End cap assembly, energy storage device, and electric appliance

Abstract

The application discloses an end cover assembly, an energy storage device and an electric equipment. The end cover assembly comprises an end cover, an explosion-proof valve and a lower plastic. The end cover comprises a first face and a second face opposite to each other. The end cover is provided with an explosion-proof hole penetrating through the first face and the second face. The explosion-proof valve is mounted on the end cover and seals the explosion-proof hole. The lower plastic is arranged on one side of the end cover where the first face is located. The lower plastic comprises a body part and an explosion-proof part. The body part comprises a first side and a second side. The second side faces the first face. The body part is provided with an outlet penetrating through the first side and the second side. The explosion-proof part protrudes from the first side in a direction away from the end cover. The explosion-proof part and the body part jointly form a cavity. One side of the explosion-proof part away from the body part is provided with an inlet. The cavity is in communication with the inlet and the outlet. The inlet is used for allowing fluid to flow into the cavity. The outlet is aligned with the explosion-proof valve and is used for allowing fluid to flow from the cavity to the explosion-proof hole. In a projection plane perpendicular to the thickness direction of the lower plastic, the projection of the inlet is staggered with the projection of the outlet.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to an end cap assembly, an energy storage device, and an electrical device. Background Technology

[0002] Secondary batteries and other energy storage devices are widely used as the main power source for electrical equipment due to their recyclability. As the demand for energy storage devices gradually increases, people's requirements for their performance in all aspects are also getting higher and higher, especially the requirements for the safety performance of energy storage devices.

[0003] During the operation of an energy storage device, if overcharging leads to excessive internal pressure, the flammable gases generated by the internal side reactions can directly surge upwards, breaking through the explosion-proof valve and flowing out through the corresponding explosion-proof port to the outside of the device, thus relieving pressure and ensuring the safety of the energy storage device to a certain extent. However, if thermal runaway simultaneously occurs within the battery cells, a partial short circuit may occur inside the cells. This partial short circuit generates a large amount of heat, which reacts with the flammable gases to produce sparks. If these sparks also shoot upwards towards the explosion-proof port, they can ignite the flammable gases flowing out through the broken explosion-proof valve, causing the energy storage device to catch fire, and its safety cannot be guaranteed. Summary of the Invention

[0004] In view of the above problems, this application provides an end cap assembly, an energy storage device, and an electrical device, which can solve the problem that the safety of the energy storage device cannot be guaranteed.

[0005] In a first aspect, this application provides an end cap assembly. The end cap assembly includes an end cap, an explosion-proof valve, and a lower plastic component. The end cap includes a first side and a second side facing away from each other. The end cap has an explosion-proof hole penetrating the first side and the second side. The explosion-proof valve is installed on the end cap and closes the explosion-proof hole. The lower plastic component is disposed on the side where the first side of the end cap is located. The lower plastic component includes a body portion and an explosion-proof portion. The body portion includes a first side and a second side. The second side faces the first side. The body portion has an outlet penetrating the first side and the second side. The explosion-proof portion protrudes from the first side in a direction away from the end cap. The explosion-proof portion and the body portion together form a cavity. The side of the explosion-proof portion facing away from the body portion has an inlet. The cavity is connected to both the inlet and the outlet. The inlet is used to allow fluid to flow into the cavity. The outlet is aligned with the explosion-proof valve and is used to allow the fluid to flow from the cavity to the explosion-proof hole. In a projection plane perpendicular to the thickness direction of the lower plastic component, the projection of the inlet and the projection of the outlet are offset.

[0006] In the end cap assembly of the above technical solution, when a partial short circuit occurs inside the energy storage device, the ejected fluid may carry sparks. The staggered design of the inlet and outlet prevents sparks from being directly ejected from the inlet to the outlet. Since the outlet is aligned with the explosion-proof valve, sparks will also not be ejected directly from the valve. Conversely, when the spark reaches the inlet of the lower plastic section, the projections of the inlet and outlet do not coincide, resulting in a misalignment. Therefore, after the fluid carrying the spark enters the inlet, its path is deflected within the cavity, preventing it from directly rushing out of the outlet and spraying upwards towards the explosion-proof port. This avoids igniting fluid that would otherwise rush out of the outlet and breach the explosion-proof valve. Therefore, the end cap assembly effectively prevents sparks from also spraying directly upwards towards the explosion-proof port, avoiding ignition of byproduct flammable gases or other fluids flowing outwards after breaching the explosion-proof valve, thus ensuring the safety of the energy storage device.

[0007] In addition, the main body includes a first side and a second side. The first side faces the interior of the energy storage device, while the second side faces the exterior. This allows the main body to effectively isolate the internal and external environments of the energy storage device and ensure that the interior of the energy storage device is protected from external interference. Furthermore, the main body is provided with an outlet that runs through the first and second sides, allowing fluids (such as liquids or gases) inside the energy storage device to flow out smoothly and to break through the explosion-proof valve to flow to the outside of the energy storage device, thereby achieving a pressure relief effect.

[0008] As an optional technical solution of this application, the lower plastic also includes a blocking member. The blocking member is disposed in the cavity and is located on the path of the spark carried by the fluid entering from the inlet and ejected towards the outlet.

[0009] In the above technical solution, when fluid enters the cavity from the inlet and is ejected towards the outlet, if it carries sparks, the sparks will be blocked by a baffle located inside the cavity along the fluid's ejection path. The baffle is located inside the cavity and along the path of the sparks carried by the fluid entering from the inlet towards the outlet. When a spark collides with the baffle, its inertia and velocity are impeded, changing its original ejection direction. The baffle effectively prevents the sparks from continuing to be ejected towards the outlet. The baffle can control the propagation range of the sparks within the cavity, thereby reducing the possibility of sparks being ejected towards the explosion-proof vent.

[0010] As an optional technical solution of this application, the explosion-proof part includes a bottom wall spaced apart from the main body and a side wall connecting the bottom wall and the main body. The bottom wall and the side wall together form a cavity. The cavity includes a first sub-cavity and a second sub-cavity surrounding the first sub-cavity. The first sub-cavity corresponds to the outlet. The bottom wall of the first sub-cavity is used to prevent fluid outside the first side of the main body from directly entering the cavity. The inlet is disposed on the bottom wall of the second sub-cavity.

[0011] In the above technical solution, the spark-carrying fluid is injected upwards from inside the energy storage device onto the bottom wall of the first sub-cavity. The fluid is then blocked by the bottom wall, preventing the spark from directly entering the cavity and reaching the outlet to ignite. This also reduces the fluid velocity and decreases the pressure on the end cap assembly. On the other hand, the inlet is located on the bottom wall of the second sub-cavity, allowing the fluid to enter the cavity through the inlet and then exit through the outlet, thus rupturing the explosion-proof valve and achieving pressure relief. Furthermore, after the spark enters the cavity through the inlet on the bottom wall of the second sub-cavity, it is blocked by the first side of the main body as it is injected upwards, thus reducing the probability of the spark and fluid both exiting the explosion-proof valve and igniting.

[0012] As an optional technical solution of this application, the explosion-proof part includes a bottom wall spaced apart from the main body and a side wall connecting the bottom wall and the main body. The bottom wall and the side wall together form a cavity. The cavity includes a first sub-cavity and a second sub-cavity surrounding the first sub-cavity. The first sub-cavity corresponds to the outlet. The bottom wall of the first sub-cavity is used to prevent fluid outside the first side of the main body from directly entering the cavity. The inlet is disposed on the side wall of the second sub-cavity.

[0013] In the above technical solution, the spark-carrying fluid is injected upwards from inside the energy storage device onto the bottom wall of the first sub-cavity. The fluid is then blocked by the bottom wall, preventing the spark from directly entering the cavity and reaching the outlet to ignite. This also reduces the fluid velocity and decreases the pressure on the end cap assembly. On the other hand, the inlet is located on the side wall of the second sub-cavity, allowing the fluid to enter the cavity through the inlet and then exit through the outlet, thus rupturing the explosion-proof valve and achieving pressure relief. Furthermore, the spark enters the cavity through the inlet located on the side wall of the second sub-cavity. Since the spark is primarily injected upwards, and the opening direction of the inlet on the side wall of the second sub-cavity is along the length of the end cap assembly, this process is particularly effective. Therefore, when the spark enters the cavity from the inlet, the spray direction changes from upward spray (the thickness direction of the end cap assembly) to the length direction of the end cap assembly. This not only slows down the speed of the spark spray, but also confines the spark within the cavity, for example, by being blocked by the side wall of the second sub-cavity or the first side of the main body, thereby reducing the spark overflow to the outlet and thus reducing the probability of the spark and gas rushing out of the explosion-proof valve together and igniting.

[0014] As an optional technical solution of this application, the explosion-proof part includes a bottom wall spaced apart from the main body and a side wall connecting the bottom wall and the main body. The bottom wall and the side wall together form a cavity. The cavity includes a first sub-cavity and a second sub-cavity surrounding the first sub-cavity. The first sub-cavity corresponds to the outlet. The bottom wall of the first sub-cavity is used to prevent fluid outside the first side of the main body from directly entering the cavity. The inlet is disposed on the bottom wall of the second sub-cavity and the side wall of the second sub-cavity.

[0015] In the above technical solution, the spark-carrying fluid is injected upwards from inside the energy storage device onto the bottom wall of the first sub-cavity. The fluid is then blocked by the bottom wall, preventing the spark from directly entering the cavity and reaching the outlet to ignite. This also reduces the fluid velocity and decreases the pressure on the end cap assembly. On the other hand, the inlet is located on the bottom wall and side wall of the second sub-cavity, allowing the fluid to enter the cavity from the inlet and then exit from the outlet, rupturing the explosion-proof valve to relieve pressure. When the spark enters the cavity from the inlet located on the bottom wall of the second sub-cavity, it is blocked by the first side of the main body in the upward injection direction, thus reducing the probability of the spark and gas igniting together from the explosion-proof valve. When the spark enters the cavity through the inlet located on the side wall of the second sub-cavity, the spark is mainly ejected upwards. Since the opening direction of the inlet located on the side wall of the second sub-cavity is along the length direction of the end cap assembly, the ejection direction changes. This not only slows down the speed of the spark ejection but also confines the spark within the cavity, for example, by being blocked by the side wall of the second sub-cavity or the first side of the main body. This reduces the probability of the spark and gas escaping from the explosion-proof valve together and igniting.

[0016] As an optional technical solution of this application, in the projection plane, the projection of the bottom wall of the first sub-cavity completely covers the projection of the outlet.

[0017] In the above technical solution, the projection of the bottom wall of the first sub-cavity completely covers the projection of the outlet, which can ensure that when the internal pressure of the energy storage device is high, the fluid and / or sparks can only enter the explosion-proof part from the inlet and flow out from the outlet to break through the explosion-proof valve to play a pressure relief role. This ensures that the sparks can be completely blocked from directly spraying upwards toward the explosion-proof hole and igniting the side reaction combustible gas flowing outwards after breaking through the explosion-proof valve, thus preventing the energy storage device from catching fire and ensuring the safe use of the energy storage device.

