An energy storage device and an electrical equipment

Abstract

The present application relates to an energy storage device and an electrical equipment. The energy storage device comprises an end cap assembly, an adapter and an electrode assembly, the end cap assembly comprises a top cap, a pole and a partitioning component, the top cap has a first surface and a second surface and is penetrated by a liquid injection hole, the partitioning component is located on the second surface side, the liquid collecting cavity is recessed in the surface of the partitioning component facing the top cap, the first liquid discharge hole penetrates the bottom wall of the liquid collecting cavity, and the orthographic projection of the liquid injection hole on the second surface is within the range of the orthographic projection of the liquid collecting cavity on the second surface; the adapter comprises a disc body and an adapter; the guide groove is a spiral structure and is located on the surface of the disc body facing the top cap, the second liquid discharge hole is connected to the guide groove and is located at the center of the disc body, and the orthographic projection of the first liquid discharge hole on the surface of the disc body facing the top cap falls within the range of the guide groove; the electrode assembly is wound in a hollow structure, and the orthographic projection of the second liquid discharge hole on the surface of the electrode assembly facing the top cap falls within the range of the hollow structure. The disc body of the energy storage device can improve the electrolyte injection effect.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and particularly relates to an energy storage device and an electrical equipment. Background Art

[0002] With the continuous development of secondary batteries, people have higher and higher requirements for their various performances, especially for the battery cycle performance. And the liquid injection effect of the electrolyte is an important factor affecting the battery cycle performance. Generally, the secondary battery is filled with electrolyte through a liquid injection hole provided on the end cap assembly. The electrolyte successively passes through the partition member and the adapter and penetrates into the tab and the electrode sheet. Then, the electrolyte diffuses and infiltrates along the electrode sheet and the separator. The liquid injection hole of the secondary battery is generally arranged at a position near the side of the end cap assembly. When filling the electrolyte through the liquid injection hole, the electrolyte will pass through the partition member and the adapter and directly infiltrate to the edge position of the electrode assembly, resulting in that the electrolyte cannot diffuse from the center of the electrode assembly to the periphery, leading to uneven liquid injection of the electrolyte, poor liquid injection effect of the electrolyte, and then reducing the cycle performance of the battery. Summary of the Invention

[0003] In view of this, the present application provides an energy storage device and an electrical equipment. The disk body part of the energy storage device has a diversion groove, which is beneficial to improving the liquid injection effect of the electrolyte and improving the cycle performance of the battery.

[0004] The present application provides an energy storage device, which includes an end cover assembly, an adapter and an electrode assembly, wherein the end cover assembly includes a top cover, a pole and a partition component, wherein the top cover includes a first surface and a second surface arranged opposite to each other, the top cover has a liquid injection hole penetrating the first surface and the second surface, the partition component is arranged on one side of the second surface of the top cover, the pole sequentially penetrates the partition component and the top cover, and is convexly arranged on the first surface, the partition component has a liquid collecting cavity, the liquid collecting cavity is recessed in the surface of the partition component facing the top cover, the partition component also has one or more first liquid drain holes, the one or more first liquid drain holes penetrate the bottom wall of the liquid collecting cavity, and the orthographic projection of the liquid injection hole on the second surface falls within the range of the orthographic projection of the liquid collecting cavity on the second surface; the adapter is arranged on the partition The component is on the side away from the top cover, the adapter includes a bent and connected disk body and an adapter, the adapter is electrically connected to the end cover assembly, and is arranged on the side of the disk body close to the top cover; the disk body has a guide groove, the guide groove is located on the surface of the disk body facing the top cover, the guide groove is a spiral structure, the disk body also has a second liquid discharge hole connected to the guide groove, the second liquid discharge hole is at least partially located at the center of the disk body, and the first liquid discharge hole is at least partially within the range of the guide groove on the surface of the disk body facing the top cover; the electrode assembly is electrically connected to one end of the disk body away from the adapter, the electrode assembly is in a wound state and forms a hollow structure, and the second liquid discharge hole is within the range of the hollow structure on the surface of the electrode assembly facing the end cover assembly.

[0005] Furthermore, the orthographic projection of the first liquid outlet hole on the second surface at least partially overlaps with the orthographic projection of the liquid injection hole on the second surface;

[0006] Furthermore, an orthographic projection of the first liquid discharge hole on the second surface and an orthographic projection of the second liquid discharge hole on the second surface are staggered.

[0007] Further, when the partition component has a plurality of first liquid holes, the plurality of first liquid holes are arranged at intervals, and along a direction parallel to the radial direction of the disc body, the distance between the two farthest points on the area enclosed by the orthographic projection of any two of the first liquid holes on the second surface is H1, and the line width of the guide groove is H2, then the line width H2 of the guide groove satisfies the range: 0.5mm≤H2-H1≤2mm.

[0008] Further, along a direction parallel to the radial direction of the disc body, the distance between the two closest points of any two of the first liquid holes in the area surrounded by the orthographic projection of the second surface is H3, and 0.3H2≤H3≤0.5H2 is satisfied.

[0009] Furthermore, the sum of the orthographic projection areas of the multiple first liquid holes on the second surface is S1, and the overlapping area of ​​the orthographic projections of the multiple first liquid holes on the second surface and the orthographic projections of the guide grooves on the second surface is S2, then the relationship is satisfied: 0.4≤S2 / S1≤1.

[0010] Further, the disc body portion includes a main body portion, and the main body portion includes a first portion and a second portion that are connected, the surface of the first portion facing the top cover is recessed in the surface of the second portion facing the top cover, and the surface of the first portion facing the top cover is arranged farther away from the top cover than the surface of the second portion facing the top cover to form a guide groove; the surface of the first portion facing away from the top cover protrudes from the surface of the second portion facing away from the top cover.

[0011] Furthermore, the disk body also includes a first boss, which is arranged around the outer circumference of the main body and protrudes from the surface of the second part facing the top cover. The first boss has a first notch, and the portion of the disk body connected to the adapter is arranged adjacent to the first notch.

[0012] Further, the partition component includes a partition body portion and a second boss, the partition body portion having a liquid collecting chamber, the liquid collecting chamber being recessed in the surface of the partition body portion facing the top cover, the second boss being arranged on the surface of the partition body portion facing away from the top cover, and being arranged around the outer circumference of the partition body portion, the second boss having a second notch, and the portion where the disk body portion and the adapter portion are connected being arranged adjacent to the second notch; the partition body portion and the second boss enclose a accommodating groove, the accommodating groove being used to accommodate the disk body portion and the adapter portion, wherein the surface of the second boss facing away from the top cover is flush with the surface of the second portion facing away from the top cover, and the surface of the first boss facing the top cover abuts against the surface of the partition body portion facing away from the top cover.

[0013] Furthermore, the accommodating groove includes a first accommodating sub-groove and a second accommodating sub-groove which are connected to each other, the first accommodating sub-groove is arranged on a side of the second accommodating sub-groove close to the top cover, the first accommodating sub-groove is used to accommodate the adapter part, and the second accommodating sub-groove is used to accommodate the disk body part.

[0014] Furthermore, the disc body includes a main body, and the disc body also includes a guide convex ring, which is arranged on a surface of the main body away from the top cover and protrudes in a direction away from the top cover, and the guide convex ring is arranged around the outer periphery of the second liquid outlet hole.

[0015] Further, the flow guiding convex ring has a connected inner peripheral side wall and an end face. In the thickness direction of the energy storage device, the end face is the surface of the flow guiding convex ring facing away from the top cover, and the connection between the inner peripheral side wall and the end face has an arc chamfer.

[0016] Further, the energy storage device further includes a housing. The housing is disposed on one side of the end cover assembly and is connected to the housing. The housing has a receiving cavity for receiving the electrode assembly, and at least a part of the flow guiding convex ring is inserted into the hollow structure.

[0017] The present application also provides an electrical device, which includes a device body and the energy storage device provided by the present application, and the energy storage device supplies power to the device body.

[0018] In the energy storage device provided in the present application, the disc body has a guide groove and the guide groove is a spiral structure, the guide groove is connected to the second liquid flow hole, the spiral structure is conducive to reducing the flow resistance of the electrolyte in the guide groove, so that the electrolyte can flow smoothly to the second liquid flow hole and infiltrate the electrode assembly; and when the electrolyte drips on the surface of the disc body facing the top cover, the guide groove guides and gathers the electrolyte, and the guide groove provides a buffer channel for the electrolyte to avoid the electrolyte directly dripping to the electrode assembly and causing splashing or uneven infiltration. When the electrolyte is injected from the injection hole of the top cover, the electrolyte is first stored in the liquid collecting cavity of the partition component, and then flows out of the liquid collecting cavity through the first liquid flow hole set on the bottom wall of the liquid collecting cavity. The electrolyte drips in the guide groove and flows to the second liquid flow hole under the guidance of the guide groove. The guide groove is conducive to guiding the flow direction of the electrolyte, quickly gathering the electrolyte in the energy storage device, and improving the injection efficiency of the electrolyte. In addition, after the energy storage device has been used for a long time, the hollow structure of the electrode assembly has a higher temperature, which in turn increases the migration speed of active ions in the electrolyte located in the hollow structure of the electrode assembly, and also increases the side reactions, so that the electrolyte in the hollow structure of the electrode assembly is consumed faster. The guide groove is connected to the second liquid drain hole, and the second liquid drain hole is at least partially located in the center of the disk body, and the orthographic projection of the second liquid drain hole on the surface of the electrode assembly facing the end cover assembly falls within the range of the hollow structure. Then, the guide groove will collect the electrolyte dripping on the surface of the disk body facing the top cover, and guide it to the second liquid drain hole arranged near the center of the disk body, so that the electrolyte infiltrates the electrode assembly from the second liquid drain hole, that is, the electrolyte will directly infiltrate the hollow structure of the electrode assembly, which is conducive to ensuring the sufficiency of the electrolyte in the hollow structure of the electrode assembly, and then improve the cycle life of the battery. Furthermore, the guide groove gathers the electrolyte and guides it to the second liquid drain hole. When the electrolyte directly infiltrates the hollow structure of the electrode assembly, the electrolyte will diffuse from the hollow structure of the electrode assembly to the surroundings, so that the electrode assembly has a uniform liquid injection effect in all directions, which enhances the uniformity of the electrolyte in the electrode assembly and is conducive to improving the performance of the energy storage device. Furthermore, the second liquid drain hole is at least partially located at the center of the disk body, so that when the adapter is assembled to the energy storage device, the second liquid drain hole can be used as a positioning mark to set the disk body at the center of the energy storage device, thereby improving the assembly stability of the disk body and the adapter in the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the implementation manners will be briefly introduced below. Obviously, the accompanying drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0020] Figure 1 Structural schematic diagram of an energy storage system according to an embodiment of the present application;

