Energy storage apparatus with explosion venting function, and energy storage system

Abstract

An energy storage apparatus with an explosion venting function, and an energy storage system. The energy storage apparatus comprises a case, a plurality of battery modules, explosion venting members and door panels, wherein the explosion venting members and the door panels are used for passive pressure relief of an accommodating cavity and being opened under different pressures of the accommodating cavity. An explosion venting form of the energy storage apparatus is a two-stage explosion venting form; when the explosion overpressure in the energy storage apparatus is lower than a set value, explosion venting is performed by means of the explosion venting members without opening the door panels, and the overall structure remains intact; and when internal overpressure caused by explosion exceeds another set value, explosion venting windows and the door panels are simultaneously opened for explosion venting, and the main structure remains intact, such that layered and staged explosion venting can be realized, thereby preventing the case from breaking apart.

Description

Energy storage device and energy storage system with explosion relief function

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on October 30, 2023, with application number 202322933093.0 and application name “Energy storage device and energy storage system with explosion relief function”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of energy storage equipment, and in particular to an energy storage device and an energy storage system with explosion relief function. Background Art

[0003] Energy storage devices offer high flexibility, reliability, and energy density, and are increasingly being used in large-scale photovoltaic and wind power generation to address intermittent power generation fluctuations. However, the large number of battery modules in energy storage devices can easily cause serious explosions.

[0004] Energy storage devices in the related art are equipped with explosion venting panels to promptly vent explosions in the event of an explosion. However, if the activation pressure of the explosion venting panels is relatively high, the panels may not activate in time during a small-scale explosion, resulting in a delay in pressure relief and potentially causing a larger explosion. If the activation pressure of the explosion venting panels is relatively low, all the explosion venting panels will be activated to vent the explosion, resulting in high explosion relief costs.

[0005] Application Contents

[0006] The embodiments of the present application provide an energy storage device and an energy storage system with an explosion relief function to solve the problems of easy disassembly of the energy storage device and high explosion relief costs.

[0007] In a first aspect, embodiments of the present application provide an energy storage device with explosion-proofing functionality, comprising a housing, multiple battery modules, an explosion-proofing member, and a door panel. The housing comprises a top wall, a bottom wall, and side walls, wherein the bottom, side, and top walls enclose a chamber. The multiple battery modules are positioned within the chamber, the explosion-proofing member is connected to the top wall or the side wall, and the door panel is connected to the side wall to open or close the chamber. The explosion-proofing member and door panel are configured to open at different pressures within the chamber. The explosion-proofing member and door panel in this embodiment are primarily used in scenarios where a battery module explosion occurs, requiring the explosion-proofing member and door panel to react quickly and stably to reduce the pressure within the chamber and prevent the housing from disintegrating. Because the explosion-proofing member and door panel are configured to open and release pressure at different chamber pressures, the energy storage device in this embodiment achieves two-stage pressure relief. When the pressure within the chamber reaches the activation pressure of the explosion-proofing member, the explosion-proofing member opens the chamber, thereby achieving a single-stage explosion relief for the chamber. When the pressure in the accommodating chamber reaches the starting pressure of the door panel, at this time, the explosion relief parts and the door panel will be opened, thereby realizing the secondary explosion relief of the accommodating chamber. The energy storage device in this embodiment adopts a two-stage explosion relief scheme, which is not only suitable for the case of large-equivalent explosions, but also can timely relieve the explosion through the explosion relief parts and the door panel to prevent the energy storage device from disintegrating and improving safety. It is also suitable for the case of small-equivalent explosions, and can timely relieve the explosion. In addition, in the case of small-equivalent explosions, only one-stage explosion relief can meet the explosion relief requirements, and will not cause damage to the door panel, reducing the cost of explosion relief. In addition, by utilizing the entire door panel for explosion relief, the explosion relief capacity of the energy storage device can be improved. Since the door panel is a necessary component of the energy storage device, it will inevitably occupy a part of the area of ​​the outer surface of the box. By energizing the door panel, the door panel can not only play the role of its own opening and closing accommodating chamber, but also play the role of explosion relief during the explosion, making the door panel functionally diverse.

[0008] In some embodiments based on the first aspect, the second explosion relief member further comprises a zipper connected between the housing and the door panel to limit the opening angle of the door panel when the accommodating chamber is depressurized. Because one end of the zipper is detachably fixed to the door panel and the other end of the zipper is fixed to the housing, the zipper can limit the opening angle of the door panel relative to the housing when secondary explosion relief occurs.

[0009] In some embodiments based on the first aspect, the zipper is located outside the accommodating cavity, so that when the door panel is not used for explosion relief, the door can be opened and closed normally. Specifically, when opening the door, since the zipper is located outside the accommodating cavity, one end of the zipper can be easily detached from the door panel, and the door can be opened normally. After closing the door, it is also convenient to fix one end of the zipper to the door panel.

[0010] In some embodiments based on the first aspect, the door panel further includes a locking assembly, the locking assembly being connected to the box body and the door panel, the locking assembly including a locked state, an unlocked state and a failure state, and in the failure state, the door panel can achieve passive pressure relief of the accommodating chamber. In this embodiment, when the pressure in the accommodating chamber reaches the starting pressure of the door panel, the locking assembly is in a failure state. In the failure state, the locking assembly no longer performs the function of locking or unlocking the door panel. At this time, the door panel can move relative to the box body, and under the action of the pressure in the accommodating chamber, the door panel will be opened, thereby achieving passive pressure relief of the accommodating chamber through the door panel, and the locking assembly is cheaper than the door panel. When venting an explosion, the cost of venting an explosion can be reduced by damaging the locking assembly and rendering it ineffective.

[0011] In some embodiments based on the first aspect, the energy storage device further includes a locking member and a mating member, the locking member being connected to the door panel, the mating member being connected to the side wall, the locking member and the mating member being connected to lock the door panel and the side wall, and the locking member and the mating member being disconnected when the pressure in the accommodating chamber reaches a threshold value, thereby unlocking the door panel from the side wall. In this embodiment, energizing the locking member and the mating member increases their functional diversity. Furthermore, due to their small size, energizing the locking member and the mating member is easier.

[0012] In some embodiments based on the first aspect, a weak location is provided on the locking component and / or the mating component, wherein the strength of the weak location is lower than the strength of a non-weak location of the locking component and a non-weak location of the mating component, and the weak location is configured to disconnect the locking component and / or the mating component from the weak location when the pressure in the accommodating chamber reaches a threshold value. In this embodiment, by providing the locking component and / or the mating component with a weaker weak location, the locking component and / or the mating component can be more easily disconnected from the weak location after being subjected to an external force (such as torque, tension, etc.).

[0013] In some embodiments based on the first aspect, the locking member is a rod-shaped structure having opposite ends, one end of the locking member is connected to the door panel, and the other end of the locking member is configured to connect to the mating member, and the weak position is located between the two ends of the locking member. In this embodiment, the weak position is located between the two ends of the locking member, so that when the locking member is disconnected from the weak position, the locking member and the mating member no longer limit the door panel and the side wall, and the door panel can be opened relative to the side wall.

[0014] In some embodiments based on the first aspect, a groove is provided between the ends of the locking member, forming the weak point on the locking member. The groove is configured to cause the locking member to break at the groove when the pressure within the accommodating chamber reaches a threshold. In this embodiment, the weak point is formed on the locking member by providing the groove, which facilitates operation and easily controls the strength it can withstand, thereby reducing manufacturing costs.

