Electrode assembly, battery, battery pack, energy storage device and energy storage system

Abstract

The application relates to an electrode assembly, a battery, a battery pack, an energy storage device and an energy storage system. The electrode assembly comprises an exhaust member and a winding core part wound on the exhaust member; the exhaust member comprises a first structure and a second structure connected to each other, a plurality of first exhaust holes are arranged through the first structure, and a plurality of second exhaust holes are arranged through the second structure; the second structure is arranged on one side of the first structure along a first direction, and a side edge of the second structure along a second direction is connected to a same side edge of the first structure along the second direction, so that an exhaust passage is defined between the first structure and the second structure, the exhaust passage extends along a height direction of the winding core part and is located in the interior of the winding core part, and the exhaust passage is communicated with the first exhaust holes and the second exhaust holes.

Description

Technical Field

[0001] This application relates to the field of batteries, and more particularly to an electrode assembly, a battery, a battery pack, an energy storage device, and an energy storage system. Background Technology

[0002] A rechargeable battery, also known as a rechargeable battery or storage battery, is a battery that can be recharged after being discharged 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, higher requirements are being placed on their energy density, reliability, and safety.

[0003] As a core component of a battery, the electrode assembly is typically a flat cell formed by stacking negative electrode, separator, positive electrode, and separator in sequence and then winding them clockwise or counterclockwise. However, when thermal runaway occurs in a battery, the side reactions in the electrode assembly rapidly generate gas, which leads to a sudden increase in internal gas pressure, making the electrode assembly prone to explosion and resulting in poor battery safety. Utility Model Content

[0004] The purpose of this application is to provide an electrode assembly, battery, battery pack, energy storage device and energy storage system that can release the gas pressure in the electrode assembly in a timely manner during thermal runaway, so as to prevent the electrode assembly from exploding and thus improve the safety of the battery.

[0005] To achieve the above objectives, in a first aspect, this application provides an electrode assembly, including an exhaust member and a core portion wound on the exhaust member; The exhaust component includes a first structure and a second structure that are connected to each other. The first structure has a plurality of first exhaust holes through it, and the second structure has a plurality of second exhaust holes through it. The second structure is stacked on one side of the first structure along the first direction, and the edge of the second structure along the second direction is correspondingly connected to the edge of the first structure along the second direction, so as to define an exhaust channel between the first structure and the second structure. The exhaust channel extends along the height direction of the core portion and is located inside the core portion. The exhaust channel communicates with the first exhaust hole and the second exhaust hole. Among them, the first direction and the second direction are perpendicular to the height direction of the core.

[0006] As an optional implementation, there are two second structures, both of which are stacked on the same side of the first structure along the first direction, and the opposite two sides of the first structure along the second direction are respectively connected to one side edge of the second structure along the second direction.

[0007] As an optional implementation, the two edges of the first structure along the second direction are respectively formed as a first edge portion and a second edge portion; The two second structures are respectively constructed as a first sub-plate and a second sub-plate arranged adjacent to each other along the second direction. The first sub-plate is integrally formed with the first edge portion, and the second sub-plate is integrally formed with the second edge portion.

[0008] As an optional implementation, the first sub-plate has a first mating groove on its edge away from the first edge portion, and the second sub-plate has a second protrusion at its end away from the second edge portion. The second protrusion is accommodated in the first mating groove.

[0009] As an optional implementation, the core portion includes a first diaphragm, a first electrode, a second diaphragm, and a second electrode with the opposite polarity to the first electrode, which are stacked in sequence. The venting member is located on the side of the first diaphragm away from the first electrode and at the winding start end of the first diaphragm.

[0010] As an optional implementation method, At the junction of the first sub-plate and the first edge, the outer surface of the side facing away from the exhaust channel is provided with a rounded corner structure; At the junction of the second sub-plate and the second edge, the outer surface on the side away from the exhaust channel has a rounded corner structure.

[0011] As an optional implementation, in the exhaust component, at least some of the first exhaust holes and the second exhaust holes are staggered.

[0012] As an optional implementation, the exhaust component also includes multiple support columns located in the exhaust channel; One end of the support column is connected to the first structure, and the other end is supported by the second structure.

[0013] As an optional implementation, multiple support columns, multiple first vent holes, and multiple second vent holes are arranged in an array; When the second structure is projected onto the first structure, the projection of any column of second exhaust holes is located between two adjacent columns of first exhaust holes, and the projection of any row of second exhaust holes is located between two adjacent rows of first exhaust holes; and / or In any column of the support columns, a first vent is provided between any two adjacent support columns; in any row of the support columns, a first vent is provided between any two adjacent support columns.