[0021] Figure 2 Circuit block diagram of an energy storage system according to an embodiment of the present application;

[0022] Figure 3 Structural schematic diagram of an energy storage device according to another embodiment of the present application;

[0023] Figure 4 Exploded structural schematic diagram of an energy storage device according to another embodiment of the present application;

[0024] Figure 5 Structural schematic diagram of an energy storage device according to an embodiment of the present application;

[0025] Figure 6 Exploded structural schematic diagram of an energy storage device according to an embodiment of the present application;

[0026] Figure 7 Structural schematic diagram of an energy storage device according to another embodiment of the present application;

[0027] Figure 8 Exploded structural schematic diagram of an energy storage device according to another embodiment of the present application;

[0028] Figure 9 Structural schematic diagram of an energy storage device according to another embodiment of the present application;

[0029] Figure 10 Top view of an energy storage device according to an embodiment of the present application;

[0030] Figure 11 For an energy storage device according to an embodiment of the present application along Figure 10 Cross-sectional view in the A-A direction in;

[0031] Figure 12 For an energy storage device according to an embodiment of the present application along Figure 11 Enlarged view of the dashed box B in;

[0032] Figure 13 For an energy storage device according to an embodiment of the present application along Figure 11 Enlarged view of the dashed box C in;

[0033] Figure 14 Structural schematic diagram of an energy storage device according to another embodiment of the present application;

[0034] Figure 15 Explosion structure schematic diagram of an energy storage device according to another embodiment of the present application;

[0035] Figure 16 For an energy storage device according to an embodiment of the present application along Figure 15 Enlarged view of the dashed box D in;

[0036] Figure 17 Circuit block diagram of an electrical device according to an embodiment of the present application;

[0037] Figure 18 Structure schematic diagram of an electrical device according to an embodiment of the present application.

[0038] Explanation of reference numerals:

[0039] 100 - Energy storage device, 110 - End cover assembly, 111 - Top cover, 1111 - First surface, 1112 - Second surface, 1113 - Liquid injection hole, 112 - Separation member, 1121 - Liquid collection cavity, 1122 - First liquid flow hole, 1123 - Separation body part, 1124 - Second boss, 1125 - Second notch, 113 - Terminal post, 130 - Adapter, 131 - Disk body part, 1311 - Flow guiding groove, 1312 - Second liquid flow hole, 1313 - Body part, 1314 - First part, 1315 - Second part, 1316 - First boss, 1317 - Flow guiding convex ring, 1318 - Inner peripheral side wall, 1319 - End face, 1320 - Welding part, 1321 - First end, 1322 - Second end, 1323 - First notch, 133 - Adapter part, 140 - Accommodation groove, 141 - First accommodation sub - groove, 142 - Second accommodation sub - groove, 160 - Electrode assembly, 161 - Hollow structure, 162 - Tab, 170 - Housing, 171 - Accommodation cavity, 300 - Electrical device, 310 - Device body, 500 - Energy storage system, 510 - Electric energy conversion device, 520 - User load. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0041] In the description, claims, and the above-mentioned drawings of this application, terms such as "first" and "second" are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.

[0042] References to "embodiments" or "implementations" in this context mean that a particular feature, structure, or characteristic described in connection with the embodiments or implementations can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] 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.

[0044] 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 can cause grid instability, insufficient electricity during peak usage, and too much electricity during low usage. Unstable voltage can also damage the power. Therefore, problems such as "wind and light curtailment" may be caused due to insufficient electricity demand or insufficient grid acceptance capacity. To solve these problems, energy storage is required. That is, electric energy is converted into other forms of energy through physical or chemical means and stored, and the energy is converted back into electric energy and released when needed. Simply put, energy storage is similar to a large "power bank", which stores electric energy when photovoltaic and wind energy are sufficient and releases the stored electricity when needed.

[0045] Taking electrochemical energy storage as an example, this solution provides an energy storage device. The energy storage device is provided with a chemical battery, which mainly uses the chemical elements in the 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, the electric energy generated by wind energy and solar energy is stored in the chemical battery, and the stored electricity is released when the external electricity usage reaches a peak, or transferred to places with a shortage of electricity for further use.

[0046] The current energy storage (i.e., energy storage) application scenarios 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 corresponding energy storage devices include:

[0047] (1) Large energy storage containers applied in the grid side energy storage scenario can serve as high-quality active and reactive power regulation power sources in the grid, achieving load matching of electric energy in terms of time and space, enhancing the consumption capacity of renewable energy, and being of great significance in terms of grid system standby, alleviating the power supply pressure during peak loads, and peak shaving and frequency modulation.

[0048] (2) Medium and small-sized energy storage cabinets applied in the industrial and commercial energy storage scenarios (such as banks, shopping malls, etc.) on the user side and household small energy storage boxes applied in the household energy storage scenario on the user side mainly operate in the mode of "peak shaving and valley filling". Since there is a large price difference in electricity charges at peak and valley positions according to the electricity consumption demand, 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 peak electricity price period, they release 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 grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0049] Please refer to Figure 1 and Figure 2 , Figure 1 which is the application scenario diagram of the energy storage system 500 provided by the embodiments of the present application. The embodiments of the present application Figure 1 take the household energy storage scenario in the user side energy storage as an example for illustration, and the energy storage device 100 of the present application is not limited to the household energy storage scenario.

[0050] The present application provides an energy storage system 500. The energy storage system 500 is a household energy storage system 500. The energy storage system 500 includes an electric energy conversion device 510, a user load 520, and an energy storage device 100. The electric energy conversion device 510 is electrically connected to the user load 520 and the energy storage device 100 respectively. The electric energy conversion device 510 is used to convert other forms of energy into electric energy, and a part of the electric energy converted by the electric energy conversion device 510 is stored in the energy storage device 100, and a part is used to supply power to the user load 520. The energy storage device 100 is used to store electric energy and supply it to the user load 520 during the peak electricity price. The energy storage system 500 can not only convert other forms of energy into electric energy, but also store the electric energy in the energy storage device 100 to supply sufficient electric energy to the user load 520.

[0051] Understandably, in the energy storage system 500, the power conversion device 510, the user load 520, and the energy storage device 100 are electrically connected to each other.

[0052] Optionally, the power conversion device 510 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, mechanical energy, etc. into electrical energy to provide a stable power supply for the user load 520 and the energy storage device 100.

[0053] Optionally, the energy storage device 100 is a small energy storage box that can be installed on an outdoor wall in a wall-mounted manner.

[0054] Optionally, the power conversion device 510 can be a photovoltaic panel, and the photovoltaic panel can convert solar energy into electrical energy during the low electricity price period and store it in the energy storage device 100.

[0055] Optionally, the user load 520 can be a street lamp or household appliances, etc. The energy storage device 100 is used to store the electrical energy and supply it to the street lamp and household appliances for use during the peak electricity price period, or to supply power when the power grid is powered off / out of power.

[0056] Understandably, the energy storage device 100 can 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, the energy storage device 100 can be at least one of cylindrical batteries, square batteries, etc.

[0057] Please refer to Figures 3 to 9, this application provides an energy storage device 100, the energy storage device 100 includes an end cover assembly 110 and an adapter 130. The end cover assembly 110 includes a top cover 111, a terminal 113 and a separator 112. The top cover 111 includes a first surface 1111 and a second surface 1112 which are opposite to each other. The top cover 111 has a liquid injection hole 1113 penetrating through the first surface 1111 and the second surface 1112. The separator 112 is disposed on one side of the second surface 1112 of the top cover 111. The terminal 113 sequentially penetrates through the separator 112 and the top cover 111 and protrudes from the first surface 1111. The separator 112 has a liquid collecting cavity 1121. The liquid collecting cavity 1121 is recessed from the surface of the separator 112 facing the top cover 111. The separator 112 further has one or more first liquid flow holes 1122. The one or more first liquid flow holes 1122 penetrate through the bottom wall of the liquid collecting cavity 1121. The orthographic projection of the liquid injection hole 1113 on the second surface 1112 falls within the range of the orthographic projection of the liquid collecting cavity 1121 on the second surface 1112. The adapter 130 is disposed on the side of the separator 112 away from the top cover 111. The adapter 130 includes a disk portion 131 and an adapter portion 133 which are bent and connected. The adapter portion 133 is electrically connected to the end cover assembly 110 and is disposed on the side of the disk portion 131 close to the top cover 111. The disk portion 131 has a flow guiding groove 1311. The flow guiding groove 1311 is located on the surface of the disk portion 131 facing the top cover 111. The flow guiding groove 1311 is in a spiral structure. The disk portion 131 further has a second liquid flow hole 1312 communicating with the flow guiding groove 1311. The second liquid flow hole 1312 is at least partially located at the center of the disk portion 131. The orthographic projection of the first liquid flow hole 1122 on the surface of the disk portion 131 facing the top cover 111 at least partially falls within the range of the flow guiding groove 1311. The electrode assembly 160 is electrically connected to one end of the current collecting disk 131 away from the adapter portion 133. The electrode assembly 160 is in a wound state and forms a hollow structure 161. The orthographic projection of the second liquid flow hole 1312 on the surface of the electrode assembly 160 facing the end cover assembly 110 falls within the range of the hollow structure 161.