[0015] In some embodiments based on the first aspect, the locking member is located in the accommodating cavity, and the locking member is separated from the weak position into a first section and a second section, the first section is fixedly connected to the door panel, and the second section is used to be fixedly connected to or disconnected from the matching member fixed to the box body, and the door panel also includes a zipper, one end of the zipper is fixedly connected to the first section, and the other end of the zipper is fixedly connected to the second section, and when the locking member is broken from the weak position, the second section is fixedly connected to the matching member. In this embodiment, when the pressure in the accommodating cavity is greater than the starting pressure of the door panel, the locking member is disconnected into the first section and the second section, at this time, the first section is still fixedly connected to the door panel, and the second section is fixedly connected to the matching member, so that the zipper can limit the opening angle of the door panel to prevent the door panel from opening too much, causing the components in the accommodating cavity to fly out and injure people. In addition, when the first section and the second section are not disconnected, when the locking assembly switches between the locked state and the unlocked state, since the first section and the second section and the zipper belong to a whole, the switching of the locking assembly between the locked state and the unlocked state will not be affected. At this time, the zipper will not limit the opening angle of the door panel, so that the door panel can be opened or closed normally. Moreover, the locking member is located inside the accommodating cavity, and the zipper is also located inside the accommodating cavity, which will not affect the overall appearance of the energy storage device, and the overall appearance is more beautiful.

[0016] In some embodiments based on the first aspect, the first section is provided with a first connecting portion, the second section is provided with a second connecting portion, the first connecting portion is provided with a first connecting hole, the second connecting portion is provided with a second connecting hole, one end of the zipper is fixedly connected to the first connecting hole, and the other end of the zipper is fixedly connected to the second connecting hole.

[0017] In some embodiments based on the first aspect, the door panel also includes a second limiting portion, and the second limiting portion includes a limiting state and a non-limiting state. In the limiting state, the second limiting portion can limit the disengagement of the locking component and the mating component, that is, when the locking assembly is in the locked state and the second limiting portion is in the limiting state, the locking assembly cannot be transformed from the locked state to the unlocked state. In the non-limiting state, the locking component can be normally disengaged from the mating component, and the locking assembly can normally be transformed from the locked state to the unlocked state.

[0018] In some embodiments based on the first aspect, a limiting hole is provided on the second section, and the second limiting portion includes an inserting rod portion and a gripping portion. When the second limiting portion is in a limiting state, the inserting rod portion is inserted into the limiting hole, thereby limiting the rotation of the locking member, thereby limiting the locking member from disengaging from the mating member. At this time, the locking assembly cannot be switched from the locked state to the unlocked state. By pulling the gripping portion, the inserting rod portion is pulled out of the limiting hole, and the second limiting portion is switched to a non-limiting state. At this time, the locking member can be normally disengaged from the mating member. In addition, under the restriction of the second limiting portion, it can be further ensured that when the first section and the second section are disconnected, the second section can maintain a fixed connection with the mating member.

[0019] In some embodiments based on the first aspect, a window is provided on the door panel, and the explosion relief component is sealed and connected to the window. In this embodiment, the explosion relief component is connected to the window on the door panel, which can effectively utilize the outer surface of the box occupied by the door panel. When the pressure in the accommodating chamber reaches the starting pressure of the explosion relief component, only the explosion relief component opens relative to the window. When the pressure in the accommodating chamber reaches the starting pressure of the door panel, the door panel opens relative to the box to achieve secondary explosion relief and pressure relief. In addition, the fire-fighting pipe is usually arranged on the top wall of the box. Since the top wall is not provided with an explosion relief component, the strength of the top wall is sufficient to meet the requirements of setting up the fire-fighting pipe, so as to improve the connection strength of the fire-fighting pipe.

[0020] In some embodiments based on the first aspect, the energy storage device includes a plurality of partitions arranged at intervals along a first direction and dividing the accommodating chamber into a plurality of accommodating sub-chambers. The plurality of battery modules are disposed within the plurality of accommodating sub-chambers. The plurality of door panels are provided corresponding to the plurality of accommodating sub-chambers, and each door panel is configured to passively relieve pressure in at least one of the accommodating sub-chambers. In this embodiment, the partitions separate the accommodating chambers into the plurality of accommodating sub-chambers, and the door panels correspond to the accommodating sub-chambers. Thus, if a battery module in a different accommodating sub-chamber explodes, the partitions can reduce the impact on battery modules in other accommodating sub-chambers. Furthermore, each door panel is configured to passively relieve pressure in at least one of the accommodating sub-chambers. Consequently, the pressure in the exploded accommodating sub-chamber is different in a short period of time than in other accommodating sub-chambers that have not exploded. Consequently, the door panel corresponding to the exploded accommodating sub-chamber is prioritized for explosion relief. If the explosion is relieved in a timely manner, the other door panels are not required to relieve pressure, thereby reducing explosion relief costs.

[0021] In some embodiments based on the first aspect, the housing includes a top wall and a bottom wall, the explosion relief member is connected to the top wall, and the door panel is connected to the side wall. This improves the utilization rate of the housing's circumferential surface, increases the effective area ratio of the explosion relief member and the door panel, and thus enhances the explosion relief capability of the energy storage device in this embodiment.

[0022] In some embodiments based on the first aspect, the housing includes a bottom wall, a top wall, and side walls connecting the top and bottom walls, wherein the explosion relief component constitutes the top wall. In this embodiment, the entire top wall of the housing comprises the explosion relief component. When the pressure within the accommodating chamber reaches the activation pressure of the explosion relief component, the explosion relief component activates, that is, the entire top wall of the housing is opened, thereby effectively increasing the primary explosion relief capacity of the energy storage device.

[0023] In a second aspect, an embodiment of the present application provides an energy storage system, comprising a power converter and an energy storage device as described in any one of the first aspects, wherein the power converter is connected to the energy storage device to perform power conversion on the current input into or output from the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0025] FIG1 is an application scenario diagram of an energy storage system provided in an embodiment of the present application;

[0026] FIG2 is a schematic structural diagram of an energy storage device provided in an embodiment of the present invention;

[0027] FIG3 is a schematic structural diagram of an energy storage device provided in an embodiment of the present application;

[0028] FIG4 is a schematic diagram of a portion of the structure of the energy storage device in FIG3 ;

[0029] FIG5 is a schematic structural diagram of a box body of the energy storage device in FIG3 ;

[0030] FIG6 is a schematic structural diagram of the box body of the energy storage device in FIG2 ;

[0031] FIG7 is a schematic structural diagram of the locking assembly of the energy storage device in FIG3 when in a locked state;

[0032] FIG8 is a schematic structural diagram of the locking assembly of the energy storage device in FIG3 when it is in an unlocked state;

[0033] FIG9 is a partial enlarged schematic diagram of point A in FIG6 ;

[0034] FIG10 is a schematic diagram of the exploded structure of the locking assembly in FIG7 ;

[0035] FIG11 is a schematic structural diagram of another connection position of a zipper provided in an embodiment of the present application;

[0036] FIG12 is a schematic diagram of a portion of the structure of the energy storage device in FIG3 ;

[0037] FIG13 is a schematic structural diagram of another energy storage device provided in an embodiment of the present application.

