Shell structure, battery, battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, and discloses a shell structure, a battery, a battery pack and electric equipment, the shell structure is cylindrical, and at least one end of the shell structure along the length direction forms an opening part; the shell structure at least comprises a first shell face, a second shell face and a connecting face connected with the first shell face and the second shell face. The first shell face and the second shell face are arranged at an angle, and the planes where the first shell face and the second shell face are located are both parallel to the length direction of the shell structure. The connecting surface is an arc-shaped surface, and the connecting surface is partially sunken to form a nick part. According to the shell structure provided by the utility model, the nick part is used as an anti-explosion valve, and the strength of the connecting surface is higher, so that the peripheral strength of the anti-explosion valve can be improved, and the valve opening stability of the shell structure is improved. The situation that high-heat gas needs to move for a long distance in the length direction of the shell when reaching the anti-explosion valve is avoided, the situation that an exhaust path is too long is avoided, the probability of blockage is reduced, and the exhaust area is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a casing structure, battery, battery pack and electric equipment. BACKGROUND

[0002] The battery is divided according to structural form mainly including cylindrical battery, square can battery, soft package battery etc., wherein, blade battery is a special form square can battery, its shape is long and thin, can be inserted into battery package like " blade ", so called.

[0003] The blade battery usually includes casing and cover plate, and the casing forms opening part along at least one end of length direction, and the cover plate is arranged in the opening part.In related technology, the explosion-proof valve of blade battery is arranged on the cover plate, but because the length direction of blade battery is long, the area of explosion-proof valve arranged on the cover plate is limited by space layout, when thermal runaway occurs, it is easy to cause overall exhaust not smooth, and it is easy to cause shell explosion. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a casing structure, battery, battery pack and electric equipment to solve the problem that blade battery is prone to exhaust not smooth when thermal runaway occurs.

[0005] Firstly, the utility model provides a casing structure, which is constructed as a cylinder, and forms an opening part along at least one end of the length direction; the casing structure comprises at least:

[0006] The first shell surface and the second shell surface, and the connecting surface connecting the first shell surface and the second shell surface;

[0007] The first shell surface and the second shell surface are arranged at an angle, and the planes of the first shell surface and the second shell surface are parallel to the length direction of the casing structure;

[0008] The connecting surface is constructed as an arc surface, and the connecting surface is locally recessed to form a notch part.

[0009] Beneficial effects: the shell structure provided by the embodiment of the utility model, the notch part is formed by local recessing on the connecting surface, the notch part serves as the explosion-proof valve, the strength of the connecting surface is higher, the strength of the periphery of the explosion-proof valve can be improved, and the opening stability of the shell structure is increased. Moreover, the connecting surface connects the first shell surface and the second shell surface, and the first shell surface and the second shell surface are parallel to the length direction of the shell structure, that is, the connecting surface is also parallel to the length direction of the shell structure, the notch part is arranged on the connecting surface, in the case of thermal runaway of the battery, the internal high-pressure gas only needs to move along the height direction or the width direction, the situation that the high-temperature gas needs to move a long distance along the length direction of the shell to reach the explosion-proof valve is avoided, the exhaust path is not too long, the probability of blockage is reduced, the length advantage of the shell structure can be reasonably utilized, and the exhaust area is ensured. In addition, compared with the related art, the explosion-proof valve is transferred from the cover plate to the shell structure, the space utilization rate of the cover plate can be improved, and because the explosion-proof valve is at the position of the connecting surface, the space of the R corner region of the shell structure can be reasonably utilized, the valuable space of the battery is not wasted, and the battery energy density is improved.

[0010] In an optional embodiment, the shell structure comprises two first shell surfaces oppositely arranged along the height direction, and two second shell surfaces oppositely arranged along the width direction; a connecting surface is formed between adjacent first shell surfaces and second shell surfaces.

[0011] Wherein, the length direction, the width direction and the height direction are perpendicular to each other.

[0012] In an optional embodiment, the notch part is formed at a position close to the first shell surface of the connecting surface.