[0058] Optionally, the energy storage device 100 can be, but is not limited to, a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc.

[0059] Optionally, the separator 112 is a plastic part. The separator 112 is used to separate the top cover 111 and the electrode assembly 160 to prevent the energy storage device 100 from having a short circuit connection.

[0060] Optionally, in this embodiment, the terminal post 113 sequentially penetrates through the separating member 112 and the top cover 111. The terminal post 113 is insulated from the separating member 112 and electrically connected to the top cover 111 to electrically connect the electric energy inside the energy storage device 100 to external devices, and finally realize the charging and discharging process of the energy storage device 100.

[0061] It can be understood that the liquid collecting cavity 1121 is recessed in the surface of the separating part 112 facing the top cover 111, and the opening of the liquid collecting cavity 1121 faces away from the adapter 130.

[0062] It can be understood that the energy storage device 100 includes an electrolyte (not shown in the figure), and the electrolyte is used to soak the electrode assembly 160.

[0063] It can be understood that the second surface 1112 is closer to the separating member 112.

[0064] It can be understood that the first liquid passage hole 1122 penetrates through the bottom wall of the liquid collecting cavity 1121. That is, the liquid collecting cavity 1121 is communicated with the first liquid passage hole 1122, so that the electrolyte stored in the liquid collecting cavity 1121 can flow out of the liquid collecting cavity 1121 through the first liquid passage hole 1122 and drip onto the disk body portion 131.

[0065] It can be understood that the orthographic projection of the liquid injection hole 1113 on the second surface 1112 falls within the range of the orthographic projection of the liquid collecting cavity 1121 on the second surface 1112. That is, the orthographic projection of the liquid collecting cavity 1121 on the second surface 1112 covers the orthographic projection of the liquid injection hole 1113 on the second surface 1112. Then, when the electrolyte is injected from the liquid injection hole 1113, the electrolyte will be injected into the liquid collecting cavity 1121.

[0066] It can be understood that the orthographic projection of the first liquid passage hole 1122 on the surface of the disk body portion 131 facing the top cover 111 at least partially falls within the range of the diversion groove 1311. That is, the orthographic projection of the first liquid passage hole 1122 on the surface of the disk body portion 131 facing the top cover 111 overlaps at least partially with the diversion groove 1311. When the electrolyte drips from the first liquid passage hole 1122 onto the disk body portion 131, the orthographic projection of the first liquid passage hole 1122 on the surface of the disk body portion 131 facing the top cover 111 at least partially falls within the range of the diversion groove 1311, so that the electrolyte can directly fall into the diversion groove 1311, avoiding the electrolyte falling into the gap between the diversion grooves 1311 and affecting the liquid injection efficiency of the electrolyte.

[0067] Understandably, the flow guiding groove 1311 is in a spiral structure, which may be that the structure of the flow guiding groove 1311 is similar to the structure of "mosquito coil".

[0068] Understandably, the flow guiding groove 1311 communicates with the second liquid passage hole 1312, which may be that the spiral structure of the flow guiding groove 1311 extends in the direction of the second liquid passage hole 1312.

[0069] Understandably, at least a part of the second liquid passage hole 1312 is located at the center of the disk body portion 131, and the orthographic projection of the second liquid passage hole 1312 on the surface of the electrode assembly 160 facing the end cover assembly 110 falls within the range of the hollow structure 161, which may be that the second liquid passage hole 1312 is arranged adjacent to or directly aligned with the center of the disk body portion 131, and the second liquid passage hole 1312 is arranged opposite to the hollow structure 161.

[0070] Understandably, in the terms of this application, "a plurality of" means greater than or equal to two.

[0071] In this embodiment, the disk body 131 has a guide groove 1311 and the guide groove 1311 is in a spiral structure. The guide groove 1311 is connected to the second liquid hole 1312. The spiral structure is conducive to reducing the flow resistance of the electrolyte in the guide groove 1311, so that the electrolyte can smoothly flow to the second liquid hole 1312 and infiltrate the electrode assembly 160; and when the electrolyte drips on the surface of the disk body 131 facing the top cover 111, the guide groove 1311 guides and gathers the electrolyte. The guide groove 1311 provides a buffer channel for the electrolyte to prevent the electrolyte from dripping directly onto the electrode assembly 160 and causing splashing or uneven infiltration. When the electrolyte is injected from the injection hole 1113 of the top cover 111, the electrolyte is first stored in the liquid collecting chamber 1121 of the partition component 112, and then flows out of the liquid collecting chamber 1121 through the first liquid outlet hole 1122 arranged on the bottom wall of the liquid collecting chamber 1121, and the electrolyte drips into the guide groove 1311, and flows to the second liquid outlet hole 1312 under the guidance of the guide groove 1311. The guide groove 1311 is conducive to guiding the flow direction of the electrolyte, quickly gathering the electrolyte in the energy storage device 100, and improving the injection efficiency of the electrolyte. In addition, after the energy storage device 100 has been used for a long time, the hollow structure 161 of the electrode assembly 160 has a higher temperature, which in turn increases the migration speed of the active ions in the electrolyte located in the hollow structure 161 of the electrode assembly 160, and also increases the side reactions, so that the electrolyte in the hollow structure 161 of the electrode assembly 160 is consumed faster. The guide groove 1311 is connected to the second liquid drain hole 1312, and the second liquid drain hole 1312 is at least partially located at the center of the disk body 131. The orthographic projection of the second liquid drain hole 1312 on the surface of the electrode assembly 160 facing the end cover assembly 110 falls within the range of the hollow structure 161. The guide groove 1311 will gather the electrolyte dripping on the surface of the disk body 131 facing the top cover 111, and guide it to the second liquid drain hole 1312 arranged near the center of the disk body 131, so that the electrolyte infiltrates into the electrode assembly 160 from the second liquid drain hole 1312, that is, the electrolyte will directly infiltrate the hollow structure 161 of the electrode assembly 160, which is beneficial to ensure the sufficiency of the electrolyte in the hollow structure 161 of the electrode assembly 160, thereby improving the cycle life of the battery. Furthermore, the guide groove 1311 gathers the electrolyte and guides it to the second liquid outlet 1312. When the electrolyte directly infiltrates the hollow structure 161 of the electrode assembly 160, the electrolyte will diffuse from the hollow structure 161 of the electrode assembly 160 to the surroundings, so that the electrode assembly 160 has a uniform injection effect in all directions, thereby enhancing the uniformity of the electrolyte in the electrode assembly 160, which is beneficial to improving the performance of the energy storage device 100.Furthermore, at least a part of the second liquid passage hole 1312 is located at the center of the disc portion 131. When the adapter 130 is assembled to the energy storage device 100, the second liquid passage hole 1312 can be used as a positioning mark to position the disc portion 131 at the center of the energy storage device 100, thereby improving the assembly stability of the disc portion 131 and the adapter 130 in the energy storage device 100.

[0072] Optionally, in some embodiments, the center of the orthographic projection of the second liquid passage hole 1312 on the second surface 1112 at least partially overlaps with the center of the orthographic projection of the disc portion 131 on the second surface 1112; the center of the orthographic projection of the second liquid passage hole 1312 on the second surface 1112 at least partially overlaps with the center of the orthographic projection of the hollow structure 161 of the electrode assembly 160 on the second surface 1112.

[0073] In this embodiment, the center of the orthographic projection of the second liquid passage hole 1312 on the second surface 1112 at least partially overlaps with the center of the orthographic projection of the disc portion 131 on the second surface 1112. When the electrolyte drops onto the surface of the disc portion 131 facing the top cover 111, the electrolyte will flow along the structure of the diversion groove 1311 to the second liquid passage hole 1312, which is beneficial to guiding the electrolyte to the hollow structure 161 of the electrode assembly 160, ensuring sufficient electrolyte in the hollow structure 161 of the electrode assembly 160, and then improving the cycle life of the battery. The center of the orthographic projection of the second liquid passage hole 1312 on the second surface 1112 at least partially overlaps with the center of the orthographic projection of the hollow structure 161 of the electrode assembly 160 on the second surface 1112. Then, the electrolyte drops onto the electrode assembly 160 through the second liquid passage hole 1312 and infiltrates the electrode assembly 160, which is beneficial to ensuring sufficient electrolyte in the hollow structure 161 of the electrode assembly 160, enabling the electrolyte to diffuse from the center of the electrode assembly 160 to the surroundings, and having a uniform liquid injection effect in all directions of the electrode assembly 160, which is beneficial to improving the service performance and cycle performance of the energy storage device 100.

[0074] In some embodiments, the orthographic projection of the first liquid passage hole 1122 on the second surface 1112 at least partially overlaps with the orthographic projection of the liquid injection hole 1113 on the second surface 1112. In other words, the orthographic projection of the first liquid passage hole 1122 on the second surface 1112 at least partially falls within the range of the orthographic projection of the liquid injection hole 1113 on the second surface 1112.

