End Cover Assembly, Energy Storage Device and Method for Installing and Positioning End Cover Assembly

Abstract

An end cover assembly, an energy storage device, and a method for installing and positioning the end cover assembly. The end cover assembly includes an end cover and a current collector plate. The end cover has an explosion-proof valve and a liquid injection hole, and the liquid injection hole and the explosion-proof valve are spaced apart. The current collector plate is coaxially arranged with the end cover. The current collector plate includes a main body portion. A groove is formed on the surface of the main body portion facing the end cover, and the groove extends from the center of the main body portion to the edge of the main body portion along the radial direction of the main body portion. A visual recognition portion is provided on the main body portion, and the visual recognition portion has a visual recognition feature different from the area other than the visual recognition portion on the main body portion. The liquid injection hole is used to align the end cover and the current collector plate through the visual recognition portion. In the end cover assembly, the energy storage device, and the method for installing and positioning the end cover assembly provided by the embodiments of the present application, when the energy storage device is impacted, struck, or dropped, through the shielding and counterattack of the groove, the electrolyte is not easily directly impacted on the explosion-proof valve, reducing the probability of the explosion-proof valve being accidentally triggered due to the impact of the electrolyte.

Description

Technical Field

[0001] The present application relates to the technical field of battery manufacturing, and particularly relates to an end cover assembly, an energy storage device, and a method for installing and positioning the end cover assembly. Background Art

[0002] An energy storage device mainly uses chemical elements in a battery as an energy storage medium. The charge and discharge process is accompanied by chemical reactions or changes of the energy storage medium. Briefly speaking, it stores the electric energy generated by wind energy and solar energy in a chemical battery, and then releases the stored electric energy for use when the external electric energy usage reaches a peak, or transfers it to places with a shortage of electric energy for further use.

[0003] Taking a cylindrical battery in an energy storage device as an example, the cylindrical battery includes a housing, an end cover, and an electrode assembly. Current collectors are welded to both ends of the electrode assembly respectively. The end cover is fixedly connected to the open end of the housing to enclose a sealed cavity. The electrode assembly is located in the sealed cavity. The current collector located at the bottom is welded to the bottom of the housing, and the current collector located at the top is electrically connected to a pole column on the end cover. Among them, an explosion-proof valve is installed on the end cover, which is used to exhaust and relieve pressure in time when the air pressure in the sealed cavity increases sharply.

[0004] In the prior art, when the battery is subjected to impact, collision, or drop, the electrolyte in the battery is likely to impact the explosion-proof valve, causing mis-triggering of the explosion-proof valve. Moreover, during the production and manufacturing process of the battery, it is difficult to accurately align the current collector and the end cover to ensure that the current collector can block the electrolyte that impacts the explosion-proof valve, which affects the safety performance and service life of the battery. Summary of the Invention

[0005] The purpose of the present application is to provide an end cover assembly, an energy storage device, and a method for installing and positioning the end cover assembly, so as to solve the technical problem in the prior art that it is difficult to accurately align the current collector and the end cover, and ensure that the current collector can block the electrolyte that impacts the explosion-proof valve.

[0006] To achieve the purpose of the present application, the following technical solutions are provided in the present application:

[0007] In the first aspect, the present application provides an end cover assembly, which is characterized by including:

[0008] An end cover, which has an explosion-proof valve and a liquid injection hole, and the liquid injection hole and the explosion-proof valve are distributed at intervals;

[0009] A current collector, which is coaxially arranged with the end cover. The current collector includes a main body portion. A groove is formed on the surface of the main body portion facing the end cover. The groove extends along the radial direction of the main body portion from the center of the main body portion to the edge of the main body portion. A visual recognition portion is provided on the main body portion, and the visual recognition portion has a visual recognition feature different from the area other than the visual recognition portion on the main body portion;

[0010] Among them, the liquid injection hole is used to align the end cap and the current collector tray through the visual recognition part, so that the explosion-proof valve and the groove are arranged opposite to each other along the axial direction of the current collector tray, and the overlapping area of the orthographic projection of the explosion-proof valve on the current collector tray and the groove is greater than or equal to 30% of the orthographic projection area of the explosion-proof valve.

[0011] In this embodiment, by providing a liquid injection hole and using the visual recognition part to align the end cap and the current collector tray, it is convenient to accurately align the current collector tray and the end cap during the production and manufacturing process of the energy storage device, so that the explosion-proof valve and the groove are arranged opposite to each other along the axial direction of the current collector tray, and at least part of the orthographic projection of the explosion-proof valve on the current collector tray is located in the groove.

[0012] In one embodiment, the visual recognition features of the visual recognition part include at least one of color, pattern, and transparency.

[0013] In one embodiment, the visual recognition part includes a first anti-reflection layer coated with a black anti-reflection coating. By providing the first anti-reflection layer, not only can laser reflection be avoided during laser welding of the current collector tray and the electrode assembly, but the first anti-reflection layer can also be used as a visual recognition feature, eliminating the need for additional processing of the visual recognition part, which helps to save coating costs and improve the process cycle and efficiency.

[0014] In one embodiment, the deflection angle of the groove relative to the visual recognition part is the same as the deflection angle of the explosion-proof valve relative to the liquid injection hole;

[0015] When the liquid injection hole and the visual recognition part are arranged opposite to each other along the axial direction of the current collector tray, the explosion-proof valve and the groove are arranged opposite to each other along the axial direction of the current collector tray, and the overlapping area of the orthographic projection of the explosion-proof valve on the current collector tray and the groove is greater than 30% of the orthographic projection area of the explosion-proof valve.

[0016] In this embodiment, during the process of aligning the end cap assembly through the liquid injection hole, it is only necessary to align the liquid injection hole with the visual recognition part, so that the liquid injection hole and the visual recognition part are arranged opposite to each other along the axial direction of the current collector tray, then the positions of the explosion-proof valve and the groove can be aligned, making the explosion-proof valve and the groove arranged opposite to each other along the axial direction of the current collector tray, reducing the installation and positioning difficulty of the end cap assembly, and facilitating the rapid alignment of the end cap and the current collector tray.

[0017] In one embodiment, the number of the visual recognition parts and the number of the grooves are both multiple, and the multiple visual recognition parts and the multiple grooves are alternately distributed one by one on the main body part.

[0018] By providing multiple grooves, multiple welding positions are provided for the current collector plate and the electrode assembly, ensuring the stability and reliability of the connection between the current collector plate and the electrode assembly; by providing multiple visual recognition parts on the main body part, during the installation process of the end cover assembly, the alignment of the current collector plate of the end cover can be completed by using one of the visual recognition parts, reducing the difficulty of aligning the end cover and the current collector plate through the visual recognition part, and being beneficial to improving the alignment and installation efficiency of the end cover assembly.

[0019] In one embodiment, the visual recognition features of at least two of the visual recognition parts are different.

