energy storage device

Abstract

The application provides a kind of energy storage device. The energy storage device includes a housing, a battery device, a pressure relief passage, and a pressure relief member. The housing includes a top frame, a front wall and a rear wall arranged opposite in a first direction, a top wall and a bottom wall arranged opposite in a second direction, the top wall is fixed to the top frame, the top frame includes a front edge beam facing the front wall, and the first direction is perpendicular to the second direction. The battery device is arranged in the housing, and the battery device includes a plurality of battery modules. The pressure relief passage is located between the front wall and the battery device. The pressure relief member is arranged on the top wall, and the pressure relief member is fixed to the front edge beam. In the second direction, at least part of the pressure relief member is arranged opposite the pressure relief passage, and the pressure relief member is configured to open the pressure relief in response to the internal pressure of the housing reaching a threshold value.

Description

Technical Field

[0001] This application relates to the field of energy storage, and in particular to an energy storage device. Background Technology

[0002] Energy storage technology is a type of energy storage technology. It converts electrical energy into other forms of energy for storage, and then converts that other form of energy back into electrical energy when needed. Energy storage devices are used to store electrical energy. Ensuring the safety of energy storage devices is one of the key research directions in the development of energy storage technology. Summary of the Invention

[0003] In view of the above problems, this application provides an energy storage device that can improve the safety of energy storage devices.

[0004] This application provides an energy storage device, including a housing, a battery assembly, a pressure relief channel, and a pressure relief component. The housing includes a top frame, a front wall and a rear wall disposed opposite each other along a first direction, and a top wall and a bottom wall disposed opposite each other along a second direction. The top wall is fixed to the top frame, and the top frame includes a front beam facing the front wall. The first direction is perpendicular to the second direction. The battery assembly is disposed within the housing and includes multiple battery modules. The pressure relief channel is located between the front wall and the battery assembly. The pressure relief component is disposed on the top wall and fixed to the front beam. Along the second direction, at least a portion of the pressure relief component is disposed opposite to the pressure relief channel. The pressure relief component is configured to open for pressure relief in response to the internal pressure of the housing reaching a threshold.

[0005] In the energy storage device of this application embodiment, a battery unit is installed inside the casing. A pressure relief component is installed on the top of the casing. Under normal operating conditions, the pressure relief channel can serve as a heat dissipation space for the battery module. When thermal runaway occurs in the battery module, the high-temperature, high-pressure gas released by the battery module can flow to the pressure relief channel, making the pressure relief channel a space for explosion venting. When the pressure in the pressure relief channel rises to the pressure resistance threshold of the pressure relief component, the pressure relief component opens to discharge the gas in the pressure relief channel out of the casing, releasing the internal pressure of the casing, reducing the possibility of the internal pressure of the casing continuing to rise and causing an explosion, and improving the safety of the energy storage device. The way the pressure relief component is fixed to the front beam allows the front beam to be reused, which helps to reduce the number of parts used to fix the pressure relief component and reduces the assembly difficulty of the pressure relief component and the casing. The pressure relief component is located close to the front beam, so that the pressure relief component can have a large contact area with the gas in the pressure relief channel, and the flow path of the gas in the pressure relief channel to the pressure relief component is relatively short, which helps the pressure relief component to quickly respond to pressure changes and open for pressure relief.

[0006] In one or more of the above alternative embodiments, a pressure relief channel is formed between the front wall and the battery device.

[0007] In one or more of the above optional embodiments, the pressure relief component includes a weak portion, which is configured to break in response to the internal pressure of the housing reaching a threshold, so that the pressure relief component opens to release pressure, and at least a portion of the weak portion is disposed opposite to the pressure relief channel in a second direction.

[0008] When the pressure in the pressure relief channel rises to the pressure resistance threshold of the pressure relief component, the weak part can quickly respond to the pressure change and break, which helps to shorten the response time of the pressure relief component, improve the pressure sensitivity and response rate of the pressure relief component, and reduce the possibility of the pressure relief component delaying opening and affecting the safety of the energy storage device.

[0009] In one or more of the above optional embodiments, the distance between the weak part and the front beam is less than 5 mm along the first direction.

[0010] The weak point is located relatively close to the front beam, which makes the area of ​​the pressure relief component facing the pressure relief channel larger. This helps to improve the pressure change response rate of the pressure relief component and reduce the possibility of the pressure relief component delaying opening and affecting the safety of the energy storage equipment.

[0011] In one or more of the above optional embodiments, the weak part is annular and is arranged around the edge of the pressure relief component.

[0012] Setting a weak point near the edge of the pressure relief component helps to increase the area of ​​the pressure-bearing part, improve the pressure change response rate of the pressure relief component, and reduce the possibility of the pressure relief component delaying opening and affecting the safety of the energy storage device.

[0013] In one or more of the above optional embodiments, the thickness of the weak part is less than the thickness of other parts of the pressure relief component, resulting in relatively low strength in the weak part area. When the pressure in the pressure relief channel rises to the pressure resistance threshold of the pressure relief component, the weak part can quickly respond to the pressure change and break, which helps to shorten the response time of the pressure relief component, improve the pressure sensitivity and response rate of the pressure relief component, and reduce the possibility of delayed opening of the pressure relief component affecting the safety of the energy storage device.

