Energy storage device and electric appliance

Abstract

The application relates to an energy storage device and an electric equipment. The energy storage device comprises an electrode assembly and a first adapter assembly. The electrode assembly comprises a first pole piece. The first adapter assembly comprises a first current collector and a first adapter piece electrically connected. The first adapter piece comprises a first adapter portion, a first bending portion, a connecting portion, a second bending portion and a second adapter portion connected in sequence. The first current collector is arranged on one side of the electrode assembly and is electrically connected to the first pole piece. The connecting portion has a first end and a second end arranged oppositely. The first end is connected to the first bending portion. The second end is connected to the second bending portion. The cross section of the connecting portion along the direction perpendicular to the arrangement direction of the first end and the second end is in an arc structure. The arc structure is convex in the direction away from the electrode assembly. The energy storage device can make full use of the electrolyte stored on the surface of the connecting portion away from the electrode assembly, and improve the utilization rate of the electrolyte of the energy storage device.

Description

Technical Field

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

[0002] A rechargeable battery, also known as a secondary battery or accumulator, is a battery that can be recharged after discharge to reactivate its active materials and continue to be used. The recyclable nature of rechargeable batteries has made them a primary power source for electrical devices. As the demand for rechargeable batteries increases, so do the performance requirements, especially for energy density per unit volume. The volume of the wound electrode assembly is a crucial parameter for improving this energy density. If the wound electrode assembly is too small, there is less active electrode material, resulting in wasted internal space and lower energy density. Conversely, if the wound electrode assembly is too large, it hinders electrolyte wetting, preventing some active materials from functioning effectively. Therefore, a balance must be struck between the volume of the wound electrode assembly and the effectiveness of electrolyte wetting when designing the battery structure.

[0003] To achieve high energy density per unit volume in rechargeable batteries, the wound cell is made as large as possible, with only a very small clearance (typically ±0.25mm) between it and the cylindrical aluminum casing to allow for electrolyte wetting. To improve the wetting effect, the injection hole is usually designed on the negative electrode side, i.e., the side of the current collector with its bent extension. The gap between the plastic under the negative electrode and the bent part of the current collector allows the electrolyte to flow more evenly to the wound electrode assembly, achieving better wetting. However, the current collector obstructs the injection hole on the negative electrode side, and if the electrolyte is injected too quickly, local overflow and backsplashing can easily occur, contaminating the injection hole. This can lead to explosions and flash points during subsequent laser welding of the aluminum cover, posing a safety hazard. Therefore, the design of the injection hole has become one of the important factors restricting the production efficiency of rechargeable batteries. Summary of the Invention

[0004] In view of this, this application provides an energy storage device and an electrical device, wherein the energy storage device can make full use of the electrolyte stored in the first end cap assembly and the first adapter assembly, thereby improving the utilization rate of the electrolyte in the energy storage device.

[0005] This application provides an energy storage device, comprising: an electrode assembly and a first adapter assembly. The electrode assembly includes a first electrode plate. The first adapter assembly includes a first current collector and a first adapter piece electrically connected together. The first adapter piece includes a first adapter portion, a first bending portion, a connecting portion, a second bending portion, and a second adapter portion connected in sequence. The first current collector is disposed on one side of the electrode assembly and is electrically connected to the first electrode plate. The connecting portion has a first end and a second end disposed opposite to each other. The first end is connected to the first bending portion, and the second end is connected to the second bending portion. The cross-section of the connecting portion along a direction perpendicular to the arrangement direction of the first end and the second end is an arched structure, and the arched structure protrudes in a direction away from the electrode assembly.

[0006] Furthermore, the energy storage device also includes a first end cap assembly, which is disposed on the side of the first adapter assembly facing away from the electrode assembly. The first end cap assembly includes a lower plastic part and a first boss, the first boss passing through the lower plastic part and electrically connected to the second adapter portion. The lower plastic part includes a lower plastic body and a protrusion, the protrusion being disposed on the surface of the lower plastic body facing the first adapter assembly and the surface of the protrusion facing the first adapter piece, for abutting against the surface of the connecting portion facing the protrusion. In a direction perpendicular to the arrangement direction of the first end and the second end, the protrusion has two opposite ends, and the end face of the end facing the first adapter assembly is closer to the electrode assembly than the end face of the middle region of the protrusion facing the first adapter assembly.

[0007] Furthermore, the protrusion includes a first sub-protrusion and a second sub-protrusion spaced apart along a first direction. The first sub-protrusion and the second sub-protrusion are respectively used to abut against opposite ends of the connecting portion, so that the connecting portion is recessed toward the direction close to the first end cap assembly. The first direction is perpendicular to the arrangement direction of the first end and the second end, and perpendicular to the thickness direction of the energy storage device.

[0008] Furthermore, the surface of the first sub-bump facing the connecting portion is a plane, and the surface of the second sub-bump facing the connecting portion is a plane; along the thickness direction of the energy storage device, the height d1 of the first sub-bump satisfies the range: 1.5mm≤d1≤3.5mm; the height d2 of the second sub-bump satisfies the range: 1.5mm≤d2≤3.5mm.

[0009] Furthermore, the arched structure is an arc-shaped structure, the protrusion extends along the first direction, and at least part of the surface of the protrusion facing the connecting part is an arc surface. The arc surface is recessed in the direction close to the lower plastic body, and the arc surface fits the surface of the connecting part facing the lower plastic body. The first direction is perpendicular to the arrangement direction of the first end and the second end, and perpendicular to the stacking direction of the first collector plate and the first adapter piece.

[0010] Furthermore, along the first direction, the radius of curvature r1 of the arc surface satisfies the range: 30mm≤r1≤55mm.

[0011] Furthermore, the connecting part includes a connecting body and a flow guide. The connecting body has a first end and a second end disposed opposite to each other. The first end is connected to the first bending part, and the second end is connected to the second bending part. The flow guide is disposed on the surface of the connecting body facing the lower plastic body. The first end and the second end are arranged in a second direction. The flow guide is disposed at intervals along the second direction, and the extension direction of the flow guide intersects with the second direction.

[0012] Furthermore, the flow guiding portion includes a plurality of first flow guiding sub-parts and a plurality of second flow guiding sub-parts; the arrangement direction of the first end and the second end is a second direction, and the first flow guiding sub-parts and the second flow guiding sub-parts are spaced apart along a direction perpendicular to the second direction; the plurality of first flow guiding sub-parts are spaced apart along the second direction and the first flow guiding sub-parts extend along a third direction; the plurality of second flow guiding sub-parts are spaced apart along the second direction and the second flow guiding sub-parts extend along a fourth direction; wherein, the second direction intersects with the third direction, and the second direction intersects with the fourth direction.

[0013] Furthermore, the angle α between the second direction and the third direction satisfies the range: 60°≤α≤80°; the angle β between the second direction and the fourth direction satisfies the range: 60°≤β≤80°; and the angle γ between the third direction and the fourth direction satisfies the range: 120°≤γ≤160°.

[0014] Furthermore, the end of the first guide sub-part near the middle region of the connecting part and the end of the second guide sub-part near the middle region of the connecting part are staggered or arranged side by side along the second direction.

[0015] Furthermore, the connecting portion has a centerline parallel to the second direction, and the ends of the first guide sub-part and the second guide sub-part near the middle region of the connecting portion overlap with the centerline.

[0016] Furthermore, the electrode assembly further includes a second electrode plate, and the energy storage device further includes a second adapter assembly and a second end cap assembly; the second adapter assembly is disposed on the side of the electrode assembly opposite to the first adapter assembly and is electrically connected to the second electrode plate; the electrode assembly is in a wound state and forms a hollow structure; the second end cap assembly is disposed on the side of the second adapter assembly opposite to the electrode assembly; the second adapter assembly partially passes through the second end cap assembly and is electrically connected to the second end cap assembly; the second adapter assembly includes a second collector plate and a second boss; the second boss is disposed on the surface of the second collector plate opposite to the second end cap assembly, and the second boss passes through the second end cap assembly and is exposed on the surface of the second end cap assembly opposite to the electrode assembly; the second adapter assembly has injection holes that respectively penetrate the second collector plate and the second boss; the orthographic projection of the injection holes on the surface of the electrode assembly facing the second end cap assembly falls within the range of the hollow structure.

[0017] Furthermore, the second collector plate and the second boss are an integral structure.

[0018] This application also provides an electrical device, which includes: a device body and an energy storage device provided in this application, wherein the energy storage device supplies power to the device body.

[0019] In this embodiment, when the first adapter assembly and electrode assembly are assembled into the energy storage device, and electrolyte is injected into the energy storage device, a portion of the electrolyte will be stored between the second adapter portion and the connecting portion. The electrolyte then has a certain probability of flowing to the surface of the connecting portion facing the lower plastic part. The connecting portion has an arched cross-section in a direction perpendicular to the arrangement direction of the first and second ends. The arched structure protrudes in a direction away from the electrode assembly. This arched structure allows the electrolyte stored between the second adapter portion and the connecting portion to flow along the arched structure towards the electrode assembly, thus wetting the electrode assembly. The arched structure improves the utilization rate of the electrolyte in the energy storage device, facilitating timely replenishment of electrolyte and ultimately improving the cycle performance of the energy storage device. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the implementation will be briefly introduced below. Obviously, the drawings described below are some implementations of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of an energy storage system according to an embodiment of this application;

[0022] Figure 2 This is a circuit block diagram of an energy storage system according to an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the structure of an energy storage device according to an embodiment of this application;

[0024] Figure 4 This is an exploded structural diagram of an energy storage device according to an embodiment of this application;

[0025] Figure 5 This is a schematic diagram showing the assembly relationship between the first adapter assembly and the first end cap assembly according to an embodiment of this application;

[0026] Figure 6 For this application Figure 5 Exploded structural diagram of the embodiment;

[0027] Figure 7 For this application Figure 5 Cross-sectional view of the embodiment along direction AA in the figure;

[0028] Figure 8 This is a schematic diagram illustrating the assembly relationship between the first adapter assembly and the first end cap assembly according to another embodiment of this application.

[0029] Figure 9 For this application Figure 8 Exploded structural diagram of the embodiment;

[0030] Figure 10 For this application Figure 8 Cross-sectional view of the embodiment along the BB direction in the figure;

[0031] Figure 11 This is a schematic diagram illustrating the assembly relationship between the first adapter assembly and the first end cap assembly according to another embodiment of this application.

[0032] Figure 12 For this application Figure 11 Exploded structural diagram of the embodiment;

[0033] Figure 13 For this application Figure 11 Cross-sectional view of the embodiment along the CC direction in the figure;

[0034] Figure 14 This is a schematic diagram illustrating the assembly relationship between the first adapter assembly and the first end cap assembly according to another embodiment of this application.

[0035] Figure 15 For this application Figure 14 Exploded structural diagram of the embodiment;

[0036] Figure 16This is a schematic diagram illustrating the assembly relationship between the first adapter assembly and the first end cap assembly according to another embodiment of this application.

