Battery, battery pack and electrical device

Abstract

The present disclosure relates to a battery, a battery pack, and an electrical device. The battery has a length L, a thickness D and a height H, which satisfy L>D, L>H, and 300 mm≤L≤2000 mm. The battery comprises at least one explosion-proof valve. The explosion-proof valve is arranged on a side face adjacent to a large surface of the battery, and the distance D1 between the edge of the explosion-proof valve and the large surface satisfies 1 mm≤D1≤D / 2; the total area of the explosion-proof valve is defined as S; and the capacity C of the battery satisfies: 50 Ah≤C≤300 Ah, and S and C satisfy the relationship expression: C:S=0.1-1.5 (Ah / mm2).

Description

Battery, battery pack and electric device

[0001] The present disclosure claims priority to the Chinese patent application No. 202420778943.6, filed on April 15, 2024, and entitled "Battery, battery pack and electric device", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of batteries, in particular to a battery, a battery pack and an electric device. BACKGROUND

[0003] The battery needs to consider the thermal safety problem during use, so the battery usually needs to be designed with a pressure relief valve to meet the requirement that the battery can be pressure released when thermal runaway occurs, so as to prevent the safety problem of fire and explosion caused by excessive internal pressure and temperature of the battery. The cross-sectional area of the exhaust part of the pressure relief valve determines the exhaust efficiency of the pressure relief valve. In the prior art, two problems are prone to occur when the pressure relief valve is designed. First, the cross-sectional area of the exhaust part of the pressure relief valve is small, which cannot quickly and timely discharge high-temperature and high-pressure gas-liquid substances. Second, the cross-sectional area of the exhaust part of the pressure relief valve is large, which makes it difficult to open the pressure relief valve (high threshold value), and there is a large opening error, which is prone to the problem that the internal pressure of the battery reaches the threshold value but the pressure relief valve does not open. SUMMARY

[0004] The purpose of the present disclosure is to provide a battery, a battery pack and an electric device to at least partially solve the problems in the related art.

[0005] In order to achieve the above-mentioned purpose, the present disclosure provides a battery, the battery has a length L, a thickness D, a height H and satisfies L>D, L>H, 300mm≤L≤2000mm; the battery comprises at least one pressure relief valve, the pressure relief valve is arranged on a side surface adjacent to a large surface of the battery, and the edge of the pressure relief valve close to the large surface and the large surface has a spacing D1 and satisfies 1mm≤D1<D / 2; the total area of the at least one pressure relief valve is S; the battery capacity C satisfies 50Ah≤C≤300Ah, and the total area S of the at least one pressure relief valve and the battery capacity C satisfy the relationship C:S=0.1-1.5(Ah / mm 2 ).

[0006] Optionally, the battery is configured as a cuboid structure with a long side, a high side and a thick side, the long side and the thick side form a first side surface, and at least one pressure relief valve is arranged on the first side surface.

[0007] Optionally, the first side is provided with one or two explosion-proof valves in the length direction of the battery, wherein 300mm≤L≤600mm.

[0008] Optionally, the first side is provided with at least three explosion-proof valves in the length direction of the battery, wherein 600mm

[0009] Optionally, the high edge and the thick edge form a second side, wherein the distance L1 between the explosion-proof valve on the first side and the second side satisfies L1>100mm.

[0010] Optionally, the explosion-proof valve is arranged centrally between two large faces.

[0011] Optionally, the high edge and the thick edge form a second side, wherein at least one explosion-proof valve is arranged on the second side.

[0012] Optionally, the battery is configured as a cuboid structure with a long edge, a high edge and a thick edge, the long edge and the thick edge form a first side, and the high edge and the thick edge form a second side, wherein the pole of the battery is arranged on the first side, and all the at least one explosion-proof valve is arranged on the second side; or the pole of the battery is arranged on the second side, and all the at least one explosion-proof valve is arranged on the first side.

[0013] Optionally, a shell is included, and the explosion-proof valve is integrally stamped with the shell, or the explosion-proof valve is welded to the shell.

[0014] According to a second aspect of the present disclosure, a battery pack is provided, comprising the above-mentioned battery.

[0015] According to a third aspect of the present disclosure, a power consumption device is provided, comprising the above-mentioned battery pack.

