battery

Abstract

The utility model relates to battery technical field discloses battery, include: shell, have first wall, first wall is equipped with mounting hole and liquid injection hole, boss, the first surface of first wall away from containing space is set up, flanging structure, set up in the space that the boss surrounds forms, with the inboard surface of boss is connected and sets up, explosion -proof valve, set up in the second surface of flanging structure away from containing space, with the boss welding setting, explosion -proof valve covers mounting hole, the utility model discloses through setting up flanging structure, set up explosion -proof valve in the one side of flanging structure away from containing space, utilize the shielding of flanging structure to part explosion -proof valve and the welding line of explosion -proof valve and boss, can block the electrolyte in the liquid injection process and the electrolyte in the battery inside pollute explosion -proof valve and welding line, avoid the corrosion that electrolyte causes to explosion -proof valve and the welding line of boss, guarantee the welding quality of explosion -proof valve and boss, avoid explosion -proof valve failure and unable to play the pressure -relief effect, guarantee the safety performance of battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to batteries. Background Technology

[0002] With the development of modern society and the increasing awareness of environmental protection, more and more devices are choosing lithium batteries as their power source, such as mobile phones, laptops, power tools, and electric vehicles. This provides a vast space for the application and development of lithium batteries. As power batteries develop, they are moving towards higher energy density, which also leads to increased heat generation during battery use and a greater risk of thermal runaway. Therefore, batteries typically include explosion-proof valves. In the event of thermal runaway, the electrolyte is directed to prevent the battery from exploding. However, in existing technologies, because the electrolyte injection port and the explosion-proof valve are located on the same side, during the electrolyte injection process, the electrolyte can easily corrode the explosion-proof valve and the weld lines between the explosion-proof valve and the battery casing, causing the explosion-proof valve to fail. Utility Model Content

[0003] In view of this, the present invention provides a battery to solve the problem that explosion-proof valves in the prior art are prone to failure.

[0004] This utility model provides a battery, comprising: a shell having a first wall, the first wall having an installation hole and an injection hole, the shell enclosing a receiving space; a boss protruding from a first surface of the first wall away from the receiving space and circumferentially surrounding the installation hole; a flange structure disposed within the space enclosed by the boss and connected to the inner side of the boss; and an explosion-proof valve disposed on a second surface of the flange structure away from the receiving space and welded to the boss, the explosion-proof valve covering the installation hole.

[0005] Beneficial effects: By setting up a flanged structure and placing the explosion-proof valve on the side of the flanged structure away from the receiving space, the flanged structure can shield part of the explosion-proof valve and the weld line between the explosion-proof valve and the boss. This can prevent the electrolyte during the liquid injection process and the electrolyte inside the battery from contaminating the explosion-proof valve and the weld line, avoid the electrolyte from corroding the weld line between the explosion-proof valve and the boss, ensure the welding quality of the explosion-proof valve and the boss, prevent the explosion-proof valve from failing and thus failing to perform its pressure relief function, and ensure the safety performance of the battery. Attached Figure Description

[0006] 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.

[0007] Figure 1 This is a schematic diagram of the overall structure of a battery according to an embodiment of the present utility model;

[0008] Figure 2 for Figure 1 A magnified view of part A in the diagram;

[0009] Figure 3 for Figure 1 Top view of the battery shown;

[0010] Figure 4 for Figure 3 Cross-sectional view along the BB direction;

[0011] Figure 5 for Figure 4 A magnified view of part of C;

[0012] Figure 6 This is a schematic diagram of the cover plate, boss, and flange structure of an embodiment of the present utility model.

[0013] Explanation of reference numerals in the attached figures:

[0014] 1. Outer shell; 11. Mounting hole; 12. Liquid injection hole; 13. First surface; 14. Shell; 15. Cover plate; 2. Boss; 3. Flanged structure; 31. Second surface; 32. Third surface; 4. Explosion-proof valve; 41. Weak area; 5. Battery cell; 6. Welding wire. Detailed Implementation

[0015] 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.