[0013] Beneficial effects: the shell structure has a burst-open state along the notch part, and the shell structure forms a burst-open part in the burst-open state. When the first shell surface close to the notch part of the shell structure is the bottom surface of the battery, by forming the notch part at a position close to the first shell surface of the connecting surface, more plate materials of the connecting surface are connected with the second shell surface when the burst-open part is formed, the exhaust direction of the burst-open part can be guided to the lower side of the shell structure, so that the pressure relief direction or area is better controlled, and the burst direction is more reasonable.

[0014] In an optional embodiment, the shell structure is formed with a weld seam, and the notch part and the weld seam are located on two sides of the shell structure along the height direction, or the notch part and the weld seam are located on two sides of the shell structure along the width direction.

[0015] Beneficial effects: because the weld seam is a stress concentration area, by arranging the notch part and the weld seam away from each other along the height direction or the width direction, the stress of the weld seam can be avoided to affect the opening pressure of the notch part, the opening stability of the shell structure is ensured, and the welding quality can be ensured, and the mutual interference of the notch part and the weld seam is avoided.

[0016] In an alternative embodiment, the shell structure has an inner surface facing the cylindrical interior and an outer surface facing the cylindrical exterior, and the score portion is recessed from the inner surface toward the outer surface.

[0017] Beneficial effects: By recessing the score portion from the inner surface toward the outer surface, the integrity of the appearance of the shell structure is ensured, and in the case of thermal runaway of the battery, the high-pressure gas inside can directly act on the score portion, which is conducive to improving the valve opening efficiency and ensuring the stability of the valve opening pressure.

[0018] In an alternative embodiment, the recess depth of the score portion is A0, which satisfies: 0mm < A0 < T0, where T0 is the wall thickness of the shell structure;

[0019] And / or, the width of the score portion is B0, which satisfies: B0 < R1, where R1 is the radius of the inner surface of the connecting surface.

[0020] In an alternative embodiment, a first transition fillet is formed between the sidewall of the score portion and the inner surface, and the radius of the first transition fillet is R3, which satisfies: R3 > 0mm;

[0021] And / or, a second transition fillet is formed between the bottom wall and the sidewall of the score portion, and the radius of the second transition fillet is R4, which satisfies: R4 < A0, where A0 is the recess depth of the score portion.

[0022] In an alternative embodiment, the length of the score portion along the length direction is L0, which satisfies: 0mm < L0 ≤ L, where L is the length of the shell structure along the length direction.

[0023] Beneficial effects: By reasonably designing the parameters of the score portion, the strength and durability of the shell structure under normal use conditions are ensured.

[0024] In an alternative embodiment, the score portion is formed at the middle position of the shell structure along the length direction;

[0025] Or, the number of score portions is multiple, and they are distributed at the two side positions of the shell structure along the length direction;

[0026] Or, the score portion is formed at one side position of the shell structure along the length direction;

[0027] Or, the score portion is provided through the shell structure along the length direction.

[0028] Beneficial effects: By making the length of the score part in the length direction L0, and satisfying: 0mm < L0≤L, the pressure relief valve of the shell structure can be ensured to be in the area in the length direction, the pressure relief length is facilitated to be controlled, that is, the pressure relief area is facilitated to be controlled, and the exhaust is more smooth. Avoid the situation that the high-temperature gas needs to move a long distance along the length direction of the shell to reach the explosion-proof valve, avoid the exhaust path being too long, reduce the probability of blockage, can reasonably utilize the length advantage of the shell structure, and ensure the exhaust area.

[0029] In an optional embodiment, the number of score parts includes one or more.

[0030] Beneficial effects: The number of score parts can also be one or more to adapt to the needs of different application scenarios.

[0031] In a second aspect, the utility model also provides a battery, including the shell structure as above, the shell structure forms the opening part along at least one end in the length direction;

[0032] The battery also includes a cover plate, and the cover plate is arranged on the opening part.

[0033] Because the battery includes the shell structure, has the same effect as the shell structure, and will not be repeated here.

[0034] In a third aspect, the utility model also provides a battery pack, including at least two batteries as above arranged side by side in the width direction;

[0035] The outer surfaces of the adjacent two batteries close to each other in the width direction and located in the region of the connecting surface form an exhaust cavity;

[0036] The shell structure has a burst-open state along the score part, and the shell structure forms a burst-open part in the burst-open state.