[0018] As an optional technical solution of this application, the blocking member is disposed in the second sub-cavity. The blocking member in the second sub-cavity is used to prevent sparks carried by the fluid entering from the inlet from being ejected into the first sub-cavity.

[0019] In the above technical solution, when fluid enters the second sub-cavity from the inlet and is injected into the first sub-cavity, if it carries sparks, the sparks will be blocked by a baffle located inside the second sub-cavity along the fluid's injection path. The baffle is located inside the second sub-cavity; when a spark collides with the baffle, its inertia and velocity are impeded, changing its original injection direction. The baffle effectively prevents the sparks from continuing to be injected into the first sub-cavity. The baffle can control part of the spark's propagation range within the second sub-cavity, thereby reducing the possibility of sparks being injected into the explosion-proof vent.

[0020] As an optional technical solution of this application, the blocking member is disposed within the first sub-cavity. The blocking member within the first sub-cavity is used to prevent sparks carried by the fluid from the second sub-cavity from being ejected toward the outlet.

[0021] In the above technical solution, when fluid enters the second sub-cavity from the inlet and is injected into the first sub-cavity, if it carries sparks, the sparks will be blocked by a baffle located inside the first sub-cavity along the fluid's injection path. The baffle is located inside the first sub-cavity; when a spark collides with the baffle, its inertia and velocity are impeded, changing its original injection direction. The baffle effectively prevents the sparks from continuing to be ejected towards the outlet. The baffle can control part of the spark's propagation range within the first sub-cavity, thereby reducing the possibility of sparks being ejected towards the explosion-proof vent.

[0022] As an optional technical solution of this application, the blocking member is disposed in both the second sub-cavity and the first sub-cavity. The blocking member in the second sub-cavity is used to prevent sparks carried by the fluid entering from the inlet from being ejected into the first sub-cavity. The blocking member in the first sub-cavity is used to prevent sparks carried by the fluid from the second sub-cavity from being ejected into the outlet.

[0023] In the above technical solution, when fluid enters the second and first sub-cavities from the inlet and is ejected towards the outlet, if it carries sparks, the sparks will be blocked by baffles located inside the second and first sub-cavities along the fluid's ejection path. These baffles, located inside the second and first sub-cavities, impede the spark's inertia and velocity when it collides with them, altering its original ejection direction. The baffles effectively prevent the sparks from continuing to propagate towards the outlet. By controlling the spark propagation range within the second and first sub-cavities, the baffles reduce the likelihood of sparks being ejected towards the explosion-proof orifice, thereby lowering the probability of sparks and gas igniting together from the explosion-proof valve.

[0024] As an optional technical solution of this application, the blocking member is disposed at the junction of the first sub-cavity and the second sub-cavity, and the blocking member at the junction is used to prevent the sparks carried by the fluid entering from the second sub-cavity from being ejected into the first sub-cavity.

[0025] In the above technical solution, when fluid enters the second sub-cavity from the inlet and is injected into the first sub-cavity, if it carries sparks, the sparks will be blocked by a blocking component located at the junction of the first and second sub-cavities along the fluid's injection path. When the spark collides with the blocking component, its inertia and velocity are impeded, changing its original injection direction. The blocking component effectively prevents sparks from being injected from the second sub-cavity into the first sub-cavity. The blocking component can control part of the spark's propagation range within the second sub-cavity, thereby reducing the possibility of sparks being injected into the explosion-proof hole.

[0026] As an optional technical solution of this application, the inlet is disposed in the second sub-cavity and penetrates the bottom wall of the second sub-cavity, one end of the blocking member is connected to the bottom wall, and the blocking member extends along the thickness direction of the lower plastic.

[0027] In the above technical solution, one end of the blocking member is connected to the bottom wall of the second sub-cavity, thus bringing it closer to the inlet that penetrates the bottom wall of the second sub-cavity. This allows it to promptly block sparks carried by the fluid after the fluid enters the second sub-cavity from the inlet. Furthermore, the blocking member extends along the thickness direction of the lower plastic layer, enabling it to effectively intercept and block sparks carried by the fluid as it enters the inlet. On the other hand, the blocking member is aligned with the flow direction of the fluid, maximizing its spark-blocking effect without obstructing fluid flowout. The blocking member forms an effective barrier inside the explosion-proof section, preventing the propagation and diffusion of sparks, thereby reducing the probability of sparks and gas igniting together when they escape from the explosion-proof valve.

[0028] As an optional technical solution of this application, the inlet is disposed in the second sub-cavity and penetrates the bottom wall of the second sub-cavity, one end of the blocking member is connected to the main body, and the blocking member extends along the thickness direction of the lower plastic.

[0029] In the above technical solution, one end of the blocking member is connected to the main body, and the blocking member extends along the thickness direction of the lower plastic, enabling it to effectively intercept and block sparks carried by the fluid when it enters the inlet. Furthermore, the blocking member is aligned with the fluid flow direction to maximize its spark-blocking effect without obstructing fluid flow. The blocking member forms an effective barrier inside the explosion-proof section, preventing the propagation and diffusion of sparks, thereby reducing the probability of sparks and gas igniting together from the explosion-proof valve.

[0030] As an optional technical solution of this application, the inlet is disposed in the second sub-cavity and penetrates the bottom wall of the second sub-cavity. One end of the blocking member is connected to the bottom wall, and the other end of the blocking member is connected to the main body. The blocking member extends along the thickness direction of the lower plastic.

[0031] In the above technical solution, one end of the blocking component is connected to the bottom wall, and the other end is connected to the main body, ensuring the stability and reliability of the blocking component. Furthermore, the blocking component extends along the thickness direction of the lower plastic, enabling it to effectively intercept and block sparks carried by the fluid as it enters the inlet. On the other hand, the blocking component is aligned with the fluid flow direction, maximizing its spark-blocking effect without obstructing fluid outflow. Through this design, the blocking component forms an effective barrier inside the explosion-proof section, preventing the propagation and diffusion of sparks, thereby reducing the probability of sparks and gas igniting together from the explosion-proof valve.

[0032] As an optional technical solution of this application, the inlet is disposed in the second sub-cavity and penetrates the bottom wall of the second sub-cavity, at least one end of the blocking member is connected to the side wall, and the blocking member extends along the length direction of the lower plastic.

[0033] In the above technical solution, the inlet penetrates the bottom wall of the second sub-cavity, allowing it to directly connect to the cavity and thus enabling fluid to flow smoothly into the cavity from the inlet. The cavity is also connected to the outlet, so the fluid can flow out to the explosion-proof hole after entering the cavity. On the other hand, the blocking member extends along the length of the lower plastic, ensuring that its position does not affect the fluid flow and preventing sparks carried in the fluid from entering the cavity at the inlet, thereby reducing the probability of sparks and gas igniting together from the explosion-proof valve.

[0034] As an optional technical solution of this application, the inlet includes multiple inlets, which are distributed in a first array on the bottom wall and / or side wall of the second sub-cavity. The blocking member includes multiple members. Each blocking member is one of a columnar structure, sheet structure, strip structure, and block structure with a single extending direction. The multiple blocking members are distributed in a second array within the cavity. In the projection plane, the projection rows and columns of the first array and the second array intersect.

[0035] In the above technical solution, multiple inlets are distributed in a first array, which increases the number of channels for fluid to enter the cavity and improves the efficiency of fluid entry and exit. The blocking components are arranged in a second array. In the projection plane, the projection rows and columns of the first array and the second array are staggered. This staggered distribution helps to increase the coverage of the blocking components, which can confine sparks within the cavity, thereby reducing the probability of sparks and gas rushing out of the explosion-proof valve together and causing a fire.

[0036] As an optional technical solution of this application, the inlet includes multiple inlets, which are distributed in a first array on the bottom wall and / or side wall of the second sub-cavity. The blocking member includes at least two members, each of which is a bent structure with multiple extending directions. In the projection plane, the projections of at least two blocking members form a maze channel, and the projection of the inlet is located within the maze channel.

[0037] In the above technical solution, the larger number and denser distribution of the inlets in the first array enable more effective guidance of fluid into the cavity. The multiple bending structures extending in multiple directions increase the extension directions of the obstruction components in three-dimensional space, forming a maze-like structure. These obstruction components lengthen the fluid channel, increasing the difficulty for sparks to reach the outlet, further enhancing the safety of the energy storage device.

[0038] As an optional technical solution of this application, the inlet includes multiple inlets, which are distributed in a first array on the bottom wall and / or side wall of the second sub-cavity. The blocking member includes one member, which is a bent structure with multiple extending directions. In the projection plane, the projection of the blocking member forms a maze channel, and the projection of the inlet is located within the maze channel.

[0039] In the above technical solution, the blocking component forms a labyrinth channel. The projection of the inlet is located inside the labyrinth channel, causing the fluid to enter the labyrinth channel when it flows through the inlet. The fluid is interfered with and restricted by the blocking component, resulting in a complex flow path, increasing the path length and resistance of the fluid, which helps to improve the control and regulation effect of the fluid. On the other hand, the blocking component can prevent sparks from being ejected in the length and width directions of the end cap assembly, while the first side of the body can prevent sparks from being ejected in the thickness direction of the end cap assembly. Therefore, the blocking component combined with the body can better confine sparks in the cavity, thereby reducing the probability of sparks and gas rushing out of the explosion-proof valve together and causing an fire.

[0040] As an optional technical solution of this application, the second sub-cavity includes two sub-cavities. In the width direction of the lower plastic, the two second sub-cavities are distributed on opposite sides of the first sub-cavity. In the length direction of the lower plastic, the explosion-proof part includes a first sidewall and a second sidewall spaced apart from each other. Both the first sidewall and the second sidewall are closed structures and are used to prevent fluid from flowing into the cavity from the first sidewall and the second sidewall.

[0041] In the above technical solution, the two second sub-cavities are located on opposite sides of the first sub-cavity, which increases the cavity volume, allowing the cavity to accept fluid from multiple directions, improving fluid flow within the cavity, reducing fluid resistance, and thus ensuring normal pressure relief when the internal pressure of the energy storage device is too high. Simultaneously, because the second sub-cavities are located on both sides of the first sub-cavity, the explosion-proof structure is more compact, facilitating the integral molding of the explosion-proof section, simplifying mold design and molding operations during manufacturing, improving production efficiency, and reducing production costs. Furthermore, the first and second sidewalls adopt a closed structure, preventing fluid from entering the cavity through the first and second sidewalls, thus preventing fluid carrying sparks from entering the cavity through the first and second sidewalls. This balances normal fluid pressure relief and minimizes the entry of sparks into the cavity, improving the safety performance of the energy storage device.

[0042] As an optional technical solution of this application, the second sub-cavity includes two sub-cavities. In the width direction of the lower plastic, the two second sub-cavities are distributed on opposite sides of the first sub-cavity. In the length direction of the lower plastic, the explosion-proof portion includes a first sidewall and a second sidewall spaced apart from each other. At least one of the first sidewall and the second sidewall is provided with a notch, and the notch communicates with the cavity.

