Battery and electric equipment

Abstract

The invention relates to the technical field of electric equipment, and discloses a battery and electric equipment, the battery comprises: a housing in which a mounting cavity is formed; the battery cell is arranged in the mounting cavity; the anti-explosion valve is arranged on the first shell surface of the shell, and a gas storage cavity is formed in the area between the anti-explosion valve and the battery cell; the flow slowing structure is formed on the first shell surface of the shell and is provided with a flow slowing channel suitable for guiding a medium to flow; from the head end to the tail end of the flow slowing structure, the flow slowing structure is suitable for slowing down the flow speed of the medium; and the tail end of the slow flow structure is communicated with the gas storage cavity. According to the battery provided by the invention, when thermal runaway occurs in the battery and a large amount of high-heat medium is rapidly generated in the battery, the slow flow structure can guide airflow of the high-heat medium and slow down the flow velocity of the airflow of the high-heat medium, so that the large amount of high-heat medium is prevented from intensively rushing into the air storage cavity, and the explosion-proof valve is prevented from being impacted by instantaneous large airflow; therefore, the anti-explosion valve is prevented from being opened in advance, and the valve opening stability of the anti-explosion valve is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and particularly relates to a battery and an electrical equipment. Background Art

[0002] A battery is usually provided with an explosion-proof valve. When a chemical reaction occurs inside the battery due to overvoltage or abnormal temperature rise and a large amount of gas is generated, the explosion-proof valve will be pressed to open, quickly releasing the high-pressure gas inside, thereby preventing the battery from exploding.

[0003] However, in the related art, when the battery undergoes thermal runaway, the explosion-proof valve is easily impacted by a large instantaneous airflow, causing the explosion-proof valve to open in advance, resulting in poor opening stability of the explosion-proof valve. Summary of the Invention

[0004] In view of this, the present invention provides a battery and an electrical equipment to solve the problem that the explosion-proof valve is easily impacted by a large instantaneous airflow, causing the explosion-proof valve to open in advance and resulting in poor opening stability.

[0005] In a first aspect, the present invention provides a battery, including:

[0006] A housing, within which an installation cavity is formed;

[0007] An electric core, disposed in the installation cavity;

[0008] An explosion-proof valve, disposed on a first shell surface of the housing, and a gas storage cavity is formed in the region between the explosion-proof valve and the electric core;

[0009] A flow buffering structure, formed on the first shell surface of the housing, the flow buffering structure having a flow buffering channel adapted to guide the flow of a medium; from the head end to the tail end of the flow buffering structure, the flow buffering structure is adapted to slow down the flow rate of the medium; the tail end of the flow buffering structure is connected to the gas storage cavity.

[0010] Advantageous Effects: The battery provided by the embodiment of the present invention, by providing a flow buffering structure, the flow buffering structure having a flow buffering channel adapted to guide the flow of a medium; from the head end to the tail end of the flow buffering structure, the flow buffering structure is adapted to slow down the flow rate of the medium; the tail end of the flow buffering structure is connected to the gas storage cavity, so that when the battery undergoes thermal runaway and a large amount of high-temperature medium is rapidly generated inside, the flow buffering structure can guide the airflow of the high-temperature medium, slow down the flow rate of the airflow of the high-temperature medium, avoid a large amount of high-temperature medium concentrating on the gas storage cavity, prevent the explosion-proof valve from being impacted by a large instantaneous airflow, and thus avoid causing the explosion-proof valve to open in advance, improving the opening stability of the explosion-proof valve.

[0011] In an optional embodiment, the housing has an inner surface facing the installation cavity, and the flow buffering channel is formed by a partial depression of the inner surface of the housing.