[0016] Through the above technical solution, 1mm≤D1 can keep a certain distance between the explosion-proof valve and the large face, prevent the large face from expanding to cause stress concentration at the explosion-proof valve when the battery is working normally, improve the reliability of the explosion-proof valve, and at the same time ensure that a certain distance is conducive to the welding reliability between the explosion-proof valve and the battery shell; D1

[0017] Other features and advantages of the present disclosure will be made clear in the following detailed description of the embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, which together with the detailed description, serve to explain the present disclosure. In the drawings:

[0019] FIG. 1 is a schematic diagram of a battery according to an example of the present disclosure;

[0020] FIG. 2 is a schematic diagram of a battery according to an example of the present disclosure;

[0021] FIG. 3 is a schematic diagram of another battery according to an example of the present disclosure;

[0022] FIG. 4 is a schematic diagram of another battery according to an example of the present disclosure;

[0023] FIG. 5 is a schematic diagram of another battery according to an example of the present disclosure;

[0024] FIG. 6 is a schematic diagram of another battery according to an example of the present disclosure;

[0025] FIG. 7 is a schematic diagram of another battery according to an example of the present disclosure;

[0026] FIG. 8 is a schematic diagram of another battery according to an example of the present disclosure;

[0027] FIG. 9 is a schematic diagram of another battery according to an example of the present disclosure;

[0028] FIG. 10 is a top view of a first side of a battery according to an example of the present disclosure;

[0029] FIG. 11 is a partial enlarged view of portion D in FIG. 10;

[0030] FIG. 12 is a schematic diagram of a connection structure of a battery and a battery pack according to an example of the present disclosure;

[0031] FIG. 13 is a schematic diagram of a connection structure of a battery pack and an electrical device according to an example of the present disclosure. DETAILED DESCRIPTION

[0032] The detailed description of the present disclosure will be described below with reference to the accompanying drawings. It should be understood that the detailed description described herein is merely intended to illustrate and explain the present disclosure, and is not intended to limit the present disclosure.

[0033] In the present disclosure, the orientation words such as "upper", "lower", "left", "right" used without the opposite description are based on the drawing plane direction, for example: the "left" side of the battery and the "lower" side of the battery cannot be shown due to concealment, where the "left" side refers to the side of the battery close to the left side in the relevant drawing plane; the "lower" side refers to the side of the battery close to the lower side in the drawing plane.

[0034] In the present disclosure, the terms "first", "second" and the like are used to distinguish one element from another element, and do not have sequential and important meanings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0035] For the convenience of understanding the technical solutions of the present disclosure, it needs to be introduced that in the use process of the battery, the thermal safety problem needs to be considered, therefore the battery is usually designed with a pressure relief 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, causing the shell to break and the battery to catch fire, explode and other safety problems. Among them, the structure of the pressure relief valve includes the following main components: ① safety cover: a structure located above the battery, usually made of metal or plastic, used to protect the internal components and fix the position of other components; ② pressure sensing device: usually a thin film or spring, used to sense changes in internal pressure of the battery; ③ pressure release channel: a channel connecting the inside and outside of the battery, used to release excess internal pressure. Its main function is: when the internal pressure or temperature of the battery exceeds the safe range, the pressure relief valve will automatically open to release excess gas or liquid, reduce the pressure and temperature to prevent the battery from exploding, thermal rupture, etc. The technical solutions of the present disclosure are based on the above basic background to improve the number, arrangement position, structure, size and other elements of the battery pressure relief valve, so that the pressure relief valve can meet the corresponding protection function, see the following text. It should be noted that the battery introduced in the present disclosure can be used alone or composed of multiple batteries to form a battery pack.

[0036] The following will introduce various embodiments from different aspects, but it needs to be pointed out that there is some repeated content in the embodiments, and the different parts in these embodiments can be combined with each other without contradiction.

[0037] First of all, it should be pointed out that the size of the battery mentioned here refers to the overall external size of the battery, that is, the thickness, height, length, volume and other parameters of the battery are based on the shell, that is, the length of the battery refers to the length of the shell, the thickness of the battery refers to the thickness of the shell, and this point will not be described again in the following. In addition, the length direction, height direction and thickness direction are defined based on the usual sense of direction of the sheet-shaped battery, the length direction refers to the extension direction of the longest side, and the thickness direction usually refers to the extension direction of the shortest side.

[0038] After understanding the foregoing basic situation, the following will start to introduce in detail for different embodiments.

[0039] I. Cross-sectional area of explosion-proof valve (cross-sectional area of the gas release passage of the explosion-proof valve, i.e. opening area)

[0040] First embodiment:

