Anti-explosion valve of battery and battery
By optimizing the grooved structure of the explosion-proof valve, the problem of abnormal valve opening was solved, achieving stable pressure relief and improved safety of the battery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CALB GROUP CO LTD
- Filing Date
- 2025-05-08
- Publication Date
- 2026-04-21
AI Technical Summary
The explosion-proof valves of existing batteries are prone to abnormal opening, failing to perform their pressure relief function properly.
The design of the scoring structure of the explosion-proof valve is such that the width of the second segment does not exceed the width of the first segment, and the width change rate of the second segment is greater than that of the first segment. This reduces the probability of material movement along the thickness direction, avoids material accumulation at the residual thickness of the scoring, and ensures stable pressure relief of the explosion-proof valve.
This effectively prevents abnormal opening of the explosion-proof valve, ensuring that the explosion-proof valve of the battery can stably perform its pressure relief function, thereby improving battery safety and production efficiency.
Smart Images
Figure CN224153540U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, specifically to an explosion-proof valve for batteries and batteries. Background Technology
[0002] Batteries are typically encapsulated in a metal casing. To ensure battery safety, a pressure relief vent is usually provided on the metal casing, and an explosion-proof valve is welded to the vent. This allows for the release of internal pressure when the battery is under high pressure, preventing accidents such as explosions. In existing technology, the explosion-proof valve has stamped grooves to thin the remaining thickness of the grooves. However, this thinning process can easily lead to abnormal valve opening, preventing the explosion-proof valve from functioning properly as a pressure relief device. Utility Model Content
[0003] In view of this, the present invention provides an explosion-proof valve for a battery and a battery, in order to solve the problem that the existing explosion-proof valves for batteries are prone to abnormal opening and cannot perform their pressure relief function properly.
[0004] In a first aspect, this utility model provides an explosion-proof valve for a battery, comprising: a body having a first surface and a second surface disposed opposite to each other along the thickness direction, wherein the body is recessed from the first surface to the second surface to form a groove, the groove comprising a first segment and a second segment connected along the thickness direction, and in a direction perpendicular to the thickness direction, the width of the second segment does not exceed the width of the first segment, the width change rate of the first segment is i, the width change rate of the second segment is j, and i < j.
[0005] Beneficial effects: By making the second segment smaller and the width change rate larger than that of the first segment, when stamping the score on the main body, the material of the main body can move towards both sides in the width direction, reducing the probability of material moving along the thickness direction. This reduces the accumulation of material at the residual thickness of the score, avoids excessive brittleness at the residual thickness of the score, and thus prevents abnormal opening of the battery's explosion-proof valve, ensuring that the battery's explosion-proof valve can stably perform its pressure relief function.
[0006] Secondly, this utility model also provides a battery, comprising: a casing with an opening at at least one end; a cover plate connected to the casing and sealing the opening, the casing and the cover plate forming an accommodating space; an explosion-proof valve for the battery, wherein the casing and / or the cover plate have a pressure relief port, the pressure relief port is connected to the accommodating space, and the explosion-proof valve of the battery covers the pressure relief port; and a battery cell disposed within the accommodating space. Attached Figure Description
[0007] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0008] Figure 1 This is a schematic diagram of the overall structure of an explosion-proof valve for a battery according to an embodiment of the present utility model;
[0009] Figure 2 for Figure 1 A top view of the explosion-proof valve of the battery shown;
[0010] Figure 3 for Figure 2 A cross-sectional view along the AA direction;
[0011] Figure 4 for Figure 3 A magnified view of a portion of point B in the middle;
[0012] Figure 5 for Figure 3 Another enlarged view of a section at point B;
[0013] Figure 6 for Figure 3 Another magnified view of point B in the middle;
[0014] Figure 7 This is a schematic diagram of the overall structure of a battery according to an embodiment of the present utility model.
