End cap assembly, energy storage device and method for installing and positioning an end cap assembly

Abstract

An end cover assembly, an energy storage device and an end cover assembly mounting and positioning method, the end cover assembly comprising an end cover and a current collecting plate; the end cover is provided with an explosion-proof valve and a liquid injection hole, the liquid injection hole is distributed at intervals with the explosion-proof valve; the current collecting plate is coaxially arranged with the end cover, the current collecting plate comprises a main body part, a groove is arranged on the surface of the main body part facing the end cover, the groove extends from the center of the main body part to the edge of the main body part; wherein the liquid injection hole is used for aligning the end cover and the current collecting plate, so that the explosion-proof valve and the groove are relatively arranged along the axial direction of the current collecting plate, and the overlapping area of the normal projection of the explosion-proof valve on the current collecting plate and the groove is greater than 30% of the normal projection area of the explosion-proof valve. The end cover assembly, the energy storage device and the end cover assembly mounting and positioning method provided by the embodiment of the present application can shield and rebound through the groove when the energy storage device is subjected to impact, collision or drop, so that the electrolyte is not easy to directly impact the explosion-proof valve, and the probability of the explosion-proof valve being mistakenly triggered due to the impact of the electrolyte is reduced.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to an end cap assembly, an energy storage device, and a method for installing and positioning the end cap assembly. Background Technology

[0002] Energy storage devices mainly utilize the chemical elements inside the battery as the energy storage medium. The charging and discharging process is accompanied by chemical reactions or changes in the energy storage medium. Simply put, it stores the electrical energy generated by wind and solar energy in a chemical battery, and releases the stored electricity when the external power consumption reaches its peak, or transfers it to places with power shortages.

[0003] Taking a cylindrical battery in an energy storage device as an example, the cylindrical battery includes a casing, end caps, and electrode assemblies. Current collectors are welded to both ends of the electrode assembly. The end caps are fixedly connected to the open end of the casing to form a sealed cavity. The electrode assembly is located inside the sealed cavity. The current collectors at the bottom are welded to the bottom of the casing, and the current collectors at the top are electrically connected to the terminals on the end caps. An explosion-proof valve is installed on the end caps to promptly release pressure when the pressure inside the sealed cavity increases rapidly.

[0004] In the prior art, when a battery is subjected to impact, collision or drop, the electrolyte inside the battery is prone to impacting the explosion-proof valve, causing the explosion-proof valve to be falsely triggered. In the battery manufacturing process, it is difficult to accurately align the current collector and end cap to ensure that the current collector can block the electrolyte impacting the explosion-proof valve, which affects the safety performance and service life of the battery. Summary of the Invention

[0005] The purpose of this application is to provide an end cap assembly, an energy storage device, and an installation and positioning method for the end cap assembly, thereby solving the technical problem in the prior art of accurately aligning the manifold and the end cap to ensure that the manifold can block the electrolyte impacting the explosion-proof valve.

[0006] To achieve the objectives of this application, the following technical solution is provided:

[0007] In a first aspect, this application provides an end cap assembly, comprising:

[0008] An end cap having an explosion-proof valve and a liquid injection port, wherein the liquid injection port and the explosion-proof valve are spaced apart.

[0009] A collector plate is coaxially arranged with the end cover. The collector plate includes a main body, and a groove is formed on the surface of the main body facing the end cover. The groove extends from the center of the main body to the edge of the main body.

[0010] The injection hole is used to align the end cap and the manifold so that the explosion-proof valve and the groove are arranged opposite each other along the axial direction of the manifold, and the overlapping area of ​​the orthographic projection of the explosion-proof valve on the manifold and the groove is greater than 30% of the orthographic projection area of ​​the explosion-proof valve.

[0011] In this embodiment, the end cap and the collector plate are aligned by setting an injection hole so that the explosion-proof valve and the groove are arranged opposite each other along the axial direction of the collector plate, and the orthogonal projection of the explosion-proof valve on the collector plate is at least partially located in the groove. When the energy storage device is subjected to impact, collision or drop, the electrolyte inside the energy storage device housing will impact the side where the collector plate and end cap are located. After being blocked and rebounded by the groove, the flow direction of the electrolyte is deflected, making it less likely for the electrolyte to directly impact the explosion-proof valve, reducing the pressure on the explosion-proof valve, reducing the probability of the explosion-proof valve being accidentally triggered by the impact of the electrolyte, which is beneficial to improving the safety performance of the energy storage device and extending the service life of the energy storage device.

[0012] In one embodiment, the overlap area between the orthographic projection of the explosion-proof valve on the manifold and the groove is greater than 80% of the orthographic projection area of ​​the explosion-proof valve. In this embodiment, by setting the overlap area between the orthographic projection of the explosion-proof valve and the groove to be greater than 80% of the orthographic projection area of ​​the explosion-proof valve, it is beneficial to ensure the shielding and rebound effect of the groove on the electrolyte from the electrode assembly, and prevent the explosion-proof valve from being accidentally triggered and breaking under the impact of the electrolyte.

[0013] In one embodiment, the main body is further provided with a vent area, which includes a plurality of spaced through holes. In this embodiment, by providing through holes, a gas pressure relief channel is increased, which is beneficial for venting gas when the electrode assembly malfunctions, ensuring the amount of gas required for the normal opening of the explosion-proof valve, thereby timely gas pressure relief through the explosion-proof valve, preventing excessively high internal gas pressure in the energy storage device, and improving the safety and reliability of the energy storage device.

[0014] In one embodiment, the deflection angle of the groove relative to the vent area is the same as the deflection angle of the explosion-proof valve relative to the injection hole. During the alignment of the end cap assembly through the injection hole, it is only necessary to align the injection hole and the vent area, making them axially opposite each other along the manifold. This aligns the explosion-proof valve with the groove, reducing the difficulty of installing and positioning the end cap assembly and facilitating rapid alignment of the end cap and manifold.

[0015] In one embodiment, there are multiple grooves and vent areas, which are alternately distributed on the main body. By providing multiple grooves, multiple welding positions are provided for the manifold and electrode assembly, ensuring the stability and reliability of the connection between the manifold and the electrode assembly. By providing multiple vent areas, more gas pressure relief channels are added, which facilitates the discharge of gas in the event of electrode assembly failure, ensuring the gas volume required for the normal opening of the explosion-proof valve, thereby enabling timely gas pressure relief through the explosion-proof valve.

