Battery and method of assembling the same, energy storage device

Abstract

The application provides a battery and an assembling method thereof and an energy storage device. The battery comprises an electrode assembly and a first end cover assembly. The electrode assembly comprises first and second pole cores, first and second tabs, the first tab being electrically connected to the first pole core, the second tab being electrically connected to the second pole core, and the first and second tabs being oppositely and spacedly arranged. The first end cover assembly comprises a first end cover, a first pole post and a first connecting sheet. The first pole post is mounted on the first end cover. The first connecting sheet comprises a first pole post connecting portion and first and second tab connecting portions. The first pole post connecting portion is electrically connected to the first pole post. The first and second tab connecting portions are respectively connected to two sides of the first pole post connecting portion and extend away from the first end cover. The first tab connecting portion is electrically connected to the first tab. The second tab connecting portion is electrically connected to the second tab. The technical scheme of the application can avoid the connection distance between the outer tab and the connecting sheet being too long and reduce the length of the tab.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a battery and its assembly method, and an energy storage device. Background Technology

[0002] With the development of green energy and the increasing environmental awareness of people, the application of recyclable batteries is becoming more and more widespread. A battery includes electrode assemblies, a casing, and end cap assemblies. The electrode assembly is located within the housing space formed by the casing and end cap assemblies and includes a core and tabs. The end cap assembly includes an end cap, terminals, and connecting tabs. The terminals are mounted on the end cap, and the connecting tabs connect the terminals and tabs, conducting electricity between them to form a current path of "terminal-connecting tab-tab-core".

[0003] When there are a large number of electrode cores (such as bipolar cores or multipolar cores), the electrode cores are usually thicker and the number of tabs is also greater. However, the current structural design of the connecting piece results in an excessively long connection distance between the outer tab and the connecting piece when the electrode cores are thicker and the number of tabs is greater, leading to redundancy in the tab length. Summary of the Invention

[0004] The embodiments of this application provide a battery and its assembly method, and an energy storage device, which can avoid excessively long connection distance between the outer tab and the connecting piece, and reduce the length of the tab.

[0005] In a first aspect, this application provides a battery, the battery including an electrode assembly and a first end cap assembly;

[0006] The electrode assembly includes a first electrode core, a second electrode core, a first electrode tab, and a second electrode tab. The first electrode core and the second electrode core are stacked. The first electrode tab is electrically connected to the first electrode core, and the second electrode tab is electrically connected to the second electrode core. Along the arrangement direction of the first electrode core and the second electrode core, the first electrode tab and the second electrode tab are arranged opposite to each other and spaced apart.

[0007] The first end cap assembly includes a first end cap, a first terminal post, and a first connecting piece. The first terminal post is mounted on the first end cap. The first connecting piece includes a first terminal post connecting portion, a first tab connecting portion, and a second tab connecting portion. The first terminal post connecting portion is electrically connected to the first terminal post. Along the width direction of the battery, the first tab connecting portion and the second tab connecting portion are respectively connected to both sides of the first terminal post connecting portion and extend in a direction away from the first end cap. The surface of the first tab connecting portion away from the second tab connecting portion contacts and is electrically connected to the first tab. The surface of the second tab connecting portion away from the first tab connecting portion contacts and is electrically connected to the second tab.

[0008] It is understandable that in the first connecting piece, by extending both the first tab connecting portion and the second tab connecting portion in a direction away from the first end cap, both the first tab connecting portion and the second tab connecting portion can extend towards the electrode assembly. Compared to the planar connecting piece design, this folded, three-dimensional first connecting piece not only helps to shorten the connection distance between the first tab and the first tab connecting portion and the connection distance between the second tab and the second tab connecting portion, reducing the length of the first tab and the second tab, and simplifying the merging action of multi-core (multi-core can be directly merged), but also avoids the problems of increased current path, increased internal resistance, easy tearing, and high cost caused by bending the shell after the tabs are connected to the planar connecting piece in related technologies. Furthermore, while keeping the length of the first tab and the second tab the same as the length of the tabs in related technologies, the current flow area between each tab and the first connecting piece can be effectively increased.

[0009] In one possible implementation, the included angles between the first electrode tab connection portion and the second electrode tab connection portion and the first electrode post connection portion are both between 80° and 100°.

[0010] In one possible implementation, the first electrode tab connection portion is provided with a first solder mark, the first electrode tab connection portion is connected to the first electrode tab through the first solder mark, and the length of the first electrode tab connection portion is greater than the length of the first solder mark; and / or,

[0011] The second electrode tab connection portion is provided with a second solder mark, and the second electrode tab connection portion is connected to the second electrode tab through the second solder mark. The length of the second electrode tab connection portion is greater than the length of the second solder mark.

[0012] In one possible implementation, the first pole post connection portion is provided with a first through hole, the first through hole extends through the first pole post connection portion along the thickness direction, a portion of the first pole post is located inside the first through hole, and the outer side of the first pole post located inside the first through hole is welded to the inner wall of the first through hole by seam welding.

[0013] In one possible implementation, the surface of the first pole post facing away from the first end cap is flush with the surface of the first pole post connection portion facing away from the first end cap.

[0014] In one possible implementation, the first end cap assembly further includes a first lower plastic, which includes a lower plastic body and a support portion. The lower plastic body is stacked with the first end cap, and the support portion is connected around the outer edge of the lower plastic body and is used to abut against the electrode assembly. The support portion and the lower plastic body form a mounting groove, and a portion of the first electrode post, the first connecting piece, at least a portion of the first electrode tab, and at least a portion of the second electrode tab are located in the mounting groove.

[0015] In one possible implementation, in the thickness direction of the first lower plastic, the size of the support portion is larger than the size of the first tab connection portion, and the size of the support portion is also larger than the size of the second tab connection portion.

[0016] In one possible implementation, the support portion is provided with a first welding hole and a second welding hole. Both the first welding hole and the second welding hole penetrate the support portion along the width direction of the first lower plastic and are connected to the mounting groove. The orthographic projection of the first weld mark on the support portion is located in the area of ​​the first welding hole, and the orthographic projection of the second weld mark on the support portion is located in the area of ​​the second welding hole.

[0017] In one possible implementation, the first end cap assembly further includes a first insulating tape and a second insulating tape;

[0018] The first insulating tape is disposed on the support portion and covers the first welding hole, and / or the first insulating tape is disposed on the first electrode tab connection portion and covers the first solder mark;

[0019] The second insulating tape is disposed on the support portion and covers the second welding hole, and / or the second insulating tape is disposed on the second electrode tab connection portion and covers the second solder mark.