[0014] In one or more of the above optional embodiments, the pressure relief component includes a recess facing away from the interior of the housing and not communicating with the interior of the housing. The recess includes a base and a fixing portion, a part of the fixing portion is fixed to the front beam, and the weak point is located at the base.

[0015] The recessed design of the pressure relief component helps to reduce the space occupied by the pressure relief component in the second direction, thereby reducing the space occupied by the energy storage device in the second direction and facilitating the miniaturization design of the energy storage device in the second direction.

[0016] In one or more of the above optional embodiments, the housing includes a support beam, which is fixed to the top frame. Both the front beam and the support beam are fixed to the pressure relief component. The top frame includes a left beam and a right beam arranged opposite each other along a third direction. The front beam, the left beam, and the right beam are all fixed to the support beam. The first direction, the second direction, and the third direction are perpendicular to each other.

[0017] Both the front beam and the support beam can support the pressure relief component. Each of the front beam and support beam forms a connection point with the pressure relief component, which increases the number of connection points and improves the connection stability and reliability of the pressure relief component. During the pressure relief process, the impact stress on the pressure relief component can be transferred to the entire shell through the front beam, support beam, left beam, and right beam, which helps to disperse the impact stress and reduce the possibility of the impact stress forcing the top of the shell open.

[0018] In one or more of the above optional embodiments, the support beam includes a first sub-support beam and a second sub-support beam. The first sub-support beam fixes the second sub-support beam and the front beam, and the second sub-support beam fixes the left beam and the right beam. The fixing part includes a first sub-fixing part fixed to the first sub-support beam and a second sub-fixing part fixed to the second sub-support beam.

[0019] The first and second sub-support beams form connection points with the first and second sub-fixed parts, respectively, which helps to increase the number of connection points and improve the connection stability and reliability of the pressure relief components.

[0020] In one or more of the above alternative embodiments, along the second direction, the projection of the first sub-support beam is separate from the projection of the base.

[0021] The first sub-support beam avoids the weak part of the pressure relief component, reducing the possibility that the weak part may not break in time during the pressure relief process due to the first sub-support beam blocking the weak part.

[0022] In one or more of the above alternative embodiments, along the second direction, the projection of the second sub-support beam is separate from the projection of the base.

[0023] The second sub-support beam avoids the weak part of the pressure relief component, reducing the possibility that the weak part may not break in time during the pressure relief process due to the second sub-support beam blocking the weak part.

[0024] In one or more of the above optional embodiments, the support beam includes a third sub-support beam, which is fixedly connected to the second sub-support beam and the front beam, and the fixing part includes a third sub-fixing part fixed to the third sub-support beam.

[0025] The first, second, and third sub-support beams form connection points with the first, second, and third sub-fixed parts, respectively. This increases the number of connection points and improves the connection stability and reliability of the pressure relief component. Along the second direction, the projection of the third sub-support beam is separate from the projection of the base, allowing the third sub-support beam to avoid the weak point and reducing the possibility that the weak point might fail to fracture in time during pressure relief due to the third sub-support beam obstructing it.

[0026] In one or more of the above optional embodiments, the housing includes a reinforcing beam that fixes the front beam and the support beam together, and the base is disposed opposite to the reinforcing beam. The reinforcing beam is located on the side of the pressure relief component facing the interior of the housing and is configured to support the base.

[0027] The base of the pressure relief component has a weak point. The structural strength of the pressure relief component is relatively low at the weak point. The reinforcing beam supports the base, reducing the possibility of sagging or sinking due to insufficient structural strength.

[0028] In one or more of the above optional embodiments, the reinforcing beam includes a first sub-reinforcing beam extending along a first direction and a second sub-reinforcing beam extending along a third direction. One end of the first sub-reinforcing beam is fixed to the front beam, and the other end is fixed to the second sub-support beam. Both ends of the second sub-reinforcing beam are fixed to the first sub-support beam and the third sub-support beam, respectively.

[0029] In one or more of the above alternative embodiments, a gap exists between the reinforcing beam and the battery device along the second direction. The reinforcing beam and the battery device do not contact each other, thus lowering the reinforcing beam to transfer force to the battery device.

[0030] In one or more of the above optional embodiments, the energy storage device includes an elastic element connected to the base, the elastic element having a groove, and a reinforcing beam disposed in the groove.

[0031] The elastic element can separate the reinforcing beam and the base, so that the reinforcing beam and the base do not come into direct contact. This reduces the possibility that the base may be deformed or dented due to the reinforcing beam squeezing or colliding with it during assembly. It also reduces the possibility that the base may be subjected to uneven force during the depressurization process due to deformation or dent, which may affect the depressurization effect.

[0032] In one or more of the above optional embodiments, the elastic element includes, but is not limited to, foam.

[0033] In one or more of the above optional embodiments, the thermal conductivity of the elastic element is less than 0.03 W / (m·K).