[0041] Referring to FIGS. 2-9, in this embodiment, a battery is provided, the battery 10 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 size in the figure, the thickness D corresponds to the Y direction size in the figure, the height H corresponds to the Z direction size in the figure, and L can be 300mm, 1200mm, 2000mm, etc.; the battery pack 20 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 surface adjacent to the large surface 230 of the battery 10, and the edge of the explosion-proof valve 100 close to the large surface 230 is spaced apart from the large surface 230 by a distance D1 and satisfies 1mm≤D1<D / 2, where the "large surface 230" refers to the wall surface with the largest area of the battery 10, i.e. the wall surface formed by the long side and the high side to be mentioned below; the side surface adjacent to the large surface 230 refers to other wall surfaces of the battery 10 other than the large surface 230, such as the first side surface and the second side surface to be mentioned below. The total area of the at least one explosion-proof valve 100 is S, and the capacity C of the battery 10 satisfies 50Ah≤C≤300Ah, and the total area S of the at least one explosion-proof valve 100 and the capacity C of the battery 10 satisfy the relationship C:S=0.1-1.5(Ah / mm 2 ). It needs to be explained that the cross-sectional area here refers to the cross-sectional area of the part of the explosion-proof valve 100 for exhaust, i.e. the opening area, which is used to represent the exhaust capacity of the explosion-proof valve 100.

[0042] In the embodiments of the present disclosure, C:S can be 0.1Ah / mm 2 , 1Ah / mm 2 , 1.5Ah / mm 2 , etc.

[0043] In addition, the present disclosure does not limit the type of battery 10, which can be a long battery, a blade battery, etc.

[0044] It needs to be explained that the working principle of the explosion-proof valve 100 is that when the internal pressure or temperature of the battery 10 exceeds the opening threshold of the explosion-proof valve 100 due to thermal runaway inside the battery 10, the valve core of the explosion-proof valve 100 can be opened to exhaust, depressurize and cool down.

[0045] By using the above technical solutions, 1mm≤D1 can keep the explosion-proof valve 100 at a distance from the large face 230, prevent the large face 230 from expanding to cause stress concentration at the explosion-proof valve 100 when the battery 10 is working normally, improve the reliability of the explosion-proof valve 100, and at the same time ensure that a certain distance is conducive to the welding reliability between the explosion-proof valve 100 and the battery 10 shell; D1<D / 2 can ensure that the side of the battery 10 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, and to ensure the safety of the battery 10. Since C is a constant, the lower limit of S can ensure that the area of the explosion-proof valve 100 meets the requirement that the battery 10 can quickly discharge the internal high-temperature and high-pressure gas-liquid material when it fails, and meets the exhaust efficiency; the upper limit of S is to avoid the area of the explosion-proof valve 100 being too large, to avoid the valve core not being easy to reach the opening threshold, and to cause a large opening error and a problem of not being able to open in time.

[0046] For the convenience of the following description, the various sides of the battery 10 are named here. Referring to FIGS. 2-9, in some embodiments, the battery 10 can be configured as a cuboid 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 high side 202 and the long side 201 can form a large face 230. The following description of the first side 210, the second side 220, and the large face 230 will not be explained. Of course, the present disclosure does not limit the structure of the battery 10 to be the cuboid structure shown in FIGS. 2-9, and the cuboid structure is only an exemplary illustration.

[0047] Referring to FIGS. 2-3 and 5-9, in some embodiments, at least one explosion-proof valve 100 can be arranged on the first side 210. In this way, compared with arranging the explosion-proof valve 100 only on one second side 220, the explosion-proof valve 100 located on the first side 210 is closer to the exhaust path of any position of the battery 10 than the length of the battery 10, so that when any position of the battery 10 fails, it can quickly relieve pressure 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, which can be one, two, three, etc. The specific design can be adapted according to the length of the battery 10.

[0048] Specifically, in some embodiments, the first side surface 210 can be provided with one or two explosion-proof valves 100 in the length direction of the battery 10, where 300mm≤L≤600mm. In addition, in other embodiments, the first side surface 210 can be provided with at least three explosion-proof valves 100 in the length direction of the battery 10, where 600mm<L≤2000mm. The greater the length of the battery 10, the more explosion-proof valves 100 are provided in the length direction, so that when failure occurs at any position of the battery 10, pressure relief can be achieved through a closer explosion-proof valve 100.

[0049] In some embodiments, the distance L1 between the explosion-proof valve 100 on the first side surface 210 and the second side surface 220 can satisfy L1>100mm. Such a design is more conducive to meeting the pressure relief requirements of the battery 10 with fewer explosion-proof valves 100. Specifically, when L1<100mm, the explosion-proof valve 100 closest to the second side surface 220 is closer to the second side surface 220, which will result in the need for additional explosion-proof valves 100 to be arranged at a position more than 100mm away from the second side surface 220 to meet the pressure relief requirements. In particular, when the second side surface 220 has an explosion-proof valve 100, additional explosion-proof valves 100 arranged at a position closer to the second side surface 220 on the first side surface 210 will result in a waste of explosion-proof valves 100. Conversely, when the explosion-proof valve 100 satisfies L1>100mm, the explosion-proof valve 100 closest to the second side surface 220 can protect both the part of the battery 10 close to the second side surface 220 and the other part away from the second side surface 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 10, an explosion-proof valve 100 can quickly discharge high-temperature and high-pressure gas-liquid substances.

