Top cover assembly, battery, battery pack, energy storage device and energy storage system

Abstract

The application relates to a top cover assembly, a battery, a battery pack, an energy storage device and an energy storage system. The top cover assembly comprises a top cover, a lower insulating piece arranged on the surface of the top cover, a pole column arranged through the top cover and the lower insulating piece, and a connecting piece arranged on the side of the lower insulating piece away from the top cover, wherein the connecting piece is connected with the pole column, and a plurality of welding areas are further arranged on the connecting piece, the welding areas are configured to be welded and connected with the tab of an electrode assembly, and the plurality of welding areas have gaps with the lower insulating piece along the thickness direction of the top cover assembly. The top cover assembly, the battery, the battery pack, the energy storage device and the energy storage system of the application have the gaps between the welding areas on the connecting piece and the lower insulating piece, so that the welding heat is prevented from being directly conducted to the lower insulating piece, and the reliability of the battery is improved.

Description

Technical Field

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

[0002] In the traditional assembly process of secondary batteries, the connecting piece is usually first connected to the terminal post as a single unit. Then, the terminal post is passed through the lower insulator and the top cover, and connected to the top cover. At this point, the connecting piece is located on the side of the lower plastic component furthest from the top cover. In subsequent assembly processes, the connecting piece is also connected to the tabs of the electrode assembly by welding. During this welding process, the high heat generated can damage the structural stability of the lower insulator, which also affects the reliability of the battery. Summary of the Invention

[0003] The purpose of this application is to provide a top cover assembly, battery, battery pack, energy storage device, and energy storage system that improves battery reliability by creating a gap between the welding area of ​​the connecting piece and the lower insulating component, thus preventing welding heat from being directly conducted from the welding area to the lower insulating component.

[0004] To achieve the above objectives, in a first aspect, this application provides a cover assembly, comprising:

[0005] Top cover;

[0006] Lower insulating component, which is disposed on the surface of the top cover;

[0007] The pole, passing through the top cover and the lower insulation; and,

[0008] The connecting piece is located on the side of the lower insulator opposite to the top cover. The connecting piece is connected to the pole post, and the connecting piece is also provided with multiple welding areas, which are configured to be welded to the tabs of the electrode assembly.

[0009] Among them, multiple welding areas and the lower insulating component have gaps along the thickness direction of the top cover assembly.

[0010] As an optional implementation, the top cover assembly also includes multiple support members, which together with the pole post support the connecting piece to suspend the welding area along the thickness direction of the top cover assembly and support it on the lower insulating member.

[0011] As an alternative implementation, the support is connected to one of the lower insulating member and the connecting piece, and presses against the other of the lower insulating member and the connecting piece.

[0012] As an optional implementation, the connecting piece includes a connecting structure, which is connected to the pole post;

[0013] The support components include main support components, and each welding area corresponds to at least one main support component;

[0014] The main support is located on the side of the corresponding welding area away from the connecting structure.

[0015] As an optional implementation, there are two welding zones, and the connection structure is located between the two welding zones;

[0016] The main support components corresponding to the two welding zones are located on opposite sides of the two welding zones.

[0017] As an optional implementation, the connecting piece has a connecting hole, and the pole is fixedly connected to the connecting hole, forming a connecting structure; or,

[0018] The pole is fixedly connected to the side surface of the connecting piece facing the top cover, and the part of the connecting piece that is welded to the pole forms a connection structure.

[0019] As an optional implementation, one end of the main support member is connected to the connecting piece, and the other end is pressed against and supported by the lower insulating member. When the connecting piece and the main support member are projected along the thickness direction of the top cover assembly, the projection of the main support member is outside the projection range of the connecting piece.

[0020] As an alternative implementation, one end of the main support member along the thickness direction of the top cover assembly is integrally connected to the connecting piece, and the other end is pressed against the lower insulating member.

[0021] As an optional implementation, the main support member includes a straight portion and a bent portion connected to each other, the straight portion being parallel to the connecting piece, and the bent portion being bent relative to the connecting piece toward the top cover.

[0022] The straight section presses against the lower insulating component;

[0023] The bent portion is integrally connected to the connecting piece along the height direction of the top cover assembly, away from the edge of the straight portion.

[0024] As an optional implementation, a first direction and a second direction are defined in the top cover assembly, the first direction and the second direction being perpendicular to each other in the thickness direction of the top cover assembly;

[0025] The main support member extends continuously along the first direction; or,

[0026] The main support component has multiple hollowed-out notches to divide it into multiple sub-support parts, which are arranged at intervals along the first direction.