[0034] In one or more of the above optional embodiments, the battery module includes a pressure relief section. The pressure relief section is disposed facing the pressure relief channel. The pressure relief section is exposed in the pressure relief channel.

[0035] The pressure relief section and the pressure relief channel are arranged opposite each other so that when the pressure relief section is opened, the gas in the battery module can directly enter the pressure relief channel, shortening the gas flow path. The gas in the battery module experiences less flow resistance and can be smoothly released from the pressure relief section, improving the safety of the battery module.

[0036] In one or more of the above optional embodiments, the pressure relief element includes a drainage channel. The drainage channel communicates with the recess.

[0037] In the event of water (such as rainwater) entering the recess, the water can be drained through the drainage channel, reducing the accumulation and retention of water in the recess and lowering the possibility of corrosion of the pressure relief components due to long-term water retention.

[0038] In one or more of the above optional embodiments, the battery module includes a pressure relief section, which is disposed facing the pressure relief channel, and along the second direction, the orthographic projection of the pressure relief section is located within the orthographic projection of the pressure relief component. Attached Figure Description

[0039] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0040] Figure 1 This is a schematic diagram of the structure of an energy storage device provided in an embodiment of this application;

[0041] Figure 2 This is a schematic diagram of the structure of an energy storage device provided in an embodiment of this application;

[0042] Figure 3 This is a partial cross-sectional view of an energy storage device provided in an embodiment of this application;

[0043] Figure 4 This is a partial structural schematic diagram of an energy storage device provided in an embodiment of this application;

[0044] Figure 5 This is a partially exploded structural diagram of an energy storage device provided in an embodiment of this application;

[0045] Figure 6 yes Figure 3 Enlarged view of point M in the middle;

[0046] Figure 7 yes Figure 6 Enlarged view of point P in the middle;

[0047] Figure 8 yes Figure 4Enlarged view of point V in the middle;

[0048] Figure 9 This is a schematic diagram of the structure of a pressure relief component provided in one embodiment of this application;

[0049] Figure 10 This is a schematic diagram of the structure of a pressure relief component provided in one embodiment of this application;

[0050] Figure 11 This is a schematic diagram of the structure of the pressure relief component and the elastic component provided in an embodiment of this application.

[0051] Explanation of reference numerals in the attached figures:

[0052] 10. Energy storage equipment; 101. Pressure relief channel;

[0053] 20. Shell;

[0054] 201. Support beam; 2011. First sub-support beam; 2012. Second sub-support beam; 2013. Third sub-support beam;

[0055] 202, Reinforcing Beam; 2021, First Sub-Reinforcing Beam; 2022, Second Sub-Reinforcing Beam;

[0056] 21. Front wall; 22. Rear wall; 23. Top wall; 24. Bottom wall; 25. Top frame; 251. Front beam; 252. Left beam; 253. Right beam; 26. Bottom frame;

[0057] 30. Battery assembly; 31. Battery module; 311. Pressure relief section;

[0058] 40. Pressure relief component; 401. Weak part; 41. Recess; 411. Base; 412. Fixing part; 4121. First sub-fixing part; 4122. Second sub-fixing part; 4123. Third sub-fixing part; 4124. Fourth sub-fixing part; 42. Drainage channel;

[0059] 50. Elastic element; 51. Groove;

[0060] X, first direction;

[0061] Y, second direction;

[0062] Z, Third-party orientation. Detailed Implementation

[0063] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0064] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0065] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0066] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0067] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0068] See Figures 1 to 5 As shown, this application embodiment provides an energy storage device 10, which includes a housing 20 and a battery device 30, with the battery device 30 disposed within the housing 20. The battery device 30 includes a plurality of battery modules 31.

[0069] In some possible implementations, the housing 20 includes a top frame 25, a front wall 21 and a rear wall 22 disposed opposite each other along a first direction X, and a top wall 23 and a bottom wall 24 disposed opposite each other along a second direction Y. The top wall 23 is fixed to the top frame 25. The top frame 25 includes a front beam 251 facing the front wall 21. The first direction X is perpendicular to the second direction Y.

[0070] In some possible implementations, housing 20 includes a bottom frame 26. Top frame 25 and bottom frame 26 are disposed opposite each other along a second direction Y, and bottom wall 24 is fixed to bottom frame 26.

[0071] In some feasible implementations, the energy storage device 10 includes a pressure relief channel 101 located between the front wall 21 and the battery assembly 30. The pressure relief channel 101 is an air gap that is not obstructed or filled by any other device. At least a portion of the pressure relief element 40 is disposed opposite to the pressure relief channel 101 to increase the effective venting area of ​​the pressure relief element 40. When the pressure relief element 40 is open, the gas in the pressure relief channel 101 experiences less flow resistance and can be smoothly vented from the pressure relief element 40.

[0072] In some feasible ways, a pressure relief channel 101 is formed between the front wall 21 and the battery device 30.