[0037] Figure 17 For this application Figure 16 Exploded structural diagram of the embodiment;

[0038] Figure 18 This is a schematic diagram of the structure of an energy storage device according to another embodiment of this application;

[0039] Figure 19 This is an exploded structural diagram of an energy storage device according to another embodiment of this application;

[0040] Figure 20 This is a schematic diagram of the structure of a second adapter component according to an embodiment of this application;

[0041] Figure 21 This is a circuit block diagram of an electrical device according to an embodiment of this application;

[0042] Figure 22 This is a schematic diagram of the structure of an electrical device according to an embodiment of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 100 - Energy storage device; 110 - Electrode assembly; 111 - First electrode; 112 - Second electrode; 113 - Hollow structure; 120 - First adapter assembly; 121 - First collector plate; 122 - First adapter piece; 1221 - First adapter section; 1222 - First bending section; 1223 - Second bending section; 1224 - Second adapter section; 123 - Connecting section; 1231 - First end; 1232 - Second end; 1233 - Arc-shaped structure; 1234 - Connecting body; 1235 - Flow guide section; 1236 - First flow guide sub-section; 1237 - Second flow guide sub-section; 1238 - Arch structure; 1239 - Centerline; 130 - First end cap assembly; 131 - Lower plastic part; 13 11-Lower plastic body, 1312-Protrusion, 1313-First sub-protrusion, 1314-Second sub-protrusion, 1315-Arc surface, 1316-First surface, 1317-Second surface, 1318-Third surface, 1319-Fourth surface, 1320-Recess, 1321-End, 133-First boss, 140-Second adapter assembly, 141-Second manifold, 142-Second boss, 143-Injection hole, 150-Housing shell, 151-Receiving cavity, 160-Second end cap assembly, 161-Top cover, 162-Seal, 200-Electrical equipment, 210-Equipment body, 300-Energy storage system, 310-Electrical energy conversion device, 320-User load. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0046] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0047] In this document, references to "embodiment" or "implementation" mean that a particular feature, structure, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] To improve the energy density per unit volume of secondary batteries, the volume of wound electrode assemblies is often increased. However, when the volume of the wound electrode assembly is too large, it will affect the wetting effect of the electrolyte on the wound electrode assembly. To improve the overall wetting effect of the wound electrode assembly, an adapter end is often extended from one end of the current collector to form a gap between the current collector and the top cover, allowing the electrolyte to fill and wet downwards.

[0049] However, in practical applications, electrolyte tends to remain in the gap between the current collector and the top cover, preventing the residual electrolyte from wetting the electrode components. Over time, the electrolyte level in the battery gradually decreases, and the electrolyte remaining between the current collector and the top cover cannot be replenished and wetted in time, resulting in low electrolyte utilization and reduced battery cycle performance. Furthermore, to improve electrolyte wetting, the injection hole is often located on the side of the current collector with a bent extension to ensure even electrolyte flow to the electrode components. However, when the electrolyte injection rate is too fast, the current collector below the injection hole can obstruct the electrolyte flow, causing localized overflow or splashing, which contaminates the injection hole. This can lead to explosions or flash points during subsequent welding of the top cover, creating safety hazards and reducing the battery's safety performance.

[0050] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve energy efficiency, it is necessary to store one form of energy using a medium or device, either in the same form or converted into another, and then release it in a specific energy form for future applications. As is well known, to achieve the major goal of carbon neutrality, the main way to generate green electricity is currently through the development of green energy sources such as photovoltaics and wind power to replace fossil fuels.

[0051] Currently, the generation of green electricity generally relies on solar, wind, and hydropower. However, wind and solar power are generally characterized by strong intermittency and large fluctuations, which can cause grid instability, insufficient power during peak demand periods, and excessive power during off-peak periods. Unstable voltage can also damage the power grid. Therefore, insufficient electricity demand or insufficient grid capacity may lead to the problem of "wind and solar curtailment." Solving these problems requires energy storage. This involves converting electrical energy into other forms of energy through physical or chemical means and storing it. When needed, this energy can be converted back into electrical energy and released. Simply put, energy storage is like a large "power bank," storing electrical energy when solar and wind power are abundant and releasing the stored electricity when needed.

[0052] Taking electrochemical energy storage as an example, this solution provides an energy storage device. The energy storage device is equipped with a chemical battery, which mainly uses the chemical elements in the battery as the energy storage medium. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium. Simply put, the electrical energy generated by wind and solar energy is stored in the chemical battery. When the use of external electrical energy reaches its peak, the stored electricity is released for use, or transferred to places with a shortage of electricity for use.

[0053] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, renewable energy grid-connected energy storage, and user-side energy storage. The corresponding types of energy storage devices include:

[0054] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, enabling load matching of electrical energy in time and space, enhancing the absorption capacity of renewable energy, and playing a significant role in grid system backup, alleviating peak load power supply pressure, and peak regulation and frequency regulation.

[0055] (2) Small and medium-sized energy storage cabinets used in commercial and industrial energy storage scenarios (banks, shopping malls, etc.) and small household energy storage boxes used in residential energy storage scenarios primarily operate under the "peak shaving and valley filling" mode. Because there are significant price differences in electricity consumption during peak and off-peak periods, users with energy storage devices typically charge the cabinets / boxes during off-peak hours to reduce costs; during peak hours, they release the stored electricity for use, thus saving on electricity bills. Furthermore, in remote areas and regions prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices effectively provides backup power for users and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0056] Please see Figure 1 and Figure 2 , Figure 1 This is an application scenario diagram of the energy storage system 300 provided in an embodiment of this application. This application... Figure 1 The embodiments are illustrated using a residential energy storage scenario in user-side energy storage as an example. The energy storage device 100 of this application is not limited to residential energy storage scenarios.

[0057] This application provides an energy storage system 300, which is a residential energy storage system. The energy storage system 300 includes a power conversion device 310, a user load 320, and an energy storage device 100. The power conversion device 310 is electrically connected to both the user load 320 and the energy storage device 100. The power conversion device 310 converts other forms of energy into electrical energy. A portion of the converted electrical energy is stored in the energy storage device 100, and a portion is used to supply power to the user load 320. The energy storage device 100 stores electrical energy and supplies it to the user load 320 during peak electricity price periods. The energy storage system 300 can both convert other forms of energy into electrical energy and store the electrical energy in the energy storage device 100 to supply sufficient electrical energy to the user load 320.

[0058] Understandably, in the energy storage system 300, the power conversion device 310, the user load 320, and the energy storage device 100 are electrically connected to each other.

[0059] Optionally, the power conversion device 310 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electrical energy to provide a stable power supply for the user load 320 and the energy storage device 100.

[0060] Optionally, the energy storage device 100 is a small energy storage box that can be wall-mounted on an outdoor wall.

[0061] Optionally, the power conversion device 310 can be a photovoltaic panel, which can convert solar energy into electrical energy during periods of low electricity prices and store it in the energy storage device 100.

[0062] Optionally, the user load 320 can be a street light or a household appliance, etc. The energy storage device 100 is used to store the electrical energy and supply it to the street light and household appliance during peak electricity prices, or to supply power when the power grid is interrupted / out of service.

[0063] It is understood that the energy storage device 100 may include, but is not limited to, a single battery cell, a battery module, a battery pack, or a battery system. When the energy storage device 100 is a single battery cell, it may be at least one of cylindrical batteries, prismatic batteries, etc.

[0064] Please see Figures 3 to 7 This application provides an energy storage device 100, which includes an electrode assembly 110 and a first adapter assembly 120. The electrode assembly 110 includes a first electrode plate 111; the first adapter assembly 120 includes a first current collector 121 and a first adapter piece 122 electrically connected; the first adapter piece 122 includes a first adapter portion 1221, a first bending portion 1222, a connecting portion 123, a second bending portion 1223, and a second adapter portion 1224 connected in sequence; the first current collector 121 is disposed on one side of the electrode assembly 110 and electrically connected to the first electrode plate 111, and the first adapter portion 1221 is electrically connected to… The first collector plate 121 is connected; the connecting part 123 has a first end 1231 and a second end 1232 arranged opposite to each other. The first end 1231 is connected to the first bending part 1222, and the second end 1232 is connected to the second bending part 1223. The cross-section of the connecting part 123 along the direction perpendicular to the arrangement direction of the first end 1231 and the second end 1232 is an arched structure 1238. The arched structure 1238 protrudes in the direction away from the electrode assembly 110.

[0065] Understandably, the energy storage device 100 also includes an electrolyte (not shown) that at least partially wets the electrode assembly 110.

[0066] Optionally, the energy storage device 100 may 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.

[0067] Understandably, in the embodiments of this application, the first electrode 111, the first collector 121, and the first adapter 122 are arranged sequentially and electrically connected.

[0068] Understandably, the first adapter piece 122 includes a first adapter portion 1221, a first bending portion 1222, a connecting portion 123, a second bending portion 1223, and a second adapter portion 1224 connected in sequence. The first collector plate 121, the first adapter portion 1221, the connecting portion 123, and the second adapter portion 1224 are stacked in sequence. When the first adapter piece 122 is applied to the energy storage device 100, the first adapter piece 122 undergoes a secondary bending. The first adapter portion 1221 and the connecting portion 123 are connected through the first bending portion 1222, and the connecting portion 123 and the second adapter portion 1224 are connected through the second bending portion 1223.

[0069] Understandably, the arched structure 1238 protrudes in a direction away from the electrode assembly 110, which can be that the opening of the arched structure 1238 faces the side closer to the electrode assembly 110.

[0070] Understandably, the connecting part 123 is a plate-shaped structure, which is bent to form the arched structure 1238. Along the direction perpendicular to the arrangement direction of the first end 1231 and the second end 1232, the opposite ends of the connecting part 123 are bent toward the direction close to the electrode assembly 110, and the middle area of ​​the connecting part 123 protrudes toward the direction away from the electrode assembly 110.

[0071] Optionally, in some embodiments, the arched structure 1238 is an arc-shaped structure 1233. In other embodiments, the arched structure 1238 is a folded structure, that is, the opposite ends of the connecting portion 123 are bent towards the electrode assembly 110, and the connecting portion 123 is bent into two connected parts with a fold, such that the cross-section of the connecting portion 123 along the direction perpendicular to the arrangement direction of the first end 1231 and the second end 1232 is a folded structure. In this application, the arched structure 1238 can also be understood as a "roof structure", that is, the opposite ends of the connecting portion 123 are located closer to the electrode assembly 110 than its middle region. This application uses the arc-shaped structure 1233 as an example of the arched structure 1238, and should not be construed as a limitation on "arched structure 1238".

[0072] Optionally, in some embodiments, a protrusion 1312 can be provided in the energy storage device 100 to abut against the surface of the connecting portion 123 facing the protrusion 1312, causing the connecting portion 123 to be deformed by compression, and the cross-section along the direction perpendicular to the arrangement direction of the first end 1231 and the second end 1232 is an arched structure 1238. In other embodiments, the cross-section of the connecting portion 123 along the direction perpendicular to the arrangement direction of the first end 1231 and the second end 1232 can be an arched structure 1238 by means of machining or other methods.

[0073] In this embodiment, when the first adapter component 120 and the electrode component 110 are assembled on the energy storage device 100 and electrolyte is injected into the energy storage device 100, a portion of the electrolyte will be stored in the gap between the second adapter portion 1224 and the connecting portion 123. Then, the electrolyte has a certain probability of flowing to the surface of the connecting portion 123 facing the lower plastic part 131. The cross-section of the connecting portion 123 along the direction perpendicular to the arrangement direction of the first end 1231 and the second end 1232 is an arched structure 1238. The arched structure 1238 protrudes in a direction away from the electrode assembly 110. The arched structure 1238 allows the electrolyte stored between the second transition portion 1224 and the connecting portion 123 to flow along the arched structure 1238 toward the electrode assembly 110 to wet the electrode assembly 110. The arched structure 1238 improves the utilization rate of the electrolyte in the energy storage device 100, which is beneficial for timely replenishment of electrolyte in the energy storage device 100, and ultimately improves the cycle performance of the energy storage device 100.