[0027] As an optional implementation, the surface of the main support member that presses against the lower insulating member is provided with a plurality of recessed structures; and / or,

[0028] The surface of the main support member that presses against the lower insulating member is provided with a heat-insulating coating; and / or,

[0029] A heat-insulating gasket is provided between the surface of the main support member that presses against the lower insulation member and the lower insulation member.

[0030] As an optional implementation, the main support member is located on the lower insulating member;

[0031] One part of the main support structure is supported between the opposing surfaces of the lower insulator and the connecting piece, while the other part extends beyond the opposing area of ​​the lower insulator and the connecting piece.

[0032] As an optional implementation, a first direction and a second direction are defined in the top cover assembly, the first direction and the second direction being perpendicular to each other in the thickness direction of the top cover assembly;

[0033] The main support component is constructed as a strip extending along the first direction.

[0034] As an optional implementation, there are multiple main support members, which are arranged at intervals along the second direction.

[0035] As an alternative implementation, the main support member is constructed as a strip-shaped closed ring, and the main support member is sleeved on the end of the welding area of ​​the connecting piece that is away from the connecting structure.

[0036] As an optional implementation, the support also includes auxiliary support members, with at least one auxiliary support member corresponding to each welding area;

[0037] The auxiliary support is placed between the corresponding welding area and the connecting structure.

[0038] As an optional implementation, the auxiliary support is located on the lower insulating member;

[0039] One part of the auxiliary support structure is located in the area opposite to the lower insulator and the connecting piece, while the other part extends beyond the area opposite to the lower insulator and the connecting piece.

[0040] As an optional implementation, a first direction and a second direction are defined in the top cover assembly, the first direction and the second direction being perpendicular to each other in the thickness direction of the top cover assembly;

[0041] The auxiliary support and main support corresponding to the same welding zone are located on both sides of the welding zone along the second direction, respectively.

[0042] Both the auxiliary support and the main support are constructed as strips extending along the first direction.

[0043] Secondly, this application also provides a battery, including a housing, an electrode assembly, and the top cover assembly as described above;

[0044] The housing and top cover assembly together enclose a receiving cavity, and the electrode assembly is housed within the receiving cavity.

[0045] Thirdly, this application also provides a battery pack including at least one battery as described above.

[0046] Fourthly, this application also provides an energy storage device, including the battery pack described above.

[0047] Fifthly, this application also provides an energy storage system, including the energy storage device described above.

[0048] Compared with the prior art, the beneficial effects of this application are:

[0049] In this application, the welding area is the area where the welding heat is most concentrated during the welding process on the connecting piece. The gap between the welding area and the lower insulating component along the thickness direction of the top cover assembly serves as a heat insulation function, which can largely prevent the welding heat in the welding area from being directly conducted to the lower insulating component, thus preventing the lower insulating component from being deformed or even melted due to heat, thereby improving the reliability of the battery. Attached Figure Description

[0050] 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.

[0051] Figure 1 This is a schematic diagram of the energy storage system provided in the embodiments of this application;

[0052] Figure 2 This is a schematic diagram of another structure of the energy storage system provided in the embodiments of this application;

[0053] Figure 3 This is a schematic diagram of the top cover assembly provided in an embodiment of this application;

[0054] Figure 4 This is a schematic diagram of another structure of the top cover assembly provided in the embodiments of this application;

[0055] Figure 5 This is a side view of the connecting piece in the top cover assembly provided in this application embodiment;

[0056] Figure 6 This is a schematic diagram of another structure of the connecting piece in the top cover assembly provided in this application embodiment;

[0057] Figure 7 This is a schematic diagram of another structure of the top cover assembly provided in the embodiments of this application;

[0058] Figure 8This is a schematic diagram of another structure of the top cover assembly provided in the embodiments of this application;

[0059] Figure 9 This is a schematic diagram of another structure of the top cover assembly provided in the embodiments of this application;

[0060] Figure 10 This is a schematic diagram of the battery structure provided in the embodiments of this application.

