Battery, battery pack and electric equipment

Abstract

The utility model relates to a battery, a battery pack and electric equipment. The battery has the length L, the thickness D and the height H, and L is larger than D, L is larger than H, and L is larger than or equal to 300 mm and smaller than or equal to 2000 mm. The battery comprises at least one anti-explosion valve, the anti-explosion valve is arranged on the side face adjacent to the large face of the battery, and the distance D1 between the edge of the anti-explosion valve and the large face meets the requirement that D1 is larger than or equal to 1 mm and smaller than D / 2. The total area of the anti-explosion valve is S; the battery capacity C is more than or equal to 50Ah and less than or equal to 300Ah, and S and C meet the relational expression C: S = 0.1-1.5 (Ah / mm < 2 >). The range of D1 can prevent stress concentration of the explosion-proof valve, improve reliability and ensure that the explosion-proof valve has enough exhaust area. The lower limit value of S can ensure that the explosion-proof valve can quickly discharge high-temperature and high-pressure gas-liquid substances during thermal failure; the upper limit of S is used for avoiding the problems that the area of the anti-explosion valve is too large, the valve element is not prone to reaching the opening threshold value, and the opening error is large.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular, to a battery, a battery pack, and an electrical device. Background Art

[0002] Thermal safety issues need to be considered during the use of batteries, so batteries usually need to be designed with explosion-proof valves to meet the battery's need to release pressure when thermal runaway occurs, to prevent safety issues such as fire and explosion caused by excessive pressure and temperature inside the battery. The cross-sectional area of ​​the exhaust part of the explosion-proof valve determines the exhaust efficiency of the explosion-proof valve. In the prior art, two problems are prone to occur when designing the explosion-proof valve. First, the cross-sectional area of ​​the exhaust part of the explosion-proof valve is small, resulting in the inability to discharge high-temperature and high-pressure gas and liquid substances in a timely and rapid manner; second, the cross-sectional area of ​​the exhaust part of the explosion-proof valve is large, resulting in the explosion-proof valve being difficult to open (high threshold), with a large opening error, and the problem that the internal pressure of the battery reaches the threshold but the explosion-proof valve does not open is prone to occur. Utility Model Content

[0003] The purpose of the present disclosure is to provide a battery, a battery pack, and an electrical device to at least partially solve the problems existing in the related art.

[0004] In order to achieve the above-mentioned object, the present disclosure provides a battery, the battery has a length L, a thickness D, and a height H and satisfies L>D, L>H, 300mm≤L≤2000mm; the battery includes at least one explosion-proof valve, the explosion-proof valve is arranged on the side adjacent to the large surface of the battery, and the distance between the edge of the explosion-proof valve close to the large surface and the large surface is D1 and satisfies 1mm≤D1<D / 2; the total area of ​​the at least one explosion-proof valve is S; the battery capacity C satisfies: 50Ah≤C≤300Ah, and the total area S of the at least one explosion-proof valve and the battery capacity C satisfy the relationship C: S=0.1~1.5(Ah / mm 2 ).

[0005] Optionally, the battery is constructed as a rectangular parallelepiped structure having long sides, high sides and thick sides, the long sides and the thick sides form a first side surface, and at least one explosion-proof valve is arranged on the first side surface.

[0006] Optionally, one or two explosion-proof valves are provided on the first side surface in the length direction of the battery, wherein 300mm≤L≤600mm.

[0007] Optionally, at least three explosion-proof valves are provided on the first side surface in the length direction of the battery, wherein 600mm<L≤2000mm.

[0008] Optionally, the high side and the thick side form a second side surface, wherein a distance L1 between the explosion-proof valve located on the first side surface and the second side surface satisfies L1>100 mm.

[0009] Optionally, the explosion-proof valve is centrally arranged between the two large surfaces.

[0010] Optionally, the high side and the thick side form a second side surface, and at least one explosion-proof valve is arranged on the second side surface.

[0011] Optionally, the battery is constructed as a rectangular structure having long sides, tall sides and thick sides, the long sides and the thick sides form a first side surface, and the tall sides and the thick sides form a second side surface, wherein the battery poles are arranged on the first side surface, and the at least one explosion-proof valve is entirely arranged on the second side surface; or the battery poles are arranged on the second side surface, and the at least one explosion-proof valve is entirely arranged on the first side surface.

[0012] Optionally, a shell is included, and the explosion-proof valve and the shell are integrally stamped and formed, or the explosion-proof valve and the shell are welded and connected.

[0013] According to a second aspect of the present disclosure, there is provided a battery pack comprising the above-mentioned battery.

[0014] According to a third aspect of the present disclosure, there is provided an electrical device comprising the above-mentioned battery pack.