[0038] Explanation of reference numerals: 1000, energy storage system; 1, energy storage device; 2, power converter; 101, accommodating chamber; 1011, accommodating sub-chamber; 10, box body; 11, top wall; 111, first opening; 12, bottom wall; 13, side wall; 131, front wall; 132, rear wall; 133, left wall; 134, right wall; 135, second opening; 20, explosion relief component; 31, door panel; 311, window; 32, zipper; 33, locking assembly; 331, matching component; 3311, locking portion; 3312, first limiting portion; 332, locking component; P0, weak position; 3321, groove; 3322, first section; 33 23. Second section; 3324. Slot; 3325. First connecting portion; 3326. Second connecting portion; 3327. First connecting hole; 3328. Second connecting hole; 3329. Limiting hole; 333. Lock core; 3331. Lock hole; 34. Second limiting portion; 341. Insertion rod portion; 342. Grip portion; 200. Battery module; 201. Battery pack; 300. Partition; 400. Fire protection system; 401. Fire pump; 402. Fire protection pipe. DETAILED DESCRIPTION

[0039] The following first explains some of the terms involved in the embodiments of this application.

[0040] The terms "first", "second", etc. in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] FIG1 is an application scenario diagram of an energy storage system 1000 provided in an embodiment of the present application, wherein FIG1 shows that the energy storage system 1000 is applied in three scenarios: a power supply side, a power distribution side, and a user side.

[0042] 1 , the application scenario in FIG1 is provided with three energy storage systems 1000 provided in an embodiment of the present application, which are located at a power supply side, a power distribution side, and a user side, respectively.

[0043] The energy storage system 1000 includes an energy storage device 1 and a power converter 2 . The energy storage device 1 is connected to the power converter 2 so that the power converter 2 performs power conversion on the current input to the energy storage device 1 or the current output from the energy storage device 1 .

[0044] In some embodiments, the energy storage system 1000 located on the power supply side provides storage and output management for the electric energy output by the DC source, helping the DC source on the power supply side maintain output stability, optimizing the power generation output curve, providing system inertia and frequency and peak regulation functions, increasing the proportion of renewable energy power generation, and optimizing the energy structure.

[0045] Specifically, the DC power output by the DC source passes through the power converter 2 and is input into the energy storage device 1 . At this time, the power converter 2 performs DC-DC conversion and transmits the current input by the DC source to the energy storage device 1 .

[0046] The DC source can be a photovoltaic cell, a wind power generation device, a thermal power generation device, etc.

[0047] In some implementations, energy storage system 1000, located on the distribution side, provides intelligent load management for the transmission and distribution side, enabling timely peak and frequency regulation based on grid load conditions. Energy storage system 1000 enables capacity expansion, backup power, and other functions, allowing for increased renewable energy on the transmission and distribution side, ensuring safe, stable, efficient, and cost-effective operation of the grid.

[0048] Specifically, the current transmitted from the power supply side is transmitted to the user side through the transmission grid, and when the power is sufficient, the grid converts part of the electric energy through the power converter 2 and inputs it into the energy storage device 1, and when needed, it is output to the user side through the grid. At this time, the power converter 2 is used to convert the AC power transmitted by the grid into DC power, and then transmits the DC power to the energy storage device 1 for storage, and when needed, it converts the DC into AC and outputs it to the user side through the grid.

[0049] In some implementations, the user-side energy storage system 1000 provides users with peak load shaving and valley filling, as well as stable power quality management. This system can be applied in large-scale industrial, commercial, and residential sectors, as well as emerging areas such as communication base station backup power, UPS backup power, island microgrids, and smart solar-storage-charging-inspection charging stations. This system achieves electricity coverage, reduces social electricity costs, improves user-side power security, and maximizes energy utilization for social and economic benefits.

[0050] Specifically, the AC power transmitted from the distribution side is converted from AC to DC by the power converter 2 and then transmitted to the energy storage device 1 for backup. When the electrical equipment at the user end needs to use electric energy, the DC power can be output by the energy storage device 1, and the DC power is converted into AC power by the power converter 2 and transmitted to the user's electrical equipment. It can be understood that the electrical equipment at the user end refers to the electrical equipment that needs to use electric energy.

[0051] FIG2 is a schematic structural diagram of an energy storage device 1 provided in an embodiment of the present invention.

[0052] In some embodiments, the energy storage device 1 includes a box body 10, a door panel 31 and multiple battery modules 200. The box body 10 is surrounded to form a accommodating cavity 101. The multiple battery modules 200 are located in the accommodating cavity 101. Electricity is stored or output through the multiple battery modules 200.

[0053] The door panel 31 is connected to the box body 10 , and the accommodating cavity 101 can be opened or closed through the door panel 31 .

[0054] In some embodiments, the door panel 31 is used as a single-stage explosion relief component of the energy storage device 1. When the pressure in the accommodating chamber 101 reaches the connection strength between the door panel 31 and the box body 10, the door panel 31 is at least partially separated from the box body 10, thereby realizing single-stage explosion relief of the door panel 31. In this embodiment, the door panel 31 can be energized so that the door panel 31 has an explosion relief function to improve the safety of the energy storage device 1.

[0055] However, in the scheme of single-stage explosion relief through the door panel 31, it is more difficult to set the starting pressure for the door panel 31 to relieve the explosion. For example, when the starting pressure for the door panel 31 to relieve the explosion is designed to be low, when a small number of battery modules 200 explode in the accommodating chamber 101, the door panel 31 can smoothly open the accommodating chamber 101, thereby timely venting the explosion. However, as a relatively important component of the energy storage device 1, the door panel 31 has certain design requirements for the connection strength between the door panel 31 and the box body 10. When the connection strength between the door panel 31 and the box body 10 is relatively high, it will make it difficult for the door panel 31 and the box body 10 to be disconnected. In other words, the connection strength between the door panel 31 and the box body 10 is not as good as the connection strength between the door panel 31 and the box body 10. This means that when the door panel 31 requires a smaller starting pressure as a single-stage explosion relief component, the connection strength between the door panel 31 and the box body 10 when used to open and close the door cannot be met. In order to ensure that the connection strength between the door panel 31 and the box body 10 when used to open and close the door can reach the required design strength, the starting pressure of the door panel 31 used for single-stage explosion relief will be relatively high. If the amount of gas generated by the explosion is not large enough, the pressure in the accommodating chamber 101 fails to reach the starting pressure of the door panel 31. At this time, the door panel 31 will not open, and the air pressure in the accommodating chamber 101 cannot be relieved in time, which may lead to further and more serious explosions in the accommodating chamber 101.

[0056] It should be noted that the activation pressure refers to the pressure at which the door panel 31, when used as a single-stage explosion relief component, will exert its explosion relief function when subjected to a pressure reaching the activation pressure. Specifically, when the pressure within the accommodating chamber 101 reaches the activation pressure, the door panel 31 will at least partially separate from the box body 10, thereby achieving the explosion relief function.

[0057] FIG3 is a schematic structural diagram of an energy storage device 1 provided in an embodiment of the present application; FIG4 is a schematic structural diagram of a portion of the energy storage device 1 in FIG3 ; and FIG5 is a schematic structural diagram of a portion of the energy storage device 1 in FIG3 .

[0058] 3-5 , the energy storage device 1 includes a housing 10 and a plurality of battery modules 200 . The housing 10 is enclosed to form a receiving cavity 101 . The plurality of battery modules 200 are located in the receiving cavity 101 . Electricity is stored or outputted through the plurality of battery modules 200 .