[0043] In the above technical solution, when the internal pressure of the energy storage device is very high, the fluid needs to quickly break through the explosion-proof valve to relieve pressure. At least one of the first and second side walls has a notch connected to the cavity. This notch acts as an inlet, providing a new path for the fluid to enter the cavity. This facilitates the fluid's smooth entry into the cavity and its ability to break through the explosion-proof valve, preventing the accumulated pressure inside the energy storage device from causing safety issues. Simultaneously, the notch is located on at least one of the first and second side walls, ensuring that the gas flow direction is not directly upwards when entering the cavity. This prevents sparks carried by the fluid from directly entering the cavity and reacting with the side reaction gas that breaks through the explosion-proof valve, thus avoiding ignition. In other words, the notch allows the fluid to enter the cavity and break through the explosion-proof valve for pressure relief while preventing sparks from being ejected towards the explosion-proof port and causing a fire.

[0044] As an optional technical solution of this application, the lower plastic includes a first insulating member and a second insulating member. The explosion-proof part protrudes from the body portion of the second insulating member in a direction away from the end cap. The body portion of the first insulating member is connected to the body portion of the second insulating member to form the cavity.

[0045] In the above technical solution, the lower plastic part is a separate component. The first insulating component and the second insulating component can be molded separately and then assembled together to form a cavity, which simplifies the molding process. Furthermore, the first insulating component can be positioned on the first surface of the end cap under the limiting effect of the second insulating component. The second insulating component can also be positioned on the first surface of the end cap under the limiting effect of the first insulating component, thereby improving the stability and portability of the installation of the first and second insulating components and facilitating the disassembly of the lower plastic part.

[0046] Secondly, this application provides an energy storage device, which includes an end cap assembly of any of the above-mentioned technical solutions.

[0047] In the energy storage device described above, when a partial short circuit occurs inside the device, the ejected fluid may carry sparks. The staggered inlet and outlet design prevents sparks from being directly ejected from the inlet to the outlet. Since the outlet is aligned with the explosion-proof valve, sparks also do not exit the valve directly. Instead, when the spark reaches the inlet of the lower plastic section, the projections of the inlet and outlet do not coincide, resulting in a misalignment. Therefore, after the fluid carrying the spark enters the inlet, its path is deflected within the cavity, preventing it from directly exiting the outlet and spraying upwards towards the explosion-proof port. This avoids igniting fluid that might otherwise directly eject from the outlet and breach the explosion-proof valve. Therefore, the end cap assembly effectively prevents sparks from also directly spraying upwards towards the explosion-proof port, avoiding ignition of flammable side reaction gases or other fluids flowing outwards after breaching the explosion-proof valve, thus ensuring the safety of the energy storage device.

[0048] Thirdly, this application provides an electrical device that includes the energy storage device described in the second aspect, the energy storage device providing electrical energy to the electrical device.

[0049] In the electrical equipment described above, when a partial short circuit occurs inside the energy storage device, the ejected fluid may carry sparks. The staggered inlet and outlet design prevents sparks from being directly ejected from the inlet to the outlet. Since the outlet is aligned with the explosion-proof valve, sparks also do not directly exit the valve. Instead, when the spark reaches the inlet of the lower plastic section, the projections of the inlet and outlet do not coincide, resulting in a misalignment. Therefore, after the fluid carrying the spark enters the inlet, its path is deflected within the cavity, preventing it from directly exiting the outlet and spraying upwards towards the explosion-proof port. This avoids igniting fluid that would otherwise directly exit the outlet and breach the explosion-proof valve. Therefore, the end cap assembly effectively prevents sparks from also directly spraying upwards towards the explosion-proof port, avoiding ignition of byproduct flammable gases or other fluids flowing outwards after breaching the explosion-proof valve, thus ensuring the safety of the energy storage device.

[0050] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0051] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. 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: Figure 1 This is a perspective view of an end cap assembly according to some embodiments of this application; Figure 2 for Figure 1 An exploded view of the end cap assembly shown; Figure 3 for Figure 1 A three-dimensional schematic diagram of the end cap assembly from another perspective; Figure 4 for Figure 1 The diagram shows the positional relationship between the explosion-proof valve and the outlet of the end cap assembly in the third direction Z. Figure 5 for Figure 1 The diagram shows the positional relationship between the explosion-proof valve and the outlet of the end cap assembly in the first direction X. Figure 6 for Figure 1 Top view of the end cap assembly shown; Figure 7 for Figure 6 The end cap assembly shown is a cross-sectional view taken by line VII-VII; Figure 8 for Figure 6 A schematic cross-sectional view of the end cap assembly shown, taken by line VII-VIII; Figure 9 for Figure 1 The diagram shown illustrates the first blocking element in the end cap assembly. Figure 10 This is a schematic diagram of the end cap assembly in some embodiments of this application when the blocking member is a second blocking member; Figure 11 This is a schematic diagram of the end cap assembly in some embodiments of this application when the blocking member is a third blocking member; Figure 12 A perspective view of the end cap assembly in some other embodiments after removing the end cap and the explosion-proof valve; Figure 13This is a schematic diagram of an energy storage device that is a single battery cell in some embodiments of this application; Figure 14 for Figure 13 The diagram shown is an exploded view of the energy storage device. Figure 15 This is a schematic diagram of an energy storage device that is a battery pack in some embodiments of this application; Figure 16 This is a schematic diagram of the planar structure of an electrical device according to some embodiments of this application.

[0052] The reference numerals in the detailed embodiments are as follows: 10,000 vehicles; Energy storage device 1000, controller 2000, motor 3000; End cap assembly 100, electrode assembly 200, housing 300, box 500, first part 501, second part 503; End cap 10, first surface 11 of end cap, second surface 13 of end cap, explosion-proof hole 15, first mounting hole 17, side wall 171 of first mounting hole; explosion-proof valve 30, protective plate 40; Lower plastic 50, cavity 51, first insulating component 52, inlet 53, second insulating component 54, outlet 55, second mounting hole 56, main body 57, first side of main body 571, second side of main body 572, explosion-proof part 58, bottom wall of explosion-proof part 581, side wall of explosion-proof part 583, first sub-cavity 5851, bottom wall of first sub-cavity 58511, side wall of first sub-cavity 58513, second sub-cavity 5853, bottom wall of second sub-cavity 58531, side wall of second sub-cavity 58533, first side wall 58534, second side wall 58535, notch 58537, blocking component 59, first blocking component 591, second blocking component 593, third blocking component 595; Upper plastic part 60, pole 70, flange part 71, column part 73, sealing ring 80; First direction X, second direction Y, third direction Z. Detailed Implementation

[0053] 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.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0055] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0056] In this document, the term "implementation" means that a specific feature, structure, or characteristic described in connection with an implementation may be included in at least one implementation of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same implementation, nor is it a separate or alternative implementation mutually exclusive with other implementations. It will be explicitly and implicitly understood by those skilled in the art that the implementations described herein can be combined with other implementations.

[0057] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0058] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0059] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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.

[0060] In the description of the embodiments of this application, unless otherwise explicitly specified and limited, the technical terms such as "installation", "connection", "linking", and "fixing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components.

[0061] Firstly, please refer to Figure 1 This application provides an end cap assembly 100. Please refer to... Figure 2 The end cap assembly 100 includes an end cap 10, an explosion-proof valve 30, and a lower plastic part 50. The end cap 10 includes a first surface 11 and a second surface 13 facing away from each other. The end cap 10 has an explosion-proof hole 15 penetrating through the first surface 11 and the second surface 13. The explosion-proof valve 30 is installed on the end cap 10 and closes the explosion-proof hole 15. The lower plastic part 50 is disposed on the side where the first surface 11 of the end cap is located. The lower plastic part 50 includes a body portion 57 and an explosion-proof part 58. The body portion 57 includes a first side 571 and a second side 572. The second side 572 of the body portion faces the first surface 11 of the end cap, and the body portion 57 has an outlet 55 penetrating through the first side 571 and the second side 572. The explosion-proof part 58 protrudes from the first side 571 in a direction away from the end cap 10. The explosion-proof part 58 and the body portion 57 together form a cavity 51, and the side of the explosion-proof part 58 facing away from the body portion 57 has an inlet 53. The cavity 51 is connected to both the inlet 53 and the outlet 55. The inlet 53 is used to allow fluid to flow into the cavity 51. The outlet 55 is aligned with the explosion-proof valve 30 and is used to allow fluid to flow from the cavity 51 to the explosion-proof hole 15. In the projection plane of the thickness direction (first direction X) of the plastic 50 perpendicular to the bottom, the projection of the inlet 53 and the projection of the outlet 55 are offset. A rectangular coordinate system is established with the length, width, and height (thickness) of the end cap assembly 100 as the three axes. In some embodiments, the first direction X is the length direction of the end cap assembly 100, the second direction Y is the width direction of the end cap assembly 100, and the third direction Z is the height direction (thickness direction) of the end cap assembly 100.

[0062] Specifically, please refer to Figure 1 and Figure 2 In some embodiments of this application, in Figure 1From the perspective of [reference needed], the first surface 11 of the end cap is the lower surface of the end cap 10. The second surface 13 of the end cap is the upper surface of the end cap 10. The end cap 10 is made of a conductive material, including aluminum, iron, copper, aluminum alloy, or iron alloy, etc. In this application, the end cap 10 is a plain aluminum sheet. The end cap 10 is provided with an explosion-proof hole 15 penetrating through the first surface 11 and the second surface 13 of the end cap. The explosion-proof valve 30 is installed at the explosion-proof hole 15 of the end cap 10 and seals the explosion-proof hole 15. In some embodiments, a protective plate 40 may be provided above the explosion-proof valve 30. The protective plate 40 is used to prevent dust from covering the explosion-proof valve 30 and also to prevent the explosion-proof valve 30 from being cut open by a sharp object.

[0063] Specifically, please refer to Figure 2 and Figure 3 In some embodiments of this application, using Figure 2 From this perspective, the first side 571 of the body portion is the lower surface of the body portion 57, and the second side 572 of the body portion is the upper surface of the body portion 57. The second side 572 of the body portion faces the first surface 11 of the end cap. Please refer to... Figure 2 , Figure 4 and Figure 5 In some embodiments of this application, the outlet 55 penetrates the second side 572 and the first side 571 of the body portion, and is located directly below the explosion-proof valve 30 in the thickness direction Z. The body portion 57 can be at least one of the following: plate-shaped, strip-shaped, block-shaped, or irregularly shaped.

[0064] Specifically, please refer to Figure 2 and Figure 3 In some embodiments of this application, the explosion-proof part 58 is disposed on the first side 571 of the body portion and forms a cavity 51 together with the first side 571 of the body portion. The cavity 51 is located directly below the explosion-proof valve 30 in the thickness direction (third direction Z) of the lower plastic 50. The explosion-proof part 58 extends from the first side 571 of the body portion in a direction away from the end cap 10. The explosion-proof part 58 and the body portion 57 can be detachably connected or non-detachably connected. Detachable connections include, but are not limited to, screw connections, snap-fit ​​connections, or a combination of screw connections and snap-fit ​​connections. Non-detachable connections include, but are not limited to, glue connections, welding, integral molding, or a combination of glue connections and welding connections.