[0015] Through the above technical solution, 1mm≤D1 can keep a certain distance between the explosion-proof valve and the large surface, prevent the large surface from expanding during normal operation of the battery, causing stress concentration at the explosion-proof valve, and improve the reliability of the explosion-proof valve. At the same time, ensuring a certain distance is conducive to the welding reliability between the explosion-proof valve and the battery shell; D1<D / 2 can ensure that there is enough space on the side of the battery in the thickness direction to install the explosion-proof valve, that is, to ensure that the explosion-proof valve can have a predetermined exhaust area to ensure the safety of the battery. Since C is a fixed value, the lower limit of S can ensure that the area of ​​the explosion-proof valve meets the requirements that the battery can quickly discharge the internal high-temperature and high-pressure gas and liquid substances when it fails, and meet the exhaust efficiency; the upper limit of S is to avoid the explosion-proof valve area being too large, and to avoid the valve core from not being easy to reach the opening threshold, resulting in large opening errors and failure to open in time.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0018] Figure 1 is a schematic diagram of a battery in the prior art exemplarily shown according to the present disclosure;

[0019] Figure 2 is a schematic diagram of a battery exemplarily shown according to the present disclosure;

[0020] Figure 3 is a schematic diagram of another battery exemplarily shown according to the present disclosure;

[0021] Figure 4 is a schematic diagram of another battery exemplarily shown according to the present disclosure;

[0022] Figure 5 is a schematic diagram of another battery exemplarily shown according to the present disclosure;

[0023] Figure 6 is a schematic diagram of another battery exemplarily shown according to the present disclosure;

[0024] Figure 7 is a schematic diagram of another battery exemplarily shown according to the present disclosure;

[0025] Figure 8 is a schematic diagram of another battery exemplarily shown according to the present disclosure;

[0026] Fig. 9 is a schematic diagram of another battery exemplarily shown according to the present disclosure;

[0027] Fig.10 is a top view of a first side of a battery exemplarily shown in the present disclosure;

[0028] Fig.11 yes Fig.10 A partial enlarged view of part D.

[0029] Description of Reference Numerals

[0030] 100-explosion-proof valve; 200-shell; 201-long side; 202-high side; 203-thick side; 210-first side; 220-second side; 230-large side; 300-pole. DETAILED DESCRIPTION

[0031] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0032] In the present disclosure, unless otherwise specified, directional words such as "up, down, left, right" may be based on the direction of the drawing of the accompanying drawings. For example, the "left" side of the battery and the "bottom" side of the battery are hidden and cannot be shown. The "left" side here refers to the side of the battery close to the left side in the relevant drawing; the "bottom" side refers to the side of the battery close to the bottom side in the drawing.

[0033] In the present disclosure, the terms "first", "second", etc. are used to distinguish one element from another element, and do not have order and importance. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0034] In order to facilitate the understanding of the technical solution of the present disclosure, it is necessary to introduce that during the use of the battery, thermal safety issues need to be considered. Therefore, the battery is usually designed with an explosion-proof valve to meet the rapid pressure relief of the battery when thermal runaway occurs, to prevent the internal pressure and runaway temperature of the battery from rising sharply, resulting in shell rupture, battery fire, explosion and other safety issues. Among them, the structure of the explosion-proof valve includes the following main components: ① Safety cover: a structure located above the battery, usually made of metal or plastic, used to protect internal components and fix the position of other components; ② Pressure sensing device: usually a film or spring, used to sense the change of internal pressure of the battery; ③ Pressure release channel: a channel connecting the internal and external environment of the battery, used to release excessive internal pressure. Its main function is: when the internal pressure or temperature of the battery is too high and exceeds the safety range, the explosion-proof valve will automatically open, release excess gas or liquid, reduce pressure and temperature to prevent battery explosion, thermal rupture, etc. The technical solution of the present disclosure is based on the above basic background to improve the number, layout position, structure, size and other elements of the battery explosion-proof valve so that the explosion-proof valve can meet the corresponding protection function, see below for details. It should be noted that the battery introduced in the present disclosure can be used alone or multiple batteries can be combined to form a battery pack.

[0035] Various embodiments will be introduced from different aspects below, but it should be pointed out that there are some repeated contents in multiple embodiments, and different parts of these embodiments can be combined with each other without contradiction.

[0036] First of all, it should be pointed out that the size of the battery mentioned here refers to its overall external size, that is, the battery's thickness, height, length, volume and other parameters are all based on the shell, that is, the length of the battery refers to the length of the shell, and the thickness of the battery refers to the thickness of the shell. This point will not be repeated below. It should also be pointed out that the length direction, height direction and thickness direction are defined based on the usual direction of the sheet-shaped battery. The length direction refers to the extension direction of the longest side, and the thickness direction is usually the extension direction of the shortest side.

[0037] After understanding the above basic situation, the following will start to introduce in detail different embodiments.