[0012] Beneficial effects: For the battery provided by the embodiment of the present invention, since the flow retardation channel is formed by a partial depression of the inner surface of the housing, after the battery cell is installed inside the housing, even if the battery cell abuts against the inner surface of the housing, it can be ensured that the flow retardation channel is not blocked, which is convenient for using the flow retardation channel as an exhaust channel. And since the end of the flow retardation channel is communicated with the gas storage cavity, it is ensured that the airflow of the high-temperature medium can smoothly flow to the gas storage cavity, ensuring smooth overall exhaust, thereby avoiding causing the housing to explode, reducing the possibility of explosion, and improving the safety performance of the battery.

[0013] In an optional embodiment, the flow retardation structure includes at least one flow retardation sub-unit, and each flow retardation sub-unit includes a diversion island. In the direction from the head end to the tail end of the flow retardation structure, the diversion island is adapted to divide the flow retardation channel in a flow retardation sub-unit into a main channel and a tributary channel, and the tributary channel includes a downstream channel section and an upstream channel section;

[0014] The first end of the downstream channel section is communicated with the first end of the main channel, and along the flow direction of the medium, the included angle between the first end of the downstream channel section and the first end of the main channel is a, satisfying a < 90°; the first end of the upstream channel section is communicated with the second end of the downstream channel section, the second end of the upstream channel section is communicated with the second end of the main channel, and along the flow direction of the medium, the included angle between the second end of the upstream channel section and the second end of the main channel is b, satisfying 90° < b < 180°.

[0015] Beneficial effects: The first end of the downstream channel section is communicated with the first end of the main channel, and along the flow direction of the medium, the included angle between the first end of the downstream channel section and the first end of the main channel is a, satisfying a < 90°; when the high-temperature medium flows to the downstream channel section, it will be diverted, and a part of it flows along the main channel, and the other part is diverted to the downstream channel section.

[0016] The first end of the upstream channel section is communicated with the second end of the downstream channel section, and the high-temperature medium entering the downstream channel section enters the upstream channel section along the path of the tributary channel. Also, since the second end of the upstream channel section is communicated with the second end of the main channel, and along the flow direction of the medium, the included angle between the second end of the upstream channel section and the second end of the main channel is b, satisfying 90° < b < 180°, so that the high-temperature medium flowing out of the upstream channel section will collide with the high-temperature medium in the main channel. Due to the mutual impact of the two airflows, the deceleration effect is achieved, that is, the flow velocity of the high-temperature medium flowing through the flow retardation structure is slowed down. The end of the flow retardation structure is communicated with the gas storage cavity, thereby reducing the flow velocity of the high-temperature medium entering the gas storage cavity, avoiding the impact of instantaneous large airflow on the explosion-proof valve, preventing the explosion-proof valve from being torn extremely quickly by the instantaneous large pressure, preventing an approximate explosion situation from occurring, and avoiding the overall flying out of the explosion-proof sheet of the explosion-proof valve. When the explosion-proof valve reaches the opening pressure, it can be smoothly torn from the weak area, avoiding the premature opening of the explosion-proof valve and improving the opening stability of the explosion-proof valve.

[0017] In an alternative embodiment, the residual thickness of the explosion-proof valve in the direction perpendicular to the first shell surface is T1, satisfying: 0.001×T3 ≤ T1 ≤ 1×T3, where T3 is the wall thickness of the shell.

[0018] Beneficial effects: By restricting the residual thickness T1 of the explosion-proof valve in the direction perpendicular to the first shell surface to be less than T3, it is possible to prevent the explosion-proof valve from protruding beyond the outer surface of the shell and prevent accidental rubbing of the explosion-proof valve. By restricting the residual thickness T1 of the explosion-proof valve in the direction perpendicular to the first shell surface to be greater than 0.001×T3, the thickness of the explosion-proof valve can be ensured, and the structural strength of the explosion-proof valve can be guaranteed.

[0019] In an alternative embodiment, the depth of the flow buffering structure in the direction perpendicular to the first shell surface is T2, satisfying: 0.001×T3 ≤ T2 ≤ 2×T3, where T3 is the wall thickness of the shell.