[0074] Optionally, the energy storage device 100 further includes a housing 150, which is connected to the first end cap assembly 130 and together with the first end cap assembly 130 forms a receiving cavity 151 for receiving the electrode assembly 110.

[0075] Optionally, the first collector plate 121 and the first adapter piece 122 are an integral structure. In some embodiments, the first collector plate 121 and the first adapter piece 122 are first formed separately and then welded into an integral structure, which helps to save raw materials for the first adapter assembly 120. In other embodiments, the first collector plate 121 and the first adapter piece 122 are an integrally formed structure. When the first collector plate 121 and the first adapter piece 122 are an integrally formed structure, it helps to simplify the assembly process of the first adapter assembly 120.

[0076] In some embodiments, the energy storage device 100 further includes a first end cap assembly 130, which is disposed on the side of the first adapter assembly 120 away from the electrode assembly 110. The first end cap assembly 130 includes a lower plastic part 131 and a first boss 133, the first boss 133 passing through the lower plastic part 131 and electrically connected to the second adapter portion 1224. The lower plastic part 131 includes a lower plastic body 1311 and a protrusion 1312, the protrusion 1312 being disposed on the lower plastic body 1311 facing the first adapter portion 1224. The surface of an adapter component 120 has a protrusion 1312 facing the surface of the first adapter piece 122, which is used to abut against the surface of the connecting portion 123 facing the protrusion 1312. The protrusion 1312 has two opposite ends 1321 in a direction perpendicular to the arrangement direction of the first end 1231 and the second end 1232. The end face of the end 1321 facing the first adapter component 120 is closer to the electrode assembly 110 than the end face of the middle region of the protrusion 1312 facing the first adapter component 120.

[0077] Understandably, along the direction perpendicular to the arrangement direction of the first end 1231 and the second end 1232, the protrusion 1312 has two opposite ends 1321. The end face of the end 1321 facing the first adapter assembly 120 is closer to the electrode assembly 110 than the end face of the middle region of the protrusion 1312 facing the first adapter assembly 120. Therefore, along the direction perpendicular to the arrangement direction of the first end 1231 and the second end 1232, the distance from the end face of the protrusion 1312 facing the first adapter assembly 120 to the surface of the lower plastic body 1311 facing the first adapter assembly 120 exhibits a "large-small-large" variation.

[0078] In this embodiment, the first adapter assembly 120 is used to electrically connect the first electrode 111 and the first boss 133 to realize the electrical connection between the electrode assembly 110 and the first end cap assembly 130, and further realize the charging and discharging process of the energy storage device 100. A protrusion 1312 is provided on the surface of the lower plastic body 1311 facing the first adapter assembly 120, and the surface of the protrusion 1312 facing the first adapter piece 122 abuts against the surface of the connecting part 123 facing the protrusion 1312. The protrusion 1312 compresses the connecting part 123, causing the connecting part 123 to deform, thereby making the cross-section of the connecting part 123 along the direction perpendicular to the arrangement direction of the first end 1231 and the second end 1232 an arched structure 1238. The arched structure 1238 protrudes in a direction away from the electrode assembly 110. The arched structure 1238 allows the electrolyte stored between the second transition portion 1224 and the connecting portion 123 to flow along the arched structure 1238 toward the electrode assembly 110 to wet the electrode assembly 110. The arched structure 1238 improves the utilization rate of the electrolyte in the energy storage device 100, which is beneficial for timely replenishment of electrolyte in the energy storage device 100, and ultimately improves the cycle performance of the energy storage device 100.

[0079] Optionally, the first electrode 111 is a negative electrode, the first current collector 121 is a negative current collector, the first adapter 122 is a negative adapter, and the first boss 133 is a negative electrode post.

[0080] In some embodiments, the protrusion 1312 includes a first direction (e.g., Figure 6 As shown in Figure X, a first sub-protrusion 1313 and a second sub-protrusion 1314 are spaced apart. The first sub-protrusion 1313 and the second sub-protrusion 1314 are respectively used to abut against the opposite ends of the connecting portion 123, so that the connecting portion 123 is recessed toward the direction close to the first end cap assembly 130. The first direction is perpendicular to the arrangement direction of the first end 1231 and the second end 1232, and perpendicular to the thickness direction of the energy storage device 100. In other words, the first direction is perpendicular to the arrangement direction of the first end 1231 and the second end 1232, and perpendicular to the stacking direction of the first collector plate 121 and the first adapter plate 122.

[0081] Understandably, the connection portion 123 is recessed toward the direction of the first end cap assembly 130, which can be that the connection portion 123 is recessed toward the direction of the lower plastic body 1311, and is partially located in the gap between the first sub-protrusion 1313 and the second sub-protrusion 1314.

[0082] Understandably, the first sub-protrusion 1313 and the second sub-protrusion 1314 abut against opposite ends of the connecting portion 123. Understandably, the first sub-protrusion 1313 abuts against one end of the connecting portion 123, and the second sub-protrusion 1314 abuts against the other end of the connecting portion 123 away from the first sub-protrusion 1313.

[0083] Understandably, the surface of the first sub-protrusion 1313 facing the connecting portion 123 abuts against the surface of the connecting portion 123 facing the lower plastic part 131, and the surface of the second sub-protrusion 1314 abuts against the surface of the connecting portion 123 facing the lower plastic part 131.

[0084] Understandably, the first sub-protrusion 1313 and the second sub-protrusion 1314 are two opposite ends 1321 of the protrusion 1312. The first sub-protrusion 1313 and the second sub-protrusion 1314 are spaced apart along a direction perpendicular to the arrangement direction of the first end 1231 and the second end 1232, forming a gap between them. The end face of the first sub-protrusion 1313 facing the first adapter assembly 120 is closer to the electrode assembly 110 than the surface of the lower plastic body 1311 facing the first adapter assembly 120. The end face of the second sub-protrusion 1314 facing the first adapter assembly 120 is closer to the electrode assembly 110 than the surface of the lower plastic body 1311 facing the first adapter assembly 120.

[0085] In the energy storage device 100 of this embodiment, when the first adapter assembly 120 and the first end cap assembly 130 are assembled into the energy storage device 100, the first sub-protrusion 1313 and the second sub-protrusion 1314 are sequentially spaced along the first direction. The surface of the first sub-protrusion 1313 facing the first adapter assembly 120 and the surface of the second sub-protrusion 1314 facing the first adapter assembly 120 respectively abut against the surface of the connecting portion 123 facing the protrusion 1312. The first sub-protrusion 1313 and the second sub-protrusion 1314 respectively press the opposite ends of the connecting portion 123, causing the connecting portion 123 to... As the connecting portion 123 is recessed towards the first end cap assembly 130, the opposite ends of the connecting portion 123 extend towards the electrode assembly 110. This allows the electrolyte remaining between the connecting portion 123 and the second transition portion 1224 to flow along the opposite ends of the connecting portion 123 towards the electrode assembly 110, thereby contacting the electrode assembly 110 and being fully utilized. The arched structure 1238 improves the utilization rate of the electrolyte in the energy storage device 100, facilitates timely replenishment of electrolyte in the energy storage device 100, and ultimately improves the cycle performance of the energy storage device 100.

[0086] Optionally, in some embodiments, the thickness H of the energy storage device 100 satisfies the range: 18cm ≤ H ≤ 35cm. Specifically, the value of the thickness H of the energy storage device 100 can be, but is not limited to, 18cm, 19cm, 20cm, 20.3cm, 21cm, 22cm, 23cm, 23.6cm, 24cm, 24.5cm, 25cm, 26cm, 27cm, 27.5cm, 28cm, 29cm, 29.6cm, 30cm, 31cm, 31.2cm, 32cm, 33cm, 34cm, and 35cm. When the thickness H of the energy storage device 100 satisfies 18cm ≤ H ≤ 35cm, the thickness of the energy storage device 100 is within a reasonable range, which is beneficial to the assembly of the energy storage device 100.

[0087] In some embodiments, the surface of the first sub-protrusion 1313 facing the connecting portion 123 is a plane, and the height d1 of the first sub-protrusion 1313 along the thickness direction of the energy storage device 100 satisfies the range: 1.5mm ≤ d1 ≤ 3.5mm. Specifically, the value of the height d1 of the first sub-protrusion 1313 can be, but is not limited to, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, and 3.5mm.

[0088] Understandably, along the stacking direction of the lower plastic body 1311 and the protrusion, the height d1 of the first sub-protrusion 1313 is the height at which the first sub-protrusion 1313 protrudes from the surface of the lower plastic body 1311 facing the electrode assembly 110.

[0089] In this embodiment, the surface of the first sub-protrusion 1313 facing the connecting portion 123 is a plane, such that when the first sub-protrusion 1313 abuts against one end of the connecting portion 123, the direction of the force exerted by the first sub-protrusion 1313 on the connecting portion 123 is parallel to the stacking direction of the lower plastic body 1311 and the protrusion, thus preventing one end of the connecting portion 123 from pressing against the other end of the connecting portion 123 and causing the connecting portion 123 to break due to excessive compression; in addition, the plane helps to simplify the processing procedure of the first sub-protrusion 1313, thereby simplifying the processing procedure of the energy storage device 100. Along the thickness direction of the energy storage device 100, when the height d1 of the first sub-protrusion 1313 satisfies the range of 1.5mm≤d1≤3.5mm, the height of the first sub-protrusion 1313 is within a reasonable range, so that the first sub-protrusion 1313 can abut against the surface of the connecting part 123 facing the lower plastic body 1311, causing the connecting part 123 to bend and form an arc-shaped structure 1233, so that the electrolyte stored between the connecting part 123 and the second adapter 1224 can flow along the arc-shaped structure 1233 towards the direction closer to the electrode assembly 110; in addition, the force exerted by the first sub-protrusion 1313 on the connecting part 123 is within a reasonable range, so that the degree of deformation of the connecting part 123 is within a reasonable range, and the connecting part 123 will not be broken due to excessive compression. When the height d1 of the first sub-bump 1313 is greater than 3.5mm, the height of the first sub-bump 1313 is too large. The first sub-bump 1313 squeezes the connecting part 123 and causes the connecting part 123 to deform too much, which increases the risk of the connecting part 123 breaking due to excessive bending, and increases the production material consumption of the first sub-bump 1313, which is not conducive to saving the production cost of the first sub-bump 1313 and the energy storage device 100. When the height d1 of the first sub-bump 1313 is less than 1.5 mm, the height of the first sub-bump 1313 is too small. The first sub-bump 1313 squeezes the connecting part 123 and the deformation of the connecting part 123 is too small. As a result, the arc-shaped structure 1233 of the connecting part 123 protrudes too little in the direction away from the electrode assembly 110. The electrolyte remaining in the gap between the connecting part 123 and the second adapter 1224 is still difficult to flow along the arc-shaped structure 1233 towards the direction closer to the electrode assembly 110. Consequently, it cannot wet the electrode assembly 110 and replenish the electrolyte in the energy storage device 100 in time, reducing the utilization rate of the electrolyte in the energy storage device 100.

[0090] In some embodiments, the surface of the second sub-protrusion 1314 facing the connecting portion 123 is a plane, and the height d2 of the second sub-protrusion 1314 along the thickness direction of the energy storage device 100 satisfies the range: 1.5mm ≤ d2 ≤ 3.5mm. Specifically, the value of the height d2 of the second sub-protrusion 1314 can be, but is not limited to, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, and 3.5mm.