[0059] The battery module 200 includes multiple battery packs 201 (packs), and the battery pack 201 includes multiple battery cells. It can be understood that when a battery cell explodes, a large amount of gas will be generated. The more battery cells that explode, the greater the amount of gas generated, the higher the pressure in the accommodating cavity 101, and the easier it is for the box 10 to disintegrate.

[0060] In some embodiments, the energy storage device 1 further includes an explosion relief member 20 connected to the box body 10 and a door panel 31 connected to the box body 10 . Both the explosion relief member 20 and the door panel 31 can relieve explosion and pressure of the accommodating cavity 101 by opening the accommodating cavity 101 .

[0061] In some embodiments, when the explosion relief member 20 and the door panel 31 are connected to the box body, the accommodating chamber 101 is in a sealed state. Of course, in some embodiments, the accommodating chamber 101 may also be incompletely sealed.

[0062] In some embodiments, the energy storage device 1 further includes a battery management system (BMS), which is primarily used to intelligently manage and maintain each battery module 200 , prevent overcharging and over-discharging of the battery pack 201 , extend the service life of the battery pack 201 , and monitor the status of the battery pack 201 .

[0063] In some embodiments, the energy storage device 1 further includes an air conditioning system, which is used to dissipate heat and keep the battery module 200 warm, thereby improving the working performance of the battery module 200 .

[0064] In some embodiments, the energy storage device 1 further includes a firefighting system 400, which is used to promptly prevent and extinguish fires in the event of a fire in the energy storage device 1. Specifically, the firefighting system includes a firefighting pump 401 and a firefighting pipe 402. The firefighting pump 401 is connected to an external firefighting source and is used to pump a firefighting medium into the firefighting pipe 402, which is then discharged through the firefighting pipe 402 to provide firefighting relief. The firefighting medium can be either water or gas.

[0065] In some embodiments, the fire-fighting pipe 402 is arranged on the top wall 11 of the box body 10 so as to increase the spraying area.

[0066] FIG6 is a schematic structural diagram of the box body 10 of the energy storage device 1 in FIG2 .

[0067] 6 , in some embodiments, the box body 10 includes a top wall 11, a bottom wall 12, and a side wall 13, wherein the side wall 13 is connected between the top wall 11 and the bottom wall 12 and encloses a receiving chamber 101, wherein the connection strength of the bottom wall 12, the side wall 13, and the top wall 11 basically determines the upper limit of the pressure bearing capacity of the box body 10. It is understandable that, in some other embodiments, the upper limit of the pressure bearing capacity of the box body 10 may also be determined by the structural strength of the top wall 11, the bottom wall 12, and the side wall 13. It should be noted that the upper limit of the pressure bearing capacity refers to the case where the pressure in the receiving chamber 101 reaches a threshold value, the box body 10 disintegrates or disconnects, and at this time, the pressure in the receiving chamber 101 that reaches the threshold value is the upper limit of the pressure bearing capacity of the box body 10.

[0068] In some embodiments, the side wall 13 includes a front wall 131, a rear wall 132, a left wall 133 and a right wall 134, the front wall 131 and the rear wall 132 are opposite, the left wall 133 and the right wall 134 are opposite, and the top wall 11, the bottom wall 12, the front wall 131, the rear wall 132, the left wall 133 and the right wall 134 are connected to form a box body 10 that is roughly in the shape of a rectangular parallelepiped.

[0069] It should be noted that the present application does not impose any specific limitation on the shape of the box body 10. For example, in some embodiments, the box body 10 may be roughly in the shape of a cube, a cylinder, a prism, or the like.

[0070] 3-6 , in some embodiments, the explosion venting member 20 and the door panel 31 are primarily used to vent explosions and relieve pressure in the accommodating chamber 101. Specifically, when a battery module 200 explodes in the accommodating chamber 101 and a large amount of gas is generated, the explosion venting member 20 and the door panel 31 open relative to the housing 10, allowing the accommodating chamber 101 to communicate with the outside world, thereby achieving passive explosion venting of the accommodating chamber 101. The explosion venting member 20 and the door panel 31 in this embodiment are primarily used in scenarios where the battery module 200 explodes, requiring the explosion venting member 20 and the door panel 31 to react stably and quickly to reduce the gas pressure in the accommodating chamber 101 and prevent the housing 10 from disintegrating. When the explosion venting component 20 and the door panel 31 are venting the explosion, the explosion venting component 20 and the door panel 31 are passively opened relative to the box body 10. It should be noted that passive opening refers to the deformation or damage of the structure of the explosion venting component 20 and the door panel 31 under the action of pressure, thereby starting the explosion venting and pressure relief function. The passive pressure relief of the accommodating chamber 101 in this application refers to passive explosion relief and pressure relief, which refers to the explosion relief method performed when the explosion venting component 20 and the door panel 31 are passively started. It can be understood that passive is relative to active. Active explosion relief requires active control by sensors and controllers, while passive explosion relief does not require the control of sensors and controllers, and can directly provide feedback on the pressure in the accommodating chamber 101. Therefore, passive explosion relief is more timely and more stable than active explosion relief.

[0071] Specifically, the explosion venting component 20 is set with a specific activation pressure when it leaves the factory. The activation pressure of the explosion venting component 20 refers to the explosion venting function that the explosion venting component 20 will exert when subjected to a pressure that reaches the activation pressure. For example, when the pressure within the accommodating chamber 101 is greater than or equal to the activation pressure of the explosion venting component 20, the explosion venting component 20 no longer serves to seal the accommodating chamber 101, but instead connects the accommodating chamber 101 to the outside world, thereby enabling exchange of gas with the outside world to reduce the pressure within the accommodating chamber 101. Similarly, the activation pressure of the door panel 31 is also set when it leaves the factory. The activation pressure of the door panel 31 refers to the explosion venting function that the door panel 31 will exert when subjected to a pressure that reaches the activation pressure. For example, when the pressure inside the accommodating chamber 101 is greater than or equal to the starting pressure of the door panel 31, the door panel 31 no longer serves to seal the accommodating chamber 101, but instead connects the accommodating chamber 101 with the outside world, thereby enabling exchange of gas with the outside world to reduce the pressure inside the accommodating chamber 101.

[0072] Compared to the energy storage device 1 in the embodiment of FIG2 , the explosion vent 20 and door panel 31 in this embodiment are used for passive pressure relief of the accommodating chamber 101 and are opened to relieve pressure at different pressures in the accommodating chamber 101. Because the explosion vent 20 and door panel 31 are used to open to relieve pressure at different pressures in the accommodating chamber 101, the energy storage device 1 in this embodiment can achieve two-stage pressure relief.

[0073] In some embodiments, the activation pressure of the explosion relief member 20 is lower than the activation pressure of the door panel 31. Assume that the activation pressure of the explosion relief member 20 is Pstat1, the activation pressure of the door panel 31 is Pstat2, and the pressure bearing capacity of the housing 10 is Pes, where Pstat2 = Pstat1 + ΔP1, Pes = Pstat2 + ΔP2, and ΔP1 and ΔP2 > 0.