[0020] Beneficial effects: By restricting the depth T2 of the flow buffering structure in the direction perpendicular to the first shell surface to be greater than 0.001×T3, it is possible to ensure that the flow buffering channel is not blocked, facilitating the use of the flow buffering channel as an exhaust channel. By restricting the depth T2 of the flow buffering structure in the direction perpendicular to the first shell surface to be less than 2×T3, it is possible to avoid the flow buffering structure occupying too much space while meeting the exhaust requirements, ensuring the energy density of the battery.

[0021] In an alternative embodiment, the number of the flow buffering structures is at least one.

[0022] In an alternative embodiment, the number of the flow buffering structures is two; along the length direction of the battery, the two flow buffering structures are respectively arranged on both sides of the explosion-proof valve.

[0023] Beneficial effects: Along the length direction of the battery, the two flow buffering structures are respectively arranged on both sides of the explosion-proof valve, so as to ensure that the flow buffering structures on both sides of the explosion-proof valve can simultaneously play the role of slowing down the flow rate of the medium. And arranging the two flow buffering structures on both sides of the explosion-proof valve along the length direction of the battery can reasonably utilize the space in the length direction, ensure the length of the flow buffering structure, and further ensure the effect of slowing down the flow rate of the medium.

[0024] In an alternative embodiment, the two flow buffering structures are symmetrically arranged with respect to the central axis of the explosion-proof valve along the length direction.

[0025] Beneficial effects: By symmetrically arranging the two flow buffering structures with respect to the central axis of the explosion-proof valve along the length direction, the two flow buffering structures can achieve the same deceleration effect, avoiding the situation of larger flow rate on one side, so as to further ensure that the air flow of the high-temperature medium entering the gas storage cavity will not have a situation of excessive pressure on one side, avoid uneven stress, and ensure the opening valve stability of the explosion-proof valve.

[0026] In an alternative embodiment, the distance between the leading end of the flow retardation structure and the edge of the adjacent housing along the length direction of the battery is L, satisfying: 0 mm ≤ L ≤ L0, where L0 is the distance between the edge of the explosion-proof valve along the length direction of the battery and the edge of the housing on the same side.

[0027] Beneficial effects: It is convenient to select the appropriate length of the flow retardation structure according to batteries of different specifications and models, so as to ensure that the flow retardation structure can guide the airflow of the high-temperature medium, slow down the flow rate of the airflow of the high-temperature medium to an appropriate speed, and facilitate subsequent valve opening.

[0028] In a second aspect, the present invention further provides an electrical device, including: the battery as described above.

[0029] Since the electrical device includes the battery and has the same effects as the battery, they will not be elaborated here. Description of the Drawings

[0030] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is the front view of the housing of the present invention;

[0032] Figure 2 It is Figure 1 the schematic diagram of the A-A cross-section in

[0033] Figure 3 It is Figure 1 the schematic diagram of the B-B cross-section in

[0034] Figure 4 It is Figure 3 the enlarged view at C in

[0035] Figure 5 It is the schematic diagram of the flow retardation structure of the present invention;

[0036] Figure 6 It is the cross-sectional view of the battery of the present invention;

[0037] Figure 7 It is Figure 6 the enlarged view at D in

[0038] Description of the reference numerals:

[0039] 1. Housing; 101. Inner surface; 102. Outer surface;

[0040] 11. First shell surface; 12. Installation cavity;

[0041] 13. Explosion-proof valve; 14. Gas storage cavity; 15. Flow-attenuating structure; 16. Flow-attenuating channel; 17. Shunt island;

[0042] 161. Main channel; 162. Branch channel; 1621. Downstream channel section; 1622. Upstream channel section;