[0016] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0017] According to an embodiment of the present invention, a battery is provided, comprising: a housing 1 having a first wall, the first wall having a mounting hole 11 and a liquid injection hole 12, the housing 1 enclosing a receiving space; a boss 2 protruding from a first surface 13 of the first wall away from the receiving space and circumferentially surrounding the mounting hole 11; a flange structure 3 disposed within the space enclosed by the boss 2 and connected to the inner side of the boss 2; and an explosion-proof valve 4 disposed on a second surface 31 of the flange structure 3 away from the receiving space and welded to the boss 2, the explosion-proof valve 4 covering the mounting hole 11.

[0018] By setting a flange structure 3 and placing the explosion-proof valve 4 on the side of the flange structure 3 away from the receiving space, the flange structure 3 can shield part of the explosion-proof valve 4 and the welding line 6 between the explosion-proof valve 4 and the boss 2. This can prevent the electrolyte during the liquid injection process and the electrolyte inside the battery from contaminating the explosion-proof valve 4 and the welding line 6, avoid the electrolyte from corroding the welding line 6 between the explosion-proof valve 4 and the boss 2, ensure the welding quality between the explosion-proof valve 4 and the boss 2, prevent the explosion-proof valve 4 from failing and unable to perform its pressure relief function, and ensure the safety performance of the battery.

[0019] It should be noted that in related technologies, the explosion-proof valve 4 is welded to the side of the outer casing 1 near the receiving space, and the receiving space is filled with electrolyte. When the battery shakes, the electrolyte easily comes into contact with the explosion-proof valve 4, causing the explosion-proof valve 4 to be corroded by the electrolyte; in particular, the weak area 41 of the explosion-proof valve 4 is easily damaged after corrosion, which can easily affect the pressure relief effect of the explosion-proof valve 4 (leading to abnormal pressure relief of the battery). In this embodiment, please refer to... Figure 5 By protruding a boss 2 on the side of the outer shell 1 away from the accommodating space, the explosion-proof valve 4 is installed inside the boss 2, thereby increasing the distance between the explosion-proof valve 4 and the electrolyte, minimizing contact between the electrolyte and the explosion-proof valve 4, and ensuring the reliability of the explosion-proof valve 4.

[0020] Furthermore, in this embodiment, please refer to... Figure 1 , Figure 3 and Figure 6Both the injection hole 12 and the mounting hole 11 are opened on the first surface 13 of the outer casing 1. The mounting hole 11 is used to install the explosion-proof valve 4. Therefore, the injection hole 12 and the explosion-proof valve 4 are set on the same side. When electrolyte is injected into the battery through the injection hole 12, the electrolyte splashes and comes into contact with the explosion-proof valve 4. In related technologies, if the flange structure 3 is not provided, the electrolyte will gradually erode to the weld between the explosion-proof valve 4 and the boss 2, which can easily lead to weld failure under the corrosion of the electrolyte. When the battery experiences thermal runaway, the internal pressure of the battery increases, and the explosion-proof valve 4 may not burst in the weak area 41 but crack at the weld; or, when the battery is subjected to impact or collision, the weld between the explosion-proof valve 4 and the boss 2 may also easily crack; all of the above situations will cause the explosion-proof valve 4 to fail to perform its pressure relief function, which may lead to various safety risks such as battery explosion and the explosion-proof valve 4 flying out, resulting in low battery safety performance. In this embodiment, if Figure 5 As shown, by setting the flange structure 3 and placing the explosion-proof valve 4 on the side of the flange structure 3 away from the receiving space, the welding line 6 between the explosion-proof valve 4 and the boss 2 is also located on the side of the flange structure 3 away from the receiving space. Therefore, the flange structure 3 can prevent the electrolyte from corroding the welding line 6 between the explosion-proof valve 4 and the boss 2, ensuring the welding quality of the explosion-proof valve 4 and the boss 2, avoiding safety risks such as cracking of the welding line 6 and the explosion-proof valve 4 flying out, and improving the safety performance of the battery.

[0021] It should be further explained that, in this embodiment, by setting the boss 2 and the flange structure 3, and placing the explosion-proof valve 4 on the side of the flange structure 3 away from the accommodating space, the gas storage space of the battery can be increased, the occurrence of battery thermal runaway can be delayed, and the safety performance of the battery can be improved.

[0022] It is worth noting that when a battery experiences thermal runaway, explosion, or other safety issues, the thermal propagation can lead to an explosion of the entire battery pack. Therefore, the battery used in this embodiment can ensure the safety performance of the entire battery pack.