[0074] Specifically, when the pressure Pstat2 within the accommodating chamber 101 exceeds Pred and exceeds Pstat1, the explosion venting component 20 opens the accommodating chamber 101, thereby achieving primary explosion venting of the accommodating chamber 101. It is understood that the magnitude of the pressure Pred within the accommodating chamber 101 depends on the number of exploded cells within the battery module 200 within the accommodating chamber 101. During primary explosion venting, the number of exploded cells is typically small, resulting in a smaller explosion equivalent, causing the pressure within the accommodating chamber 101 to be greater than the activation pressure of the explosion venting component 20 but less than the activation pressure of the door panel 31.

[0075] When the pressure in the accommodating chamber 101 satisfies the condition Pes>Pred>Pstat2, both the explosion relief member 20 and the door panel 31 will be opened, thereby achieving secondary explosion relief in the accommodating chamber 101. It is understood that during secondary explosion relief, a relatively large number of battery cells explode in the accommodating chamber 101, resulting in a large explosion equivalent, sufficient to activate the door panel 31 for rapid explosion relief. Furthermore, the explosion equivalent is less than the pressure-bearing capacity of the housing 10, thereby preventing the housing 10 from disintegrating.

[0076] Compared with the single-stage explosion relief scheme in the embodiment of FIG2 , the two-stage explosion relief scheme in this embodiment is not only applicable to the case of large-equivalent explosions, in which the explosion relief parts 20 and the door panel 31 are used to relieve the explosion in time, but is also applicable to the case of small-equivalent explosions, in which the explosion relief requirements can be met by only one-stage explosion relief, without causing damage to the door panel 31, thereby reducing the explosion relief cost.

[0077] In this embodiment, the door panel 31 is used to relieve the pressure of the accommodating chamber 101, and the activation pressure of the door panel 31 is greater than the activation pressure of the explosion relief member 20. As can be seen from FIG2 , the strength of the connection between the door panel 31 and the housing 10 when used to open and close the door is positively correlated with the activation pressure when the door panel 31 is used for explosion relief. In this embodiment, a two-stage explosion relief scheme is implemented by the explosion relief member 20 and the door panel 31. When a small-equivalent explosion occurs in the accommodating chamber 101, effective explosion relief and pressure relief can be achieved by activating the explosion relief member 20. At this time, the door panel 31 does not need to activate the pressure relief function, thereby ensuring the strength of the connection between the door panel 31 and the housing 10 when used to open and close the door. When a larger-equivalent explosion occurs in the accommodating chamber 101, explosion relief and pressure relief can be achieved by activating the door panel 31 and the explosion relief member 20 at the same time. As a result, this embodiment can effectively resolve the technical contradiction existing in the solution of using the door panel 31 as a single-stage explosion relief in the embodiment of Figure 2 (the larger design strength required for the door panel 31 when used to open and close the door is inconsistent with the smaller starting pressure required for the door panel 31 as a single-stage explosion relief component).

[0078] It should be noted that the area ratio of the explosion relief member 20 and the door panel 31 relative to the outer surface of the box body 10 in this embodiment is not limited and can be designed specifically according to different needs.

[0079] 3-6 , in some embodiments, the explosion venting component 20 includes an explosion venting plate, which is connected to the box body 10 via explosion venting screws. When the pressure in the accommodating chamber 101 reaches the starting pressure of the explosion venting component 20 , the explosion venting screws no longer fix the explosion venting plate to the box body 10. Under the action of the pressure in the accommodating chamber 101, the explosion venting plate opens the accommodating chamber 101, thereby achieving a rapid reduction in the pressure in the accommodating chamber 101.

[0080] In some other implementations, the explosion relief component 20 may also be a magnetic explosion relief component or an explosion relief plate.

[0081] In some embodiments, the explosion venting member 20 is connected to the top wall 11. Specifically, a first opening 111 is formed on the top wall 11, and the first opening 111 connects the accommodating chamber 101 to the outside world. The explosion venting member 20 is connected to the first opening 111 on the top wall 11 and seals the first opening 111. When the pressure in the accommodating chamber 101 reaches the activation pressure of the explosion venting member 20, the explosion venting member 20 opens the first opening 111, and the accommodating chamber 101 connects to the outside world through the first opening 111, thereby achieving explosion and pressure relief through the explosion venting member 20.

[0082] It is understandable that the number of explosion relief members 20 can be one or more, and the number of first openings 111 provided on the top wall 11 can also be one or more.

[0083] In some embodiments, the housing 10 includes a bottom wall 12, a top wall 11, and a side wall 13 connecting the top wall 11 and the bottom wall 12, wherein the explosion relief member 20 constitutes the top wall 11. In this embodiment, the entire top wall 11 of the housing 10 is the explosion relief member 20. When the pressure in the accommodating chamber 101 reaches the activation pressure of the explosion relief member 20, the explosion relief member 20 is activated. In other words, the entire top wall 11 of the housing 10 is opened, thereby effectively increasing the primary explosion relief capability of the energy storage device 1.

[0084] It is understandable that, in some other embodiments, the explosion relief member 20 may also be provided on the side wall 13 .

[0085] 3 to 6 , in some embodiments, a portion of the door panel 31 is used to relieve pressure in the accommodating chamber 101 .

[0086] In some embodiments, a portion of the door panel 31 is used to relieve pressure in the accommodating chamber 101. When the pressure in the accommodating chamber 101 reaches the activation pressure of the door panel 31, the portion of the door panel 31 used to relieve pressure in the accommodating chamber 101 falls off or separates from the other portions of the door panel 31, thereby opening an explosion vent in the door panel 31, allowing the accommodating chamber 101 to communicate with the outside world, thereby achieving explosion relief in the accommodating chamber 101. In this embodiment, since at least a portion of the door panel 31 is used to relieve pressure in the accommodating chamber 101, the surface area of ​​the housing 10 occupied by the door panel 31 can be effectively utilized. While ensuring that the pressure bearing capacity of the housing 10 is sufficiently large, the area ratio of the explosion relief member 20 and the door panel 31 relative to the outer surface area of ​​the housing 10 can be increased, thereby improving the explosion relief capability of the energy storage device 1. In addition, the door panel 31 can be energized to increase the explosion relief function of the door panel 31, thereby improving the explosion relief capability of the energy storage device 1.

[0087] In some embodiments, the entire door panel 31 is used to relieve pressure in the accommodating chamber 101. In this case, when the door panel 31 is venting an explosion, the entire door panel 31 can be opened relative to the box body 10 to relieve pressure in the accommodating chamber 101. In this embodiment, by utilizing the entire door panel 31 for explosion relief, the explosion relief capability of the energy storage device 1 can be improved. Specifically, since the door panel 31 is a necessary component of the energy storage device 1, it will inevitably occupy a portion of the outer surface area of ​​the box body 10. By energizing the door panel 31, the door panel 31 can not only play the role of opening and closing the accommodating chamber 101 itself, but also play the role of venting the explosion, making the door panel 31 functionally diverse.

[0088] In some embodiments, the door panel 31 is connected to the side wall 13. Specifically, a second opening 135 is provided on the side wall 13, and the second opening 135 connects the accommodating cavity 101 with the outside world. The door panel 31 is connected to the second opening 135 of the side wall 13 and can move relative to the side wall 13 to open or close the second opening 135, thereby opening or closing the accommodating cavity 101.

[0089] In some embodiments, the door panel 31 may be provided on at least one of the front wall 131 , the rear wall 132 , the left wall 133 , and the right wall 134 .

[0090] In some embodiments, the door panel 31 may also be disposed on the top wall 11 .

[0091] It is understandable that the number of door panels 31 can be one or more, and the number of second openings 135 provided on the side wall 13 can also be one or more.