[0016] In one embodiment, the ratio of the inner diameter of the injection hole to the inner diameter of the through hole is 0.65 to 0.98. In this embodiment, by setting the ratio of the inner diameter of the injection hole to the inner diameter of the through hole to 0.65 to 0.98, during the process of injecting electrolyte into the electrode assembly through the injection hole, the injection hole and one of the through holes can be coaxially aligned, allowing the electrolyte to be directly injected into the electrode assembly through the manifold, thereby improving the injection efficiency.

[0017] In one embodiment, the injection hole and the explosion-proof valve are located at opposite radial ends of the end cap, and each of the grooves is radially opposite to a vent area along the manifold. In this embodiment, aligning the injection hole with any vent area allows the explosion-proof valve to be axially opposite to one of the grooves along the manifold, reducing the difficulty of installing and positioning the end cap assembly and facilitating rapid alignment of the end cap and manifold.

[0018] In one embodiment, in each of the vent areas, at least one of the through holes is a reference hole, and the distance between the reference hole and the central axis of the manifold is equal to the distance between the injection hole and the central axis of the end cap. By setting the distance between the reference hole and the central axis of the manifold to be equal to the distance between the injection hole and the central axis of the end cap, the injection hole can be coaxially aligned with the reference hole, that is, the central axes of the injection hole and the reference hole are on the same straight line. This facilitates determining the position of the explosion-proof valve relative to the manifold by the relative positional relationship between the injection hole and the reference hole, and helps to improve the alignment efficiency of the end cap and the manifold.

[0019] In one embodiment, the line connecting the reference hole and the central axis of the manifold is parallel to the length direction of the groove on the opposite side. In this embodiment, aligning the injection hole with any one of the reference holes allows the explosion-proof valve to be positioned opposite one of the grooves along the axial direction of the manifold, reducing the difficulty of installing and positioning the end cap assembly and facilitating the rapid alignment of the end cap and the manifold.

[0020] Secondly, this application provides an energy storage device, including the end cap assembly provided in any embodiment of the first aspect.

[0021] Thirdly, this application provides an end cap assembly installation and positioning method, applied to the end cap assembly provided in any embodiment of the first aspect, comprising:

[0022] Adjust the position of the explosion-proof valve relative to the manifold to ensure that the explosion-proof valve and the groove are positioned opposite each other along the axial direction of the manifold.

[0023] In this embodiment, by adjusting the position of the explosion-proof valve relative to the manifold, the explosion-proof valve and the groove are positioned opposite each other along the axial direction of the manifold. When the energy storage device is subjected to impact, collision, or drop, the electrolyte inside the energy storage device housing will impact the side where the manifold and end cap are located. After being blocked and rebounded by the groove, the flow direction of the electrolyte is deflected, making it less likely for the electrolyte to directly impact the explosion-proof valve. This reduces the pressure on the explosion-proof valve and lowers the probability of the explosion-proof valve being accidentally triggered due to electrolyte impact. This is beneficial to improving the safety performance of the energy storage device and extending its service life.

[0024] In one embodiment, the main body is further provided with a vent area, and the deflection angle of the groove relative to the vent area is the same as the deflection angle of the explosion-proof valve relative to the injection hole.

[0025] Adjusting the position of the explosion-proof valve relative to the manifold, and determining that the explosion-proof valve and the groove are arranged opposite each other along the axial direction of the manifold, includes:

[0026] The end cap is rotated along its own central axis so that the injection hole is aligned with the vent area.

[0027] During the alignment of the end cap assembly through the injection hole, it is only necessary to align the injection hole with the vent area and set the injection hole and vent area opposite each other along the axial direction of the manifold. This will align the explosion-proof valve with the groove and set the explosion-proof valve and the groove opposite each other along the axial direction of the manifold, reducing the difficulty of installing and positioning the end cap assembly and facilitating the quick alignment of the end cap and the manifold.

[0028] In one embodiment, rotating the end cap along its own central axis to align the injection hole with the vent area includes:

[0029] The first distance between the first region of the manifold and the detection device, and the second distance between the second region of the manifold and the detection device are obtained, wherein the detection device is located on the side of the injection hole away from the manifold and moves synchronously with the end cap, and one of the first region and the second region includes the groove and the other includes the vent area;

[0030] Compare the values ​​of the first distance and the second distance, and take the smaller value of the first distance and the second distance as the first target distance;

[0031] The end cap is rotated along its own central axis so that the area corresponding to the distance between the injection hole and the first target is arranged opposite to the end cap along the axial direction.

[0032] By obtaining the first distance between the first area on the manifold and the detection device, and the second distance between the second area on the manifold and the detection device, it is convenient to determine the magnitude of the first distance and the second distance, so as to determine which of the first distance and the second distance corresponds to the area containing the vent hole area, thereby adjusting the injection hole to align with the area where the vent hole area is located, and ensuring that the explosion-proof valve and the groove are set relative to each other along the axial direction of the manifold.

[0033] In one embodiment, obtaining the first distance between the first region of the collector disk and the detection device, and the second distance between the second region of the collector disk and the detection device, includes:

[0034] The injection hole and the first region are positioned opposite each other along the axial direction of the end cap to obtain the first distance;

[0035] The end cap is rotated along its own central axis so that the injection hole and the second region are positioned opposite each other along the axial direction of the end cap, thereby obtaining the second distance.

[0036] In one embodiment, the step of rotating the end cap along its own central axis includes:

[0037] The control drive device drives the end cap to rotate along its own central axis, wherein the drive device is connected to the end cap in a transmission connection.

[0038] In this embodiment, the automation level and control accuracy of the end cap assembly installation and positioning method are improved.

[0039] In one embodiment, comparing the numerical values ​​of the first distance and the second distance, and taking the smaller of the first distance and the second distance as the first target distance, further includes:

[0040] The larger of the first distance and the second distance is taken as the second target distance;

[0041] The first target distance and the second target distance satisfy the following relationship:

[0042]

[0043] Wherein, H1 is the distance to the first target, and H2 is the distance to the second target.

[0044] By setting the above relationships, it is convenient to determine the installation position of the detection device based on factors such as the depth of the groove and the distance between the collector and the end cap, thus ensuring the detection effect.

[0045] In one embodiment, the first target distance is the distance between the bottom of the groove and the detection device, and the second target distance is the distance between the surface of the vent area near the end cap and the detection device.