[0020] In one possible implementation, the electrode assembly further includes a third tab and a fourth tab. The third tab is electrically connected to the first electrode core, and the fourth tab is electrically connected to the second electrode core. The third tab and the first tab are respectively located at both ends of the first electrode core, and the fourth tab and the second tab are respectively located at both ends of the second electrode core. Along the arrangement direction of the first electrode core and the second electrode core, the third tab and the fourth tab are arranged opposite to each other and spaced apart.

[0021] The battery further includes a second end cap assembly, which includes a second end cap, a second terminal post, and a second connecting piece. The second terminal post is mounted on the second end cap. The second connecting piece includes a second terminal post connecting portion, a third tab connecting portion, and a fourth tab connecting portion. The second terminal post connecting portion is electrically connected to the second terminal post. Along the width direction of the battery, the third tab connecting portion and the fourth tab connecting portion are respectively connected to both sides of the second terminal post connecting portion and extend in a direction away from the second end cap. The surface of the third tab connecting portion away from the fourth tab connecting portion contacts and is electrically connected to the third tab. The surface of the fourth tab connecting portion away from the third tab connecting portion is electrically connected to the fourth tab.

[0022] In one possible implementation, the battery further includes a tab fastener, which is stacked with the second end cap. The tab fastener includes a first surface and a second surface, with the first surface facing the second end cap and the second surface facing the electrode assembly. The tab fastener is provided with a first receiving groove, a first lead-out hole, and a second lead-out hole.

[0023] The opening of the first receiving groove is located on the first surface, and the first receiving groove is recessed from the first surface toward the interior of the electrode restraint member, and the second connecting piece is located in the first receiving groove;

[0024] The openings at one end of the first lead-out hole and the second lead-out hole are both located on the second surface, and the openings at the other end of the first lead-out hole and the second lead-out hole are both connected to the first receiving groove. The first lead-out hole and the second lead-out hole are spaced apart along the width direction of the electrode tab restraint member. The third electrode tab passes through the first lead-out hole and is bent and connected to the third electrode tab connecting part. The fourth electrode tab passes through the second lead-out hole and is bent and connected to the fourth electrode tab connecting part.

[0025] In one possible implementation, the tab restraint member is further provided with a second receiving groove, the opening of the second receiving groove is located on the second surface, the second receiving groove is recessed from the second surface into the interior of the tab restraint member, and communicates with both the first lead-out hole and the second lead-out hole, and a portion of the third tab and a portion of the fourth tab are located in the second receiving groove.

[0026] Secondly, this application also provides a method for assembling a battery, the method comprising the following steps:

[0027] S1: Provides an electrode assembly and a first end cap assembly, wherein the electrode assembly includes a first electrode core, a second electrode core, a first electrode tab, and a second electrode tab, the first electrode core and the second electrode core are stacked, the first electrode tab is electrically connected to the first electrode core, the second electrode tab is electrically connected to the second electrode core, and the first electrode tab and the second electrode tab are arranged opposite to and spaced apart along the arrangement direction of the first electrode core and the second electrode core. The first end cap assembly includes a first end cap, a first lower plastic, a first electrode post, and a first connecting piece. The first lower plastic includes a lower plastic body and a support portion, the lower plastic body is stacked with the first end cap, the support portion is connected around the outer edge of the lower plastic body and is used to abut against the electrode assembly, the support portion and the lower plastic body surround to form The mounting groove is provided with a first welding hole and a second welding hole. Both the first welding hole and the second welding hole penetrate the support part along the width direction of the first lower plastic and are connected to the mounting groove. The first pole is mounted on the first end cap and the lower plastic body. A portion of the first pole, the first connecting piece, at least a portion of the first electrode tab, and at least a portion of the second electrode tab are located in the mounting groove. The first connecting piece includes a first pole connecting part, a first electrode tab connecting part, and a second electrode tab connecting part. The first pole connecting part is electrically connected to the first pole. Along the width direction of the first end cap assembly, the first electrode tab connecting part and the second electrode tab connecting part are respectively connected to both sides of the first pole connecting part and extend in a direction away from the first end cap.

[0028] S2: Connect the first end cap assembly to the electrode assembly, wherein the first electrode tab connection portion is laser welded to the first electrode tab through the first welding hole, and the second electrode tab connection portion is laser welded to the second electrode tab through the second welding hole.

[0029] In one possible implementation, the electrode assembly further includes a third tab and a fourth tab. The third tab is electrically connected to the first electrode core, and the fourth tab is electrically connected to the second electrode core. The third tab and the first tab are respectively located at both ends of the first electrode core, and the fourth tab and the second tab are respectively located at both ends of the second electrode core. Along the arrangement direction of the first electrode core and the second electrode core, the third tab and the fourth tab are arranged opposite to each other and spaced apart.

[0030] After step S2, the method further includes:

[0031] S3: Provide an electrode tab restraint member, wherein the electrode tab restraint member includes a first surface and a second surface, the first surface facing away from the electrode assembly, the second surface facing the electrode assembly, the electrode tab restraint member having a first receiving groove, a first lead-out hole and a second lead-out hole, the opening of the first receiving groove being located on the first surface, the first receiving groove being recessed from the first surface toward the interior of the electrode tab restraint member, the openings at one end of the first lead-out hole and the second lead-out hole being located on the second surface, the openings at the other end of the first lead-out hole and the second lead-out hole being connected to the first receiving groove, and the first lead-out hole and the second lead-out hole being spaced apart along the width direction of the electrode tab restraint member;

[0032] S4: Connect the tab fastener to the end of the electrode assembly away from the first end cap assembly, wherein the third tab passes through the first lead-out hole and the first receiving groove, and the fourth tab passes through the second lead-out hole and the first receiving groove.

[0033] In one possible implementation, the electrode assembly includes a first side, a second side, a third side, and a fourth side. The first side and the second side are arranged opposite to each other and spaced apart along the length direction of the first end cap assembly. The third side and the fourth side are both connected between the first side and the second side and are arranged opposite to each other and spaced apart along the width direction of the first end cap assembly. The area of ​​the first side and the second side is smaller than the area of ​​the third side and the fourth side.