[0061] Explanation of reference numerals in the attached figures:

[0062] 100. Top cover assembly;

[0063] 10. Top cover;

[0064] 20. Lower insulation component; 30. Pole post;

[0065] 50. Connecting piece; 501. Welding area; 502. Connecting hole; 51. Connecting structure;

[0066] 60. Support component; 61. Main support component; 610. Hollowed-out notch; 6100. Sub-support section; 611. Straight section; 612. Bending section; 62. Auxiliary support component;

[0067] F, First direction; S, Second direction; T, Thickness direction of the top cover assembly;

[0068] 200. Battery; 201. Electrode assembly; 2011. Tab; 202. Housing;

[0069] 300. Energy storage devices;

[0070] 400. Energy storage system; 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

[0071] 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.

[0072] 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.

[0073] Furthermore, some of the aforementioned terms, besides indicating location or positional relationships, may also have other meanings. For example, the term "above" may, in certain circumstances, indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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:

[0080] (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.

[0081] (2) Energy storage containers applied on the grid side mainly function as peak shaving, frequency regulation and relief of grid congestion. 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 period of electricity load, thereby achieving a balance between power production and consumption.

[0082] (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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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 peak shaving role of the power grid, promoting peak shaving and valley filling, and alleviating the power supply pressure of the power grid.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] Optionally, when the energy storage device 300 is a single battery, the energy storage device 300 can be, but is not limited to, at least one of cylindrical, square, prismatic, or other shaped batteries.

[0092] Optionally, the battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application does not specifically limit it.

[0093] In this embodiment, the energy storage device includes a battery pack, and the battery pack includes a battery, as an example for illustration.

[0094] In traditional battery structures, the top cover assembly is connected to the housing, encapsulating the electrode assembly inside the housing. The top cover assembly typically includes a top cover, terminals, and a lower insulator. In traditional battery assembly, the connecting tab is usually first connected to the terminals, then the terminals are passed through the lower insulator and top cover and connected to the top cover. At this point, the connecting tab is located on the side of the lower plastic assembly furthest from the top cover. In subsequent assembly, the connecting tab is also welded to the tabs of the electrode assembly. During this welding process, the welding heat generated in the welding area on the connecting tab is directly conducted to the corresponding position on the lower insulator, causing the lower insulator to deform or even melt due to heat. This severely compromises the structural stability of the lower insulator, affecting battery reliability.

[0095] In view of this, this application provides a top cover assembly, a battery, a battery pack, an energy storage device, and an energy storage system, which provides a gap between the welding area on the connecting piece and the lower insulating component, thereby preventing welding heat from being directly conducted to the lower insulating component and improving the reliability of the battery.

[0096] The following will describe the scheme of this application in detail with reference to the accompanying drawings.

[0097] Please see Figure 3 , Figure 3 This is a structural schematic diagram of the top cover assembly 100 provided in an embodiment of this application. Figure 3 In the example, for ease of explanation, the connecting piece 50 is partially magnified. Figure 3An example is shown in the upper right corner of the central image.

[0098] In a first aspect, this application discloses a top cover assembly 100, including: a top cover 10, a lower insulating member 20, a pole post 30, and a connecting piece 50.

[0099] A lower insulating member 20 is disposed on the surface of the top cover 10. An electrode post 30 passes through the top cover 10 and the lower insulating member 20. A connecting piece 50 is located on the side of the lower insulating member 20 facing away from the top cover 10. The connecting piece 50 is connected to the electrode post 30, and the connecting piece 50 has multiple welding areas 501 configured to be welded to the tabs 2011 of the electrode assembly 201. The multiple welding areas 501 have gaps from the lower insulating member 20 along the thickness direction T of the top cover assembly.

[0100] In this application, the welding area 501 is the area on the connecting piece 50 where the welding heat is most concentrated during the welding process. The welding area 501 and the lower insulating part 20 have a gap along the thickness direction T of the top cover assembly. This gap serves as a heat insulation function, which can largely prevent the welding heat of the welding area 501 from being directly conducted to the lower insulating part 20, thus preventing the lower insulating part 20 from being deformed or even melted by heat, thereby improving the reliability of the battery.

[0101] In addition, it is understandable that the gap between the welding area 501 and the lower insulating component 20 is generally filled with a gas medium. The thermal conductivity of the gas medium is relatively small compared with that of the connecting piece 50 and the lower insulating component 20. Therefore, the setting of this gap can play a significant role in heat insulation.