[0065] For details, please continue reading Figure 1 and Figure 2In some embodiments of this application, outlet 55 is aligned with explosion-proof valve 30, that is, outlet 55 is located directly below explosion-proof valve 30 or maintains a certain alignment with the opening of explosion-proof valve 30, and is used to allow fluid to flow from cavity 51 to explosion-proof hole 15. In the projection plane of the thickness direction of plastic 50, the projection of inlet 53 and the projection of outlet 55 are offset, meaning that on the projection plane (XY plane) of end cap assembly 100 in the third direction Z, the projection positions of inlet 53 and outlet 55 do not coincide, and there is a certain horizontal offset between them. In this embodiment, the fluid includes the side reaction combustible gas generated inside energy storage device 1000, and the electrolyte inside energy storage device 1000.

[0066] For details, please refer to Figure 1 and Figure 2 In some embodiments of this application, the end cap 10 also has a first mounting hole 17 penetrating the first surface 11 and the second surface 13 of the end cap. The lower plastic 50 has a second mounting hole 56 penetrating the first side 571 and the first side 572 of the body portion. The end cap assembly 100 also includes an upper plastic 60, a pole post 70, and a sealing ring 80. The pole post 70 includes a flange portion 71 and a column portion 73. The flange portion 71 is connected to one end of the column portion 73, and the column portion 73 passes through the first mounting hole 17 and the second mounting hole 56. Please refer to... Figure 8 A sealing ring 80 is sleeved on the outside of the cylindrical portion 73 and is located between the lower plastic 50 and the cylindrical portion 73 in the first direction X. The sealing ring 80 is used to seal the gap between the lower plastic 50 and the cylindrical portion 73 to prevent electrolyte from leaking out of the energy storage device 100 from the first mounting hole 17 and the second mounting hole 56. Understandably, in this embodiment, the electrode post 70 includes a positive electrode post (e.g., Figure 1 The left terminal (70) and the negative terminal (e.g.) Figure 1The right electrode post 70 and the column portions 73 of both the positive and negative electrode posts are fitted with sealing rings 80. The sealing rings 80 seal the electrode post 70 and the lower plastic 50, thus preventing electrolyte leakage. In the above technical solution, when a partial short circuit occurs inside the energy storage device 1000, the ejected fluid may carry sparks. The staggered design of the inlet 53 and outlet 55 prevents sparks from being ejected directly from the inlet to the outlet as in traditional solutions. Instead, when the spark reaches the inlet 53 of the lower plastic 50, because the projections of the inlet 53 and the outlet 55 do not coincide, there is a certain horizontal offset between them. Therefore, after the fluid carrying the spark enters the inlet 53, its path is deflected inside the cavity 51, preventing it from directly rushing out of the outlet 55 and spraying upwards towards the explosion-proof hole 15. This avoids the safety hazard of the fluid carrying the spark directly rushing out of the outlet and breaking through the explosion-proof valve, igniting the fluid (side reaction combustible gas), and causing the energy storage device 1000 to catch fire, as is possible in traditional solutions. Therefore, the end cap assembly 100 can effectively isolate the fluid from the sparks it carries, preventing the sparks from being sprayed directly upwards toward the explosion-proof hole 15, avoiding ignition of the side reaction combustible gases and other fluids that flow outwards through the explosion-proof valve 30, and ensuring the safety of the energy storage device 1000.

[0067] Furthermore, the main body 57 includes a first side 571 and a second side 572. The first side 571 faces the interior of the energy storage device 1000, while the second side 572 faces the exterior of the energy storage device 1000. This allows the main body 57 to effectively isolate the energy storage device 1000 from its internal and external environments and ensures that the interior of the energy storage device 1000 is protected from external interference. In addition, the main body 57 is provided with an outlet 55 that penetrates both the first side 571 and the second side 572, allowing fluids (such as electrolyte or gas) inside the energy storage device 1000 to flow out smoothly and to break through the explosion-proof valve 30 to flow to the exterior of the energy storage device 1000, thereby achieving a pressure relief effect. Furthermore, the explosion-proof section 58 is located on the first side 571 of the main body and together with the first side 571 of the main body, forms a cavity 51. The explosion-proof section 58 can buffer the fluid that breaks through the explosion-proof valve 30, while the cavity 51 allows the fluid to be ejected towards the explosion-proof valve 30 and break through it to achieve pressure relief. An inlet 53 is provided on the explosion-proof section 58 to introduce internal fluid into the cavity 51 to maintain the balance of the internal environment of the energy storage device 1000.

[0068] Please see Figures 7 to 12 As an optional technical solution of this application, the lower plastic 50 may also include a blocking member 59. The blocking member 59 is disposed in the cavity 51 and is located on the path of the spark carried by the fluid entering from the inlet 53 being sprayed toward the outlet 55.

[0069] Specifically, the blocking member 59 is used to prevent sparks carried by the fluid entering from the inlet 53 from being ejected towards the outlet 55. The blocking member 59 can be disposed in the first sub-cavity 5851, the second sub-cavity 5853, or both. The shape of the blocking member 59 is not limited, and it can be one or more of the following: columnar structure, sheet structure, strip structure, and block structure.

[0070] In the above technical solution, when fluid enters cavity 51 from inlet 53 and is ejected towards outlet 55, if it carries sparks, the sparks will be blocked by a baffle 59 located inside cavity 51 along the fluid ejection path. The baffle 59 is located inside cavity 51; when a spark collides with the baffle 59, its inertia and velocity are impeded, changing its original ejection direction. The baffle 59 effectively prevents the spark from continuing to be ejected towards outlet 55. The baffle 59 can control the propagation range of the spark within cavity 51, thereby reducing the possibility of the spark being ejected towards explosion-proof hole 15.

[0071] As an optional technical solution of this application, the explosion-proof part 58 includes a bottom wall 581 spaced apart from the main body part 57 and a side wall 583 connecting the bottom wall 581 and the main body part 57. The bottom wall 581 and the side wall 583 of the explosion-proof part together form a cavity 51. The cavity 51 includes a first sub-cavity 5851 and a second sub-cavity 5853 surrounding the first sub-cavity 5851. The first sub-cavity 5851 corresponds to the outlet 55. The bottom wall 58511 of the first sub-cavity is used to prevent fluid outside the first side 571 of the main body part from directly entering the cavity 51. The inlet 53 is disposed on the bottom wall 58531 of the second sub-cavity.

[0072] Specifically, please refer to Figure 2 and Figure 3In some embodiments of this application, the explosion-proof part 58 is located on the first side 571 of the body part and includes a bottom wall 581 and a side wall 583. The bottom wall 581 of the explosion-proof part and the first side 571 of the body part are spaced apart and face each other, forming a cavity 51 together. The bottom wall 581 of the explosion-proof part is connected to the side wall 583 of the explosion-proof part at least at both ends in the first direction X, and the side wall 583 of the explosion-proof part is connected between the bottom wall 581 of the explosion-proof part and the body part 57. In other embodiments of this application, the bottom wall 581 of the explosion-proof part is connected to the side wall 583 of the explosion-proof part not only at both ends in the first direction X, but also at both ends in the second direction Y. The cavity 51 is a spatial structure formed by the bottom wall 581 and the side wall 583 of the explosion-proof part. The cavity 51 includes a first sub-cavity 5851 and a second sub-cavity 5853 surrounding the first sub-cavity 5851. On the third direction Z, the first sub-cavity 5851 is located directly below the explosion-proof valve 30, and the outlet 55 corresponds to the first sub-cavity 5851, with both outlet 55 and the first sub-cavity 5851 located directly below the explosion-proof valve 30. The second sub-cavity 5853 is located around the first sub-cavity 5851 and extends along the outer edge of the first sub-cavity 5851 in a direction away from the center of the first sub-cavity 5851. The specific orientation of the second sub-cavity 5853 is not limited. The inlet 53 is located on the bottom wall 58531 of the second sub-cavity.

[0073] In the above technical solution, the fluid carrying the spark is injected upward from inside the energy storage device 1000 onto the bottom wall 58511 of the first sub-cavity. It is then blocked by the bottom wall 58511, preventing the spark from directly entering the cavity 51 and reaching the outlet 55 to ignite. Simultaneously, it reduces the fluid velocity and decreases the pressure on the end cap assembly 100. On the other hand, the inlet 53, located on the bottom wall 58531 of the second sub-cavity, allows the fluid to enter the cavity 51 through the inlet 53 and then flow out through the outlet 55, breaking through the explosion-proof valve 30 to achieve pressure relief. Furthermore, after the spark enters the cavity 51 through the inlet 53 located on the bottom wall 58531 of the second sub-cavity, it is blocked by the first side 571 of the main body in the upward injection direction (third direction Z), thus reducing the probability of the spark igniting from the explosion-proof valve 30.

[0074] As an optional technical solution of this application, the inlet 53 can also be set on the side wall 58533 of the second sub-cavity.

[0075] In the above technical solution, the fluid carrying the spark is injected upwards from inside the energy storage device 1000 onto the bottom wall 58511 of the first sub-cavity. It is then blocked by the bottom wall 58511, preventing the spark from directly entering the cavity 51 and reaching the outlet 55 to ignite. Simultaneously, it reduces the fluid flow rate and decreases the pressure on the end cap assembly 100. On the other hand, the inlet 53 is located on the side wall 58533 of the second sub-cavity, allowing the fluid to enter the cavity 51 from the inlet 53 and then flow out from the outlet 55, breaking through the explosion-proof valve 30 to achieve pressure relief. Furthermore, the spark enters the cavity 51 from the inlet 53 located on the side wall 58533 of the second sub-cavity. Since the spark is mainly injected upwards (third direction Z), and the opening direction of the inlet 53 located on the side wall 58533 is the first direction X. Therefore, when the spark enters the cavity 51 from the inlet 53, the spray direction changes from the third direction Z to the first direction X. This not only slows down the speed of the spark spray, but also confines the spark within the cavity 51, for example, by being blocked by the side wall 58533 of the second sub-cavity or the first side 571 of the main body. This reduces the chance of the spark overflowing to the outlet 55, thereby reducing the probability of the spark and gas rushing out of the explosion-proof valve 30 together and igniting.

[0076] As an optional technical solution of this application, the inlet 53 can also be simultaneously disposed on the bottom wall 58531 of the second sub-cavity and the side wall 58533 of the second sub-cavity.

[0077] In the above technical solution, the spark-carrying fluid is injected upwards from inside the energy storage device 1000 onto the bottom wall 58511 of the first sub-cavity. The fluid is then blocked by the bottom wall 58511, preventing the spark from directly entering the cavity 51 and reaching the outlet 55 to ignite. Simultaneously, the fluid flow rate is reduced, decreasing the pressure on the end cap assembly 100. On the other hand, the inlet 53 is located on the bottom wall 58531 and the side wall 58533 of the second sub-cavity, allowing the fluid to enter the cavity 51 from the inlet 53 and then flow out from the outlet 55, rupturing the explosion-proof valve 30 to achieve pressure relief. When a spark enters the cavity 51 through the inlet 53 located on the bottom wall 58531 of the second sub-cavity, it is blocked in the upward jet direction (third direction Z) by the first side 571 of the main body. This reduces the probability of the spark and gas igniting together from the explosion-proof valve 30. When the spark enters the cavity 51 through the inlet 53 located on the side wall 58533 of the second sub-cavity, the spark is mainly jetted upward (third direction Z), while the opening direction of the inlet 53 is the first direction X. Therefore, when the spark enters the cavity 51 through the inlet 53, the jetting direction changes from the third direction Z to the first direction X. This not only slows down the spark jetting speed but also confines the spark within the cavity 51, for example, by being blocked by the side wall 58533 of the second sub-cavity and the first side 571 of the main body, thereby reducing the probability of the spark and gas igniting together from the explosion-proof valve 30.

