Battery and battery device

Abstract

The utility model relates to a battery and a battery device, the battery comprises a shell, a cover plate assembly and a battery cell, the shell is provided with an opening, the cover plate assembly is arranged at the opening and seals the opening, the battery cell is arranged in the shell, and the cover plate assembly comprises a cover plate and an insulating part; the cover plate is provided with a first surface facing the battery cell, the cover plate is provided with a pole assembly and an anti-explosion valve, the anti-explosion valve comprises a first weak part, and the first weak part is arranged around the pole assembly; the insulating part is arranged on one side, facing the battery core, of the cover plate and is provided with a second surface facing the cover plate, and the insulating part is provided with a second weak part; a protruding part is arranged between the first face and the second face, so that an exhaust channel is formed in at least part of the area between the first face and the second face, and the exhaust channel communicates with the first weak part and the second weak part. The ratio of the first distance between the two farthest ends of the first weak part to the height of the protruding part is 3-600.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery and a battery device. Background Art

[0002] In the existing battery design, some batteries are provided with explosion-proof valves arranged around the pole assembly on the cover plate, and an insulating member is also provided on the side of the cover plate facing the battery cell, and an exhaust channel is formed between the cover plate and the insulating member. On this basis, when the pole assembly is larger, the size of the corresponding explosion-proof valve will also be larger. However, in the existing design, the space of the exhaust channel between the insulating member and the cover plate is small, which is difficult to meet the space requirements for the explosion of the explosion-proof valve, resulting in the problem that the explosion-proof valve cannot explode normally when the battery has thermal runaway. Utility Model Content

[0003] A main purpose of the utility model is to overcome at least one defect of the above-mentioned prior art and provide a battery capable of ensuring the normal explosion function of the explosion-proof valve.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] According to one aspect of the utility model, a battery is provided, which includes a shell, a cover plate assembly and a battery cell, the shell having an opening, the cover plate assembly being arranged at the opening and closing the opening, the battery cell being arranged in the shell, the cover plate assembly including a cover plate and an insulating member; the cover plate having a first surface facing the battery cell, the cover plate being provided with a pole assembly and an explosion-proof valve, the explosion-proof valve including a first weak portion, the first weak portion being arranged around the pole assembly; the insulating member being arranged on a side of the cover plate facing the battery cell, and having a second surface facing the cover plate, the insulating member being provided with a second weak portion; wherein a protrusion is provided between the first surface and the second surface, so that at least a partial area between the first surface and the second surface forms an exhaust channel, the exhaust channel connecting the first weak portion and the second weak portion; wherein the ratio of a first distance between two ends of the first weak portion which are farthest apart to a height of the protrusion is 3 to 600.

[0006] It can be seen from the above technical solution that the advantages and positive effects of the battery proposed by the utility model are:

[0007] The battery proposed in the utility model includes a shell, a cover plate and an insulating member, a pole assembly and an explosion-proof valve are arranged on the cover plate, the explosion-proof valve includes a first weak portion, the first weak portion is arranged around the pole assembly, and the insulating member is provided with a second weak portion. On this basis, the utility model uses the protrusion arranged between the cover plate and the insulating member to form an exhaust channel, and the exhaust channel connects the first weak portion and the second weak portion, thereby connecting the inside of the shell with the explosion-proof valve. Among them, the ratio of the first distance between the two ends of the first weak portion that are farthest apart to the height of the protrusion is 3 to 600. Through the above-mentioned structural design, the utility model specially designs the ratio of the distance between the two ends of the first weak portion that are farthest apart to the height of the protrusion, which can achieve that when the explosion-proof valve is larger, the height of the protrusion is larger, that is, the space of the exhaust channel is larger, thereby ensuring that the explosion-proof valve can be normally exploded when the battery has thermal runaway, which is particularly suitable for meeting the explosion requirements when the area of ​​the pole assembly is designed to be larger in order to improve the flow capacity of the pole assembly, which leads to a larger explosion-proof valve, and is conducive to the improvement of the flow capacity of the battery pole assembly.