[0023] In one embodiment, such as Figure 1 and Figure 4As shown, the outer casing 1 includes a housing 14 and a cover plate 15. The housing 14 has at least one opening, and the cover plate 15 is connected to the housing 14 and seals the opening. The housing 14 and the cover plate 15 enclose and form an accommodating space. Specifically, in the first case, along the z-direction, the upper end of the housing 14 is open, and the lower end of the housing 14 is an integrally formed bottom plate structure. Therefore, the cover plate 15 is provided corresponding to the upper end of the housing 14, and the injection hole 12 and the explosion-proof valve 4 are both provided on the cover plate 15. The side of the cover plate 15 away from the accommodating space is the aforementioned first surface 13. In the second case, along the z-direction, both the upper and lower ends of the housing 14 are open. The upper cover plate is provided corresponding to the upper opening, and the lower cover plate is provided corresponding to the lower opening. The injection hole 12 and the explosion-proof valve 4 are both provided on the upper cover plate. The side of the upper cover plate away from the accommodating space is the aforementioned first surface 13. In the third case, along the z-direction, the lower end of the housing 14 is open, and the upper end of the housing 14 is an integrally formed top plate structure. Therefore, the cover plate 15 is provided corresponding to the lower end of the housing 14, and the injection hole 12 and the explosion-proof valve 4 are both provided on the top plate structure. The side of the top plate structure away from the accommodating space is the aforementioned first surface 13.

[0024] In one embodiment, such as Figure 4 As shown, the battery also includes a cell 5, which is disposed within the housing space.

[0025] In one embodiment, such as Figure 5 As shown, along the z-direction, the height of the side of the boss 2 away from the outer shell 1 to the first surface 13 is h1, satisfying 0.4mm≤h1≤10mm. This configuration facilitates the installation of the flange structure 3 and ensures sufficient distance between the explosion-proof valve 4 and the electrolyte for protection of the explosion-proof valve 4, while avoiding excessive volume occupied by the external contour of the battery, thus guaranteeing the battery's space utilization and energy density.

[0026] It is worth noting that if h1 < 0.4 mm, the height space of the boss 2 is too small, which makes it difficult to set the flange structure 3 on the boss 2. In addition, it will cause the distance between the flange structure 3 and the receiving space to still be too small. The electrolyte in the receiving space will still easily come into contact with the explosion-proof valve 4, which will cause the explosion-proof valve 4 to be corroded and damaged, and thus the pressure relief effect of the explosion-proof valve 4 will be easily affected. If h1 > 10 mm, the boss 2 protrudes too much, which will cause the entire battery to occupy too much space, resulting in low space utilization and low energy density of the battery.

[0027] Optionally, h1 can be any value from 0.4mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, or a value between any two of these values.

[0028] In one embodiment, such as Figure 5 As shown, along the z-direction, the height from the side of the boss 2 away from the outer shell 1 to the second surface 31 is h2, and the height from the third surface 32 of the flange structure 3 near the receiving space to the first surface 13 is h3, satisfying 0.1≤h2 / h3≤18. This arrangement ensures that the explosion-proof valve 4 has sufficient distance from the electrolyte to protect it, while also facilitating the welding of the explosion-proof valve 4 to the boss 2 and ensuring the structural strength of the explosion-proof valve 4.

[0029] It is worth noting that, in this embodiment, as Figure 5 As shown, the condition h1 = h2 + h3 + thickness of the flange structure is satisfied. Therefore, when the thickness of the flange structure 3 is fixed, if h2 / h3 < 0.1, it means that h2 is too small and h3 is too large, resulting in insufficient space for the installation of the explosion-proof valve 4. This can easily cause the explosion-proof valve 4 to protrude from the boss 2, making it difficult to weld the explosion-proof valve 4 to the boss 2 and failing to guarantee the welding quality between the explosion-proof valve 4 and the boss 2. If the goal is to prevent the explosion-proof valve 4 from protruding from the boss 2, the thickness of the explosion-proof valve 4 in the z-direction needs to be reduced, resulting in lower structural strength of the explosion-proof valve 4, which can easily affect the welding strength between the explosion-proof valve 4 and the boss 2. If h2 / h3 > 18, it means that h2 is too large and h3 is too small, resulting in insufficient distance between the flange structure 3 and the receiving space. The electrolyte in the receiving space can still easily come into contact with the explosion-proof valve 4, causing corrosion and damage to the explosion-proof valve 4, which in turn can easily affect the pressure relief effect of the explosion-proof valve 4.

