portion 121 and a thickening portion 122 arranged sequentially from the outside to the inside. The thinning portion 121 is surrounded by the first base portion 11, and the thinning portion 121 surrounds the thickening portion 122. The thickening portion 122 surrounds the groove 13. The thickness of the thinning portion 121 is less than the thickness of the first base portion 11, and the thickness of the thickening portion 122 is greater than the thickness of the first base portion 11. The groove 13 is the thinnest part on the explosion-proof valve 1. When the internal gas pressure of the single battery 100 reaches a specific value, the explosion-proof valve 1 opens instantaneously from the groove 13 to release gas and prevent explosion.

[0049] In the above scheme, a thinning portion 121 is provided between the first base portion 11 and the notch 13. When the first base portion 11 is welded to the top cover 2 or the shell 3, since the thickness of the thinning portion 121 is less than the thickness of the first base portion 11, the thinning portion 121 can reduce the heat transferred from the first base portion 11 to the notch 13, thereby reducing the impact of the heat generated during welding on the stability of the notch 13, that is, reducing the impact of welding on the burst value of the explosion-proof valve 1. In addition, a thickening portion 122 is provided between the thinning portion 121 and the notch 13 to increase the strength of the explosion-proof valve 1. When the shell pressure of the single cell 100 rises, the thinning portion 121 deforms preferentially due to its thinness, releasing stress. The thickening portion 122 plays a reinforcing role, so that when the explosion-proof valve 1 deforms, the part surrounded by the thickening portion 122 will not deform or will not easily deform, ensuring the stability of the burst value of the explosion-proof valve 1, thereby ensuring the stability of valve opening and avoiding safety accidents.

[0050] In one embodiment, the explosion-proof valve 1 is manufactured by stamping. The configuration of the thinning part 121 and the thickening part 122 ensures that the processed material has a fixed flow direction. Specifically, during processing, the material of the thinning part 121 is stamped onto the thickening part 122, which reduces the forming difficulty of the thinning part 121 and lowers the processing cost.

[0051] In one embodiment, if Figures 4 to 6 As shown, since the top cover 2 has a small structure and is easy to process, welding the explosion-proof valve 1 to the top cover 2 helps to save costs.

[0052] In one embodiment, if Figure 1 and Figure 6 As shown, the first base portion 11 is annular. When the first base portion 11 is welded to the top cover 2 or the housing 3, it can be welded into a ring along the contour of the first base portion 11 to ensure the sealing between the two.

[0053] In one embodiment, the number of reinforcing structures 12 may be two, three or more, and all reinforcing structures 12 are arranged sequentially from the outside to the inside to further improve the stability of the explosion-proof valve 1.

[0054] In one embodiment, if Figures 1 to 3 As shown, the explosion-proof valve 1 also includes a second base portion 14, the thickness of which is equal to the thickness of the first base portion 11. A reinforcing structure 12 is disposed around the outside of the second base portion 14, and the second base portion 14 is disposed around a groove 13.

[0055] Furthermore, such as Figure 1 and Figure 3 As shown, the explosion-proof valve 1 also includes a bursting section 15, with a second base section 14 surrounding the outside of the bursting section 15, and a notch 13 provided on the bursting section 15; the thickness of the notch 13 is less than the thickness of the bursting section 15, which is less than the thickness of the first base section 11. The bursting section 15 can be circular or elliptical, and the notch 13 has a circular or elliptical annular structure. The shape of the notch 13 matches the shape of the bursting section 15 to ensure that stress can be concentrated at the notch 13 when the internal gas pressure of the single cell 100 increases. Furthermore, the thickness of the bursting section 15 is equal to the thickness of the thinning section 121.

[0056] In one embodiment, the thickness of the first base portion 11 is ≤3mm and ≤0.1mm.

[0057] In one embodiment, the thickness of the thinned portion 121 is ≤2mm and ≤0.1mm.

[0058] In one embodiment, the thickness of the thickened portion 122 is ≤4 mm and 0.1 mm <.