[0075] In this embodiment, the orthographic projection of the first liquid passage hole 1122 on the second surface 1112 and the orthographic projection of the liquid injection hole 1113 on the second surface 1112 at least partially overlap. When the electrolyte is injected from the liquid injection hole 1113 and falls into the liquid collection cavity 1121, the liquid collection cavity 1121 can be used to store part of the electrolyte, so that the electrolyte can be stored in the liquid collection cavity 1121 first, and then flow out of the liquid collection cavity 1121 evenly along the first liquid passage hole 1122, avoiding the electrolyte directly passing through the first liquid passage hole 1122 and dripping onto the disc body part 131, which may cause electrolyte back-splash, thereby improving the safety performance of the energy storage device 100. In addition, the electrolyte has a certain viscosity. The partial overlap of the orthographic projection of the first liquid passage hole 1122 on the second surface 1112 and the orthographic projection of the liquid injection hole 1113 on the second surface 1112 can prevent more electrolyte from adhering to the bottom wall of the liquid collection cavity 1121, avoiding waste of the electrolyte and being beneficial to improving the utilization rate of the electrolyte.

[0076] In some embodiments, the orthographic projection of the first liquid passage hole 1122 on the second surface 1112 and the orthographic projection of the second liquid passage hole 1312 on the second surface 1112 are arranged staggeredly.

[0077] In this embodiment, the orthographic projection of the first liquid passage hole 1122 on the second surface 1112 and the orthographic projection of the second liquid passage hole 1312 on the second surface 1112 are arranged staggeredly. In other words, the orthographic projection of the first liquid passage hole 1122 on the second surface 1112 and the orthographic projection of the second liquid passage hole 1312 on the second surface 1112 do not overlap. When the electrolyte is injected from the liquid injection hole 1113 of the top cover 111, the electrolyte is first stored in the liquid collection cavity 1121 of the partition member 112, and then flows out of the liquid collection cavity 1121 through the first liquid passage hole 1122 provided on the bottom wall of the liquid collection cavity 1121. The first liquid passage hole 1122 and the second liquid passage hole 1312 are arranged staggeredly, which is beneficial to preventing the electrolyte flowing out of the liquid collection cavity 1121 from directly dripping onto the second liquid passage hole 1312, causing back-splash and reducing the safety performance of the energy storage device 100. In addition, the electrolyte flowing out of the liquid collection cavity 1121 first drips onto the diversion groove 1311 of the disc body part 131. The diversion groove 1311 guides the flow direction of the electrolyte and aggregates the electrolyte to the second liquid passage hole 1312, so that the electrolyte evenly passes through the diversion groove 1311 and the second liquid passage hole 1312, and then infiltrates the electrode assembly 160, improving the uniformity of the electrolyte infiltrating the electrode assembly 160, and thus improving the service performance of the energy storage device 100.

[0078] Optionally, in this application Figure 9In the embodiment, the diversion groove 1311 has a first end 1321 and a second end 1322 which are arranged opposite to each other. The diversion groove 1311 spirally extends from the first end 1321 to the second end 1322. The first end 1321 communicates with the second liquid passage hole 1312. The orthographic projection of the second end 1322 on the second surface 1112 at least partially overlaps with the orthographic projection of the first liquid passage hole 1122 on the second surface 1112. In other words, the orthographic projection of the first liquid passage hole 1122 on the surface of the disk portion 131 facing the top cover 111 at least partially overlaps with the second end 1322.

[0079] In this embodiment, the orthographic projection of the second end 1322 on the second surface 1112 at least partially overlaps with the orthographic projection of the first liquid passage hole 1122 on the second surface 1112, so that when the electrolyte flows out of the liquid collection cavity 1121 through the first liquid passage hole 1122, the electrolyte can drip onto the surface of the second end 1322 facing the top cover 111. The second end 1322 can prevent the electrolyte from moving in the direction away from the first end 1321, so that the diversion groove 1311 can effectively guide the electrolyte to move towards the first end 1321, which is beneficial to quickly gather the electrolyte and improve the liquid injection efficiency of the electrolyte.

[0080] Optionally, in this application Figure 7 and Figure 8 In the embodiment, the diversion groove 1311 has a first end 1321 and a second end 1322 which are arranged opposite to each other. The first end 1321 communicates with the second liquid passage hole 1312. The diversion groove 1311 spirally extends from the first end 1321 to the overlapping position of the orthographic projection of the first liquid passage hole 1122 on the surface of the disk portion 131 facing the top cover 111 and the diversion groove 1311, and then extends to the second end 1322. In other words, the overlapping position of the orthographic projection of the first liquid passage hole 1122 on the surface of the disk portion 131 facing the top cover 111 and the diversion groove 1311 is located between the first end 1321 and the second end 1322.

[0081] In this embodiment, the flow guide groove 1311 spirally extends from the first end 1321 to the overlapping position of the positive projection of the first liquid passage hole 1122 on the surface of the disk portion 131 facing the top cover 111 and the flow guide groove 1311, and then continues to extend to the second end 1322. When the electrolyte flows out of the liquid collection cavity 1121 through the first liquid passage hole 1122, if the electrolyte drips on the connecting portion of the spiral structure of the flow guide groove 1311, the electrolyte can flow and gather in the flow guide groove 1311 under the action of gravity. The part of the flow guide groove 1311 that extends from the overlapping position of the positive projection of the first liquid passage hole 1122 on the surface of the disk portion 131 facing the top cover 111 to the second end 1322 increases the length of the flow guide groove 1311 and enhances the ability of the flow guide groove 1311 to gather the electrolyte, which is beneficial to improving the liquid injection efficiency of the electrolyte.

[0082] Please refer to Figures 3 to 9 , in some embodiments, the disk portion 131 includes a body portion 1313, the body portion 1313 includes a first portion 1314 and a second portion 1315 connected to each other. The surface of the first portion 1314 facing the top cover 111 is recessed from the surface of the second portion 1315 facing the top cover 111. The surface of the first portion 1314 facing the top cover 111 is set farther away from the top cover 111 than the surface of the second portion 1315 facing the top cover 111 to form the flow guide groove 1311; the surface of the first portion 1314 facing away from the top cover 111 protrudes from the surface of the second portion 1315 facing away from the top cover 111. In other words, the first portion 1314 and the second portion 1315 enclose the flow guide groove 1311.

[0083] In this embodiment, the surface of the first part 1314 facing the top cover 111 is recessed from the surface of the second part 1315 facing the top cover 111. The surface of the first part 1314 facing the top cover 111 is disposed farther from the top cover 111 than the surface of the second part 1315 facing the top cover 111, so as to form a diversion groove 1311. Then, when the electrolyte flows out of the liquid collecting cavity 1121, due to the action of gravity, the electrolyte will drip onto the first part 1314 recessed from the surface of the second part 1315 facing the top cover 111, that is, the electrolyte will accumulate on the first part 1314. The first part 1314 will guide the flow direction of the electrolyte, preventing the electrolyte from flowing around on the surface of the disk body part 131 facing the top cover 111, thereby effectively preventing the electrolyte from flowing into the electrode assembly 160 from different directions, and finally avoiding uneven wetting of the electrode assembly 160. The first part 1314 guides the electrolyte to the second liquid flow hole 1312, so that the electrolyte uniformly wets the electrode assembly 160 from the second liquid flow hole 1312, improving the wetting uniformity and wetting efficiency of the electrode assembly 160. In addition, the surface of the first part 1314 facing away from the top cover 111 protrudes from the surface of the second part 1315 facing away from the top cover 111. When the adapter 130 is assembled to the energy storage device 100, the surface of the first part 1314 facing away from the top cover 111 is disposed closer to the electrode assembly 160 than the surface of the second part 1315 facing away from the top cover 111. The surface of the first part 1314 facing away from the top cover 111 can serve as a welding part 1320. The welding part 1320 has a large area. The welding part 1320 is welded to the electrode assembly 160, thereby increasing the welding area between the disk body part 131 and the electrode assembly 160, ensuring the electrical connection stability between the disk body part 131 and the electrode assembly 160, further improving the conductive performance of the electrode assembly 160, reducing the internal resistance of the energy storage device 100, and then improving the safety performance of the energy storage device 100. In addition, the welding part 1320 can effectively ensure the current collecting ability for the electrode assembly 160, and then improve the energy utilization rate of the energy storage device 100. The first part 1314 and the second part 1315 of the embodiment of the present application are provided with concavities and convexities, so that the two opposite surfaces of the first part 1314 can respectively play the roles of diversion and improving welding performance, and this method has a simple preparation process, which is beneficial to simplifying the manufacturing process of the adapter 130.

[0084] It can be understood that the first part 1314 and the second part 1315 are of an integral structure, and the first part 1314 is in a spiral structure and extends towards the second liquid flow hole 1312.

[0085] In this embodiment, the first part 1314 and the second part 1315 enclose the flow guiding groove 1311. The first part 1314 constitutes the bottom of the flow guiding groove 1311. The first part 1314 is in a spiral structure and extends towards the second liquid flow hole 1312. When the electrolyte flows out of the liquid collecting cavity 1121 through the first liquid flow hole 1122, the electrolyte drops onto the first part 1314. The first part 1314 is in a spiral structure, so that the electrolyte dropping onto the first part 1314 flows along the spiral structure to the second liquid flow hole 1312. The spiral structure of the first part 1314 is beneficial to guiding the flow direction of the electrolyte, quickly aggregating the electrolyte in the energy storage device 100, and improving the liquid injection efficiency of the electrolyte.

[0086] Please refer to Figures 3 to 12 , in some embodiments, when the partition member 112 has a plurality of first liquid flow holes 1122, the plurality of first liquid flow holes 1122 are arranged at intervals. In the direction parallel to the radial direction of the disk part 131, the distance between the two farthest points in the region enclosed by the orthographic projections of any two of the first liquid flow holes 1122 on the second surface 1112 is H1, and the line width of the flow guiding groove 1311 is H2. Then, the line width H2 of the flow guiding groove 1311 satisfies the range: 0.5 mm ≤ H2 - H1 ≤ 2 mm. Specifically, the value of H2 - H1 can be, but is not limited to, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, etc.