[0014] As an optional implementation, the exhaust component also includes multiple support ribs, which are located in the exhaust channel and extend along the height direction of the core portion. One end of the support rib is connected to the first structure, and the other end is supported by the second structure.

[0015] Secondly, this application discloses a battery that includes the electrode assembly described above.

[0016] Thirdly, this application discloses a battery pack including the aforementioned battery.

[0017] Fourthly, this application discloses an electrical device including the aforementioned battery pack, which is used to supply power to the electrical device.

[0018] Compared with the prior art, the beneficial effects of this application are: In this application, an exhaust device is provided, and the core portion is wound around the exhaust device. The exhaust device includes a first structure and a second structure. The first structure has multiple first exhaust holes, and the second structure has multiple second exhaust holes. An exhaust channel is defined between the first and second structures. The exhaust channel extends along the height direction of the core portion and is located inside the core portion. The exhaust channel communicates with the first and second exhaust holes. In the event of thermal runaway, the reactive gas generated inside the core portion can enter the exhaust channel through the first and second exhaust holes. Since the exhaust channel extends along the height direction of the core portion, the reactive gas can flow along the exhaust channel and be discharged from the core portion from both ends of the exhaust channel. This effectively increases the gas conductivity of the core portion, allowing the gas generated inside the core portion during thermal runaway to be discharged in a timely manner, thereby avoiding explosion accidents caused by a sudden increase in gas pressure inside the electrode assembly and improving battery safety. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the energy storage system provided in the embodiments of this application; Figure 2 This is a schematic diagram of another structure of the energy storage system provided in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the electrode assembly provided in the embodiments of this application; Figure 4 This is a cross-sectional view of the electrode assembly provided in the embodiments of this application; Figure 5 This is a schematic diagram of the exhaust component in the electrode assembly provided in the embodiments of this application; Figure 6 yes Figure 5A magnified view of a section at point A in the middle; Figure 7 This is a cross-sectional view of the electrode assembly provided in an embodiment of this application from another angle; Figure 8 This is a schematic diagram of another structure of the exhaust component in the electrode assembly provided in the embodiments of this application; Figure 9 This is a schematic diagram of the exhaust component in the electrode assembly provided in the embodiments of this application; Figure 10 This is a schematic diagram of the battery structure provided in the embodiments of this application.

[0021] Explanation of reference numerals in the attached figures: 100. Electrode assembly; 101. Exhaust vent; 102. Core winding section; 10. First structure; 11. First edge portion; 12. Second edge portion; 15. First vent; 20. Second structure; 21. First sub-plate; 211. First mating groove; 22. Second sub-plate; 221. Second protrusion; 25. Second vent hole; 26. Rounded corner structure; 30. Support column; Z, exhaust channel; F, first direction; S, second direction; T, height direction of the core section; 200. Battery; 201. Housing; 202. Top cover assembly; 400, Energy storage system; 300, Energy storage device; 410, Power conversion device; 411, First user load; 412, Second user load; 420, High-voltage cable; 421, First power conversion device; 422, Second power conversion device. Detailed Implementation

[0022] 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. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0023] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0024] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0025] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0026] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0027] 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 in the same way or by converting it into another, and then release it in a specific energy form based on future application needs. Currently, the main way to generate green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels.

[0028] 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.

[0029] Taking electrochemical energy storage as an example, an energy storage device can be provided for use in an energy storage system. This energy storage device contains a set of batteries, which mainly use the chemical elements in the batteries 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.

[0030] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, and consumption-side energy storage. The corresponding types of energy storage devices include: (1) Large-scale energy storage power stations applied to wind power and photovoltaic power stations can help renewable energy power generation meet grid connection requirements and improve the utilization rate of renewable energy. As a high-quality active / reactive power regulation power source on the power supply side, energy storage power stations can achieve load matching of power in time and space, enhance the absorption capacity of renewable energy, reduce instantaneous power changes, reduce the impact on the power grid, improve the absorption of new energy power generation, and are of great significance in power grid system backup, alleviating peak load power supply pressure and peak regulation and frequency regulation.

[0031] (2) Energy storage containers applied on the grid side mainly function as peak shaving, frequency regulation and grid congestion relief. In terms of peak shaving, they can realize peak shaving and valley filling of electricity load, that is, charging the energy storage battery when the electricity load is low and releasing the stored electricity during the peak electricity load period, thereby achieving a balance between power production and consumption.