[0059] In one embodiment, 0.1mm < the thickness of the second base portion 14 ≤ 3mm, 0.1mm ≤ the thickness of the burst portion 15 ≤ 2mm, and 0.01mm ≤ the thickness of the notch 13 ≤ 0.5mm.

[0060] It should be understood that, in one specific embodiment, the thickness of the thinning portion 121 equals the thickness of the bursting portion 15, the thickness of the second base portion 14 equals the thickness of the first base portion 11, and the thickness of the notch 13 is less than the thickness of the bursting portion 15, less than the thickness of the first base portion 11, and less than the thickness of the thickening portion 122. There must be a thickness difference among these five portions. For example, the thicknesses of the first base portion 11 and the second base portion 14 are each 1.5 mm, the thicknesses of the thinning portion 121 and the bursting portion 15 are each 1 mm, the thickness of the thickening portion 122 is 2 mm, and the thickness of the notch 13 is 0.2 mm.

[0061] In one embodiment, if Figures 1 to 3 As shown, one side of the explosion-proof valve 1 has a concave-convex surface to form a first base portion 11, a reinforcing structure 12, a notch 13, a second base portion 14, and a burst portion 15. The opposite side of the explosion-proof valve 1 has a flat surface for easy processing.

[0062] In one embodiment, the explosion-proof valve 1 is located outside the housing. In this case, the outer wall of the housing serves as the mounting wall for installing the explosion-proof valve 1. The reinforcing structure 12 and the notch 13 are located on the side of the explosion-proof valve 1 facing the outer wall of the housing. During assembly, the uneven side of the explosion-proof valve 1 is first aligned with the mounting wall of the housing, and the two are then welded together. This helps to reduce the space occupied by the explosion-proof valve 1, making the structure more compact and saving space.

[0063] In another embodiment, the explosion-proof valve 1 is located inside the housing. In this case, the inner wall of the housing serves as the mounting surface of the explosion-proof valve 1. The reinforcing structure 12 and the notch 13 are located on the side of the explosion-proof valve 1 facing the inner wall of the housing. During assembly, the uneven side of the explosion-proof valve 1 is first aligned with the mounting surface of the housing, and then the two are welded together. This helps to reduce the space occupied by the housing 3, resulting in a more compact structure. In a specific embodiment, such as... Figure 5 As shown, the outer casing includes a top cover 2 and a housing 3. The top cover 2 is located above the housing 3. The explosion-proof valve 1 is located inside the top cover 2. The uneven side of the explosion-proof valve 1 faces upward and abuts against the mounting wall of the top cover 2.

[0064] In one embodiment, if Figure 4 and Figure 5As shown, the top cover 2 includes a lower plastic 22, which is connected to the bottom of the top cover piece 21. The lower plastic 22 has an interconnected explosion-proof cavity 221 and multiple second through holes 222. The explosion-proof valve 1 is located between the first through hole 211 of the top cover piece 21 and the explosion-proof cavity 221 of the lower plastic 22. The projected area of ​​the groove 13 on the cell 4 is less than or equal to the projected area of ​​the second through hole 222 on the cell 4. When the internal gas pressure of the single cell 100 increases, the gas inside the single cell 100 passes through the second through hole 222 and enters the explosion-proof cavity 221, squeezing the groove 13. When the internal gas pressure of the single cell 100 reaches a specific value, the explosion-proof valve 1 opens instantaneously from the groove 13.

[0065] In one embodiment, if Figure 4 and Figure 6 As shown, the top cover 2 also includes a positive terminal 23, a negative terminal 24, a sealing ring 25, and an upper plastic 26. The top cover plate 21 has two mounting holes (not shown in the figure), which are used to install the positive terminal 23 and the negative terminal 24 respectively. The assembly gap between the positive terminal 23 and the top cover plate 21 is sealed by the sealing ring 25, and the assembly gap between the negative terminal 24 and the top cover plate 21 is sealed by the sealing ring 25. The outer periphery of the positive terminal 23 and the negative terminal 24 is respectively covered with an insulating upper plastic 26.