[0078] As an optional technical solution of this application, in the projection plane XY, the projection of the bottom wall 58511 of the first sub-cavity completely covers the projection of the explosion-proof valve 30. For example... Figure 4 As shown, in the first direction X, the outer contour of the explosion-proof valve 30 is within the range covered by the outer contour of the bottom wall 58511 of the first sub-cavity; as Figure 5 As shown, in the second direction Y, the outer contour of the explosion-proof valve 30 is also within the range covered by the outer contour of the bottom wall 58511 of the first sub-cavity. Thus, when the spark-carrying fluid is injected upward from inside the energy storage device 1000 to the bottom wall 58511 of the first sub-cavity, it is blocked by the bottom wall 58511 of the first sub-cavity, preventing the spark from directly entering the cavity 51 and reaching the outlet 55, thereby rupturing the explosion-proof valve 30 and causing a fire.

[0079] As an optional technical solution of this application, in the projection plane XY, the projection of the bottom wall 58511 of the first sub-cavity completely covers the projection of the outlet 55.

[0080] In the above technical solution, the projection of the bottom wall 58511 of the first sub-cavity completely covers the projection of the outlet 55, which can ensure that when the internal pressure of the energy storage device 1000 is high, the fluid and / or sparks can only enter the explosion-proof part 58 from the inlet 53 and flow out from the outlet 55 to break through the explosion-proof valve 30 to play a pressure relief role. This ensures that the sparks can be completely blocked from directly spraying upwards toward the explosion-proof hole 15 and igniting the side reaction combustible gas flowing outwards after breaking through the explosion-proof valve 30, thus preventing the energy storage device 1000 from catching fire and ensuring the safe use of the energy storage device 1000.

[0081] Of course, it is understandable that the projection of the bottom wall 58511 of the first sub-cavity in the projection plane XY may not completely cover the projection of the outlet 55, as long as the projection of the bottom wall 58511 of the first sub-cavity in the projection plane XY completely covers the projection of the explosion-proof valve 30.

[0082] Cavity 51 Cavity 51 Cavity 51 Cavity 51 Please refer to Figure 7 and Figure 8 As an optional technical solution of this application, the blocking member 59 is disposed in the second sub-cavity 5853. The blocking member 59 in the second sub-cavity 5853 is used to prevent the sparks carried by the fluid entering from the inlet 53 from being ejected into the first sub-cavity 5851.

[0083] For details, please continue reading Figure 7 and Figure 8In some embodiments of this application, a blocking member 59 is disposed within the second sub-cavity 5853 to prevent sparks carried by the fluid entering from the inlet 53 from being ejected into the first sub-cavity 5851. The shape of the blocking member 59 is not limited; it can be one or more of the following: a columnar structure, a sheet-like structure, a strip-like structure, and a block-like structure, or other structures that can meet the blocking requirements. In this application, the first blocking member 591 is a columnar structure. The number of blocking members 59 is not limited; it can be one or more (two or more).

[0084] In the above technical solution, when fluid enters the second sub-cavity 5853 from the inlet 53 and is sprayed towards the first sub-cavity 5851, if it carries sparks, the sparks will be blocked by the blocking member 59 located inside the second sub-cavity 5853 immediately after entering the inlet. Furthermore, a first side 571 of the main body portion in the third direction Z of the second sub-cavity 5853 is also provided along the spark's path. Therefore, both the blocking member 59 inside the second sub-cavity 5853 and the first side 571 of the main body portion will control part of the spark's propagation range within the second sub-cavity 5853, preventing the spark from continuing to spray towards the first sub-cavity 5851, thereby reducing the possibility of the spark spraying towards the explosion-proof hole 15.

[0085] As an optional technical solution of this application, the blocking member 59 is disposed in the first sub-cavity 5851. The blocking member 59 in the first sub-cavity 5851 is used to prevent the sparks carried by the fluid from the second sub-cavity 5853 from being ejected toward the outlet 55.

[0086] Specifically, a blocking element 59 is disposed within the first sub-cavity 5851. The blocking element 59 is used to prevent sparks carried by the fluid from the second sub-cavity 5853 from being ejected towards the outlet 55. The shape of the blocking element 59 is not limited; it can be one or more of the following: columnar structure, sheet structure, strip structure, and block structure, or other structures that can meet the blocking requirements. The number of blocking elements 59 is not limited; there can be one or more.

[0087] In the above technical solution, when the fluid enters the second sub-cavity 5853 from the inlet 53, if it carries sparks, it will be blocked by the bottom wall 58531, the side wall 58533, and the first side 571 of the body portion in the third direction Z of the second sub-cavity 5853. The blocking member 59 is located inside the first sub-cavity 5851. When a spark that is not blocked in the second sub-cavity 5853 collides with the blocking member 59, the spark's inertia and velocity will be blocked, changing its original jet direction. The blocking member 59 can prevent sparks ejected from the second sub-cavity 5853 from continuing to jettison towards the outlet 55. The blocking member 59 can control the propagation range of some sparks within the first sub-cavity 5851, thereby reducing the possibility of sparks jetting towards the explosion-proof hole 15.

[0088] As an optional technical solution of this application, the blocking member 59 is simultaneously disposed in the second sub-cavity 5853 and the first sub-cavity 5851. The blocking member 59 in the second sub-cavity 5853 is used to prevent the sparks carried by the fluid entering from the inlet 53 from being ejected into the second sub-cavity 5853. The blocking member 59 in the first sub-cavity 5851 is used to prevent the sparks carried by the fluid from the second sub-cavity 5853 from being ejected into the outlet 55.

[0089] Specifically, the blocking element 59 is disposed within the second sub-cavity 5853 and the first sub-cavity 5851. The blocking element 59 in the second sub-cavity 5853 prevents sparks carried by the fluid entering from the inlet 53 from being ejected into the second sub-cavity 5853. The blocking element 59 in the first sub-cavity 5851 prevents sparks carried by the fluid from the second sub-cavity 5853 from being ejected into the outlet 55. The shape of the blocking element 59 is not fixed; it can be one or more of the following: columnar structure, sheet structure, strip structure, and block structure, or other structures that meet the blocking requirements. The number of blocking elements 59 is not fixed; it can be one or more.

[0090] In the above technical solution, when the fluid enters the second sub-cavity 5853 from the inlet 53, if it carries a spark, its inertia and velocity will be blocked for the first time by the blocking member 59 installed in the second sub-cavity 5853, and its original jet direction will be changed. Sparks not blocked by the blocking member 59 in the second sub-cavity 5853 will be blocked a second time by the blocking member 59 inside the first sub-cavity 5851 after being jetted into it. Therefore, by the first and second blocking of the second sub-cavity 5853 and the first sub-cavity 5851, the blocking member 59 can control the propagation range of some sparks within the second sub-cavity 5853 and the first sub-cavity 5851, thereby further reducing the possibility of sparks jetting towards the explosion-proof hole 15, and further reducing the probability of sparks and gas igniting together from the explosion-proof valve.

[0091] As an optional technical solution of this application, the blocking member 59 is disposed at the junction of the first sub-cavity 5851 and the second sub-cavity 5853. The blocking member 59 at the junction is used to block the sparks carried by the fluid entering from the inlet 53 from being ejected into the first sub-cavity 5851.

[0092] Specifically, the blocking element 59 is disposed at the junction of the second sub-cavity 5853 and the first sub-cavity 5851. The blocking element 59 at the junction is used to prevent sparks carried by the fluid entering the second sub-cavity 5853 from being ejected into the first sub-cavity 5853 from the first sub-cavity 5853. The shape of the blocking element 59 is not limited; it can be one or more of the following: columnar structure, sheet structure, strip structure, and block structure, or other structures that can meet the blocking requirements. The number of blocking elements 59 is also not limited; there can be one or more.

[0093] In the above technical solution, when fluid enters the second sub-cavity 5853 from the inlet 53 and is sprayed towards the first sub-cavity 5851, if it carries sparks, the sparks will be blocked by the blocking member 59 located at the junction of the first sub-cavity 5851 and the second sub-cavity 5853 along the fluid's spray path. When the spark collides with the blocking member 59, its inertia and velocity are blocked, changing its original spray direction. The blocking member 59 effectively prevents sparks from being sprayed from the second sub-cavity 5853 towards the first sub-cavity 5851. The blocking member 59 can control part of the spark's propagation range inside the second sub-cavity 5853, thereby reducing the possibility of sparks being sprayed towards the explosion-proof hole 15.

[0094] As an optional technical solution of this application, the inlet 53 is disposed in the second sub-cavity 5853 and penetrates the bottom wall 58531 of the second sub-cavity. One end of the blocking member 59 is connected to the bottom wall 58531 of the second sub-cavity, and the blocking member 59 extends along the thickness direction of the lower plastic 50.

[0095] Specifically, please refer to Figure 2 and Figure 3 In some embodiments of this application, the inlet 53 is disposed inside the second sub-cavity 5853 and penetrates the bottom wall 58531 of the second sub-cavity. The inlet 53 communicates with the cavity 51. One end of the blocking member 59 is connected to the bottom wall 58531 of the second sub-cavity. The blocking member 59 extends along the thickness direction of the lower plastic 50, that is, extends along the third direction Z, and is consistent with the main flow direction of the inlet 53, that is, consistent with the flow direction of the fluid.

[0096] In the above technical solution, one end of the blocking member 59 is connected to the bottom wall 58531 of the second sub-cavity, thus bringing it closer to the inlet 53 that penetrates the bottom wall 58531 of the second sub-cavity. This allows it to promptly block sparks carried by the fluid after the fluid enters the second sub-cavity 5853 from the inlet 53. Furthermore, the blocking member 59 extends in the third direction Z, enabling it to effectively intercept and block sparks carried by the fluid as it enters the inlet 53. On the other hand, the blocking member 59 is aligned with the flow direction of the fluid, maximizing its spark-blocking effect without obstructing fluid flowout. By placing the blocking member 59 closer to the bottom wall 58531 of the second sub-cavity than the inlet 53, the blocking member 59 forms an effective barrier inside the explosion-proof section 58, preventing the propagation and diffusion of sparks, thereby reducing the probability of sparks and gas igniting together from the explosion-proof valve.

[0097] As an optional technical solution of this application, the inlet 53 is disposed in the second sub-cavity 5853 and penetrates the bottom wall 58531 of the second sub-cavity. One end of the blocking member 59 is connected to the main body 57, and the blocking member 59 extends in the third direction Z.