[0037] The inside of the shell structure is communicated with the exhaust cavity through the burst-open part.

[0038] Beneficial effects: the battery pack provided by the embodiment of the utility model, the outer surfaces of the adjacent batteries form an exhaust cavity in the connecting surface region, for collecting and guiding the gas generated due to thermal runaway of a single battery. When the shell structure bursts along the score part, the burst-open part formed makes the inside of the shell communicate with the exhaust cavity, effectively releases the pressure, prevents the thermal runaway from spreading to the entire battery pack, and improves the overall safety. The exhaust cavity formed by the outer surfaces of the adjacent batteries in the connecting surface region can be fully utilized, so that the explosion-proof valve has sufficient valve opening space, avoids the situation that the valve opening area is blocked, and ensures smooth valve opening. And the single battery can use the connecting surface region of the adjacent battery when opening the valve, so that the valve opening space is more sufficient, and the heat of the runaway battery is removed more quickly.

[0039] In a fourth aspect, the utility model also provides a kind of electric equipment, including battery pack as above.

[0040] Because electric equipment includes battery pack, with the same effect of battery pack, here no longer repeat. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the embodiment of the utility model or the technical scheme in prior art, the drawings needed in the embodiment or prior art description will be simply introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor according to these drawings.

[0042] Figure 1 It is the schematic view of shell structure of the utility model;

[0043] Figure 2 It is Figure 1 The schematic view of M-M section in;

[0044] Figure 3 It is Figure 2 The enlarged view of A in;

[0045] Figure 4 It is Figure 3 The enlarged view of C in;

[0046] Figure 5 It is Figure 2 The enlarged view of B in;

[0047] Figure 6 It is the sectional view of shell structure of the utility model in burst open state;

[0048] Figure 7 It is Figure 6 The enlarged view of D in;

[0049] Figure 8 It is the schematic view of multiple shell bodies side by side arrangement;

[0050] Figure 9 It is Figure 8 The enlarged view of E in.

[0051] BRIEF DESCRIPTION OF DRAWINGS

[0052] 1, shell structure; 101, inner surface; 102, outer surface; 2, exhaust cavity;

[0053] 11, first shell surface; 12, second shell surface; 13, connecting surface; 14, weld; 15, burst open part; 16, opening part; 17, score part; 103, first transition fillet; 104, second transition fillet. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0055] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0056] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0058] The shape of the blade battery is long and thin, which usually includes a shell and a cover plate, the shell is formed in a cylindrical form by surrounding a metal plate around, two ends or one end of the shell is formed with an opening, and the cover plate is arranged at the opening position of the shell. Among them, the opening is often arranged at two ends or one end of the shell along the length direction.

[0059] The blade battery generally comprises a shell and a cover plate, the shell is formed with an opening part at least at one end in the length direction, and the cover plate is arranged at the opening part. In the related art, the explosion-proof valve of the blade battery is arranged on the cover plate. However, because the blade battery is long in the length direction, when thermal runaway occurs, the high-temperature gas needs to move a long distance along the length direction of the shell to reach the explosion-proof valve, the long exhaust path is prone to be blocked, and the explosion-proof valve arranged on the cover plate is limited in size due to the space layout, so that the size of the explosion-proof valve cannot be increased, and when thermal runaway occurs, the overall exhaust is prone to be not smooth, which is prone to cause the shell explosion.

[0060] The embodiments of the utility model will be described below in combination with Figures 1 to 9 The embodiments of the utility model will be described below in combination with

[0061] According to the embodiments of the utility model, on the one hand, a shell structure is provided, which is constructed in a cylindrical shape, and the shell structure is formed with an opening part 16 at least at one end in the length direction; the shell structure at least comprises:

[0062] The first shell surface 11 and the second shell surface 12, and the connecting surface 13 connecting the first shell surface 11 and the second shell surface 12;

[0063] The first shell surface 11 and the second shell surface 12 are arranged at an angle, and the planes where the first shell surface 11 and the second shell surface 12 are located are parallel to the length direction of the shell structure;

[0064] The connecting surface 13 is constructed in an arc shape, and the connecting surface 13 is locally recessed to form a notch part 17.