[0046] In one embodiment, there are multiple grooves and multiple vent areas, and the multiple grooves and multiple vent areas are alternately distributed on the main body.

[0047] There are multiple first regions and multiple second regions. Each first region and each second region includes a groove or a vent area. Multiple first regions and multiple second regions are alternately distributed on the manifold.

[0048] In this embodiment, by setting multiple first regions and multiple second regions alternately distributed on the manifold, the detection device can be aligned with any one of the first or second regions, enabling the detection device to complete the conversion between the first and second regions with a small displacement, reducing the detection difficulty of the detection device, improving the detection efficiency of the detection device, and facilitating the rapid alignment of the end cap and the manifold.

[0049] The end cap assembly, energy storage device, and end cap assembly installation and positioning method provided in this application embodiment align the end cap and the manifold by setting an injection hole, so that the explosion-proof valve and the groove are arranged opposite each other along the axial direction of the manifold, and the orthogonal projection of the explosion-proof valve on the manifold is at least partially located in the groove. When the energy storage device is subjected to impact, collision, or drop, the electrolyte inside the energy storage device housing will impact the side where the manifold and end cap are located. After being blocked and rebounded by the groove, the flow direction of the electrolyte is deflected, making it less likely for the electrolyte to directly impact the explosion-proof valve, reducing the pressure on the explosion-proof valve, and reducing the probability of the explosion-proof valve being accidentally triggered due to electrolyte impact. This is beneficial to improving the safety performance of the energy storage device and extending the service life of the energy storage device. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0051] Figure 1 This is a schematic diagram of the structure of a residential energy storage system according to one embodiment;

[0052] Figure 2 This is a schematic diagram of the structure of an end cap assembly according to one embodiment;

[0053] Figure 3 This is a schematic diagram of the end cap structure according to one embodiment;

[0054] Figure 4 This is a schematic diagram of the structure of a collector disk according to one embodiment;

[0055] Figure 5 This is a schematic diagram showing the relative positions of the manifold and the explosion-proof valve in one embodiment;

[0056] Figure 6 This is a flowchart illustrating an embodiment of an end cap assembly installation and positioning method;

[0057] Figure 7 yes Figure 6 A flowchart of step S10.

[0058] Explanation of reference numerals in the attached figures:

[0059] 100-Energy storage device; 200-Electric power conversion device; 300-User load; 1-End cap; 11-Explosion-proof valve; 12-Injection hole; 13-Mounting hole; 2-Collector; 21-Main body; 22-Groove; 23-Ventilation area; 231-Through hole; 232-Reference hole; 24-Boss. Detailed Implementation

[0060] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0061] It should be noted that when a component is said to be "fixed" to another component, it can be directly on the other component or it can be in a middle component. When a component is said to be "connected" to another component, it can be directly connected to the other component or it may be in a middle component.

[0062] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0064] In the description of the embodiments of this application, it should be noted that the orientation or positional relationship of the terms "center", "upper", "lower", "inner", "outer" and other indicators are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and are not intended to 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 this application.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0067] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve its efficiency, we need a medium or device to store one form of energy in the same way or by converting it into another, and then release it in a specific energy form for future applications. As we all know, to achieve the grand goal of carbon neutrality, the main way to generate green electricity is currently through the development of green energy sources such as photovoltaics and wind power to replace fossil fuels.

[0068] Currently, the generation of green electricity generally relies on solar, wind, and hydropower. However, wind and solar power are generally characterized by strong intermittency and large fluctuations, which can cause grid instability, insufficient electricity during peak demand periods, and excessive electricity during off-peak periods. Unstable voltage can also damage the power grid. Therefore, insufficient electricity demand or insufficient grid capacity may lead to the problem of "wind and solar curtailment." To solve these problems, energy storage is necessary. This involves converting electrical energy into other forms of energy through physical or chemical means and storing it, then releasing the energy back into electricity when needed. Simply put, energy storage is like a large "power bank," storing electrical energy when solar and wind power are abundant and releasing the stored electricity when needed.

[0069] Taking electrochemical energy storage as an example, this application provides an energy storage device 100. The energy storage device 100 is equipped with a set of energy storage batteries. It mainly uses the chemical elements in the battery as the energy storage medium. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium. Simply put, it stores the electrical energy generated by wind and solar energy in the chemical battery. When the use of external electrical energy reaches its peak, the stored electrical energy is released for use, or transferred to places with a shortage of electricity for use.

[0070] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, renewable energy grid-connected energy storage, and user-side energy storage. The corresponding types of energy storage devices 100 include:

[0071] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, enabling load matching of electrical energy in time and space, enhancing the absorption capacity of renewable energy, and playing a significant role in grid system backup, alleviating peak load power supply pressure, and peak regulation and frequency regulation.

[0072] (2) Small and medium-sized energy storage cabinets used in commercial and industrial energy storage scenarios (banks, shopping malls, etc.) and small household energy storage boxes used in residential energy storage scenarios primarily operate under the "peak shaving and valley filling" mode. Because there are significant price differences in electricity consumption during peak and off-peak periods, users with energy storage devices typically charge the cabinets / boxes during off-peak hours to reduce costs; during peak hours, they release the stored electricity for use, thus saving on electricity bills. Furthermore, in remote areas and regions prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices effectively provides backup power for users and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0073] This application uses a home energy storage scenario in user-side energy storage as an example for illustration. The energy storage device 100 provided in this application is not limited to the home energy storage scenario.

[0074] This application provides a residential energy storage system, such as... Figure 1 As shown, the residential energy storage system includes a power conversion device 200, user loads 300, and an energy storage device 100. The energy storage device 100 is a small energy storage box that can be wall-mounted on an outdoor wall. The user loads 300 can be streetlights or household appliances. Specifically, the power conversion device 200 can be a photovoltaic panel, which can convert solar energy into electrical energy during periods of low electricity prices. The energy storage device 100 is used to store this electrical energy and supply it to streetlights and household appliances during periods of high electricity prices, or to provide power during power outages / power failures.

[0075] It is understood that the energy storage device 100 may include, but is not limited to, single cells, battery modules, battery packs, and battery systems. When the energy storage device 100 is a single cell, it may be a cylindrical cell or a prismatic cell.

[0076] This application provides an electrical device, including an energy storage device 100, which supplies power to the electrical device. The electrical device may include a user load 300, a vehicle, electronic equipment, household appliances, etc.