[0034] After step S4, the method further includes:

[0035] S5: Provides a first air guide plate, a second air guide plate, a first Mylar membrane, and a second Mylar membrane;

[0036] S6: Connect the first air guide plate, the second air guide plate, the first Mylar membrane, and the second Mylar membrane to the first end cap assembly and the tab restraint member, wherein the first air guide plate covers the first side, the second air guide plate covers the second side, the first Mylar membrane covers the third side, a portion of the first air guide plate, and a portion of the second air guide plate, the second Mylar membrane covers the fourth side, a portion of the first air guide plate, and a portion of the second air guide plate, and both ends of the first air guide plate, the second air guide plate, the first Mylar membrane, and the second Mylar membrane are respectively connected to the first lower plastic and the tab restraint member.

[0037] In one possible implementation, after step S6, the method further includes:

[0038] S7: Provides a housing;

[0039] S8: The housing is fitted onto the outside of the electrode assembly and connected to the first end cap.

[0040] In one possible implementation, after step S8, the method further includes:

[0041] S9: Provide a second end cap assembly, wherein the second end cap assembly includes a second end cap, a second pole post, and a second connecting piece, the second pole post is mounted on the second end cap, the second connecting piece includes a second pole post connecting portion, a third pole tab connecting portion, and a fourth pole tab connecting portion, the second pole post connecting portion is electrically connected to the second pole post, and along the width direction of the second end cap assembly, the third pole tab connecting portion and the fourth pole tab connecting portion are respectively connected to both sides of the second pole post connecting portion, and both extend in a direction away from the second end cap;

[0042] S10: Electrically connect the third electrode connector to the third electrode through the first lead-out hole, and electrically connect the fourth electrode connector to the fourth electrode through the second lead-out hole.

[0043] In one possible implementation, after step S10, the method further includes:

[0044] S11: Connect the second end cap to the end of the housing away from the first end cap, wherein the third electrode tab is folded and bent and connected to the third electrode tab connecting part, and the fourth electrode tab is folded and bent and connected to the fourth electrode tab connecting part;

[0045] S12: Provides a first top patch, a second top patch, and a protective film;

[0046] S13: The first top patch is attached to the first end cap, the second top patch is attached to the second end cap, and the protective film is wrapped around the outside of the housing, wherein the protective film also covers part of the first top patch and the second top patch.

[0047] Thirdly, this application also provides an energy storage device, which includes the battery described above.

[0048] The beneficial technical effects of this application are as follows: In the first connecting piece, by extending both the first tab connecting portion and the second tab connecting portion in a direction away from the first end cover, both the first tab connecting portion and the second tab connecting portion can extend towards the electrode assembly. Compared with the planar connecting piece design, this folded three-dimensional first connecting piece not only helps to shorten the connection distance between the first tab and the first tab connecting portion and the connection distance between the second tab and the second tab connecting portion, reducing the length of the first tab and the second tab, and simplifying the merging action of multi-core (multi-core can be directly merged), but also avoids the problems of increased current path, increased internal resistance, easy tearing, and high cost caused by bending the shell after the tabs are connected to the planar connecting piece in related technologies. Furthermore, while keeping the length of the first tab and the second tab the same as the length of the tabs in related technologies, the current flow area between each tab and the first connecting piece can be effectively increased. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the energy storage system provided in an embodiment of this application;

[0050] Figure 2 This is a schematic diagram of the battery structure provided in an embodiment of this application;

[0051] Figure 3 yes Figure 2 The diagram shows the exploded structure of the battery.

[0052] Figure 4 yes Figure 3 A schematic diagram of the electrode assembly of the battery shown.

[0053] Figure 5 yes Figure 4 The diagram shows the exploded structure of the electrode assembly.

[0054] Figure 6 yes Figure 2 A schematic diagram of the structure of the first end cap assembly of the battery shown;

[0055] Figure 7 yes Figure 6 An exploded view of the first end cap assembly shown.

[0056] Figure 8 It is along Figure 2 A schematic diagram of the cross-sectional structure of the first end cap assembly obtained by cutting along section line AA.

[0057] Figure 9 yes Figure 6 A schematic diagram of the structure of the first lower plastic part of the first end cap assembly at an angle;

[0058] Figure 10 yes Figure 6A schematic diagram of the structure of the first lower plastic part of the first end cap assembly from another angle;

[0059] Figure 11 yes Figure 6 A schematic diagram of the structure of the first connecting piece of the first end cap assembly at one angle;

[0060] Figure 12 yes Figure 6 A schematic diagram of the structure of the first connecting piece of the first end cap assembly from another angle;

[0061] Figure 13 yes Figure 2 The diagram shows the structure of the second end cap assembly of the battery.

[0062] Figure 14 yes Figure 13 An exploded view of the second end cap assembly shown.

[0063] Figure 15 It is along Figure 2 A schematic diagram of the cross-sectional structure of the second end cap assembly obtained by cutting along section line BB;

[0064] Figure 16 This is a schematic flowchart illustrating a battery assembly method provided in an embodiment of this application;

[0065] Figure 17 This is a schematic diagram of the battery assembly method provided in the embodiments of this application.

[0066] Figure label:

[0067] Energy storage system 400, high-voltage cable 410, first power conversion device 420, second power conversion device 430, energy storage device 300, battery 200, casing 210, first end cap assembly 100, second end cap assembly 220, electrode assembly 230, first air guide plate 240, second air guide plate 250, first Mylar membrane 260, second Mylar membrane 270, first top patch 280, second top patch 290, protective film 291, first side 2301, second side 2302, third side 2303, fourth side 2304, first electrode core 2310, second electrode core 2320, first electrode tab 2330, second electrode tab 2340, third electrode tab 2350, fourth electrode tab 2360, first end cap 10, first upper plastic 20, first lower plastic 30, first electrode post 40, first sealing ring 50, first pressure block 60, first explosion-proof Valve assembly 70, first connecting piece 80, lower plastic body 31, support part 32, mounting groove 33, first welding hole 321, second welding hole 322, first pole post connecting part 81, first through hole 811, first pole ear connecting part 82, second pole ear connecting part 83, first weld mark 821, second weld mark 831, second end cap 2210, second upper plastic 2220, second lower plastic 2230, second pole post 2240, second sealing ring 2250, second pressure block 2260, second explosion-proof valve assembly 2270, second connecting piece 2280, pole ear restraint 2290, second pole post connecting part 2281, third pole ear connecting part 2282, fourth pole ear connecting part 2283, first surface 2291, second surface 2292, first receiving groove 2293, first lead-out hole 2294, second lead-out hole 2295, second receiving groove 2296. Detailed Implementation

[0068] For ease of understanding, the terminology used in the embodiments of this application will be explained first.