[0015] Explanation of reference numerals in the attached figures:
[0016] 1. Main body; 11. First surface; 12. Second surface; 2. Scratches; 21. First segment; 211. Third sidewall; 212. Fourth sidewall; 22. Second segment; 221. First sidewall; 222. Second sidewall; 3. Shell; 4. Cover plate. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0018] The following is combined Figures 1 to 7The following describes embodiments of the present invention.
[0019] According to an embodiment of the present invention, in one aspect, an explosion-proof valve for a battery is provided, comprising: a body 1 having a first surface 11 and a second surface 12 disposed opposite to each other along the thickness direction, the body 1 having a groove 2 formed by recessing from the first surface 11 to the second surface 12, the groove 2 including a first segment 21 and a second segment 22 connected along the thickness direction, and in the direction perpendicular to the thickness direction, the width of the second segment 22 not exceeding the width of the first segment 21, the width change rate of the first segment 21 being i, and the width change rate of the second segment 22 being j, satisfying i < j.
[0020] The explosion-proof valve of this embodiment, by making the second segment 22 have a smaller width and a larger width change rate compared to the first segment 21, allows the material of the main body 1 to move towards both sides in the width direction when the notch 2 is stamped on the main body 1. This reduces the probability of material moving along the thickness direction, thereby reducing the accumulation of material at the residual thickness of the notch 2 and preventing excessive brittleness at the residual thickness of the notch 2. This avoids abnormal opening of the explosion-proof valve and ensures that the explosion-proof valve can stably perform its pressure relief function.
[0021] It is worth noting that the two serrations on the explosion-proof valve are the weak points of the valve, which are the locations where the valve is most likely to burst. These are usually the areas with the thinnest thickness and are generally formed by laser etching or stamping on the explosion-proof valve substrate.
[0022] It should be noted that the width change rate refers to the degree of change in the width of the first segment 21 and the second segment 22 along the thickness direction from the first surface 11 to the second surface 12 in a cross-section along the thickness direction. That is, the greater the width change rate, the greater the decrease in width along the thickness direction from the first surface 11 to the second surface 12; the smaller the width change rate, the smaller the decrease in width along the thickness direction from the first surface 11 to the second surface 12.
[0023] For example, please refer to Figure 4 At any cross-section along the thickness direction, the cross-sectional shape of the first segment 21 is square, and the cross-sectional shape of the second segment 22 is an isosceles trapezoid. For the first segment 21, its width remains constant along the thickness direction from the first surface 11 to the second surface 12; therefore, the width change rate i of the first segment 21 is 0. For the second segment 22, its width gradually decreases along the thickness direction from the first surface 11 to the second surface 12; therefore, the width change rate j of the second segment 22 is greater than 0. Therefore, the values of i and j satisfy i < j.
[0024] Of course, for other alternative implementations, please refer to [link / reference]. Figure 6In the cross-section along the thickness direction, the cross-sectional shape of the first segment 21 can also be trapezoidal, and the width of the first segment 21 gradually decreases along the thickness direction from the first surface 11 to the second surface 12. Furthermore, in the cross-section along the thickness direction, the trapezoidal cross-sectional shape of the first segment 21 and / or the second segment 22 can be a non-isosceles trapezoid.
[0025] It should be noted that you should refer to [link / reference]. Figure 6 In the circumferential direction of the first segment 21, there is any one sidewall, and the rate of change of the width of the first segment 21 on this sidewall is i = Δx1 / h1; in the circumferential direction of the second segment 22, there is any one sidewall, and the rate of change of the width of the second segment 22 on this sidewall is j = Δx2 / h2. From i < j, we can conclude that (Δx1 / h1) < (Δx2 / h2).