[0032] (3) Small energy storage cabinets applied to the electricity consumption side mainly function as self-consumption of electricity, peak-valley price arbitrage, capacity cost management, and improvement of power supply reliability. Depending on the application scenario, electricity consumption side energy storage can be divided into industrial and commercial energy storage cabinets, household energy storage devices, energy storage charging piles, etc., which are generally used in conjunction with distributed photovoltaics. Industrial and commercial users can use energy storage for peak-valley price arbitrage and capacity cost management. In the electricity market implementing peak-valley pricing, by charging the energy storage system when the electricity price is low and discharging the energy storage system when the electricity price is high, peak-valley price arbitrage can be achieved, reducing electricity costs. In addition, industrial enterprises subject to two-part tariffs can use energy storage systems to store energy during off-peak hours and discharge during peak loads, thereby reducing peak power and the maximum demand declared, achieving the goal of reducing capacity costs. Household photovoltaics with energy storage can improve the level of self-consumption of electricity. Due to high electricity prices and poor power supply stability, the demand for household photovoltaic installations is driven. Given that photovoltaic power generation occurs during the day, while user load is generally higher at night, configuring energy storage can better utilize photovoltaic power, improve self-consumption levels, and reduce electricity costs. Furthermore, energy storage is needed in areas such as communication base stations and data centers for backup power.

[0033] In some embodiments, see Figure 1 , Figure 1 This is a schematic diagram of the energy storage system provided in the embodiments of this application. Figure 1 The embodiments are illustrated using a home energy storage scenario in user-side energy storage as an example. The energy storage device 300 of this application is not limited to the home energy storage scenario.

[0034] This application provides an energy storage system 400, which includes a power conversion device 410 (photovoltaic panel), a first user load 411 (household lighting fixture), a second user load 412 (e.g., household appliances such as air conditioners), and an energy storage device 300. The energy storage device 300 can be a small energy storage box, which can be wall-mounted on an outdoor wall. However, the energy storage device 300 of this application is not limited to wall mounting and can also be placed in a user's residence in other ways. Specifically, the photovoltaic panel can convert solar energy into electrical energy during periods of low electricity prices, and the energy storage device 300 is used to store this electrical energy and supply it to lighting fixtures and household appliances during periods of high electricity prices, or to provide power during power outages / power failures.

[0035] In some embodiments, please refer to Figure 2 , Figure 2 This is a schematic diagram of another structure of the energy storage system provided in an embodiment of this application. Figure 2 The embodiments are illustrated using a shared energy storage scenario on the generation / distribution side as an example. The energy storage device 300 of this application is not limited to its generation / distribution side energy storage scenario.

[0036] The energy storage system 400 provided in this application includes: a high-voltage cable 420, a first power conversion device 421, a second power conversion device 422, and an energy storage device 300 provided in this application. In some embodiments of the power generation scenario, the second power conversion device 422 can be a wind power conversion device. Since the electricity generated by wind power conversion is volatile, random, and intermittent, the unstable electricity output by the wind power conversion device can be stored in the energy storage device 300 through grid connection. The energy storage device 300 is connected to the high-voltage cable 420 and outputs smooth electricity to the power consumption side of the distribution network, realizing peak shaving and frequency regulation, and ensuring stable grid operation. Alternatively, the wind power conversion device is always connected to the high-voltage cable 420. Under normal power generation conditions, the electricity output by the wind power conversion device is supplied to the power consumption side of the distribution network through the high-voltage cable 420. When the current power load is low and the wind power conversion device generates excess electricity, the excess electricity is stored in the energy storage device 300 to reduce wind and solar curtailment rates and improve the problem of new energy power generation consumption. When the electricity load is high, the power grid issues an instruction to transmit the electricity stored in the energy storage device 300 together with the high-voltage cable 420 in grid-connected mode to supply the electricity to the electricity consumption side. This provides the power grid with various services such as peak shaving, frequency regulation, and backup, giving full play to the role of the power grid in peak shaving, promoting peak shaving and valley filling, and alleviating the power supply pressure on the power grid.