[0050] Referring to FIGS. 2-9, in some embodiments, the explosion-proof valve 100 can be arranged centrally 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 surfaces 230 are balanced in stress, 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.

[0051] To improve the pressure relief effect of the battery 10, in addition to forming the explosion-proof valve 100 on the first side surface 210, referring to FIGS. 2, 4, 7-9, in some other embodiments, at least one explosion-proof valve 100 can be arranged on the second side surface 220. By arranging the explosion-proof valve 100 on the second side surface 220, the high-temperature and high-pressure gas-liquid substance can be discharged in time through the explosion-proof valve 100 on the second side surface 220 when thermal failure occurs near the second side surface 220 of the battery 10.

[0052] Referring to FIGS. 3-6, in some embodiments, the pole 300 of the battery 10 can be arranged on the first side surface 210, and the at least one explosion-proof valve 100 can be arranged on the second side surface 220. Alternatively, the pole 300 of the battery 10 can be arranged on the second side surface 220, and the at least one explosion-proof valve 100 can be arranged on the first side surface 210. In this way, arranging the pole 300 and the explosion-proof valve 100 on different side surfaces can avoid occupying each other's arrangement space, thereby facilitating the layout of the pole 300 and the explosion-proof valve 100.

[0053] The present disclosure does not limit how the explosion-proof valve 100 is formed on the battery 10. For example, in some embodiments, the battery 10 can include a shell 200, and the explosion-proof valve 100 can be integrally punched and formed with the shell 200. Alternatively, in some other embodiments, the explosion-proof valve 100 can be welded to the shell 200.

[0054] Second Embodiment

[0055] Referring to FIGS. 2-9, the present embodiment exemplarily shows a battery 10 having a length L, a thickness D, a height H, and a volume V, and satisfying 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 the length L can be 300mm, 1200mm, 2000mm, etc. The battery pack 20 includes at least one explosion-proof valve 100, which can be 1, 2, 3, etc. The explosion-proof valve 100 is arranged on a side surface adjacent to a large surface 230 of the battery 10, and the edge of the explosion-proof valve 100 close to the large surface 230 is spaced apart from the large surface 230 by a distance D1 and satisfies D1≥1mm. Here, the "large surface 230" refers to the wall surface of the battery 10 with the largest area, i.e., the wall surface formed by the long side and the high side to be mentioned below; and the side surface adjacent to the large surface 230 refers to the wall surface of the battery 10 other than the large surface 230, such as the first side surface and the second side surface to be mentioned below. The area S of the explosion-proof valve 100 satisfies 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 the at least one explosion-proof valve 100. The area refers to the cross-sectional area of the part of the explosion-proof valve 100 for exhaust, i.e., the opening area, which is used to represent the exhaust capacity of the explosion-proof valve 100.

[0056] In the embodiments of the present disclosure, V:S can be 1500mm, 5000mm, 8000mm, etc.

[0057] In addition, the present disclosure does not limit the type of battery 10, which can be a long battery, a blade battery, etc.

[0058] It needs to be explained that the working principle of the explosion-proof valve 100 is that when the internal pressure or temperature of the battery 10 exceeds the opening threshold of the explosion-proof valve 100 due to thermal runaway inside the battery 10, the valve core of the explosion-proof valve 100 can be opened to perform exhaust pressure relief and temperature reduction.

[0059] By using the above technical solutions, D1≥1mm can ensure that the edge of the explosion-proof valve is spaced apart from the large surface of the battery 10 by a certain distance, avoid the explosion-proof valve being too close to the large surface, prevent the large surface of the battery 10 from expanding to cause stress concentration at the explosion-proof valve during normal operation of the battery 10, and ensure the reliability of the explosion-proof valve during operation of the battery 10, while ensuring the welding reliability between the explosion-proof valve and the shell of the battery 10; the volume V of the battery 10 is a constant value, and the lower limit value of S can ensure that when the battery 10 fails, the explosion-proof valve can quickly exhaust the high-temperature and high-pressure gas-liquid substances in the battery 10, meeting the pressure relief requirement; and the upper limit of S is to avoid the area of the explosion-proof valve being too large, causing the valve core of the explosion-proof valve to not easily reach the opening threshold, and causing large opening errors and problems of not being able to open in time.

[0060] Referring to FIGS. 2-9, in embodiments of the present disclosure, the battery 10 can have a plurality of explosion-proof valves 100 arranged along the length direction of the battery 10. In this way, it can be ensured that when thermal failure occurs at any position of the battery 10, there is a relatively close explosion-proof valve 100, so that the high-temperature and high-pressure gas-liquid substance can be discharged in time through a shorter exhaust path.