[0020] By setting the visual recognition features of at least two visual recognition parts to be different, it is beneficial to distinguish the multiple visual recognition parts, facilitating the targeted adjustment of the position of the explosion-proof valve relative to the current collector plate according to different visual recognition parts, realizing the positioning of the end cover and the current collector plate, and preventing the explosion-proof valve from being accidentally triggered by the impact of the electrolyte.

[0021] In one embodiment, the liquid injection hole and the explosion-proof valve are distributed along the radial direction of the end cover, and any one of the grooves is disposed opposite to one of the visual recognition parts along the radial direction of the current collector plate.

[0022] In this embodiment, when the liquid injection hole is aligned with any one of the visual recognition parts, the explosion-proof valve can be disposed opposite to one of the grooves along the axial direction of the current collector plate, reducing the installation and positioning difficulty of the end cover assembly and being beneficial to quickly completing the alignment of the end cover and the current collector plate.

[0023] In one embodiment, the shape of the visual recognition part is adapted to the shape of the liquid injection hole.

[0024] By setting the shape of the visual recognition part to be adapted to the shape of the liquid injection hole, it is beneficial to distinguish the visual recognition part from other areas on the main body part during the alignment process and quickly recognize the visual recognition part, improving the alignment efficiency of the end cover and the current collector plate.

[0025] In one embodiment, the orthographic projection area of the liquid injection hole on the current collector plate is smaller than the area of the visual recognition part, and the ratio of the orthographic projection area of the liquid injection hole on the current collector plate to the area of the visual recognition part is 0.51 - 0.98.

[0026] In this embodiment, when recognizing the current collector plate through the liquid injection hole, the visual recognition part can be quickly and effectively recognized, which is beneficial to quickly completing the alignment of the end cover and the current collector plate.

[0027] In one embodiment, a second anti-reflection layer is provided on the surface of the end cover close to the current collector plate to prevent the recognition effect of the visual recognition part from being affected by the reflection on the surface of the end cover.

[0028] In one embodiment, the main body portion is further provided with a ventilation hole area, the ventilation hole area includes a plurality of through holes arranged at intervals, and the visual recognition portion is located within the ventilation hole area.

[0029] By providing the ventilation hole area, the gas pressure relief channel is increased, which is beneficial to discharging the gas when the electrode assembly gets out of control, ensuring the gas volume required for the normal valve opening of the explosion-proof valve, thereby timely relieving the gas pressure through the explosion-proof valve, preventing the internal air pressure of the energy storage device from being too high, and being beneficial to improving the safety and reliability of the energy storage device.

[0030] In one embodiment, the distance between each through hole and the central axis of the current collector plate is less than the distance between the liquid injection hole and the central axis of the end cover.

[0031] In this embodiment, it can make the orthographic projection of the liquid injection hole on the current collector plate not overlap with the through hole, preventing the through hole from affecting the recognition effect of the visual recognition portion during the positioning process through the liquid injection hole.

[0032] In one embodiment, the shape of the visual recognition portion is different from the shape of the through hole.

[0033] By setting the shape of the visual recognition portion to be different from the shape of the through hole, it is beneficial to distinguish the visual recognition portion from the through hole during the alignment process and quickly recognize the visual recognition portion, improving the alignment efficiency of the end cover and the current collector plate.

[0034] In one embodiment, the area of the visual recognition portion is larger than the opening area of each through hole, and the ratio of the area of the visual recognition portion to the opening area of the through hole is 1.05 - 1.76, which is convenient for quickly recognizing the visual recognition portion and improving the alignment efficiency of the end cover and the current collector plate.

[0035] In one embodiment, the overlapping area of the orthographic projection of the explosion-proof valve on the current collector plate and the groove is greater than 80% of the orthographic projection area of the explosion-proof valve, which is beneficial to ensuring the shielding and counterattack effect of the groove on the electrolyte from the electrode assembly, preventing the explosion-proof valve from being mis-triggered and broken under the impact of the electrolyte.

[0036] In a second aspect, the present application provides an energy storage device, including the end cover assembly provided in any one of the embodiments of the first aspect.

[0037] In a third aspect, the present application provides a method for positioning an end cover assembly, which is applied to the end cover assembly provided in any one of the embodiments of the first aspect. The method for positioning the end cover assembly includes:

[0038] Adjust the position of the explosion-proof valve relative to the current collector plate according to the visual recognition portion, and determine that the explosion-proof valve and the groove are axially oppositely arranged along the current collector plate.

[0039] In one implementation, the deflection angle of the groove relative to the visual recognition part is the same as the deflection angle of the explosion-proof valve relative to the liquid injection hole;

[0040] Determining that the explosion-proof valve and the groove are axially opposite to each other along the manifold specifically includes:

[0041] Determining that the liquid injection hole is aligned with the visual recognition part.

[0042] In one implementation, the visual recognition feature includes at least one of color, pattern, and transparency;

[0043] Determining that the liquid injection hole is aligned with the visual recognition part specifically includes:

[0044] Determining that the visual recognition feature of the area aligned with the liquid injection hole is the visual recognition feature of the visual recognition part.

[0045] In one implementation, the visual recognition feature includes a color parameter, the color parameter includes a weighted RGB value, the weighted RGB value of the visual recognition part is greater than a preset weighted RGB value, and the preset RGB value of the area other than the visual recognition part on the main body part is less than the preset weighted RGB value;

[0046] Determining that the visual recognition feature of the area aligned with the liquid injection hole is the visual recognition feature of the visual recognition part includes:

[0047] Obtaining the weighted RGB value of the area aligned with the liquid injection hole;

[0048] Determining that the weighted RGB value of the area aligned with the liquid injection hole is greater than the preset weighted RGB value.

[0049] In one implementation, the weighted RGB value satisfies the following color parameter relation:

[0050] M = aR + bG + cB;

[0051] where M is the weighted RGB value, a is the first weighting coefficient, b is the second weighting coefficient, c is the third weighting coefficient, R is the red component, G is the green component, and B is the blue component;

[0052] Obtaining the weighted RGB value of the area aligned with the liquid injection hole specifically includes:

[0053] Obtaining the red component, the green component, and the blue component of the area aligned with the liquid injection hole;

[0054] According to the color parameter relation, obtaining the weighted RGB value of the area aligned with the liquid injection hole.

[0055] The end cap assembly, energy storage device, and end cap assembly installation and positioning method provided by the embodiments of the present application use a liquid injection hole and a vision recognition part to align the end cap and the current collector plate, facilitating accurate alignment of the current collector plate and the end cap during the production and manufacturing process of the energy storage device, such that the explosion-proof valve and the groove are axially opposite to each other along the current collector plate, and at least a part of the orthographic projection of the explosion-proof valve on the current collector plate is 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 towards the side where the current collector plate and the end cap are located. After being blocked and reflected by the groove, the flow direction of the electrolyte deflects, making it difficult for the electrolyte to directly impact the explosion-proof valve, reducing the pressure on the explosion-proof valve, and decreasing the probability of the explosion-proof valve being accidentally triggered due to the impact of the electrolyte. This is beneficial to improving the safety performance of the energy storage device and extending the service life of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0057] Figure 1 is a schematic structural diagram of a household energy storage system according to an embodiment;

[0058] Figure 2 is a schematic structural diagram of an end cap assembly according to an embodiment;

[0059] Figure 3 is a schematic structural diagram of an end cap according to an embodiment;

[0060] Figure 4 is a schematic structural diagram of a current collector plate according to an embodiment;

[0061] Figure 5 is a schematic diagram of the relative position between a current collector plate and an explosion-proof valve according to an embodiment;

[0062] Figure 6 is a schematic flowchart of an end cap assembly installation and positioning method according to an embodiment.