[0073] See also some of the possible implementation methods. Figure 2 and Figure 3 As shown, the battery module 31 includes a pressure relief section 311. The pressure relief section 311 is disposed facing the pressure relief channel 101. The pressure relief section 311 is exposed in the pressure relief channel 101. The pressure relief section 311 is disposed opposite to the pressure relief channel 101 so that when the pressure relief section 311 is opened, the gas in the battery module 31 can directly enter the pressure relief channel 101, shortening the gas flow path. The gas in the battery module 31 experiences less flow resistance and can be smoothly released from the pressure relief section 311, improving the safety of the battery module 31.

[0074] When thermal runaway occurs in the battery module 31, the high-temperature, high-pressure gas inside can relatively easily damage the pressure relief section 311 to release the internal pressure of the battery module 31. The pressure relief section 311 faces the pressure relief channel 101. After the pressure relief section 311 is damaged, the high-temperature, high-pressure gas inside the battery module 31 can directly enter the pressure relief channel 101. The flow path of the high-temperature, high-pressure gas to the pressure relief channel 101 is relatively short, which helps to improve the response rate of the pressure relief component 40, so that the pressure relief component 40 can open and relieve pressure in a relatively short time.

[0075] In some examples, the pressure relief section 311 includes, but is not limited to, a pressure relief valve.

[0076] In some feasible implementations, the energy storage device 10 includes a pressure relief element 40. The pressure relief element 40 is disposed on the top wall 23. The pressure relief element 40 is fixed to the front beam 251. At least a portion of the pressure relief element 40 is disposed opposite to the pressure relief channel 101 along the second direction Y. The pressure relief element 40 is configured to open for pressure relief when the internal pressure of the housing 20 reaches a threshold. The arrangement of at least a portion of the pressure relief element 40 opposite to the pressure relief channel 101 allows for a larger contact area between the pressure relief element 40 and the gas within the pressure relief channel 101, resulting in a relatively short flow path for the gas within the pressure relief channel 101 to reach the pressure relief element 40. This facilitates the rapid response of the pressure relief element 40 to pressure changes and the opening of the pressure relief mechanism.

[0077] In this embodiment of the energy storage device 10, the housing 20 provides a mounting base for the battery module 31. The housing 20 protects the battery module 31, reducing the possibility of structural damage due to collision. The battery module 31 stores electrical energy. When the energy storage device 10 needs to discharge, the battery module 31 can output electrical energy. The battery module 31 is a device that can convert electrical energy into chemical energy and vice versa.

[0078] Under normal operating conditions, the pressure relief channel 101 serves as a heat dissipation space for the battery module 31, facilitating the dissipation of heat generated by the battery module 31. When thermal runaway occurs in the battery module 31 within the casing 20, the battery module 31 releases internal pressure by venting high-temperature, high-pressure gas, reducing the likelihood of a sustained increase in internal pressure and potential explosion, thus enhancing the safety of the battery module 31. The high-temperature, high-pressure gas released from the battery module 31 can flow into the pressure relief channel 101.

[0079] The pressure relief component 40 is configured to open when the pressure in the pressure relief channel 101 rises to the pressure resistance threshold of the pressure relief component 40, so as to release the pressure in the pressure relief channel 101, discharge the gas in the pressure relief channel 101 out of the housing 20, reduce the possibility of the internal pressure of the housing 20 continuing to rise and causing an explosion, and improve the safety of the energy storage device 10.

[0080] In the energy storage device 10 of this application embodiment, a battery device 30 is disposed inside the housing 20. A pressure relief component 40 is disposed on the top of the housing 20. Under normal operating conditions, the pressure relief channel 101 can serve as a heat dissipation space for the battery module 31. When the battery module 31 in the battery device 30 experiences thermal runaway, the high-temperature and high-pressure gas released by the battery module 31 can flow to the pressure relief channel 101, making the pressure relief channel 101 a space for explosion venting. When the pressure in the pressure relief channel 101 rises to the pressure resistance threshold of the pressure relief component 40, the pressure relief component 40 opens to discharge the gas in the pressure relief channel 101 out of the housing 20, releasing the internal pressure of the housing 20, reducing the possibility of the internal pressure of the housing 20 continuing to rise and causing an explosion, and improving the safety of the energy storage device 10. The way the pressure relief component 40 is fixed to the front beam 251 allows the front beam 251 to be reused, which helps to reduce the number of parts used to fix the pressure relief component 40 and reduces the assembly difficulty of the pressure relief component 40 and the housing 20. The pressure relief component 40 is positioned close to the front beam 251, which allows the pressure relief component 40 to have a large contact area with the gas in the pressure relief channel 101. The flow path of the gas in the pressure relief channel 101 to the pressure relief component 40 is relatively short, which is conducive to the pressure relief component 40 quickly responding to pressure changes and opening to relieve pressure.

[0081] In some feasible embodiments, the pressure relief component 40 and the housing 20 can each be separately manufactured components. The pressure relief component 40 can be fixed to the front beam 251 by mechanical connection.

[0082] In some feasible ways, fixing the pressure relief component 40 to the front beam 251 includes a detachable connection between the pressure relief component 40 and the front beam 251, for example, by using fasteners such as screws to fix the pressure relief component 40 to the front beam 251.