[0091] Understandably, along the thickness direction of the energy storage device 100, the height d2 of the second sub-bump 1314 is the height by which the second sub-bump 1314 protrudes from the surface of the lower plastic body 1311 facing the electrode assembly 110.

[0092] In this embodiment, the surface of the second sub-protrusion 1314 facing the connecting portion 123 is a plane, such that when the second sub-protrusion 1314 abuts against one end of the connecting portion 123, the direction of the force exerted by the second sub-protrusion 1314 on the connecting portion 123 is parallel to the stacking direction of the lower plastic body 1311 and the protrusion, thus preventing one end of the connecting portion 123 from pressing against the other end of the connecting portion 123 and causing the connecting portion 123 to break due to excessive compression; in addition, the plane helps to simplify the processing procedure of the second sub-protrusion 1314, thereby simplifying the processing procedure of the energy storage device 100. Along the thickness direction of the energy storage device 100, when the height d1 of the second sub-protrusion 1314 satisfies the range of 1.5mm≤d1≤3.5mm, the height of the second sub-protrusion 1314 is within a reasonable range, so that the second sub-protrusion 1314 can abut against the surface of the connecting part 123 facing the lower plastic body 1311, causing the connecting part 123 to bend and form an arc-shaped structure 1233, so that the electrolyte stored between the connecting part 123 and the second adapter 1224 can flow along the arc-shaped structure 1233 towards the direction closer to the electrode assembly 110; in addition, the force exerted by the second sub-protrusion 1314 on the connecting part 123 is within a reasonable range, so that the degree of deformation of the connecting part 123 is within a reasonable range, so that the connecting part 123 will not be broken due to excessive compression. When the height d1 of the second sub-bump 1314 is greater than 3.5mm, the height of the second sub-bump 1314 is too large. The second sub-bump 1314 squeezes the connecting part 123 and causes the connecting part 123 to deform too much, which increases the risk of the connecting part 123 breaking due to excessive bending, and increases the production material consumption of the second sub-bump 1314, which is not conducive to saving the production cost of the second sub-bump 1314 and the energy storage device 100. When the height d1 of the second sub-protrusion 1314 is less than 1.5 mm, the height of the second sub-protrusion 1314 is too small. The second sub-protrusion 1314 squeezes the connecting part 123 and makes the deformation of the connecting part 123 too small. This results in the arc structure 1233 of the connecting part 123 protruding too little in the direction away from the electrode assembly 110. As a result, the electrolyte remaining in the gap between the connecting part 123 and the second adapter 1224 is still difficult to flow along the arc structure 1233 towards the direction closer to the electrode assembly 110. Consequently, it cannot wet the electrode assembly 110 and replenish the electrolyte in the energy storage device 100 in time, reducing the utilization rate of the electrolyte in the energy storage device 100.

[0093] Optionally, in some embodiments, the first sub-protrusion 1313 and the second sub-protrusion 1314 have the same height along the stacking direction of the lower plastic body 1311 and the protrusion.

[0094] In this embodiment, along the stacking direction of the lower plastic body 1311 and the protrusion, the first sub-protrusion 1313 and the second sub-protrusion 1314 have the same height. This makes the force on the opposite ends of the connecting part 123 more uniform when the first sub-protrusion 1313 and the second sub-protrusion 1314 respectively abut against and squeeze the opposite ends of the connecting part 123. This makes the arc-shaped structure 1233 of the connecting part 123 along the cross-section perpendicular to the arrangement direction of the first end 1231 and the second end 1232 symmetrical. This is beneficial for the electrolyte remaining between the connecting part 123 and the second transition part 1224 to flow towards the electrode assembly 110 along the opposite ends of the arc-shaped structure 1233. This makes the electrolyte flow more uniformly to the electrode assembly 110, which is beneficial for improving the wetting effect of the electrolyte and thus improving the charging and discharging performance of the energy storage device 100.

[0095] Optionally, in some embodiments, the protrusion 1312 includes one of a first sub-protrusion 1313 and a second sub-protrusion 1314, the first sub-protrusion 1313 or the second sub-protrusion 1314 abutting against one end of the connecting portion 123 so that the connecting portion 123 is tilted toward the direction of the first end cap assembly 130.

[0096] In an embodiment of this application, the protrusion 1312 includes one of a first sub-protrusion 1313 and a second sub-protrusion 1314. The connecting portion 123 is inclined toward the direction close to the first end cap assembly 130. When electrolyte is injected into the energy storage device 100, the electrolyte will be stored between the second bending portion 1223 and the connecting portion 123. The electrolyte will be on the surface of the connecting portion 123 facing the lower plastic part 131. When the first sub-protrusion 1313 or the second sub-protrusion 1314 abuts against and presses the connecting portion 123, the connecting portion 123 will be recessed towards the direction closer to the first end cap assembly 130. That is, the surface of the connecting portion 123 facing the first end cap assembly 130 is inclined relative to the first end cap assembly 130. The electrolyte stored on the surface of the connecting portion 123 facing the lower plastic part 131 can flow along the connecting portion 123 towards the side closer to the electrode assembly 110 to achieve wetting of the electrode assembly 110. This facilitates timely replenishment of electrolyte into the energy storage device 100, ultimately improving the cycle performance of the energy storage device 100. Compared to the scheme where the protrusion 1312 includes the first sub-protrusion 1313 and the second sub-protrusion 1314, the scheme provided in this embodiment is beneficial for saving raw materials for the first sub-protrusion 1313 and the second sub-protrusion 1314, reducing the production cost and assembly cost of the energy storage device 100.

[0097] Please see Figures 3 to 10In some other embodiments, the arched structure 1238 is an arc-shaped structure 1233, the protrusion 1312 extends along a first direction, and at least part of the surface of the protrusion 1312 facing the connecting portion 123 is an arc surface 1315. The arc surface 1315 is recessed toward the direction close to the lower plastic body 1311, and the arc surface 1315 fits the surface of the connecting portion 123 facing the lower plastic body 1311. The first direction is perpendicular to the arrangement direction of the first end 1231 and the second end 1232, and perpendicular to the stacking direction of the first collector plate 121 and the first adapter piece 122.

[0098] In this embodiment, the arched structure 1238 is an arc-shaped structure 1233, and at least part of the surface of the protrusion 1312 facing the connecting part 123 is an arc surface 1315. This allows the arc surface 1315 to better fit the arc-shaped structure 1233 when the arc-shaped structure 1233 of the connecting part 123 protrudes in a direction away from the electrode assembly 110. The arc surface 1315 provides better support for the arc-shaped structure 1233, allowing the electrolyte remaining between the connecting part 123 and the second transition part 1224 to flow more smoothly along the opposite ends of the arc-shaped structure 1233 towards the electrode assembly 110, thereby wetting the electrode assembly 110. The arc-shaped structure 1233 improves the utilization rate of the electrolyte in the energy storage device 100, which is beneficial for timely replenishment of electrolyte in the energy storage device 100, ultimately improving the cycle performance of the energy storage device 100. Furthermore, the arc surface 1315 provides support for the arc structure 1233, which helps prevent the connecting part 123 from breaking due to excessive bending, and extends the service life of the connecting part 123 and the energy storage device 100.

[0099] In some embodiments, along the first direction, the radius of curvature r1 of the arc surface 1315 satisfies the range: 30mm ≤ r1 ≤ 55mm. Specifically, the value of the radius of curvature r1 of the arc surface 1315 can be, but is not limited to, 30mm, 32mm, 34mm, 36mm, 38mm, 40mm, 41mm, 42mm, 43mm, 45mm, 46mm, 47mm, 48mm, 50mm, 51mm, 52mm, 53mm, 54mm, and 55mm, etc.

[0100] In this embodiment, when the radius of curvature r1 of the arc surface 1315 satisfies the range of 30mm≤r1≤55mm, the radius of curvature of the arc surface 1315 is within a reasonable range. The arc surface 1315 can both support the arc structure 1233 of the connecting part 123 and provide support for the arc structure 1233, so that the electrolyte remaining between the connecting part 123 and the second transition part 1224 can flow more smoothly along the opposite ends of the arc structure 1233 towards the electrode assembly 110 to wet the electrode assembly 110; in addition, the steepness of the arc surface 1315 is within a reasonable range, which helps to limit the steepness of the arc structure 1233 of the connecting part 123, so that the connecting part 123 is not easy to break due to excessive bending. When the radius of curvature r1 of the arc surface 1315 is greater than 55mm, the radius of curvature of the arc surface 1315 is too large, and the arc surface 1315 is relatively flat. When the arc structure 1233 of the connecting part 123 protrudes in the direction away from the electrode assembly 110, the arc surface 1315 will resist and restrict the arc structure 1233 of the connecting part 123, making the arc structure 1233 also relatively flat. That is, the amplitude of the arc structure 1233 of the connecting part 123 protruding in the direction away from the electrode assembly 110 is too small. The electrolyte remaining in the gap between the connecting part 123 and the second transition part 1224 is still difficult to flow along the arc structure 1233 towards the direction closer to the electrode assembly 110, and thus cannot wet the electrode assembly 110 and replenish the electrolyte in the energy storage device 100 in time, reducing the utilization rate of the electrolyte in the energy storage device 100. When the radius of curvature r1 of the arc surface 1315 is less than 30mm, the radius of curvature of the arc surface 1315 is too small, and the arc surface 1315 is too steep. When the arc structure 1233 of the connecting part 123 protrudes in the direction away from the electrode assembly 110, the arc structure 1233 is difficult to support the arc surface 1315, and the arc surface 1315 cannot provide support for the arc structure 1233. When the arc structure 1233 of the connecting part 123 protrudes in the direction away from the electrode assembly 110 and supports the arc surface 1315, the arc structure 1233 is also too steep. That is, the arc structure 1233 of the connecting part 123 protrudes too much in the direction away from the electrode assembly 110, which increases the risk of the connecting part 123 breaking due to excessive bending, and is not conducive to extending the service life of the connecting part 123 and the energy storage device 100.

[0101] Optionally, along the stacking direction of the first collector plate 121 and the first adapter plate 122, the maximum depth h1 of the arc surface 1315 satisfies the range: 0.5mm ≤ h1 ≤ 2.5mm. Specifically, the value of the maximum depth h1 of the arc surface 1315 can be, but is not limited to, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, and 2.5mm. The stacking direction of the first collector plate 121 and the first adapter plate 122 is the thickness direction of the energy storage device 100.