[0092] In some embodiments, the explosion relief component 20 is connected to the top wall 11, and the door panel 31 is connected to the side wall 13, thereby improving the utilization rate of the peripheral surface of the box body 10 and increasing the effective area ratio of the explosion relief component 20 and the door panel 31, thereby improving the explosion relief capacity of the energy storage device 1 in this embodiment.

[0093] FIG7 is a schematic structural diagram of the locking assembly 33 of the energy storage device 1 in FIG3 when it is in a locked state; FIG8 is a schematic structural diagram of the locking assembly 33 of the energy storage device 1 in FIG3 when it is in an unlocked state.

[0094] 6-8 , in some embodiments, the energy storage device 1 further includes a locking assembly 33 , which is connected to the housing 10 and the door panel 31 , and the locking assembly 33 includes a locked state, an unlocked state, and an invalid state. In the locked state, the locking assembly 33 fixes the door panel 31 to the housing 10 , and the door panel 31 is in a state where the accommodating cavity 101 is not opened. In the unlocked state, the locking assembly 33 no longer has a limiting effect on the door panel 31 and the housing 10 , and the door panel 31 can open the accommodating cavity 101 . In the invalid state, the locking assembly 33 also no longer has a limiting effect on the door panel 31 and the housing 10 , and the door panel 31 can open the accommodating cavity 101 . The main difference between the unlocked state and the failed state is that the unlocked state is the state when the pressure in the accommodating chamber 101 is at a normal value, while the failed state is the state when the pressure in the accommodating chamber 101 is greater than or equal to the threshold value (that is, the starting pressure of the door panel 31), and at this time the locking assembly 33 no longer has a locked state and an unlocked state.

[0095] Specifically, when the pressure within the accommodating chamber 101 is less than the activation pressure of the door panel 31, the door panel 31 is not used to vent the accommodating chamber 101, and the locking assembly 33 primarily switches between a locked state and an unlocked state. When the pressure within the accommodating chamber 101 is greater than or equal to the activation pressure of the door panel 31, the locking assembly 33 no longer has a locked state or an unlocked state, but only a disabled state.

[0096] In the failed state, the locking assembly 33 also no longer limits the door panel 31 and the housing 10. Under the pressure of the accommodating chamber 101, the door panel 31 will be opened, thereby achieving explosion relief and pressure relief. In this embodiment, when the pressure in the accommodating chamber 101 reaches the activation pressure of the door panel 31, the locking assembly 33 is in the failed state, thereby enabling passive pressure relief of the accommodating chamber 101 through the door panel 31. By failing the locking assembly 33, explosion relief of the door panel 31 is achieved. The locking assembly 33 is cheaper when it intersects the door panel 31. During explosion relief, by damaging the locking assembly 33 and rendering it ineffective, the explosion relief cost can be reduced.

[0097] It is understood that the conditions for rendering the locking assembly 33 in an inoperative state vary and will depend on the specific structure of the locking assembly 33. For example, in some embodiments, the locking assembly 33 may be rendered inoperative by destroying its physical structure, such as by breaking or bending it. In another embodiment, the locking assembly 33 may be rendered inoperative by changing an external input parameter of the locking assembly 33. For example, if the locking assembly 33 utilizes a magnetic connection, the magnetic field may be eliminated by disconnecting the input current.

[0098] FIG9 is a partial enlarged schematic diagram of point A in FIG6 ; FIG10 is a schematic diagram of the exploded structure of the locking assembly 33 in FIG7 .

[0099] 6-10 , in some embodiments, the locking assembly 33 further includes a mating member 331 and a locking member 332. The mating member 331 is fixedly connected to the housing 10, such as to the side wall 13, and the locking member 332 is fixedly connected to the door panel 31. In the locked state, the mating member 331 is connected to the locking member 332. In the unlocked state, the mating member 331 and the locking member 332 are disconnected. In the failed state, that is, when the pressure in the accommodating chamber 101 reaches a threshold (that is, the activation pressure of the door panel 31), the locking member 332 and the mating member 331 are disconnected, thereby unlocking the door panel 31 from the side wall 13. In this embodiment, by energizing the locking member 332 and the mating member 331, the functional diversity of the locking member 332 and the mating member 331 can be increased. Moreover, since the locking member 332 and the mating member 331 are relatively small in size, energization is easy to implement.

[0100] In some embodiments, the locking member 332 and / or the mating member 331 is provided with a weak point P0. The strength of the weak point P0 is lower than that of the non-weak points of the locking member 332 and the non-weak points of the mating member 331. The weak point P0 is used to disconnect the locking member 332 and / or the mating member 331 from the weak point P0 when the pressure in the accommodating chamber 101 reaches a threshold. In this embodiment, by providing the locking member 332 and / or the mating member 331 with a weaker weak point P0, the locking member 332 and / or the mating member 331 can be more easily disconnected from the weak point P0 when subjected to external forces (such as torque, tension, etc.).

[0101] Specifically, the strength of the weak position P0 on the locking member 332 and / or the matching member 331 can be designed according to the actual starting pressure required by the door panel 31 .

[0102] In some embodiments, the locking member 332 is a rod-shaped structure with opposing ends. One end of the locking member 332 is connected to the door panel 31, and the other end of the locking member 332 is configured to connect to the mating member 331. The weak point P0 is located between the two ends of the locking member 332. In this embodiment, the weak point P0 is located between the two ends of the locking member 332. Therefore, when the locking member 332 is disconnected from the weak point P0, the locking member 332 and the mating member 331 no longer restrict the door panel 31 and the side wall 13, allowing the door panel 31 to open relative to the side wall 13.

[0103] Specifically, in the failed state, the locking member 332 disconnects from the weak position P0. After disconnection, a portion of the locking member 332 remains connected to the door panel 31, while a portion remains connected to the mating member 331. However, the locking member 332 and the mating member 331 can no longer securely connect the housing 10 and the door panel 31. At this point, if an explosion occurs within the accommodating chamber 101, the pressure within the accommodating chamber 101 can cause the door panel 31 to open relative to the housing 10, thereby releasing pressure.

[0104] It is understandable that when the pressure in the accommodating chamber 101 does not reach the starting pressure of the door panel 31, the locking member 332 will not be disconnected, and the locking assembly 33 can still normally switch between the locked state and the unlocked state.

[0105] In some embodiments, the locking member 332 is rotatably connected to the door panel 31. Specifically, when the locking member 332 is rotated to a certain position, the locking member 332 is locked and connected to the mating member 331, and is in a locked state. When the locking member 332 is rotated to another position, the locking member 332 is disconnected from the mating member 331, and is in an unlocked state.

[0106] In some embodiments, a lock core 333 is installed on the door panel 31, and a locking member 332 is connected to the lock core 333. The lock core 333 is provided with a lock hole 3331 for inserting a key. When the key is inserted into the lock hole 3331 and the key is rotated, the locking member 332 rotates and then connects or disconnects with the matching member 331 to switch between a locked state and an unlocked state.

[0107] In some embodiments, a groove 3321 is provided between the two ends of the locking member 332, forming the weak point P0 on the locking member 332. The groove 3321 is configured to cause the locking member 332 to break at the groove 3321 when the pressure within the accommodating chamber 101 reaches a threshold. In this embodiment, the weak point P0 is formed on the locking member by providing the groove 3321. This method facilitates operation and makes it easy to control the strength of the locking member that can withstand external forces, thereby reducing manufacturing costs.