[0102] In this application, for ease of explanation, a first direction F and a second direction S are defined in the top cover assembly 100, wherein the first direction F and the second direction S are perpendicular to the thickness direction T of the top cover assembly. For example, the dimension of the top cover assembly 100 along the first direction F is larger than the dimension of the top cover assembly 100 along the second direction S.

[0103] The lower insulating member 20 can be disposed on the surface of the top cover 10 facing the electrode assembly 201. It serves to insulate and support the electrode assembly 201. The connecting piece 50 is provided with multiple welding areas 501, which may be, for example, portions of the connecting piece 50 used for welding to the tabs 2011 of the electrode assembly 201. The number of welding areas 501 can be set according to actual needs. Figure 3 In the example, a connecting piece 50 with two welding areas 501 is used for illustration. The two welding areas 501 can be arranged along the second direction S, and the connecting structure 51 along the second direction S can be located between the two welding areas 501. The shape of the connecting piece 50 can be determined according to the welding position of the tab 2011. In this application, a rectangular shape of the connecting piece 50 is used as an example for illustration. In this case, the connecting piece 50 can be a sheet extending along the second direction S in the length direction.

[0104] In some embodiments, the top cover assembly 100 further includes a plurality of support members 60, which, together with the pole post 30, support the connecting piece 50 to suspend the welding area 501 along the thickness direction T of the top cover assembly above the lower insulating member 20. Further, at least a portion of the structure of the support member 60 may be supported between the connecting piece 50 and the lower insulating member 20.

[0105] In this application, the top cover assembly 100 also includes a plurality of support members 60, which together with the pole post 30 support the connecting piece 50 to suspend the welding area 501 along the thickness direction T of the top cover assembly and support it on the lower insulating member 20. In other words, the welding area 501 on the connecting piece 50 is suspended relative to the lower insulating member 20, thereby enabling a gap to exist between the welding area 501 and the lower insulating member 20 along the thickness direction T of the top cover assembly.

[0106] As mentioned above, the terminal post 30 passes through the top cover 10 and the lower insulating member 20, and the connecting piece 50 is connected to the terminal post 30. Therefore, the terminal post 30 can support the connecting piece 50. Furthermore, the support member 60 also supports the connecting piece 50. For example, at least a part of the structure of the support member 60 can support the connecting piece 50 and the lower insulating member 20. In this application, both the terminal post 30 and the support member 60 support the connecting piece at the same time, which has a better support effect. During the welding process, when it is necessary to use tooling to press the connecting piece 50 for welding, the connecting piece 50 can be well supported to prevent it from deforming. This ensures that the welding of the connecting piece 50 and the tab 2011 can be carried out smoothly, thereby improving the welding reliability of the battery.

[0107] The support of the support member 60 for the connecting piece 50 can be, for example, as described later. Figure 7 As shown, a portion of the support member 60 is supported between the connecting piece 50 and the lower insulating member 20, and another portion extends beyond the relative range of the connecting piece 50 and the lower insulating member 20, or it can be as follows: Figure 3 As shown, one end of the support member 60 is connected to the connecting piece 50, and the other end is connected to the lower insulating member 20. The entire support member 60 serves a supporting function. The support member 60 and the pole post 30 jointly support the connecting piece 50, meaning that the support member 60 and the pole post 30 support the connecting piece 50 at different positions. For example, the support member 60 and the pole post 30 may support the connecting piece 50 around the welding area 501. In some embodiments, the support member 60 and the pole post 30 may support the connecting piece 50 on opposite sides of the welding area 501, or they may support the connecting piece 50 on the same side of the welding area 501. Thus, the connecting piece 50 is supported at least in two different positions.

[0108] In this embodiment, the support member 60 is connected to one of the lower insulating member 20 and the connecting piece 50, and presses against and supports the other of the lower insulating member 20 and the connecting piece 50. Thus, the connecting piece 50 only needs to be connected to one of the lower insulating member 20 and the connecting piece 50, simplifying the manufacturing process. In some embodiments, the support member 60 can be integrally connected to the connecting piece 50. This allows the support member 60 to be integrally formed during the fabrication of the connecting piece 50, with the side of the support member 60 facing away from the connecting piece 50 supporting the lower insulating member 20, thus providing good support for the connecting piece 50. Alternatively, the support member 60 can be integrally connected to the lower insulating member 20. This allows the support member 60 to be integrally formed during the fabrication of the lower insulating member 20, with the side of the support member 60 facing away from the lower insulating member 20 supporting the connecting piece 50, also providing good support for the connecting piece 50.