[0102] In this embodiment, along the stacking direction of the first collector plate 121 and the first adapter plate 122, when the maximum depth h1 of the arc surface 1315 satisfies the range of 0.5mm≤h1≤2.5mm, the maximum depth of the arc surface 1315 is within a reasonable range. This allows the arc surface 1315 to support the arc structure 1233 of the connecting part 123 when the first adapter assembly 120 and the first end cap assembly 130 are assembled in the energy storage device 100. This provides support for the arc structure 1233, allowing the electrolyte remaining between the connecting part 123 and the second adapter part 1224 to flow more smoothly along the opposite ends of the arc structure 1233 towards the electrode assembly 110, thereby wetting the electrode assembly 110. Furthermore, the maximum depth of the arc surface 1315 being within a reasonable range helps to limit the steepness of the arc structure 1233 of the connecting part 123, making the connecting part 123 less prone to breakage due to excessive bending. When the maximum depth of the arc surface 1315 is greater than 2.5 mm, the maximum depth of the arc surface 1315 is too large. When the arc structure 1233 of the connecting part 123 protrudes in the direction away from the electrode assembly 110, the arc structure 1233 is difficult to support the arc surface 1315, and the arc surface 1315 cannot provide support for the arc structure 1233. When the arc structure 1233 of the connecting part 123 protrudes in the direction away from the electrode assembly 110 and supports the arc surface 1315, the arc structure 1233 is also too steep. That is, the arc structure 1233 of the connecting part 123 protrudes too much in the direction away from the electrode assembly 110, which increases the risk of the connecting part 123 breaking due to excessive bending, which is not conducive to extending the service life of the connecting part 123 and the energy storage device 100. When the maximum depth of the arc surface 1315 is less than 0.5 mm, the arc surface 1315 is relatively gentle. When the arc structure 1233 of the connecting part 123 protrudes in the direction away from the electrode assembly 110, the arc surface 1315 will resist and restrict the arc structure 1233 of the connecting part 123, making the arc structure 1233 also relatively gentle. That is, the arc structure 1233 of the connecting part 123 protrudes too little in the direction away from the electrode assembly 110. The electrolyte remaining in the gap between the connecting part 123 and the second transition part 1224 is still difficult to flow along the arc structure 1233 towards the direction closer to the electrode assembly 110. As a result, it cannot wet the electrode assembly 110 and replenish the electrolyte in the energy storage device 100 in time, reducing the utilization rate of the electrolyte in the energy storage device 100.

[0103] In some embodiments, along the first direction, the radius of curvature r2 of the arc structure 1233 satisfies the range: 30mm ≤ r2 ≤ 55mm. Specifically, the value of the radius of curvature r2 of the arc structure 1233 can be, but is not limited to, 30mm, 32mm, 34mm, 36mm, 38mm, 40mm, 41mm, 42mm, 43mm, 45mm, 46mm, 47mm, 48mm, 50mm, 51mm, 52mm, 53mm, 54mm, and 55mm, etc.

[0104] In this embodiment, along the first direction, when the radius of curvature r2 of the arc structure 1233 satisfies the range of 30mm≤r2≤55mm, the radius of curvature of the arc structure 1233 is within a reasonable range, so that the electrolyte remaining between the connecting part 123 and the second transition part 1224 can flow along the opposite ends of the arc structure 1233 toward the direction closer to the electrode assembly 110 to wet the electrode assembly 110; in addition, the steepness of the arc structure 1233 is within a reasonable range, so that the connecting part 123 is not easy to break due to excessive bending. When the radius of curvature r2 of the arc structure 1233 is greater than 55mm, the radius of curvature of the arc structure 1233 is too large, and the connecting part 123 is relatively flat. That is, the arc structure 1233 of the connecting part 123 protrudes too little in the direction away from the electrode assembly 110. The electrolyte remaining in the gap between the connecting part 123 and the second transition part 1224 is still difficult to flow along the arc structure 1233 towards the electrode assembly 110. As a result, it cannot wet the electrode assembly 110 and replenish the electrolyte in the energy storage device 100 in time, which reduces the utilization rate of the electrolyte in the energy storage device 100. When the radius of curvature r2 of the arc structure 1233 is less than 30mm, the radius of curvature of the arc structure 1233 is too small, and the arc structure 1233 of the connecting part 123 is too steep. That is, the arc structure 1233 of the connecting part 123 protrudes too much in the direction away from the electrode assembly 110, which increases the risk of the connecting part 123 breaking due to excessive bending, and is not conducive to extending the service life of the connecting part 123 and the energy storage device 100.

[0105] Optionally, along the stacking direction of the first collector plate 121 and the first adapter plate 122, the maximum depth h2 of the arc-shaped structure 1233 satisfies the range: 0.5mm ≤ h2 ≤ 2.5mm. Specifically, the value of the maximum depth h2 of the arc-shaped structure 1233 can be, but is not limited to, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, and 2.5mm. The stacking direction of the first collector plate 121 and the first adapter plate 122 is the thickness direction of the energy storage device 100.

[0106] In this embodiment, along the stacking direction of the first collector plate 121 and the first adapter plate 122, when the maximum depth h2 of the arc-shaped structure 1233 satisfies the range of 0.5mm≤h2≤2.5mm, the maximum depth h2 of the arc-shaped structure 1233 is within a reasonable range, and the extent of the arc-shaped structure 1233 of the connecting part 123 protruding in the direction away from the electrode assembly 110 is within a reasonable range, so that the electrolyte remaining between the connecting part 123 and the second adapter part 1224 can flow along the opposite ends of the arc-shaped structure 1233 towards the direction closer to the electrode assembly 110 to wet the electrode assembly 110; in addition, the steepness of the arc-shaped structure 1233 is within a reasonable range, so that the connecting part 123 is not easy to break due to excessive bending. When the maximum depth of the arc-shaped structure 1233 is greater than 2.5 mm, the arc-shaped structure 1233 of the connecting part 123 protrudes too much in the direction away from the electrode assembly 110, increasing the risk of the connecting part 123 breaking due to excessive bending, which is detrimental to extending the service life of the connecting part 123 and the energy storage device 100. When the maximum depth of the arc-shaped structure 1233 is less than 0.5 mm, the arc-shaped structure 1233 of the connecting part 123 protrudes too little in the direction away from the electrode assembly 110, making it difficult for the electrolyte remaining in the gap between the connecting part 123 and the second transition part 1224 to flow along the arc-shaped structure 1233 towards the electrode assembly 110. Consequently, it cannot wet the electrode assembly 110 and replenish the electrolyte in the energy storage device 100 in a timely manner, reducing the utilization rate of the electrolyte in the energy storage device 100.

[0107] Optionally, in some embodiments, the radius of curvature of the arc surface 1315 along the first direction is the same as the radius of curvature of the arc structure 1233.

[0108] Understandably, if the radius of curvature of the arc surface 1315 is the same as the radius of curvature of the arc structure 1233, then the connecting portion 123 and the arc surface 1315 will be completely fitted together. In this embodiment, when the radius of curvature of the arc surface 1315 is the same as the radius of curvature of the arc structure 1233, the fit between the arc surface 1315 and the connecting portion 123 is improved. The arc surface 1315 can provide better support for the connecting portion 123, allowing the electrolyte remaining between the connecting portion 123 and the second transition portion 1224 to flow more smoothly along the opposite ends of the arc structure 1233 towards the electrode assembly 110, thereby wetting the electrode assembly 110. The arc structure 1233 improves the utilization rate of the electrolyte in the energy storage device 100, which is beneficial for timely replenishment of electrolyte in the energy storage device 100, ultimately improving the cycle performance of the energy storage device 100. In addition, the connecting part 123 is not easily broken due to excessive bending, which extends the service life of the connecting part 123 and the energy storage device 100.

[0109] Please see Figure 3 , Figure 4 , Figures 11 to 13 In other embodiments, the protrusion 1312 extends along a first direction, and along the first direction, the surface of the protrusion 1312 facing the connection portion 123 includes a first surface 1316, a second surface 1317, a third surface 1318, and a fourth surface 1319 connected in sequence; the second surface 1317 is inclined relative to the first surface 1316 in a direction away from the connection portion 123, and the third surface 1318 is inclined relative to the fourth surface 1319 in a direction away from the connection portion 123; the second surface 1317 and the third surface 1318 form a recess 1320, so that when the first end cap assembly 130 is assembled in the energy storage device 100, the connection portion 123 is recessed in a direction away from the electrode assembly 110.

[0110] Understandably, the second surface 1317 and the third surface 1318 form a "V" shape.

[0111] In this embodiment, the second surface 1317 is inclined relative to the first surface 1316 in a direction away from the connecting portion 123, and the third surface 1318 is inclined relative to the fourth surface 1319 in a direction away from the connecting portion 123, such that the second surface 1317 and the third surface 1318 form a recess 1320, such that when the first adapter assembly 120 and the first end cap assembly 130 are assembled into the energy storage device 100, and the arcuate structure 1233 of the connecting portion 123 is inclined relative to the fourth surface 1319 in a direction away from the connecting portion 123, the second surface 1317 and the third surface 1318 form a recess 1320, such that when the first adapter assembly 120 and the first end cap assembly 130 are assembled into the energy storage device 100, the arcuate structure 1233 of the connecting portion 123 is inclined relative to the fourth surface 1319 in a direction away from the connecting portion 123. When the electrode assembly 110 protrudes in the direction described above, the arc-shaped structure 1233 of the connecting portion 123 protrudes more in the direction away from the electrode assembly 110. This allows the electrolyte remaining between the connecting portion 123 and the second transition portion 1224 to flow more smoothly along the opposite ends of the arc-shaped structure 1233 towards the electrode assembly 110, thereby wetting the electrode assembly 110. This facilitates timely replenishment of electrolyte into the energy storage device 100, ultimately improving the cycle performance of the energy storage device 100.

[0112] Optionally, both the second surface 1317 and the third surface 1318 are planes, and the angle θ between the second surface 1317 and the third surface 1318 satisfies the range: 145° ≤ θ ≤ 175°. Specifically, the value of the angle θ between the second surface 1317 and the third surface 1318 can be, but is not limited to, 145°, 148°, 150°, 152°, 156°, 158°, 162°, 164°, 165°, 168°, 169°, 170°, 171°, 172°, 173°, 174°, and 175°.

[0113] In this embodiment, when the angle θ between the second surface 1317 and the third surface 1318 satisfies the range of 145°≤θ≤175°, the angle between the second surface 1317 and the third surface 1318 is within a reasonable range. When the arc-shaped structure 1233 of the connecting portion 123 protrudes in the direction away from the electrode assembly 110, the degree of protrusion of the arc-shaped structure 1233 in the direction away from the electrode assembly 110 is greater, so that the electrolyte remaining in the gap between the connecting portion 123 and the second transition portion 1224 can flow more smoothly along the opposite ends of the arc-shaped structure 1233 towards the direction closer to the electrode assembly 110, so as to wet the electrode assembly 110. When the angle between the second surface 1317 and the third surface 1318 is greater than 175°, the angle is too large, causing the arc-shaped structure 1233 of the connecting portion 123 to bulge excessively in the direction away from the electrode assembly 110, making the connecting portion 123 prone to breakage due to excessive bending. When the angle between the second surface 1317 and the third surface 1318 is less than 145°, the angle is too small, causing the arc-shaped structure 1233 of the connecting portion 123 to bulge insufficiently in the direction away from the electrode assembly 110. The electrolyte remaining in the gap between the connecting portion 123 and the second transition portion 1224 is still difficult to flow along the arc-shaped structure 1233 towards the electrode assembly 110, thus failing to wet the electrode assembly 110 and replenish the electrolyte in the energy storage device 100 in a timely manner, reducing the utilization rate of the electrolyte in the energy storage device 100.

[0114] Optionally, along the stacking direction of the first collector plate 121 and the first adapter piece 122, the maximum depth h3 of the recess 1320 satisfies the range: 1mm ≤ h3 ≤ 2.5mm. Specifically, the value of the maximum depth h3 of the recess 1320 can be, but is not limited to, 1mm, 1.2mm, 1.25mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.65mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.45mm, and 2.5mm.