[0069] And / or: This is simply a way of describing the relationship between related objects. It indicates that there can be three kinds of relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0070] Multiple: refers to two or more.

[0071] Connection: should be interpreted broadly. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through an intermediary.

[0072] The specific embodiments of this application will now be clearly described in conjunction with the accompanying drawings.

[0073] Embodiments of this application provide a battery, an assembly method thereof, and an energy storage device.

[0074] 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 for future applications. Currently, the main way to generate green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels.

[0075] 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.

[0076] Taking electrochemical energy storage as an example, this solution provides an energy storage device for use in energy storage systems. The energy storage device is equipped with a set of chemical batteries, which mainly use the chemical elements in the batteries as energy storage media. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage media. Simply put, the electrical energy generated by wind and solar energy is stored in the chemical batteries. 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.

[0077] 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:

[0078] (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.

[0079] (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 electricity load period, thereby achieving a balance between power production and consumption.

[0080] (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.

[0081] In some embodiments, please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the energy storage system 400 provided in an embodiment of this application. Figure 1 In this application, the embodiment is 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.

[0082] An embodiment of this application provides an energy storage system 400. The energy storage system 400 includes a high-voltage cable 410, a first power conversion device 420, a second power conversion device 430, and an energy storage device 300.

[0083] In some embodiments of the power generation scenario, the second power conversion device 430 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 via grid connection. The energy storage device 300 is connected to a high-voltage cable and outputs smooth electricity to the power consumption side of the distribution network, achieving peak shaving and frequency regulation, and ensuring stable grid operation. Alternatively, the wind power conversion device is always connected to the high-voltage cable. 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 via the high-voltage cable. When the current electricity load is low and the wind power conversion device generates excess electricity, the excess electricity is stored in the energy storage device 300, reducing wind and solar curtailment rates and improving the absorption of new energy power generation. Furthermore, when the power 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 410 in a grid-connected mode to supply the power to the power 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.

[0084] In some embodiments on the distribution network side, the first power conversion device 420 can be a photovoltaic power conversion device. The energy storage device 300 is connected to the high-voltage cable 410 and installed downstream of the high-voltage cable 410 between the high-voltage cable 410 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 a fault occurs in the power grid / distribution network. Alternatively, it can alleviate line congestion on the high-voltage cable 410 transmission line and provide power support during planned power grid expansion to delay the economic pressure caused by power grid / distribution capacity expansion.

[0085] Optionally, the first power conversion device 420 may include, but is not limited to, a wind power conversion device, and the second power conversion device 430 may include, but is not limited to, a photovoltaic power conversion device. The first power conversion device 420 and the second power conversion device 430 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy.

[0086] 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.

[0087] Optionally, the energy storage device 300 may include, but is not limited to, single-cell batteries, or battery modules, battery packs, battery clusters, power banks, energy storage cabinets / containers, and other battery integrated systems composed of single-cell 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. This application embodiment only uses a multi-cell battery as an example for illustration.

[0088] 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.

[0089] 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 the embodiments of this application do not specifically limit this.

[0090] Please refer to the following: Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery 200 provided in an embodiment of this application. Figure 3 yes Figure 2 The diagram shows an exploded view of the battery 200.

[0091] For ease of description, the length direction of battery 200 is defined as the X direction, the width direction as the Y direction, and the height direction as the Z direction. The X, Y, and Z directions are all perpendicular to each other.

[0092] In embodiments of this application, the battery 200 may include a housing 210, a first end cap assembly 100, a second end cap assembly 220, an electrode assembly 230, a first vent plate 240, a second vent plate 250, a first Mylar membrane 260, a second Mylar membrane 270, a first top patch 280, a second top patch 290, and a protective film 291. The first end cap assembly 100 and the second end cap assembly 220 are respectively connected to both ends of the housing 210 and together with the housing 210 form an accommodating space. The electrode assembly 230, the first vent plate 240, the second vent plate 250, the first Mylar membrane 260, and the second Mylar membrane 270 are all located within the accommodating space. Along the length direction of the electrode assembly 230 (X direction in the figure), the first vent plate 240 and the second vent plate 250 are respectively located on both sides of the electrode assembly 230, and both ends of the first vent plate 240 and the second vent plate 250 are respectively connected to the first end cap assembly 100 and the second end cap assembly 220. Along the width direction of the electrode assembly 230, a first Mylar membrane 260 and a second Mylar membrane 270 are located on both sides of the electrode assembly 230, and both ends of the first Mylar membrane 260 and the second Mylar membrane 270 are connected to the first end cap assembly 100 and the second end cap assembly 220, respectively. The first Mylar membrane 260 and the second Mylar membrane 270 also partially cover the first air guide plate 240 and the second air guide plate 250. A first top patch 280 is attached to the first end cap assembly 100, and a second top patch 290 is attached to the second end cap assembly 220. A protective film 291 covers the outside of the housing 210 and also partially covers the first top patch 280 and the second top patch 290.

[0093] It should be noted that, Figure 2 and Figure 3 The purpose is merely to schematically illustrate the connection relationships of the components in battery 200, and is not to specifically limit the connection positions, specific structures, or quantities of each component. Furthermore, the structures illustrated in the embodiments of this application do not constitute a specific limitation on battery 200. In other embodiments of this application, battery 200 may include components that are more... Figure 2 and Figure 3 This may involve more or fewer components, or combining certain components, or splitting certain components, or different component arrangements. Figure 2 and Figure 3 The components shown can be implemented in hardware, software, or a combination of both.

[0094] The relative positional relationships of the components in the battery 200 provided in this embodiment have been briefly described above. The following will describe in detail the structure of each component in the battery provided in this embodiment and the connection relationship between each component with reference to the accompanying drawings.

[0095] Please refer to the following: Figure 4 and Figure 5 , Figure 4 yes Figure 3 The diagram shows the structure of the electrode assembly 230 of the battery 200. Figure 5 yes Figure 4 The diagram shows an exploded view of the electrode assembly 230.

[0096] In embodiments of this application, the electrode assembly 230 may include a first side surface 2301, a second side surface 2302, a third side surface 2303, and a fourth side surface 2304. The first side surface 2301 and the second side surface 2302 are positioned opposite each other and spaced apart along the length direction (X direction in the figure) of the first end cap assembly 100. The third side surface 2303 and the fourth side surface 2304 are both connected between the first side surface 2301 and the second side surface 2302, and are positioned opposite each other and spaced apart along the width direction (Y direction in the figure) of the first end cap assembly 100. The areas of the first side surface 2301 and the second side surface 2302 may be equal, and the areas of the third side surface 2303 and the fourth side surface 2304 may be equal. The areas of the first side surface 2301 and the second side surface 2302 may both be smaller than the areas of the third side surface 2303 and the fourth side surface 2304. That is, in the electrode assembly 230, the third side surface 2303 and the fourth side surface 2304 are the two larger surfaces of the electrode assembly 230.