[0098] Specifically, please refer to Figure 2 and Figure 3 In some embodiments of this application, the inlet 53 is disposed inside the second sub-cavity 5853 and penetrates the bottom wall 58531 of the second sub-cavity. The inlet 53 communicates with the cavity 51. One end of the blocking member 59 is connected to the body portion 57. The blocking member 59 extends in the direction of the inlet 53 and is consistent with the main flow direction of the inlet 53, that is, consistent with the flow direction of the fluid.

[0099] In the above technical solution, one end of the blocking member 59 is connected to the main body 57 and does not obstruct the inlet 53. The blocking member 59 extends in the third direction Z, allowing it to effectively intercept and block sparks carried by the fluid as it enters the inlet 53. Furthermore, the blocking member 59 is aligned with the fluid flow direction, maximizing its spark-blocking effect without obstructing fluid outflow. Additionally, since the second sub-cavity 5853 requires an inlet 53, connecting one end of the blocking member 59 to the main body 57 reduces the manufacturing difficulty of constructing the second sub-cavity 5853. With this configuration, the blocking member 59 forms an effective barrier inside the explosion-proof section 58, preventing the propagation and diffusion of sparks, thereby reducing the probability of sparks and gas igniting together from the explosion-proof valve 30.

[0100] As an optional technical solution of this application, the inlet 53 is disposed in the second sub-cavity 5853 and penetrates the bottom wall 58531 of the second sub-cavity. One end of the blocking member 59 is connected to the bottom wall 58531 of the second sub-cavity, and the other end of the blocking member 59 is connected to the main body 57. The blocking member 59 extends in the third direction Z.

[0101] Specifically, please refer to Figure 2 and Figure 3 In some embodiments of this application, the inlet 53 is disposed inside the second sub-cavity 5853 and penetrates the bottom wall 58531 of the second sub-cavity. The inlet 53 communicates with the cavity 51. Please refer to... Figure 7 One end of the blocking member 59 is connected to the bottom wall 58531 of the second sub-cavity, and the other end of the blocking member 59 is connected to the main body 57. The blocking member 59 extends in the third direction Z, consistent with the main flow direction of the inlet 53, that is, consistent with the flow direction of the fluid.

[0102] In the above technical solution, one end of the blocking member 59 is connected to the bottom wall 58531 of the second sub-cavity, and the other end is connected to the main body 57, making the blocking member more fixed and ensuring its stability and reliability. Furthermore, the extending direction of the blocking member 59 is parallel to the axis of the inlet 53, enabling it to effectively intercept and block sparks carried by the fluid when it enters the inlet 53. On the other hand, when a spark is in the second sub-cavity 5853, the blocking member 59 can block the spark along the Z-direction path from the inlet 53 to the first side 571 of the main body in the Z-direction, maintaining consistency with the fluid flow direction and fully utilizing its spark-blocking effect without obstructing fluid flow. With this configuration, the blocking member 59 can form an effective barrier inside the explosion-proof section 58, preventing the propagation and diffusion of sparks, thereby reducing the probability of sparks and gas igniting together from the explosion-proof valve.

[0103] As an optional technical solution of this application, the inlet 53 is disposed in the second sub-cavity 5853 and penetrates the bottom wall 58531 of the second sub-cavity. At least one end of the blocking member 59 is connected to the side wall and the blocking member 59 extends along the length direction of the lower plastic 50.

[0104] Specifically, please refer to Figure 3 and Figure 7 In some embodiments of this application, the inlet 53 is disposed within the second sub-cavity 5853 and penetrates the bottom wall 58531 of the second sub-cavity, allowing the inlet 53 to be directly connected to the cavity 51. The blocking member 59 can be connected to any side wall or multiple side walls, thereby allowing the blocking member 59 to be securely fixed in the end cap assembly 100. The blocking member 59 extends along the length direction of the lower plastic 50, meaning that the extension direction of the blocking member 59 in space is the first direction X, which deviates from the flow direction of the inlet 53.

[0105] In the above technical solution, the inlet 53 penetrates the bottom wall 58531 of the second sub-cavity, allowing the inlet 53 to be directly connected to the cavity 51, thus enabling the fluid to flow smoothly from the inlet 53 into the cavity 51. The cavity 51 is also connected to the outlet 55, so the fluid can flow out from the outlet 55 to the explosion-proof hole 15 after entering the cavity 51. On the other hand, the blocking member 59 extends in the first direction X, which not only ensures that the position of the blocking member 59 does not affect the flow of fluid, but also prevents sparks carried in the fluid from entering the cavity 51 at the inlet 53.

[0106] As an optional technical solution of this application, the inlet 53 includes multiple inlets, which are distributed in a first array on the bottom wall 58531 and the side wall 58533 of the second sub-cavity. In other embodiments of this application, the multiple inlets 53 may be distributed in a first array on the bottom wall 58531 of the second sub-cavity, such as... Figures 9 to 11As shown. In other embodiments of this application, multiple inlets 53 may be distributed in a first array on the sidewalls 58533 of the second sub-cavity. Please refer to... Figure 7 The blocking element 59 comprises multiple components. Each blocking element 59 is one of the following: a columnar structure, a sheet structure, a strip structure, or a block structure with a single extension direction. The multiple blocking elements 59 are distributed in a second array within the cavity 51. In the projection plane, the projection rows and columns of the first array and the second array are staggered.

[0107] Specifically, please refer to Figure 3 and Figure 7 In some embodiments of this application, the inlet 53 includes multiple inlets, which are distributed in a first array on the bottom wall 58531 and side wall 58533 of the second sub-cavity. In other embodiments of this application, multiple inlets 53 may be distributed in a first array on the bottom wall 58531 of the second sub-cavity. In other embodiments of this application, multiple inlets 53 may be distributed in a first array on the side wall 58533 of the second sub-cavity. The multiple inlets 53 form a dispersed layout structure. In this application, it is in the form of a first array. The structure of the blocking member 59 is not limited; each blocking member 59 may be a columnar structure, a sheet structure, a strip structure, or a block structure. In some embodiments, the blocking member 59 may be a first blocking member 591; please refer to [link to relevant documentation]. Figure 9 The first blocking member 591 extends in a single direction. Specifically, the blocking member 59 on the side wall extends in the first direction X, which is opposite to the axis of the inlet 53. The first blocking member 591 on the bottom wall 58531 of the first sub-cavity extends in the third direction Z, which is parallel to the axis of the inlet 53. These diverse positional settings can be selected and configured according to specific needs to meet the blocking requirements in different scenarios. Furthermore, the first blocking members 591 are also distributed within the cavity 51, arranged in a second array to form an orderly structure. In the projection plane, the projection rows and columns of the first array and the second array intersect. This interlaced distribution helps to increase the coverage area of ​​the blocking members 59, thereby more effectively preventing the propagation of fluids and sparks.

[0108] In the above technical solution, multiple inlets 53 are distributed in a first array, which increases the number of channels for fluid to enter the cavity 51 and improves the efficiency of fluid entry and exit. The first blocking member 591 is arranged in a second array. In the projection plane, the projections of the first array and the second array are staggered. This staggered distribution helps to increase the coverage of the blocking member 59, confining sparks within the cavity 51. Furthermore, the regular shape and simple forming of the first blocking member 591 not only reduce the probability of sparks and gas igniting together from the explosion-proof valve 30, but also reduce the difficulty of the manufacturing process.

[0109] Please see Figure 10 As an optional technical solution of this application, the blocking member 59 includes at least two. Each blocking member 59 is a bent structure with multiple extending directions. In the XY projection plane, the projections of at least two blocking members 59 form a maze passage, and the projection of the inlet 53 is located within the maze passage.

[0110] Specifically, please refer to Figure 10 In some embodiments of this application, the blocking member 59 can be a second blocking member 593. Each second blocking member 593 is a bent structure with multiple extending directions, which can display complex curves and folded structures, such as bending, folding, and intersecting structures, within the projection plane XY. Within the XY projection plane, the projections of at least two second blocking members 593 form a maze channel. Furthermore, the two second blocking members 593 are flexibly arranged, allowing for various layouts without affecting the inlet 53. The projection of the inlet 53 is located inside this maze channel, effectively guiding fluid flow to the outlet 55 while limiting the propagation of sparks, thereby improving the safety and stability of the overall energy storage device 1000.

[0111] In the above technical solution, the number and density of the inlets 53 arranged in the first array are relatively large, which can more effectively guide the fluid into the cavity 51. The bending structure in multiple extending directions increases the extension direction of the blocking member 59 in three-dimensional space, forming a maze-like structure. The second blocking member 593 can extend the fluid channel, increase the difficulty for the spark to reach the outlet, and further improve the safety of the energy storage device.

[0112] Please see Figure 11 As an optional technical solution of this application, the blocking member 59 includes one member. The blocking member 59 is a bent structure with multiple extension directions. In the XY projection plane, the projection of the blocking member 59 forms a maze channel, and the projection of the inlet 53 is located in the maze channel.

[0113] Specifically, please refer to Figure 11 In some embodiments of this application, there is only one blocking member 59, which is opposite to the inlet 53 and has a bending structure extending in multiple directions. In this application, the blocking member 59 can be a third blocking member 595. The third blocking member 595 exhibits a complex multi-angle bending shape in the XY projection plane, forming a maze-like passage.

[0114] In the above technical solution, the third blocking member 595 forms a labyrinth channel. The projection of the inlet 53 is located inside the labyrinth channel, causing the fluid to enter the labyrinth channel when it flows through the inlet 53. The fluid is interfered with and restricted by the blocking member 59, resulting in a complex flow path, increasing the path length and resistance of the fluid, which helps to improve the control and regulation effect of the fluid. On the other hand, the third blocking member 595 can prevent sparks from being ejected in the first direction X and the second direction Y, while the first side 571 of the main body can prevent sparks from being ejected in the third direction Z. Therefore, the third blocking member 595 combined with the main body 57, the complex labyrinth channel can better restrict the sparks in the cavity 51 and prevent them from being ejected from the explosion-proof valve 30.

[0115] Please see Figure 7 , Figure 8 and Figure 12 As an optional technical solution of this application, the second sub-cavity 5853 includes two sub-cavities. In the width direction of the lower plastic 50, the two second sub-cavities 5853 are distributed on opposite sides of the first sub-cavity 5851. In the length direction of the lower plastic 50, the explosion-proof part 58 includes a first sidewall 58534 and a second sidewall 58535 spaced apart from each other. The first sidewall 58534 and the second sidewall 58535 are both closed structures and are used to prevent fluid from flowing into the cavity 51 from the first sidewall 58534 and the second sidewall 58535.

[0116] Specifically, in some embodiments of this application, the second sub-cavity 5853 includes two sub-cavities. The two second sub-cavities 5853 are distributed along the width direction (second direction Y) of the lower plastic 50, respectively located on opposite sides of the first sub-cavity 5851. In other embodiments of this application, the second sub-cavities 5853 only need to satisfy the requirement of surrounding the first sub-cavity 5851. Along the length direction of the lower plastic 50, the explosion-proof portion 58 includes a spaced-apart first sidewall 58534 and a second sidewall 58535, which respectively serve to prevent fluid from flowing into the first sub-cavity 5851 and the second sub-cavity 5853 from the first sidewall 58534 and the second sidewall 58535.