[0083] In some feasible ways, fixing the pressure relief component 40 to the front beam 251 includes welding the pressure relief component 40 to the front beam 251 or using rivets for connection.

[0084] See also some of the possible implementation methods. Figure 3 , Figure 6 and Figure 7 As shown, the pressure relief component 40 includes a weak portion 401. The weak portion 401 is configured to break when the internal pressure of the housing 20 reaches a threshold, thereby opening the pressure relief component 40 to release pressure. Along the second direction Y, at least a portion of the weak portion 401 is disposed opposite to the pressure relief channel 101. The gas flow path from the pressure relief channel 101 to the weak portion 401 is relatively short, which facilitates the rapid breakage of the weak portion 401 in response to pressure changes.

[0085] In some feasible implementations, the thickness of the weak portion 401 is less than the thickness of other parts of the pressure relief component 40, resulting in relatively low strength in the area of ​​the weak portion 401. When the pressure in the pressure relief channel 101 rises to the pressure resistance threshold of the pressure relief component 40, the weak portion 401 can quickly respond to the pressure change and fracture, which helps to shorten the response time of the pressure relief component 40, improve the pressure sensitivity and response rate of the pressure relief component 40, and reduce the possibility that the delayed opening of the pressure relief component 40 may affect the safety of the energy storage device 10.

[0086] In some examples, along the second direction Y, a portion of the pressure relief member 40 and a portion of the weak portion 401 are disposed opposite to the pressure relief channel 101, while another portion of the pressure relief member 40 and another portion of the weak portion 401 are disposed opposite to the battery device 30. An airflow channel is formed between the pressure relief member 40 and the battery device 30. The pressure relief channel 101 and the airflow channel are connected. A portion of the gas in the pressure relief channel 101 can enter the airflow channel and apply pressure to the pressure relief member 40, which helps to increase the overall force on the pressure relief member 40 and improve the response speed of the pressure relief member 40 in opening and releasing pressure.

[0087] See in some examples Figure 7As shown, along the first direction X, the distance D between the weak part 401 and the front beam 251 is less than 5 millimeters (mm). The weak part 401 is positioned relatively close to the front beam 251, which makes the area of ​​the pressure relief component 40 facing the pressure relief channel 101 larger. This is beneficial to improving the pressure change response rate of the pressure relief component 40 and reducing the possibility that the delayed opening of the pressure relief component 40 may affect the safety of the energy storage device 10.

[0088] For example, the distance D between the weak part 401 and the front beam 251 can be 4 mm, 3 mm, 2 mm, or 1 mm.

[0089] In some examples, the weak point 401 is annular. The weak point 401 is arranged around the edge of the pressure relief member 40. The area defined inside the weak point 401 on the pressure relief member 40 is the pressure-bearing part. The gas in the pressure relief channel 101 mainly acts on this pressure-bearing part. After the weak point 401 breaks, the pressure-bearing part will fold outward or the entire pressure-bearing part will separate from the pressure relief member 40 to achieve the pressure relief function of the pressure relief member 40. The way of setting the weak point 401 near the edge of the pressure relief member 40 is beneficial to increase the area of ​​the pressure-bearing part, improve the pressure change response rate of the pressure relief member 40, and reduce the possibility that the delayed opening of the pressure relief member 40 may affect the safety of the energy storage device 10.

[0090] The term "weak part 401 is annular" means that the weak part 401 is a closed structure. For example, the pressure relief component 40 can be a rectangular structure, and the weak part 401 can be a rectangular annular structure. Alternatively, the pressure relief component 40 can be a circular structure, and the weak part 401 can be an annular structure.

[0091] For example, a portion of the weak portion 401 is disposed opposite to the pressure relief channel 101 along the second direction Y, and another portion is disposed opposite to the battery device 30 along the second direction Y.

[0092] See in some examples Figure 6 and Figure 7 As shown, the pressure relief component 40 includes a recess 41. The recess 41 faces away from the interior of the housing 20 and towards the external space of the housing 20. The recess 41 is not in communication with the interior of the housing 20. The recess 41 includes a base 411 and a fixing portion 412. A portion of the fixing portion 412 is fixed to the front beam 251. A weak portion 401 is provided at the base 411.

[0093] The recess 41 provided in the pressure relief component 40 helps to reduce the space occupied by the pressure relief component 40 in the second direction Y, thereby reducing the space occupied by the energy storage device 10 in the second direction Y and facilitating the miniaturization design of the energy storage device 10 in the second direction Y.

[0094] Along the direction opposite to the second direction Y, the fixing part 412 protrudes from the base 411. Along the second direction Y, the thickness of the fixing part 412 is greater than the thickness of the base 411. When the pressure in the pressure relief channel 101 rises to the pressure resistance threshold of the pressure relief member 40, the weak part 401 breaks, causing a portion of the base 411 to fold outwards or separate from the pressure relief member 40 to relieve pressure. When the pressure relief member 40 is open for pressure relief, the fixing part 412 can be connected to the front beam 251.