[0063] DESCRIPTION OF REFERENCE NUMERALS:

[0064] 100 - energy storage device; 200 - power conversion device; 300 - user load; 1 - end cap; 11 - explosion-proof valve; 12 - liquid injection hole; 13 - mounting hole; 2 - current collector plate; 21 - main body part; 22 - groove; 23 - ventilation hole area; 231 - through hole; 24 - boss; 25 - vision recognition part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0065] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part rather than all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0066] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time.

[0067] In the present application, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0068] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the present application in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the present application includes any and all combinations of one or more of the related listed items.

[0069] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is the orientation or positional relationship based on the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0070] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0071] The following will, in conjunction with the accompanying drawings, elaborate on some embodiments of the present application. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0072] Since the energy required by people has strong temporality and spatiality, in order to rationally utilize energy and improve the energy utilization rate, it is necessary to store one form of energy in the same or converted into another form of energy through a medium or device, and then release it in a specific energy form based on future application needs. As is well known, to achieve the major goal of carbon neutrality, the current main way to generate green electric energy is to develop green energy such as photovoltaic and wind power to replace fossil energy.

[0073] Currently, the generation of green electric energy generally depends on photovoltaic, wind power, water potential, etc. However, problems such as strong intermittency and large volatility are common in wind energy and solar energy, which will cause grid instability, insufficient electricity during peak electricity consumption, and too much electricity during low electricity consumption. The unstable voltage will also damage the power. Therefore, due to insufficient electricity demand or insufficient grid acceptance capacity, the problem of "abandoning wind and light" may be triggered. To solve these problems, energy storage is required, that is, converting electric energy into other forms of energy through physical or chemical means and storing it, and then converting the energy into electric energy and releasing it when needed. Simply put, energy storage is similar to a large "portable power bank", which stores electric energy when photovoltaic and wind energy are sufficient and releases the stored electricity when needed.

[0074] Taking electrochemical energy storage as an example, the embodiment of the present application provides an energy storage device 100. A chemical battery is provided inside the energy storage device 100, which mainly uses chemical elements in the chemical battery as the energy storage medium. The charge and discharge process is accompanied by chemical reactions or changes of the energy storage medium. Simply put, it stores the electric energy generated by wind energy and solar energy in the chemical battery, and then releases the stored electricity when the external electricity usage reaches the peak, or transfers it to places with a shortage of electricity for further use.

[0075] Currently, the application scenarios of current energy storage (i.e., energy storage) are relatively extensive, including power generation side energy storage, grid side energy storage, renewable energy grid connection energy storage, and user side energy storage, etc. The types of the corresponding energy storage device 100 include:

[0076] (1) A large energy storage container applied to the grid side energy storage scenario, which can be used as a high-quality active and reactive power regulation power source in the grid, achieve load matching of electric energy in time and space, enhance the consumption capacity of renewable energy, and is of great significance in terms of grid system standby, alleviating the power supply pressure during peak loads, and peak shaving and frequency modulation;

[0077] (2) Medium and small-sized energy storage cabinets applied to industrial and commercial energy storage scenarios (such as banks, shopping malls, etc.) on the user side and household small-sized energy storage boxes applied to household energy storage scenarios on the user side mainly operate in the mode of "peak shaving and valley filling". Due to the large price difference in electricity charges at peak and valley positions according to electricity consumption demands, after users have energy storage devices, in order to reduce costs, they usually charge the energy storage cabinet / box during the low electricity price period; during the high electricity price period, they then discharge the electricity in the energy storage device for use to achieve the purpose of saving electricity charges. In addition, in remote areas and areas with high incidences of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing backup power for themselves and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0078] In the embodiments of the present application, the household energy storage scenario in user-side energy storage is taken as an example for illustration, and the energy storage device 100 provided in the embodiments of the present application is not limited to the household energy storage scenario.

[0079] The embodiments of the present application provide a household energy storage system, as Figure 1 shown. This household energy storage system includes an electric energy conversion device 200, a user load 300, etc., and an energy storage device 100. The energy storage device 100 is a small-sized energy storage box that can be installed on an outdoor wall in a wall-mounted manner. The user load 300 can be street lamps or household appliances, etc. Specifically, the electric energy conversion device 200 can be a photovoltaic panel. The photovoltaic panel can convert solar energy into electric energy during the low electricity price period. The energy storage device 100 is used to store this electric energy and supply it to street lamps and household appliances for use during the high electricity price period, or supply power when the power grid is powered off / out of power.

[0080] It can be understood that the energy storage device 100 may include but is not limited to single cells, battery modules, battery packs, battery systems, etc. When the energy storage device 100 is a single cell, it can be a cylindrical battery or a square battery.

[0081] The present application provides an electrical equipment, including an energy storage device 100, and the energy storage device 100 is used to supply power to the electrical equipment. The electrical equipment can include a user load 300 or a vehicle, an electronic device, a household appliance, etc.

[0082] Specifically, the energy storage device 100 includes an end cover assembly, an electrode assembly, and a housing. The electrode assembly is located in the space enclosed by the housing. The end cover 1 of the end cover assembly is connected to the housing and is used to close one side opening of the housing.

[0083] As Figures 2 to 5As shown in the figure, the end cap assembly provided by the embodiment of the present application includes an end cap 1 and a current collector plate 2. The end cap 1 has an explosion-proof valve 11 and a liquid injection hole 12, and the liquid injection hole 12 and the explosion-proof valve 11 are spaced apart. The current collector plate 2 is coaxially arranged with the end cap 1. The current collector plate 2 includes a main body portion 21. A groove 22 is formed on the surface of the main body portion 21 facing the end cap 1, and the groove 22 extends from the center of the main body portion 21 to the edge of the main body portion 21 along the radial direction of the main body portion 21. A visual recognition portion 25 is provided on the main body portion 21, and the visual recognition portion 25 has a visual recognition feature different from the area other than the visual recognition portion 25 on the main body portion 21.

[0084] Wherein, the liquid injection hole 12 is used to align the end cap 1 and the current collector plate 2 through the visual recognition portion 25, so that the explosion-proof valve 11 and the groove 22 are arranged opposite to each other along the axial direction of the current collector plate 2, and the overlapping area of the orthographic projection of the explosion-proof valve 11 on the current collector plate 2 and the groove 22 is greater than 30% of the orthographic projection area of the explosion-proof valve 11.