[0043] 2. Battery cell. Detailed implementation manners

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] A battery is usually provided with an explosion-proof valve. When a chemical reaction occurs inside the battery due to overvoltage or abnormal temperature rise, generating a large amount of gas, the explosion-proof valve will be pressed to open, quickly releasing the high-pressure gas inside, thereby preventing the battery from exploding. However, in related technologies, when the battery undergoes thermal runaway, a large amount of gas is rapidly generated inside the battery, and the explosion-proof valve is easily impacted by a large instantaneous airflow, causing the explosion-proof valve to open in advance, resulting in poor opening stability of the explosion-proof valve. In addition, in related technologies, the explosion-proof valve of the battery is mostly arranged on the cover plate. Due to space layout limitations, the area of the explosion-proof valve arranged on the cover plate is limited, making the size of the explosion-proof valve unable to be enlarged, and it is easy to cause unsmooth overall exhaust during thermal runaway, easily leading to the case of the battery casing bursting.

[0049] The following will describe embodiments of the present invention in conjunction with Figures 1 to 7 .

[0050] According to an embodiment of the present invention, on the one hand, a battery is provided, including:

[0051] A housing 1, within which an installation cavity 12 is formed;

[0052] A battery cell 2, arranged within the installation cavity 12;

[0053] An explosion-proof valve 13, arranged on the first shell surface 11 of the housing 1, and a gas storage cavity 14 is formed in the region between the explosion-proof valve 13 and the battery cell 2;

[0054] A flow buffering structure 15, formed on the first shell surface 11 of the housing 1, the flow buffering structure 15 having a flow buffering channel 16 suitable for guiding the flow of the medium; from the head end to the tail end of the flow buffering structure 15, the flow buffering structure 15 is suitable for slowing down the flow rate of the medium; the tail end of the flow buffering structure 15 is connected to the gas storage cavity 14.

[0055] The housing 1 of this embodiment may specifically include a housing body and a cover plate. Among them, the housing body is configured as a cylindrical shape, and at least one end of the housing body in the length direction forms an opening, specifically, both ends of the housing body in the length direction may form openings, and the cover plate is covered at the opening, so as to jointly enclose a closed housing 1 with the housing body. An installation cavity 12 is formed inside the housing 1, and the housing 1 is suitable for placing the battery cell 2.

[0056] The housing body can be made from a metal plate through processes such as stamping, winding, and welding.

[0057] The housing 1 can be a triangular structure or a rectangular structure or a trapezoidal structure or a pentagonal structure or other polygonal structures; in this embodiment, the housing 1 is taken as an example of a rectangular structure for illustration.

[0058] The explosion-proof valve 13 is disposed on the first shell surface 11 of the housing 1. Specifically, the first shell surface 11 can be one of the side surfaces of the shell body, and the first shell surface 11 can also be a cover plate. Preferably, in this embodiment, the first shell surface 11 refers to one of the side surfaces of the shell body. By transferring the explosion-proof valve 13 from the cover plate to the shell body, the space utilization rate of the cover plate can be improved, which is convenient for the spatial design and layout of the cover plate, and the surface area of the shell body can be reasonably utilized to ensure the opening area of the explosion-proof valve 13 and improve the situation of battery shell explosion.

[0059] The structural form of the explosion-proof valve 13 can also be various. For example, an explosion-proof valve installation hole is formed on the first shell surface 11 of the housing 1, and the explosion-proof valve 13 can be installed at the position of the explosion-proof valve installation hole on the first shell surface 11 by welding. Another example is that the explosion-proof valve 13 can be formed by enclosing the scored part that is locally thinned on the first shell surface 11 of the housing 1. Among them, the scored part can be formed by laser scoring, machining or chemical etching.

[0060] Combined with Figure 7 As shown, a gas storage cavity 14 is formed in the area between the explosion-proof valve 13 and the battery cell 2. The battery cell 2 is disposed in the installation cavity 12. When thermal runaway occurs, the high-temperature medium will flow along the gap between the battery cell 2 and the housing 1 and enter the gas storage cavity 14. Then, when the pressure is greater than the opening pressure of the explosion-proof valve 13, the explosion-proof valve 13 will be opened. A large amount of high-temperature medium is rapidly generated inside the battery. If not guided, when a large amount of high-temperature medium rushes towards the gas storage cavity 14, the explosion-proof valve 13 is easily impacted by a large instantaneous airflow, causing the explosion-proof valve to open in advance, resulting in poor opening stability of the explosion-proof valve.