[0008] Another main purpose of the present invention is to overcome at least one of the above-mentioned defects of the prior art and provide a battery device using the above-mentioned battery.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] According to another aspect of the present invention, a battery device is provided, wherein the battery device includes the battery provided by the present invention.

[0011] It can be seen from the above technical solutions that the advantages and positive effects of the battery device proposed by the utility model are:

[0012] The battery device proposed in the utility model, by adopting the battery proposed in the utility model, can ensure that the explosion-proof valve can explode normally when thermal runaway occurs in the battery, and is particularly suitable for meeting the explosion requirement when the explosion-proof valve is larger due to the larger area designed to improve the flow capacity of the pole assembly, which is beneficial to improving the flow capacity of the battery pole assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts. Among them:

[0014] Figure 1 is a schematic diagram of a three-dimensional structure of a battery according to an exemplary embodiment;

[0015] Figure 2 and Figure 3They are Figure 1 The three-dimensional structure schematic diagram of the cover plate assembly at two different viewing angles is shown;

[0016] Figure 4 and Figure 5 They are Figure 1 A top view and a bottom view of the cover plate assembly are shown;

[0017] Figure 6 and Figure 7 They are Figure 1 The illustrated three-dimensional exploded schematic diagram of the cover plate assembly at two different viewing angles;

[0018] Figure 8 is along Figure 5 The cross-section made by the straight line AA in;

[0019] Fig. 9 yes Figure 3 A schematic diagram of the three-dimensional structure of the insulating member shown;

[0020] Fig.10 yes Figure 3 A top view of the insulating member is shown;

[0021] Fig.11 is a top view of an insulating member of a battery according to another exemplary embodiment.

[0022] The following are the descriptions of the reference numerals:

[0023] 100. Shell;

[0024] 200. Cover plate assembly;

[0025] 210. Cover plate;

[0026] 211. Pole assembly;

[0027] 212. The first weak point;

[0028] 220. Insulation parts;

[0029] 221. The second weak part;

[0030] 222. Raised part;

[0031] 223.Through hole;

[0032] C. Fan-shaped area;

[0033] d1. first distance;

[0034] d2. The second distance;

[0035] w.width;

[0036] h.Height;

[0037] P. Exhaust channel;

[0038] S1. First side;

[0039] S2. Second side;

[0040] S3. The third side. DETAILED DESCRIPTION

[0041] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and drawings therein are essentially for illustrative purposes rather than for limiting the present invention.

[0042] In the following description of different exemplary embodiments of the utility model, reference is made to the accompanying drawings, which form a part of the utility model and in which different exemplary structures, systems and steps that can implement multiple aspects of the utility model are shown by way of example. It should be understood that other specific schemes of components, structures, exemplary devices, systems and steps can be used, and structural and functional modifications can be made without departing from the scope of the utility model. Moreover, although the terms "above", "between", "within", etc. can be used in this specification to describe different exemplary features and elements of the utility model, these terms are used herein only for convenience, such as according to the direction of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the utility model.

[0043] See also Figure 1 , which representatively shows a schematic diagram of the three-dimensional structure of the battery proposed in the utility model. In this exemplary embodiment, the battery proposed in the utility model is described by taking the application of the battery pack in a vehicle as an example. It is easy for those skilled in the art to understand that in order to apply the relevant design of the utility model to other types of battery devices, various modifications, additions, substitutions, deletions or other changes are made to the specific embodiments described below, and these changes are still within the scope of the principle of the battery proposed in the utility model.

[0044] like Figure 1 As shown, in one embodiment of the present invention, the battery provided by the present invention includes a housing 100, a cover assembly 200 and a battery cell. The cover assembly 200 is disposed at the end of the housing 100, and the battery cell is disposed in the housing 100. Figures 2 to 10 , Figure 2 and Figure 3 Schematic diagrams of the three-dimensional structure of the cover plate assembly 200 at two different viewing angles are representatively shown; Figure 4 and Figure 52 and 3 respectively show a top view and a bottom view of the cover plate assembly 200; Figure 6 and Figure 7 2 and 3 respectively show three-dimensional exploded schematic diagrams of the cover plate assembly 200 at two different viewing angles; Figure 8 The representative diagram shows the Figure 5 The cross-section made by the straight line AA in; Fig. 9 A three-dimensional structural schematic diagram of the insulating member 220 is representatively shown in FIG. Fig.10 2 is a representative top view of the insulating member 220. The following will describe in detail the structure, connection mode and functional relationship of the main components of the battery proposed by the present invention in combination with the above drawings.