[0065] The shell structure 1 of the embodiments is constructed in a cylindrical shape, which can be made of a metal plate through stamping, winding, welding and other processes.

[0066] The notch part 17 can be formed by laser marking, mechanical processing or chemical etching.

[0067] It should be noted that the shell structure 1 can be a triangular structure or a rectangular structure or a trapezoidal structure or a pentagonal structure or other polygonal structures; the embodiments take the rectangular structure of the shell structure 1 as an example for description. In the embodiments, the shell structure is constructed in a cylindrical shape, which means a structure with a side wall and an internal cavity, or a structure with a side wall and a bottom wall and an internal cavity, for example, a triangular cylinder, a square cylinder, a circular cylinder, a polygonal cylinder, etc.

[0068] The shell structure is formed with an opening part 16 at least at one end in the length direction, and specifically, the shell structure can be formed with an opening part 16 at both ends in the length direction, and the cover plate is arranged at the opening part 16, so as to form a closed battery shell together with the shell structure, and the battery shell is suitable for placing the battery cell.

[0069] The first shell surface 11 and the second shell surface 12 of the shell structure are surfaces of adjacent plates, and the first shell surface 11 and the second shell surface 12 are connected through the connecting surface 13.

[0070] In some embodiments, taking the shell structure 1 in a rectangular structure as an example, the shell structure includes two first shell surfaces 11 arranged opposite in the height direction and two second shell surfaces 12 arranged opposite in the width direction; the connecting surface 13 is formed between adjacent first shell surfaces 11 and second shell surfaces 12.

[0071] The length direction, the width direction, and the height direction are perpendicular to each other.

[0072] In this embodiment, the first shell surface 11 is a plate surface parallel to the length direction and the width direction, and the second shell surface 12 is a plate surface parallel to the length direction and the height direction. That is, the first shell surface 11 and the second shell surface 12 are arranged at a right angle.

[0073] The connecting surface 13 in this embodiment is configured as an arc surface, and the notch portion 17 is formed by locally recessing the connecting surface 13, so that the notch portion 17 can serve as a predetermined breaking point. In the case of battery thermal runaway, the internal high-pressure gas will push the shell structure to break along the notch portion 17 and quickly release the pressure to prevent explosion.

[0074] The shell structure provided by the embodiment of the utility model, by locally recessing the connecting surface 13 to form the notch portion 17, the notch portion 17 serves as the explosion-proof valve, and because the connecting surface 13 has high strength, the strength of the periphery of the explosion-proof valve can be improved, and the stability of the shell structure when the valve is opened can be increased. Moreover, because the connecting surface 13 connects the first shell surface 11 and the second shell surface 12, and the first shell surface 11 and the second shell surface 12 are parallel to the length direction of the shell structure, that is, the connecting surface 13 is also parallel to the length direction of the shell structure, the notch portion 17 is arranged on the connecting surface 13, in the case of battery thermal runaway, the internal high-pressure gas only needs to move in the height direction or the width direction, avoiding the situation that the high-temperature gas needs to move a long distance in the length direction of the shell to reach the explosion-proof valve, avoiding a long exhaust path, reducing the probability of blockage, reasonably utilizing the length advantage of the shell structure, and ensuring the exhaust area. In addition, compared with the related art, the explosion-proof valve is transferred from the cover plate to the shell structure, the space utilization rate of the cover plate can be improved, and because the explosion-proof valve is at the position of the connecting surface 13, the space in the R corner region of the shell structure can be reasonably utilized, without wasting the valuable space of the battery, which is conducive to improving the energy density of the battery.

[0075] In some embodiments, in combination with Figure 3 As shown in the figure, the notch portion 17 is formed at a position of the connecting surface 13 close to the first shell surface 11.