[0077] Specifically, the energy storage device 100 includes an end cap assembly, an electrode assembly, and a housing. The electrode assembly is located within the space enclosed by the housing. The end cap 1 of the end cap assembly is connected to the housing and is used to close one side opening of the housing.

[0078] like Figures 2 to 5 As shown, the end cap assembly provided in this embodiment includes an end cap 1 and a manifold 2. The end cap 1 has an explosion-proof valve 11 and an injection hole 12, with the injection hole 12 and the explosion-proof valve 11 spaced apart. The manifold 2 is coaxially arranged with the end cap 1 and includes a main body 21. A groove 22 is formed on the surface of the main body 21 facing the end cap 1, and the groove 22 extends from the center of the main body 21 to the edge of the main body 21.

[0079] The injection hole 12 is used to align the end cap 1 and the manifold 2 so that the explosion-proof valve 11 and the groove 22 are arranged opposite each other along the axial direction of the manifold 2, and the overlapping area of ​​the orthographic projection of the explosion-proof valve 11 on the manifold 2 and the groove 22 is greater than 30% of the orthographic projection area of ​​the explosion-proof valve 11.

[0080] like Figure 4 As shown, the main body 21 of the current collector 2 can be in the shape of a circular flat plate, which allows the current collector 2 to be adapted to the cross-sectional shape of the cylindrical battery casing, thus enabling its widespread application in cylindrical batteries. It also facilitates the attachment of the wound electrode assembly to the current collector 2 and the end cap 1 to the current collector 2, ensuring a sealed connection between the current collector 2 and the cylindrical battery casing.

[0081] When the energy storage device 100 malfunctions, a large amount of gas will be generated in the sealed cavity of the energy storage device 100, causing a sharp increase in the gas pressure in the sealed cavity. If the large amount of gas in the sealed cavity of the energy storage device 100 is not discharged in time, the energy storage device 100 may explode, causing a safety accident. By installing an explosion-proof valve 11 on the end cover 1, the gas in the sealed cavity of the energy storage device 100 can be discharged in time, reducing the safety risk. For example, the explosion-proof valve 11 is plate-shaped, and a stress-weak area is provided on the explosion-proof valve 11. When the pressure exerted on the explosion-proof valve 11 by the gas pressure in the sealed cavity of the energy storage device 100 reaches the maximum pressure that the stress-weak area can withstand, the stress-weak area of ​​the explosion-proof valve 11 will rupture, thereby discharging the large amount of gas in the sealed cavity and timely relieving the pressure in the sealed cavity.

[0082] The main body 21 has a first surface and a second surface disposed opposite to each other. Specifically, when the end cap assembly is assembled to the energy storage device 100, the first surface is the side facing away from the electrode assembly, and the second surface of the main body 21 is the side facing the electrode assembly. A groove 22 is recessed in the main body 21, extending from the central axis of the main body 21 towards the edge of the main body 21. The groove 22 provides welding space for the collector plate 2 and the electrode assembly. The groove 22 is recessed relative to the first surface and extends in the radial direction of the main body 21. The groove 22 can be formed by stamping the first surface of the main body 21 and correspondingly forming a protrusion on the second surface.

[0083] The injection hole 12 is used to align the end cap 1 and the manifold 2 during the installation of the end cap assembly. For example, the surface of the manifold 2 can be identified and judged through the injection hole 12, and the position of the explosion-proof valve 11 relative to the manifold can be adjusted to ensure that the explosion-proof valve 11 and the groove 22 are axially opposite each other on the manifold 2, and that the orthogonal projection of the explosion-proof valve 11 on the manifold 2 is at least partially located in the groove 22. It is understood that the orthogonal projection of the explosion-proof valve 11 on the manifold 2 is the projection of the explosion-proof valve 11 along a direction parallel to the central axis of the manifold 2 and pointing from the end cap 1 to the manifold 2. Figure 5 As shown, when viewed along the axial direction of the collector plate 2, the explosion-proof valve 11 and the groove 22 at least partially overlap. When the energy storage device 100 is impacted by collision, drop, or other reasons, if the electrolyte immersed in the electrode assembly moves from the position of the electrode assembly to the position of the explosion-proof valve 11, the electrolyte will be blocked by the groove 22. The groove 22 bears part of the impact caused by the electrolyte, which plays a buffering role on the explosion-proof valve 11, reduces the impact pressure from the electrolyte on the explosion-proof valve 11, and prevents the explosion-proof valve 11 from being accidentally triggered and broken under the impact of the electrolyte. This is beneficial to improving the safety performance of the energy storage device 100 and extending the service life of the energy storage device 100.

[0084] like Figure 3 and Figure 4 As shown, a mounting hole 13 is provided at the central axis position of the end cap 1, and a boss 24 protruding outward relative to the first surface is provided at the central axis position of the collector plate 2. The boss 24 is inserted into the mounting hole 13 to connect the end cap 1 and the collector plate 2. Optionally, the boss 24 is rotatably inserted into the mounting hole 13, so that the end cap 1 and the collector plate 2 can rotate relative to each other, which facilitates the adjustment of the relative position of the explosion-proof valve 11 with respect to the collector plate 2.

[0085] The end cap assembly provided in this application embodiment aligns the end cap 1 and the collector plate 2 by providing an injection hole 12, so that the explosion-proof valve 11 and the groove 22 are arranged opposite each other along the axial direction of the collector plate 2, and the orthogonal projection of the explosion-proof valve 11 on the collector plate 2 is at least partially located in the groove 22. When the energy storage device 100 is subjected to impact, collision or drop, the electrolyte inside the housing of the energy storage device 100 will impact the side where the collector plate 2 and the end cap 1 are located. After being blocked and impacted by the groove 22, the flow direction of the electrolyte is deflected, making it less likely for the electrolyte to directly impact the explosion-proof valve 11, reducing the pressure on the explosion-proof valve 11, reducing the probability of the explosion-proof valve 11 being accidentally triggered due to the impact of the electrolyte, which is beneficial to improving the safety performance of the energy storage device 100 and extending the service life of the energy storage device 100.