[0045] like Figures 1 to 10As shown, in one embodiment of the present invention, the cover plate assembly 200 includes a cover plate 210 and an insulating member 220. The cover plate 210 has a first surface S1 facing the battery cell, and the cover plate 210 is provided with a pole assembly 211 and an explosion-proof valve, and the explosion-proof valve includes a first weak portion 212, and the first weak portion 212 is arranged around the pole assembly 211. In this embodiment, the first weak portion 212 is an example of a closed annular structure arranged around the pole assembly 211. In some embodiments, the first weak portion 212 may also be a non-closed structure, but is not limited thereto. It should be noted that the first weak portion 212 can be understood as a thinned area of ​​the cover plate 210, that is, the thickness of a part of the cover plate 210 is thinned relative to other areas to form the first weak portion 212, such as the following notch, or the first weak portion 212 can also be understood as a part of the cover plate 210 formed by a material that is easier to break or melt than other areas. Accordingly, when the battery has thermal runaway, the cover plate 210 can be cracked at the position of the first weak portion 212 to achieve gas release. The insulating member 220 is arranged on the side of the cover plate 210 facing the battery cell, and the insulating member 220 has a second surface S2 facing the cover plate 210, and the insulating member 220 is provided with a second weak portion 221 that penetrates along the thickness direction. It should be noted that the second weak portion 221 can be understood as a thinned area of ​​the insulating member 220, that is, the thickness of a part of the insulating member 220 is thinned relative to other areas to form the second weak portion 221, such as a notch, or the second weak portion 221 can also be understood as a part of the insulating member 220 formed by a material that is easier to break or melt through than other areas. Accordingly, when the battery has thermal runaway, the gas can pass through the insulating member 220 at the position of the second weak portion 221 to achieve gas release. Among them, a protrusion 222 is provided between the first surface S1 of the cover plate 210 and the second surface S2 of the insulating member 220. The protrusion 222 can form an exhaust channel P in at least a part of the area between the first surface S1 and the second surface S2. The exhaust channel P connects the first weak portion 212 and the second weak portion 221. Accordingly, when the battery has thermal runaway, the gas inside the battery can pass through the insulating member 220 via the second weak portion 221 and enter the exhaust channel P. On this basis, the ratio of the first distance d1 between the two ends of the first weak portion 212 that are farthest apart to the height h of the protrusion 222 is 3 to 600, such as 3, 10, 50, 100, 200, 300, 600, etc. Through the above structural design, the utility model specially designs the ratio of the distance between the two ends of the first weak portion 212 that are farthest apart to the height of the protrusion 222, so that the larger the explosion-proof valve is, the larger the height of the protrusion is, that is, the larger the space of the exhaust channel P is, thereby ensuring that the explosion-proof valve can be normally exploded when the battery has thermal runaway, which is particularly suitable for meeting the explosion requirements when the area of ​​the pole assembly 211 is designed to be larger in order to improve the flow capacity of the pole assembly 211, and is conducive to improving the flow capacity of the battery pole assembly 211.

[0046] It should be noted that in Figures 1 to 10 In the illustrated embodiment, the utility model is described by taking the first weak portion 212 as a circular ring-shaped closed structure as an example. In this case, the first distance d1 can be understood as the diameter of the corresponding circle of the first weak portion 212. It should be understood that in some embodiments, the first weak portion 212 can also be in other structures. For example, when the first weak portion 212 is in an elliptical ring shape, the first distance d1 can be understood as the length of the major axis of the ellipse. For another example, when the first weak portion 212 is in a parallelogram shape, the first distance d1 can be understood as the length of a longer diagonal line of the parallelogram. For another example, when the first weak portion 212 is in a regular polygon shape, the first distance d1 can be understood as the length of any diagonal line of the regular polygon.