[0095] In some examples, a portion of the fixing part 412 and the front beam 251 can be detachably connected and fixed by fasteners such as screws.

[0096] In some examples, a portion of the fixing part 412 and the front beam 251 can be welded or riveted.

[0097] See in some examples Figure 9 As shown, the fixing part 412 includes a fourth sub-fixing part 4124. The fourth sub-fixing part 4124 is fixed to the front beam 251.

[0098] For example, when the pressure in the pressure relief channel 101 rises to the pressure resistance threshold of the pressure relief component 40, the area on the annular weak portion 401 opposite to the pressure relief channel 101 breaks. Part of the area on the weak portion 401 opposite to the battery device 30 breaks, while a part does not. The base 411 folds outward to release pressure.

[0099] For example, when the pressure in the pressure relief channel 101 rises to the pressure resistance threshold of the pressure relief component 40, the annular weak portion 401 breaks completely. The base 411 separates from the pressure relief component 40 to relieve pressure, which facilitates the rapid discharge of gas from the pressure relief component 40 into the housing 20 and improves the pressure relief efficiency of the pressure relief component 40.

[0100] For example, a groove is machined on the pressure relief member 40 to correspondingly form the weak point 401. The opening of the groove faces the inside of the housing 20.

[0101] In some examples, the weak portion 401 is arranged around the edge of the base 411.

[0102] See in some examples Figure 4 and Figure 8 As shown, the housing 20 includes a support beam 201. The support beam 201 is fixed to the top frame 25. Along the first direction X, the front beam 251 and the support beam 201 are arranged adjacent to each other. Both the front beam 251 and the support beam 201 are fixed to the pressure relief component 40. The top frame 25 includes a left beam 252 and a right beam 253 arranged opposite each other along the third direction Z. The front beam 251, the left beam 252, and the right beam 253 are all fixed to the support beam 201. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0103] Both the front beam 251 and the support beam 201 can support the pressure relief component 40. Each of the front beam 251 and the support beam 201 forms a connection point with the pressure relief component 40, which increases the number of connection points and improves the connection stability and reliability of the pressure relief component 40. During the pressure relief process, the impact stress on the pressure relief component 40 can be transferred to the entire housing 20 through the front beam 251, support beam 201, left beam 252, and right beam 253, which helps to disperse the impact stress and reduces the possibility of the impact stress causing the top of the housing 20 to be forced open.

[0104] For example, the left beam 252 and the right beam 253 are each fixed to the front beam 251. For instance, the left beam 252 and the right beam 253 are each fixed to the front beam 251 by fasteners such as screws. Alternatively, the left beam 252 and the right beam 253 are each welded to the front beam 251.

[0105] For example, the left beam 252 and the right beam 253 are each fixed to the support beam 201 by fasteners such as screws. Alternatively, the left beam 252 and the right beam 253 are each welded to the support beam 201.

[0106] For example, the support beam 201 is fixed to the fixing part 412 of the pressure relief component 40 by fasteners such as screws, or the support beam 201 is welded to the fixing part 412 of the pressure relief component 40.

[0107] See in some examples Figure 4 , Figure 8 and Figure 9 As shown, the support beam 201 includes a first sub-support beam 2011 and a second sub-support beam 2012. Along the first direction X, the front beam 251 and the second sub-support beam 2012 are spaced apart. The second sub-support beam 2012 is fixedly connected to the left beam 252 and the right beam 253, and the second sub-support beam 2012 fixes the left beam 252 and the right beam 253. The first sub-support beam 2011 connects the second sub-support beam 2012 and the front beam 251, and the first sub-support beam 2011 is fixed to the second sub-support beam 2012 and the front beam 251. The fixing part 412 includes a first sub-fixing part 4121 fixed to the first sub-support beam 2011 and a second sub-fixing part 4122 fixed to the second sub-support beam 2012.

[0108] The first sub-support beam 2011 and the second sub-support beam 2012 form connection points with the first sub-fixed part 4121 and the second sub-fixed part 4122, respectively, which helps to increase the number of connection points and improve the connection stability and reliability of the pressure relief component 40.

[0109] Along the second direction Y, the projection of the first sub-support beam 2011 is separate from the projection of the base 411. Similarly, along the second direction Y, the projection of the second sub-support beam 2012 is separate from the projection of the base 411. Separate projections mean that the projections do not overlap. The first sub-support beam 2011 and the second sub-support beam 2012 avoid the weak point 401 of the pressure relief component 40, reducing the possibility that the weak point 401 might fail to fracture in time due to the first sub-support beam 2011 and the second sub-support beam 2012 obstructing it during pressure relief.

[0110] For example, the first sub-support beam 2011 and the second sub-support beam 2012 are fixed together by fasteners such as screws. Alternatively, the first sub-support beam 2011 and the second sub-support beam 2012 are welded together.

[0111] For example, the first sub-support beam 2011 and the front beam 251 are fixed together by fasteners such as screws. Alternatively, the first sub-support beam 2011 and the front beam 251 are welded together.