[0037] In some embodiments on the distribution network side, the first power conversion device 421 can be a photovoltaic power conversion device. The energy storage device 300 is connected to the high-voltage cable 420 and installed downstream of the high-voltage cable 420 between the user load and the user load. The electrical energy output by the photovoltaic power conversion device is stored in the energy storage device 300, which can act as a backup power source in a timely manner when the power grid / distribution network experiences a fault. Alternatively, it can provide power support to alleviate line congestion when the high-voltage cable 420 transmission line experiences line congestion, and to provide power support during power grid expansion planning to delay the economic pressure caused by power grid / distribution capacity expansion.

[0038] Optionally, the first power conversion device 421 may include, but is not limited to, a photovoltaic power conversion device, and the second power conversion device 422 may include, but is not limited to, a wind power conversion device. The first power conversion device 421 and the second power conversion device 422 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy.

[0039] Optionally, the energy storage device 300 may include, but is not limited to, energy storage applications such as energy storage power stations, hydropower / thermal / wind power generation systems, solar power generation systems, mobile power systems, smart home systems, or temporary power supply systems, and may also be applied in multiple fields such as data centers, military equipment, aerospace, charging piles, and electric vehicles.

[0040] Optionally, the energy storage device 300 may include, but is not limited to, individual batteries, or battery modules, battery packs, battery clusters, power banks, energy storage cabinets / containers, and other battery integrated systems composed of individual batteries. The actual application form of the energy storage device 300 provided in this application embodiment may be, but is not limited to, the listed products, and may also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 300.

[0041] In this embodiment, the energy storage device 300 includes a battery pack, and the battery pack includes a battery, as an example for illustration.

[0042] Batteries in related technologies typically include a casing with an opening and a top cover assembly that seals the opening of the casing, with the electrode assembly encapsulated inside the casing. The electrode assembly is formed by sequentially stacking a negative electrode, a separator, a positive electrode, and a separator, and then winding them clockwise or counterclockwise. Typically, when a battery experiences thermal runaway, the internal temperature rises, and a large amount of gas is generated inside the electrode assembly. If this gas cannot be expelled in time, the internal pressure of the electrode assembly cannot be unloaded and released in a timely manner, making the electrode assembly prone to explosions and other accidents, seriously affecting battery safety.

[0043] In view of this, this application provides an electrode assembly, a battery, a battery pack, an energy storage device, and an energy storage system. By providing an exhaust device with an exhaust channel inside, in the event of thermal runaway, the reactive gas generated inside the winding core can flow along the exhaust channel and be discharged from the winding core from both ends of the exhaust channel. This is equivalent to increasing the gas conductivity of the winding core, allowing the gas generated inside the winding core during thermal runaway to be discharged in a timely manner, thereby avoiding explosion accidents caused by a sudden increase in gas pressure inside the electrode assembly and improving battery safety.

[0044] The following will describe the scheme of this application in detail with reference to the accompanying drawings.

[0045] Please see Figure 3 , Figure 4 and Figure 5 , Figure 3 This is a schematic diagram of the structure of the electrode assembly 100 provided in the embodiments of this application. Figure 4 This is a cross-sectional view of the electrode assembly 100 provided in an embodiment of this application. Figure 5 This is a schematic diagram of the structure of the exhaust component 101 in the electrode assembly 100 provided in the embodiments of this application.

[0046] The first aspect of this application provides an electrode assembly 100, which includes an exhaust member 101 and a core portion 102 wound on the exhaust member 101.

[0047] The venting member 101 includes a first structure 10 and a second structure 20 connected to each other. The first structure 10 has a plurality of first vent holes 15 extending through it, and the second structure 20 has a plurality of second vent holes 25 extending through it. The second structure 20 is stacked on one side of the first structure 10 along the first direction F, and the edge of the second structure 20 along the second direction S corresponds to the edge of the first structure 10 along the second direction S, thereby defining an venting channel Z between the first structure 10 and the second structure 20. The venting channel Z extends along the height direction T of the core portion and is located inside the core portion 102. The venting channel communicates with the first vent holes 15 and the second vent holes 25. Here, the venting member 101 and its internal venting channel Z can extend through the core portion 102 along the height direction T, or the venting member 101 and its internal venting channel Z can only extend a certain length along the height direction T of the core portion, as long as they are located inside the core portion 102.

[0048] In this embodiment of the application, for ease of description, a first direction F and a second direction S are defined in the battery 200, wherein the first direction F, the second direction S, and the height direction T of the winding core are perpendicular to each other.