[0108] In some other embodiments, a material with lower strength may be mixed at a certain position on the locking element 332 to form a weak position P0 of the locking element 332 .

[0109] In some embodiments, the locking member 332 is separated from the weak position P0 into a first section 3322 and a second section 3323. The first section 3322 is connected to the door panel 31, such as the lock core 333, and the second section 3323 is used to connect with the mating member 331. When the pressure in the accommodating chamber 101 reaches the activation pressure of the door panel 31, the locking member 332 is separated from the weak position P0 into the first section 3322 and the second section 3323. The first section 3322 remains fixedly connected to the door panel 31, while the second section 3323 remains fixedly connected to the mating member 331. However, since the locking member 332 is broken into two parts, the connection between the door panel 31 and the housing 10 cannot be established.

[0110] In some embodiments, the second section 3323 is provided with a slot 3324. The mating member 331 includes a snap-fit ​​portion 3311 and a first limiting portion 3312. When the locking assembly 33 is in the locked state, the slot 3324 snaps into the snap-fit ​​portion 3311 to be fixedly connected thereto. When the locking assembly 33 is in the unlocked state, the snap-fit ​​portion 3311 disengages from the slot 3324, and the second section 3323 is disconnected from the mating member 331. The first limiting portion 3312 is used to restrict the position of the locking member 332 in the locked state, thereby reducing the degree of freedom of the locking member 332.

[0111] In some embodiments, the door panel 31 further includes a zipper 32, one end of the zipper 32 is fixedly connected to the first section 3322, and the other end of the zipper 32 is fixedly connected to the second section 3323. When the pressure in the accommodating chamber 101 is greater than the starting pressure of the door panel 31, the locking member 332 is disconnected into the first section 3322 and the second section 3323. At this time, the first section 3322 and the door panel 31 are still fixedly connected, and the second section 3323 is connected to the matching member 331. The door panel 31 rotates around the rotating shaft of the door panel 31 to open the accommodating chamber 101. When the door panel 31 rotates around the rotating shaft of the door panel 31, the first section 3322 and the second section 3323 are both subjected to the pulling force of the zipper 32, and the pulling direction of the zipper 32 is consistent with the tangential direction of the rotation around the rotating shaft of the door panel 31. The first limiting portion 3312 can The second section 3323 is restricted from moving relative to the matching piece 331 in the tangential direction of the rotation around the door panel 31 axis, so that the second section 3323 of the locking piece 332 and the matching piece 331 can still maintain the connection with the matching piece 331 under the action of the pulling force of the zipper 32, so that the first section 3322 is fixedly connected to the door panel 31, the second section 3323 is fixedly connected to the matching piece 331, and the matching piece 331 is fixedly connected to the box body 10, so that the opening angle of the door panel 31 can be limited by the zipper 32 to prevent the door panel 31 from opening too large an angle, which may cause the components in the accommodating cavity 101 to fly out and injure people. In addition, when the first section 3322 and the second section 3323 are not disconnected, when the locking assembly 33 switches between the locked state and the unlocked state, since the first section 3322 and the second section 3323 and the zipper 32 are a whole, the switching of the locking assembly 33 between the locked state and the unlocked state will not be affected. At this time, the zipper 32 will not play a role in limiting the opening angle of the door panel 31, so that the door panel 31 can be opened or closed normally. Moreover, the locking member 332 is located inside the accommodating cavity 101, and the zipper 32 is also located inside the accommodating cavity 101, which will not affect the overall appearance of the energy storage device 1, and the overall appearance is more beautiful.

[0112] In some embodiments, the first section 3322 is provided with a first connecting portion 3325, the second section 3323 is provided with a second connecting portion 3326, the first connecting portion 3325 is provided with a first connecting hole 3327, the second connecting portion 3326 is provided with a second connecting hole 3328, one end of the zipper 32 is fixedly connected to the first connecting hole 3327, and the other end of the zipper 32 is fixedly connected to the second connecting hole 3328.

[0113] In some embodiments, the first connection hole 3327 is a threaded hole, and the second connection hole 3328 is a threaded hole. One end of the zipper 32 is threadedly connected to the first connection hole 3327, and the other end of the zipper 32 is threadedly connected to the second threaded hole.

[0114] In some embodiments, the energy storage device 1 further includes a second limiting portion 34, which includes a limiting state and a non-limiting state. In the limiting state, the second limiting portion 34 can limit the locking member 332 from disengaging from the mating member 331, that is, when the locking assembly 33 is in the locked state and the second limiting portion 34 is in the limiting state, the locking assembly 33 cannot be transformed from the locked state to the unlocked state. In the non-limiting state, the locking member 332 can be normally disengaged from the mating member 331, and the locking assembly 33 can normally be transformed from the locked state to the unlocked state.

[0115] In some embodiments, the second section 3323 includes a limiting hole 3329. The second limiting portion 34 includes a rod portion 341 and a grip portion 342. When the second limiting portion 34 is in the limiting state, the rod portion 341 is inserted into the limiting hole 3329, thereby restricting the rotation of the locking member 332, thereby preventing the locking member 332 from disengaging from the mating member 331. In this case, the locking assembly 33 cannot be switched from the locked state to the unlocked state. By moving the grip portion 342, the rod portion 341 is removed from the limiting hole 3329, and the second limiting portion 34 is switched to the unlimited state, at which point the locking member 332 can be normally disengaged from the mating member 331. In addition, under the restriction of the second limiting portion 34, it is further ensured that when the first section 3322 and the second section 3323 are disconnected, the second section 3323 can maintain a fixed connection with the mating member 331.

[0116] In some embodiments, the first limiting portion 3312 and the second limiting portion 34 (when in the limiting state) can limit the locking component 332 to zero degree of freedom relative to the matching component 331 .

[0117] It should be noted that the specific shape of the locking member 332 is not limited, and it can be, for example, a round rod, a square rod, or a rod-shaped structure of other shapes.

[0118] In some other embodiments, the connection position of the zipper 32 may not be on the locking member 332. FIG11 is a schematic structural diagram of another connection position of the zipper 32 provided in an embodiment of the present application.

[0119] Different from Figures 6 to 10, in the embodiment of Figure 11, one end of the zipper 32 is detachably fixedly connected to the door panel 31, and the other end of the zipper 32 is fixedly connected to the box body 10, so that when a secondary explosion relief occurs, the zipper 32 can limit the opening angle of the door panel 31 relative to the box body 10.

[0120] In some embodiments, the zipper 32 is located outside the accommodating cavity 101, so that when the door panel 31 is not used for explosion relief, the door can be opened and closed normally. Specifically, when opening the door, since the zipper 32 is located outside the accommodating cavity 101, it is convenient to detach one end of the zipper 32 from the door panel 31, and the door can be opened normally. After closing the door, it is also convenient to fix one end of the zipper 32 to the door panel 31.

[0121] In some embodiments, the weak point P0 is provided on the fitting 331 .

[0122] In some embodiments, the weak point P0 is provided on both the locking member 332 and the matching member 331 .