[0087] In this embodiment, the plurality of first liquid flow holes 1122 are spaced apart on the bottom wall of the liquid collection cavity 1121, so that the electrolyte stored in the liquid collection cavity 1121 can stably flow out between the plurality of first liquid flow holes 1122 and drip onto the surface of the disk body portion 131 facing the top cover 111. When the line width H2 of the diversion groove 1311 satisfies the range: 0.5 mm ≤ H2 - H1 ≤ 2 mm, the distance H1 between the two farthest points in the region surrounded by the orthographic projections of any two of the first liquid flow holes 1122 on the second surface 1112 and the line width H2 of the diversion groove 1311 are within a reasonable range, so that when the electrolyte flows out of the liquid collection cavity 1121, almost all of the electrolyte can directly drip onto the diversion groove 1311 and flow along the diversion groove 1311 to the second liquid flow hole 1312 located at the center of the disk body portion 131, and then the electrolyte directly wets the hollow structure 161 of the electrode assembly 160, which is beneficial to ensuring the sufficiency of the electrolyte in the hollow structure 161 of the electrode assembly 160, and then improving the cycle life of the battery. When the value of H2 - H1 is greater than 2 mm, the line width of the diversion groove 1311 is too large, so that the line width of the welding portion 1320 is too large, which will increase the welding difficulty between the welding portion 1320 and the electrode assembly 160, is not conducive to simplifying the welding process, and then reduces the assembly efficiency of the energy storage device 100; in addition, the line width of the diversion groove 1311 is too large, so that the flow rate of the electrolyte on the diversion groove 1311 is reduced, and then the liquid injection efficiency of the electrolyte is reduced. When the value of H2 - H1 is less than 0.5 mm, the line width H2 of the diversion groove 1311 is too small, and the distance H1 between the two farthest points in the region surrounded by the orthographic projections of any two of the first liquid flow holes 1122 on the second surface 1112 is too large. Then, when the electrolyte flows out of the liquid collection cavity 1121, part of the electrolyte can directly drip onto the diversion groove 1311, and part of the electrolyte drips onto the second portion 1315. The electrolyte dripping onto the second portion 1315 needs some time to move onto the diversion groove 1311, which reduces the aggregation efficiency of the diversion groove 1311 for the electrolyte, and then reduces the liquid injection efficiency of the electrolyte.

[0088] Preferably, in some embodiments, along the arrangement direction perpendicular to the first surface 1111 and the second surface 1112, the distance between the two farthest points in the region surrounded by the orthographic projections of any two of the first liquid flow holes 1122 on the second surface 1112 is H1, and the line width of the diversion groove 1311 is H2, then the relational expression is satisfied: H2 = H1.

[0089] In this embodiment, when the line width H2 of the diversion groove 1311 satisfies H2 = H1, the distance H1 between the two farthest points in the region surrounded by the orthographic projections of any two of the first liquid passage holes 1122 on the second surface 1112 is equal to the line width H2 of the diversion groove 1311. When the electrolyte flows out of the liquid collecting cavity 1121, most of the electrolyte can directly drip onto the diversion groove 1311 and flow along the diversion groove 1311 to the second liquid passage hole 1312 located at the center of the disk body portion 131, thereby directly wetting the hollow structure 161 of the electrode assembly 160, which is beneficial to ensuring the sufficiency of the electrolyte in the hollow structure 161 of the electrode assembly 160 and then improving the cycle life of the battery.

[0090] In some embodiments, in the direction parallel to the radial direction of the disk body portion 131, the value of the distance H1 between the two farthest points in the region surrounded by the orthographic projections of any two of the first liquid passage holes 1122 on the second surface 1112 satisfies the range: 2 mm ≤ H1 ≤ 4 mm. Specifically, the value of the distance H1 between the two farthest points in the region surrounded by the orthographic projections of any two of the first liquid passage holes 1122 on the second surface 1112 can be, but is not limited to, 2 mm, 2.1 mm, 2.3 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3.0 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.7 mm, 3.8 mm, 3.9 mm, and 4 mm, etc.

[0091] In this embodiment, when the distance H1 between the two farthest points in the region surrounded by the orthographic projections of any two of the first liquid passage holes 1122 on the second surface 1112 satisfies the range: 2 mm ≤ H1 ≤ 4 mm, the value of H1 is within a reasonable range. When the diameter of the first liquid passage hole 1122 is fixed, the connecting portion between the first liquid passage holes 1122 is within a reasonable range, enabling the electrolyte to smoothly flow out of the liquid collecting cavity 1121 through the first liquid passage holes 1122 and drip onto the surface of the disk portion 131 facing the top cover 111, while preventing the electrolyte from hitting back into the liquid collecting cavity 1121 through the first liquid passage holes 1122 when the energy storage device 100 vibrates or drops, so that the energy storage device 100 has a high safety performance. When the distance H1 between the two farthest points in the region surrounded by the orthographic projections of any two of the first liquid passage holes 1122 on the second surface 1112 is greater than 4 mm, the value of H1 is too large. When the diameter of the first liquid passage hole 1122 is fixed, the connecting portion between the first liquid passage holes 1122 has a large area. When the electrolyte is injected from the liquid injection hole 1113 of the top cover 111 and drips into the liquid collecting cavity 1121, the connecting portion between the first liquid passage holes 1122 will block the electrolyte from falling onto the surface of the disk portion 131 facing the top cover 111, reducing the utilization rate of the electrolyte; and it is easy to cause splashing back, thereby reducing the safety performance of the energy storage device 100. When the distance H1 between the two farthest points in the region surrounded by the orthographic projections of any two of the first liquid passage holes 1122 on the second surface 1112 is less than 2 mm, the value of H1 is too small. When the diameter of the first liquid passage hole 1122 is fixed, the connecting portion between the first liquid passage holes 1122 has a small area, and it is difficult for the connecting portion between the first liquid passage holes 1122 to block the electrolyte. When the energy storage device 100 vibrates or drops, the electrolyte will directly pass through the multiple first liquid passage holes 1122 and hit back into the liquid collecting cavity 1121, and even hit back the top cover 111 to cause a short circuit, reducing the safety performance of the energy storage device 100.

[0092] In some embodiments, the line width H2 of the flow guiding groove 1311 satisfies the range: 2.5 mm ≤ H2 ≤ 6 mm. Specifically, the value of the line width H2 of the flow guiding groove 1311 can be, but is not limited to, 2.5 mm, 2.6 mm, 2.7 mm, 2.9 mm, 3.0 mm, 3.1 mm, 3.3 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.1 mm, 4.3 mm, 4.5 mm, 4.7 mm, 4.9 mm, 5.0 mm, 5.1 mm, 5.2 mm, 5.3 mm, 5.5 mm, 5.7 mm, 5.8 mm, and 6 mm, etc.

[0093] In this embodiment, when the line width H2 of the flow guiding groove 1311 satisfies the range: 2.5 mm ≤ H2 ≤ 6 mm, the line width of the flow guiding groove 1311 is within a reasonable range, so that when the electrolyte flows out of the liquid collecting cavity 1121, more electrolyte can directly drip onto the flow guiding groove 1311 and flow along the flow guiding groove 1311 to the second liquid flow hole 1312 located at the center of the disk body portion 131, and then the electrolyte directly wets the hollow structure 161 of the electrode assembly 160, which is beneficial to ensuring the sufficiency of the electrolyte in the hollow structure 161 of the electrode assembly 160, and then improving the cycle life of the battery. When the line width H2 of the flow guiding groove 1311 is greater than 6 mm, the line width of the flow guiding groove 1311 is too large, resulting in too large a line width of the welding portion 1320, which will increase the welding difficulty between the welding portion 1320 and the electrode assembly 160, is not conducive to simplifying the welding process, and then reduces the assembly efficiency of the energy storage device 100. When the line width H2 of the flow guiding groove 1311 is less than 2.5 mm, the line width of the flow guiding groove 1311 is too small, so that when the electrolyte flows out of the liquid collecting cavity 1121, less electrolyte can directly drip onto the flow guiding groove 1311, and more electrolyte drips onto the second portion 1315. The electrolyte dripping onto the second portion 1315 needs some time to move onto the flow guiding groove 1311, reducing the aggregation efficiency of the flow guiding groove 1311 for the electrolyte, and then reducing the liquid injection efficiency of the electrolyte.

[0094] In some embodiments, in a direction parallel to the radial direction of the disk portion 131, if the distance between the two closest points within the region enclosed by the orthographic projections of any two of the first liquid passage holes 1122 on the second surface 1112 is H3, then 0.3H2 ≤ H3 ≤ 0.5H2. Specifically, the value of the distance H3 between the two closest points within the region enclosed by the orthographic projections of any two of the first liquid passage holes 1122 on the second surface 1112 may be, but is not limited to, 0.3H2, 0.31H2, 0.32H2, 0.33H2, 0.35H2, 0.36H2, 0.38H2, 0.39H2, 0.40H2, 0.41H2, 0.42H2, 0.43H2, 0.44H2, 0.45H2, 0.46H2, 0.47H2, 0.48H2, 0.49H2, and 0.5H2, etc.