[0061] The battery provided by the embodiment of the present invention is provided with a flow buffering structure 15. The flow buffering structure 15 has a flow buffering channel 16 suitable for guiding the flow of the medium; from the head end to the tail end of the flow buffering structure 15, the flow buffering structure 15 is suitable for slowing down the flow rate of the medium; the tail end of the flow buffering structure 15 is communicated with the gas storage cavity 14. Thus, when thermal runaway occurs in the battery and a large amount of high-temperature medium is rapidly generated inside, the flow buffering structure 15 can guide the airflow of the high-temperature medium, slow down the flow rate of the airflow of the high-temperature medium, avoid a large amount of high-temperature medium rushing towards the gas storage cavity 14, prevent the explosion-proof valve 13 from being impacted by a large instantaneous airflow, and thus avoid causing the explosion-proof valve to open in advance and improve the opening stability of the explosion-proof valve.

[0062] In some embodiments, the housing 1 has an inner surface 101 facing the installation cavity 12, and the flow buffering channel 16 is formed by a local depression of the inner surface 101 of the housing 1.

[0063] The flow buffering channel 16 is formed by a local depression of the inner surface 101 of the housing 1, that is, the flow buffering channel 16 is depressed from the inner surface 101 of the first shell surface 11 in a direction away from the battery cell 2.

[0064] Since the high-temperature medium needs to flow along the gap between the battery cell 2 and the housing 1, after the battery cell 2 is installed inside the housing 1, due to factors such as machining errors or battery cell expansion, it is easy for the battery cell 2 to be in contact with the inner surface 101 of the housing 1. At this time, the gap between the battery cell 2 and the inner surface 101 of the housing 1 is relatively narrow, and it is easy to cause blockage of the exhaust passage, resulting in unsmooth overall exhaust.

[0065] The battery provided by the embodiment of the present invention enables the slow-flow channel 16 to be formed by a partial depression of the inner surface 101 of the housing 1. Thus, after the battery cell 2 is installed inside the housing 1, even if the battery cell 2 is in contact with the inner surface 101 of the housing 1, it can be ensured that the slow-flow channel 16 is not blocked, facilitating the use of the slow-flow channel 16 as an exhaust passage. And since the end of the slow-flow channel 16 is connected to the gas storage cavity 14, it is ensured that the airflow of the high-temperature medium can smoothly flow to the gas storage cavity 14, ensuring smooth overall exhaust, thereby avoiding causing the housing to explode, reducing the possibility of explosion, and improving the safety performance of the battery.

[0066] Additionally, the housing 1 further has an outer surface 102.

[0067] In some embodiments, the slow-flow structure 15 includes at least one slow-flow sub-unit. Each slow-flow sub-unit includes a diversion island 17. In the direction from the head end to the tail end of the slow-flow structure 15, the diversion island 17 is adapted to divide the slow-flow channel 16 in one slow-flow sub-unit into a main channel 161 and a branch channel 162. The branch channel 162 includes a downstream channel section 1621 and an upstream channel section 1622;

[0068] The first end of the downstream channel section 1621 is connected to the first end of the main channel 161, and along the flow direction of the medium, the included angle between the first end of the downstream channel section 1621 and the first end of the main channel 161 is a, satisfying a < 90°; the first end of the upstream channel section 1622 is connected to the second end of the downstream channel section 1621, the second end of the upstream channel section 1622 is connected to the second end of the main channel 161, and along the flow direction of the medium, the included angle between the second end of the upstream channel section 1622 and the second end of the main channel 161 is b, satisfying 90° < b < 180°.