[0030] It should be noted that, as Figure 5 As shown, the second surface 31 and the third surface 32 are the two surfaces of the flange structure 3 that are arranged opposite each other along the z-direction. Further, as... Figure 5 As shown, the second surface 31 is the upper surface of the flange structure 3, and the third surface 32 is the lower surface of the flange structure 3.

[0031] Optionally, h2 / h3 can take any value from 0.1, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, or a value between any two values.

[0032] In one embodiment, such as Figure 5As shown, the height h2 from the side of the boss 2 away from the outer casing 1 to the second surface 31 satisfies 0.2mm≤h2≤4mm. This setting ensures that the explosion-proof valve 4 has sufficient distance from the electrolyte to protect the explosion-proof valve 4 and to ensure the space utilization of the battery, while also facilitating the welding of the explosion-proof valve 4 to the boss 2 and ensuring the structural strength of the explosion-proof valve 4.

[0033] It is worth noting that if h2 < 0.2mm, the installation height space of the explosion-proof valve 4 will be too small, which may cause the explosion-proof valve 4 to protrude from the boss 2, making it difficult to weld the explosion-proof valve 4 to the boss 2 and failing to guarantee the welding quality of the explosion-proof valve 4 to the boss 2. If the explosion-proof valve 4 is to be prevented from protruding from the boss 2, the thickness of the explosion-proof valve 4 in the z direction needs to be reduced, resulting in lower structural strength of the explosion-proof valve 4, which may affect the welding strength between the explosion-proof valve 4 and the boss 2. If h2 > 4mm, when the size of h1 is fixed, the size of h3 will be too small, resulting in a small distance between the flange structure 3 and the receiving space. The electrolyte in the receiving space may still come into contact with the explosion-proof valve 4, causing the explosion-proof valve 4 to be corroded and damaged, which may affect the pressure relief effect of the explosion-proof valve 4. When the size of h3 is fixed, the size of h1 will be too large, and the boss 2 will protrude too much, resulting in an excessive space occupied by the entire battery, resulting in low space utilization and low energy density of the battery.

[0034] Optionally, h2 can be any value from 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, or a value between any two of these values.

[0035] In one embodiment, such as Figure 5 As shown, the height h3 of the flange structure 3 from the third surface 32 near the accommodating space to the first surface 13 satisfies 0.2mm≤h3≤6mm. This arrangement ensures sufficient distance between the explosion-proof valve 4 and the electrolyte for protection, while also maximizing battery space utilization, facilitating welding of the explosion-proof valve 4 to the boss 2, and ensuring the structural strength of the explosion-proof valve 4.

[0036] It is worth noting that if h3 < 0.2mm, the distance between the flange structure 3 and the receiving space is too small, and the electrolyte in the receiving space can still easily come into contact with the explosion-proof valve 4, causing the explosion-proof valve 4 to be corroded and damaged, which in turn affects the pressure relief effect of the explosion-proof valve 4. If h3 > 6mm, when the size of h1 is fixed, the size of h2 will be too small, resulting in too little space for the installation height of the explosion-proof valve 4. This can easily cause the explosion-proof valve 4 to protrude from the boss 2, making it difficult to weld the explosion-proof valve 4 to the boss 2 and failing to guarantee the welding quality between the explosion-proof valve 4 and the boss 2. If the explosion-proof valve 4 is not to protrude from the boss 2, the thickness of the explosion-proof valve 4 in the z direction needs to be reduced, resulting in lower structural strength of the explosion-proof valve 4, which can easily affect the welding strength between the explosion-proof valve 4 and the boss 2. When the size of h2 is fixed, the size of h1 will be too large, and the boss 2 will protrude too much, resulting in the entire battery occupying too much space, resulting in low space utilization and low energy density of the battery.

[0037] Optionally, h3 can be any value from 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 5.2mm, 5.5mm, 5.8mm, 6mm, or a value between any two of these values.