[0076] The shell structure has an open state where it bursts open along the notch 17, and in the open state, the shell structure has an open portion 15. (Combined) Figure 7 As shown, when the first shell surface 11 of the shell structure 1 near the etched portion 17 is the bottom surface of the battery, by forming the etched portion 17 on the connecting surface 13 near the first shell surface 11, when the bursting portion 15 is formed, the plate of the connecting surface 13 is more connected to the second shell surface 12, which can guide the exhaust direction of the bursting portion 15 toward the bottom of the shell structure, thereby better controlling the pressure relief direction or area and making the bursting direction more reasonable.

[0077] As a variation, the notch 17 can also be formed on the connecting surface 13 near the second shell surface 12, or the notch 17 can also be formed on the connecting surface 13 at a position relatively midway between the first shell surface 11 and the second shell surface 12. The specific location can be reasonably determined according to the actual requirements of the battery's pressure relief direction.

[0078] In some embodiments, combined with Figure 5 As shown, the shell structure has a weld 14, and the score portion 17 and the weld 14 are located on both sides of the shell structure along the height direction, or the score portion 17 and the weld 14 are located on both sides of the shell structure along the width direction.

[0079] Since the shell structure 1 is made of metal sheet through processes such as stamping, winding and welding, a weld 14 will be formed in the shell structure 1 after the welding process is completed.

[0080] Since weld 14 is a stress concentration area, by setting the etched portion 17 and weld 14 far apart from each other in the height or width direction, it is possible to avoid the stress of weld 14 affecting the valve opening pressure of etched portion 17, thus ensuring the valve opening stability of housing structure 1, ensuring welding quality, and avoiding mutual interference between etched portion 17 and weld 14.

[0081] In this embodiment, the etched portion 17 is disposed at the bottom of the shell structure along the height direction, specifically at the connecting surface 13 at the bottom of the shell structure along the height direction; correspondingly, the weld 14 is disposed at the top of the shell structure along the height direction, specifically at the first shell surface 11 at the top of the shell structure along the height direction.

[0082] In some embodiments, the housing structure has an inner surface 101 facing the interior of the cylindrical shape and an outer surface 102 facing the exterior of the cylindrical shape, and the grooved portion 17 is formed by recessing from the inner surface 101 toward the outer surface 102.

[0083] By recessing the grooved portion 17 from the inner surface 101 toward the outer surface 102, the integrity of the shell structure's appearance is ensured. In the event of battery thermal runaway, the internal high-pressure gas can directly act on the grooved portion 17, which is beneficial to improving valve opening efficiency and ensuring stable valve opening pressure.

[0084] As a variant, the score portion 17 can also be concave from the outer surface 102 toward the inner surface 101.

[0085] In some embodiments, in combination with Figure 4 As shown, the score portion 17 has a concave depth A0, which satisfies: 0mm < A0 < T0, where T0 is the wall thickness of the shell structure.

[0086] And / or, the score portion 17 has a width B0, which satisfies: B0 < R1, where R1 is the radius of the inner surface 101 of the connecting surface 13.

[0087] For example, when the wall thickness T0 of the shell structure is 2mm, the concave depth A0 of the score portion 17 can be 0.1mm or 0.2mm or 0.3mm or 0.5mm or 0.7mm or 0.9mm or 1mm or 1.2mm or 1.3mm or 1.5mm, etc.

[0088] For example, if R1 is 5mm, B0 can be selected as 1mm or 2mm or 4mm, etc.

[0089] In some embodiments, a first transition round corner 103 is formed between the sidewall of the score portion 17 and the inner surface 101, and the radius of the first transition round corner 103 satisfies: R3 > 0mm.

[0090] And / or, a second transition round corner 104 is formed between the bottom wall and the sidewall of the score portion 17 away from the inner surface 101, and the radius of the second transition round corner 104 satisfies: R4 < A0, where A0 is the concave depth of the score portion 17.

[0091] The first transition round corner 103 between the score portion 17 and the inner surface 101 reduces stress concentration.

[0092] The second transition round corner 104 at the bottom of the score portion 17 away from the inner surface 101 helps to control the breaking path and improve safety.

[0093] By reasonably designing the parameters and positions of the score portion 17, the strength and durability of the shell structure under normal use conditions are ensured.

[0094] In some embodiments, the length of the score portion 17 along the length direction is L0, which satisfies: 0mm < L0 ≤ L, where L is the length of the shell structure along the length direction.