[0097] The electrode assembly 230 may include a first electrode core 2310, a second electrode core 2320, a first electrode tab 2330, and a second electrode tab 2340. The first electrode core 2310 and the second electrode core 2320 may be stacked. The first electrode core 2310 and the second electrode core 2320 may be formed by lamination or winding processes. The stacking direction of the first electrode core 2310 and the second electrode core 2320 may be the width direction (Y direction in the figure) of the first end cap assembly 100. The side surfaces of the first electrode core 2310 and the second electrode core 2320 may cooperate to form the first side surface 2301 and the second side surface 2302 described above. The surface of the first electrode core 2310 facing away from the second electrode core 2320 may form the third side surface 2303 described above. The surface of the second electrode core 2320 facing away from the first electrode core 2310 may form the fourth side surface 2304 described above.

[0098] The first electrode tab 2330 and the second electrode tab 2340 can be disposed on one side of the electrode assembly 230 and have the same polarity, such as both being positive electrodes or both being negative electrodes. The first electrode tab 2330 can be disposed on the first electrode core 2310 and electrically connected to the first electrode core 2310. The second electrode tab 2340 can be disposed on the second electrode core 2320 and electrically connected to the second electrode core 2320. Along the arrangement direction of the first electrode core 2310 and the second electrode core 2320 (Y direction in the figure), the first electrode tab 2330 and the second electrode tab 2340 can be arranged opposite to each other and spaced apart.

[0099] The electrode assembly 230 may have two first electrodes 2330. The two first electrodes 2330 have different polarities. The two first electrodes 2330 are spaced apart along the length of the electrode assembly 230 (X direction in the diagram). The electrode assembly 2340 may also have two second electrodes 2340. The two second electrodes 2340 have different polarities. The two second electrodes 2340 are spaced apart along the length of the electrode assembly 230.

[0100] The electrode assembly 230 may further include a third tab 2350 and a fourth tab 2360. The third tab 2350 and the fourth tab 2360 may be located on the other side of the electrode assembly 230 and have the same polarity, such as both being positive tabs or both being negative tabs. The third tab 2350 may be located on the first electrode core 2310 and electrically connected to it. The fourth tab 2360 may be located on the second electrode core 2320 and electrically connected to it. The third tab 2350 and the first tab 2330 may be located at opposite ends of the first electrode core 2310, and the fourth tab 2360 and the second tab 2340 may be located at opposite ends of the second electrode core 2320. Along the arrangement direction of the first electrode core 2310 and the second electrode core 2320 (Y direction in the diagram), the third tab 2350 and the fourth tab 2360 may be arranged opposite each other and spaced apart.

[0101] The electrode assembly 230 may have two third tabs 2350. The two third tabs 2350 have different polarities. The two third tabs 2350 are spaced apart along the length of the electrode assembly 230 (X direction in the diagram). The electrode assembly 230 may also have two fourth tabs 2360. The two fourth tabs 2360 have different polarities. The two fourth tabs 2360 are spaced apart along the length of the electrode assembly 230.

[0102] Please refer to the following: Figure 6 and Figure 7 , Figure 6 yes Figure 2 The diagram shows the structure of the first end cap assembly 100 of the battery 200. Figure 7 yes Figure 6 The exploded structural diagram of the first end cap assembly 100 shown.

[0103] In the embodiments of this application, the first end cap assembly 100 may include a first end cap 10, a first upper plastic 20, a first lower plastic 30, a first pole post 40, a first sealing ring 50, a first pressure block 60, a first explosion-proof valve assembly 70, and a first connecting piece 80.

[0104] The first upper plastic 20 can be installed on the first end cap 10 and located on one side of the thickness direction (Z direction in the figure) of the first end cap 10. There can be two first upper plastic 20s. The two first upper plastic 20s are installed at intervals on both sides of the length direction (X direction in the figure) of the first end cap 10.

[0105] The first lower plastic 30 can be stacked with the first end cap 10, and is located on both sides of the first end cap 10, respectively, along with the first upper plastic 20. The first lower plastic 30 can be used to abut against the electrode assembly 230.

[0106] The first terminal post 40 can be installed on the first end cover 10, the first upper plastic 20, and the first lower plastic 30, and is insulated from the first end cover 10 by the first upper plastic 20, the first lower plastic 30, and the first sealing ring 50. The first terminal post 40 can also serve as an electrode lead-out of the battery 200 to realize electrical connection between the battery 200 and an external device. There can be two first terminal posts 40. The two first terminal posts 40 can be a negative terminal and a positive terminal, respectively. The two first terminal posts 40 can be spaced apart along the length direction (X direction in the figure) of the first end cover 10.

[0107] The first sealing ring 50 can be sleeved on the outside of the first electrode post 40, and located between the first lower plastic 30 and the first electrode post 40, and between the first upper plastic 20 and the first electrode post 40. The first sealing ring 50 can be used to seal the gap between the first end cap 10 and the first electrode post 40, preventing electrolyte from entering this area and reducing the insulation between the first end cap 10 and the first electrode post 40 and the safety of the electrode assembly 230. There can be two first sealing rings 50. One first sealing ring 50 is sleeved on the positive electrode post, and the other first sealing ring 50 is sleeved on the negative electrode post.

[0108] The first pressure block 60 can be installed on the first upper plastic 20 and sleeved on the outside of the first electrode post 40, and is electrically connected to the first electrode post 40. There can be two first pressure blocks 60. The two first pressure blocks 60 are respectively installed on the two first upper plastic 20s and are electrically connected to the two first electrode posts 40 respectively.

[0109] The first explosion-proof valve assembly 70 can be installed on the first end cap 10 and used for pressure relief protection of the battery 200.

[0110] The first connecting piece 80 can be located on the side of the first lower plastic 30 opposite to the first end cap 10, and is connected to the first electrode post 40, and also to the first tab 2330 and the second tab 2340 of the electrode assembly 230. The first connecting piece 80 can be electrically connected between the first electrode post 40 and the electrode assembly 230. There can be two first connecting pieces 80. The two first connecting pieces 80 can be spaced apart along the length direction (X direction in the figure) of the first lower plastic 30. The two first connecting pieces 80 can be a positive electrode connecting piece and a negative electrode connecting piece, respectively, and are connected to the positive electrode post and the negative electrode post, respectively.