[0061] For convenience of the following description, the various sides of the battery 10 are named here. Referring to FIGS. 2-9, in some embodiments, the battery 10 can be configured as a cuboid 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 high side 202 and the long side 201 can form a large face 230. The first side 210, the second side 220, and the large face 230 will not be explained below. Of course, the present disclosure does not limit the structure of the battery 10 to be the cuboid structure shown in FIGS. 2-9, and the cuboid structure is only an exemplary illustration.

[0062] Referring to FIGS. 2-9, in 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>100 mm. Specifically, when the explosion-proof valve 100 is located at 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 at 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. In this way, it is more beneficial to meet the pressure relief requirements of the battery 10 with fewer explosion-proof valves 100. Specifically, this is because when L1<100 mm, i.e., the explosion-proof valve 100 is close to the side, this will result in the need for additional arrangement of more explosion-proof valves 100 at a position more than 100 mm away from the side to meet the pressure relief requirements, especially when the side itself has an explosion-proof valve 100. The additional arrangement of the explosion-proof valve 100 close to the side will result in the waste of the explosion-proof valve 100. Conversely, when the explosion-proof valve 100 satisfies L1>100 mm, the explosion-proof valve 100 closest to the side can protect the part of the battery 10 close to the side and also protect another part away from the side, thereby maximizing the protection range of the explosion-proof valve 100.

[0063] Referring to FIGS. 10-11, in some embodiments, the distance D1 between the edges of the explosion-proof valve 100 close to the large face 230 and the large face 230 can satisfy D1 < D / 2, where D is the thickness of the battery 10. In this way, D1 is designed to be less than D / 2, so that when the thickness D of the battery 10 is constant, the side surface (e.g., the first side surface 210, the second side surface 220) adjacent to the large face 230 can have sufficient space to arrange the explosion-proof valve 100, i.e., the size (exhaust area) of the explosion-proof valve 100 can be ensured, thereby ensuring the safety of the battery 10.

[0064] The present disclosure does not limit the thickness D of the battery 10, for example, in embodiments of the present disclosure, D can satisfy 13 mm≤D≤30 mm. D can be specifically 13 mm, 22 mm, 30 mm, etc.

[0065] Referring to FIGS. 2-9, in some embodiments, the explosion-proof valve 100 can be arranged centrally between the two large faces 230. In this way, it can be ensured that the two edges of the explosion-proof valve 100 close to the large face 230 are balanced in stress, thereby ensuring the installation stability of the explosion-proof valve 100. And in this way, the installation area of the explosion-proof valve 100 can be increased to a greater extent when the thickness of the battery 10 is limited.

[0066] Referring to FIGS. 3-6, in some embodiments, the pole 300 of the battery 10 can be arranged on the first side surface 210, and at least one explosion-proof valve 100 can be arranged entirely on the second side surface 220. Alternatively, the pole 300 of the battery 10 can be arranged on the second side surface 220, and at least one explosion-proof valve 100 can be arranged entirely on the first side surface 210. In this way, arranging the pole 300 and the explosion-proof valve 100 on different side surfaces respectively can avoid the pole 300 and the explosion-proof valve 100 occupying each other's arrangement space, thereby facilitating the layout of the pole 300 and the explosion-proof valve 100.

[0067] In some embodiments, the capacity C of the battery 10 can satisfy 50 Ah≤C≤300 Ah, and the area S of the explosion-proof valve 100 and the capacity C of the battery 10 can 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 10 can simultaneously satisfy C:S=0.1-1.5 (Ah / mm 2 ) and V:S=1500-8000 (mm).

[0068] The present disclosure does not limit how the explosion-proof valve 100 is formed on the battery 10, for example, in some embodiments, the battery 10 can include a shell 200, and the explosion-proof valve 100 can be integrally stamped and formed with the shell 200. Alternatively, in other embodiments, the explosion-proof valve 100 can be welded to the shell 200.

[0069] II. Installation position and number of explosion-proof valve

[0070] Referring to FIGS. 2-9, the disclosure exemplarily shows a battery 10 having a length L, a thickness D, a height H and a volume V, and satisfying 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 pack 20 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 surface adjacent to the large surface 230 of the battery 10, and the edge of the explosion-proof valve 100 close to the large surface 230 is spaced apart from the large surface 230 by a distance 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 10, i.e., the wall surface formed by the long side and the high side to be mentioned below; the side surface adjacent to the large surface 230 refers to the wall surface other than the large surface 230 of the battery 10, for example, the first side surface and the second side surface to be mentioned below. The width of the explosion-proof valve 100 is D2 and satisfies 1mm≤D2<D / 2. The "width" here refers to the dimension 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, for example, 110mm, 150mm, etc., as long as it can quickly discharge the high-temperature and high-pressure gas-liquid material when thermal failure occurs at any position of the battery 10. Specifically, when the explosion-proof valve 100 is located at the first side surface, L1 refers to the distance between the edge of the explosion-proof valve 100 close to the second side surface and the second side surface; when the explosion-proof valve 100 is located at the second side surface, L1 refers to the distance between the edge of the explosion-proof valve 100 close to the first side surface and the first side surface.