[0112] For example, the first sub-support beam 2011 extends along a first direction X. The second sub-support beam 2012 extends along a third direction Z.

[0113] For example, a portion of the left beam 252, the front beam 251, a portion of the right beam 253, and the second sub-support beam 2012 enclose a rectangular structure. The pressure relief component 40 is also a rectangular structure.

[0114] See in some examples Figure 4 and Figure 8 As shown, the support beam 201 includes a third sub-support beam 2013. The third sub-support beam 2013 connects the second sub-support beam 2012 and the front beam 251, and is fixed to the second sub-support beam 2012 and the front beam 251. The fixing part 412 includes a third sub-fixing part 4123 fixed to the third sub-support beam 2013.

[0115] The first sub-support beam 2011, the second sub-support beam 2012, and the third sub-support beam 2013 form connection points with the first sub-fixed part 4121, the second sub-fixed part 4122, and the third sub-fixed part 4123, respectively. This increases the number of connection points and improves the connection stability and reliability of the pressure relief component 40. Along the second direction Y, the projection of the third sub-support beam 2013 is separate from the projection of the base 411, allowing the third sub-support beam 2013 to avoid the weak part 401. This reduces the possibility that the weak part 401 might fail to break in time during pressure relief due to the third sub-support beam 2013 obstructing it.

[0116] For example, the third sub-support beam 2013 and the second sub-support beam 2012 are fixed together by fasteners such as screws. Alternatively, the third sub-support beam 2013 and the second sub-support beam 2012 are welded together.

[0117] For example, the third sub-support beam 2013 and the front beam 251 are fixed together by fasteners such as screws. Alternatively, the first sub-support beam 2011 and the front beam 251 are welded together.

[0118] For example, the third sub-support beam 2013 extends along the first direction X.

[0119] For example, the first sub-support beam 2011, the second sub-support beam 2012, the third sub-support beam 2013, and the front beam 251 enclose a rectangular frame. The fixing part 412 of the pressure relief component 40 is rectangular.

[0120] See also some of the possible implementation methods. Figure 5 , Figure 6 and Figure 8 As shown, the housing 20 includes a reinforcing beam 202. The reinforcing beam 202 fixes the front beam 251 and the support beam 201 together, and is fixed to both. A base 411 is disposed opposite to the reinforcing beam 202. The reinforcing beam 202 is located on the side of the pressure relief member 40 facing the interior of the housing 20. The reinforcing beam 202 is configured to support the base 411.

[0121] The base 411 of the pressure relief component 40 has a weak point 401. The structural strength of the pressure relief component 40 at the weak point 401 is relatively low. The reinforcing beam 202 supports the base 411, reducing the possibility of the base 411 sagging or denting due to insufficient structural strength.

[0122] During the pressure relief process of opening the pressure relief component 40, the pressure relief airflow can pass through the hollow space formed between the front beam 251, the reinforcing beam 202, and the support beam 201. During the pressure relief process of opening the pressure relief component 40, the impact stress on the pressure relief component 40 can be transferred to the entire shell 20 through the front beam 251, the reinforcing beam 202, the support beam 201, the left beam 252, and the right beam 253, which helps to disperse the impact stress and reduce the possibility of the impact stress blowing open the top of the shell 20.

[0123] In some examples, the reinforcing beam 202 and the support beam 201 are secured together with fasteners such as screws. Alternatively, the reinforcing beam 202 and the support beam 201 are welded together. The reinforcing beam 202 and the front beam 251 are secured together with fasteners such as screws. Alternatively, the reinforcing beam 202 and the front beam 251 are welded together.

[0124] In some examples, the reinforcing beam 202 includes a first sub-reinforcing beam 2021 extending along a first direction X and a second sub-reinforcing beam 2022 extending along a third direction Z. One end of the first sub-reinforcing beam 2021 is fixed to the front beam 251, and the other end is fixed to the second sub-support beam 2012. The two ends of the second sub-reinforcing beam 2022 are fixed to the first sub-support beam 2011 and the third sub-support beam 2013, respectively.

[0125] In some examples, there is a gap between the reinforcing beam 202 and the battery device 30 along the second direction Y. The reinforcing beam 202 does not contact the battery device 30, and lowering the reinforcing beam 202 transmits force to the battery device 30.

[0126] See in some examples Figure 6 , Figure 10 and Figure 11 As shown, the energy storage device 10 includes an elastic member 50 connected to the base 411. The elastic member 50 is provided with a groove 51. A reinforcing beam 202 is provided in the groove 51. At least a portion of the reinforcing beam 202 is located within the groove 51.

[0127] The elastic element 50 can separate the reinforcing beam 202 and the base 411, so that the reinforcing beam 202 and the base 411 do not come into direct contact. This reduces the possibility that the reinforcing beam 202 may squeeze or collide with the base 411 during the assembly process, causing the base 411 to deform or dent. It also reduces the possibility that the base 411 will be subjected to uneven force during the depressurization process due to deformation or dent, which may affect the depressurization effect.