[0111] Please refer to the following: Figure 8 , Figure 9and Figure 10 , Figure 8 It is along Figure 2 The diagram shows a cross-sectional view of the first end cap assembly 100 obtained by cutting along section line AA. Figure 9 yes Figure 6 The diagram shown is a structural schematic of the first lower plastic 30 of the first end cap assembly 100 at an angle. Figure 10 yes Figure 6 A structural schematic diagram of the first lower plastic 30 of the first end cap assembly 100 from another angle.

[0112] The first lower plastic 30 may include a lower plastic body 31 and a support portion 32. The lower plastic body 31 may be stacked with the first end cap 10. The support portion 32 may be connected around the outer edge of the lower plastic body 31 and is used to abut against the electrode assembly 230. The support portion 32 and the lower plastic body 31 may form a mounting groove 33. A portion of the first electrode post 40, the first connecting piece 80, at least a portion of the first electrode tab 2330, and at least a portion of the second electrode tab 2340 may be located within the mounting groove 33.

[0113] Understandably, the first lower plastic 30 has good insulation properties. By forming a mounting groove 33 around the first lower plastic 30 and placing components such as the first electrode post 40, the first connecting piece 80, the first electrode tab 2330, and the second electrode tab 2340 within the mounting groove 33, the insulation distance between these components and other conductive components can be effectively increased, further improving the electrical insulation performance of the battery 200 and reducing the risk of short circuits. In addition, the mounting groove 33 can also provide a relatively safe protective space for these components, preventing them from being directly exposed to the outside and suffering from external impacts and compressions. It can also play a certain role in fixing and positioning these components, ensuring that they maintain a stable position within the battery 200, reducing displacement and shaking during vibration or impact, and ensuring the electrical connection and structural stability of the battery 200.

[0114] The support portion 32 may be provided with a first welding hole 321 and a second welding hole 322. Along the width direction of the first lower plastic 30 (Y direction in the figure), the first welding hole 321 and the second welding hole 322 may be arranged opposite to each other and spaced apart. Both the first welding hole 321 and the second welding hole 322 may penetrate the support portion 32 along the width direction of the first lower plastic 30 (Y direction in the figure) and communicate with the mounting groove 33. The first welding hole 321 may expose a portion of the first electrode tab 2330 and a portion of the first connecting piece 80, and the second welding hole 322 may expose a portion of the second electrode tab 2340 and a portion of the second connecting piece 2280.

[0115] The number of first welding holes 321 and second welding holes 322 can both be two. Along the width direction of the first lower plastic 30 (Y direction in the figure), the two first welding holes 321 can be provided on one side of the first lower plastic 30, and the two second welding holes 322 can be provided on the other side of the first lower plastic 30. Along the length direction of the first lower plastic 30 (X direction in the figure), the two first welding holes 321 can be spaced apart, and the two second welding holes 322 can be spaced apart.

[0116] Please refer to the following: Figure 8 , Figure 11 and Figure 12 , Figure 11 yes Figure 6 The diagram shows a structural schematic of the first connecting piece 80 of the first end cap assembly 100 at an angle. Figure 12 yes Figure 6 A structural schematic diagram of the first connecting piece 80 of the first end cap assembly 100 from another angle.

[0117] The first connecting piece 80 may include a first pole post connecting part 81, a first pole tab connecting part 82, and a second pole tab connecting part 83.

[0118] The first pole post connector 81 can be located on the side of the support portion 32 of the first lower plastic 30 away from the first end cap 10, and is stacked with the support portion 32 of the first lower plastic 30. The first pole post connector 81 can be electrically connected to the first pole post 40. The first pole post connector 81 can be provided with a first through hole 811. The first through hole 811 can penetrate the first pole post connector 81 along the thickness direction (Z direction in the figure). Part of the first pole post 40 is located inside the first through hole 811. The outer side of the first pole post 40 located inside the first through hole 811 is welded to the inner wall of the first through hole 811 by seam welding.

[0119] Understandably, using a seam welding process to weld the first electrode connection 81 and the first electrode 40 together can form a high-strength mechanical connection and a low-resistance electrical connection. The continuous weld seam formed by this welding method not only provides a good conductive path, reducing contact resistance and energy loss, but also effectively resists the effects of mechanical vibration and impact, preventing loosening between the first electrode 40 and the first connecting piece 80, avoiding electrical faults caused by poor contact, and ensuring the stability of the battery 200 during long-term use. Furthermore, the fit between the first through hole 811 and the first electrode 40 facilitates welding positioning between the first connecting piece 80 and the first electrode 40, which helps to accelerate assembly efficiency.

[0120] Furthermore, the surface of the first terminal 40 facing away from the first end cap 10 and the surface of the first terminal connection portion 81 facing away from the first end cap 10 can be flush. With this arrangement, the first terminal 40 and the first terminal connection portion 81 can be arranged coplanarly, reducing bends and transitions in the current transmission path, thereby reducing voltage drop and making the current transmission between the first terminal 40 and the first connecting piece 80 more stable and efficient.

[0121] In the embodiments of this application, along the width direction of the first lower plastic 30 (Y direction in the figure), the first electrode tab connection portion 82 and the second electrode tab connection portion 83 can be respectively connected to both sides of the first electrode post connection portion 81, and both extend in a direction away from the first end cap 10. The surface of the first electrode tab connection portion 82 facing away from the second electrode tab connection portion 83 contacts and is electrically connected to the first electrode tab 2330, and the surface of the second electrode tab connection portion 83 facing away from the first electrode tab connection portion 82 contacts and is electrically connected to the second electrode tab 2340.

[0122] Optionally, the included angles between the first tab connecting portion 82 and the second tab connecting portion 83 and the first pole post connecting portion 81 are both between 80° and 100° (including the endpoint values ​​of 80° and 100°). For example, the first tab connecting portion 82 and the second tab connecting portion 83 are both perpendicular to the first pole post connecting portion 81. The perpendicularity of the first tab connecting portion 82 and the second tab connecting portion 83 to the first pole post connecting portion 81 means that the included angle between the first tab connecting portion 82 and the first pole post connecting portion 81, and the included angle between the second tab connecting portion 83 and the first pole post connecting portion 81, are 90° or approximately 90°, such as 85°, 86°, 87°, 88°, 89°, 91°, 92°, 93°, 94°, 95°, etc.