[0047] In addition, Figures 1 to 10 In the illustrated embodiment, the utility model is described by taking the first weak portion 212 as a closed structure as an example. It should be understood that in some embodiments, the first weak portion 212 may also be in a non-closed shape, and further may be a combination of multiple sections of non-closed shapes arranged at intervals, and the multiple sections of the first weak portion 212 are still arranged along and around the pole assembly 211. Alternatively, the explosion-proof valve may also have a partially unthinned area, thereby preventing the explosion-proof valve from being ejected as a whole when the first weak portion 212 explodes.

[0048] like Figure 4 and Fig.10 As shown, in one embodiment of the present invention, the first weak portion 212 is arranged along a circular path, the minimum distance between the protrusion 222 and the edge of the insulating member 220 is the second distance d2, and the ratio of the first distance d1 to the second distance d2 can be 0.3 to 60, such as 0.3, 1, 5, 10, 20, 30, 60, etc. Through the above structural design, as the area of ​​the explosion-proof valve increases, the explosion difficulty thereof increases, and therefore a larger exhaust channel P is required. In this regard, the utility model designs the second distance d2 to be larger, and can provide a larger exhaust channel P, thereby being suitable for the application needs of explosion-proof valves with larger areas, and ensuring the normal explosion of the explosion-proof valve. On this basis, when the first weak portion 212 is closer to the edge of the insulating member 220, the utility model can make the protrusion 222 closer to the center of the insulating member 220, that is, the protrusion 222 is farther from the edge of the insulating member 220. When the first weak portion 212 is closer to the center of the insulating member 220, the utility model can make the protrusion 222 farther from the center of the insulating member 220, that is, the protrusion 222 is closer to the edge of the insulating member 220.

[0049] like Figure 6 , Fig. 9 and Fig.10As shown, in one embodiment of the present invention, the plane where the second surface S2 is located is defined as a reference plane (when the first surface S1 is parallel to the second surface S2, the plane where the first surface S1 is located can also be defined as a reference plane), on which the orthographic projection of the protrusion 222 and the orthographic projection of the second weak portion 221 can be arranged at intervals. On this basis, the orthographic projection of the second weak portion 221 is closer to the outer edge of the orthographic projection of the insulating member 220 than the orthographic projection of the protrusion 222. Through the above structural design, the present invention arranges the protrusion 222 and the second weak portion 221 at intervals, which can simplify the structural complexity and reduce the difficulty of processing. Among them, when the first weak portion 212 is arranged along a circular path, when the above-mentioned first distance d1 is large, that is, when the area of ​​the explosion-proof valve is large, the present invention designs the distance between the protrusion 222 and the edge of the insulating member 220 to be large, thereby increasing the area of ​​the exhaust channel P, and further, when the above-mentioned first distance d1 is small, the present invention designs the distance between the protrusion 222 and the edge of the insulating member 220 to be small.

[0050] See also Fig.11 , Fig.11 FIG. 4 representatively shows a top view of an insulating member 220 in another exemplary embodiment of a battery that can embody the principles of the present invention.

[0051] Different from Fig.10 In the illustrated embodiment, a structural design is adopted in which the orthographic projection of the second weak portion 221 is closer to the outer edge of the orthographic projection of the insulating member 220 than the orthographic projection of the protruding portion 222. In one embodiment of the present invention, the orthographic projection of the protruding portion 222 may also be closer to the outer edge of the orthographic projection of the insulating member 220 than the orthographic projection of the second weak portion 221. In other words, in various possible embodiments consistent with the design concept of the present invention, when the orthographic projection of the protruding portion 222 and the orthographic projection of the second weak portion 221 are arranged at intervals, for the orthographic projection of the protruding portion 222 and the orthographic projection of the second weak portion 221, one of them is closer to the outer edge of the orthographic projection of the insulating member 220 than the other.