[0066] In one embodiment, if Figure 4 and Figure 6 As shown, the single battery cell 100 also includes a first adapter 6 and a second adapter 7. The cell 4 is provided with a positive electrode tab 41 and a negative electrode tab 42. The first adapter 6 is used to electrically connect the positive electrode tab 41 to the positive terminal 23 so that the positive terminal 23 leads out the positive electrode. The second adapter 7 is used to electrically connect the negative electrode tab 42 to the negative terminal 24 so that the negative terminal 24 leads out the negative electrode.

[0067] In one embodiment, the single cell 100 further includes an insulating member 5, which is located in the mounting housing and sleeved on the outer periphery of the cell 4.

[0068] This utility model also provides an electrical device, which includes a single battery as described above.

[0069] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this utility model that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this utility model and do not limit the scope of protection of this utility model patent.

Claims

1. An explosion-proof valve for a single battery cell, characterized in that, The explosion-proof valve (1) includes a first base part (11), a reinforcing structure (12), and a notch (13) arranged sequentially from the outside to the inside. The first base part (11) is used to weld to the mounting shell of the single cell. The reinforcing structure (12) includes a thinning part (121) and a thickening part (122) arranged sequentially from the outside to the inside. The thinning part (121) is surrounded by the first base part (11), the thinning part (121) is arranged around the thickening part (122), and the thickening part (122) is arranged around the notch (13). The thickness of the thinned portion (121) is less than the thickness of the first substrate portion (11), and the thickness of the thickened portion (122) is greater than the thickness of the first substrate portion (11).

2. The explosion-proof valve for a single battery according to claim 1, characterized in that, The number of the reinforcing structures (12) is at least two, and all the reinforcing structures (12) are arranged sequentially from the outside to the inside.

3. The explosion-proof valve for a single battery according to claim 1, characterized in that, The explosion-proof valve (1) also includes a second base part (14), the thickness of which is equal to the thickness of the first base part (11); The reinforcing structure (12) is disposed around the outside of the second base portion (14).

4. The explosion-proof valve for a single battery according to claim 3, characterized in that, The explosion-proof valve (1) further includes a blasting part (15), and the second base part (14) is arranged around the outside of the blasting part (15). The groove (13) is provided on the blasting part (15); the thickness of the groove (13) is less than the thickness of the blasting part (15) and less than the thickness of the first base part (11).

5. The explosion-proof valve for a single battery according to claim 4, characterized in that, The thickness of the blasting part (15) is equal to the thickness of the thinning part (121).

6. The explosion-proof valve for a single battery cell according to claim 1, characterized in that, The explosion-proof valve (1) has a concave-convex surface on one side to form the first base part (11), the reinforcing structure (12) and the groove (13), and its opposite side surface is flush.

7. The explosion-proof valve for a single battery according to claim 1, characterized in that, 0.1mm≤thickness of the first base part (11)≤3mm.

8. The explosion-proof valve for a single battery according to claim 1, characterized in that, 0.1mm≤thickness of the thinned portion (121)≤2mm, 0.1mm<thickness of the thickened portion (122)≤4mm, 0.01mm≤thickness of the groove (13)≤0.5mm.

9. The explosion-proof valve for a single battery according to claim 4, characterized in that, 0.1mm < the thickness of the second base part (14) ≤ 3mm, 0.1mm ≤ the thickness of the blasting part (15) ≤ 2mm.

10. A single-cell battery, characterized in that, The single cell (100) includes: The explosion-proof valve (1) for a single battery as described in any one of claims 1-9; The mounting housing has a cavity; The battery cell (4) is placed inside the cavity.

11. The single-cell battery according to claim 10, characterized in that, The explosion-proof valve (1) is located outside the mounting housing, and the reinforcing structure (12) and the groove (13) are located on the side of the explosion-proof valve (1) facing the outer wall of the mounting housing; Alternatively, the explosion-proof valve (1) is located inside the mounting housing, and the reinforcing structure (12) and the groove (13) are located on the side of the explosion-proof valve (1) facing the inner wall of the mounting housing.

12. An electrical appliance, characterized in that, The electrical device includes a single battery as described in claim 10 or 11.

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