[0026] It is worth noting that in related technologies, the notch 2 is usually square or trapezoidal in cross-section along the thickness direction. Therefore, when the notch 2 is stamped on the main body 1, a large amount of material from the main body 1 moves along the thickness direction, causing material to accumulate at the remaining thickness of the notch 2. This results in greater brittleness at the remaining thickness of the notch 2, which can easily cause abnormal opening of the explosion-proof valve and affect its pressure relief function. Furthermore, in order for the explosion-proof valve to only open when the battery reaches the preset burst pressure, the remaining thickness of the notch 2 needs to be larger, resulting in a larger overall thickness of the explosion-proof valve. This leads to increased production costs, increased weight of the explosion-proof valve, and increased space occupation, affecting the lightweight design of the battery and the improvement of the battery's energy density.
[0027] In this embodiment, for the notch 2, the width of the second segment 22 is not greater than the width of the first segment 21, and the width change rate of the second segment 22 is greater than the width change rate of the first segment 21. Thus, when the notch 2 is stamped on the main body 1, the material of the main body 1 can move towards both sides in the width direction with a high probability, reducing the accumulation of material at the remaining thickness of the notch 2, ensuring the structural performance of the remaining thickness of the notch 2, and ensuring the pressure relief function of the explosion-proof valve.
[0028] It should be noted that abnormal opening of the explosion-proof valve is relative to its normal opening. Normal opening refers to a situation where, due to thermal runaway or other issues, excessive gas is generated inside the battery, leading to excessive internal pressure. This excessive pressure forces the explosion-proof valve to open at the remaining thickness of the groove (mark 2), releasing internal pressure and preventing battery explosion. Abnormal opening, however, occurs when the internal battery pressure remains within the normal range and would not normally cause the groove to open. Yet, under external forces, such as pressure or impact, the valve may crack at the remaining thickness of the groove, causing it to burst open.
[0029] It is worth noting that, please refer to Figure 4 On the cross-section along the thickness direction, the direction perpendicular to the thickness direction is the width direction of the notch 2.
[0030] It should be noted that you should refer to [link / reference]. Figure 4 The first segment 21 is positioned close to the first surface 11, and the second segment 22 is positioned close to the second surface 12.
[0031] In one embodiment, the width change rate i of the first segment 21 satisfies 0 ≤ i ≤ 0.3; the width change rate j of the second segment 22 satisfies 0.4 ≤ j ≤ 2. By limiting the width change rate of the first segment 21, the stamping forming of the notch 2 is facilitated, and the stamping efficiency is improved; by limiting the width change rate of the second segment 22, the structural performance of the explosion-proof valve at the residual thickness of the notch 2 is guaranteed, thereby ensuring the pressure relief function of the explosion-proof valve.
[0032] It is worth noting that the minimum value of the width change rate i of the first segment 21 is 0. If the width change rate i of the first segment 21 is too large, the width change rate of the second segment 22 will be even larger, which will make it difficult to stamp the notch 2 and reduce the processing efficiency of the explosion-proof valve.
[0033] It is worth noting that if the width change rate j of the second segment 22 is too small, the probability of material moving along the thickness direction will still be relatively high, which will not be enough to prevent the residual thickness of the notch 2 from being too brittle, and there will still be a risk of abnormal opening of the explosion-proof valve. If the width change rate j of the second segment 22 is too large, it will result in too little material accumulation below the notch 2, low strength at the residual thickness of the notch 2, and a small area of the explosion-proof valve at the lower end of the notch 2 (the end near the second surface 12), making it difficult for the explosion-proof valve to burst open and affecting the pressure relief performance of the explosion-proof valve.
[0034] Optionally, the value of i can be any one of 0, 0.02, 0.05, 0.07, 0.1, 0.12, 0.15, 0.17, 0.2, 0.22, 0.25, 0.27, 0.3 or a value between any two values.
[0035] Optionally, j can take any value from 0.4, 0.43, 0.45, 0.48, 0.5, 0.53, 0.55, 0.58, 0.6, 0.63, 0.65, 0.68, 0.7, 0.73, 0.75, 0.78, 0.8, 0.83, 0.85, 0.88, 0.9, 0.93, 0.95, 0.98, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.73, 2, or a value between any two values.