[0038] 1. The cross-sectional area of ​​the explosion-proof valve (the cross-sectional area of ​​the passageway through which the explosion-proof valve releases gas, i.e., the opening area)

[0039] First embodiment:

[0040] Reference Figure 2-Figure 9 In this embodiment, a battery is provided, the battery has a length L, a thickness D, a height H and satisfies L>D, L>H, 300mm≤L≤2000mm, wherein the length L corresponds to the X-direction dimension in the figure, the thickness D corresponds to the Y-direction dimension in the figure, the height H corresponds to the Z-direction dimension in the figure, and L can be 300mm, 1200mm, 2000mm, etc.; the battery includes at least one explosion-proof valve 100, which can be 1, 2, 3, etc. The explosion-proof valve 100 is arranged on the side adjacent to the large surface 230 of the battery, and the distance between the edge of the explosion-proof valve 100 close to the large surface 230 and the large surface 230 is D1 and satisfies 1mm≤D1<D / 2, where the "large surface 230" refers to the wall with the largest area of ​​the battery, that is, the wall formed by the long side and the high side mentioned below; the side adjacent to the large surface 230 refers to the other wall of the battery except the large surface 230, such as the first side and the second side mentioned below. The total area of ​​at least one explosion-proof valve 100 is S, the battery capacity C satisfies: 50Ah≤C≤300Ah, and the total area S of at least one explosion-proof valve 100 and the battery capacity C satisfy the relationship C: S=0.1~1.5(Ah / mm 2 It should be explained that the cross-sectional area here refers to the cross-sectional area of ​​the portion of the explosion-proof valve 100 used for exhaust, that is, the opening area, which is used to indicate the exhaust capacity of the explosion-proof valve 100.

[0041] In the embodiment of the present disclosure, C:S can be 0.1Ah / mm 2 , 1Ah / mm 2 , 1.5Ah / mm 2 wait.

[0042] In addition, the present disclosure does not limit the type of battery, for example, it can be a long battery, a blade battery, etc.

[0043] It should be explained that the working principle of the explosion-proof valve 100 is that when thermal runaway occurs inside the battery and causes the internal pressure or temperature to be greater than the opening threshold of the explosion-proof valve 100, the valve core of the explosion-proof valve 100 can be opened to exhaust, release pressure and cool down.

[0044] By using the above technical solution, 1mm≤D1 can keep a certain distance between the explosion-proof valve 100 and the large surface 230, prevent the large surface 230 from expanding when the battery is working normally, causing stress concentration at the explosion-proof valve 100, improve the reliability of the explosion-proof valve 100, and ensure a certain distance is conducive to the welding reliability between the explosion-proof valve 100 and the battery shell; D1<D / 2 can ensure that the side of the battery has enough space in the thickness direction to install the explosion-proof valve 100, that is, to ensure that the explosion-proof valve 100 can have a predetermined exhaust area to ensure the safety of the battery. Since C is a fixed value, the lower limit of S can ensure that the area of ​​the explosion-proof valve 100 meets the requirements that the battery can quickly discharge the internal high-temperature and high-pressure gas and liquid substances when it fails, and meet the exhaust efficiency; the upper limit of S is to avoid the explosion-proof valve 100 area being too large, and to avoid the valve core from not being easy to reach the opening threshold, resulting in large opening errors and failure to open in time.

[0045] To facilitate the following description, the various sides of the battery are named here, refer to Figure 2-Figure 9 In some embodiments, the battery can be constructed as a rectangular parallelepiped structure having a long side 201, a high side 202, and a thick side 203. The long side 201 and the thick side 203 can form a first side surface 210, the high side 202 and the thick side 203 can form a second side surface 220, and the high side 202 and the long side 201 can form a large surface 230. The first side surface 210, the second side surface 220, and the large surface 230 will not be explained below. Of course, the present disclosure does not limit the structure of the battery to Figure 2-Figure 9 The rectangular parallelepiped structure shown is only for illustrative purposes.

[0046] Reference Figure 2-Figure 3 , Figure 5-Figure 9 In some embodiments, at least one explosion-proof valve 100 may be arranged on the first side 210. With such a design, compared with arranging the explosion-proof valve 100 only on one second side 220, the exhaust path of the explosion-proof valve 100 located on the first side 210 from any position of the battery is shorter than the length of the battery, so that when any position of the battery fails, the pressure can be quickly released through the explosion-proof valve 100 on the first side 210. The present disclosure does not limit the number of explosion-proof valves 100 on the first side 210, for example, it can be one, two, three, etc., and can be specifically designed according to the adaptability of the length of the battery.

[0047] Specifically, in some embodiments, the first side 210 may be provided with one or two explosion-proof valves 100 in the length direction of the battery, where 300mm≤L≤600mm. In addition, in some other embodiments, the first side 210 may be provided with at least three explosion-proof valves 100 in the length direction of the battery, where 600mm<L≤2000mm. The longer the battery is, the more explosion-proof valves 100 are provided in the length direction, so that when failure occurs at any position of the battery, pressure relief can be performed through a closer explosion-proof valve 100.