[0115] In this embodiment, along the stacking direction of the current collector and the first adapter plate 122, when the maximum depth h3 of the recess 1320 satisfies the range 1mm≤h3≤2.5mm, the maximum depth of the recess 1320 is within a reasonable range. When the arc-shaped structure 1233 of the connecting part 123 protrudes in the direction away from the electrode assembly 110, the degree of protrusion of the arc-shaped structure 1233 in the direction away from the electrode assembly 110 is greater, so that the electrolyte remaining between the connecting part 123 and the second adapter 1224 can flow more smoothly along the opposite ends of the arc-shaped structure 1233 towards the direction closer to the electrode assembly 110, so as to wet the electrode assembly 110. When the maximum depth of the recess 1320 is greater than 2.5 mm, the arc-shaped structure 1233 of the connecting part 123 protrudes too much in the direction away from the electrode assembly 110, and the connecting part 123 is prone to breakage due to excessive bending. When the maximum depth of the recess 1320 is less than 1 mm, the angle between the second surface 1317 and the third surface 1318 is too small, making the arc-shaped structure 1233 of the connecting part 123 protrude too little in the direction away from the electrode assembly 110. The electrolyte remaining in the gap between the connecting part 123 and the second transition part 1224 is still difficult to flow along the arc-shaped structure 1233 towards the electrode assembly 110, thus failing to wet the electrode assembly 110 and replenish the electrolyte in the energy storage device 100 in time, reducing the utilization rate of the electrolyte in the energy storage device 100.

[0116] In some embodiments, along the stacking direction of the lower plastic body 1311 and the protrusion, the maximum height d3 of the protrusion 1312 satisfies the range: 1.5mm ≤ d3 ≤ 3.5mm. Specifically, the maximum height d3 of the protrusion 1312 can be, but is not limited to, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, and 3.5mm.

[0117] Understandably, along the stacking direction of the lower plastic body 1311 and the protrusion, the maximum height d3 of the protrusion 1312 is the maximum height of the protrusion 1312 protruding from the surface of the lower plastic body 1311 facing the electrode assembly 110.

[0118] In this embodiment, along the stacking direction of the lower plastic body 1311 and the protrusion, when the maximum height d3 of the protrusion 1312 satisfies the range 1.5mm≤d3≤3.5mm, the maximum height of the protrusion 1312 is within a reasonable range. The protrusion 1312 can both resist and compress the surface of the connecting part 123 facing the protrusion 1312, causing the connecting part 123 to bend and form an arc-shaped structure 1233, so that the electrolyte stored between the connecting part 123 and the second adapter 1224 can flow along the arc-shaped structure 1233 towards the direction closer to the electrode assembly 110; in addition, the force exerted by the protrusion 1312 on the connecting part 123 is within a reasonable range, so that the degree of deformation of the connecting part 123 is within a reasonable range, and the connecting part 123 will not break due to excessive compression. When the maximum height d3 of the protrusion 1312 is greater than 3.5mm, the maximum height of the protrusion 1312 is too large. The protrusion 1312 squeezes the connecting part 123 and causes the connecting part 123 to deform too much, which increases the risk of the connecting part 123 breaking due to excessive bending and increases the production material consumption of the protrusion 1312, which is not conducive to saving the production cost of the protrusion 1312 and the energy storage device 100. When the maximum height d3 of the protrusion 1312 is less than 1.5 mm, the maximum height of the protrusion 1312 is too small. The protrusion 1312 squeezes the connecting part 123 and makes the deformation of the connecting part 123 too small. As a result, the arc structure 1233 of the connecting part 123 protrudes too little in the direction away from the electrode assembly 110. The electrolyte remaining in the gap between the connecting part 123 and the second transition part 1224 is still difficult to flow along the arc structure 1233 towards the direction closer to the electrode assembly 110. Consequently, it cannot wet the electrode assembly 110 and replenish the electrolyte in the energy storage device 100 in time, reducing the utilization rate of the electrolyte in the energy storage device 100.

[0119] Please see Figure 3 , Figure 4 , Figures 8 to 10 as well as Figures 14 to 17 In some embodiments, the connecting portion 123 includes a connecting body 1234 and a guide portion 1235. The connecting body 1234 has a first end 1231 and a second end 1232 disposed opposite to each other. The first end 1231 is connected to the first bending portion 1222, and the second end 1232 is connected to the second bending portion 1223. The guide portion 1235 protrudes from the surface of the connecting body 1234 facing the lower plastic body 1311. The arrangement direction of the first end 1231 and the second end 1232 is a second direction (e.g., Figure 14As shown in the middle Y), the guide portion 1235 is arranged at intervals along the second direction, and the extension direction of the guide portion 1235 intersects the second direction.

[0120] Understandably, if the extension direction of the guide portion 1235 intersects with the second direction, then the guide portion 1235 is inclinedly disposed on the surface of the connecting body 1234 facing the lower plastic body 1311, and the extension direction of the guide portion 1235 intersects with the arrangement direction of the first end 1231 and the second end 1232.

[0121] In this embodiment, when electrolyte is injected into the energy storage device 100, a portion of the electrolyte will be stored between the second adapter 1224 and the connecting portion 123, leaving the electrolyte on the surface of the connecting body 1234 facing the lower plastic body 1311. The connecting body 1234 has an arc-shaped cross-section 1233 along a direction perpendicular to the arrangement direction of the first end 1231 and the second end 1232, allowing the electrolyte to flow towards the electrode assembly 110 via the arc-shaped structure 1233. Furthermore, the flow guides 1235 are spaced apart along the second direction, and the extension direction of the flow guides 1235 intersects the second direction. Thus, the flow guides 1235 can guide the electrolyte remaining in the middle region of the connection 123 to flow along the extension direction of the flow guides 1235 to the edge region of the connection 123, so that the electrolyte flows evenly to the electrode assembly 110, which is beneficial to improving the wetting effect of the electrolyte and also beneficial to improving the utilization rate of the electrolyte by the energy storage device 100.

[0122] Optionally, the guide portion 1235 may be a raised rib, raised strip, or the like protruding from the surface of the connecting body 1234 facing the lower plastic body 1311.

[0123] In this embodiment, by providing ribs and strips on the surface of the connecting body 1234 facing the lower plastic body 1311, when the arc-shaped structure 1233 of the connecting body 1234 protrudes in the direction away from the electrode assembly 110, the electrolyte remaining between the connecting part 123 and the second transition part 1224 flows along the direction of the ribs and strips. The ribs and strips can guide the flow of the electrolyte and serve as the flow guide 1235 of the connecting part 123, so that the electrolyte flows more evenly to the electrode assembly 110, which is beneficial to improving the wetting effect of the electrolyte and also beneficial to improving the utilization rate of the electrolyte in the energy storage device 100.

[0124] In some embodiments, the flow guiding portion 1235 includes a plurality of first flow guiding sub-portions 1236 and a plurality of second flow guiding sub-portions 1237; the arrangement direction of the first end 1231 and the second end 1232 is a second direction, and the first flow guiding sub-portions 1236 and the second flow guiding sub-portions 1237 are spaced apart along a direction perpendicular to the second direction; the plurality of first flow guiding sub-portions 1236 are spaced apart along the second direction and the first flow guiding sub-portions 1236 are along a third direction (e.g., Figure 14 (As shown in the middle Z) extends; a plurality of second guide sub-sections 1237 are spaced apart along the second direction and the second guide sub-sections 1237 extend along the fourth direction; wherein, the second direction intersects with the third direction, and the second direction intersects with the fourth direction (as shown in the middle Z). Figure 14 The two lines intersect (as shown in the middle W).

[0125] In the terminology of this application, "multiple" means "more than or equal to two", and "multiple" can be two, three, or four, etc.

[0126] Understandably, the first flow guide sub-part 1236 and the second flow guide sub-part 1237 are spaced apart along a direction perpendicular to the second direction, and the first flow guide sub-part 1236 and the second flow guide sub-part 1237 are respectively disposed on opposite sides of the connecting body 1234.

[0127] Understandably, the second, third, and fourth directions intersect each other in pairs.

[0128] Understandably, along the second direction, a plurality of first guide sub-sections 1236 are arranged at intervals, and a plurality of second guide sub-sections 1237 are arranged at intervals.

[0129] In this embodiment, the first flow guide sub-part 1236 and the second flow guide sub-part 1237 are spaced apart along a direction perpendicular to the second direction, such that when the arc-shaped structure 1233 of the connecting body 1234 protrudes in a direction away from the electrode assembly 110, the electrolyte remaining between the connecting part 123 and the second transition part 1224 flows along the first flow guide sub-part 1236 and the second flow guide sub-part 1237 toward the direction closer to the electrode assembly 110, which helps to improve the uniformity of the electrolyte flow to the electrode assembly 110 and improve the wetting effect of the electrolyte. Furthermore, compared to the first flow guide sub-section 1236 and the second flow guide sub-section 1237 being arranged parallel to the first direction; or the first flow guide sub-section 1236 and the second flow guide sub-section 1237 being arranged perpendicular to the first direction, with the first flow guide sub-section 1236 extending along a third direction and the second flow guide sub-section 1237 extending along a fourth direction, the guiding effect of the first flow guide sub-section 1236 and the second flow guide sub-section 1237 on the electrolyte is improved. When the arc-shaped structure 1233 of the connecting body 1234 protrudes in a direction away from the electrode assembly 110, the electrolyte remaining between the connecting part 123 and the second transition part 1224 will flow more smoothly to the electrode assembly 110 along the first flow guide sub-section 1236 or the second flow guide sub-section 1237, which is beneficial to improving the wetting efficiency of the electrolyte. Furthermore, the first current guide sub-part 1236 and the second current guide sub-part 1237 are spaced apart along a direction perpendicular to the second direction. This arrangement helps to strengthen the structural strength of the connecting body 1234, making the connecting part 123 less prone to breakage due to bending, and thus extending the service life of the first adapter piece 122 and the energy storage device 100. On the other hand, the first current guide sub-part 1236 and the second current guide sub-part 1237, which are closest to the first end 1231, facilitate bending of the first adapter piece 122 during the assembly of the first adapter assembly 120. This allows the first current collector 121, the first adapter part 1221, and the connecting part 123 to be stacked, improving the regularity of the first adapter assembly 120 within the energy storage device 100.

[0130] Understandably, the first direction is the direction in which the first sub-protrusion 1313 and the second sub-protrusion 1314 are spaced apart, and the first direction is perpendicular to the arrangement direction of the first end 1231 and the second end 1232. Therefore, the first direction is perpendicular to the second direction, intersects with a third direction, and intersects with a fourth direction.

[0131] In some embodiments, the angle α between the second direction and the third direction satisfies the range: 60° ≤ α ≤ 80°. Specifically, the value of the angle α between the second direction and the third direction can be, but is not limited to, 60°, 62°, 63°, 64°, 66°, 68°, 69°, 70°, 71°, 73°, 75°, 76°, 78°, 79°, and 80°.