[0069] Combined Figure 5 As shown, the slow-flow structure 15 includes at least one slow-flow sub-unit. For example, the slow-flow structure 15 may include one slow-flow sub-unit, or two slow-flow sub-units, or three slow-flow sub-units, or more slow-flow sub-units.

[0070] Each flow buffer subunit includes a flow splitting island 17. Among them, the flow buffer channel 16 is formed by a local depression on the inner surface 101 of the housing 1, while the area of the flow splitting island 17 does not form a depression on the inner surface 101 of the housing 1. When the battery cell 2 abuts against the inner surface 101 of the housing 1, the flow splitting island 17 can abut against the battery cell 2, playing a supporting role for the battery cell 2, and further ensuring that the flow buffer channel 16 is not blocked.

[0071] In addition, the flow buffer structure 15 is formed on at least one side of the explosion-proof valve 13. The concave-convex form of the flow buffer structure 15 can play a role in strengthening the structure, improving the strength around the explosion-proof valve 13, reducing the deformation amount during valve opening, and thus improving the valve opening stability of the explosion-proof valve 13.

[0072] The flow buffer channel 16 is arranged around the flow splitting island 17.

[0073] The flow splitting island 17 is adapted to divide the flow buffer channel 16 in a flow buffer subunit into a main channel 161 and a branch channel 162. The branch channel 162 includes a downstream channel section 1621 and an upstream channel section 1622. In this embodiment, the main channel 161 can be a straight-line channel section, the downstream channel section 1621 is also a straight-line channel section, and the upstream channel section 1622 is an arc-shaped channel section.

[0074] The first end of the downstream channel section 1621 is connected to the first end of the main channel 161, and along the flow direction of the medium, the included angle between the first end of the downstream channel section 1621 and the first end of the main channel 161 is a, satisfying a < 90°; when the high-temperature medium flows to the downstream channel section 1621, it will generate flow splitting, with a part flowing along the main channel 161 and the other part splitting into the downstream channel section 1621.

[0075] The first end of the countercurrent channel section 1622 is in communication with the second end of the co-current channel section 1621. The high-temperature medium entering the co-current channel section 1621 follows the path of the branch channel 162 and enters the countercurrent channel section 1622. Also, since the second end of the countercurrent channel section 1622 is in communication with the second end of the main channel 161, and along the flow direction of the medium, the included angle between the second end of the countercurrent channel section 1622 and the second end of the main channel 161 is b, where 90° < b < 180°. As a result, the high-temperature medium flowing out of the countercurrent channel section 1622 will collide with the high-temperature medium in the main channel 161. Due to the mutual impact of the two airflows, the deceleration effect is achieved, that is, the flow rate of the high-temperature medium flowing through the flow-attenuating structure 15 is slowed down. The end of the flow-attenuating structure 15 is in communication with the gas storage cavity 14, thereby reducing the flow rate of the high-temperature medium entering the gas storage cavity 14, avoiding the impact of instantaneous large airflow on the explosion-proof valve 13, preventing the explosion-proof valve from being torn extremely quickly by the instantaneous large pressure, preventing an approximate explosion situation, and avoiding the overall flying out of the explosion-proof sheet of the explosion-proof valve. When the explosion-proof valve 13 reaches the opening pressure, it can be smoothly torn from the weak area, avoiding the premature opening of the explosion-proof valve and improving the opening stability of the explosion-proof valve.

[0076] In some embodiments, in combination with Figure 4 as shown, the residual thickness of the explosion-proof valve 13 in the direction perpendicular to the first shell surface 11 is T1, satisfying: 0.001×T3 ≤ T1 ≤ 1×T3, where T3 is the wall thickness of the housing 1.

[0077] By restricting the residual thickness T1 of the explosion-proof valve 13 in the direction perpendicular to the first shell surface 11 to be less than T3, the explosion-proof valve 13 is prevented from protruding from the outer surface 102 of the housing 1, preventing accidental rubbing of the explosion-proof valve 13. By restricting the residual thickness T1 of the explosion-proof valve 13 in the direction perpendicular to the first shell surface 11 to be greater than 0.001×T3, the thickness of the explosion-proof valve 13 can be ensured, guaranteeing the structural strength of the explosion-proof valve 13.