[0117] In the above technical solution, the two second sub-cavities 5853 are located on opposite sides of the first sub-cavity 5851 in the second direction Y, which enhances the capacity of the cavity 51. This allows the cavity 51 to accept fluid entering from multiple directions. Simultaneously, the location of the two second sub-cavities 5853 on opposite sides of the first sub-cavity 5851 also improves the fluid flow within the cavity 51, reduces fluid resistance, and thus ensures normal pressure relief when the internal pressure of the energy storage device 100 is excessive. Furthermore, since the second sub-cavities 5853 are located on opposite sides of the first sub-cavity 5851, the structure of the explosion-proof part 58 is more compact, which facilitates the integral molding of the explosion-proof part 58 and the main body 57. This also simplifies mold design and molding operations during manufacturing, improves production efficiency, and reduces production costs. In addition, the first sidewall 58534 and the second sidewall 58535 adopt a closed structure, which can prevent fluid from entering the cavity 51 from the first sidewall 58534 and the second sidewall 58535, thus preventing the fluid carrying sparks from entering the cavity 51 from the first sidewall 58534 and the second sidewall 58535. This balances the normal pressure relief of the fluid and also minimizes the possibility of sparks entering the cavity 51, thereby improving the safety performance of the energy storage device.

[0118] Please see Figure 8 As an optional technical solution of this application, at least one of the first sidewall 58534 and the second sidewall 58535 is provided with a notch 58537, and the notch 58537 is connected to the cavity 51.

[0119] Specifically, please refer to Figure 7 and Figure 8 In some embodiments of this application, a notch 58537 may be provided in the first sidewall 58534, or in the second sidewall 58535, or both the first sidewall 58534 and the second sidewall 58535 may have notches 58537. This application does not impose any limitations.

[0120] In the above technical solution, the explosion-proof part 58 includes a first sidewall 58534 and a second sidewall 58535, which are spaced apart from each other. When the internal pressure of the energy storage device 100 is very high, the fluid needs to quickly break through the explosion-proof valve 30 to release the pressure. At least one of the first sidewall 58534 and the second sidewall 58535 is provided with a notch 58537. The notch 58537 is connected to the cavity 51. When too much fluid rushes out of the energy storage device 1000 at once, the notch 58537 can act as an inlet 53, providing a new path for the fluid to enter the cavity 51. In this way, it helps the fluid to smoothly enter the cavity 51 and break through the explosion-proof valve 30, avoiding the safety problem caused by the pressure accumulated inside the energy storage device 1000. Meanwhile, the notch 58537 is located on at least one of the first sidewall 58534 and the second sidewall 58535. The flow direction of gas entering the cavity 51 through the notch 58537 is not directly upward, thus preventing sparks carried by the fluid from directly entering the cavity 51 and reacting with the side reaction gas that breaks through the explosion-proof valve 30, thereby preventing ignition. In other words, the notch 58537 allows fluid to enter the cavity 51 and break through the explosion-proof valve 30 for pressure relief, while also preventing sparks from being ejected towards the explosion-proof hole 15 and causing a fire.

[0121] Please see Figure 12 As an optional technical solution of this application, the lower plastic 50 includes a first insulating member 52 and a second insulating member 54. The explosion-proof part 58 protrudes from the body part 57 of the second insulating member 54 in a direction away from the end cap 10. The body part 57 of the first insulating member 52 is connected to the body part 57 of the second insulating member 54 to form a cavity 51.

[0122] Specifically, a first insulating member 52 is disposed on one side of the lower surface 11 of the end cap. A second insulating member 54 is disposed on the other side of the lower surface 11 of the end cap. In this application, the first insulating member 52 is on the left side relative to the second insulating member 54, and the second insulating member 54 is on the right side relative to the first insulating member 52. The body portion of the first insulating member 52 is connected to the body portion 57 of the second insulating member 54 to form a cavity 51. In some embodiments, the first insulating member 50 and the second insulating member 60 may also be integrally formed.

[0123] In the above technical solution, the lower plastic 50 is a separate component, allowing the first insulating member 52 and the second insulating member 54 to be molded separately and then assembled together to form the cavity 51, simplifying the molding of the cavity 51. Furthermore, the first insulating member 52 can be positioned on the first surface 11 of the end cap under the limiting effect of the second insulating member 54. The second insulating member 54 can also be positioned on the first surface 11 of the end cap under the limiting effect of the first insulating member 52, thereby improving the stability and portability of the installation of the first insulating member 52 and the second insulating member 54, and facilitating the disassembly of the lower plastic 50. Several specific embodiments of this application are illustrated below. Of course, this application is not limited to the following embodiments. As long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way, and all fall within the protection scope of this application.

[0124] In some specific embodiments, a blocking member 59 is disposed within the second sub-cavity 5853. The blocking member 59 within the second sub-cavity 5853 is used to prevent sparks carried by the fluid entering from the inlet 53 from being ejected into the first sub-cavity 5851. The inlet 53 is disposed within the second sub-cavity 5853 and penetrates the bottom wall 58531 of the second sub-cavity. Multiple inlets 53 are distributed in a first array on the bottom wall 58531 of the second sub-cavity. One end of the blocking member 59 is connected to the body portion 57. The blocking member 59 extends in a third direction Z. Multiple blocking members 59 are included. Each blocking member 59 is a columnar structure with a single extending direction. Multiple blocking members 59 are distributed in a second array within the second sub-cavity 5853. In the projection plane XY, the projection rows and columns of the first array and the second array intersect. The first sidewall 58534 is provided with a notch 58537. The notch 58537 communicates with the cavity 51.

[0125] In other specific embodiments, without changing other structures, the connection method of the blocking member 59 is not limited to being connected to the main body 57 in the above embodiments. It can also be: one end of the blocking member 59 is connected to the bottom wall 58531 of the second sub-cavity; or, one end of the blocking member 59 is connected to the bottom wall 58531 of the second sub-cavity, and the other end of the blocking member 59 is connected to the main body 57; or, at least one end of the blocking member 59 is connected to the side wall 58533 of the second sub-cavity, and the blocking member 59 extends along the length direction (first direction X) of the lower plastic 50.

[0126] In some specific embodiments, a blocking member 59 is disposed within the first sub-cavity 5851. The blocking member 59 within the first sub-cavity 5851 is used to prevent sparks carried by fluid entering the first sub-cavity 5851 from the second sub-cavity 5853 from being ejected toward the outlet 55. An inlet 53 is disposed within the second sub-cavity 5853 and penetrates the bottom wall 58531 of the second sub-cavity. Multiple inlets 53 are distributed in a first array on the bottom wall 58531 of the second sub-cavity. One end of the blocking member 59 is connected to the bottom wall 58511 of the first sub-cavity. The blocking member 59 extends in a third direction Z, but does not penetrate the explosion-proof 30. Multiple blocking members 59 are included. Each blocking member 59 is a columnar structure with a single extending direction. Multiple blocking members 59 are distributed in a second array within the first sub-cavity 5851. In the projection plane XY, the projection rows and columns of the first array and the second array are staggered. The first sidewall 58534 has a notch 58537, which is connected to the cavity 51.

[0127] In some embodiments, while other structures remain unchanged, the connection method of the blocking member 59 is not limited to being connected to the bottom wall 58511 of the first sub-cavity as described in the above embodiments. It can also be that at least one end of the blocking member 59 is connected to the side wall 58513 of the first sub-cavity, and the blocking member 59 extends along the length direction (first direction X) of the lower plastic 50. In still some embodiments, the blocking member 59 is disposed within the first sub-cavity 5851 and the second sub-cavity 5853. The blocking member 59 in the first sub-cavity 5851 is used to block sparks carried by fluid entering the first sub-cavity 5851 from the second sub-cavity 5853, preventing them from being ejected towards the outlet 55. The blocking member 59 in the second sub-cavity 5853 is used to block sparks carried by fluid entering from the inlet 53 from being ejected towards the first sub-cavity 5851. The inlet 53 is disposed within the second sub-cavity 5853 and penetrates the bottom wall 58531 of the second sub-cavity. Multiple inlets 53 are distributed in a first array on the bottom wall 58511 of the first sub-cavity and the bottom wall 58531 of the second sub-cavity. One end of the blocking member 59 is connected to the bottom wall 581 of the explosion-proof part (i.e., the bottom wall 58511 of the first sub-cavity and the bottom wall 58531 of the second sub-cavity). The blocking member 59 extends in a third direction Z. Multiple blocking members 59 are provided, each of which is a columnar structure with a single extension direction. The multiple blocking members 59 are distributed in a second array within the cavity 51. In the projection plane, the projection rows and columns of the first array and the second array are staggered. The first sidewall 58534 is provided with a notch 58537, which communicates with the cavity 51.

[0128] In other embodiments, with other structures remaining unchanged, the connection method of the blocking member 59 is not limited to being connected to the bottom wall 581 of the explosion-proof part as in this embodiment. It can also be: one end of the blocking member 59 located in the first sub-cavity 5851 is connected to the bottom wall 58511 of the first sub-cavity, and one end of the blocking member 59 located in the second sub-cavity 5853 is connected to the bottom wall 58531 of the second sub-cavity; or, one end of the blocking member 59 located in the first sub-cavity 5851 is connected to the bottom wall 58511 of the first sub-cavity, and one end of the blocking member 59 located in the second sub-cavity 5853 is connected to the bottom wall 58531 of the second sub-cavity. The main body 57 is connected; or, one end of the blocking member 59 located in the first sub-cavity 5851 is connected to the bottom wall 58511 of the first sub-cavity, and one end of the blocking member 59 located in the second sub-cavity 5853 is connected to the main body 57, and the other end of the blocking member 59 located in the second sub-cavity 5853 is connected to the bottom wall 58531 of the second sub-cavity; or, at least one end of the blocking member 59 is connected to the side wall 583 of the explosion-proof part (i.e., the side wall 58513 of the first sub-cavity and the side wall 58533 of the second sub-cavity), and the blocking member 59 extends along the length direction (first direction X) of the lower plastic 50.

[0129] Secondly, this application provides an energy storage device 1000, which includes the end cap assembly 100 of any of the above-mentioned technical solutions.

[0130] Specifically, the energy storage device 1000 of this application refers to a device capable of converting its stored chemical energy into electrical energy, that is, a device that converts pre-stored energy into usable electrical energy. The energy storage device 1000 can be charged and store electrical energy, and can also discharge to power other external devices. It is understood that the energy storage device 1000 may include, but is not limited to, single cells, battery packs, or battery systems.

[0131] Specifically, please refer to Figure 13 and Figure 14 In some embodiments of this application, the energy storage device 1000 can be a single battery cell, which can be a prismatic battery or a cylindrical battery. Specifically, the energy storage device 1000 includes an end cap assembly 100, an electrode assembly 200, and a housing 300.