[0036] In one embodiment, such as Figure 4 As shown, in the cross-section along the thickness direction, in the direction perpendicular to the thickness direction, the width of the second segment 22 near the first surface 11 is a1, and the width of the second segment 22 near the second surface 12 is a2, satisfying 0.03≤a2 / a1<1. This setting ensures the structural performance of the explosion-proof valve at the residual thickness of the notch 2, thereby ensuring the pressure relief function of the explosion-proof valve.
[0037] It is worth noting that if the value of a2 / a1 is too large, the probability of material moving along the thickness direction will still be relatively high, which will not be enough to prevent the residual thickness of the notch 2 from being too brittle, and there will still be a risk of abnormal opening of the explosion-proof valve. If the value of a2 / a1 is too small, there will be too little material accumulation below the notch 2, the strength of the residual thickness of the notch 2 will be low, and the area of the explosion-proof valve at the lower end of the notch 2 (the end near the second surface 12) will be small, making it difficult for the explosion-proof valve to burst open and affecting the pressure relief performance of the explosion-proof valve. If it is to ensure that the explosion-proof valve has sufficient area at the lower end of the notch 2 (the end near the second surface 12), the width of each part of the second segment 22 will be increased, resulting in the notch 2 being too wide and affecting the overall strength performance of the explosion-proof valve.
[0038] Optionally, the value of a2 / a1 can be any one of the following: 0.03, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 0.99, or a value between any two of these values.
[0039] Furthermore, in one embodiment, the width a1 of the second segment 22 near the first surface 11 satisfies 0.1mm ≤ a1 ≤ 2mm, and the width a2 of the second segment 22 near the second surface 12 satisfies 0.05mm ≤ a2 ≤ 1.5mm. This configuration ensures the structural performance of the explosion-proof valve at the residual thickness of the notch 2, thereby guaranteeing the pressure relief function of the explosion-proof valve.
[0040] It is worth noting that if a1 > 2mm, the overall width of the notch 2 is too large, resulting in poor structural strength of the explosion-proof valve; if a1 < 0.1mm, the overall width of the notch 2 is too small, making it difficult for the explosion-proof valve to burst open, thus affecting the pressure relief performance of the explosion-proof valve.
[0041] Optionally, the value of a1 can be any value from 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, 1.55mm, 1.6mm, 1.65mm, 1.7mm, 1.75mm, 1.8mm, 1.85mm, 1.9mm, 1.95mm, 2mm, or a value between any two values.
[0042] It is worth noting that if a2 > 1.5 mm, the probability of material moving along the thickness direction will still be relatively high, which will not be enough to prevent the residual thickness of the notch 2 from being too brittle, and there will still be a risk of abnormal opening of the explosion-proof valve. If the goal is to reduce the probability of material moving along the thickness direction, the width of each part of the second segment 22 will be increased, resulting in an excessively large width of the notch 2, which will affect the overall strength performance of the explosion-proof valve. If a2 < 0.05 mm, there will be too little material accumulation below the notch 2, the strength of the residual thickness of the notch 2 will be low, and the area of the explosion-proof valve at the lower end of the notch 2 (the end near the second surface 12) will be small, making it difficult for the explosion-proof valve to burst open, which will affect the pressure relief performance of the explosion-proof valve.
[0043] Optionally, the value of a2 can be any value from 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, and 1.5mm, or a value between any two values.
[0044] In one embodiment, such as Figure 4 As shown, in the cross-section along the thickness direction, the depth of the first segment 21 is h1, and the depth of the second segment 22 is h2, satisfying h1≤h2. This allows the second segment 22 to have a larger depth, facilitating the satisfaction of the width variation rate of the second segment 22, thus ensuring the structural performance of the explosion-proof valve at the residual thickness of the notch 2, and consequently guaranteeing the pressure relief function of the explosion-proof valve.