[0128] In some examples, a cooling device with cooling function is provided inside the housing 20 to maintain the temperature inside the housing 20 at a suitable operating temperature. The base 411 itself has a relatively small thickness; when the ambient temperature outside the housing 20 is high, external heat can be conducted through the base 411 into the housing 20, adversely affecting the cooling efficiency of the cooling device. The elastic member 50 can have a heat insulation function. The way the elastic member 50 is provided on the base 411 allows the elastic member 50 to isolate heat from the outside of the housing 20 from being conducted into the housing 20, reducing the possibility that external heat will adversely affect the cooling efficiency of the cooling device inside the housing 20.

[0129] For example, the elastic element 50 may be, but is not limited to, foam.

[0130] For example, the thermal conductivity of the elastic element 50 is less than 0.03 W / (m·K).

[0131] For example, the elastic element 50 and the base 411 are bonded together.

[0132] For example, the elastic member 50 includes a first region and a second region. The thickness of the second region is greater than the thickness of the first region. Along the second direction Y, the first region is correspondingly disposed with respect to the groove 51. The first region is located between the pressure relief member 40 and the reinforcing beam 202. Along the second direction Y, the orthographic projection of the second region does not overlap with the orthographic projection of the reinforcing beam 202.

[0133] See in some examples Figure 6 and Figure 9 As shown, the pressure relief component 40 includes a drainage channel 42. The drainage channel 42 communicates with the recess 41.

[0134] In the event of water (e.g., rainwater) entering the recess 41, the water in the recess 41 can be discharged through the drainage channel 42, reducing the accumulation and retention of water in the recess 41, and reducing the possibility of corrosion of the pressure relief component 40 due to long-term water retention in the recess 41.

[0135] For example, the pressure relief member 40 is inclined. The end of the pressure relief member 40 near the front wall 21 is higher than the end of the pressure relief member 40 near the rear wall 22. A drainage channel 42 is provided at the end of the pressure relief member 40 near the rear wall 22. Water in the recess 41 can flow to the drainage channel 42 under the action of gravity and be discharged through the drainage channel 42. The inclined arrangement of the pressure relief member 40 facilitates the drainage of water from the recess 41.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage device, characterized in that, include: The housing includes a top frame, a front wall and a rear wall disposed opposite to each other along a first direction, and a top wall and a bottom wall disposed opposite to each other along a second direction. The top wall is fixed to the top frame, and the top frame includes a front beam facing the front wall. The first direction is perpendicular to the second direction. A battery device is disposed within the housing, and the battery device includes multiple battery modules; A pressure relief channel is located between the front wall and the battery device; A pressure relief component is disposed on the top wall and fixed to the front beam. Along the second direction, at least a portion of the pressure relief component is disposed opposite to the pressure relief channel. The pressure relief component is configured to open for pressure relief when the internal pressure of the housing reaches a threshold.

2. The energy storage device according to claim 1, characterized in that, The pressure relief component includes a weak portion configured to fracture in response to the internal pressure of the housing reaching a threshold, thereby opening the pressure relief component to release pressure. Along the second direction, at least a portion of the weak portion is disposed opposite to the pressure relief channel.

3. The energy storage device according to claim 2, characterized in that, Along the first direction, the distance between the weak part and the front beam is less than 5 mm.

4. The energy storage device according to claim 2 or 3, characterized in that, The weak part is annular and is arranged around the edge of the pressure relief component.

5. The energy storage device according to any one of claims 2 to 4, characterized in that, The pressure relief component includes a recess that faces away from the interior of the housing and is not in communication with the interior of the housing; The recess includes a base and a fixing part, a portion of the fixing part is fixed to the front beam, and the weak part is located in the base.

6. The energy storage device according to claim 5, characterized in that, The housing includes a support beam, which is fixed to the top frame. Both the front beam and the support beam are fixed to the pressure relief component. The top frame includes a left beam and a right beam arranged opposite each other along a third direction. The front beam, the left beam, and the right beam are all fixed to the support beam. The first direction, the second direction, and the third direction are perpendicular to each other.

7. The energy storage device according to claim 6, characterized in that, The support beam includes a first sub-support beam and a second sub-support beam. The first sub-support beam fixes the second sub-support beam and the front beam together, and the second sub-support beam fixes the left beam and the right beam together. The fixing part includes a first sub-fixing part fixed to the first sub-support beam and a second sub-fixing part fixed to the second sub-support beam.

8. The energy storage device according to claim 7, characterized in that, The support beam includes a third sub-support beam, which is fixedly connected to the second sub-support beam and the front beam. The fixing part includes a third sub-fixing part fixed to the third sub-support beam.

9. The energy storage device according to any one of claims 6 to 8, characterized in that, The housing includes a reinforcing beam that securely connects the front beam and the support beam. The base is disposed opposite to the reinforcing beam, which is located on the side of the pressure relief component facing the interior of the housing, and is configured to support the base.

10. The energy storage device according to claim 9, characterized in that, The energy storage device includes an elastic element connected to the base, the elastic element having a groove, and the reinforcing beam disposed in the groove.

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