[0085] Exemplarily, the end cap assembly provided by the embodiment of the present application is used for a cylindrical battery. The cylindrical battery includes a housing and an electrode assembly. Both ends of the electrode assembly are respectively welded to a current collector plate 2. The end cap 1 is fixedly connected to the open end of the housing to enclose a sealed cavity. The electrode assembly is located in the sealed cavity. One of the current collector plates 2 is welded to the bottom of the housing, and the other current collector plate 2 is electrically connected to the pole post on the end cap 1. The current collector plate 2 provided by the embodiment of the present application can be a positive current collector plate or a negative current collector plate, and can be flexibly selected according to actual needs. For example, when the current collector plate 2 is made of aluminum, it can be used as a positive current collector plate and welded to the aluminum end cap 1.

[0086] As Figure 4 shown, the main body portion 21 of the current collector plate 2 can be in the shape of a circular flat plate, so that the current collector plate 2 can be adapted to the cross-sectional shape of the housing of the cylindrical battery, and thus can be widely applied to cylindrical batteries, which is beneficial to realizing the attachment between the wound electrode assembly and the current collector plate 2 and between the end cap 1 and the current collector plate 2, and ensuring the sealed connection between the current collector plate 2 and the housing of the cylindrical battery.

[0087] 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 the air pressure in the sealed cavity of the energy storage device 100 to increase sharply. 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 is likely to explode, resulting in a safety accident. By providing an explosion-proof valve 11 on the end cap 1, the gas in the sealed cavity of the energy storage device 100 can be discharged in time, reducing the safety risk. Exemplarily, the explosion-proof valve 11 is in the shape of a sheet, and a stress-weakened area is provided on the explosion-proof valve 11. When the pressure exerted on the explosion-proof valve 11 by the air pressure in the sealed cavity of the energy storage device 100 reaches the maximum pressure that the stress-weakened area can withstand, the stress-weakened area of the explosion-proof valve 11 will rupture, thereby discharging the large amount of gas in the sealed cavity and relieving the pressure of the sealed cavity in time.

[0088] The main body portion 21 has a first surface and a second surface disposed opposite to each other. Specifically, in the case where the end cap assembly is assembled to the energy storage device 100, the first surface is the surface on the side facing away from the electrode assembly, and the second surface of the main body portion 21 is the surface on the side facing the electrode assembly. The groove 22 is recessed in the main body portion 21, and the groove 22 extends in a strip shape from the central axis of the main body portion 21 towards the edge of the main body portion 21. Among them, the groove 22 is used to provide a welding space for the current collector plate 2 and the electrode assembly. The groove 22 is recessed with respect to the first surface, and the groove 22 extends in the radial direction of the main body portion 21. The groove 22 can be obtained by stamping the first surface of the main body portion 21, and a protrusion is formed on the second surface accordingly.

[0089] The liquid injection hole 12 is used to align the end cap 1 and the current collector plate 2 through the visual recognition portion 25 during the installation process of the end cap assembly. Since the visual recognition portion 25 is provided on the main body portion 21, and the visual recognition portion 25 has visual recognition features different from the regions other than the visual recognition portion 25 on the main body portion 21, the end cap 1 and the current collector plate 2 can be aligned based on the recognition, distinction or judgment of the visual recognition portion 25. Exemplarily, the surface of the current collector plate 2 can be visually recognized, distinguished or judged through the liquid injection hole 12, and the position of the explosion-proof valve 11 relative to the current collector plate 2 can be adjusted to ensure that the explosion-proof valve 11 and the groove 22 are axially opposite to each other along the current collector plate 2, and at least a part of the orthographic projection of the explosion-proof valve 11 on the current collector plate 2 is located in the groove 22. It can be understood that the orthographic projection of the explosion-proof valve 11 on the current collector plate 2 is the projection of the explosion-proof valve 11 along the direction parallel to the central axis of the current collector plate 2 and pointing from the end cap 1 to the current collector plate 2. As Figure 5As shown in the figure, when observed along the axial direction of the current collector plate 2, the explosion-proof valve 11 and the groove 22 at least partially overlap. When the energy storage device 100 is impacted due to reasons such as impact or drop, if the electrolyte infiltrating the electrode assembly generates a moving impact from the position where the electrode assembly is located towards the position where the explosion-proof valve 11 is located, the electrolyte will be blocked by the groove 22. The groove 22 bears part of the impact caused by the electrolyte, plays a buffering role for the explosion-proof valve 11, reduces the impact pressure on the explosion-proof valve 11 from the electrolyte, prevents the explosion-proof valve 11 from being accidentally triggered and broken under the impact of the electrolyte, is beneficial to improving the safety performance of the energy storage device 100, and extends the service life of the energy storage device 100.

[0090] As Figure 3 and Figure 4 As shown in the figure, an installation 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 current collector plate 2. The boss 24 is inserted into the installation hole 13 to realize the connection between the end cap 1 and the current collector plate 2. Optionally, the boss 24 is rotatably inserted into the installation hole 13, so that the end cap 1 and the current collector plate 2 can rotate relative to each other, facilitating the adjustment of the relative position of the explosion-proof valve 11 relative to the current collector plate 2.

[0091] The end cap assembly provided by the embodiment of the present application uses the visual recognition part 25 to align the end cap 1 and the current collector plate 2 by setting the liquid injection hole 12, which is convenient for accurately aligning the current collector plate 2 and the end cap 1 during the production and manufacturing process of the energy storage device 100, so that the explosion-proof valve 11 and the groove 22 are arranged opposite to each other along the axial direction of the current collector plate 2, and at least part of the orthographic projection of the explosion-proof valve 11 on the current collector plate 2 is located in the groove 22; when the energy storage device 100 is impacted, hit or dropped, the electrolyte inside the housing of the energy storage device 100 will impact towards the side where the current collector plate 2 and the end cap 1 are located. After being blocked and reflected by the groove 22, the flow direction of the electrolyte deflects, making it difficult for the electrolyte to directly impact the explosion-proof valve 11, reducing the pressure on the explosion-proof valve 11, and 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.

[0092] In a further embodiment, the overlapping area of the orthographic projection of the explosion-proof valve 11 on the current collector plate 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 blocking and reflecting 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.

[0093] In a specific embodiment, the visual recognition features of the visual recognition unit 25 include at least one of color, pattern, and transparency. It can be understood that color can include various color attributes such as hue, saturation, brightness, color level, and gray scale.

[0094] Exemplarily, the color of the visual recognition unit 25 is different from the color of the area on the main body 21 other than the visual recognition unit 25. For example, the visual recognition unit 25 is black, while the area on the main body 21 other than the visual recognition unit 25 is silver. When it is recognized and determined that the color of the area aligned with the liquid injection hole 12 is black, it can be determined that the area aligned with the liquid injection hole 12 is the visual recognition unit 25, and then the relative position of the explosion-proof valve 11 with respect to the manifold 2 can be determined, which is convenient for further adjusting the relative setting of the explosion-proof valve 11 and the groove 22 along the axial direction of the manifold 2 to complete the positioning of the end cap 1 and the manifold 2.