[0038] In one embodiment, such as Figure 5 As shown, along the x-direction, the length from the end of the flanged structure 3 away from the boss 2 to the inner side of the boss 2 is a1; the explosion-proof valve 4 has a weak area 41, and the weak area 41 and the orthographic projection of the flanged structure 3 on the first surface 13 do not coincide. Along the x-direction, the length from the weak area 41 to the end of the flanged structure 3 away from the boss 2 is a2; satisfying 0.2≤a1 / a2≤18. This configuration ensures the pressure relief effect of the explosion-proof valve 4 while also ensuring the blocking effect of the flanged structure 3 on the electrolyte and its supporting role for the explosion-proof valve 4.

[0039] It is worth noting that if a1 / a2 < 0.2, it means that the size of a1 is too small and the size of a2 is too large, resulting in an insufficient mating area between the flange structure 3 and the explosion-proof valve 4. The flange structure 3 cannot effectively shield the explosion-proof valve 4, and the electrolyte can still easily corrode the weld line 6 between the explosion-proof valve 4 and the boss 2, affecting the welding quality between the explosion-proof valve 4 and the boss 2. This can easily lead to safety risks such as cracking of the weld line 6 and the explosion-proof valve 4 flying out, resulting in low battery safety performance. Furthermore, the flange structure 3 provides poor support for the explosion-proof valve 4, resulting in low installation stability of the explosion-proof valve 4. If a1 / a2 > 18, it means that the size of a1 is too large and the size of a2 is too small, that is, the distance between the flange structure 3 and the weak area 41 of the explosion-proof valve 4 is too close. When the internal pressure of the battery increases, the gas is not easy to break through the explosion-proof valve 4 in the weak area 41, affecting the pressure relief effect of the battery and easily leading to safety risks such as battery explosion, resulting in low battery safety performance.

[0040] Optionally, the value of a1 / a2 can be any one of the following: 0.2, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, or a value between any two of these values.

[0041] In one embodiment, such as Figure 5 As shown, the length a1 from the end of the flange structure 3 away from the boss 2 to the inner side of the boss 2 satisfies 1mm≤a1≤10mm. This setting ensures that the flange structure 3 can block the electrolyte and support the explosion-proof valve 4, while avoiding affecting the pressure relief effect of the explosion-proof valve 4 and ensuring the structural strength of the battery.

[0042] It is worth noting that if a1 < 1mm, the mating area between the flange structure 3 and the explosion-proof valve 4 is too small. The flange structure 3 cannot effectively shield the explosion-proof valve 4, and the electrolyte can still easily corrode the weld line 6 between the explosion-proof valve 4 and the boss 2, affecting the welding quality between the explosion-proof valve 4 and the boss 2. This can easily cause safety risks such as cracking of the weld line 6 and the explosion-proof valve 4 flying out, resulting in low battery safety performance. Furthermore, the flange structure 3 provides poor support for the explosion-proof valve 4, leading to low installation stability of the explosion-proof valve 4. If a1 > 10mm, when the dimensions of a1 + a2 are fixed (i.e., the distance from the weak area 41 to the inner side of the boss 2 is fixed), the dimension of a2 will be too small, and the distance between the flange structure 3 and the weak area 41 of the explosion-proof valve 4 will be too close. When the pressure inside the battery increases, the gas will not easily break through the explosion-proof valve 4 in the weak area 41, affecting the pressure relief effect of the battery and easily leading to safety risks such as battery explosion, resulting in low battery safety performance. When the dimension of a2 is fixed, the dimensions of a1 + a2 will be too large (i.e., the distance from the weak area 41 to the inner side of the boss 2 will be too large). If the overall area of ​​the explosion-proof valve 4 is fixed, the area enclosed by the weak area 41 will be small, making it difficult for gas to be released from inside the battery. If it is necessary to ensure that the area enclosed by the weak area 41 is sufficient (i.e., the explosion-proof valve 4 has sufficient exhaust area), the overall area of ​​the explosion-proof valve 4 will be too large, and the explosion-proof valve 4 will occupy too large an area on the outer shell 1, making the range of the mounting hole 11 opened on the outer shell 1 too large, resulting in weakened structural strength of the outer shell 1 and affecting the structural strength of the battery.