[0123] It is understandable that in the first connecting piece 80, by extending both the first tab connecting portion 82 and the second tab connecting portion 83 in a direction away from the first end cover 10, both the first tab connecting portion 82 and the second tab connecting portion 83 can extend towards the electrode assembly 230. Compared with the planar connecting piece design, this folded, three-dimensional first connecting piece 80 not only helps to shorten the connection distance between the first tab 2330 and the first tab connecting portion 82 and the second tab 2340 and the second tab connecting portion 83, reducing the length of the first tab 2330 and the second tab 2340, and simplifying the merging action of multi-core (multi-core can be directly merged), but also avoids the problems of increased current path, increased internal resistance, easy tearing, and high cost caused by bending the shell after the tabs are connected to the planar connecting piece in related technologies. Furthermore, while keeping the lengths of the first tab 2330 and the second tab 2340 the same as the tab lengths in related technologies, the current flow area between each tab and the first connecting piece 80 can be effectively increased.

[0124] In the embodiments of this application, the first electrode tab connecting portion 82 may be provided with a first solder mark 821, and the first electrode tab connecting portion 82 is connected to the first electrode tab 2330 through the first solder mark 821. The length of the first electrode tab connecting portion 82 may be greater than the length of the first solder mark 821. And / or, the second electrode tab connecting portion 83 may be provided with a second solder mark 831, and the second electrode tab connecting portion 83 is connected to the second electrode tab 2340 through the second solder mark 831. The length of the second electrode tab connecting portion 83 may be greater than the length of the second solder mark 831.

[0125] Understandably, by welding the first tab connection 82 to the first tab 2330, and / or welding the second tab connection 83 to the second tab 2340, a low-resistance electrical connection can be formed between the first tab 2330 and the first connecting piece 80, and / or between the second tab 2340 and the second connecting piece 2280. This ensures efficient and stable current transmission, reduces energy loss, and improves the overall efficiency of the battery 200. Furthermore, the weld marks formed by welding can firmly fix each tab to the first connecting piece 80, preventing loosening and enhancing the stability and reliability of the connection.

[0126] Optionally, both the first solder mark 821 and the second solder mark 831 include ultrasonic soldering and laser soldering. Ultrasonic soldering is performed before each tab is assembled with the first connecting piece 80. Ultrasonic soldering can fuse multiple layers of tabs into a single unit, reducing or eliminating the formation of air bubbles between the tab layers. Laser soldering, performed on top of this, can significantly reduce the risk of delamination caused by welding each tab to the first connecting piece 80, thereby improving product yield.

[0127] Please refer to the following: Figure 8 and Figure 11 The orthographic projection of the first solder mark 821 on the support portion 32 of the first lower plastic 30 can be located within the area of ​​the first welding hole 321 of the first lower plastic 30. The orthographic projection of the second solder mark 831 on the support portion 32 of the first lower plastic 30 can be located within the area of ​​the second welding hole 322 of the first lower plastic 30.

[0128] In this way, the first electrode tab 2330 and the first electrode tab connecting part 82 can be easily welded together through the first welding hole 321, and the second electrode tab 2340 and the second electrode tab connecting part 83 can be easily welded together through the second welding hole 322.

[0129] Furthermore, in the thickness direction of the first lower plastic 30 (Z direction in the figure), the size H1 of the support portion 32 of the first lower plastic 30 can be larger than the size H2 of the first electrode connecting portion 82, and the size of the support portion 32 of the first lower plastic 30 can also be larger than the size H3 of the second electrode connecting portion 83.

[0130] With this configuration, the abutment relationship between the support portion 32 of the first lower plastic 30 and each electrode core of the electrode assembly 230 can maintain a certain distance between the first tab connection portion 82 and the second tab connection portion 83 of the first connecting piece 80 and each electrode core of the electrode assembly 230, thus preventing the first tab connection portion 82 and the second tab connection portion 83 of the first connecting piece 80 from being inserted backwards into each electrode core of the electrode assembly 230, which would cause a short circuit.

[0131] Optionally, the first end cap assembly 100 may further include a first insulating tape (not shown) and a second insulating tape (not shown). The first insulating tape may be disposed on the support portion 32 of the first lower plastic 30 and cover the first welding hole 321 of the first lower plastic 30, and / or, the first insulating tape may be disposed on the first tab connection portion 82 and cover the first solder mark 821. When the first insulating tape is disposed on the support portion 32 of the first lower plastic 30, the first insulating tape may be located on the side of the support portion 32 of the first lower plastic 30 facing the mounting groove 33 or on the side away from the mounting groove 33.

[0132] The second insulating tape may be disposed on the support portion 32 of the first lower plastic 30 and cover the second welding hole 322 of the first lower plastic 30, and / or, the second insulating tape may be disposed on the second electrode connecting portion 83 and cover the second solder mark 831. When the first insulating tape is disposed on the support portion 32 of the first lower plastic 30, it may be located on the inner or outer side of the support portion 32 of the first lower plastic 30. When the second insulating tape is disposed on the support portion 32 of the first lower plastic 30, the second insulating tape may be located on the side of the support portion 32 of the first lower plastic 30 facing the mounting groove 33 or on the side away from the mounting groove 33.

[0133] It is understandable that by adding a first insulating tape and a second insulating tape and attaching the first insulating tape and the second insulating tape to the above-mentioned positions, the welding area between the first electrode tab 2330 and the first electrode tab connection portion 82, as well as the welding area between the second electrode tab 2340 and the second electrode tab connection portion 83, can be effectively isolated, thereby enhancing the insulation effect of the aforementioned welding positions, preventing accidental contact between the aforementioned welding positions and other conductive components, and avoiding the occurrence of short circuits.

[0134] Please refer to the following: Figure 13 and Figure 14 , Figure 13 yes Figure 2 The diagram shows the structure of the second end cap assembly 220 of the battery 200. Figure 14 yes Figure 13 The exploded view of the second end cap assembly 220 is shown.

[0135] In embodiments of this application, the second end cap assembly 220 may include a second end cap 2210, a second upper plastic 2220, a second lower plastic 2230, a second pole post 2240, a second sealing ring 2250, a second pressure block 2260, a second explosion-proof valve assembly 2270, and a second connecting piece 2280.