[0071] In addition, the disclosure does not limit the type of battery 10, which can be a long battery, a blade battery, etc.

[0072] By using the above technical solutions, D1≥1mm can ensure that the edge of the explosion-proof valve and the large face of the battery 10 meet a certain interval, avoid the explosion-proof valve 100 being too close to the large face 230, prevent the large face 230 from expanding to cause stress concentration at the explosion-proof valve 100 when the battery 10 is working normally, and ensure the reliability of the explosion-proof valve 100 when the battery 10 is working, while ensuring the welding reliability between the explosion-proof valve 100 and the battery 10 shell; 1mm≤D2<D / 2 can ensure that the explosion-proof valve 100 has a predetermined exhaust area to meet the required pressure relief requirement, and at the same time, the size of the explosion-proof valve 100 will not affect the strength of the battery 10 shell; L1>100mm makes it unnecessary to additionally arrange too many explosion-proof valves when the length of the battery 10 is certain, which is more conducive to meeting the pressure relief requirements of the battery 10 with fewer explosion-proof valves 100, and meets the needs of the manufacturing process. This is because when L1<100mm, i.e., the explosion-proof valve 100 is close to the side face, this will result in the need to additionally arrange more explosion-proof valves 100 at a position more than 100mm away from the side face to meet the pressure relief requirements, especially when the side face itself has an explosion-proof valve 100. In this case, the additional arrangement of the explosion-proof valve 100 at a position close to the side face will result in a waste of the explosion-proof valve 100. Conversely, when the explosion-proof valve 100 meets L1>100mm, the explosion-proof valve 100 closest to the side face can not only protect the part of the battery 10 close to the side face, but also protect another part away from the side face, thereby maximizing the protection range of the explosion-proof valve 100.

[0073] Referring to FIG. 1, one explosion-proof valve 100 is usually arranged at a position close to one side of the battery 10. However, for a battery 10 with a large capacity and a long length, a single explosion-proof valve 100 is difficult to meet the rapid pressure relief requirements. For example, when the length of the battery 10 is long, the internal exhaust path is also long. When the battery 10 is in thermal runaway, the gas needs to pass through a long path to reach the explosion-proof valve for exhaust. In particular, when the thermal runaway occurs at the farthest end from the explosion-proof valve, the gas needs to flow through the entire battery 10 to be exhausted, which is not conducive to the exhaust of high-temperature gas-liquid substances in the battery 10 during thermal runaway. To solve this problem, referring to FIGS. 2-9, in the embodiments of the present disclosure, the battery 10 can have multiple explosion-proof valves 100 arranged in the length direction, and 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. In other words, the battery 10 is equally divided into two parts in the length direction, and at least one explosion-proof valve 100, for example, one, two, three, etc., is arranged on each part. The specific design can be made according to the exhaust capacity of the explosion-proof valve 100 and the length and capacity of the battery 10, etc.

[0074] It needs to be explained that, with reference to FIG. 3, the explosion-proof valve 100 can be arranged at the middle position of the length direction of the battery 10, that is, the explosion-proof valve 100 is located at the junction of the two L / 2 sections, in this case, it can be considered as the explosion-proof valve 100 on any one of the L / 2 sections, and at this time the battery 10 still has at least another explosion-proof valve 100. And in the embodiment shown in the present disclosure, the left side of the battery 10 (the second side will be mentioned below) and the lower side of the battery 10 (the first side will be mentioned below) can also be provided with at least one explosion-proof valve 100 respectively due to being hidden and cannot be shown, which is not limited by the present disclosure. By such design, at least one explosion-proof valve 100 is arranged in each L / 2 section from one end to the other end of the length direction of the battery 10, so that when thermal runaway occurs at any position of the battery 10, high-temperature and high-pressure gas-liquid substances can be quickly discharged through the explosion-proof valve 100 close to the thermal runaway position, reducing the discharge time and improving the discharge efficiency, avoiding the problem that the thermal runaway position is far away from the explosion-proof valve 100, the discharge path is long (for example, it needs to flow from one end to the other end of the length direction of the battery 10), and the high-temperature and high-pressure gas-liquid substances accumulate in the battery 10, causing the internal pressure and temperature of the battery 10 to rise sharply, further causing the battery 10 shell to rupture, the battery 10 to catch fire, and the like.