[0086] In a further embodiment, the overlapping area of ​​the orthographic projection of the explosion-proof valve 11 on the manifold 2 and the groove 22 is greater than 80% of the orthographic projection area of ​​the explosion-proof valve 11. In this embodiment, by setting the overlapping area of ​​the orthographic projection of the explosion-proof valve 11 and the groove 22 to be greater than 80% of the orthographic projection area of ​​the explosion-proof valve 11, it is beneficial to ensure the shielding and rebound effect of the groove 22 on the electrolyte from the electrode assembly, and prevent the explosion-proof valve 11 from being accidentally triggered and broken under the impact of the electrolyte.

[0087] The main body 21 is also provided with a vent area 23, which includes a plurality of spaced through holes 231 that penetrate the thickness direction of the main body 21. By providing the through holes 231, a gas pressure relief channel is increased, which is beneficial for venting gas when the electrode assembly is out of control, ensuring the amount of gas required for the normal opening of the explosion-proof valve 11, thereby timely gas pressure relief through the explosion-proof valve 11, preventing excessively high internal gas pressure in the energy storage device 100, and improving the safety and reliability of the energy storage device 100.

[0088] Multiple through holes 231 can be arranged in an array on the main body 21 to improve the uniformity and timeliness of gas pressure relief. For example, multiple through holes 231 can be arranged in a ring on the main body 21; or multiple through holes 231 can be arranged in a row along the radial direction of the main body 21. In a specific embodiment, such as Figure 4As shown, the vent area 23 includes nine through holes 231, which are arranged in a 3×3 rectangular array.

[0089] Furthermore, the inner diameter of the through hole 231 is larger than the inner diameter of the injection hole 12, and the ratio of the inner diameter of the injection hole 12 to the inner diameter of the through hole 231 is 0.65 to 0.98. Specifically, the ratio of the inner diameter of the injection hole 12 to the inner diameter of the through hole 231 can be 0.65, 0.7, 0.8, 0.98, etc. When the ratio of the inner diameter of the injection hole 12 to the inner diameter of the through hole 231 is within the above range, the injection efficiency is better, avoiding waste of injection adhesive due to an excessively large injection hole 12 diameter. When the ratio of the inner diameter of the injection hole 12 to the inner diameter of the through hole 231 is less than the above range, the injection efficiency is poor during the injection of liquid into the electrode assembly through the injection hole 12. When the ratio of the inner diameter of the injection hole 12 to the inner diameter of the through hole 231 is greater than the above range, the injection hole 12 diameter is too large, leading to waste of injection adhesive.

[0090] In one embodiment, the deflection angle of the groove 22 relative to the vent area 23 is the same as the deflection angle of the explosion-proof valve 11 relative to the injection hole 12. It can be understood that the deflection angle of the groove 22 relative to the vent area 23 is the angle between the line connecting the geometric center of the groove 22 and the central axis of the manifold 2, and the line connecting the geometric center of the vent area 23 and the central axis of the manifold 2; the deflection angle of the explosion-proof valve 11 relative to the injection hole 12 is the angle between the line connecting the geometric center of the explosion-proof valve 11 and the central axis of the end cap 1, and the line connecting the central axis of the injection hole 12 and the central axis of the end cap 1. It should be noted that the deflection angle is a vector with both magnitude and direction. The deflection angle of the groove 22 relative to the vent area 23 is the same as the deflection angle of the explosion-proof valve 11 relative to the injection hole 12. That is, the deflection direction of the groove 22 relative to the vent is the same as the deflection direction of the explosion-proof valve 11 relative to the injection hole 12, and the deflection angle of the groove 22 relative to the vent is the same as the deflection angle of the explosion-proof valve 11 relative to the injection hole 12. There can be one or more grooves 22 and vent areas 23. When there are multiple grooves 22 and vent areas 23, aligning the injection hole 12 with any one of the vent areas 23 can complete the alignment of the end cap 1 and the manifold 2, reducing the difficulty of installing and positioning the end cap assembly and improving the production efficiency of the end cap assembly.

[0091] By setting the deflection angle of the groove 22 relative to the vent area 23 to be the same as the deflection angle of the explosion-proof valve 11 relative to the injection hole 12, during the alignment of the end cap assembly through the injection hole 12, it is only necessary to align the injection hole 12 with the vent area 23, so that the injection hole 12 and the vent area 23 are set opposite each other along the axial direction of the manifold 2. This will align the positions of the explosion-proof valve 11 and the groove 22, and set the explosion-proof valve 11 and the groove 22 opposite each other along the axial direction of the manifold 2. This reduces the difficulty of installing and positioning the end cap assembly and facilitates the quick alignment of the end cap 1 and the manifold 2.

[0092] In one embodiment, there are multiple grooves 22 and vent areas 23, which are alternately distributed on the main body 21. Specifically, the multiple grooves 22 are distributed at intervals along the circumference of the main body 21, and a vent area 23 is provided between any two adjacent grooves 22. For example Figure 4 As shown, there are three grooves 22 and three vent areas 23, which are alternately distributed on the main body 21. By setting multiple grooves 22, multiple welding positions are provided for the collector plate 2 and the electrode assembly, ensuring the stability and reliability of the connection between the collector plate 2 and the electrode assembly; by setting multiple vent areas 23, the gas pressure relief channel is increased, which is beneficial to the gas outlet when the electrode assembly is out of control, ensuring the amount of gas required for the normal opening of the explosion-proof valve 11, so as to timely relieve gas pressure through the explosion-proof valve 11.

[0093] Furthermore, the injection hole 12 and the explosion-proof valve 11 are located at the radial ends of the end cap 1, and each groove 22 is arranged radially opposite to a vent area 23 along the manifold 2. Figure 3 As shown, the line connecting the injection hole 12 to the central axis of the end cap 1 and the line connecting the explosion-proof valve 11 to the central axis of the end cap 1 are on the same straight line, and the included angle between the injection hole 12 and the explosion-proof valve 11 is 180°. Figure 4 As shown, there are three grooves 22 and three vent areas 23. These three grooves 22 and three vent areas 23 are evenly distributed on the main body 21, and they are alternately distributed. Each groove 22 is radially opposite to one of the vent areas 23 along the manifold 2. In this embodiment, aligning the injection hole 12 with any one of the vent areas 23 allows the explosion-proof valve 11 to be axially opposite to one of the grooves 22 along the manifold 2, reducing the difficulty of installing and positioning the end cap assembly and facilitating the rapid alignment of the end cap 1 and the manifold 2.