[0049] In this application, by providing an exhaust member 101, the core portion 102 is wound around the exhaust member 101. The exhaust member 101 includes a first structure 10 and a second structure 20. The first structure 10 is provided with a plurality of first exhaust holes 15, and the second structure 20 is provided with a plurality of second exhaust holes 25. An exhaust channel Z is defined between the first structure 10 and the second structure 20. The exhaust channel Z extends along the height direction T of the core portion 102 and is located inside the core portion 102. The exhaust channel Z communicates with the first exhaust holes 15 and the second exhaust holes 25. In the event of thermal runaway, the reactive gas generated inside the core portion 102 can enter the exhaust channel Z through the first exhaust port 15 and the second exhaust port 25. Since the exhaust channel Z is arranged to run through the core portion 102 along the height direction T, the reactive gas can flow along the exhaust channel Z and be discharged from the core portion 102 from both ends of the exhaust channel Z. This is equivalent to increasing the gas conductivity of the core portion 102, so that the gas generated inside the core portion 102 during thermal runaway can be discharged in time, thereby avoiding the explosion accident caused by the sudden increase in gas pressure inside the electrode assembly 100 and improving the safety of the battery 200.

[0050] In some embodiments, the core portion 102 includes a first diaphragm, a first electrode, a second diaphragm, and a second electrode (not shown) with the opposite polarity to the first electrode, stacked sequentially. The venting member 101 is located on the side of the first diaphragm away from the first electrode and at the starting end of the winding of the first diaphragm. That is, the first diaphragm is the structural layer closest to the venting member 101.

[0051] Please continue reading 3 and... Figure 7 , Figure 7 This is a cross-sectional view of the electrode assembly 100 provided in an embodiment of this application from another angle. The venting member 101 is located approximately at the middle of the core portion 102 along the second direction S. This facilitates uniform venting throughout the core portion 102 along the second direction S.

[0052] Furthermore, the first structure 10 and the second structure 20 in the exhaust component 101 can both be constructed as plates, and the thickness direction of the first structure 10 and the second structure 20 can be along the first direction F, so that the exhaust component 101 can occupy a small space in the first direction F. At this time, the exhaust channel Z can be formed into a roughly elongated space.

[0053] The first structure 10 is provided with a plurality of first exhaust holes 15, for example, the plurality of first exhaust holes 15 can penetrate the first structure 10 along the first direction F. The second structure 20 is provided with a plurality of second exhaust holes 25, for example, the plurality of second exhaust holes 25 can penetrate the second structure 20 along the first direction F. This facilitates the gas generated in the core part 102 to enter the exhaust channel Z more quickly.

[0054] In this application, since the second structure 20 is stacked on one side of the first structure 10 along the first direction F, and the edge of the second structure 20 along the second direction S is correspondingly connected to the edge of the first structure 10 along the second direction S, the surfaces of the second structure 20 and the first structure 10 facing each other in the first direction F form the inner wall of the exhaust channel Z.

[0055] The edge of the second structure 20 along the second direction S is connected to the edge of the first structure 10 along the second direction S by means of welding, for example. Alternatively, the edge of the second structure 20 along the second direction S and the edge of the first structure 10 along the second direction S can be integrally formed. In this solution, the exhaust component 101 can be formed by bending a single piece of material, with the bending line dividing the single piece of material into the first structure 10 and the second structure 20.

[0056] In this embodiment, the number of second structures 20 can be one or more.

[0057] Please see Figure 8 , Figure 8 This is a schematic diagram of another structure of the exhaust element 101 in the electrode assembly 100 provided in this application embodiment. Figure 8 The diagram illustrates the exhaust component 101 in its unfolded state. The exhaust component 101 is formed by bending the second structure 20 clockwise relative to the first structure 10 along a dashed line.

[0058] When there is only one second structure 20, one side edge of the second structure 20 along the second direction S is connected to the same side edge of the first structure 10 along the second direction S. The other side edge of the second structure 20 along the second direction S is also connected to the other side edge of the first structure 10 along the second direction S. Thus, the inner wall of the exhaust channel Z formed by the first structure 10 and the second structure 20 in the circumferential direction of the exhaust channel Z is formed by the first structure 10 and the second structure 20.

[0059] Optionally, one side edge of the second structure 20 along the second direction S is correspondingly connected to the same side edge of the first structure 10 along the second direction S, and the other side edge of the second structure 20 along the second direction S is not connected to the other side edge of the first structure 10 along the second direction S. Thus, the first structure 10 and the second structure 20 are spaced apart, and the exhaust channel Z formed by them is not completely closed in the circumferential direction, having a gap. This gap can be sealed by the core portion 102 wound around the exhaust member 101 in the circumferential direction. This ensures that the exhaust performance of the exhaust channel Z is not affected.