[0048] In some embodiments, the distance L1 between the explosion-proof valve 100 located on the first side 210 and the second side 220 can satisfy L1>100mm. Such a design is more conducive to using fewer explosion-proof valves 100 to meet the pressure relief requirements of the battery. Specifically, when L1<100mm, that is, the explosion-proof valve 100 closest to the second side 220 is closer to the second side 220, which will result in the need to arrange more explosion-proof valves 100 at a position greater than 100mm away from the second side 220 to meet the pressure relief requirements, especially when there is an explosion-proof valve 100 on the second side 220, arranging an additional explosion-proof valve 100 at a position on the first side 210 closer to the second side 220 will result in a waste of explosion-proof valves 100. On the contrary, when the explosion-proof valve 100 satisfies L1>100mm, the explosion-proof valve 100 closest to the second side 220 can protect the portion of the battery close to the second side 220 and the other portion away from the second side 220, thereby maximizing the protection range of the explosion-proof valve 100. It should be noted that when L1>100mm, it can be 110mm, 150mm, etc., as long as it satisfies that when thermal failure occurs at any position of the battery, there is an explosion-proof valve 100 that can quickly discharge high-temperature and high-pressure gas and liquid substances.

[0049] Reference Figure 2-Figure 9 In some embodiments, the explosion-proof valve 100 can be centrally arranged between the two large surfaces 230. Such a design can ensure that the two edges of the explosion-proof valve 100 close to the large surface 230 are balanced, thereby ensuring the installation stability of the explosion-proof valve 100. Moreover, such a design can increase the installation area of ​​the explosion-proof valve 100 to a greater extent when the thickness of the first side surface 210 and the second side surface 220 is limited.

[0050] In order to improve the pressure relief effect of the battery, in addition to forming an explosion-proof valve 100 on the first side surface 210, refer to Figure 2 , Figure 4 , Figure 7-Figure 9In some other embodiments, at least one explosion-proof valve 100 may be arranged on the second side 220. By arranging the explosion-proof valve 100 on the second side 220, when thermal failure occurs at a position of the battery close to the second side 220, high-temperature and high-pressure gas and liquid substances can be discharged in time through the explosion-proof valve 100 on the second side 220.

[0051] Reference Figure 3-Figure 6 In some embodiments, the pole 300 of the battery can be arranged on the first side 210, and at least one explosion-proof valve 100 can be arranged on the second side 220. Alternatively, the pole 300 of the battery can be arranged on the second side 220, and at least one explosion-proof valve 100 can be arranged on the first side 210. In this design, the pole 300 and the explosion-proof valve 100 are arranged on different sides, respectively, so that the pole 300 and the explosion-proof valve 100 can be prevented from occupying each other's layout space, thereby making it more convenient to layout the pole 300 and the explosion-proof valve 100.

[0052] The present disclosure does not limit how the explosion-proof valve 100 is formed on the battery. For example, in some embodiments, the battery may include a housing 200, and the explosion-proof valve 100 may be integrally stamped with the housing 200. Alternatively, in some other embodiments, the explosion-proof valve 100 may be welded to the housing 200.

[0053] Second embodiment

[0054] Reference Figure 2-Figure 9 , this embodiment exemplarily shows a battery, the battery has a length L, a thickness D, a height H and a volume V, and satisfies L>D, L>H, 300mm≤L≤2000mm, wherein the length L corresponds to the X-direction dimension in the figure, the thickness D corresponds to the Y-direction dimension in the figure, the height H corresponds to the Z-direction dimension in the figure, and L can be 300mm, 1200mm, 2000mm, etc. The battery includes at least one explosion-proof valve 100, which can be 1, 2, 3, etc. The explosion-proof valve 100 is arranged on the side adjacent to the large surface 230 of the battery, and the distance between the edge of the explosion-proof valve 100 close to the large surface 230 and the large surface 230 is D1 and satisfies D1≥1mm. Here, the "large surface 230" refers to the wall with the largest area of ​​the battery, that is, the wall formed by the long side and the high side mentioned below; the side adjacent to the large surface 230 refers to the other wall of the battery except the large surface 230, such as the first side and the second side mentioned below. The area S and volume V of the explosion-proof valve 100 satisfy the relationship V: S = 1500-8000 (mm). Here, the area S of the explosion-proof valve 100 refers to the sum of the areas of at least one explosion-proof valve 100. The area refers to the cross-sectional area of ​​the portion of the explosion-proof valve 100 used for exhaust, that is, the opening area, which is used to indicate the exhaust capacity of the explosion-proof valve 100.

[0055] In the embodiments of the present disclosure, V:S may be 1500 mm, 5000 mm, 8000 mm, etc.

[0056] In addition, the present disclosure does not limit the type of battery, for example, it can be a long battery, a blade battery, etc.

[0057] It should be explained that the working principle of the explosion-proof valve 100 is that when thermal runaway occurs inside the battery and causes the internal pressure or temperature to be greater than the opening threshold of the explosion-proof valve 100, the valve core of the explosion-proof valve 100 can be opened to exhaust, release pressure and cool down.

[0058] By using the above technical solution, D1≥1mm can ensure that the edge of the explosion-proof valve and the large surface of the battery meet a certain distance, avoid the explosion-proof valve being too close to the large surface, and prevent the large surface of the battery from expanding during normal operation, causing stress concentration at the explosion-proof valve, so as to ensure the reliability of the explosion-proof valve when the battery is working, and at the same time ensure the welding reliability between the explosion-proof valve and the battery shell; the volume V of the battery is a constant value, and the lower limit value of S can ensure that when the battery fails thermally, the explosion-proof valve can quickly discharge the high-temperature and high-pressure gas and liquid substances in the battery to meet the pressure relief requirements; the upper limit value of S is to avoid the area of ​​the explosion-proof valve being too large, which makes it difficult for the valve core of the explosion-proof valve to reach the opening threshold, and causes a large opening error and failure to open in time.