[0052] Based on the structural design that the orthographic projection of the protruding portion 222 and the orthographic projection of the second weak portion 221 are arranged at intervals, such as Figure 8 As shown, in one embodiment of the present invention, on the above-mentioned reference plane, the orthographic projection of the first weak portion 212 may partially overlap with the orthographic projection of the protruding portion 222. At this time, the protruding portion 222 may include at least two sections arranged at intervals along an arrangement path, and an opening communicating with the first weak portion 212 and the exhaust passage P is formed between two adjacent sections of the protruding portion 222, thereby avoiding that the first weak portion 212 is completely blocked by the protruding portion 222 when overlapping with the protruding portion 222. In some embodiments, the orthographic projection of the first weak portion 212 may also at least partially overlap with the orthographic projection of the second weak portion 221, which is not limited to the above-mentioned embodiments.

[0053] Based on the structural design that the orthographic projection of the protrusion 222 and the orthographic projection of the second weak portion 221 are arranged at intervals, in an embodiment not shown in the figure of the present utility model, on the above-mentioned reference plane, the orthographic projection of the first weak portion 212 can be located between the orthographic projection of the protrusion 222 and the orthographic projection of the second weak portion 221. Through the above-mentioned structural design, the utility model can further ensure the communication between the exhaust passage P and the first weak portion 212, which is conducive to ensuring the normal explosion of the explosion-proof valve. In some embodiments, the orthographic projection of the first weak portion 212 can also be farther away from or closer to the edge of the orthographic projection of the insulating member 220 than the orthographic projections of both the protrusion 222 and the second weak portion 221, which is not limited to this embodiment.

[0054] like Figure 8 As shown, in one embodiment of the present invention, the height h of the protrusion 222 along the height direction of the battery (i.e., the thickness direction of the cover plate 210) can be 0.05mm to 3mm, such as 0.05mm, 0.1mm, 0.5mm, 1mm, 3mm, etc. Through the above structural design, the present invention can avoid the height h of the protrusion 222 being too small, which makes the space of the exhaust channel P too small and affects the normal explosion of the explosion-proof valve, and can also avoid the height h of the protrusion 222 being too large, which causes too much space to be occupied and affects the energy density of the battery. In some embodiments, the height h of the protrusion 222 can also be less than 0.05mm, or can be greater than 3mm, such as 0.049mm, 3.01mm, etc., and is not limited to this embodiment.

[0055] like Figure 4 and Figure 8 As shown, in one embodiment of the present invention, the first distance d1 can be greater than or equal to 12 mm. On this basis, the height h of the protrusion 222 can be 0.1 mm to 3 mm. Through the above structural design, the present invention can further avoid the height h of the protrusion 222 being too small and causing the space of the exhaust channel P to be too small to affect the normal explosion of the explosion-proof valve when the explosion-proof valve area is large (that is, the distance between the two ends of the first weak portion 212 that are farthest apart is not less than a certain value).

[0056] like Figure 8As shown, in one embodiment of the present invention, the ratio of the width w of the protrusion 222 along the radial direction to its height h can be 0.03 to 50, such as 0.03, 0.05, 1, 5, 10, 30, 50, etc. The so-called radial direction can be understood as the radial direction of one of the circular paths where the protrusion 222 is arranged passing through the protrusion 222, and can also be understood as the radial direction of the cylindrical battery when the battery is a cylindrical battery. Through the above structural design, since the greater the height h of the protrusion 222, the greater its width w can be, the assembly performance of the insulating member 220 and the cover plate 210 can be enhanced. At the same time, when the height h of the protrusion 222 is small, the above ratio design is used to prevent the width w of the protrusion 222 from being too large, which leads to a reduction in the space of the exhaust channel P.

[0057] like Fig.10 As shown, in one embodiment of the present invention, the cover plate assembly 200 may include at least two protrusions 222, for example but not limited to the six shown in the drawings. Among them, on the above reference plane, the orthographic projections of at least two protrusions 222 are spaced apart from each other and arranged around the orthographic projection of the pole assembly 211. Through the above structural design, the present invention arranges at least two protrusions 222 at intervals, which can provide more channels for gas escape, further facilitating the normal explosion of the explosion-proof valve.