[0060] In this embodiment of the application, the number of second structures 20 may also be two.

[0061] Please see Figure 5 ,exist Figure 5 The diagram illustrates the exhaust component 101 in its unfolded state and its structural schematic diagram in normal use. In some embodiments, two second structures 20 are stacked on the same side of the first structure 10 along the first direction F, and the opposite side edges of the first structure 10 along the second direction S are respectively connected to one side edge of the second structure 20 along the second direction S. Thus, the opposing surfaces of the two second structures 20 and the first structure 10 along the first direction F form the inner wall of the exhaust channel Z.

[0062] In some embodiments, the two edges of the first structure 10 along the second direction S are respectively formed as a first edge portion 11 and a second edge portion 12. The two second structures 20 are respectively constructed as a first sub-plate 21 and a second sub-plate 22 arranged adjacently along the second direction S, with the first sub-plate 21 integrally formed with the first edge portion 11 and the second sub-plate 22 integrally formed with the second edge portion 12. Further, the ends of the first sub-plate 21 opposite to the first edge portion 11 and the ends of the second sub-plate 22 opposite to the second edge portion 12 can be connected to each other.

[0063] The first sub-plate 21 and the first edge portion 11 are integrally formed, and the second sub-plate 22 and the second edge portion 12 are integrally formed. Thus, the first structure 10, the first sub-plate 21, and the second sub-plate 22 can actually be integrally formed from a single piece of material. For example, for... Figure 5 In the unfolded state shown, along the two lines indicated by the single-dot dashed lines, the first sub-plate 21 rotates clockwise relative to the first structure 10, and the second sub-plate 22 rotates counterclockwise relative to the first structure 10 until it contacts the first sub-plate 21. The ends of the first sub-plate 21 facing away from the first edge 11 and the ends of the second sub-plate 22 facing away from the second edge 12 are then connected. Alternatively, in some embodiments, the dimensions of the first sub-plate 21, the first structure 10, and the second sub-plate 22 along the height direction T of the core portion can be equal, meaning the entire sheet material has equal dimensions along the height direction T of the core portion, forming a strip of uniform width. This facilitates processing on the production line.

[0064] With this structure, the connection position of the first sub-plate 21 and the second sub-plate 22 can avoid the corner position of the core part 102, and the influence of the exhaust component 101 on the first diaphragm at the corner position of the core part 102 can be avoided.

[0065] Please combine Figure 5 and Figure 6 Please refer to it. Figure 6 yes Figure 5 A partial enlarged view at point A. The connection between the first sub-plate 21 and the second sub-plate 22 can be achieved through bonding or other methods. Furthermore, to minimize the impact of this connection on the first diaphragm, in some embodiments, the edge of the first sub-plate 21 facing away from the first edge 11 has a first mating groove 211, and the end of the second sub-plate 22 facing away from the second edge 12 has a second protrusion 221. The second protrusion 221 is accommodated in the first mating groove 211. In some embodiments, the surface of the first sub-plate 21 facing away from the second structure 20 and the surface of the second sub-plate 22 facing away from the second structure 20 can be flush with each other. This ensures that the surfaces of the first sub-plate 21 and the second sub-plate 22 facing the first diaphragm are relatively smooth after connection, avoiding impact on the core portion 102. The first mating groove 211 formed on the first sub-plate 21 can extend along the height direction T of the core portion. The first mating groove 211 can be provided on the surface of the first sub-plate 21 that is away from the first structure 10. In this way, after the second sub-plate 22 rotates counterclockwise, the second protrusion 221 can directly enter the first mating groove 211.

[0066] Please refer to the following in this application: Figure 5As mentioned above, the venting component 101 is located on the side of the first diaphragm away from the first electrode sheet and at the starting end of the winding of the first diaphragm. After winding, the two ends of the venting component 101 along the second direction S correspond to the corners of the core portion 102. In some embodiments, at the junction of the first sub-plate 21 and the first edge portion 11, the outer surface on the side away from the venting channel Z is provided with a rounded corner structure 26. At the junction of the second sub-plate 22 and the second edge portion 12, the outer surface on the side away from the venting channel Z is also provided with a rounded corner structure 26. This is because the materials of the first electrode sheet and the second electrode sheet contain hard particles. During the winding process, the hard material at the innermost corner position is prone to puncturing the diaphragm, resulting in a short circuit. By setting the rounded corner structure 26, an arc surface with a similar degree of curvature is provided to the electrode sheet at the corner of the core portion 102 for support, which can alleviate the situation of the diaphragm being punctured to a certain extent.