[0109] In one embodiment, the connecting piece 50 includes a connecting structure 51, which is connected to the pole post 30. Figure 3 In the example, the pole post 30 is obscured by the connecting piece 50 and is therefore shown as a dashed line. The support member 60 includes a main support member 61, with at least one main support member 61 corresponding to each welding area 501. The main support member 61 is supported on the side of the corresponding welding area 501 opposite to the connecting structure 51. This arrangement ensures optimal support for the welding area 501, with the main support member 61 supporting the connecting piece 50 and the pole post 30 supporting the connecting piece 50 located on opposite sides of the welding area 501.

[0110] Furthermore, in Figure 3 In the example, there can be two welding areas 501, located on two different sides of the connecting structure 51, that is, the connecting structure 51 is located between the two welding areas 501. The main support members 61 corresponding to the two welding areas 501 are located on opposite sides of the two welding areas 501. In this way, the support positions of the two main support members 61 and the pole post 30 on the connecting piece 50 are located on opposite sides of the two welding areas 501 and between the two welding areas 501, forming three support positions, which provides the best support effect for the two welding areas 501.

[0111] In this embodiment of the application, the connection method between the connecting piece 50 and the pole post 30 can be, for example, as follows: Figure 3 As shown, the pole post 30 is fixedly connected to the side surface of the connecting piece 50 facing the top cover 10, and the portion of the connecting piece 50 that is welded to the pole post 30 forms a connection structure 51. Here, the welding of the pole post 30 and the connecting piece 50 can be achieved, for example, by through welding on the side of the connecting piece 50 away from the top cover 10, forming a connection structure 51 as shown by the dotted line in the figure.

[0112] Figure 4This is a schematic diagram of another structure of the top cover assembly 100 provided in the embodiments of this application. Figure 5 This is a side view of the connecting piece 50 in the top cover assembly 100 provided in this application embodiment.

[0113] Please see Figure 4 In another possible implementation, the connecting piece 50 may have a connecting hole 502, and the pole post 30 is fixedly connected to the connecting hole 502, forming a connecting structure 51. With this configuration, the connecting piece 50 and the pole post 30 can also be welded on the side of the connecting piece 50 away from the top cover 10.

[0114] Please refer to the embodiments in this application. Figure 3 In one embodiment, one end of the main support member 61 is connected to the connecting piece 50, and the other end presses against and supports the lower insulating member 20. The main support member 61 is located outside the area directly opposite the lower insulating member 20 and the connecting piece 50. That is, when the connecting piece 50 and the main support member 61 are projected along the thickness direction T of the top cover assembly, the projection of the main support member 61 is outside the projection range of the connecting piece 50. This arrangement allows the main support member 61 to be as far away as possible from the welding area 501 on the connecting piece 50. This further prevents the welding heat from the welding area 501, which is the core area of ​​welding heat, from being transferred to the lower insulating member 20 through the support member 60.

[0115] Furthermore, please combine Figure 3 and Figure 5 One end of the main support member 61 along the thickness direction T of the top cover assembly is integrally connected to the connecting piece 50, and the other end presses against the lower insulating member 20. This arrangement allows the support member 60 to be integrally formed during the fabrication of the connecting piece 50, and the side of the support member 60 facing away from the connecting piece 50 can be supported on the lower insulating member 20, thus achieving good support for the connecting piece 50. Further, the main support member 61 includes a straight portion 611 and a bent portion 612 connected to each other. The straight portion 611 is parallel to the connecting piece 50, and the bent portion 612 is bent relative to the connecting piece 50 towards the top cover 10. The straight portion 611 presses against the lower insulating member 20, and the bent portion 612 is integrally connected to the connecting piece 50 along the height direction of the top cover assembly 100, away from the edge of the straight portion 611. With this configuration, when forming the connecting piece 50 and the main support member 61, a single sheet of material can be bent downwards at the bending portion 612 to form the main support member 61, making the formation process and structure relatively simple. In this case, the main support member 61 can be constructed as a thin-walled component.

[0116] Figure 6 This is a schematic diagram of another structure of the connecting piece 50 in the top cover assembly 100 provided in this application embodiment.

[0117] Please combine Figure 3 , Figure 5 ,and Figure 6 Referring to the embodiments, in some implementations, the main support member 61 may extend continuously along the first direction F. Alternatively, the main support member 61 may have multiple hollowed-out notches 610 to divide it into multiple sub-support portions 6100, which are spaced apart along the first direction F. This arrangement allows each sub-support portion 6100 to have a smaller contact area with the lower insulating member 20.