[0095] In this embodiment, when the distance H3 between the two closest points in the region surrounded by the orthographic projections of any two of the first liquid flow holes 1122 on the second surface 1112 satisfies the relation 0.3H2 ≤ H3 ≤ 0.5H2, the distance between the two closest points in the region surrounded by the orthographic projections of any two of the first liquid flow holes 1122 on the second surface 1112 is within a reasonable range. The electrolyte can not only smoothly flow out of the liquid collection cavity 1121 through the first liquid flow holes 1122 and drip onto the surface of the disk body part 131 facing the top cover 111, but also prevent the electrolyte from hitting back into the liquid collection cavity 1121 through the first liquid flow holes 1122 when the energy storage device 100 vibrates or drops, improving the safety performance, utilization rate of the electrolyte and liquid injection efficiency of the energy storage device 100. When the value of H3 is greater than 0.5H2, the distance between the two closest points in the region surrounded by the orthographic projections of any two of the first liquid flow holes 1122 on the second surface 1112 is too large, and the connecting part between the first liquid flow holes 1122 has a large area. When the electrolyte is injected from the liquid injection hole 1113 of the top cover 111 and drips into the liquid collection cavity 1121, the connecting part between the first liquid flow holes 1122 will block the electrolyte from falling onto the surface of the disk body part 131 facing the top cover 111, reducing the utilization rate of the electrolyte; and it is easy to cause back-splash, thereby reducing the safety performance of the energy storage device 100. When the value of H3 is less than 0.3H2, the distance between the two closest points in the region surrounded by the orthographic projections of any two of the first liquid flow holes 1122 on the second surface 1112 is too small, then the connecting part between the first liquid flow holes 1122 has a small area, and it is difficult for the connecting part between the first liquid flow holes 1122 to block the electrolyte. When the energy storage device 100 vibrates or drops, the electrolyte will directly pass through the plurality of first liquid flow holes 1122 and hit back into the liquid collection cavity 1121, and even hit back the top cover 111 to cause a short circuit, reducing the safety performance of the energy storage device 100. In addition, the small area of the connecting part between the first liquid flow holes 1122 results in a weak structural strength of the bottom wall of the liquid collection cavity 1121.

[0096] Optionally, in some embodiments, in a direction parallel to the radial direction of the disk body portion 131, the distance H3 between the two closest points in the region surrounded by the orthographic projections of any two of the first liquid passage holes 1122 on the second surface 1112 satisfies the range: 0.6 mm ≤ H3 ≤ 2.5 mm. Specifically, the value of the distance H3 between the two closest points in the region surrounded by the orthographic projections of any two of the first liquid passage holes 1122 on the second surface 1112 may be, but is not limited to, 0.6 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, etc.

[0097] In this embodiment, when the distance H3 between the two closest points in the region enclosed by the orthographic projections of any two of the first liquid passage holes 1122 on the second surface 1112 satisfies the range: 0.6 mm ≤ H3 ≤ 2.5 mm, the distance between the two closest points in the region enclosed by the orthographic projections of any two of the first liquid passage holes 1122 on the second surface 1112 is within a reasonable range. The electrolyte can smoothly flow out of the liquid collection cavity 1121 through the first liquid passage holes 1122 and drip onto the surface of the disk body portion 131 facing the top cover 111, and can prevent the electrolyte from hitting back into the liquid collection cavity 1121 through the first liquid passage holes 1122 when the energy storage device 100 vibrates or drops, improving the safety performance, utilization rate of the electrolyte, and liquid injection efficiency of the energy storage device 100. When the value of H3 is greater than 2.5 mm, the distance between the two closest points in the region enclosed by the orthographic projections of any two of the first liquid passage holes 1122 on the second surface 1112 is too large, and the connecting portion between the first liquid passage holes 1122 has a large area. When the electrolyte is injected from the liquid injection hole 1113 of the top cover 111 and drips into the liquid collection cavity 1121, the connecting portion between the first liquid passage holes 1122 will block the electrolyte from falling onto the surface of the disk body portion 131 facing the top cover 111, reducing the utilization rate of the electrolyte; and it is easy to cause splashing back, thereby reducing the safety performance of the energy storage device 100. When the value of H3 is less than 0.6 mm, the distance between the two closest points in the region enclosed by the orthographic projections of any two of the first liquid passage holes 1122 on the second surface 1112 is too large, then the connecting portion between the first liquid passage holes 1122 has a small area, and it is difficult for the connecting portion between the first liquid passage holes 1122 to block the electrolyte. When the energy storage device 100 vibrates or drops, the electrolyte will directly pass through the first liquid passage holes 1122 and hit back into the liquid collection cavity 1121, and even hit back the top cover 111 to cause a short circuit, reducing the safety performance of the energy storage device 100.

[0098] In some embodiments, the sum of the orthographic projection areas of the plurality of first liquid flow holes 1122 on the second surface 1112 is S1, and the overlapping area of the orthographic projection of the plurality of first liquid flow holes 1122 on the second surface 1112 and the orthographic projection of the diversion groove 1311 on the second surface 1112 is S2. Then, the relational expression is satisfied: 0.4 ≤ S2 / S1 ≤ 1. Specifically, the value of S2 / S1 can be, but is not limited to, 0.4, 0.42, 0.45, 0.47, 0.49, 0.50, 0.52, 0.54, 0.56, 0.58, 0.6, 0.62, 0.68, 0.70, 0.73, 0.76, 0.8, 0.84, 0.86, 0.89, 0.92, 0.94, 0.96, and 1, etc.

[0099] In this embodiment, the orthographic projection of the first liquid flow hole 1122 on the surface of the disk body portion 131 facing the top cover 111 at least partially falls within the range of the diversion groove 1311. When the sum S1 of the orthographic projection areas of the plurality of first liquid flow holes 1122 on the second surface 1112 and the overlapping area S2 of the orthographic projection of the plurality of first liquid flow holes 1122 on the second surface 1112 and the orthographic projection of the diversion groove 1311 on the second surface 1112 satisfy the relational expression 0.4 ≤ S2 / S1 ≤ 1, the value of the overlapping area S2 of the orthographic projection of the plurality of first liquid flow holes 1122 on the second surface 1112 and the orthographic projection of the diversion groove 1311 on the second surface 1112 is within a reasonable range. When the electrolyte flows out from the liquid collection cavity 1121, more electrolyte can directly drip onto the diversion groove 1311 and flow along the diversion groove 1311 to the second liquid flow hole 1312 located at the center of the disk body portion 131, and then the electrolyte directly wets the hollow structure 161 of the electrode assembly 160, which is beneficial to ensuring the sufficiency of the electrolyte in the hollow structure 161 of the electrode assembly 160, and then improving the cycle life of the battery. When the value of S2 / S1 is less than 0.4, the value of the overlapping area S2 of the orthographic projection of the plurality of first liquid flow holes 1122 on the second surface 1112 and the orthographic projection of the diversion groove 1311 on the second surface 1112 is too small. When the electrolyte flows out from the liquid collection cavity 1121 through the first liquid flow hole 1122, less electrolyte can directly drip onto the diversion groove 1311, and more electrolyte drips onto the second part 1315. The electrolyte dripping onto the second part 1315 needs some time to move onto the diversion groove 1311, reducing the aggregation efficiency of the diversion groove 1311 for the electrolyte and then reducing the liquid injection efficiency of the electrolyte.

[0100] In some embodiments, the disk body portion 131 also includes a first boss 1316, which is arranged around the outer periphery of the main body portion 1313 and protrudes from the surface of the second portion 1315 facing the top cover 111, and the first boss 1316 has a first notch 1323. The portion of the disk body portion 131 connected to the adapter portion 133 is arranged adjacent to the first notch 1323.

[0101] In this embodiment, when the electrolyte is injected from the injection hole 1113 of the top cover 111, the electrolyte is first stored in the liquid collecting chamber 1121 of the partition component 112, and then flows out of the liquid collecting chamber 1121 through the first liquid outlet hole 1122 arranged on the bottom wall of the liquid collecting chamber 1121, and the electrolyte drips on the surface of the disk body 131 facing the top cover 111. Most of the electrolyte will drip into the guide groove 1311, and a small part of the electrolyte will drip or be splashed onto the second part 1315. The first boss 1316 is arranged on the periphery of the main body 1313, which can effectively prevent the electrolyte that drips or is splashed onto the second part 1315 from flowing along the second part 1315 to the periphery and dripping onto the electrode assembly 160, thereby reducing the waste of electrolyte. The first boss 1316 is beneficial to increasing the utilization rate of the electrolyte and improving the injection effect. In addition, the first boss 1316 has a first notch 1323, so that when the disk body 131 and the adapter 133 are assembled on the energy storage device 100, the portion of the disk body 131 and the adapter 133 that is bent and connected is arranged adjacent to the first notch 1323, which is conducive to improving the regularity of the adapter 130 assembled on the energy storage device 100, and then improving the safety performance of the energy storage device 100. Furthermore, by providing the first boss 1316, there is a gap between the surface of the disk body 131 facing the top cover 111 and the first liquid flow hole 1122, and the electrolyte can flow along the first liquid flow hole 1122 to the guide groove 1311, avoiding that the electrolyte can only drip from the part of the first liquid flow hole 1122 arranged opposite to the guide groove 1311 to the guide groove 1311, and also avoiding that the electrolyte directly adheres to the surface of the liquid collecting chamber 1121 away from the top cover 111, which is conducive to improving the injection efficiency of the electrolyte.

[0102] See also Figures 3 to 13In some embodiments, the disc body 131 includes a main body 1313, the partition member 112 includes a partition body 1123 and a second boss 1124, the partition body 1123 has a liquid collecting chamber 1121, the liquid collecting chamber 1121 is recessed in the surface of the partition body 1123 facing the top cover 111, the second boss 1124 is arranged on the surface of the partition body 1123 away from the top cover 111, and is arranged around the outer periphery of the partition body 1123, the second boss 1124 has a second notch 1125, the The portion where the disk body 131 and the adapter portion 133 are connected is arranged adjacent to the second notch 1125; the separating body portion 1123 and the second boss 1124 enclose a receiving groove 140, and the receiving groove 140 is used to receive the disk body 131 and the adapter portion 133, wherein the surface of the second boss 1124 facing away from the top cover 111 is flush with the surface of the second portion 1315 facing away from the top cover 111, and the surface of the first boss 1316 facing the top cover 111 presses against the surface of the separating body portion 1123 facing away from the top cover 111.