[0043] Optionally, the value of a1 can be any value among 1mm, 1.5mm, 1.8mm, 2mm, 2.5mm, 2.8mm, 3mm, 3.5mm, 3.8mm, 4mm, 4.5mm, 4.8mm, 5mm, 5.5mm, 5.8mm, 6mm, 6.5mm, 6.8mm, 7mm, 7.5mm, 7.8mm, 8mm, 8.5mm, 8.8mm, 9mm, 9.5mm, 9.8mm, and 10mm, or a value between any two of these values.

[0044] In one embodiment, such as Figure 5 As shown, the length a2 from the weak zone 41 to the end of the flange structure 3 away from the boss 2 satisfies 0.5mm≤a2≤6mm. This setting ensures the pressure relief effect of the explosion-proof valve 4 and the structural strength of the battery, while also ensuring the blocking effect of the flange structure 3 on the electrolyte and its supporting role for the explosion-proof valve 4.

[0045] It is worth noting that if a2 < 0.5mm, the distance between the flange structure 3 and the weak area 41 of the explosion-proof valve 4 is too close. When the internal pressure of the battery increases, the gas is unlikely to break through the explosion-proof valve 4 in the weak area 41, affecting the pressure relief effect of the battery and easily leading to safety risks such as battery explosion. The battery safety performance is low. If a2 > 6mm, when the dimensions a1 + a2 are fixed (that is, the distance from the weak area 41 to the inner side of the boss 2 is fixed), the dimension a1 will be too small, and the mating area between the flange structure 3 and the explosion-proof valve 4 will be too small. The flange structure 3 cannot effectively shield the explosion-proof valve 4, and the electrolyte can still easily corrode the weld line 6 between the explosion-proof valve 4 and the boss 2, affecting the welding quality between the explosion-proof valve 4 and the boss 2. This can easily cause safety risks such as cracking of the weld line 6 and the explosion-proof valve 4 flying out. The battery safety performance is low. In addition, the flange structure 3 provides poor support for the explosion-proof valve 4, resulting in low installation stability of the explosion-proof valve 4. When the dimension a1 is fixed, the dimension a1+a2 will be too large (that is, the distance from the weak area 41 to the inner side of the boss 2 will be too large). If the overall area of ​​the explosion-proof valve 4 is fixed, the area enclosed by the weak area 41 will be small, making it difficult for gas to be released from the inside of the battery. If it is necessary to ensure that the area enclosed by the weak area 41 is sufficient (that is, the explosion-proof valve 4 has sufficient exhaust area), the overall area of ​​the explosion-proof valve 4 will be too large. The explosion-proof valve 4 occupies too much area on the outer shell 1, making the range of the mounting hole 11 opened on the outer shell 1 too large, which weakens the structural strength of the outer shell 1 and affects the structural strength of the battery.

[0046] Optionally, the value of a2 can be any value among 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm, 5.2mm, 5.5mm, 5.8mm, and 6mm, or a value between any two of these values.

[0047] In one embodiment, such as Figure 3 As shown, along the x-direction, the minimum distance between the injection hole 12 and the edge of the explosion-proof valve 4 is a3, satisfying 2mm≤a3≤40mm. This setting reduces the contamination of the explosion-proof valve 4 by the electrolyte during the injection process, while also reducing the impact of the electrolyte on the electrode post.

[0048] It is worth noting that if a3 < 2mm, the distance between the injection hole 12 and the explosion-proof valve 4 is too close. When electrolyte is injected into the battery through the injection hole 12, if the electrolyte splashes, there is still a risk of contact with the explosion-proof valve 4, which will affect the welding quality between the explosion-proof valve 4 and the boss 2. This can easily cause safety risks such as cracking of the weld line 6 and the explosion-proof valve 4 flying out, resulting in lower battery safety performance. If a3 > 40mm, the distance between the injection hole 12 and the explosion-proof valve 4 is too far, which can easily lead to the injection hole 12 and the terminal being too close. This makes it easy for the electrolyte to come into contact with the terminal and contaminate it, thereby causing corrosion damage to the terminal.

[0049] Optionally, the value of a3 can be any value from 2mm, 5mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 32mm, 35mm, 38mm, 40mm, or a value between any two of these values.