[0095] Exemplarily, the pattern of the visual recognition unit 25 is different from the pattern of the area on the main body 21 other than the visual recognition unit 25. For example, the visual recognition area is provided with a stripe pattern, while the area on the main body 21 other than the visual recognition unit 25 is not provided with a pattern or is provided with a pattern of other shapes. When it is recognized and determined that the area aligned with the liquid injection hole 12 has a stripe pattern, it can be determined that the area aligned with the liquid injection hole 12 is the visual recognition unit 25, and then the relative position of the explosion-proof valve 11 with respect to the manifold 2 can be determined, which is convenient for further adjusting the relative setting of the explosion-proof valve 11 and the groove 22 along the axial direction of the manifold 2 to complete the positioning of the end cap 1 and the manifold 2.

[0096] Exemplarily, the transparency of the visual recognition unit 25 is different from the transparency of the area on the main body 21 other than the visual recognition unit 25. For example, the visual recognition area is a transparent or semi-transparent structure, while the area on the main body 21 other than the visual recognition unit 25 is an opaque structure. When it is recognized and determined that the area aligned with the liquid injection hole 12 is a transparent or semi-transparent structure, it can be determined that the area aligned with the liquid injection hole 12 is the visual recognition unit 25, and then the relative position of the explosion-proof valve 11 with respect to the manifold 2 can be determined, which is convenient for further adjusting the relative setting of the explosion-proof valve 11 and the groove 22 along the axial direction of the manifold 2 to complete the positioning of the end cap 1 and the manifold 2.

[0097] In one embodiment, the visual recognition part 25 includes a first anti-reflection layer coated with a black anti-reflection coating. The function of the first anti-reflection layer is as follows: When welding directly on the first anti-reflection layer, laser reflection can be avoided, which affects the welding effect. By providing the first anti-reflection layer, not only can laser reflection be avoided during laser welding of the current collector plate 2 and the electrode assembly, but the first anti-reflection layer can also be used as a visual recognition feature, eliminating the need for additional processing of the visual recognition part 25, which helps save coating costs and improve the process cycle time and efficiency. It can be understood that in this embodiment, the area outside the visual recognition part 25 is a color other than black, such as silver.

[0098] In one embodiment, the deflection angle of the groove 22 relative to the visual recognition part 25 is the same as the deflection angle of the explosion-proof valve 11 relative to the liquid injection hole 12. When the liquid injection hole 12 and the visual recognition part 25 are axially opposite to each other with respect to the current collector plate 2, the explosion-proof valve 11 and the groove 22 are axially opposite to each other along the current collector plate 2, and the overlapping area of the orthographic projection of the explosion-proof valve 11 on the current collector plate 2 and the groove 22 is greater than 30% of the orthographic projection area of the explosion-proof valve 11. It can be understood that the deflection angle of the groove 22 relative to the visual recognition area is the angle between the line connecting the center of the groove 22 set and the central axis of the current collector plate 2 and the line connecting the geometric center of the visual recognition area and the central axis of the current collector plate 2, and the deflection angle of the explosion-proof valve 11 relative to the liquid 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 liquid 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 visual recognition part 25 is the same as the deflection angle of the explosion-proof valve 11 relative to the liquid injection hole 12, that is, the deflection direction of the groove 22 relative to the visual recognition part 25 is the same as the deflection direction of the explosion-proof valve 11 relative to the liquid injection hole 12, and the deflection angle of the groove 22 relative to the visual recognition part 25 is the same as the deflection angle of the explosion-proof valve 11 relative to the liquid injection hole 12. Among them, both the groove 22 and the visual recognition part 25 can be one or more. When both the groove 22 and the visual recognition part 25 are multiple, aligning the liquid injection hole 12 with any one of the visual recognition parts 25 can complete the alignment of the end cap 1 and the current collector plate 2, reducing the installation and positioning difficulty of the end cap assembly and facilitating the improvement of the production efficiency of the end cap assembly.

[0099] By setting the deflection angle of the groove 22 relative to the visual recognition part 25 to be the same as the deflection angle of the explosion-proof valve 11 relative to the liquid injection hole 12, during the process of aligning the end cap assembly through the liquid injection hole 12, only by aligning the liquid injection hole 12 with the visual recognition part 25 and making the liquid injection hole 12 and the visual recognition part 25 axially opposite to each other along the current collector plate 2, the positions of the explosion-proof valve 11 and the groove 22 can be aligned, and the explosion-proof valve 11 and the groove 22 can be axially opposite to each other along the current collector plate 2, reducing the installation and positioning difficulty of the end cap assembly and facilitating the rapid alignment of the end cap 1 and the current collector plate 2.

[0100] In one embodiment, the number of the visual recognition parts 25 and the grooves 22 is multiple, and the multiple visual recognition parts 25 and the multiple grooves 22 are alternately distributed one by one on the main body part 21. Specifically, the multiple grooves 22 are distributed at intervals along the circumferential direction of the main body part 21, and one visual recognition part 25 is arranged between any two adjacent grooves 22. For example Figure 5 As shown, the number of the grooves 22 and the visual recognition parts 25 is three each, and the three grooves 22 and the three visual recognition parts 25 are alternately distributed one by one on the main body part 21. By providing the multiple grooves 22, multiple welding positions are provided for the current collecting plate 2 and the electrode assembly, ensuring the stability and reliability of the connection between the current collecting plate 2 and the electrode assembly; by providing that the main body part 21 is provided with multiple visual recognition parts 25, during the installation process of the end cover assembly, the alignment of the current collecting plate 2 of the end cover 1 can be completed by using one of the visual recognition parts 25, reducing the difficulty of aligning the end cover 1 and the current collecting plate 2 through the visual recognition part 25, which is beneficial to improving the alignment and installation efficiency of the end cover assembly.

[0101] Furthermore, among the multiple visual recognition parts 25, at least two visual recognition parts 25 have different visual recognition features. Among them, the different visual recognition features can be manifested as different forms of the same type of visual recognition feature. For example, the color of one recognition part is black, and the colors of other recognition parts are red; the different visual recognition features can also be manifested as having different types of visual recognition features. For example, the color of one visual recognition part 25 is black, and the other visual recognition parts 25 are semi-transparent or transparent structures.

[0102] By providing that at least two visual recognition parts 25 have different visual recognition features, it is beneficial to distinguish the multiple visual recognition parts 25, and it is convenient to adjust the position of the explosion-proof valve 11 relative to the current collecting plate 2 according to different visual recognition parts 25, so as to realize the positioning of the end cover 1 and the current collecting plate 2, and prevent the explosion-proof valve 11 from being accidentally triggered by the impact of the electrolyte.