[0059] Reference Figure 2-Figure 9 In the embodiment of the present disclosure, the battery may have a plurality of explosion-proof valves 100 arranged along the length direction of the battery. Such a design can ensure that when a thermal failure occurs at any position of the battery, there is a relatively close explosion-proof valve 100, so that high-temperature and high-pressure gas and liquid substances can be discharged in time through a relatively short exhaust path.

[0060] To facilitate the following description, the various sides of the battery are named here, refer to Figure 2-Figure 9 In some embodiments, the battery can be constructed as a rectangular parallelepiped structure having a long side 201, a high side 202, and a thick side 203. The long side 201 and the thick side 203 can form a first side surface 210, the high side 202 and the thick side 203 can form a second side surface 220, and the high side 202 and the long side 201 can form a large surface 230. The first side surface 210, the second side surface 220, and the large surface 230 will not be explained below. Of course, the present disclosure does not limit the structure of the battery to Figure 2-Figure 9 The rectangular parallelepiped structure shown is only for illustrative purposes.

[0061] Reference Figure 2-Figure 9In some embodiments, the distance between the edge of the explosion-proof valve 100 close to the side and the side is L1 and satisfies L1>100mm. Specifically, when the explosion-proof valve 100 is located on the first side 210, L1 refers to the distance between the edge of the explosion-proof valve 100 close to the second side 220 and the second side 220; when the explosion-proof valve 100 is located on the second side 220, L1 refers to the distance between the edge of the explosion-proof valve 100 close to the first side 210 and the first side 210. Such a design is more conducive to using fewer explosion-proof valves 100 to meet the pressure relief requirements of the battery. Specifically, this is because when L1<100mm, that is, the explosion-proof valve 100 is close to the side, so that more explosion-proof valves 100 need to be arranged at a position greater than 100mm away from the side to meet the pressure relief requirements, especially when the side itself has an explosion-proof valve 100, the explosion-proof valve 100 is arranged at a position close to the side, which will lead to a waste of explosion-proof valves 100. On the contrary, when the explosion-proof valve 100 satisfies L1>100mm, the explosion-proof valve 100 closest to the side can protect both the portion of the battery close to the side and the other portion away from the side, thereby maximizing the protection range of the explosion-proof valve 100.

[0062] Reference Figure 10-11 In some embodiments, the distance D1 between the edge of the explosion-proof valve 100 close to the large surface 230 and the large surface 230 can satisfy D1<D / 2, where D is the thickness of the battery. In this way, D1 is designed to be less than D / 2. In this way, when the thickness D of the battery is constant, when D1<D / 2, it can be ensured that the side surface adjacent to the large surface 230 (such as the first side surface 210 and the second side surface 220) can have enough space to arrange the explosion-proof valve 100, that is, the size (exhaust area) of the explosion-proof valve 100 can be guaranteed, thereby ensuring the safety of the battery.

[0063] The present disclosure does not limit the thickness D of the battery. For example, in the embodiments of the present disclosure, D may satisfy 13 mm ≤ D ≤ 30 mm. D may specifically be 13 mm, 22 mm, 30 mm, etc.

[0064] Reference Figure 2-Figure 9 In some embodiments, the explosion-proof valve 100 can be centrally arranged between the two large surfaces 230. Such a design can ensure that the two edges of the explosion-proof valve 100 close to the large surface 230 are balanced, thereby ensuring the installation stability of the explosion-proof valve 100. And such a design can increase the installation area of ​​the explosion-proof valve 100 to a greater extent when the thickness of the battery is limited.

[0065] Reference Figure 3-Figure 6In some embodiments, the pole 300 of the battery can be arranged on the first side 210, and at least one explosion-proof valve 100 can be arranged on the second side 220. Alternatively, the pole 300 of the battery can be arranged on the second side 220, and at least one explosion-proof valve 100 can be arranged on the first side 210. In this design, the pole 300 and the explosion-proof valve 100 are arranged on different sides, respectively, so that the pole 300 and the explosion-proof valve 100 can be prevented from occupying each other's layout space, thereby making it more convenient to layout the pole 300 and the explosion-proof valve 100.

[0066] In some embodiments, the battery capacity C may satisfy: 50Ah≤C≤300Ah, and the area S of the explosion-proof valve 100 and the battery capacity C may satisfy the relationship C: S=0.1-1.5 (Ah / mm 2 Here, the area S refers to the sum of the opening areas of all explosion-proof valves 100. It should be noted that the battery can simultaneously meet C: S = 0.1 ~ 1.5 (Ah / mm 2 ) and V: S=1500~8000(mm).