[0118] In this embodiment, to further reduce the transfer of welding heat, a plurality of recessed structures can be provided on the surface of the main support member 61 that presses against the lower insulating member 20. For example, the surface of the main support member 61 that presses against the lower insulating member 20 can be made into a rough, frosted surface. Alternatively, the surface of the main support member 61 that presses against the lower insulating member 20 can be machined into a structure with tiny protrusions or grooves by mechanical processing methods, such as etching. This can significantly reduce the actual contact area, thereby reducing heat transfer efficiency. For example, a micron-scale mesh structure can be machined on this surface, reducing the contact area between the main support member 61 and the lower insulating member 20 to 10% of the original. Alternatively, laser surface treatment technology can be used to form micro / nano structures on the surface of the main support member 61 that presses against the lower insulating member 20. These micro / nano structures can reduce the heat transfer path, thereby reducing heat transfer efficiency. For example, forming a micron-scale recessed structure on the surface of the main support member 61 that presses against the lower insulating member 20 by laser surface treatment can effectively reduce the contact area.

[0119] In some embodiments, a heat-insulating coating may be provided on the surface of the main support member 61 that presses against the lower insulator 20 to minimize the transfer of welding heat. For example, a material with a high melting point and low thermal conductivity (e.g., a ceramic coating or a PI polymer coating) may be sprayed onto the surface of the main support member 61 that presses against the lower insulator 20. This heat-insulating coating can effectively block heat transfer and prevent the lower insulator from melting. Alternatively, a heat-insulating gasket (not shown) may be provided between the surface of the main support member 61 that presses against the lower insulator 20 and the lower insulator 20 to minimize the transfer of welding heat.

[0120] Figure 7 This is a schematic diagram of another structure of the top cover assembly 100 provided in the embodiments of this application. Figure 8 This is a schematic diagram of another structure of the top cover assembly 100 provided in the embodiments of this application.

[0121] Please see Figure 4 , Figure 7 and Figure 8As another possible implementation, the main support member 61 can be disposed on the lower insulating member 20 and press against the connecting piece 50 for support. For example, the main support member 61 can be integrally disposed on the lower insulating member 20. Further, a portion of the main support member 61 is supported between the opposing surfaces of the lower insulating member 20 and the connecting piece 50, while another portion extends beyond the opposing (opposite along the thickness direction T of the top cover assembly) areas of the lower insulating member 20 and the connecting piece 50. With this arrangement, the portion of the main support member 61 located between the lower insulating member 20 and the connecting piece 50 can form a support, and the portion of the main support member 61 extending beyond the opposing areas of the lower insulating member 20 and the connecting piece 50 can strengthen the lower insulating member 20. It is understood that, in this embodiment, the arrangement of the welding area 501 and the connecting structure 51 is similar to... Figure 3 The examples shown are similar, so they will not be repeated here.

[0122] Furthermore, the main support member 61 is constructed as a strip extending along the first direction F. In this way, on the one hand, during electrolyte injection through the injection port, the main support member 61 can guide the electrolyte along the first direction F; on the other hand, during thermal runaway, the main support member 61 can guide the gas along the first direction F. When there are multiple main support members 61, and multiple support members 60 are arranged at intervals along the second direction S, adjacent support members 60 can also form gas channels during thermal runaway and electrolyte flow channels during electrolyte injection.

[0123] Figure 9 This is a schematic diagram of another structure of the top cover assembly 100 provided in this application embodiment. Please refer to the embodiments in this application. Figure 9 The main support member 61 can be constructed as a strip-shaped closed ring, and the main support member 61 is sleeved on the end of the welding area 501 of the connecting piece 50 that is away from the connecting structure 51. Thus, the portion of the support member 60 located between the connecting piece 50 and the lower insulating member 20 can form a support. It is understood that, in this solution, the arrangement of the welding area 501 and the connecting structure 51 is similar to... Figure 3 The examples shown are similar, so they will not be repeated here.

[0124] In one embodiment, please continue to refer to Figure 7 The support member 60 also includes an auxiliary support member 62, with at least one auxiliary support member 62 corresponding to each welding area 501. The auxiliary support member 62 is supported between the corresponding welding area 501 and the connecting structure 51. At this time, the auxiliary support member 62 can provide auxiliary support for the side of the connecting piece 50 near the pole post 30, and work together with the main support member 61 and the pole post 30 to further reduce the deformation of the connecting piece 50.