[0103] In this embodiment, the second boss 1124 is arranged on the surface of the partition body portion 1123 away from the top cover 111, and the partition body portion 1123 and the second boss 1124 enclose a receiving groove 140, and the receiving groove 140 is used to accommodate the disk body portion 131 and the adapter portion 133, so that along the arrangement direction of the first surface 1111 and the second surface 1112, the adapter 130 and the end cover assembly 110 occupy a smaller thickness, which is beneficial to saving space of the energy storage device 100 and facilitating the assembly of more electrode assemblies 160 in the energy storage device 100, thereby improving the energy density of the energy storage device 100. In addition, the surface of the second boss 1124 facing away from the top cover 111 is flush with the surface of the second portion 1315 facing away from the top cover 111, and the surface of the first boss 1316 facing the top cover 111 abuts against the surface of the partition body portion 1123 facing away from the top cover 111, which is beneficial to improving the structural stability of the adapter 130 and the end cover assembly 110 when assembled on the energy storage device 100, so that when the energy storage device 100 vibrates or falls, the probability of the portion where the adapter portion 133 and the disc body portion 131 are bent and connected due to excessive bending is reduced, and the relative position of the end cover assembly 110 and the adapter 130 is relatively stable, avoiding the end cover assembly 110 and the adapter 130 from breaking due to excessive vibration amplitude, thereby improving the safety performance of the energy storage device 100 and further extending the service life of the energy storage device 100.

[0104] In some embodiments, the adapter 130 includes a disk body portion 131 and an adapter portion 133 that are connected by bending, and an extension direction of one end of the disk body portion 131 away from the adapter portion 133 is parallel to an extension direction of one end of the adapter portion 133 away from the disk body portion 131. In other words, the adapter portion 133 and the disk body portion 131 are stacked.

[0105] In this embodiment, the disk body 131 is connected to the adapter portion 133 by bending, and the adapter portion 133 and the disk body 131 are stacked, so that when the adapter 130 is applied to the energy storage device 100, it is beneficial to save the space occupied by the adapter 130, which is beneficial to assemble more electrode assemblies 160 in the energy storage device 100, thereby improving the energy density of the energy storage device 100.

[0106] In some embodiments, the accommodating groove 140 includes a first accommodating sub-groove 141 and a second accommodating sub-groove 142 which are connected to each other. The first accommodating sub-groove 141 is arranged on a side of the second accommodating sub-groove 142 close to the top cover 111. The first accommodating sub-groove 141 is used to accommodate the adapter portion 133, and the second accommodating sub-groove 142 is used to accommodate the disk body portion 131.

[0107] It can be understood that the bottom wall portion of the second accommodating sub-groove 142 is recessed in the first accommodating sub-groove 141, and the second accommodating sub-groove 142 is connected to the first accommodating sub-groove 141 for accommodating the adapter 130, and the first accommodating sub-groove 141 is arranged closer to the top cover 111 than the second accommodating sub-groove 142.

[0108] In the present embodiment, the first accommodating sub-groove 141 is arranged closer to the top cover 111 than the second accommodating sub-groove 142, the adapter 130 is bent and connected, the first accommodating sub-groove 141 is used to accommodate the adapter portion 133, the second accommodating sub-groove 142 is used to accommodate the disk portion 131, and the bottom of the second accommodating sub-groove 142 is recessed in the first accommodating sub-groove 141, which is conducive to fully utilizing the space, so that when the end cover assembly 110 and the adapter 130 are applied to the energy storage device 100, along the arrangement direction of the first surface 1111 and the second surface 1112, the adapter 130 and the end cover assembly 110 occupy a smaller thickness, which is conducive to saving space of the energy storage device 100, facilitating the assembly of more electrode assemblies 160 in the energy storage device 100, thereby improving the energy density of the energy storage device 100, and also facilitating the miniaturization design of the energy storage device 100.

[0109] See also Figures 14 to 16, in some embodiments, the disk body portion 131 includes a body portion 1313, and the disk body portion 131 further includes a diversion convex ring 1317. The diversion convex ring 1317 is disposed on the surface of the body portion 1313 facing away from the top cover 111 and protrudes in a direction away from the top cover 111. The diversion convex ring 1317 is disposed around the outer periphery of the second liquid passage hole 1312.

[0110] In this embodiment, the diversion convex ring 1317 is disposed on the surface of the body portion 1313 facing away from the top cover 111 and protrudes in a direction away from the top cover 111. When the electrolyte drops into the diversion groove 1311 and flows to the second liquid passage hole 1312 under the guidance of the diversion groove 1311, the electrolyte will flow along the diversion convex ring 1317 in a direction close to the electrode assembly 160, avoiding waste of the electrolyte caused by the electrolyte hovering around the second liquid passage hole 1312 and improving the utilization rate of the electrolyte. In addition, the diversion convex ring 1317 can penetrate through the hollow structure 161 of the electrode assembly 160, so that the electrolyte dripping on the disk body portion 131 can directly drip into the hollow structure 161 of the electrode assembly 160 along the diversion convex ring 1317, which is beneficial to ensuring the sufficiency of the electrolyte in the hollow structure 161 of the electrode assembly 160, thereby enhancing the cycle life of the battery. Furthermore, when the electrolyte directly infiltrates the hollow structure 161 of the electrode assembly 160, the electrolyte will diffuse from the hollow structure 161 of the electrode assembly 160 to the surroundings, so that the electrode assembly 160 has a uniform liquid injection effect in all directions, enhancing the uniformity of the electrolyte in the electrode assembly 160 and being beneficial to improving the performance of the energy storage device 100.

[0111] In some embodiments, the diversion convex ring 1317 has an inner peripheral side wall 1318 and an end face 1319 connected to each other. In the thickness direction of the energy storage device 100, the end face 1319 is the surface of the diversion convex ring 1317 facing away from the top cover 111, and the connection between the inner peripheral side wall 1318 and the end face 1319 has an arc chamfer.

[0112] It can be understood that the thickness direction of the energy storage device 100 is the arrangement direction of the first surface 1111 and the second surface 1112.

[0113] In this embodiment, an arc chamfer is provided at the connection between the inner peripheral side wall 1318 and the end face 1319, so that when the electrolyte drops into the guide groove 1311 and flows to the second liquid discharge hole 1312 under the guidance of the guide groove 1311, the electrolyte will flow along the arc chamfer toward the direction close to the electrode assembly 160. The arc chamfer provides a space for the electrolyte to stay briefly, so that the electrolyte is less affected by the gravity of the fluid, thereby preventing the electrolyte from dripping directly toward the direction close to the electrode assembly 160 and causing electrolyte splashing, avoiding waste of electrolyte, and effectively improving the safety performance of the energy storage device 100.

[0114] See also Figure 3 and Figure 4 In some embodiments, the energy storage device 100 further includes a shell 170, which is disposed on one side of the end cover assembly 110 and connected to the shell 170. The shell 170 has a housing cavity 171 for accommodating the electrode assembly 160. The guide convex ring 1317 is at least partially inserted into the hollow structure 161. In other words, the orthographic projection of the guide convex ring 1317 on the surface of the electrode assembly 160 facing the top cover 111 falls within the range of the hollow structure 161.

[0115] In this embodiment, the electrode assembly 160 is electrically connected to the adapter 133, the disk body 131 and the end cap assembly 110 in sequence, so as to electrically connect the energy storage device 100 to external equipment, and then realize the charging and discharging process of the energy storage device 100. The electrode assembly 160 provided in the embodiment of the present application is in a wound state and forms a hollow structure 161, and the guide convex ring 1317 is penetrated in the hollow structure 161, so that the electrolyte dripping on the disk body 131 can drip directly to the hollow structure 161 of the electrode assembly 160 along the guide convex ring 1317, which is conducive to ensuring the sufficiency of the electrolyte in the hollow structure 161 of the electrode assembly 160, and then improving the cycle life of the battery. Furthermore, when the electrolyte directly infiltrates the hollow structure 161 of the electrode assembly 160, the electrolyte will diffuse from the hollow structure 161 of the electrode assembly 160 to the surroundings, so that the electrode assembly 160 has a uniform injection effect in all directions, thereby enhancing the uniformity of the electrolyte in the electrode assembly 160, which is beneficial to improving the performance of the energy storage device 100.

[0116] Optionally, the electrode assembly 160 includes a positive electrode sheet (not shown), a separator (not shown) and a negative electrode sheet (not shown) arranged in sequence, and the positive electrode sheet, the separator and the negative electrode sheet are stacked in sequence and then wound, so that the electrode assembly 160 is in a wound state and forms a hollow structure 161. All of them are electrically connected to the end cap assembly 110 through the disc body 131 and the adapter assembly.

[0117] Optionally, the positive electrode sheet and the negative electrode sheet are both electrically connected to the end cap assembly 110 through an adapter 130. The positive electrode sheet includes a positive current collector, a positive electrode tab 162 electrically connected to the positive current collector, and a positive active layer disposed on the surface of the positive current collector, and the positive electrode sheet is electrically connected to the adapter 130 through the positive electrode tab 162. The negative electrode sheet includes a negative current collector, a negative electrode tab 162 electrically connected to the negative current collector, and a negative active layer disposed on the surface of the negative current collector, and the negative electrode sheet is electrically connected to the adapter 130 through the negative electrode tab 162. It can be understood that the positive electrode tab 162 and the negative electrode tab 162 are both electrically connected to the surface of the disk body 131 away from the adapter 133.