[0050] Furthermore, in one embodiment, when 2mm≤a3≤40mm is satisfied, the length a1 from the end of the flange structure 3 away from the boss 2 to the inner side of the boss 2 and the length a2 from the weak area 41 to the end of the flange structure 3 away from the boss 2 satisfy 0.2≤a1 / a2≤16. By controlling the size of a3, the distance between the injection hole 12 and the explosion-proof valve 4 is ensured, which can minimize the contamination of the explosion-proof valve 4 by the electrolyte. Therefore, the range of a1 / a2 is further limited. Even if the mating area between the flange structure 3 and the explosion-proof valve 4 is relatively reduced, the electrolyte can still be prevented from eroding the weld line 6 between the explosion-proof valve 4 and the boss 2, ensuring the welding quality between the explosion-proof valve 4 and the boss 2, avoiding safety risks such as cracking of the weld line 6 and the explosion-proof valve 4 flying out, improving the safety performance of the battery, and reducing the material consumption of the flange structure 3, reducing production costs, and reducing the overall weight of the battery, which is conducive to the realization of battery lightweighting.

[0051] It is worth noting that in this embodiment, the z-direction is the height direction of the battery, and the x-direction is the length direction of the battery. The z-direction and the x-direction are perpendicular to each other.

[0052] 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. A battery, characterized in that, include: The outer shell (1) has a first wall, the first wall having an installation hole (11) and an injection hole (12), and the outer shell (1) encloses to form an accommodating space; A boss (2) protrudes from the first surface (13) of the first wall away from the receiving space and is circumferentially arranged around the mounting hole (11); The flange structure (3) is disposed within the space enclosed by the boss (2) and is connected to the inner side of the boss (2); An explosion-proof valve (4) is disposed on the second surface (31) of the flange structure (3) away from the receiving space and is welded to the boss (2). The explosion-proof valve (4) covers the mounting hole (11).

2. The battery according to claim 1, characterized in that, Along the z-direction, the height of the side of the boss (2) away from the outer shell (1) to the first surface (13) is h1, which satisfies 0.4mm≤h1≤10mm.

3. The battery according to claim 1 or 2, characterized in that, Along the z-direction, the height of the side of the boss (2) away from the outer shell (1) to the second surface (31) is h2, and the height of the flange structure (3) near the third surface (32) of the accommodating space to the first surface (13) is h3, satisfying 0.1≤h2 / h3≤18.

4. The battery according to claim 3, characterized in that, The height h2 of the side of the boss (2) away from the outer shell (1) to the second surface (31) satisfies 0.2mm≤h2≤4mm.

5. The battery according to claim 3, characterized in that, The height h3 of the flange structure (3) from the third surface (32) near the accommodating space to the first surface (13) satisfies 0.2mm≤h3≤6mm.

6. The battery according to claim 1 or 2, characterized in that, Along the x-direction, the length from the end of the flange structure (3) away from the boss (2) to the inner side of the boss (2) is a1; the explosion-proof valve (4) has a weak area (41), the orthographic projection of the weak area (41) and the flange structure (3) on the first surface (13) does not coincide, and along the x-direction, the length from the end of the weak area (41) to the end of the flange structure (3) away from the boss (2) is a2; satisfying 0.2≤a1 / a2≤18.

7. The battery according to claim 6, characterized in that, The length a1 of the flange structure (3) from the end away from the boss (2) to the inner side of the boss (2) satisfies 1mm≤a1≤10mm.

8. The battery according to claim 6, characterized in that, The length a2 from the weak area (41) to the end of the flange structure (3) away from the boss (2) satisfies 0.5mm≤a2≤6mm.

9. The battery according to claim 6, characterized in that, Along the x-direction, the minimum distance between the injection hole (12) and the edge of the explosion-proof valve (4) is a3, which satisfies 2mm≤a3≤40mm.

10. The battery according to claim 9, characterized in that, The length a1 of the flange structure (3) from the end away from the boss (2) to the inner side of the boss (2) and the length a2 of the weak area (41) from the end of the flange structure (3) away from the boss (2) satisfy 0.2≤a1 / a2≤16.

11. The battery according to claim 1 or 2, characterized in that, The outer casing (1) includes a casing (14) and a cover plate (15). The casing (14) has at least one opening. The cover plate (15) is connected to the casing (14) and seals the opening. The casing (14) and the cover plate (15) enclose the receiving space. The battery also includes a cell (5) disposed within the receiving space.

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