[0045] Furthermore, in one embodiment, the depth h1 of the first segment 21 and the depth h2 of the second segment 22 satisfy 0.3 ≤ h1 / h2 ≤ 1. This setting ensures the structural performance of the explosion-proof valve at the residual thickness of the notch 2, thereby ensuring the pressure relief function of the explosion-proof valve.
[0046] It is worth noting that if h1 / h2 > 1, the depth of the second segment 22 is too small, which is not conducive to meeting the width change rate of the second segment 22, that is, it is not conducive to the processing and forming of the notch 2. If h1 / h2 < 0.3, when the width change rate of the second segment 22 is constant, the area of the explosion-proof valve at the lower end of the notch 2 (the end closer to the second surface 12) is small, making it difficult for the explosion-proof valve to burst open, affecting the pressure relief performance of the explosion-proof valve. If it is to ensure that the explosion-proof valve has sufficient area at the lower end of the notch 2 (the end closer to the second surface 12), the width of the second segment 22 at all points will be increased, resulting in the notch 2 being too wide, which affects the overall strength performance of the explosion-proof valve.
[0047] Specifically, the depth h1 of the first segment 21 satisfies 0.1mm≤h1≤0.35mm, and the depth h2 of the second segment 22 satisfies 0.16mm≤h2≤0.4mm.
[0048] It is worth noting that if h1 < 0.1 mm, the depth of the first segment 21 is too small, making it difficult to process and shape, and easily leading to an excessively large depth of the second segment 22. In this case, when the width variation rate of the second segment 22 is constant, the area of the explosion-proof valve at the lower end of the notch 2 (the end closest to the second surface 12) is small, making it difficult for the explosion-proof valve to burst open, affecting its pressure relief performance. However, if the goal is to ensure sufficient area at the lower end of the notch 2 (the end closest to the second surface 12), the width of the second segment 22 at all points will increase, resulting in an excessively large width of the notch 2, affecting the overall strength performance of the explosion-proof valve. If h1 > 0.35 mm, the depth of the first segment 21 is too large, easily causing the depth of the second segment 22 to be too small, making it difficult to meet the width variation rate of the second segment 22, i.e., making it difficult to process and shape the notch 2.
[0049] Optionally, h1 can be any value from 0.1mm, 0.12mm, 0.15mm, 0.18mm, 0.2mm, 0.22mm, 0.25mm, 0.28mm, 0.3mm, 0.32mm, 0.35mm, or a value between any two of these values.
[0050] It is worth noting that if h2 < 0.16 mm, the depth of the second segment 22 is too small, which is not conducive to meeting the width change rate of the second segment 22, that is, it is not conducive to the processing and forming of the notch 2; if h2 > 0.4 mm, the depth of the second segment 22 is too large. When the width change rate of the second segment 22 is constant, the area of the explosion-proof valve at the lower end of the notch 2 (the end near the second surface 12) is small, making it difficult for the explosion-proof valve to burst open, affecting the pressure relief performance of the explosion-proof valve. If it is to ensure that the explosion-proof valve has sufficient area at the lower end of the notch 2 (the end near the second surface 12), the width of the second segment 22 at all points will be increased, resulting in the notch 2 being too wide, which affects the overall strength performance of the explosion-proof valve.
[0051] Optionally, h2 can be any value from 0.16mm, 0.18mm, 0.2mm, 0.22mm, 0.25mm, 0.28mm, 0.3mm, 0.32mm, 0.35mm, 0.38mm, 0.4mm, or a value between any two values.
[0052] In one embodiment, such as Figure 4 As shown, in the cross-section along the thickness direction, in the direction perpendicular to the thickness direction, the width of the end of the first segment 21 near the second surface 12 is equal to the width of the end of the second segment 22 near the first surface 11. That is, at the connection between the first segment 21 and the second segment 22, the first segment 21 and the second segment 22 have the same width. Therefore, it is convenient to stamp the notch 2, and there is no material accumulation at the connection between the first segment 21 and the second segment 22.