[0103] In a specific embodiment, the liquid injection hole 12 and the explosion-proof valve 11 are distributed along the radial direction of the end cover 1, and any groove 22 is disposed opposite to a visual recognition part 25 along the radial direction of the current collecting plate 2. As Figure 3 shown, the connection line between the liquid injection hole 12 and the central axis of the end cover 1 and the connection line between the explosion-proof valve 11 and the central axis of the end cover 1 are on the same straight line, and the included angle between the liquid injection hole 12 and the explosion-proof valve 11 is 180°. As Figure 4As shown, there are three grooves 22 and three visual recognition parts 25. The three grooves 22 and the three visual recognition parts 25 are evenly distributed on the main body part 21 respectively, and the three grooves 22 and the three visual recognition parts 25 are alternately distributed one by one on the main body part 21. Any one groove 22 is arranged opposite to one of the visual recognition parts 25 along the radial direction of the current collecting plate 2. In this embodiment, when the liquid injection hole 12 is aligned with any one of the visual recognition parts 25, the explosion-proof valve 11 can be arranged opposite to one of the grooves 22 along the axial direction of the current collecting plate 2, reducing the installation and positioning difficulty of the end cover assembly and facilitating the quick alignment of the end cover 1 and the current collecting plate 2.

[0104] In an alternative embodiment, the shape of the visual recognition part 25 is adapted to the shape of the liquid injection hole 12. For example, when the liquid injection hole 12 is a circular hole, the visual recognition part 25 is also circular. By setting the shape of the visual recognition part 25 to be adapted to the shape of the liquid injection hole 12, it is beneficial to distinguish the visual recognition part 25 from other areas on the main body part 21 during the alignment process and quickly identify the visual recognition part 25, improving the alignment efficiency of the end cover 1 and the current collecting plate 2.

[0105] Furthermore, the orthographic projection area of the liquid injection hole 12 on the current collecting plate 2 is smaller than the area of the visual recognition part 25, and the ratio of the orthographic projection area of the liquid injection hole 12 on the current collecting plate 2 to the area of the visual recognition part 25 is 0.51 - 0.98, so that the visual recognition part 25 can be quickly and effectively recognized when the current collecting plate 2 is recognized through the liquid injection hole 12, which is beneficial to quickly complete the alignment of the end cover 1 and the current collecting plate 2.

[0106] In an embodiment, a second anti-reflection layer is provided on the surface of the end cover 1 close to the current collecting plate 2 to prevent the recognition effect of the visual recognition part 25 from being affected by the reflection on the surface of the end cover 1. Specifically, the second anti-reflection layer can be a titanium carbonitride coating, silicone rubber or silicone-based coating, which can not only prevent reflection, but also avoid the generation of scratch debris due to the contact between the end cover 1 and the housing of the energy storage device 100, thus causing a short-circuit problem. At the same time, the electrolyte will not corrode the second anti-reflection layer, and the failure of the second anti-reflection layer can be avoided. Optionally, the color of the second anti-reflection layer is black to further enhance the anti-reflection effect.

[0107] The main body part 21 is also provided with a vent hole area 23, and the vent hole area 23 includes a plurality of through holes 231 arranged at intervals. The visual recognition part 25 is located in the vent hole area 23. The through holes 231 penetrate the thickness direction of the main body part 21. By providing the vent hole area 23, the gas pressure relief channel is increased, which is beneficial to discharging the gas when the electrode assembly gets out of control, ensuring the gas volume required for the normal opening of the explosion-proof valve 11, and thus timely discharging the gas through the explosion-proof valve 11 to prevent the internal air pressure of the energy storage device 100 from being too high, which is beneficial to improving the safety and reliability of the energy storage device 100.

[0108] A plurality of through holes 231 can be arranged in an array on the main body portion 21, improving the uniformity and timeliness of the pressure relief of the gas pressure relief channel. For example, the plurality of through holes 231 are arranged in a ring shape on the main body portion 21; or, the plurality of through holes 231 are arranged in rows along the radial direction of the main body portion 21 on the main body portion 21. In a specific embodiment, as Figure 4 shown, the breathable hole area 23 includes eight through holes 231, and the eight through holes 231 are arranged in a quasi-rectangular array.

[0109] Optionally, the inner diameter of the through hole 231 is larger than the inner diameter of the liquid injection hole 12. During the process of injecting liquid into the electrode assembly through the liquid injection hole 12, the liquid injection hole 12 can be coaxially aligned with one of the through holes 231, and the electrolyte can be directly passed through the current collector plate 2 into the electrode assembly, improving the liquid injection efficiency.

[0110] Furthermore, the distance between each through hole 231 and the central axis of the current collector plate 2 is less than the distance between the liquid injection hole 12 and the central axis of the end cap 1, so that the orthographic projection of the liquid injection hole 12 on the current collector plate 2 does not overlap with the through hole 231, preventing the through hole 231 from affecting the recognition effect of the visual recognition portion 25 during the positioning process through the liquid injection hole 12.

[0111] Optionally, the shape of the visual recognition portion 25 is different from the shape of the through hole 231. For example, when the through hole 231 is a circular hole, the visual recognition portion 25 has a shape different from a circle, such as an oval or a rectangle. By setting the shape of the visual recognition portion 25 to be different from the shape of the through hole 231, it is beneficial to distinguish the visual recognition portion 25 from the through hole 231 during the alignment process and quickly recognize the visual recognition portion 25, improving the alignment efficiency of the end cap 1 and the current collector plate 2.

[0112] Furthermore, the area of the visual recognition portion 25 is larger than the opening area of each through hole 231, and the ratio of the area of the visual recognition portion 25 to the opening area of the through hole 231 is 1.05 to 1.76, facilitating the quick recognition of the visual recognition portion 25 and improving the alignment efficiency of the end cap 1 and the current collector plate 2. It should be noted that the opening area of the through hole 231 is the area of the through hole 231 on the surface of the current collector plate 2 facing the end cap 1.

[0113] The present application also provides a method for installing and positioning an end cap assembly, which is applied to the end cap assembly provided in any of the above embodiments, as Figure 6 shown, the method includes:

[0114] S10: Adjust the position of the explosion-proof valve 11 relative to the current collector plate 2 according to the visual recognition portion 25, and determine that the explosion-proof valve 11 and the groove 22 are oppositely arranged along the axial direction of the current collector plate 2.

[0115] The end cover assembly includes an end cover 1 and a current collecting plate 2. The end cover 1 has an explosion-proof valve 11 and a liquid injection hole 12, and the liquid injection hole 12 is spaced apart from the explosion-proof valve 11. The current collecting plate 2 is coaxially arranged with the end cover 1, and the current collecting plate 2 includes a main body 21, and a groove 22 is provided on the surface of the main body 21 facing the end cover 1, and the groove 22 extends from the center of the main body 21 to the edge of the main body 21 along the radial direction of the main body 21. A visual identification part 25 is provided on the main body 21, and the visual identification part 25 has a visual identification feature different from that of the area outside the visual identification part 25 on the main body 21. Among them, the liquid injection hole 12 is used to align the end cover 1 and the current collecting plate 2 through the visual identification part 25, so that the explosion-proof valve 11 and the groove 22 are arranged opposite to each other along the axial direction of the current collecting plate 2, and the overlapping area of the orthographic projection of the explosion-proof valve 11 on the current collecting plate 2 and the groove 22 is greater than 30% of the orthographic projection area of the explosion-proof valve 11.