[0075] In order to further improve the discharge efficiency, in the embodiment of the present disclosure, at least one explosion-proof valve 100 can be arranged in each L / 3 section from one end to the other end in the length direction. Similarly as above, here it refers to that the battery 10 is sequentially divided into three parts in the length direction, and at least one explosion-proof valve 100 is arranged on each part. For example, with reference to FIG. 2, in this case, when any one of the points A, B and C has thermal failure, high-temperature and high-pressure gas-liquid substances can be quickly discharged through the explosion-proof valve 100 close to the thermal failure position.

[0076] In order to further improve the discharge efficiency, in the embodiment of the present disclosure, at least one explosion-proof valve 100 can be arranged in each L / 5 section from one end to the other end in the length direction. Similarly as above, here it refers to that the battery 10 is sequentially divided into five parts in the length direction, and at least one explosion-proof valve 100 is arranged on each part.

[0077] The present disclosure does not limit the specific installation position of the plurality of explosion-proof valves 100. Referring to FIGS. 2-9, in some embodiments, the battery 10 can be configured as a cuboid structure with 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, and the high side 202 and the thick side 203 can form a second side surface 220. The explosion-proof valve 100 can be arranged on the first side surface 210 or the second side surface 220. In addition, in other embodiments, the explosion-proof valve 100 can also be arranged on the first side surface 210 and the second side surface 220. It should be noted that the first side surface 210 and the second side surface 220 are two and oppositely arranged. 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 during use of the battery 10. Therefore, 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, which is prone to loosening, falling off, and the like. Therefore, installing the explosion-proof valve 100 on the first side surface 210 and the second side surface 220 can avoid this problem.

[0078] Referring to FIGS. 3-6, in some embodiments, all of the at least one explosion-proof valve 100 can be arranged on the same first side surface 210 or the same second side surface 220. In this way, when the plurality of batteries 10 are assembled to form a battery pack 20 and installed on the electric equipment 30, the first side surface 210 or the second side surface 220 on which the explosion-proof valve 100 is installed can be directed away from the high-voltage wire harness side of the pack body of the battery pack 20. In this way, when the battery 10 is in thermal runaway and the internal high-temperature gas is discharged from the explosion-proof valve 100, the high-voltage wire harness of the pack body will not be damaged, the risk of high-voltage arc of the pack body is reduced, and the safety of the pack body is improved.

[0079] Referring to FIGS. 3-6, in some embodiments, the pole 300 of the battery 10 can be arranged on the first side surface 210, and all of the at least one explosion-proof valve 100 can be arranged on the second side surface 220. Alternatively, the pole 300 of the battery 10 can be arranged on the second side surface 220, and all of the at least one explosion-proof valve 100 can be arranged on the first side surface 210. In this way, arranging the pole 300 and the explosion-proof valve 100 on different side surfaces can avoid occupying the arrangement space of each other, thereby facilitating the layout of the pole 300 and the explosion-proof valve 100.

[0080] Referring to FIGS. 2-9, in some embodiments, the explosion-proof valve 100 can be arranged centrally between the two large surfaces 230. In this way, it can be ensured that the two edges of the explosion-proof valve 100 close to the large surfaces 230 are balanced in stress, thereby ensuring the installation stability of the explosion-proof valve 100. In addition, this 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.

[0081] The present disclosure does not limit the specific shape of the explosion-proof valve 100. For example, in some embodiments of the present disclosure, the cross-section of the explosion-proof valve 100 can be racetrack-shaped (i.e., waist-shaped). In addition, in some other embodiments, the cross-section of the explosion-proof valve 100 can also be circular. It should be explained that the cross-section here refers to the cross-section of the gas release passage of the explosion-proof valve 100. It should be explained that the explosion-proof valve 100 with a circular or racetrack-shaped cross-section can better withstand high pressure (easier to uniformly distribute pressure and release), while a square or rectangular shape is prone to stress concentration, resulting in failure or rupture of the explosion-proof valve.

[0082] Referring to FIGS. 2-9, in some embodiments of the present disclosure, on the same first side surface 210, the at least one explosion-proof valve 100 can be symmetrically arranged about the center in the length direction. Or on the same second side surface 220, the at least one explosion-proof valve 100 can be symmetrically arranged about the center in the width direction of the battery 10. Or on the same first side surface 210, the at least one explosion-proof valve 100 can be symmetrically arranged about the center in the length direction, and on the same second side surface 220, the at least one explosion-proof valve 100 can be symmetrically arranged about the center in the width direction of the battery 10. Such design is more conducive to the layout of the explosion-proof valve 100 on the first side surface 210 and the second side surface 220, so as to achieve the exhaust requirement by fewer explosion-proof valves 100. And such symmetrical design is more conducive to the use strength of the battery 10, improving the service life.