[0132] Specifically, the housing 300 can be a cylindrical structure, and a receiving cavity is formed inside the housing 300 to accommodate the electrode assembly 300 and the electrolyte. At least one end of the housing 300 has an opening, allowing the electrode assembly 300 to be placed into the receiving cavity through the opening and covered by the end cap assembly 100. The housing 300 may include a metallic material, such as aluminum or aluminum alloy, or an insulating material, such as plastic. In some embodiments, the cross-sectional shape of the housing 300 can be circular, in which case the energy storage device 100 is a cylindrical single-cell battery. In other embodiments, the cross-sectional shape of the housing 300 can be rectangular, i.e., the energy storage device 100 is a square-structured single-cell battery. This application only uses a square-structured single-cell battery as an example for illustration.

[0133] The electrode assembly 300 includes a negative electrode, a positive electrode, and a separator. The separator is located between adjacent negative and positive electrodes to separate them. In one possible design, the negative electrode, separator, and positive electrode are sequentially stacked and wound to form the electrode assembly 300, i.e., the electrode assembly 300 has a wound structure. The electrode assembly 300 has gaps after formation, allowing electrolyte to enter and wet the negative and positive electrodes. The negative electrode includes a negative current collector (e.g., copper foil) and a negative active material layer (e.g., carbon or silicon) coated on the surface of the negative current collector. The positive electrode includes a positive current collector (e.g., aluminum foil) and a positive active material layer (e.g., ternary material, lithium iron phosphate, or lithium cobalt oxide) coated on the surface of the positive current collector.

[0134] The end cap assembly 100 is a component that covers the top opening of the housing 300 of the energy storage device 100, providing a sealed space for the electrode assembly 300 and electrolyte located inside the housing 300, while the electrical energy of the electrode assembly 300 can be led out to the outside through the pole post 70 of the end cap assembly 100.

[0135] Please see Figure 15 In other embodiments of this application, the energy storage device 1000 can be a battery pack. In this case, the energy storage device 1000 includes an end cap assembly 100 and an electrode assembly 200 (in conjunction with...). Figure 14 As shown), housing 300 and enclosure 500. The end cap assembly 100, electrode assembly 200, and housing 300 can constitute... Figure 13 and Figure 14The energy storage device 1000 includes multiple individual battery cells. A housing 500 provides a space for accommodating the individual battery cells, and the housing 500 can have various structures. In some embodiments, the housing 500 may include a first portion 501 and a second portion 503, which overlap each other, together defining a space for accommodating the individual battery cells. The second portion 503 may be a hollow structure with one open end, and the first portion 501 may be a plate-like structure, covering the open side of the second portion 503 so that the first portion 501 and the second portion 503 together define the space; alternatively, the first portion 501 and the second portion 503 may both be hollow structures with one open side, with the open side of the first portion 501 covering the open side of the second portion 503. Of course, the housing 500 formed by the first portion 501 and the second portion 503 can have various shapes, such as a cylinder or a cuboid. The energy storage device 1000 may also include other structures, such as a busbar for realizing electrical connection between multiple individual cells.

[0136] Please combine Figure 2 and Figure 7 In the above technical solution, when a partial short circuit occurs inside the energy storage device 1000, the ejected fluid may carry sparks. The staggered design of the inlet 53 and outlet 55 prevents sparks from being ejected directly from the inlet to the outlet as in traditional solutions. Instead, when the spark reaches the inlet 53 of the lower plastic 50, because the positions of the inlet 53 and outlet 55 do not coincide, there is a certain horizontal offset between them. Therefore, after the spark enters the inlet 53, its path is deflected inside the cavity 51, and it cannot directly rush out of the outlet 55 and spray upwards towards the explosion-proof hole 15. This avoids the safety hazard of fluids that could directly rush out of the outlet and potentially break through the explosion-proof valve, as is possible in traditional solutions. Therefore, the end cap assembly 100 can effectively isolate sparks and fluids, preventing sparks from also spraying directly upwards towards the explosion-proof hole 15, avoiding ignition of byproduct flammable gases and other fluids flowing outwards from the explosion-proof valve 30, and ensuring the safety of the energy storage device 1000.

[0137] Thirdly, this application provides an electrical device, which includes an energy storage device 1000 of any of the above technical solutions, and the energy storage device 1000 provides electrical energy to the electrical device.

[0138] Specifically, the end cap assembly 100 disclosed in this application can be used in electrical devices that use the energy storage device 1000 as a power source or in various energy storage systems that use the energy storage device 1000 as an energy storage element. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, or spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes (including drones), rockets, space shuttles, and spacecraft, etc.

[0139] This application only uses vehicle 10000 as an example of electrical equipment for illustration. Please refer to [link / reference]. Figure 16 , Figure 16 This is a structural schematic diagram of a vehicle 10000 provided for some embodiments of this application. The vehicle 10000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. An energy storage device 1000 is provided inside the vehicle 10000. The energy storage device 1000 can be located at the bottom, front, or rear of the vehicle 10000. The energy storage device 1000 can be used to supply power to the vehicle 10000; for example, it can serve as the operating power source for the vehicle 10000. The vehicle 10000 may also include a controller 2000 and a motor 3000. The controller 2000 controls the energy storage device 1000 to supply power to the motor 3000, for example, to meet the power needs of the vehicle 10000 during startup, navigation, and driving.

[0140] In some embodiments of this application, the energy storage device 1000 can not only serve as the operating power source for the vehicle 10000, but also as the driving power source for the vehicle 10000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 10000.

[0141] Please combine Figure 2 and Figure 7In the electrical equipment described above, when a partial short circuit occurs inside the energy storage device 1000, the ejected fluid may carry sparks. The staggered design of the inlet 53 and outlet 55 prevents sparks from being ejected directly from the inlet to the outlet as in traditional solutions. Instead, when the spark reaches the inlet 53 of the lower plastic 50, because the positions of inlet 53 and outlet 55 do not coincide, there is a certain horizontal offset between them. Therefore, after entering inlet 53, the spark's path is deflected within the cavity 51, preventing it from directly exiting from outlet 55 and spraying upwards towards the explosion-proof hole 15. This avoids the safety hazard of fluids that could directly exit from the outlet and potentially rupture the explosion-proof valve, as is present in traditional solutions. Therefore, the end cap assembly 100 effectively isolates sparks and fluids, preventing sparks from also directly spraying upwards towards the explosion-proof hole 15, thus avoiding ignition of byproduct flammable gases or other fluids flowing outwards after rupturing the explosion-proof valve 30, and ensuring the safety of the energy storage equipment.

[0142] 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 various 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 end cap assembly, characterized in that, The end cap assembly includes: An end cap, the end cap including a first side and a second side facing away from each other, the end cap having an explosion-proof hole penetrating the first side and the second side; An explosion-proof valve, wherein the explosion-proof valve is installed on the end cap and seals the explosion-proof port; and A lower plastic component is disposed on one side of the first surface of the end cap. The lower plastic component includes a body and an explosion-proof portion. The body includes a first side and a second side, with the second side facing the first surface. The body has an outlet penetrating the first side and the second side. The explosion-proof portion protrudes from the first side in a direction away from the end cap. The explosion-proof portion and the body together form a cavity. The side of the explosion-proof portion away from the body has an inlet. The cavity is connected to both the inlet and the outlet. The inlet is used to allow fluid to flow into the cavity. The outlet is aligned with the explosion-proof valve and is used to allow the fluid to flow from the cavity to the explosion-proof hole. In a projection plane perpendicular to the thickness direction of the lower plastic component, the projection of the inlet and the projection of the outlet are offset. The lower plastic component also includes: A blocking element is disposed within the cavity and located on the path of the spark carried by the fluid entering from the inlet and ejected toward the outlet; The explosion-proof part includes a bottom wall spaced apart from the main body and a side wall connecting the bottom wall and the main body. The bottom wall and the side wall together form a cavity. The cavity includes a first sub-cavity and a second sub-cavity surrounding the first sub-cavity. The first sub-cavity corresponds to the outlet. The bottom wall of the first sub-cavity is used to prevent fluid outside the first side of the main body from directly entering the cavity. The inlet is disposed on the bottom wall and / or the side wall of the second sub-cavity.

2. The end cap assembly according to claim 1, characterized in that, Within the projection plane, the projection of the bottom wall of the first sub-cavity completely covers the projection of the outlet.

3. The end cap assembly according to claim 1, characterized in that, The blocking element is disposed within the second sub-cavity, and the blocking element within the second sub-cavity is used to prevent the sparks carried by the fluid entering from the inlet from being ejected into the first sub-cavity; and / or The blocking member is disposed in the first sub-cavity, and the blocking member in the first sub-cavity is used to block the sparks carried by the fluid from the second sub-cavity from being ejected toward the outlet; and / or The blocking member is disposed at the junction of the first sub-cavity and the second sub-cavity, and the blocking member at the junction is used to prevent the sparks carried by the fluid entering from the second sub-cavity from being ejected into the first sub-cavity.

4. The end cap assembly according to claim 1, characterized in that, The inlet is located in the second sub-cavity and penetrates the bottom wall of the second sub-cavity. One end of the blocking member is connected to the bottom wall, and / or the other end of the blocking member is connected to the main body. The blocking member extends along the thickness direction of the lower plastic. or The inlet is located in the second sub-cavity and penetrates the bottom wall of the second sub-cavity. At least one end of the blocking member is connected to the side wall, and the blocking member extends along the length of the lower plastic.

5. The end cap assembly according to claim 1, characterized in that, The inlet includes multiple inlets, which are distributed in a first array on the bottom wall and / or side wall of the second sub-cavity; The blocking element comprises multiple components, each of which is one of a columnar structure, sheet structure, strip structure, or block structure with a single extension direction. The multiple blocking elements are distributed in the cavity according to a second array, and in the projection plane, the projection rows and columns of the first array and the second array intersect; or The blocking element includes at least two, each of which is a bent structure with multiple extending directions. In the projection plane, the projections of at least two of the blocking elements form a maze passage, and the projection of the inlet is located within the maze passage. or The blocking member includes one component, which is a bent structure with multiple extending directions. In the projection plane, the projection of the blocking member forms a maze passage, and the projection of the inlet is located within the maze passage.

6. The end cap assembly according to claim 1, characterized in that, The second sub-cavity includes two sub-cavities. In the width direction of the lower plastic, the two second sub-cavities are distributed on opposite sides of the first sub-cavity. In the length direction of the lower plastic, the explosion-proof part includes a first sidewall and a second sidewall spaced apart from each other. Both the first and second sidewalls are closed structures, used to prevent fluid from flowing into the cavity from the first and second sidewalls; or At least one of the first sidewall and the second sidewall is provided with a notch, and the notch communicates with the cavity.

7. The end cap assembly according to claim 1, characterized in that, The lower plastic includes: First insulating element; and The second insulating member has an explosion-proof portion that protrudes from the body portion of the second insulating member in a direction away from the end cap. The body portion of the first insulating member is connected to the body portion of the second insulating member to form the cavity.

8. An energy storage device, characterized in that, The energy storage device includes the end cap assembly according to any one of claims 1 to 7.

9. An electrical appliance, characterized in that, The electrical equipment includes the energy storage device as described in claim 8, wherein the energy storage device provides electrical energy to the electrical equipment.

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