[0094] Furthermore, in each vent area 23, at least one through hole 231 serves as a reference hole 232. The distance between the reference hole 232 and the central axis of the manifold 2 is equal to the distance between the injection hole 12 and the central axis of the end cap 1. Each vent area 23 can have one or more reference holes 232. By setting the distance between the reference hole 232 and the central axis of the manifold 2 to be equal to the distance between the injection hole 12 and the central axis of the end cap 1, the injection hole 12 can be coaxially aligned with the reference hole 232. That is, the central axes of the injection hole 12 and the reference hole 232 are on the same straight line. This facilitates determining the position of the explosion-proof valve 11 relative to the manifold 2 through the relative positional relationship between the injection hole 12 and the reference hole 232, thus improving the alignment efficiency of the end cap 1 and the manifold 2.

[0095] In one specific embodiment, the line connecting the reference hole 232 and the central axis of the collector disk 2 is parallel to the length direction of the groove 22 on the opposite side. For example... Figure 4 As shown, each vent area 23 includes a reference hole 232. Each reference hole 232 is radially opposite to a groove 22 along the collector plate 2. The line connecting each reference hole 232 and the central axis of the collector plate 2 is parallel to the length direction of the opposite groove 22. Since the injection hole 12 and the explosion-proof valve 11 are located at the radial ends of the end cap 1, aligning the injection hole 12 with any reference hole 232 will allow the explosion-proof valve 11 to be axially opposite to one of the grooves 22 along the collector plate 2. This reduces the difficulty of installing and positioning the end cap assembly and facilitates the rapid alignment of the end cap 1 and the collector plate 2.

[0096] It is understandable that when the deflection angle of the explosion-proof valve 11 relative to the injection hole 12 is not 180°, the angle between the line connecting the reference hole 232 and the central axis of the manifold 2 and the length direction of one of the grooves 22 is the same as the deflection angle of the explosion-proof valve 11 relative to the injection hole 12. For example, when the deflection angle of the explosion-proof valve 11 relative to the injection hole 12 is 90°, each reference hole 232 has the following relationship with one of the grooves 22: the angle between the line connecting the reference hole 232 and the central axis of the manifold 2 and the length direction of one of the grooves 22 is 90°, so that the explosion-proof valve 11 and one of the grooves 22 can be arranged relative to each other along the axial direction of the manifold 2 when the injection hole 12 is aligned with any reference hole 232.

[0097] This application also provides an end cap assembly installation and positioning method, applicable to the end cap assembly provided in any of the above embodiments, such as... Figure 6 As shown, the method includes:

[0098] S10: Adjust the position of the explosion-proof valve 11 relative to the manifold 2 to ensure that the explosion-proof valve 11 and the groove 22 are set opposite each other along the axial direction of the manifold 2.

[0099] The end cap assembly includes an end cap 1 and a manifold 2. The end cap 1 has an explosion-proof valve 11 and an injection port 12, with the injection port 12 spaced apart from the explosion-proof valve 11. The manifold 2 is coaxially arranged with the end cap 1 and includes a main body 21. A groove 22 is formed on the surface of the main body 21 facing the end cap 1, extending from the center of the main body 21 to its edge. The injection port 12 is used to align the end cap 1 and the manifold 2, so that the explosion-proof valve 11 and the groove 22 are positioned opposite each other along the axial direction of the manifold 2, and the overlap area between the orthographic projection of the explosion-proof valve 11 on the manifold 2 and the groove 22 is greater than 30% of the orthographic projection area of ​​the explosion-proof valve 11.

[0100] In step S10, the position of the explosion-proof valve 11 relative to the collector plate 2 is adjusted manually or by a driving device. Specifically, the position of the explosion-proof valve 11 relative to the groove 22 on the collector plate 2 is adjusted until the explosion-proof valve 11 and the groove 22 are positioned opposite each other along the axial direction of the collector plate 2. At this time, the orthogonal projection of the explosion-proof valve 11 on the collector plate 2 is at least partially located in the groove 22. When the energy storage device 100 is impacted by collision, drop, or other reasons, if the electrolyte immersed in the electrode assembly moves from the position of the electrode assembly to the position of the explosion-proof valve 11, the electrolyte will be blocked by the groove 22. The groove 22 bears part of the impact caused by the electrolyte, which plays a buffering role on the explosion-proof valve 11, reduces the impact pressure from the electrolyte on the explosion-proof valve 11, and prevents the explosion-proof valve 11 from being accidentally triggered and broken under the impact of the electrolyte. This is beneficial to improving the safety performance of the energy storage device 100 and extending the service life of the energy storage device 100.

[0101] The end cap assembly installation and positioning method provided in this application embodiment adjusts the position of the explosion-proof valve 11 relative to the collector plate 2 to determine that the explosion-proof valve 11 and the groove 22 are arranged opposite each other along the axial direction of the collector plate 2. When the energy storage device 100 is subjected to impact, collision or drop, the electrolyte inside the housing of the energy storage device 100 will impact the side where the collector plate 2 and the end cap 1 are located. After being blocked and rebounded by the groove 22, the flow direction of the electrolyte is deflected, making it less likely for the electrolyte to directly impact the explosion-proof valve 11, reducing the pressure on the explosion-proof valve 11, reducing the probability of the explosion-proof valve 11 being accidentally triggered due to the impact of the electrolyte, which is beneficial to improving the safety performance of the energy storage device 100 and extending the service life of the energy storage device 100.

[0102] Furthermore, the main body 21 is also provided with a vent area 23, and the deflection angle of the groove 22 relative to the vent area 23 is the same as the deflection angle of the explosion-proof valve 11 relative to the injection hole 12. Step S10 involves adjusting the position of the explosion-proof valve 11 relative to the manifold 2 to ensure that the explosion-proof valve 11 and the groove 22 are positioned opposite each other along the axial direction of the manifold 2, including:

[0103] The end cap 1 is rotated along its own central axis so that the injection hole 12 is aligned with the vent area 23.

[0104] Since the deflection angle of the groove 22 relative to the vent area 23 is the same as the deflection angle of the explosion-proof valve 11 relative to the injection hole 12, during the alignment of the end cap assembly through the injection hole 12, it is only necessary to align the injection hole 12 with the vent area 23 and set the injection hole 12 and the vent area 23 opposite each other along the axial direction of the manifold 2. This will align the positions of the explosion-proof valve 11 and the groove 22, and set the explosion-proof valve 11 and the groove 22 opposite each other along the axial direction of the manifold 2. This reduces the difficulty of installing and positioning the end cap assembly and facilitates the quick alignment of the end cap 1 and the manifold 2.