[0095] By setting the length of the score part 17 along the length direction as L0, and satisfying: 0mm < L0≤L, the length direction area of the pressure relief valve of the shell structure can be ensured, the pressure relief length is facilitated to be controlled, that is, the pressure relief area is facilitated to be controlled, so that the exhaust is more smooth. The situation that the high-temperature gas needs to move a long distance along the length direction of the shell to reach the explosion-proof valve is avoided, the exhaust path is not too long, the probability of blockage is reduced, the length advantage of the shell structure can be reasonably utilized, and the exhaust area is ensured.

[0096] In some embodiments, the score part 17 is formed at a middle position of the shell structure along the length direction;

[0097] Or, the number of score parts 17 is multiple, and is distributed at both side positions of the shell structure along the length direction;

[0098] Or, the score part 17 is formed at one side position of the shell structure along the length direction;

[0099] Or, the score part 17 is provided through the shell structure along the length direction.

[0100] In the embodiment, the score part 17 is preferably formed at a middle position of the shell structure along the length direction.

[0101] In some embodiments, the number of score parts 17 includes one or more.

[0102] The number of score parts 17 can be multiple score parts 17 provided on the same connecting surface 13, or at least one score part 17 provided on different connecting surfaces 13.

[0103] For example, when multiple score parts 17 are provided on the same connecting surface 13, the multiple score parts 17 can be parallel to the length direction.

[0104] The length of the score part can be flexibly set according to actual needs. The setting position of the score part can be formed at a middle position, both side positions or one side position of the shell structure, or even can be provided through the length direction. The number of score parts can be one or more, to adapt to the needs of different application scenarios.

[0105] According to the embodiments of the utility model, on the other hand, a battery is also provided, including the shell structure as described above, at least one end of the shell structure along the length direction forms an opening part 16;

[0106] The battery further includes a cover plate, which is covered on the opening part 16.

[0107] The opening part 16 is sealed by the cover plate, so that the battery forms a closed internal space for accommodating key components such as battery cells.

[0108] The battery of the embodiment can be applied to scenarios such as electric vehicles, electric bicycles, electric aircrafts, and the like, which require high safety and reliability. It can also be applied to scenarios such as household energy storage, industrial energy storage, and the like, to ensure that the battery pack can operate safely under abnormal conditions.

[0109] According to the embodiment of the utility model, still one aspect further provides a battery pack, include: at least two along the width direction side by side set up as above-mentioned battery;

[0110] The outer surfaces 102 of the two adjacent batteries are close to each other along the width direction, and the exhaust cavity 2 is formed in the region of the connecting surface 13.

[0111] The shell structure has a burst state along the score part 17, and the burst part 15 is formed in the burst state.

[0112] The inside of the shell structure is communicated with the exhaust cavity 2 through the burst part 15.

[0113] The battery pack provided by the embodiment of the utility model forms the exhaust cavity 2 in the connecting surface region of the outer surfaces of adjacent batteries, which is used for collecting and guiding the gas generated due to thermal runaway of a single battery. When the shell structure bursts along the score part 17, the burst part 15 formed makes the inside of the shell communicated with the exhaust cavity 2, effectively releases the pressure, prevents the thermal runaway from spreading to the entire battery pack, and improves the overall safety. The exhaust cavity 2 formed in the connecting surface region of the outer surfaces of adjacent batteries can be fully utilized, so that the explosion-proof valve has sufficient valve opening space, avoids the situation that the valve opening region is blocked, and ensures smooth valve opening. Moreover, the single battery can use the connecting surface region of the adjacent battery when opening the valve, so that the valve opening space is more sufficient, and the heat of the out-of-control battery is removed more quickly.

[0114] In combination with Figure 9 As shown in the figure, in the embodiment, the valve opening direction of the battery pack is downward, which avoids the smoke and fire invading the member compartment and improves the safety.

[0115] According to the embodiment of the utility model, still one aspect further provides a power consumption equipment, including as above-mentioned battery pack.

[0116] The power consumption equipment of the embodiment can be an electric vehicle, an electric bicycle, an electric aircraft, and the like. It can also be a household energy storage device, an industrial energy storage device, and the like, to ensure that the power consumption equipment can operate safely.