[0067] The present disclosure does not limit how the explosion-proof valve 100 is formed on the battery. For example, in some embodiments, the battery may include a housing 200, and the explosion-proof valve 100 may be integrally stamped with the housing 200. Alternatively, in some other embodiments, the explosion-proof valve 100 may be welded to the housing 200.

[0068] 2. Installation location and quantity of explosion-proof valves

[0069] Reference Figure 2-Figure 9, the present disclosure exemplarily shows a battery, the battery has a length L, a thickness D, a height H and a volume V, and satisfies L>D, L>H, 300mm≤L≤2000mm, 13mm≤D≤30mm, wherein the length L corresponds to the X-direction dimension in the figure, the thickness D corresponds to the Y-direction dimension in the figure, and the height H corresponds to the Z-direction dimension in the figure. L can be 300mm, 1200mm, 2000mm, etc., and D can be 13mm, 22mm, 30mm, etc. The battery includes at least one explosion-proof valve 100, which can be 1, 2, 3, etc. The explosion-proof valve 100 is provided on the side adjacent to the large surface 230 of the battery, and the distance between the edge of the explosion-proof valve 100 close to the large surface 230 and the large surface 230 is D1 and satisfies D1≥1mm, for example, 1mm, 2mm, etc. The "large surface 230" here refers to the wall surface with the largest area of ​​the battery, that is, the wall surface formed by the long side and the high side mentioned below; the side surface adjacent to the large surface 230 refers to the other wall surfaces of the battery other than the large surface 230, such as the first side surface and the second side surface mentioned below. The width of the explosion-proof valve 100 is D2 and satisfies 1mm≤D2<D / 2. The "width" here refers to the size of the explosion-proof valve 100 in the thickness direction. The distance between the edge of the explosion-proof valve 100 close to the side surface and the side surface is L1 and satisfies L1>100mm, such as 110mm, 150mm, etc., as long as it satisfies that when thermal failure occurs at any position of the battery, there is an explosion-proof valve 100 that can quickly discharge high-temperature and high-pressure gas and liquid substances. Specifically, when the explosion-proof valve 100 is located on the first side, L1 refers to the distance between the edge of the explosion-proof valve 100 close to the second side and the second side; when the explosion-proof valve 100 is located on the second side, L1 refers to the distance between the edge of the explosion-proof valve 100 close to the first side and the first side.

[0070] In addition, the present disclosure does not limit the type of battery, for example, it can be a long battery, a blade battery, etc.

[0071] By using the above technical solution, D1≥1mm can ensure that the edge of the explosion-proof valve and the large surface of the battery meet a certain distance, avoid the explosion-proof valve 100 from being too close to the large surface 230, and prevent the large surface 230 from expanding when the battery is working normally, causing stress concentration at the explosion-proof valve 100, so as to ensure the reliability of the explosion-proof valve 100 when the battery is working, and at the same time ensure the welding reliability between the explosion-proof valve 100 and the battery shell; 1mm≤D2<D / 2 can ensure that the explosion-proof valve 100 has a predetermined exhaust area to meet the required pressure relief requirements, and at the same time will not affect the strength of the battery shell due to the excessive size of the explosion-proof valve 100 ; L1>100mm means that when the battery length is constant, there is no need to arrange too many explosion-proof valves, which is more conducive to using fewer explosion-proof valves 100 to meet the pressure relief needs of the battery and meet the requirements of the manufacturing process. This is because when L1<100mm, that is, the explosion-proof valve 100 is close to the side, which will result in the need to arrange more explosion-proof valves 100 at a position greater than 100mm away from the side to meet the pressure relief needs. Especially when the side itself has an explosion-proof valve 100, arranging an additional explosion-proof valve 100 at a position close to the side will result in a waste of explosion-proof valves 100. On the contrary, when the explosion-proof valve 100 satisfies L1>100mm, the explosion-proof valve 100 closest to the side can protect the part of the battery close to the side and the other part away from the side, thereby maximizing the protection range of the explosion-proof valve 100.

[0072] See also Figure 1 At present, an explosion-proof valve 100 is usually arranged near one side of the battery. However, for batteries with large capacity and long length, a single explosion-proof valve 100 is difficult to meet the requirements of rapid pressure relief. For example, when the battery is long, its internal exhaust path is correspondingly long. When the battery has thermal runaway, the gas needs to pass through a long path to reach the explosion-proof valve for discharge. Especially when the thermal runaway occurs at the farthest end from the explosion-proof valve, the gas needs to flow through the entire battery to be discharged, which is not conducive to the discharge of high-temperature gas and liquid substances inside the battery during thermal runaway. To address this issue, refer to Figure 2-Figure 9 In the embodiment shown in the present disclosure, the battery may have a plurality of explosion-proof valves 100 arranged along the length direction, and at least one explosion-proof valve 100 is provided in each L / 2 section from one end to the other end in the length direction. In other words, the battery is divided into two parts in the length direction, wherein each part is provided with at least one explosion-proof valve 100, such as one, two, three, etc., which can be specifically designed comprehensively according to the exhaust capacity of the explosion-proof valve 100 and the length and capacity of the battery.