[0125] It is understood that the auxiliary support 62 can be similar to the main support 61 and is provided on the lower insulation member 20. In addition, a part of the structure of the auxiliary support 62 is located in the opposite area of ​​the lower insulation member 20 and the connecting piece 50, and another part of the structure extends beyond the opposite area of ​​the lower insulation member 20 and the connecting piece 50. In this way, the strength of the lower insulation member 20 can be strengthened, and the electrolyte can be guided during liquid injection and the gas can be guided during thermal runaway.

[0126] Furthermore, the auxiliary support 62 and the main support 61 corresponding to the same welding area 501 are located on both sides of the welding area 501 along the second direction S. Both the auxiliary support 62 and the main support 61 are constructed as strips extending along the first direction F. This arrangement forms a channel between the auxiliary support 62 and the main support 61, which can guide the electrolyte during liquid injection and guide the gas during thermal runaway when the electrode post 30 is installed. At the same time, the connecting piece 50 of the support 60 can be an anode electrode post. Thus, setting the support 60 at the position of the corresponding anode electrode post 30 of the lower insulating member 20 can play a foolproof role during the installation of the electrode post 30.

[0127] Figure 10 This is a schematic diagram of the battery structure provided in an embodiment of this application. Please refer to... Figure 10 On the other hand, this application also discloses a battery 200, which includes a housing 202, an electrode assembly 201, and a top cover assembly 100 as described in any of the above, and has all of its beneficial effects, which will not be repeated here. The top cover assembly 100 is disposed on one end of the housing 202, and the housing 202 and the top cover assembly 100 together form a receiving cavity, in which the electrode assembly 201 is located.

[0128] Furthermore, this application also discloses a battery pack, which includes the battery 200 as described above and has all of its beneficial effects, which will not be elaborated here.

[0129] 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.

[0130] 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.

[0131] 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. A top cover assembly, characterized in that, include: Top cover (10); Lower insulating member (20), the lower insulating member (20) is disposed on the surface of the top cover (10); A pole post (30) is inserted through the top cover (10) and the lower insulating member (20); and, A connecting piece (50) is located on the side of the lower insulating member (20) away from the top cover (10). The connecting piece (50) is connected to the pole post (30), and the connecting piece (50) is also provided with a plurality of welding areas (501). The welding areas (501) are configured to be welded to the tabs (2011) of the electrode assembly (201). Multiple support members (60) are provided for supporting the connecting piece (50). The projection of the support member (60) on the lower insulating member (20) is located outside the projection range of the welding area (501) on the lower insulating member (20). The multiple welding areas (501) and the lower insulating member (20) have gaps along the thickness direction (T) of the top cover assembly.

2. The top cover assembly according to claim 1, characterized in that, The support member (60) and the pole post (30) together support the connecting piece (50) so that the welding area (501) is suspended and supported on the lower insulating member (20) along the thickness direction (T) of the top cover assembly.

3. The top cover assembly according to claim 2, characterized in that, The support member (60) is connected to one of the lower insulating member (20) and the connecting piece (50), and presses against the other of the lower insulating member (20) and the connecting piece (50).

4. The top cover assembly according to claim 2, characterized in that, The connecting piece (50) includes a connecting structure (51), which is connected to the pole (30); The support member (60) includes a main support member (61), and one welding area (501) corresponds to at least one main support member (61). The main support (61) is supported on the side of the corresponding welding area (501) away from the connecting structure (51).

5. The top cover assembly according to claim 4, characterized in that, The number of welding areas (501) is two, and the connecting structure (51) is located between the two welding areas (501); The main support member (61) corresponding to the two welding areas (501) is located on opposite sides of the two welding areas (501).

6. The top cover assembly according to claim 4, characterized in that, The connecting piece (50) has a connecting hole (502), and the pole post (30) is fixedly connected to the connecting hole (502), the connecting hole (502) forming the connecting structure (51); or, The pole post (30) is fixedly connected to the side surface of the connecting piece (50) facing the top cover (10), and the part of the connecting piece (50) that is welded to the pole post (30) forms the connecting structure (51).