[0105] In a specific embodiment, such as Figure 7 As shown, step S10 involves adjusting the position of the explosion-proof valve 11 relative to the manifold 2, ensuring that the explosion-proof valve 11 and the groove 22 are positioned opposite each other along the axial direction of the manifold 2, including:

[0106] S11: Obtain the first distance between the first region of the collecting plate 2 and the detection device, and the second distance between the second region of the collecting plate 2 and the detection device, wherein the detection device is located on the side of the injection hole 12 away from the collecting plate 2 and moves synchronously with the end cap 1, and one of the first region and the second region includes a groove 22 and the other includes a vent area 23.

[0107] S12: Compare the numerical values ​​of the first distance and the second distance, and take the smaller value of the first distance and the second distance as the first target distance;

[0108] S13: Drive the end cap 1 to rotate along its own central axis so that the area corresponding to the distance between the injection hole 12 and the first target is set opposite to the axial direction of the end cap 1.

[0109] The detection device can be a laser rangefinder, ultrasonic rangefinder, infrared rangefinder, or other device with distance measuring function. The detection device is positioned above the injection hole 12 (and on the side of the injection hole 12 away from the collector plate 2), and detects the distance between itself and the collector plate 2 through the injection hole 12. The collector plate 2 is pre-divided into two regions: a region including the groove 22 and a region including the vent hole. The two regions do not overlap, and the groove 22 and the vent hole region 23 are not located in the same region. The first region is the region where distance is detected first by the detection device in sequence, and the second region is the region where distance is detected later by the detection device in sequence.

[0110] Since the groove 22 is recessed relative to the surface of the collector plate 2 near the end cap 1, the distance between the detection device and the collector plate 2 has two values: one is the distance between the detection device and the groove 22, and the other is the distance between the detection device and the surface of the collector plate 2 near the end cap 1 in the vent area 23. The distance between the detection device and the groove 22 is greater than the distance between the detection device and the surface of the collector plate 2 near the end cap 1 in the vent area 23.

[0111] Before step S11, the end cap assembly has not been installed and positioned, and the position of the explosion-proof valve 11 relative to the groove 22 on the manifold 2 cannot be determined. It is also impossible to determine whether the area aligned with the detection device is the area containing the groove 22 or the area containing the vent hole. By obtaining the first distance between the first area on the manifold 2 and the detection device, and the second distance between the second area on the manifold 2 and the detection device in step S11, it is convenient to determine the size of the first distance and the second distance in step S12, so as to determine which of the first distance and the second distance corresponds to the area containing the vent hole area 23. Thus, in step S13, the injection hole 12 is adjusted to align with the area where the vent hole area 23 is located, ensuring that the explosion-proof valve 11 and the groove 22 are set relative to each other along the axial direction of the manifold 2.

[0112] In a specific embodiment, the distance between the first region on the manifold 2 and the detection device is detected by the detection device and is taken as the first distance Ha; the end cap 1 is rotated in a specific direction along its own central axis until the detection device is aligned with the second region through the injection hole 12, and the distance between the second region on the manifold 2 and the detection device is detected by the detection device and is taken as the second distance Hb; after obtaining the first distance Ha and the second distance Hb, the magnitudes of the first distance Ha and the second distance Hb are compared manually or by a control device, and the smaller value of the first distance Ha and the second distance Hb is taken as the first target distance H1; if the first distance Ha is less than the second distance Hb, then the first region is the region including the vent area 23, and the end cap 1 is rotated in the opposite direction along its own central axis to align the vent with the first region, thus completing the alignment of the end cap 1 and the manifold 2; if the first distance Ha is greater than the second distance Hb, then the second region is the region including the vent area 23, and at this time the vent is aligned with the second region, and there is no need to rotate the end cap 1, thus completing the alignment of the end cap 1 and the manifold 2. During the rotation of the end cap 1 along its own central axis, the detection device can determine the conversion of its aligned area based on the change in the detected distance value. For example, if the change in the distance value is greater than the preset change, it means that the detection device has moved from the area containing the groove 22 to the area containing the vent 23, or the detection device has moved from the area containing the vent 23 to the area containing the groove 22.

[0113] In one embodiment, there are multiple grooves 22 and vent areas 23, which are alternately distributed on the main body 21. There are also multiple first and second regions, each including one groove 22 or one vent area 23. These multiple first and second regions are alternately distributed on the collecting plate 2. In this embodiment, by setting multiple first and second regions to alternately distribute on the collecting plate 2, the detection device can be aligned with any one of the first or second regions. This allows the detection device to complete the conversion between the first and second regions with a small displacement, reducing the detection difficulty and improving the detection efficiency, thus facilitating the rapid alignment of the end cap 1 and the collecting plate 2.

[0114] Further, obtaining the first distance between the first region of the collector plate 2 and the detection device, and the second distance between the second region of the collector plate 2 and the detection device in step S11, includes:

[0115] The injection hole 12 is positioned opposite to the first region along the axial direction of the end cap 1 to obtain a first distance; the end cap 1 is rotated along its own central axis to make the injection hole 12 and the second region positioned opposite to each other along the axial direction of the end cap 1 to obtain a second distance.

[0116] The first region and the second region are two regions with different detection sequences in terms of timing. The detection device first detects the distance between itself and the first region through the injection hole 12 as the first distance, and then moves to the second region to detect the distance between itself and the second region through the injection hole 12 as the second distance.

[0117] Furthermore, it drives the end cap 1 to rotate along its own central axis, including:

[0118] The control drive device drives the end cover 1 to rotate along its own central axis. The drive device is connected to the end cover 1 in a transmission connection.

[0119] In this embodiment, the end cap 1 is moved by a driving device, which can be a rotary motor, linear motor, etc., to improve the automation and control accuracy of the end cap assembly installation and positioning method. The driving device can be directly connected to the end cap 1 or indirectly connected through a transmission element. It is understood that the driving device is connected to the detection device, and the driving device can simultaneously drive the end cap 1 and the detection device to move.

[0120] In one embodiment, step S12, which compares the numerical values ​​of the first distance and the second distance and takes the smaller of the two distances as the first target distance, further includes:

[0121] The larger of the first and second distances is taken as the second target distance.

[0122] The distance between the first target and the distance between the second target satisfy the following relationship:

[0123]

[0124] Where H1 is the distance to the first target and H2 is the distance to the second target.