[0116] In step S10, based on the recognition of the visual recognition part 25 by the recognition device, the position of the explosion-proof valve 11 relative to the collecting 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 collecting plate 2 is adjusted until the explosion-proof valve 11 and the groove 22 are arranged relative to each other along the axial direction of the collecting plate 2. At this time, the orthographic projection of the explosion-proof valve 11 on the collecting plate 2 is at least partially located on the groove 22. When the energy storage device 100 is impacted by collision, falling, etc., if the electrolyte infiltrated in the electrode assembly generates a movement impact 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 of the explosion-proof valve 11 from the electrolyte, and prevents the explosion-proof valve 11 from being mistakenly triggered and broken under 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. The recognition device may be a camera, a photosensitive sensor, a scanner or other device used to recognize or scan visual recognition features.

[0117] Exemplarily, the driving device is in transmission connection with the end cover 1 and the identification device, and the driving device drives the end cover 1 to rotate around its own central axis to adjust the position of the explosion-proof valve 11 relative to the collecting plate 2. It can be understood that the identification device moves synchronously with the end cover 1, so that the identification device always identifies and judges the collecting plate 2 through the injection hole 12.

[0118] The end - cover assembly installation and positioning method provided by the embodiment of the present application adjusts the position of the explosion - proof valve 11 relative to the current - collecting plate 2 based on the vision recognition part 25, and determines that the explosion - proof valve 11 and the groove 22 are arranged axially relative to each other along the current - collecting 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 towards the side where the current - collecting plate 2 and the end - cover 1 are located. After being blocked and reflected by the groove 22, the flow direction of the electrolyte deflects, so that the electrolyte is not likely to directly impact the explosion - proof valve 11, reducing the pressure on the explosion - proof valve 11 and lowering 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.

[0119] In a further embodiment, the deflection angle of the groove 22 relative to the vision recognition part 25 is the same as the deflection angle of the explosion - proof valve 11 relative to the liquid injection hole 12. Determining that the explosion - proof valve 11 and the groove 22 are arranged axially relative to each other along the current - collecting plate 2 in step S10 specifically includes:

[0120] Determine that the liquid injection hole 12 is aligned with the vision recognition part 25.

[0121] Since the deflection angle of the groove 22 relative to the vision recognition part 25 is the same as the deflection angle of the explosion - proof valve 11 relative to the liquid injection hole 12, during the process of aligning the end - cover assembly through the liquid injection hole 12, only need to align the liquid injection hole 12 with the vision recognition part 25, so that the liquid injection hole 12 and the vision recognition part 25 are arranged axially relative to each other along the current - collecting plate 2, then the positions of the explosion - proof valve 11 and the groove 22 can be aligned, making the explosion - proof valve 11 and the groove 22 arranged axially relative to each other along the current - collecting plate 2, reducing the installation and positioning difficulty of the end - cover assembly and being beneficial to quickly completing the alignment of the end - cover 1 and the current - collecting plate 2.

[0122] The vision recognition features of the vision recognition part 25 include at least one of color, pattern, and transparency. Determining that the liquid injection hole 12 is aligned with the vision recognition part 25 specifically includes:

[0123] Determine that the vision recognition feature of the area aligned with the liquid injection hole 12 is the vision recognition feature of the vision recognition part 25.

[0124] In a specific embodiment, the vision recognition feature includes a color parameter, and the color parameter of the vision recognition part 25 is different from the color parameter of the area other than the vision recognition part 25 on the main body part 21.

[0125] It can be understood that the color parameters may include various parameters such as hue, saturation, brightness, color level, grayscale, etc. The recognition device can perform color recognition on the current collector plate 2 through the liquid injection hole 12. Since the color parameters of the visual recognition part 25 are different from those of the area other than the visual recognition part 25 on the main body part 21, the recognition device can distinguish the visual recognition part 25 from other areas and determine whether the color parameters of the area aligned with the liquid injection hole 12 are the color parameters of the visual recognition part 25. After determining that the color parameters of the area aligned with the liquid injection hole 12 are the color parameters of the visual recognition part 25, the position adjustment of the end cover 1 is stopped, so that the explosion-proof valve 11 and the groove 22 are arranged opposite to each other along the axial direction of the current collector plate 2, and the alignment of the end cover 1 and the current collector plate 2 is completed.

[0126] Furthermore, the color parameters include weighted RGB values. The weighted RGB value of the visual recognition part 25 is greater than the preset weighted RGB value, and the preset RGB value of the area other than the visual recognition part 25 on the main body part 21 is less than the preset weighted RGB value. Determining that the visual recognition feature of the area aligned with the liquid injection hole 12 is the visual recognition feature of the visual recognition part 25 includes:

[0127] Obtain the weighted RGB value of the area aligned with the liquid injection hole 12;

[0128] Determine that the weighted RGB value of the area aligned with the liquid injection hole 12 is greater than the preset weighted RGB value.

[0129] In this embodiment, the visual recognition part 25 is dark in color, and the area other than the visual recognition part 25 on the main body part 21 is light in color. The weighted RGB value of the visual recognition part 25 is greater than the weighted RGB value of the area other than the visual recognition part 25 on the main body part 21. When the recognition device recognizes that the weighted RGB value of the area aligned with the liquid injection hole 12 is greater than the preset weighted RGB value, it can be confirmed that the area aligned with the liquid injection hole 12 is the visual recognition part 25. At this time, the position adjustment of the end cover 1 is stopped, so that the explosion-proof valve 11 and the groove 22 are arranged opposite to each other along the axial direction of the current collector plate 2, and the alignment of the end cover 1 and the current collector plate 2 is completed.

[0130] Specifically, the weighted RGB value satisfies the following color parameter relationship formula:

[0131] M = aR + bG + cB;

[0132] where M is the weighted RGB value, a is the first weighting coefficient, b is the second weighting coefficient, c is the third weighting coefficient, R is the red component, G is the green component, and B is the blue component. Obtaining the weighted RGB value of the area aligned with the liquid injection hole 12 specifically includes:

[0133] Obtain the red component, green component, and blue component of the area aligned with the liquid injection hole 12;

[0134] According to the color parameter relationship formula, the weighted RGB value of the area aligned with the liquid injection hole 12 is obtained.

[0135] In this embodiment, the red component, green component, and blue component of the area aligned with the liquid injection hole 12 are obtained through the recognition device, and based on the color parameter relationship formula, the weighted RGB value of the area aligned with the liquid injection hole 12 is calculated, which is convenient for further determining whether the area aligned with the liquid injection hole 12 is the visual recognition part 25. Among them, the first weighting coefficient, the second weighting coefficient, and the third weighting coefficient are preset coefficients. In a specific embodiment, the first weighting coefficient a is 0.299, the second weighting coefficient b is 0.587, the third weighting coefficient is 0.114, the preset weighted RGB value is 192. When the weighted RGB value M of the area aligned with the liquid injection hole 12 is greater than 192, it can be determined that the area aligned with the liquid injection hole 12 is the visual recognition part 25.