[0058] like Fig.10 As shown, based on the structural design that the cover plate assembly 200 includes at least two protrusions 222 arranged at intervals, in one embodiment of the utility model, the insulating member 220 may be provided with at least two second weak portions 221, for example but not limited to the six shown in the figure. Among them, on the above-mentioned reference plane, the orthographic projections of at least two second weak portions 221 are spaced from each other and arranged around the orthographic projection of the pole assembly 211. On this basis, in the circumferential direction around the pole assembly 211, at least one second weak portion 221 is arranged correspondingly to the interval area between at least two adjacent protrusions 222. The so-called "corresponding arrangement" can be understood as: the corresponding center of the at least two protrusions 222 when arranged along the circular path is used to make rays to the two end points of the interval area respectively, and the two rays roughly enclose a fan-shaped area C with a gradually expanding outer edge. Accordingly, the corresponding arrangement means that on a reference plane perpendicular to the battery axis (i.e. parallel to the cover plate 210), the orthographic projection of the second weak portion 221 is at least partially located within the range of the orthographic projection of the above-mentioned fan-shaped area C. Through the above-mentioned structural design, the utility model can realize the staggered arrangement of the second weak portion 221 and the raised portion 222 in the circumferential direction around the pole assembly 211, which is conducive to forming a continuous exhaust channel P, further conducive to the normal explosion of the explosion-proof valve, and the gas released from the battery can be released into the exhaust channel P through the second weak portion 221.

[0059] like Fig.10or Fig.11 As shown, based on the structural design of the staggered arrangement of the second weak portions 221 and the raised portions 222 in the circumferential direction around the pole assembly 211, in some embodiments of the present invention, in the circumferential direction around the pole assembly 211, each second weak portion 221 is arranged corresponding to the spacing area between two adjacent raised portions 222, and the spacing area between any two adjacent raised portions 222 is arranged corresponding to only one second weak portion 221. In other words, the second weak portions 221 and the raised portions 222 are staggered one by one in the circumferential direction around the pole assembly 211. That is, in combination with Fig.10 In the illustrated sector-shaped areas C, the orthographic projection of each sector-shaped area C overlaps with the orthographic projection of only one second weak portion 221 , and the orthographic projection of each second weak portion 221 overlaps with the orthographic projection of only one sector-shaped area C.

[0060] In an embodiment not shown in the figure of the present invention, the cover plate assembly 200 may include only one protrusion 222, and the plane where the second surface S2 is located is defined as a reference plane, on which the orthographic projection of the protrusion 222 may be a closed ring surrounding the orthographic projection of the pole assembly 211. On this basis, the orthographic projection of the second weak portion 221 and the orthographic projection of the first weak portion 212 are both located within the above-mentioned closed ring, or are both located outside the above-mentioned closed ring. Through the above-mentioned structural design, the present invention can still ensure that the exhaust channel P is connected to the first weak portion 212 and the second weak portion 221 when the protrusion 222 adopts a closed ring structure.

[0061] like Figure 6 , Figures 8 to 10 As shown, in one embodiment of the present invention, at least one protrusion 222 is disposed on the second surface S2 of the insulating member 220 and abuts against the first surface S1 of the cover plate 210. In some embodiments, at least one protrusion 222 may also be disposed on the first surface S1 of the cover plate 210 and abut against the second surface S2 of the insulating member 220. Furthermore, the first surface S1 of the cover plate 210 and the second surface S2 of the insulating member 220 may also be both disposed with at least one protrusion 222, and the protrusion 222 disposed on the first surface S1 abuts against the second surface S2, and the protrusion 222 disposed on the second surface S2 abuts against the first surface S1, and the above embodiment is not limited thereto.