[0078] In some embodiments, in combination with Figure 4 as shown, the depth of the flow-attenuating structure 15 in the direction perpendicular to the first shell surface 11 is T2, satisfying: 0.001×T3 ≤ T2 ≤ 2×T3, where T3 is the wall thickness of the housing 1.

[0079] By restricting the depth T2 of the flow-attenuating structure 15 in the direction perpendicular to the first shell surface 11 to be greater than 0.001×T3, the flow-attenuating channel 16 can be ensured not to be blocked, facilitating the use of the flow-attenuating channel 16 as an exhaust channel. By restricting the depth T2 of the flow-attenuating structure 15 in the direction perpendicular to the first shell surface 11 to be less than 2×T3, on the basis of meeting the exhaust requirements, the flow-attenuating structure 15 can be prevented from occupying a large space, guaranteeing the energy density of the battery.

[0080] In some embodiments, the number of the flow-attenuating structures 15 is at least one.

[0081] Combined Figure 2 As shown, since the end of the flow-slowing structure 15 is connected to the gas storage cavity 14, the flow-slowing structure 15 can be one provided for connecting the gas storage cavity 14, or two or more provided for connecting the gas storage cavity 14.

[0082] In some embodiments, the number of the flow-slowing structures 15 is two; along the length direction of the battery, the two flow-slowing structures 15 are respectively arranged on both sides of the explosion-proof valve 13.

[0083] In this embodiment, along the length direction of the battery, the two flow-slowing structures 15 are respectively arranged on both sides of the explosion-proof valve 13, so as to ensure that the flow-slowing structures 15 on both sides of the explosion-proof valve 13 can simultaneously play the role of slowing down the flow rate of the medium. And arranging the two flow-slowing structures 15 on both sides of the explosion-proof valve 13 along the length direction of the battery can reasonably utilize the space in the length direction, ensure the length of the flow-slowing structure 15, and further ensure the effect of slowing down the flow rate of the medium.

[0084] In some embodiments, the two flow-slowing structures 15 are symmetrically arranged relative to the central axis of the explosion-proof valve 13 along the length direction.

[0085] By symmetrically arranging the two flow-slowing structures 15 relative to the central axis of the explosion-proof valve 13 along the length direction, the two flow-slowing structures 15 can achieve the same deceleration effect, avoid the situation of larger flow rate on one side, so as to further ensure that the airflow of the high-temperature medium entering the gas storage cavity 14 will not have the situation of too large pressure on one side, avoid uneven stress, and ensure the opening valve stability of the explosion-proof valve.

[0086] In some embodiments, the distance between the leading end of the flow-slowing structure 15 and the edge of the adjacent housing 1 along the length direction of the battery is L, satisfying: 0mm ≤ L ≤ L0, where L0 is the distance between the edge of the explosion-proof valve 13 along the length direction of the battery and the edge of the housing 1 on the same side.

[0087] The length of the flow-slowing structure 15 can be set as required. In the longest state, the flow-slowing structure 15 can be connected to the edge of the housing 1 in the length direction of the battery. As a variation, the flow-slowing structure 15 can also start from any position on the inner surface 101 of the housing 1 as the leading end.

[0088] Thus, according to different specifications and models of the battery, a suitable length is selected to ensure that the flow-slowing structure 15 can guide the airflow of the high-temperature medium and slow down the flow rate of the airflow of the high-temperature medium to a suitable speed, which is beneficial for subsequent valve opening.

[0089] The battery of this embodiment can be applied to scenarios such as electric vehicles, electric bicycles, and electric aircraft that require high safety and reliability. It can also be applied to scenarios such as home energy storage and industrial energy storage to ensure the safe operation of the battery pack in case of abnormalities.