[0053] It is worth noting that, please refer to Figure 4 The end of the first segment 21 closest to the second surface 12 is the lower end of the first segment 21, and the end of the second segment 22 closest to the first surface 11 is the upper end of the second segment 22. Therefore, the width of the lower end of the first segment 21 is equal to the width of the upper end of the second segment 22.
[0054] Of course, for other alternative implementations, please refer to [link / reference]. Figure 5 On the cross section along the thickness direction, in the direction perpendicular to the thickness direction, there is a case where the width of the end of the first segment 21 near the second surface 12 is greater than the width of the end of the second segment 22 near the first surface 11. In this case, a stepped surface will be formed at the connection between the first segment 21 and the second segment 22.
[0055] In one embodiment, the second segment 22 has any two sidewalls in the circumferential direction, namely the first sidewall 221 and the second sidewall 222. The width change rate of the second segment 22 on the first sidewall 221 is j1, and the width change rate of the second segment 22 on the second sidewall 222 is j2, satisfying 0.9≤j1 / j2≤1.1. This configuration makes the second step a symmetrical or approximately symmetrical structure. When the notch 2 is stamped on the main body 1, the pressure borne by the first sidewall 221 and the second sidewall 222 (i.e., any two sidewalls) is balanced, allowing the material of the main body 1 to move uniformly towards both sides in the width direction, thereby improving the structural performance of the explosion-proof valve.
[0056] It is worth noting that, please refer to Figure 4 In this embodiment, the cross-sectional shape of the second segment 22 is an isosceles trapezoid at any cross-section along the thickness direction. Therefore, the second segment 22 is a symmetrical structure, i.e., j1 = j2. At this time, the rate of change of width of the second segment 22 is equal at any sidewall.
[0057] Of course, for other alternative implementations, please refer to [link / reference]. Figure 6 The width change rate j1 of the second segment on the first side wall 221 and the width change rate j2 of the second segment on the second side wall 222 may also be unequal.
[0058] Furthermore, in this embodiment, as Figure 4 As shown, the first segment 21 has any two sidewalls in the circumferential direction, namely the third sidewall 211 and the fourth sidewall 212. The width of the first segment changes at the rate of i1 on the third sidewall 211, and the width of the first segment changes at the rate of i2 on the fourth sidewall 212. Specifically, in this embodiment, please refer to... Figure 4At any cross-section along the thickness direction, the cross-sectional shape of the first segment 21 is square, therefore the first segment 21 is also a symmetrical structure, i.e., i1 = i2. At this time, the rate of change of width of the first segment 21 at any sidewall is equal.
[0059] Of course, for other alternative implementations, please refer to [link / reference]. Figure 6 The width change rate i1 of the first segment on the third side wall 211 and the width change rate i2 of the first segment on the fourth side wall 212 may also be unequal.
[0060] It is worth noting that, in the circumferential direction of the second segment 22, the angle between the first sidewall 221 and the second sidewall 222 can be any value from 0° to 360°; in the circumferential direction of the first segment 21, the angle between the third sidewall 211 and the fourth sidewall 212 can be any value from 0° to 360°.
[0061] Optionally, j1 / j2 can take any value from 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.1, or a value between any two values.
[0062] According to an embodiment of the present invention, another aspect provides a battery, comprising: a housing 3, with an opening at at least one end; a cover plate 4, connected to the housing 3 and sealing the opening, the housing 3 and the cover plate 4 forming an accommodating space; an explosion-proof valve for the battery, wherein the housing 3 and / or the cover plate 4 have a pressure relief port, the pressure relief port being connected to the accommodating space, and the explosion-proof valve of the battery covering the pressure relief port; and a battery cell disposed within the accommodating space.
[0063] Specifically, in this embodiment, such as Figure 7 As shown, the explosion-proof valve is mounted on the cover plate 4. Of course, in other alternative embodiments, the explosion-proof valve can also be mounted on the housing 3, or both the cover plate 4 and the housing 3 can be equipped with explosion-proof valves.