[0073] It needs to be explained that, referring to Figure 3, an explosion-proof valve 100 may be provided in the middle of the length direction of the battery, that is, the explosion-proof valve 100 is located at the junction of two L / 2 sections. In this case, it can be considered as an explosion-proof valve 100 on any L / 2 section, and the battery at this time has at least another explosion-proof valve 100. Moreover, in the embodiment shown in the present disclosure, the left side of the battery (the second side mentioned below) and the lower side of the battery (the first side mentioned below) are hidden and cannot be shown, and in fact, at least one explosion-proof valve 100 may also be provided respectively, and the present disclosure does not limit this. With such a design, at least one explosion-proof valve 100 is arranged in each L / 2 section from one end to the other end in the length direction of the battery. Therefore, when thermal runaway occurs at any position of the battery, the high-temperature and high-pressure gas and liquid substances can be quickly discharged through the explosion-proof valve 100 close to the thermal runaway position through a shorter exhaust path, thereby reducing the exhaust time, improving the exhaust efficiency, and avoiding the situation where the thermal failure position is far away from the explosion-proof valve 100 and the exhaust path is long (for example, it is necessary to flow from one end to the other end in the length direction of the battery), resulting in the accumulation of high-temperature and high-pressure gas and liquid substances in the battery, causing the internal pressure and temperature of the battery to rise sharply, further leading to problems such as battery shell rupture and battery fire.

[0074] In order to further improve the exhaust efficiency, in the embodiment of the present disclosure, at least one explosion-proof valve 100 may be provided in each L / 3 section from one end to the other end in the length direction. Similar to the above, here it means that the battery is divided into three parts in the length direction, and at least one explosion-proof valve 100 is provided in each part. For example, referring to Figure 2 In this case, when any of point A, point B and point C fails thermally, the high-temperature and high-pressure gas and liquid substances can be quickly discharged through the nearby explosion-proof valve 100.

[0075] In order to further improve the exhaust efficiency, in the embodiment of the present disclosure, at least one explosion-proof valve 100 may be provided in each L / 5 section from one end to the other end in the length direction. Similar to the above, here it means that the battery is divided into five parts in the length direction, and at least one explosion-proof valve 100 is provided in each part.

[0076] The present disclosure does not limit the specific installation positions of the plurality of explosion-proof valves 100. Figure 2-Figure 9In some embodiments, the battery can be constructed as a rectangular parallelepiped structure having a long side 201, a high side 202 and a thick side 203, the long side 201 and the thick side 203 can form a first side 210, the high side 202 and the thick side 203 can form a second side 220, and the explosion-proof valve 100 can be arranged on the first side 210 or the second side 220. In addition, in some other embodiments, the explosion-proof valve 100 can also be arranged on the first side 210 and the second side 220. It should be noted that the first side 210 and the second side 220 are two and arranged oppositely. In addition, it should be explained that the long side 201 and the high side 202 can form two large surfaces 230, which will expand and contract when the battery is used, so installing the explosion-proof valve 100 on the large surface will cause the installation position of the explosion-proof valve 100 to be repeatedly stressed, easy to loosen, fall off, etc., so installing the explosion-proof valve 100 on the first side 210 and the second side 220 can avoid this problem.

[0077] Reference Figure 3-Figure 6 In some embodiments, at least one explosion-proof valve 100 may be disposed on the same first side 210 or the same second side 220. With such a design, when a plurality of batteries are assembled into a battery pack and installed in an electrical device, the first side 210 or the second side 220 on which the explosion-proof valve 100 is installed may be directed toward the side of the high-voltage wiring harness of the battery pack away from the battery pack, so that when thermal runaway occurs in the battery, the high-temperature gas inside is discharged from the explosion-proof valve 100 without damaging the high-voltage wiring harness of the battery pack, thereby reducing the risk of high-voltage arcing in the battery pack and improving the safety of the battery pack.

[0078] Reference Figure 3-Figure 6 In some embodiments, the pole 300 of the battery can be arranged on the first side 210, and at least one explosion-proof valve 100 can be arranged on the second side 220. Alternatively, the pole 300 of the battery can be arranged on the second side 220, and at least one explosion-proof valve 100 can be arranged on the first side 210. In this design, the pole 300 and the explosion-proof valve 100 are arranged on different sides, respectively, so that the pole 300 and the explosion-proof valve 100 can be prevented from occupying each other's layout space, thereby making it more convenient to layout the pole 300 and the explosion-proof valve 100.

[0079] Reference Figure 2-Figure 9 In some embodiments, the explosion-proof valve 100 can be centrally arranged between the two large surfaces 230. Such a design can ensure that the two edges of the explosion-proof valve 100 close to the large surface 230 are balanced, thereby ensuring the installation stability of the explosion-proof valve 100. Moreover, such a design can increase the installation area of ​​the explosion-proof valve 100 to a greater extent when the thickness of the first side surface 210 and the second side surface 220 is limited.