[0125] By setting the above relationship, it is convenient to determine the installation position of the detection device based on factors such as the depth of the groove 22 and the distance between the collector plate 2 and the end cover 1, so as to ensure the detection effect.

[0126] Specifically, the first target distance is the distance between the bottom of the groove 22 and the detection device, and the second target distance is the distance between the surface of the vent area 23 near the end cap 1 and the detection device.

[0127] In the description of this specification, the references to terms such as "embodiment," "specific embodiment," "example," or "specific example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0128] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art will understand that all or part of the processes for implementing the above embodiments and equivalent variations made in accordance with the claims of this application are still within the scope of this application.

Claims

1. An end cap assembly, characterized in that, include: The end cap (1) has an explosion-proof valve (11) and a liquid injection hole (12), wherein the liquid injection hole (12) and the explosion-proof valve (11) are spaced apart; The collector plate (2) is coaxially arranged with the end cap (1). The collector plate (2) includes a main body (21). The main body (21) has a groove (22) on its surface facing the end cap (1). The groove (22) extends from the center of the main body (21) to the edge of the main body (21). The injection hole (12) is used to align the end cap (1) and the manifold (2) so that the explosion-proof valve (11) and the groove (22) are arranged opposite each other along the axial direction of the manifold (2), and the overlapping area of ​​the orthographic projection of the explosion-proof valve (11) on the manifold (2) and the groove (22) is greater than 30% of the orthographic projection area of ​​the explosion-proof valve (11).

2. The end cap assembly according to claim 1, characterized in that, The overlapping area of ​​the orthographic projection of the explosion-proof valve (11) on the manifold (2) and the groove (22) is greater than 80% of the orthographic projection area of ​​the explosion-proof valve (11).

3. The end cap assembly according to claim 1, characterized in that, The main body (21) is also provided with a vent area (23), which includes a plurality of through holes (231) spaced apart.

4. The end cap assembly according to claim 3, characterized in that, The deflection angle of the groove (22) relative to the vent area (23) is the same as the deflection angle of the explosion-proof valve (11) relative to the injection hole (12).

5. The end cap assembly according to claim 3, characterized in that, There are multiple grooves (22) and multiple vent areas (23), and the multiple grooves (22) and multiple vent areas (23) are alternately distributed on the main body (21).

6. The end cap assembly according to claim 3, characterized in that, The ratio of the inner diameter of the injection hole (12) to the inner diameter of the through hole (231) is 0.65 to 0.

98.

7. The end cap assembly according to claim 5, characterized in that, The injection hole (12) and the explosion-proof valve (11) are located at the radial ends of the end cap (1), and any of the grooves (22) are arranged opposite to a vent area (23) along the radial direction of the collecting plate (2).

8. The end cap assembly according to claim 7, characterized in that, In each of the vent areas (23), at least one of the through holes (231) is a reference hole (232), and the distance between the reference hole (232) and the central axis of the manifold (2) is equal to the distance between the injection hole (12) and the central axis of the end cap (1).

9. The end cap assembly according to claim 8, characterized in that, The line connecting the reference hole (232) and the central axis of the collector plate (2) is parallel to the length direction of the groove (22) on the opposite side.

10. An energy storage device, characterized in that, Includes the end cap assembly as described in any one of claims 1 to 9.

11. A method for installing and positioning an end cap assembly, applied to the end cap assembly according to any one of claims 1 to 9, characterized in that, include: Adjust the position of the explosion-proof valve relative to the manifold to ensure that the explosion-proof valve and the groove are positioned opposite each other along the axial direction of the manifold.

12. The end cap assembly installation and positioning method according to claim 11, characterized in that, The main body is also provided with a vent area, and the deflection angle of the groove relative to the vent area is the same as the deflection angle of the explosion-proof valve relative to the injection hole. Adjusting the position of the explosion-proof valve relative to the manifold, and determining that the explosion-proof valve and the groove are arranged opposite each other along the axial direction of the manifold, includes: The end cap is rotated along its own central axis so that the injection hole is aligned with the vent area.

13. The end cap assembly installation and positioning method according to claim 12, characterized in that, Adjusting the position of the explosion-proof valve relative to the manifold, and determining that the explosion-proof valve and the groove are arranged opposite each other along the axial direction of the manifold, includes: The first distance between the first region of the manifold and the detection device, and the second distance between the second region of the manifold and the detection device are obtained, wherein the detection device is located on the side of the injection hole away from the manifold and moves synchronously with the end cap, and one of the first region and the second region includes the groove and the other includes the vent area; Compare the values ​​of the first distance and the second distance, and take the smaller value of the first distance and the second distance as the first target distance; The end cap is rotated along its own central axis so that the area corresponding to the distance between the injection hole and the first target is arranged opposite to the end cap along the axial direction.

14. The end cap assembly installation and positioning method according to claim 13, characterized in that, The step of obtaining the first distance between the first region of the collector disk and the detection device, and the second distance between the second region of the collector disk and the detection device, includes: The injection hole and the first region are positioned opposite each other along the axial direction of the end cap to obtain the first distance; The end cap is rotated along its own central axis so that the injection hole and the second region are positioned opposite each other along the axial direction of the end cap, thereby obtaining the second distance.

15. The end cap assembly installation and positioning method according to claim 14, characterized in that, The process of rotating the end cap along its central axis includes: The control drive device drives the end cap to rotate along its own central axis, wherein the drive device is connected to the end cap in a transmission connection.

16. The end cap assembly installation and positioning method according to claim 13, characterized in that, The step of comparing the numerical values ​​of the first distance and the second distance, and taking the smaller of the two distances as the first target distance, further includes: The larger of the first distance and the second distance is taken as the second target distance; The first target distance and the second target distance satisfy the following relationship: Wherein, H1 is the distance to the first target, and H2 is the distance to the second target.

17. The end cap assembly installation and positioning method according to claim 16, characterized in that, The first target distance is the distance between the bottom of the groove and the detection device, and the second target distance is the distance between the surface of the vent area near the end cap and the detection device.

18. The end cap assembly installation and positioning method according to claim 13, characterized in that, There are multiple grooves and multiple vent areas, and the multiple grooves and multiple vent areas are alternately distributed on the main body; There are multiple first regions and multiple second regions. Each first region and each second region includes a groove or a vent area. The multiple first regions and multiple second regions are alternately distributed on the manifold.

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