[0067] Please see Figure 9 , Figure 9 This is a schematic diagram of the exhaust element 101 in the electrode assembly 100 provided in this application embodiment. For ease of observation and positioning, the first exhaust hole 15 on the first structure 10 is thickened, and the first exhaust hole 15 and the support column 30 are also shown on the second structure 20. In some embodiments, at least some of the first exhaust holes 15 and second exhaust holes 25 in the exhaust element 101 are staggered; this arrangement can prevent airflow collision to a certain extent. Preferably, all the first exhaust holes 15 and all the second exhaust holes 25 are staggered.

[0068] Understandably, to ensure the stability of the exhaust channel Z formed by the first structure 10 and the second structure 20 and to prevent the exhaust channel Z from collapsing during the winding of the core portion 102, a support structure can be considered to be provided within the exhaust channel Z. In some embodiments, the exhaust member 101 further includes a plurality of support columns 30 located within the exhaust channel Z. One end of each support column 30 is connected to the first structure 10, and the other end is supported by the second structure 20. It should be noted that each support column 30 needs to be staggered from both the first exhaust hole 15 and the second exhaust hole 25.

[0069] In order to ensure that the support columns 30 can reliably and uniformly support the first structure 10 and the second structure 20, in some embodiments, the support columns 30 are arranged in an array, and the column direction of the array is along the height direction T of the core portion.

[0070] Similarly, in order to ensure the uniformity of exhaust inside the core portion 102, in some embodiments, the first exhaust hole 15 and the second exhaust hole 25 are also arranged in an array.

[0071] In some embodiments, when the second structure 20 is projected onto the first structure 10, the projection of any column of the second exhaust holes 25 is located between two adjacent columns of the first exhaust holes 15, and the projection of any row of the second exhaust holes 25 is located between two adjacent rows of the first exhaust holes 15.

[0072] For example, please see Figure 9 Please see Figure 9 The projection of the second exhaust hole 25 in the first column is located between the first exhaust hole 15 in the first column and the second exhaust hole 15 in the second column. The line SS1 connecting the centers of the projections of the second exhaust holes 25 in the first column, the line LL1 connecting the centers of the first exhaust holes 15 in the first column, and the line LL2 connecting the centers of the first exhaust holes 15 in the second column satisfy the condition that the distances between SS1 and LL1 and LL2 are equal. The arrangement of the second exhaust holes 25 and the first exhaust holes 15 in the remaining columns follows a similar pattern and will not be elaborated further here.

[0073] Similarly, the projection of the second exhaust hole 25 in the first row is located between the first exhaust hole 15 in the first row and the first exhaust hole 15 in the second row. The line S1 connecting the centers of the projections of the second exhaust holes 25 in the first row, the line L1 connecting the centers of the first exhaust holes 15 in the first row, and the line L2 connecting the centers of the first exhaust holes 15 in the second row satisfy the following condition: the distances between S1 and L1 and L2 are equal. The arrangement of the second exhaust holes 25 and the first exhaust holes 15 in the remaining rows follows a similar pattern and will not be elaborated further here.

[0074] In some embodiments, in any column of the support columns 30, a first vent hole 15 is provided between every two adjacent support columns 30; similarly, in any row of the support columns 30, a first vent hole 15 is provided between every two adjacent support columns 30. This arrangement ensures that, except for the outermost first vent hole 15, each first vent hole 15 is surrounded by four support columns 30, and each second vent hole 25 is also surrounded by four support columns 30. This allows the support columns 30 to provide better support for the exhaust channel Z.

[0075] In another possible implementation, the exhaust member 101 may further include multiple support ribs (not shown), which are located in the exhaust channel Z and extend along the height direction T of the core portion. One end of each support rib is connected to the first structure 10, and the other end is supported by the second structure 20. Compared with the support column 30, the support ribs offer better support and are easier to manufacture.

[0076] Please see Figure 10 , Figure 10 This is a schematic diagram of the structure of the battery 200 provided in the embodiment of this application.

[0077] This application also discloses a battery 200, which includes the electrode assembly 100 as described in any of the above claims and has all of its beneficial effects, which will not be repeated here. In this application, the battery 200 can be a cylindrical battery, a prismatic battery, etc.