[0132] In this embodiment, when the angle α between the second direction and the third direction satisfies the range of 60°≤α≤80°, the angle between the second direction and the third direction is within a reasonable range. Therefore, the angle formed by the direction in which the first guide sub-part 1236 extends and the second direction is within a reasonable range. This allows the electrolyte remaining between the connecting part 123 and the second transition part 1224 to flow more smoothly towards the electrode assembly 110 along the first guide sub-part 1236, which is beneficial to improving the wetting efficiency of the electrolyte on the electrode assembly 110. When the angle between the second direction and the third direction is greater than 80°, the angle between the direction in which the first guide sub-part 1236 extends and the second direction is too large, which increases the resistance of the electrolyte flowing along the first guide sub-part 1236 toward the electrode assembly 110. When the arc-shaped structure 1233 of the connecting body 1234 protrudes toward the direction away from the electrode assembly 110, the speed at which the electrolyte flows along the first guide sub-part 1236 toward the electrode assembly 110 becomes slow, reducing the wetting efficiency of the electrolyte on the electrode assembly 110. When the angle between the second direction and the third direction is less than 60°, the angle between the direction in which the first current guide sub-part 1236 extends and the second direction is too small. This results in an excessively large space occupied by multiple first current guide sub-parts 1236 spaced apart along the second direction under the same arrangement density. In other words, the number of first current guide sub-parts 1236 spaced apart along the second direction is reduced under the same space, which weakens the current guiding effect of the first current guide sub-part 1236 on the electrolyte. Consequently, it reduces the speed at which the electrolyte flows along the first current guide sub-part 1236 toward the electrode assembly 110, and reduces the wetting efficiency of the electrolyte on the electrode assembly 110.

[0133] In some embodiments, the angle β between the second direction and the fourth direction satisfies the range: 60° ≤ β ≤ 80°. Specifically, the value of the angle α between the second direction and the third direction can be, but is not limited to, 60°, 62°, 63°, 64°, 66°, 68°, 69°, 70°, 71°, 73°, 75°, 76°, 78°, 79°, and 80°.

[0134] In this embodiment, when the angle α between the second direction and the fourth direction satisfies the range of 60°≤α≤80°, the angle between the second direction and the fourth direction is within a reasonable range. Therefore, the angle formed between the direction in which the second flow guide 1237 extends and the second direction is within a reasonable range. This allows the electrolyte remaining between the connecting part 123 and the second transition part 1224 to flow more smoothly towards the electrode assembly 110 along the second flow guide 1237, which is beneficial to improving the wetting efficiency of the electrolyte on the electrode assembly 110. When the angle between the second direction and the fourth direction is greater than 80°, the angle between the direction in which the second flow guide 1237 extends and the second direction is too large, increasing the resistance to the flow of electrolyte along the second flow guide 1237 toward the electrode assembly 110. When the arc-shaped structure 1233 of the connecting body 1234 protrudes toward the direction away from the electrode assembly 110, the speed at which the electrolyte flows along the second flow guide 1237 toward the electrode assembly 110 becomes slow, reducing the wetting efficiency of the electrolyte on the electrode assembly 110. When the angle between the second direction and the fourth direction is less than 60°, the angle between the direction in which the second current guide portion 1237 extends and the second direction is too small. This results in an excessively large space occupied by multiple second current guide portions 1237 spaced apart along the second direction under the same arrangement density. In other words, the number of second current guide portions 1237 spaced apart along the second direction is reduced under the same space, which weakens the guiding effect of the second current guide portion 1237 on the electrolyte. Consequently, it reduces the speed at which the electrolyte flows along the second current guide portion 1237 toward the electrode assembly 110, and reduces the wetting efficiency of the electrolyte on the electrode assembly 110.

[0135] In some embodiments, the angle γ between the third direction and the fourth direction satisfies the range: 120° ≤ γ ≤ 160°. Specifically, the value of the angle γ between the third direction and the fourth direction can be, but is not limited to, 120°, 122°, 125°, 127°, 130°, 132°, 134°, 136°, 138°, 142°, 146°, 148°, 150°, 153°, 154°, 157°, 159°, and 160°.

[0136] In this embodiment, when the angle γ between the third direction and the fourth direction satisfies the range of 120°≤γ≤160°, the angle between the third direction and the fourth direction is within a reasonable range. Therefore, the angle formed by the extension direction of the first flow guide 1236 and the extension direction of the second flow guide 1237 is within a reasonable range. This allows the electrolyte remaining between the connecting part 123 and the second transition part 1224 to flow more smoothly towards the electrode assembly 110 along the first flow guide 1236 and the second flow guide 1237, which is beneficial to improving the wetting efficiency of the electrolyte on the electrode assembly 110. When the angle γ between the third direction and the fourth direction is greater than 160°, the angle between the third direction and the fourth direction is too large, and the angle formed by the extension direction of the first flow guide 1236 and the extension direction of the second flow guide 1237 is too large. This increases the resistance of the electrolyte flowing along the first flow guide 1236 and the second flow guide 1237 towards the electrode assembly 110. When the arc-shaped structure 1233 of the connecting body 1234 protrudes in the direction away from the electrode assembly 110, the speed at which the electrolyte flows along the second flow guide 1237 towards the electrode assembly 110 becomes slow, reducing the wetting efficiency of the electrolyte on the electrode assembly 110. When the angle γ between the third direction and the fourth direction is less than 120°, the angle between the third direction and the fourth direction is too small. The angle formed by the extension direction of the first guide sub-section 1236 and the extension direction of the second guide sub-section 1237 is too small. This results in a smaller number of first guide sub-sections 1236 and second guide sub-sections 1237 arranged at intervals along the second direction in the same space. This weakens the guiding effect of the first guide sub-sections 1236 and second guide sub-sections 1237 on the electrolyte, thereby reducing the speed at which the electrolyte flows along the first guide sub-sections 1236 and second guide sub-sections 1237 toward the electrode assembly 110, and reducing the wetting efficiency of the electrolyte on the electrode assembly 110.

[0137] In this application Figures 14 to 17 In the embodiment, the end of the first flow guide sub-part 1236 near the middle region of the connecting part 123 and the end of the second flow guide sub-part 1237 near the middle region of the connecting part 123 are arranged alternately or side by side along the second direction.

[0138] In some embodiments, one end of the first flow guide sub-part 1236 near the middle region of the connecting part 123 and one end of the second flow guide sub-part 1237 near the middle region of the connecting part 123 are staggered; in other embodiments, one end of the first flow guide sub-part 1236 near the middle region of the connecting part 123 and one end of the second flow guide sub-part 1237 near the middle region of the connecting part 123 are arranged side by side, in other words, the first flow guide sub-part 1236 and the second flow guide sub-part 1237 are symmetrically arranged. The first flow guide portion 1236 and the second flow guide portion 1237 reduce the resistance of the electrolyte to flow on the surface of the plastic body 1311 facing downward on the connecting body 1234. When the arc-shaped structure 1233 of the connecting body 1234 protrudes in the direction away from the electrode assembly 110, the electrolyte remaining between the connecting portion 123 and the second transition portion 1224 can flow smoothly between the first flow guide portion 1236 and the second flow guide portion 1237, and flow along the first flow guide portion 1236 or the second flow guide portion 1237 to the electrode assembly 110, which is beneficial to improving the wetting efficiency of the electrolyte on the electrode assembly 110.

[0139] exist Figure 14 and Figure 15 In the embodiment, the connecting portion 123 has a center line 1239 parallel to the second direction, and the first guide sub-portion 1236 and the second guide sub-portion 1237 are arranged to overlap with the center line 1239 at one end near the middle region of the connecting portion 123.

[0140] Understandably, the center line 1239 of the connecting portion 123 extends parallel to the second direction, and the center line 1239 of the connecting portion 123 bisects the connecting portion 123 in a direction perpendicular to the second direction.

[0141] In this embodiment, the first guide sub-part 1236 and the second guide sub-part 1237 are arranged to overlap with the center line 1239 at one end near the middle region of the connecting part 123, which strengthens the structural strength of the connecting part 123, prevents the connecting part 123 from breaking due to excessive bending, and helps to extend the service life of the first adapter component 120 and improve the stability of the first adapter component 120 when applied to the energy storage device 100.

[0142] Please see Figures 18 to 20In some embodiments, the electrode assembly 110 further includes a second electrode 112, and the energy storage device 100 further includes a second adapter assembly 140 and a second end cap assembly 160; the second adapter assembly 140 is disposed on the side of the electrode assembly 110 opposite to the first adapter assembly 120 and electrically connected to the second electrode 112, and the second end cap assembly 160 is disposed on the side of the second adapter assembly 140 opposite to the electrode assembly 110; the second adapter assembly 140 partially passes through the second end cap assembly 160 and is electrically connected to the second end cap assembly 160.

[0143] Understandably, the second adapter component 140 serves as an adapter piece for electrically connecting the second end cap component 160 and the electrode component 110, and also as a pole of the second end cap component 160, the pole of the second end cap component 160 being the second boss 142.

[0144] Understandably, the second electrode 112, the second adapter assembly 140, and the second boss 142 are arranged sequentially and electrically connected.

[0145] Understandably, if the second adapter component 140 is partially inserted through the second end cap assembly 160, then the second adapter component 140 is partially exposed on the surface of the second end cap assembly 160 opposite to the second electrode plate 112.

[0146] In this embodiment, the opposite ends of the second adapter component 140 are electrically connected to the second electrode plate 112 and the second end cap component 160, respectively, and the second adapter component 140 is partially inserted through the second end cap component 160, so that the second adapter component 140 can be electrically connected to the external electrical equipment 200 or the external power supply, thereby realizing the connection between the electrical energy inside the energy storage device 100 and the external electrical connection.

[0147] Optionally, in some embodiments, the electrode assembly 110 further includes a diaphragm, wherein the first electrode 111, the diaphragm, and the second diaphragm are stacked sequentially, and the first electrode 111 is electrically connected to the first protrusion 133 of the first end cap assembly 130 through the first adapter assembly 120, and the second electrode 112 is electrically connected to the second protrusion 142 of the second end cap assembly 160 through the second adapter assembly 140, wherein the second electrode 112 is a positive electrode, the second adapter assembly 140 is a positive adapter assembly, the second end cap assembly 160 is a positive end cap assembly, and the second protrusion 142 is a positive electrode post.

[0148] In some embodiments, the second adapter assembly 140 includes a second manifold 141 and a second boss 142. The second boss 142 is disposed on the surface of the second manifold 141 opposite to the second end cap assembly 160. The second boss 142 passes through the second end cap assembly 160 and is exposed on the surface of the second end cap assembly 160 opposite to the electrode assembly 110. The second adapter assembly 140 has injection holes 143 that pass through the second manifold 141 and the second boss 142 respectively. The electrode assembly 110 is in a wound state and forms a hollow structure 113. The injection holes 143 fall within the range of the hollow structure 113 when the orthographic projection of the electrode assembly 110 falls within the range of the orthographic projection of the electrode assembly 110.

[0149] Understandably, the second protrusion 142 is exposed on the surface of the second end cap assembly 160 away from the electrode assembly 110. This can be interpreted as the second protrusion 142 protruding from the surface of the second end cap assembly 160 away from the electrode assembly 110.