[0064] In one embodiment, such as Figure 7 As shown, the first surface 11 faces away from the receiving space, and the second surface 12 faces the receiving space. That is, the groove 2 is set on the side of the main body 1 facing away from the battery cell. Therefore, the flatter side of the explosion-proof valve (i.e., the second surface 12) faces the battery cell. When gas is generated inside the battery, the flatter side of the explosion-proof valve can more evenly bear the gas pressure inside the battery, avoid stress concentration of the explosion-proof valve, ensure the stability of the explosion-proof valve's burst pressure, and ensure the pressure relief effect of the battery.
[0065] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.
Claims
1. An explosion relief valve for a battery, characterized by include: The main body (1) has a first surface (11) and a second surface (12) arranged opposite to each other along the thickness direction. The main body (1) is recessed from the first surface (11) to the second surface (12) to form a groove (2). The groove (2) includes a first segment (21) and a second segment (22) connected along the thickness direction. In the direction perpendicular to the thickness direction, the width of the second segment (22) does not exceed the width of the first segment (21). The width change rate of the first segment (21) is i, and the width change rate of the second segment (22) is j, satisfying i < j.
2. The explosion relief valve of a battery according to claim 1, characterized in that On the cross section along the thickness direction, in the direction perpendicular to the thickness direction, the width of the second segment (22) near the first surface (11) is a1, and the width of the second segment (22) near the second surface (12) is a2, satisfying 0.03≤a2 / a1<1.
3. The explosion-proof valve for a battery according to claim 2, characterized in that, The width a1 of the second segment (22) near the first surface (11) satisfies 0.1mm≤a1≤2mm, and the width a2 of the second segment (22) near the second surface (12) satisfies 0.05mm≤a2≤1mm.
4. The explosion vent of a battery according to any one of claims 1 to 3, characterized in that In the cross section along the thickness direction, the depth of the first segment (21) is h1 and the depth of the second segment (22) is h2, satisfying h1≤h2.
5. A burst valve for a battery according to claim 4, wherein The depth h1 of the first segment (21) and the depth h2 of the second segment (22) satisfy 0.3 ≤ h1 / h2 ≤ 1; and / or, The depth h1 of the first segment (21) satisfies 0.1mm≤h1≤0.35mm, and the depth h2 of the second segment (22) satisfies 0.16mm≤h2≤0.4mm.
6. The explosion relief valve for a battery according to any one of claims 1 to 3, characterized in that In a cross section along the thickness direction, in a direction perpendicular to the thickness direction, the width of the end of the first segment (21) near the second surface (12) is equal to the width of the end of the second segment (22) near the first surface (11).
7. The explosion relief valve for a battery according to any one of claims 1 to 3, characterized in that The second segment (22) has any two sidewalls in the circumferential direction, namely the first sidewall (221) and the second sidewall (222). The width of the second segment (22) in the first sidewall (221) is j1, and the width of the second segment (22) in the second sidewall (222) is j2, satisfying 0.9≤j1 / j2≤1.
1.
8. The explosion relief valve of a battery according to any one of claims 1 to 3, characterized in that The width change rate i of the first segment (21) satisfies 0≤i≤0.3; the width change rate j of the second segment (22) satisfies 0.4≤j≤2.
9. A battery, characterized by include: The housing (3) has an opening at least at one end; A cover plate (4) is connected to the housing (3) and seals the opening; the housing (3) and the cover plate (4) enclose a receiving space. The explosion-proof valve of the battery according to any one of claims 1 to 8, wherein the housing (3) and / or the cover plate (4) are provided with a pressure relief port, the pressure relief port is in communication with the accommodating space, and the explosion-proof valve of the battery covers the pressure relief port; The battery cell is disposed within the receiving space.
10. The battery of claim 9, wherein, The first surface (11) faces away from the accommodation space, the second surface (12) faces towards the accommodation space.