[0136] In the description of this specification, the description with reference to terms such as "embodiment", "specific embodiment", "example" or "specific example" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0137] The above-disclosed is only a preferred embodiment of the present application. Of course, it cannot be used to limit the scope of rights of the present application. Those of ordinary skill in the art can understand the whole or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. An end cap assembly, characterized in that, Comprising: An end cap (1), having an explosion-proof valve (11) and a liquid injection hole (12), the liquid injection hole (12) and the explosion-proof valve (11) being spaced apart; A current collector plate (2), coaxially arranged with the end cap (1), the current collector plate (2) including a main body portion (21), a groove (22) being formed on the surface of the main body portion (21) facing the end cap (1), the groove (22) extending along the radial direction of the main body portion (21) from the center of the main body portion (21) towards the edge of the main body portion (21), a visual recognition portion (25) being provided on the main body portion (21), the visual recognition portion (25) having a visual recognition feature different from the area other than the visual recognition portion (25) on the main body portion (21); Wherein, the liquid injection hole (12) is used to align the end cap (1) and the current collector plate (2) through the visual recognition portion (25), so that the explosion-proof valve (11) and the groove (22) are arranged opposite to each other along the axial direction of the current collector plate (2), and the overlapping area of the orthographic projection of the explosion-proof valve (11) on the current collector plate (2) and the groove (22) is greater than or equal to 30% of the orthographic projection area of the explosion-proof valve (11).

2. The end cap assembly according to claim 1, wherein, The visual recognition feature of the visual recognition portion (25) includes at least one of color, pattern, and transparency.

3. The end cap assembly according to claim 2, characterized in that, The visual recognition portion includes a first anti-reflection layer coated with a black anti-reflection coating.

4. The end cap assembly according to any one of claims 1 to 3, characterized in that The deflection angle of the groove (22) relative to the visual recognition portion (25) is the same as the deflection angle of the explosion-proof valve (11) relative to the liquid injection hole (12); When the liquid injection hole (12) and the visual recognition portion (25) are arranged opposite to each other along the axial direction of the current collector plate (2), the explosion-proof valve (11) and the groove (22) are arranged opposite to each other along the axial direction of the current collector plate (2), and the overlapping area of the orthographic projection of the explosion-proof valve (11) on the current collector plate (2) and the groove (22) is greater than 30% of the orthographic projection area of the explosion-proof valve (11).

5. The end cap assembly according to any one of claims 1 to 3, characterized in that The number of the visual recognition portions (25) and the grooves (22) is multiple, and the multiple visual recognition portions (25) and the multiple grooves (22) are alternately distributed one by one on the main body portion (21).

6. The end cap assembly according to claim 5, wherein, The visual recognition features of at least two of the visual recognition portions (25) are different.

7. The end cap assembly according to claim 5, characterized in that, The liquid injection hole (12) and the explosion-proof valve (11) are distributed along the radial direction of the end cap (1), and any one of the grooves (22) is arranged opposite to one of the visual recognition portions (25) along the radial direction of the current collector plate (2).

8. The end cap assembly according to claim 1, wherein, The shape of the visual recognition portion (25) is adapted to the shape of the liquid injection hole (12).

9. The end cap assembly according to claim 8, characterized in that, The orthographic projection area of the liquid injection hole (12) on the current collector plate (2) is smaller than the area of the visual recognition portion (25), and the ratio of the orthographic projection area of the liquid injection hole (12) on the current collector plate (2) to the area of the visual recognition portion (25) is 0.51 - 0.

98.

10. The end cap assembly according to claim 1, wherein, A second anti-reflection layer is provided on the surface of the end cap (1) close to the current collector plate (2).

11. The end cap assembly according to claim 1, characterized in that, The main body part (21) is further provided with a ventilation hole area (23), the ventilation hole area (23) includes a plurality of through holes (231) arranged at intervals, and the visual recognition part (25) is located within the ventilation hole area (23).

12. The end cap assembly according to claim 11, wherein The distance between each through hole (231) and the central axis of the current collecting plate (2) is less than the distance between the liquid injection hole (12) and the central axis of the end cover (1).

13. The end cap assembly according to claim 11, characterized in that, The shape of the visual recognition part (25) is different from the shape of the through hole (231).

14. The end cap assembly according to claim 13, wherein, The area of the visual recognition part (25) is larger than the opening area of each through hole (231), and the ratio of the area of the visual recognition part to the opening area of the through hole is 1.05 - 1.

76.

15. 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 current collecting plate (2) and the groove (22) is greater than 80% of the orthographic projection area of the explosion-proof valve (11).

16. An energy storage device, characterized in that, Comprising the end cover assembly according to any one of claims 1 to 15.

17. A positioning method for an end cover assembly, applied to the end cover assembly according to any one of claims 1 to 15, characterized in that, The method for positioning the end cover assembly includes: Adjusting the position of the explosion-proof valve relative to the current collecting plate according to the visual recognition feature of the visual recognition part, and determining that the explosion-proof valve and the groove are arranged opposite to each other along the axial direction of the current collecting plate.

18. The positioning method of the end cover assembly according to claim 17, characterized in that, The deflection angle of the groove relative to the visual recognition part is the same as the deflection angle of the explosion-proof valve relative to the liquid injection hole; The determining that the explosion-proof valve and the groove are arranged opposite to each other along the axial direction of the current collecting plate specifically includes: Determining that the liquid injection hole is aligned with the visual recognition part.

19. The method for positioning the end cover assembly according to claim 18, wherein, The visual recognition feature includes at least one of color, pattern, and transparency; The determining that the liquid injection hole is aligned with the visual recognition part specifically includes: Determining that the visual recognition feature of the area aligned with the liquid injection hole is the visual recognition feature of the visual recognition part.

20. The method for positioning an end cover assembly according to claim 19, wherein The visual recognition feature includes a color parameter, the color parameter includes a weighted RGB value, the weighted RGB value of the visual recognition part is greater than a preset weighted RGB value, and the preset RGB value of the area other than the visual recognition part on the main body part is less than the preset weighted RGB value; The determining that the visual recognition feature of the area aligned with the liquid injection hole is the visual recognition feature of the visual recognition part includes: Obtaining the weighted RGB value of the area aligned with the liquid injection hole; Determining that the weighted RGB value of the area aligned with the liquid injection hole is greater than the preset weighted RGB value.

21. The positioning method of the end cap assembly according to claim 20, wherein, The weighted RGB value satisfies the following color parameter relation formula: M = aR + bG + cB; Wherein, M is the weighted RGB value, a is the first weighting coefficient, b is the second weighting coefficient, c is the third weighting coefficient, R is the red component, G is the green component, and B is the blue component; The obtaining the weighted RGB value of the area aligned with the liquid injection hole specifically includes: Obtaining the red component, the green component, and the blue component of the area aligned with the liquid injection hole; According to the color parameter relation formula, obtaining the weighted RGB value of the area aligned with the liquid injection hole.

Images