[0150] In this embodiment, the injection hole 143 penetrates the second collector plate 141 and the second boss 142. When electrolyte is injected into the injection hole 143, the electrolyte can flow directly to the hollow structure 113 of the electrode assembly 110, achieving rapid wetting of the electrode assembly 110 and improving the electrolyte injection efficiency. Compared to placing the injection hole 143 on the first end cap assembly 130, the electrolyte in this embodiment is not blocked by the second collector plate 141. Even when the electrolyte injection speed is too fast, local overflow or splashing of the electrolyte will not occur, effectively preventing contamination of the injection hole 143 and reducing the risk of explosion or flash point during subsequent welding of the top cover 161, thus improving the safety performance of the battery. Furthermore, the second protrusion 142 passes through the second end cap assembly 160 and is exposed on the surface of the second end cap assembly 160 away from the electrode assembly 110. Thus, the second protrusion 142 protrudes from the surface of the second electrode 112 onto the surface of the second end cap assembly 160 away from the electrode assembly 110. During the welding of the second adapter assembly 140 and the second end cap assembly 160, welding debris will be generated. The second protrusion 142 can prevent any welding debris that may be generated from falling into the energy storage device 100 through the injection hole 143, and can prevent the welding debris from short-circuiting with the electrode assembly 110 and affecting the normal use of the energy storage device 100. In the embodiments of this application, the injection hole 143 penetrates the second collector plate 141 and the second boss 142, and the orthographic projection of the injection hole 143 onto the surface of the electrode assembly 110 facing the second end cap assembly 160 falls within the range of the hollow structure 113. When electrolyte is injected into the energy storage device 100, the electrolyte is injected through the injection hole 143 and directly wets the hollow structure 113 of the electrode assembly 110. Subsequently, the electrolyte wets the electrode assembly 110 along the radial direction of the core cross-section, making the electrolyte wetting more uniform and improving the wetting effect of the electrolyte on the electrode assembly 110. At this time, a portion of the electrolyte will be stored between the first adapter assembly 120 and the first end cap assembly 130. After the energy storage device 100 is formed, the injection hole 143 is welded and sealed, and the energy storage device 100 is inverted for modular encapsulation. Then, the electrolyte remaining between the first adapter assembly 120 and the first end cap assembly 130 can flow along the arc structure 1233 towards the direction closer to the electrode assembly 110 to replenish the electrolyte partially consumed by the energy storage device 100 due to adverse reactions caused by long-term use, thereby ultimately improving the cycle performance of the energy storage device 100.

[0151] In the terminology of this application, "formation" refers to activating a battery by performing its first charge after high-temperature aging. Conventional charging methods include CVC (constant current, constant voltage), typically at 0.1C, 0.2C, or 0.3C (where C refers to the charge / discharge rate).

[0152] Optionally, in some embodiments, the second end cap assembly 160 includes a top cover 161 and a seal 162. The second boss 142 passes through the top cover 161 and is exposed on the surface of the top cover 161 opposite to the electrode assembly 110. The seal 162 closes the injection hole 143 and is connected to the top cover 161. In this embodiment, the seal 162 can close the injection hole 143, thereby sealing the space inside the energy storage device 100.

[0153] In some embodiments, the second collector disk 141 and the second boss 142 are an integral structure.

[0154] In some embodiments, the second collector plate 141 and the second adapter plate are first formed separately and then welded into an integral structure, which helps to save raw materials for the second adapter assembly 140. In other embodiments, the second collector plate 141 and the second boss 142 are integrally formed, which helps to simplify the assembly process of the second adapter assembly 140.

[0155] Please see Figure 21 and Figure 22 This application also provides an electrical device 200, which includes: a device body 210 and an energy storage device 100 provided in this application, wherein the energy storage device 100 supplies power to the device body 210.

[0156] In the embodiments of this application, the energy storage device 100 can fully utilize the electrolyte stored in the first end cap assembly 130 and the first adapter assembly 120, and has a high utilization rate of the electrolyte. The electrolyte has a good wetting effect on the electrode assembly 110, resulting in good cycle performance of the energy storage device 100. When the energy storage device 100 supplies power to the device body 210, it can provide a stable power supply to the device body 210.

[0157] Optionally, the electrical device 200 in this application embodiment can be, but is not limited to, portable electronic devices such as mobile phones, tablets, laptops, desktop computers, smart toys, smart bracelets, smartwatches, e-readers, game consoles, and toys; it can also be large equipment such as energy storage battery cabinets, electric vehicles, electric cars, ships, and spacecraft. Figure 22 The electrical equipment 200 provided in the embodiment is an energy storage battery cabinet.

[0158] It is understood that the electrical equipment described in this embodiment is merely one form of electrical equipment used by the battery, and should not be construed as a limitation on the electrical equipment provided in this application, nor should it be construed as a limitation on the batteries provided in the various embodiments of this application.

[0159] In this application, the terms "embodiment" and "implementation" mean that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of these phrases in various locations throughout the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described in this application can be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the various embodiments of this application can be arbitrarily combined to form another embodiment that does not depart from the spirit and scope of the technical solution of this application, provided there is no contradiction between them.

[0160] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart 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) includes: Electrode assembly (110), the electrode assembly (110) including a first electrode (111); and A first adapter assembly (120) includes a first current collector (121) and a first adapter piece (122) electrically connected; the first adapter piece (122) includes a first adapter portion (1221), a first bending portion (1222), a connecting portion (123), a second bending portion (1223), and a second adapter portion (1224) connected in sequence; the first current collector (121) is disposed on one side of the electrode assembly (110) and electrically connected to the first electrode plate (111); the connecting portion (123) has a first end (1231) and a second end (1232) arranged opposite to each other. The first end (1231) is connected to the first bend (1222), and the second end (1232) is connected to the second bend (1223). The cross-section of the connecting part (123) along the direction perpendicular to the arrangement direction of the first end (1231) and the second end (1232) is an arch structure (1238). The arch structure (1238) protrudes in a direction away from the electrode assembly (110).

2. The energy storage device according to claim 1, characterized in that, The energy storage device (100) further includes a first end cap assembly (130), which is disposed on the side of the first adapter assembly (120) away from the electrode assembly (110). The first end cap assembly (130) includes a lower plastic part (131) and a first boss (133), the first boss (133) passing through the lower plastic part (131) and electrically connected to the second adapter part (1224). The lower plastic part (131) includes a lower plastic body (1311) and a protrusion (1312), the protrusion (1312) being disposed on the lower plastic body (1311) facing the first adapter part (1224). The protrusion (1312) faces the surface of the first adapter piece (122) and abuts against the surface of the connecting part (123) facing the protrusion (1312). The protrusion (1312) has two opposite ends (1321) in a direction perpendicular to the arrangement direction of the first end (1231) and the second end (1232). The end face of the end face (1321) facing the first adapter (120) is closer to the electrode assembly (110) than the end face of the middle region of the protrusion (1312) facing the first adapter (120).

3. The energy storage device (100) according to claim 2, characterized in that, The protrusion (1312) includes a first sub-protrusion (1313) and a second sub-protrusion (1314) spaced apart along a first direction. The first sub-protrusion (1313) and the second sub-protrusion (1314) are respectively used to abut against the opposite ends of the connecting portion (123) so that the connecting portion (123) is recessed toward the direction close to the first end cap assembly (130). The first direction is perpendicular to the arrangement direction of the first end (1231) and the second end (1232) and perpendicular to the thickness direction of the energy storage device (100).

4. The energy storage device (100) according to claim 3, characterized in that, The surface of the first sub-protrusion (1313) facing the connecting part (123) is a plane, and the surface of the second sub-protrusion (1314) facing the connecting part (123) is a plane; along the thickness direction of the energy storage device (100), the height d1 of the first sub-protrusion (1313) satisfies the range: 1.5mm≤d1≤3.5mm; the height d2 of the second sub-protrusion (1314) satisfies the range: 1.5mm≤d2≤3.5mm.

5. The energy storage device (100) according to claim 2, characterized in that, The arched structure (1238) is an arc-shaped structure (1233). The protrusion (1312) extends along a first direction. At least part of the surface of the protrusion (1312) facing the connecting part (123) is an arc surface (1315). The arc surface (1315) is recessed toward the direction close to the lower plastic body (1311). The arc surface (1315) fits the surface of the connecting part (123) facing the lower plastic body (1311). The first direction is perpendicular to the arrangement direction of the first end (1231) and the second end (1232), and perpendicular to the stacking direction of the first collector plate (121) and the first adapter piece (122).

6. The energy storage device (100) according to claim 5, characterized in that, Along the first direction, the radius of curvature r1 of the arc surface (1315) satisfies the range: 30mm≤r1≤55mm.

7. The energy storage device (100) according to claim 2, characterized in that, The connecting part (123) includes a connecting body (1234) and a guide part (1235). The connecting body (1234) has a first end (1231) and a second end (1232) arranged opposite to each other. The first end (1231) is connected to the first bending part (1222), and the second end (1232) is connected to the second bending part (1223). The guide part (1235) protrudes from the surface of the connecting body (1234) facing the lower plastic body (1311). The first end (1231) and the second end (1232) are arranged in a second direction. The guide part (1235) is spaced apart along the second direction. The extension direction of the guide part (1235) intersects with the second direction.

8. The energy storage device (100) according to claim 7, characterized in that, The flow guiding section (1235) includes a plurality of first flow guiding subsections (1236) and a plurality of second flow guiding subsections (1237); the arrangement direction of the first end (1231) and the second end (1232) is a second direction, and the first flow guiding subsections (1236) and the second flow guiding subsections (1237) are spaced apart along a direction perpendicular to the second direction; the plurality of first flow guiding subsections (1236) are spaced apart along the second direction and the first flow guiding subsections (1236) extend along a third direction; the plurality of second flow guiding subsections (1237) are spaced apart along the second direction and the second flow guiding subsections (1237) extend along a fourth direction; wherein, the second direction intersects with the third direction and the second direction intersects with the fourth direction.

9. The energy storage device (100) according to claim 8, characterized in that, The angle α between the second direction and the third direction satisfies the range: 60°≤α≤80°; the angle β between the second direction and the fourth direction satisfies the range: 60°≤β≤80°; the angle γ between the third direction and the fourth direction satisfies the range: 120°≤γ≤160°.

10. The energy storage device (100) according to claim 8, characterized in that, The end of the first flow guide sub-part (1236) near the middle region of the connecting part (123) and the end of the second flow guide sub-part (1237) near the middle region of the connecting part (123) are arranged alternately or side by side along the second direction.

11. The energy storage device according to claim 10, characterized in that, The connecting portion (123) has a center line (1239) parallel to the second direction, and the first guide sub-portion (1236) and the second guide sub-portion (1237) are arranged to overlap with the center line (1239) at one end near the middle region of the connecting portion (123).

12. The energy storage device (100) according to claim 11, characterized in that, The electrode assembly (110) further includes a second electrode (112). The electrode assembly (110) is in a wound state and forms a hollow structure (113). The energy storage device (100) further includes a second adapter assembly (140) and a second end cap assembly (160). The second adapter assembly (140) is disposed on the side of the electrode assembly (110) away from the first adapter assembly (120) and electrically connected to the second electrode (112). The second end cap assembly (160) is disposed on the side of the second adapter assembly (140) away from the electrode assembly (110). The second adapter assembly (140) partially passes through the second end cap assembly (160) and is electrically connected to the second end cap assembly (160). The adapter assembly (140) includes a second manifold (141) and a second boss (142). The second boss (142) is disposed on the surface of the second manifold (141) facing away from the second end cap assembly (160). The second boss (142) passes through the second end cap assembly (160) and is exposed on the surface of the second end cap assembly (160) facing away from the electrode assembly (110). The second adapter assembly (140) has a liquid injection hole (143) that passes through the second manifold (141) and the second boss (142) respectively. The orthographic projection of the liquid injection hole (143) onto the surface of the electrode assembly (110) facing the second end cap assembly (160) falls within the range of the hollow structure (113).

13. The energy storage device (100) according to claim 12, characterized in that, The second collector plate (141) and the second boss (142) are an integral structure.

14. An electrical appliance (200), the electrical appliance (200) comprising: Equipment body (210); as well as The energy storage device (100) according to any one of claims 1 to 13, wherein the energy storage device (100) supplies power to the device body (210).

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