[0062] like Fig. 9 and Fig.10 As shown, in one embodiment of the present invention, a through hole 223 is provided in the middle of the insulating member 220 and passes through in the thickness direction, and the through hole 223 is suitable for the pole assembly 211 to pass through. Accordingly, due to the provision of the through hole 223, the second surface S2 of the insulating member 220 is an annular surface (for example, but not limited to the circular ring shown in the drawings).

[0063] like Figure 4, Figure 6 and Figure 8 As shown, in one embodiment of the present invention, the cover plate 210 has a third surface S3 facing away from the battery cell, and the first weak portion 212 can be a notch disposed on the third surface S3. In other words, the first weak portion 212 is generally a groove-shaped structure, and the notch of the groove-shaped structure is open on the third surface S3.

[0064] In an embodiment not shown in the figure, the second weak portion 221 may include a through hole that penetrates the insulating member 220 along the thickness direction, so that the internal airflow enters the exhaust channel P through the through hole. In some embodiments, the second weak portion 221 may also adopt other structures, such as notches, etc., and is not limited to the above embodiments.

[0065] like Figure 1 , Figure 4 , Figure 5 As shown, in one embodiment of the present invention, the battery proposed in the present invention may be a cylindrical battery. On this basis, the cover plate 210 and the insulating member 220 may both be circular, the first weak portion 212 may be a circular ring (or arc shape) surrounding the pole assembly 211, and the above-mentioned first closed path and second closed path may both be circular. In some embodiments, when the battery is a cylindrical battery, the first weak portion 212 may also be other shapes surrounding the pole assembly 211, and the first closed path and the second closed path may also be other shapes. Furthermore, the battery proposed in the present invention may also be a battery of other shapes, such as a square shell battery, etc., which is not limited to the above-mentioned embodiments.

[0066] It should be noted that the batteries shown in the drawings and described in this specification are only a few examples of many types of batteries that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details or any components of the batteries shown in the drawings or described in this specification.

[0067] In summary, the battery proposed in the utility model includes a shell 100, a cover plate 210 and an insulating member 220, a pole assembly 211 and an explosion-proof valve are arranged on the cover plate 210, and the explosion-proof valve includes a first weak portion 212, the first weak portion 212 is arranged around the pole assembly 211, and the insulating member 220 is provided with a second weak portion 221. On this basis, the utility model uses the protrusion 222 arranged between the cover plate 210 and the insulating member 220 to form an exhaust channel P, and the exhaust channel P connects the first weak portion 212 and the second weak portion 221, thereby connecting the inside of the shell 100 with the explosion-proof valve. Among them, the ratio of the first distance d1 between the two ends of the first weak portion 212 that are farthest apart to the height h of the protrusion 222 is 3 to 600. Through the above-mentioned structural design, the utility model specially designs the ratio of the distance between the two ends of the first weak part 212 that are farthest apart to the height of the protrusion 222, so that the larger the explosion-proof valve is, the larger the height of the protrusion is, that is, the larger the space of the exhaust channel P is, thereby ensuring that the explosion-proof valve can explode normally when thermal runaway occurs in the battery, which is particularly suitable for meeting the explosion requirement when the area of ​​the pole assembly 211 is designed to be larger in order to improve its flow capacity, and is beneficial to improving the flow capacity of the battery pole assembly 211.

[0068] Based on the above detailed description of several exemplary embodiments of the battery proposed in the present invention, an exemplary embodiment of the battery device proposed in the present invention will be described below.

[0069] In one embodiment of the present invention, the battery device provided by the present invention includes the battery provided by the present invention.

[0070] It should be noted that the battery devices shown in the drawings and described in this specification are only a few examples of many battery devices that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details or any components of the battery devices shown in the drawings or described in this specification.

[0071] To sum up, the battery device proposed in the utility model, by adopting the battery proposed in the utility model, can ensure that the explosion-proof valve can explode normally when the battery has thermal runaway, and is particularly suitable for meeting the explosion requirements when the explosion-proof valve is larger due to the larger area designed to improve the flow capacity of the pole assembly, which is beneficial to improving the flow capacity of the battery pole assembly.