[0090] According to an embodiment of the present invention, on the other hand, an electrical device is further provided, including: the battery as described above.

[0091] In this embodiment, it is preferably to orient the valve opening direction of the battery downward, so as to prevent fireworks from invading the passenger compartment and improve safety.

[0092] The electrical device of this embodiment can be an electric vehicle, an electric bicycle, an electric aircraft, etc. It can also be a household energy storage device, an industrial energy storage device, etc., to ensure the safe operation of the electrical device.

[0093] Obviously, the above embodiments are only examples for clear illustration and are not limitations on the implementation manners. Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A battery, characterized in that: include: A housing (1) having a mounting cavity (12) formed therein; A battery cell (2) is arranged in the installation cavity (12); An explosion-proof valve (13) is arranged on the first shell surface (11) of the shell (1), and a region between the explosion-proof valve (13) and the battery core (2) forms a gas storage chamber (14); A slow flow structure (15) is formed on the first shell surface (11) of the shell (1), and the slow flow structure (15) has a slow flow channel (16) suitable for guiding the flow of the medium; from the head end of the slow flow structure (15) to the end end, the slow flow structure (15) is suitable for slowing down the flow rate of the medium; the end end of the slow flow structure (15) is connected to the air storage chamber (14).

2. The battery according to claim 1, characterized in that The shell (1) has an inner surface (101) facing the installation cavity (12), and the slow-flow channel (16) is formed by a partial depression of the inner surface (101) of the shell (1).

3. The battery according to claim 2, characterized in that The slow flow structure (15) comprises at least one slow flow subunit, each of the slow flow subunits comprises a diversion island (17), and in a direction from the head end to the tail end of the slow flow structure (15), the diversion island (17) is suitable for dividing the slow flow channel (16) in one of the slow flow subunits into a main channel (161) and a branch channel (162), and the branch channel (162) comprises a downstream channel section (1621) and a reverse flow channel section (1622); The first end of the downstream channel section (1621) is connected to the first end of the main channel (161), and along the flow direction of the medium, the angle between the first end of the downstream channel section (1621) and the first end of the main channel (161) is a, satisfying a<90°; the first end of the upstream channel section (1622) is connected to the second end of the downstream channel section (1621), the second end of the upstream channel section (1622) is connected to the second end of the main channel (161), and along the flow direction of the medium, the angle between the second end of the upstream channel section (1622) and the second end of the main channel (161) is b, satisfying 90°<b<180°.

4. The battery according to claim 1, characterized in that The residual thickness of the explosion-proof valve (13) in a direction perpendicular to the first shell surface (11) is T1, satisfying the following relationship: 0.001×T3≤T1≤1×T3, wherein T3 is the wall thickness of the shell (1).

5. The battery according to claim 1, characterized in that The depth of the slow flow structure (15) in a direction perpendicular to the first shell surface (11) is T2, satisfying: 0.001×T3≤T2≤2×T3, wherein T3 is the wall thickness of the shell (1).

6. The battery according to claim 1, characterized in that The number of the flow-slowing structure (15) is at least one.

7. The battery according to claim 6, characterized in that The number of the slow-flow structures (15) is two; along the length direction of the battery, the two slow-flow structures (15) are respectively arranged on both sides of the explosion-proof valve (13).

8. The battery according to claim 7, characterized in that The two flow-slowing structures (15) are symmetrically arranged relative to the explosion-proof valve (13) along the central axis in the length direction.

9. The battery according to any one of claims 1 to 8, characterized in that: The distance between the head end of the slow-flow structure (15) and the edge of the adjacent shell (1) along the length direction of the battery is L, satisfying: 0mm≤L≤L0, wherein L0 is the distance between the edge of the explosion-proof valve (13) along the length direction of the battery and the edge of the shell (1) on the same side.

10. An electrical device, characterized in that: A battery comprising a battery as claimed in any one of claims 1 to 9.

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