[0123] In some other embodiments, the locking member 332 and the fitting member 331 are magnetically connected. Specifically, the locking member 332 and / or the fitting member 331 are magnetic members. When the battery pack 201 in the accommodating chamber 101 explodes, the air pressure and temperature in the accommodating chamber 101 increase and reach a threshold value (the starting pressure of the door panel 31). The magnetic force of the magnetic member decreases significantly. Under the action of pressure, the magnetic attraction force between the locking member 332 and the fitting member 331 is not sufficient to resist the pressure of the air pressure on the door panel 31. At this time, the door panel 31 is open relative to the side wall 13.

[0124] FIG12 is a schematic diagram of a portion of the structure of the energy storage device 1 in FIG3 .

[0125] 12 , the energy storage device 1 further includes a plurality of partitions 300 , which are arranged at intervals along a first direction and divide the accommodating cavity 101 into a plurality of accommodating sub-cavities 1011 , and a plurality of battery modules 200 are arranged in the plurality of accommodating sub-cavities 1011 . Specifically, there is at least one battery module 200 in each accommodating sub-cavity 1011 . There are a plurality of door panels 31 , which are respectively arranged corresponding to the plurality of accommodating sub-cavities 1011 , and each door panel 31 is used to passively relieve pressure on at least one accommodating sub-cavity 1011 . In this embodiment, the storage chamber 1011 is divided into a plurality of accommodating sub-cavities 1011 by a partition 300, and the door panel 31 corresponds to the accommodating sub-cavity 1011, so that when the battery modules 200 in different accommodating sub-cavities 1011 explode, the partition 300 can reduce the impact on the battery modules 200 in other accommodating sub-cavities 1011. Moreover, each door panel 31 is used to passively relieve pressure on at least one accommodating sub-cavity 1011, so that the pressure value of the exploded accommodating sub-cavity 1011 in a short period of time is different from that of other non-exploded accommodating sub-cavities 1011, so that the door panel 31 corresponding to the exploded accommodating sub-cavity 1011 is given priority for explosion relief. If the explosion can be relieved in time, the other door panels 31 will no longer be relieved, thereby reducing the explosion relief cost.

[0126] In some embodiments, each door panel 31 is used to passively relieve pressure in one accommodating sub-cavity 1011 .

[0127] It is understandable that, in some other embodiments, one door panel 31 may correspond to the explosion relief of two or three accommodating sub-cavities 1011 .

[0128] FIG13 is a schematic structural diagram of another energy storage device 1 provided in an embodiment of the present application.

[0129] 13 , the energy storage device 1 includes a housing 10, a battery module 200, a fire extinguishing pipe 402, and an explosion venting member 20 and a door panel 31 connected to the housing 10. The housing 10 includes a top wall 11, a bottom wall 12, and a side wall 13. The specific structures of the battery module 200, the fire extinguishing pipe 402, the housing 10, the top wall 11, the bottom wall 12, the side wall 13, the explosion venting member 20, and the door panel 31 can be referred to in the previous embodiment. The specific structures and functions of the battery module 200, the fire extinguishing pipe 402, the housing 10, the top wall 11, the bottom wall 12, the side wall 13, the explosion venting member 20, and the door panel 31 will not be described in detail here. The main difference between this embodiment and the previous embodiment is the different connection position relationship between the explosion venting member 20 and the door panel 31 relative to the housing 10.

[0130] In some embodiments, a window 311 is provided on the door panel 31, and the explosion venting component 20 is sealedly connected to the window 311. In this embodiment, the fire duct 402 is arranged on the top wall 11, so the strength of the top wall 11 is highly required. However, the explosion venting component 20 is not provided on the top wall 11, which facilitates the installation of the fire duct 402 and improves the connection strength of the fire duct 402. The explosion venting component 20 is connected to the window 311 on the door panel 31, which can further effectively utilize the outer surface of the box body 10 occupied by the door panel 31. When the pressure in the accommodating chamber 101 reaches the activation pressure of the explosion venting component 20, only the explosion venting component 20 opens relative to the window 311. When the pressure in the accommodating chamber 101 reaches the activation pressure of the door panel 31, the door panel 31 opens relative to the box body 10 to achieve secondary explosion and pressure relief.

[0131] It is understandable that in some other embodiments, the explosion relief member and the door panel may also be respectively arranged at different positions of the side wall.

[0132] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. An energy storage device with explosion relief function, characterized in that: It includes a box body, multiple battery modules, an explosion-proof component and a door panel, the box body includes a top wall, a bottom wall and a side wall, the top wall, the bottom wall and the side wall enclose a receiving cavity; the multiple battery modules are located in the receiving cavity, the explosion-proof component is connected to the top wall or the side wall, the door panel is connected to the side wall to open or close the receiving cavity, and the explosion-proof component and the door panel are used to open under different pressures in the receiving cavity.

2. The energy storage device according to claim 1, characterized in that: The energy storage device further comprises a zipper connected between the box body and the door panel to limit the opening angle of the door panel when the accommodating chamber is depressurized.

3. The energy storage device according to claim 1, characterized in that: The energy storage device also includes a locking component and a matching component, wherein the locking component is connected to the door panel, and the matching component is connected to the side wall. The locking component and the matching component are connected so that the door panel is locked with the side wall. When the pressure in the accommodating chamber reaches a threshold value, the locking component and the matching component are disconnected so that the door panel is unlocked from the side wall.

4. The energy storage device according to claim 3, characterized in that: A weak position is provided on the locking component and / or the matching component, and the strength of the weak position is lower than the strength of the non-weak position of the locking component and the non-weak position of the matching component. The weak position is used for disconnecting the locking component and / or the matching component from the weak position when the pressure in the accommodating chamber reaches a threshold value.

5. The energy storage device according to claim 4, characterized in that: The locking member is a rod-shaped structure with opposite ends, one end of the locking member is connected to the door panel, and the other end of the locking member is used to connect with the matching member, and the weak position is located between the two ends of the locking member.

6. The energy storage device according to claim 5, characterized in that: A groove is provided between the two ends of the locking member to form the weak position on the locking member. The groove is used for the locking member to break from the groove when the pressure in the accommodating cavity reaches a threshold value.

7. The energy storage device according to any one of claims 4 to 6, characterized in that: The locking component is located in the accommodating cavity, and the locking component is separated into a first section and a second section from the weak position. The first section is fixedly connected to the door panel, and the second section is used to be fixedly connected to or disconnected from the matching component fixed on the box body. The energy storage device also includes a zipper, one end of the zipper is fixedly connected to the first section, and the other end of the zipper is fixedly connected to the second section. When the locking component is broken from the weak position, the second section is fixedly connected to the matching component.

8. The energy storage device according to any one of claims 1 to 7, characterized in that: A window is provided on the door panel, and the explosion relief component is sealed and connected to the window.

9. The energy storage device according to any one of claims 1 to 8, characterized in that: The energy storage device includes a plurality of partitions, which are arranged at intervals along a first direction and divide the accommodating cavity into a plurality of accommodating sub-cavities. A plurality of battery modules are arranged in the plurality of accommodating sub-cavities. A plurality of door panels are provided and are respectively corresponding to the plurality of accommodating sub-cavities. Each door panel is used for passively relieving pressure on at least one of the accommodating sub-cavities.

10. The energy storage device according to claim 9, characterized in that: The box body comprises a bottom wall, a top wall and a side wall connecting the top wall and the bottom wall, wherein the explosion relief component constitutes the top wall.

11. An energy storage system, characterized in that: It comprises a power converter and an energy storage device as described in any one of claims 1 to 10, wherein the power converter is connected to the energy storage device to perform power conversion on the current input to or output from the energy storage device.

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