[0072] The above describes and / or illustrates in detail the exemplary embodiments of the battery and battery device proposed by the utility model. However, the embodiments of the utility model are not limited to the specific embodiments described here. On the contrary, the components and / or steps of each embodiment can be used independently and separately from other components and / or steps described here. Each component and / or each step of an embodiment can also be used in combination with other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated here, the terms "one", "one" and "above" are used to indicate the presence of one or more elements / components / etc. The terms "comprising", "including" and "having" are used to indicate the meaning of open inclusion and mean that in addition to the listed elements / components / etc., there may be other elements / components / etc. In addition, the terms "first" and "second" in the claims and the specification are used only as marks and are not numerical restrictions on their objects.

[0073] Although the battery and battery device proposed by the present invention have been described according to different specific embodiments, those skilled in the art will recognize that the implementation of the present invention can be modified within the spirit and scope of the claims.

Claims

1. A battery, characterized in that: The invention comprises a shell, a cover plate assembly and a battery cell, wherein the shell has an opening, the cover plate assembly is arranged at the opening and closes the opening, the battery cell is arranged in the shell, and the cover plate assembly comprises: A cover plate having a first surface facing the battery core, the cover plate being provided with a pole assembly and an explosion-proof valve, the explosion-proof valve comprising a first weak portion, and the first weak portion being arranged around the pole assembly; An insulating member, disposed on a side of the cover plate facing the battery core and having a second surface facing the cover plate, wherein the insulating member is provided with a second weak portion; Wherein, a convex portion is provided between the first surface and the second surface, so that at least a portion of the area between the first surface and the second surface forms an exhaust channel, and the exhaust channel communicates with the first weak portion and the second weak portion; Wherein, a ratio of a first distance between two ends of the first weak portion that are farthest apart from each other to a height of the protruding portion is 3-600.

2. The battery according to claim 1, characterized in that The first weak portion is arranged along a circular path, the minimum distance between the protruding portion and the edge of the insulating member is a second distance, and the ratio of the first distance to the second distance is 0.3-60.

3. The battery according to claim 1, characterized in that The height of the protrusion is 0.05 mm to 3 mm.

4. The battery according to claim 1, characterized in that The first distance is greater than or equal to 12 mm, and the height of the protrusion is 0.1 mm to 3 mm.

5. The battery according to claim 1, characterized in that The ratio of the width to the height of the protrusion is 0.03-50.

6. The battery according to claim 1, characterized in that The cover plate assembly includes at least two protrusions, and the plane where the second surface is located is defined as a reference plane. On the reference plane, the orthographic projections of at least two protrusions are spaced apart from each other and arranged around the orthographic projection of the pole assembly.

7. The battery according to claim 6, characterized in that The insulating member is provided with at least two second weak portions, and on the reference plane, the orthographic projections of at least two second weak portions are spaced apart from each other and arranged around the orthographic projection of the pole assembly; wherein, in the circumferential direction around the pole assembly, at least one second weak portion is arranged corresponding to the spacing area between at least two adjacent protrusions.

8. The battery according to claim 7, characterized in that Each of the second weak portions is arranged corresponding to a spacing area between two adjacent protrusions, and the spacing area between any two adjacent protrusions is arranged corresponding to only one of the second weak portions.

9. The battery according to claim 1, characterized in that The cover plate assembly includes a raised portion, and the plane where the second surface is located is defined as a reference plane. On the reference plane, the orthographic projection of the raised portion is a closed ring surrounding the orthographic projection of the pole assembly; wherein the orthographic projection of the second weak portion and the orthographic projection of the first weak portion are both located within the closed ring, or are both located outside the closed ring.

10. The battery according to claim 1, characterized in that: At least one of the protrusions is disposed on the first surface and abuts against the second surface; and / or At least one of the protrusions is disposed on the second surface and abuts against the first surface.

11. The battery according to claim 1, characterized in that The second weak portion includes a through hole, and the through hole penetrates the insulating member along a thickness direction.

12. The battery according to any one of claims 1 to 11, characterized in that: The battery is a cylindrical battery.

13. A battery device, characterized in that: A battery comprising the battery according to any one of claims 1 to 12.

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