[0118] See also Figure 17 and Figure 18 The present application further provides an electric device 300, which includes a device body 310 and an energy storage device 100 provided in the present application, and the energy storage device 100 supplies power to the device body 310. It can be understood that the device body 310 is electrically connected to the energy storage device 100.

[0119] In the embodiment of the present application, the disk body 131 of the energy storage device 100 has a guide groove 1311, and the guide groove 1311 gathers and guides the electrolyte to the second liquid outlet 1312, and then the electrolyte is infiltrated into the hollow structure 161 of the electrode assembly 160. The energy storage device 100 can effectively infiltrate the electrolyte and has high safety performance and cycle performance. When the energy storage device 100 supplies power to the device body 310, the energy storage device 100 can provide a stable power supply to the device body 310.

[0120] Optionally, the power-consuming device 300 in the embodiment of the present application may be, but is not limited to, a portable electronic device such as a mobile phone, a tablet computer, a laptop computer, a desktop computer, a smart toy, a smart bracelet, a smart watch, an e-reader, a game console, a toy, etc.; it may also be a large device such as an energy storage battery cabinet, a battery car, an electric car, a ship, a spacecraft, etc. The present application Figure 18 The electrical equipment 300 provided in the embodiment is an energy storage battery cabinet.

[0121] It can be understood that the electric device 300 described in this embodiment is only one form of the electric device 300 used by the battery, and should not be understood as a limitation on the electric device 300 provided in this application, nor should it be understood as a limitation on the batteries provided in various embodiments of this application.

[0122] In this application, the mention of "embodiment" or "implementation manner" means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The appearance of such phrases at various positions in the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments. In addition, it should also be understood that the features, structures or characteristics described in the embodiments of this application may be combined arbitrarily with each other without contradiction to form another embodiment that does not depart from the spirit and scope of the technical solution of this application.

[0123] Finally, it should be noted that the above implementation manners are only used to illustrate the technical solutions of this application and not to limit them. Although the technical solutions of this application have been described in detail with reference to the above preferred implementation manners, those of ordinary skill in the art should understand that the technical solutions of this application may be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of this application.

Claims

1. An energy storage device (100), characterized in that, The energy storage device (100) comprises: An end cover assembly (110), the end cover assembly (110) comprising a top cover (111), a pole (113) and a partition component (112), the top cover (111) comprising a first surface (1111) and a second surface (1112) disposed opposite to each other, the top cover (111) having a liquid injection hole (1113) penetrating the first surface (1111) and the second surface (1112), the partition component (112) being disposed on one side of the second surface (1112) of the top cover (111), and the pole (113) being passed through the partition component (112) and the top cover (111) in sequence. , and is convexly arranged on the first surface (1111); the partition component (112) has a liquid collecting cavity (1121), the liquid collecting cavity (1121) is recessed in the surface of the partition component (112) facing the top cover (111), the partition component (112) also has one or more first liquid discharge holes (1122), the first liquid discharge holes (1122) penetrate the bottom wall of the liquid collecting cavity (1121), and the orthographic projection of the liquid injection hole (1113) on the second surface (1112) falls within the range of the orthographic projection of the liquid collecting cavity (1121) on the second surface (1112); an adapter (130), the adapter (130) being arranged on a side of the partition component (112) facing away from the top cover (111), the adapter (130) comprising a disk body portion (131) and an adapter portion (133) connected to each other, the adapter portion (133) being electrically connected to the end cover assembly (110) and being arranged on a side of the disk body portion (131) close to the top cover (111); the disk body portion (131) having a guide groove (1311), the guide groove (1311) being located on the disk body portion The disc body (131) is provided with a surface facing the top cover (111), the guide groove (1311) is in a spiral structure, the disc body (131) further comprises a second liquid discharge hole (1312) connected to the guide groove (1311), the second liquid discharge hole (1312) is at least partially located at the center of the disc body (131), and the orthographic projection of the first liquid discharge hole (1122) on the surface of the disc body (131) facing the top cover (111) at least partially falls within the range of the guide groove (1311); and An electrode assembly (160), the electrode assembly (160) being electrically connected to an end of the disc body (131) facing away from the adapter portion (133), the electrode assembly (160) being in a wound state and forming a hollow structure (161), and an orthographic projection of the second liquid discharge hole (1312) on a surface of the electrode assembly (160) facing the end cap assembly (110) falling within a range of the hollow structure (161).

2. The energy storage device (100) according to claim 1, characterized in that, The orthographic projection of the first liquid discharge hole (1122) on the second surface (1112) at least partially overlaps with the orthographic projection of the liquid injection hole (1113) on the second surface (1112).

3. The energy storage device (100) according to claim 1, characterized in that, The orthographic projection of the first liquid discharge hole (1122) on the second surface (1112) and the orthographic projection of the second liquid discharge hole (1312) on the second surface (1112) are arranged in a staggered manner.

4. The energy storage device (100) according to claim 1, characterized in that, When the partition component (112) has a plurality of first liquid drain holes (1122), the plurality of first liquid drain holes (1122) are arranged at intervals, and along a direction parallel to the radial direction of the disc body (131), the distance between the two farthest points on the area enclosed by the orthographic projection of any two of the first liquid drain holes (1122) on the second surface (1112) is H1, and the line width of the guide groove (1311) is H2, then the line width H2 of the guide groove (1311) satisfies the range: 0.5 mm ≤ H2 - H1 ≤ 2 mm.

5. The energy storage device (100) according to claim 4, wherein, In a direction parallel to the radial direction of the disc body (131), the distance between the two closest points of any two of the first liquid discharge holes (1122) in the area surrounded by the orthographic projection of the second surface (1112) is H3, and 0.3H2≤H3≤0.5H2 is satisfied.

6. The energy storage device (100) according to claim 4, wherein, The sum of the orthographic projection areas of the plurality of first liquid holes (1122) on the second surface (1112) is S1, and the overlapping area of ​​the orthographic projections of the plurality of first liquid holes (1122) on the second surface (1112) and the orthographic projections of the guide grooves (1311) on the second surface (1112) is S2, and the relationship is satisfied: 0.4≤S2 / S1≤1.

7. The energy storage device (100) according to claim 1, characterized in that, The disc body (131) comprises a main body (1313), wherein the main body (1313) comprises a first part (1314) and a second part (1315) which are connected to each other; a surface of the first part (1314) facing the top cover (111) is recessed in a surface of the second part (1315) facing the top cover (111); a surface of the first part (1314) facing the top cover (111) is arranged farther away from the top cover (111) than a surface of the second part (1315) facing the top cover (111), so as to form the guide groove (1311); a surface of the first part (1314) facing away from the top cover (111) is protruding from a surface of the second part (1315) facing away from the top cover (111).

8. The energy storage device (100) according to claim 7, characterized in that, The disc body (131) further comprises a first boss (1316), the first boss (1316) being arranged around the outer periphery of the main body (1313) and protruding from the surface of the second portion (1315) facing the top cover (111), the first boss (1316) having a first notch (1323), and a portion of the disc body (131) connected to the adapter portion (133) being arranged adjacent to the first notch (1323).

9. The energy storage device (100) according to claim 8, characterized in that, The partition component (112) comprises a partition body portion (1123) and a second boss (1124); the partition body portion (1123) has a liquid collecting chamber (1121); the liquid collecting chamber (1121) is recessed in a surface of the partition body portion (1123) facing the top cover (111); the second boss (1124) is disposed on a surface of the partition body portion (1123) facing away from the top cover (111) and is disposed around the periphery of the partition body portion (1123); the second boss (1124) has a second notch (1125); the disc portion (131) and the adapter portion (132) are connected to each other. 3) The connected portion is arranged adjacent to the second notch (1125); the separating body portion (1123) and the second boss (1124) enclose a receiving groove (140), and the receiving groove (140) is used to receive the disk body portion (131) and the adapter portion (133), wherein the surface of the second boss (1124) facing away from the top cover (111) is flush with the surface of the second portion (1315) facing away from the top cover (111), and the surface of the first boss (1316) facing the top cover (111) abuts against the surface of the separating body portion (1123) facing away from the top cover (111).

10. The energy storage device (100) according to claim 9, wherein The accommodating groove (140) comprises a first accommodating sub-groove (141) and a second accommodating sub-groove (142) which are connected to each other, the first accommodating sub-groove (141) being arranged on a side of the second accommodating sub-groove (142) close to the top cover (111), the first accommodating sub-groove (141) being used to accommodate the adapter portion (133), and the second accommodating sub-groove (142) being used to accommodate the disk body portion (131).

11. The energy storage device (100) according to claim 1, characterized in that, The disc body (131) comprises a main body (1313), and the disc body (131) further comprises a flow-guiding convex ring (1317). The flow-guiding convex ring (1317) is arranged on a surface of the main body (1313) away from the top cover (111) and protrudes in a direction away from the top cover (111). The flow-guiding convex ring (1317) is arranged around the outer periphery of the second liquid discharge hole (1312).

12. The energy storage device (100) according to claim 11, characterized in that, The guide convex ring (1317) has a connected inner peripheral side wall (1318) and an end face (1319); along the thickness direction of the energy storage device (100), the end face (1319) is the surface of the guide convex ring (1317) facing away from the top cover (111); and the connection between the inner peripheral side wall (1318) and the end face (1319) has an arc chamfer.

13. The energy storage device (100) according to claim 11, wherein, The energy storage device (100) further comprises a shell (170), the shell (170) being arranged on one side of the end cover assembly (110) and connected to the shell (170), the shell (170) having a receiving cavity (171) for receiving the electrode assembly (160), and the flow guide convex ring (1317) being at least partially inserted into the hollow structure (161).

14. An electric device (300), the electric device (300) comprising: Device body (310); The energy storage device (100) according to claim 13, wherein the energy storage device (100) supplies power to the device body (310).

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