7. The top cover assembly according to any one of claims 4-6, characterized in that, One end of the main support member (61) is connected to the connecting piece (50), and the other end is pressed against and supported by the lower insulating member (20). When the connecting piece (50) and the main support member (61) are projected along the thickness direction (T) of the top cover assembly, the projection of the main support member (61) is outside the projection range of the connecting piece (50).

8. The top cover assembly according to claim 7, characterized in that, One end of the main support member (61) along the thickness direction (T) of the top cover assembly is integrally connected to the connecting piece (50), and the other end is pressed against the lower insulating member (20).

9. The top cover assembly according to claim 8, characterized in that, The main support member (61) includes a straight portion (611) and a bent portion (612) connected to each other. The straight portion (611) is parallel to the connecting piece (50), and the bent portion (612) bends relative to the connecting piece (50) toward the top cover (10). The straight portion (611) presses against the lower insulating member (20); The bent portion (612) is integrally connected to the connecting piece (50) along the height direction of the top cover assembly (100) away from the edge of the straight portion (611).

10. The top cover assembly according to claim 8, characterized in that, A first direction (F) and a second direction (S) are defined in the top cover assembly (100), the first direction and the second direction (S) being perpendicular to the thickness direction (T) of the top cover assembly. The main support member (61) extends continuously along the first direction (F); or, The main support member (61) has multiple hollowed-out notches (610) to divide the main support member (61) into multiple sub-support parts, and the multiple sub-support parts are arranged at intervals along the first direction (F).

11. The top cover assembly according to claim 7, characterized in that, The surface of the main support member (61) that presses against the lower insulating member (20) is provided with a plurality of recessed structures; and / or, The surface of the main support member (61) that presses against the lower insulating member (20) is provided with a heat-insulating coating; and / or, A heat-insulating pad is provided between the surface of the main support member (61) that presses against the lower insulation member (20) and the lower insulation member (20).

12. The top cover assembly according to any one of claims 4-6, characterized in that, The main support member (61) is disposed on the lower insulating member (20); One part of the main support member (61) is supported between the opposing surfaces of the lower insulator (20) and the connecting piece (50), while another part extends beyond the opposing areas of the lower insulator (20) and the connecting piece (50).

13. The top cover assembly according to claim 12, characterized in that, A first direction (F) and a second direction (S) are defined in the top cover assembly (100), the first direction (F) and the second direction (S) being perpendicular to the thickness direction (T) of the top cover assembly. The main support member (61) is constructed as a strip extending along the first direction (F).

14. The top cover assembly according to claim 13, characterized in that, The number of main support members (61) is multiple, and the multiple support members (60) are arranged at intervals along the second direction (S).

15. The top cover assembly according to any one of claims 4-6, characterized in that, The main support member (61) is constructed as a strip-shaped closed ring, and the main support member (61) is sleeved on the end of the welding area (501) of the connecting piece (50) that is away from the connecting structure (51).

16. The top cover assembly according to any one of claims 4-6, characterized in that, The support (60) also includes an auxiliary support (62), and one of the welding areas (501) corresponds to at least one of the auxiliary supports (62). The auxiliary support (62) is supported between the corresponding welding area (501) and the connection structure (51).

17. The top cover assembly according to claim 16, characterized in that, The auxiliary support (62) is provided on the lower insulating member (20); One part of the auxiliary support member (62) is located in the opposite area of ​​the lower insulator (20) and the connecting piece (50), and the other part extends out of the opposite area of ​​the lower insulator (20) and the connecting piece (50).

18. The top cover assembly according to claim 16, characterized in that, A first direction (F) and a second direction (S) are defined in the top cover assembly (100), the first direction and the second direction (S) being perpendicular to the thickness direction (T) of the top cover assembly. The auxiliary support (62) and the main support (61) corresponding to the same welding area (501) are respectively located on both sides of the welding area (501) along the second direction (S); Both the auxiliary support (62) and the main support (61) are constructed as strips extending along the first direction (F).

19. A battery, characterized in that, It includes a housing (202), an electrode assembly (201), and a top cover assembly (100) as claimed in any one of claims 1-18. The housing (202) and the top cover assembly (100) together enclose a receiving cavity, and the electrode assembly (201) is housed in the receiving cavity.

20. A battery pack, characterized in that, Includes at least one battery as described in claim 19.

21. An energy storage device, characterized in that, Includes the battery pack as described in claim 20.

22. An energy storage system, characterized in that, Includes the energy storage device as described in claim 21.

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