[0083] In some embodiments, the first side surface 210 can be provided with one or two explosion-proof valves 100 in the length direction of the battery 10, wherein 300mm≤L≤600mm. In addition, in some other embodiments, the first side surface 210 can be provided with at least three explosion-proof valves 100 in the length direction of the battery 10, wherein 600mm

[0084] The present disclosure does not limit how the explosion-proof valve 100 is formed in the battery 10. For example, in some embodiments, the battery 10 can include a shell 200, and the explosion-proof valve 100 can be integrally stamped and formed with the shell 200. Or, in some other embodiments, the explosion-proof valve 100 can be welded to the shell 200.

[0085] Referring to FIG. 12, according to a second aspect of the present disclosure, a battery pack 20 is provided, which includes the above-mentioned battery 10. Since the battery pack 20 has all the beneficial effects of the above-mentioned battery 10, they will not be repeated here.

[0086] Referring to Fig. 13, according to a third aspect of the present disclosure, there is provided an electric device 30 comprising the battery pack 20 described above, and since the electric device 30 has all the beneficial effects of the battery pack 20 described above, no further elaboration is made here.

[0087] The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above-described embodiments. Various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and all these simple modifications shall fall within the protection scope of the present disclosure.

[0088] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present disclosure will not make further elaboration on various possible combinations.

[0089] In addition, various different embodiments of the present disclosure can also be combined in any appropriate manner, as long as it does not deviate from the idea of the present disclosure, and it shall be considered as disclosed by the present disclosure.

Claims

1. A battery (10) characterized by, The battery (10) has a length L, a thickness D, a height H and satisfies L>D, L>H, 300mm≤L≤2000mm; the battery (10) comprises at least one explosion-proof valve (100), the explosion-proof valve (100) is arranged on the side surface adjacent to the large surface (230) of the battery (10), and the edge of the explosion-proof valve (100) close to the large surface (230) is spaced apart from the large surface (230) by a distance D1 and satisfies 1mm≤D1<D / 2; the total area of the at least one explosion-proof valve (100) is S; the capacity C of the battery (10) satisfies 50Ah≤C≤300Ah, and the total area S of the at least one explosion-proof valve (100) and the capacity C of the battery (10) satisfy the relationship C:S=0.1-1.5 (Ah / mm 2 ).

2. The battery (10) according to claim 1, characterized in that The battery (10) is configured as a cuboid structure with a long side (201), a high side (202) and a thick side (203), the long side (201) and the thick side (203) form a first side (210), and at least one explosion-proof valve (100) is arranged on the first side (210).

3. The battery (10) according to claim 2, characterized in that The first side (210) is provided with one or two explosion-proof valves (100) in the length direction of the battery (10), wherein 300mm≤L≤600mm.

4. The battery (10) according to claim 2, characterized in that The first side (210) is provided with at least three explosion-proof valves (100) in the length direction of the battery (10), wherein 600mm<L≤2000mm.

5. The battery (10) according to claim 3 or 4, characterized in that The high side (202) and the thick side (203) form a second side (220), wherein the distance L1 between the explosion-proof valve (100) on the first side (210) and the second side (220) satisfies L1>100mm.

6. The battery (10) according to any one of claims 1-5, characterized in that, The explosion-proof valve (100) is arranged centrally between two large faces (230).

7. The battery (10) according to any one of claims 2-5, characterized in that, The high side (202) and the thick side (203) form a second side (220), and at least one explosion-proof valve (100) is arranged on the second side (220).

8. The battery (10) according to any one of claims 1-7, characterized in that, The battery (10) is configured as a cuboid structure with a long side (201), a high side (202) and a thick side (203), the long side (201) and the thick side (203) form a first side (210), and the high side (202) and the thick side (203) form a second side (220), Wherein the pole (300) of the battery (10) is arranged on the first side (210), and all the at least one explosion-proof valve (100) is arranged on the second side (220); or the pole (300) of the battery (10) is arranged on the second side (220), and all the at least one explosion-proof valve (100) is arranged on the first side (210).

9. The battery (10) according to any one of claims 1-8, characterized in that, The shell (200) comprises The explosion-proof valve (100) is integrally punched and formed with the shell (200), or the explosion-proof valve (100) is welded with the shell (200).

10. A battery pack (20) characterized by, The battery (10) comprises a plurality of batteries (10) according to any one of claims 1-9.

11. An electrical device (30) characterized by The battery pack (20) comprises the battery (10) according to claim 10. The battery pack (20) comprises the battery (10) according to claim 10.

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