[0078] In addition, generally, the battery 200 also includes a housing 201 with an opening and a top cover assembly 202, the top cover assembly 202 being closed at the opening of the housing 201, and the electrode assembly 100 being located inside the housing 201.

[0079] This application also discloses a battery pack including at least one battery 200 as described above. The battery pack has all the beneficial effects of the battery 200 in the foregoing embodiments, which will not be repeated here.

[0080] This application also discloses an energy storage device, including the battery pack described above. The energy storage device described above possesses all the beneficial effects of the battery pack in the foregoing embodiments, which will not be repeated here.

[0081] This application also discloses an energy storage system, including the energy storage device described above. The above-described energy storage system has all the beneficial effects of the energy storage device in the foregoing embodiments, which will not be repeated here.

[0082] 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 them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An electrode assembly, characterized in that, Includes an exhaust component and a core portion wound on the exhaust component; The exhaust component includes a first structure and a second structure connected to each other. The first structure has a plurality of first exhaust holes through it, and the second structure has a plurality of second exhaust holes through it. The second structure is stacked on one side of the first structure along the first direction, and the edge of the second structure along the second direction is correspondingly connected to the edge of the first structure along the second direction, so as to define an exhaust channel between the first structure and the second structure. The exhaust channel extends along the height direction of the core portion and is located inside the core portion. The exhaust channel communicates with the first exhaust hole and the second exhaust hole. The first direction and the second direction are perpendicular to the height direction of the core portion.

2. The electrode assembly according to claim 1, characterized in that, There are two second structures, which are stacked on the same side of the first structure along the first direction, and the opposite two sides of the first structure along the second direction are respectively connected to one side edge of the second structure along the second direction.

3. The electrode assembly according to claim 2, characterized in that, The two edges of the first structure along the second direction are respectively formed as a first edge portion and a second edge portion; The two second structures are respectively configured as a first sub-plate and a second sub-plate arranged adjacent to each other along the second direction. The first sub-plate is integrally formed with the first edge portion, and the second sub-plate is integrally formed with the second edge portion.

4. The electrode assembly according to claim 3, characterized in that, The first sub-plate has a first mating groove on its edge away from the first edge portion, and the second sub-plate has a second protrusion on its end away from the second edge portion. The second protrusion is accommodated in the first mating groove.

5. The electrode assembly according to claim 3, characterized in that, The core portion includes a first diaphragm, a first electrode, a second diaphragm, and a second electrode with the opposite polarity to the first electrode, which are stacked in sequence. The venting member is located on the side of the first diaphragm away from the first electrode and at the starting end of the winding of the first diaphragm.

6. The electrode assembly according to claim 5, characterized in that, At the junction of the first sub-plate and the first edge portion, the outer surface of the side facing away from the exhaust channel is provided with a rounded corner structure; At the junction of the second sub-plate and the second edge portion, the outer surface of the side facing away from the exhaust channel is provided with a rounded corner structure.

7. The electrode assembly according to any one of claims 1-6, characterized in that, In the exhaust component, at least a portion of the first exhaust port and the second exhaust port are staggered.

8. The electrode assembly according to any one of claims 1-6, characterized in that, The exhaust component also includes a plurality of support columns, which are located in the exhaust channel; One end of the support column is connected to the first structure, and the other end is supported by the second structure.

9. The electrode assembly according to claim 8, characterized in that, The multiple support columns, the multiple first exhaust holes, and the multiple second exhaust holes are all arranged in an array; When the second structure is projected onto the first structure, the projection of any column of the second exhaust holes is located between two adjacent columns of the first exhaust holes, and the projection of any row of the second exhaust holes is located between two adjacent rows of the first exhaust holes; and / or In any column of the support columns, a first vent hole is provided between two adjacent support columns; in any row of the support columns, a first vent hole is provided between two adjacent support columns.

10. The electrode assembly according to any one of claims 1-6, characterized in that, The exhaust component also includes multiple support ribs, which are located in the exhaust channel and extend along the height direction of the core portion; One end of the support rib is connected to the first structure, and the other end is supported by the second structure.

11. A battery, characterized in that, The battery includes an electrode assembly as described in any one of claims 1-10.

12. A battery pack, characterized in that, Includes at least one battery as described in claim 11.

13. An energy storage device, characterized in that, Includes the battery pack as described in claim 12.

14. An energy storage system, characterized in that, Includes the energy storage device as described in claim 13.

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