[0117] Obviously, the above embodiments are only examples for clearly illustrating, rather than limiting the embodiments. Although the embodiments of the utility model are described in combination with the drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the utility model, and such modifications and variations all fall within the scope defined by the utility model.

Claims

1. A shell structure, characterized in that, The shell structure is cylindrical, with an opening (16) at at least one end along its length; the shell structure includes at least: The first shell surface (11) and the second shell surface (12), and the connecting surface (13) connecting the first shell surface (11) and the second shell surface (12); The first shell surface (11) and the second shell surface (12) are set at an angle, and the planes containing the first shell surface (11) and the second shell surface (12) are parallel to the length direction of the shell structure. The connecting surface (13) is constructed as an arc-shaped surface, and the connecting surface (13) is partially recessed to form a grooved portion (17).

2. The shell structure according to claim 1, characterized in that, The shell structure includes two first shell surfaces (11) arranged opposite each other along the height direction, and two second shell surfaces (12) arranged opposite each other along the width direction; a connecting surface (13) is formed between adjacent first shell surfaces (11) and second shell surfaces (12); The length direction, the width direction, and the height direction are all perpendicular to each other.

3. The shell structure according to claim 2, characterized in that, The groove (17) is formed on the connecting surface (13) near the first shell surface (11).

4. The shell structure according to claim 2, characterized in that, The shell structure has a weld (14), and the notched portion (17) and the weld (14) are located on both sides of the shell structure along the height direction, or the notched portion (17) and the weld (14) are located on both sides of the shell structure along the width direction.

5. The shell structure according to claim 1, characterized in that, The shell structure has an inner surface (101) facing the interior of the cylindrical shape and an outer surface (102) facing the exterior of the cylindrical shape, and the grooved portion (17) is formed by the inner surface (101) being recessed towards the outer surface (102).

6. The shell structure according to claim 5, characterized in that, The recess depth of the etched portion (17) is A0, which satisfies: 0mm < A0 < T0, where T0 is the wall thickness of the shell structure; And / or, the width of the groove (17) is B0, satisfying: B0 < R1, where R1 is the radius of the inner surface (101) of the connecting surface (13).

7. The shell structure according to claim 5, characterized in that, A first transition fillet (103) is formed between the sidewall of the etched portion (17) and the inner surface (101), and the radius of the first transition fillet (103) is R3, satisfying: R3 > 0 mm; And / or, the bottom wall and side wall of the etched portion (17) form a second transition fillet (104), the radius of the second transition fillet (104) is R4, satisfying: R4 < A0, where A0 is the recess depth of the etched portion (17).

8. The shell structure according to any one of claims 1 to 7, characterized in that, The length of the grooved portion (17) along the length direction is L0, which satisfies: 0mm<L0≤L, where L is the length of the shell structure along the length direction.

9. The shell structure according to any one of claims 1 to 7, characterized in that, The notched portion (17) is formed at the middle position of the shell structure along the length direction; Alternatively, the number of the notched portions (17) is multiple, distributed on both sides of the shell structure along the length direction; Alternatively, the notched portion (17) is formed on one side of the housing structure along the length direction; Alternatively, the notched portion (17) is disposed through the shell structure along the length direction.

10. The shell structure according to any one of claims 1 to 7, characterized in that, The number of the notched portions (17) may include one or more.

11. A battery, characterized in that, Includes a shell structure as described in any one of claims 1 to 10 above, wherein at least one end of the shell structure along the length direction forms an opening (16); The battery also includes a cover plate that covers the opening (16).

12. A battery pack, characterized in that, It includes at least two batteries arranged side by side along the width direction as described in claim 11 above; An exhaust chamber (2) is formed on the outer surface (102) of two adjacent batteries that are close to each other in the width direction and in the region located on the connecting surface (13); The shell structure has an open state that bursts open along the groove (17), and in the open state, the shell structure forms an open portion (15); The interior of the shell structure is connected to the exhaust chamber (2) via the bursting part (15).

13. An electrical appliance, characterized in that, Includes the battery pack as described in claim 12 above.

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