[0080] The present disclosure does not limit the specific shape of the explosion-proof valve 100. For example, in the embodiments of the present disclosure, the cross-section of the explosion-proof valve 100 may be runway-shaped (i.e., waist-shaped). In addition, in some other embodiments, the cross-section of the explosion-proof valve 100 may also be circular. It should be explained that the cross-section here refers to the cross-section of the gas release channel of the explosion-proof valve 100. It should be explained that the explosion-proof valve 100 with a circular or runway-shaped cross-section can better withstand high pressure (it is easier to evenly distribute pressure and release it), while shapes such as square or rectangular are prone to stress accumulation, causing the explosion-proof valve to fail or break.

[0081] Reference Figure 2-Figure 9 In an embodiment of the present disclosure, on the same first side 210, at least one explosion-proof valve 100 can be arranged symmetrically about the center of the length direction. Or on the same second side 220, at least one explosion-proof valve 100 can be arranged symmetrically about the center of the width direction of the battery. Alternatively, on the same first side 210, at least one explosion-proof valve 100 can be arranged symmetrically about the center of the length direction, and on the same second side 220, at least one explosion-proof valve 100 can be arranged symmetrically about the center of the width direction of the battery. Such a design is more conducive to the layout of the explosion-proof valves 100 on the first side 210 and the second side 220, so that the exhaust requirements can be met with fewer explosion-proof valves 100. And this symmetrical design is more conducive to the use intensity of the battery and improves the service life.

[0082] In some embodiments, the first side 210 may be provided with one or two explosion-proof valves 100 in the length direction of the battery, where 300mm≤L≤600mm. In addition, in some other embodiments, the first side 210 may be provided with at least three explosion-proof valves 100 in the length direction of the battery, where 600mm<L≤2000mm. The longer the battery is, the more explosion-proof valves 100 are provided in the length direction, so that when failure occurs at any position of the battery, pressure relief can be performed through a closer explosion-proof valve 100.

[0083] The present disclosure does not limit how the explosion-proof valve 100 is formed on the battery. For example, in some embodiments, the battery may include a housing 200, and the explosion-proof valve 100 may be integrally stamped with the housing 200. Alternatively, in some other embodiments, the explosion-proof valve 100 may be welded to the housing 200.

[0084] According to a second aspect of the present disclosure, there is provided a battery pack, comprising the above-mentioned battery. Since the battery pack has all the beneficial effects of the above-mentioned battery, they are not described in detail here.

[0085] According to a third aspect of the present disclosure, there is provided an electrical device, comprising the above-mentioned battery pack. Since the electrical device has all the beneficial effects of the above-mentioned battery pack, they are not described in detail here.

[0086] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0087] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0088] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A battery, characterized in that: The battery has a length L, a thickness D, and a height H and satisfies L>D, L>H, and 300mm≤L≤2000mm; the battery includes at least one explosion-proof valve, the explosion-proof valve is arranged on the side adjacent to the large surface of the battery, and the distance between the edge of the explosion-proof valve close to the large surface and the large surface is D1 and satisfies 1mm≤D1<D / 2; the total area of ​​the at least one explosion-proof valve is S; the battery capacity C satisfies: 50Ah≤C≤300Ah, and the total area S of the at least one explosion-proof valve and the battery capacity C satisfy the relationship C: S=0.1~1.5(Ah / mm 2 ).

2. The battery according to claim 1, characterized in that The battery is constructed as a rectangular parallelepiped structure having a long side, a high side and a thick side, wherein the long side and the thick side form a first side surface, and at least one explosion-proof valve is arranged on the first side surface.

3. The battery according to claim 2, characterized in that The first side surface is provided with one or two explosion-proof valves in the length direction of the battery, wherein 300mm≤L≤600mm.

4. The battery according to claim 2, characterized in that At least three explosion-proof valves are provided on the first side surface in the length direction of the battery, wherein 600mm<L≤2000mm.

5. The battery according to claim 3 or 4, characterized in that: The high side and the thick side form a second side surface, wherein a distance L1 between the explosion-proof valve located on the first side surface and the second side surface satisfies L1>100 mm.

6. The battery according to claim 1, characterized in that The explosion-proof valve is centrally arranged between the two large surfaces.

7. The battery according to claim 2, characterized in that The high side and the thick side form a second side surface, and at least one explosion-proof valve is arranged on the second side surface.

8. The battery according to claim 1, characterized in that The battery is constructed as a rectangular parallelepiped structure having a long side, a high side and a thick side, wherein the long side and the thick side form a first side surface, and the high side and the thick side form a second side surface. The battery pole is arranged on the first side, and the at least one explosion-proof valve is entirely arranged on the second side; or the battery pole is arranged on the second side, and the at least one explosion-proof valve is entirely arranged on the first side.

9. The battery according to claim 1, characterized in that Including housing, The explosion-proof valve and the housing are integrally stamped, or the explosion-proof valve and the housing are connected by welding.

10. A battery pack, characterized in that: A battery comprising a plurality of batteries according to any one of claims 1 to 9.

11. An electrical device, characterized in that: A battery pack comprising the battery pack described in claim 10.

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