[0136] The second upper plastic 2220 can be installed on the second end cap 2210 and located on one side of the second end cap 2210 in the thickness direction (Z direction in the figure). There can be two second upper plastic 2220s. The two second upper plastic 2220s are installed at intervals on both sides of the second end cap 2210 in the length direction (X direction in the figure).

[0137] The second lower plastic 2230 can be stacked with the second end cap 2210 and located on both sides of the second end cap 2210, respectively, along with the second upper plastic 2220.

[0138] The second terminal 2240 can be installed on the second end cap 2210, the second upper plastic 2220, and the second lower plastic 2230, and is insulated from the second end cap 2210 by the second upper plastic 2220, the second lower plastic 2230, and the second sealing ring 2250. The second terminal 2240 can also serve as an electrode lead-out of the battery 200 to achieve electrical connection between the battery 200 and an external device. There can be two second terminal 2240s. The two second terminal 2240s can be the negative terminal and the positive terminal, respectively. The two second terminal 2240s can be spaced apart along the length direction (X direction in the diagram) of the second end cap 2210.

[0139] The second sealing ring 2250 can be sleeved on the outside of the second electrode post 2240, and located between the second lower plastic 2230 and the second electrode post 2240, and between the second upper plastic 2220 and the second electrode post 2240. The second sealing ring 2250 can be used to seal the gap between the second end cap 2210 and the second electrode post 2240, preventing electrolyte from entering this area and reducing the insulation between the second end cap 2210 and the second electrode post 2240 and the safety of the electrode assembly 230. There can be two second sealing rings 2250. One second sealing ring 2250 is sleeved on the positive electrode post, and the other second sealing ring 2250 is sleeved on the negative electrode post.

[0140] The second pressure block 2260 can be installed on the second upper plastic 2220 and sleeved on the outside of the second pole post 2240, and electrically connected to the second pole post 2240. There can be two second pressure blocks 2260. The two second pressure blocks 2260 are respectively installed on the two second upper plastic 2220s and electrically connected to the two second pole posts 2240 respectively.

[0141] The second explosion-proof valve assembly 2270 can be installed on the second end cap 2210 and used for pressure relief protection of the battery 200.

[0142] The second connecting piece 2280 can be located on the side of the second lower plastic 2230 opposite to the second end cap 2210, and connected to the second electrode post 2240, and also connected to the second electrode tab 2340 of the electrode assembly 230. The second connecting piece 2280 can be electrically connected between the second electrode post 2240 and the electrode assembly 230. There can be two second connecting pieces 2280. The two second connecting pieces 2280 can be spaced apart along the length direction (X direction in the diagram) of the second lower plastic 2230. The two second connecting pieces 2280 can be a positive electrode connecting piece and a negative electrode connecting piece, respectively, and connected to the positive electrode post and the negative electrode post, respectively.

[0143] In embodiments of this application, the second connecting piece 2280 may include a second pole post connecting portion 2281, a third pole tab connecting portion 2282, and a fourth pole tab connecting portion 2283. The second pole post connecting portion 2281 can be electrically connected to the second pole post 2240. Along the width direction of the second lower plastic 2230 (Y direction in the figure), the third pole tab connecting portion 2282 and the fourth pole tab connecting portion 2283 are respectively connected to both sides of the second pole post connecting portion 2281 and both extend towards the second end cap 2210. The surface of the third pole tab connecting portion 2282 facing away from the fourth pole tab connecting portion 2283 contacts and is electrically connected to the third pole tab 2350, and the surface of the fourth pole tab connecting portion 2283 facing away from the third pole tab connecting portion 2282 contacts and is electrically connected to the fourth pole tab 2360. Optionally, the included angles between the third tab connection portion 2282 and the fourth tab connection portion 2283 and the second pole post connection portion 2281 are all between 80° and 100° (including the endpoint values ​​of 80° and 100°). For example, the third tab connection portion 2282 and the fourth tab connection portion 2283 are both perpendicular to the second pole post connection portion 2281.

[0144] The structures of the second pole post connecting part 2281, the third pole ear connecting part 2282, and the fourth pole ear connecting part 2283 are largely the same as those of the first pole post connecting part 81, the first pole ear connecting part 82, and the second pole ear connecting part 83 described above. Please refer to the above description, and it will not be repeated here.

[0145] Please refer to the following: Figure 13 , Figure 14 and Figure 15 , Figure 15 It is along Figure 2 The diagram shows a cross-sectional view of the second end cap assembly 220 obtained by cutting along section line BB.

[0146] In embodiments of this application, the battery 200 may further include a tab retainer 2290. The tab retainer 2290 may be located on the side of the second lower plastic 2230 opposite to the second end cap 2210 and abut against the second lower plastic 2230. The tab retainer 2290 may be used to abut against the electrode assembly 230 and fix the third tab 2350 and the fourth tab 2360 of the electrode assembly 230. A portion of the second terminal post 2240, the second connecting piece 2280, at least a portion of the third tab 2350, and at least a portion of the fourth tab 2360 are all located inside the tab retainer 2290.

[0147] The tab restraint member 2290 includes a first surface 2291 and a second surface 2292. The first surface 2291 faces the second end cap 2210, and the second surface 2292 faces the electrode assembly 230. The tab restraint member 2290 may be provided with a first receiving groove 2293, a first lead-out hole 2294, and a second lead-out hole 2295. The opening of the first receiving groove 2293 may be located on the first surface 2291. The first receiving groove 2293 is recessed from the first surface 2291 into the interior of the tab restraint member 2290. A portion of the second electrode post 2240, the second connecting piece 2280, at least a portion of the third tab 2350, and at least a portion of the fourth tab 2360 are all located within the first receiving groove 2293. The openings at one end of the first lead-out hole 2294 and the second lead-out hole 2295 are both located on the second surface 2292, and the openings at the other ends of the first lead-out hole 2294 and the second lead-out hole 2295 communicate with the first receiving groove 2293. Along the width direction (Y direction in the figure) of the tab restraint member 2290, the first lead-out hole 2294 and the second lead-out hole 2295 are provided at intervals. The third tab 2350 of the electrode assembly 230 can pass through the first lead-out hole 2294 and bend to connect with the third tab connecting part 2282, and the fourth tab 2360 of the electrode assembly 230 can pass through the second lead-out hole 2295 and bend to connect with the fourth tab connecting part 2283.

[0148] The number of first lead-out holes 2294 and the number of second lead-out holes 2295 can both be two. Along the length direction of the tab restraint member 2290 (X direction in the figure), the two first lead-out holes 2294 are arranged at intervals, and the two second lead-out holes 2295 are also arranged at intervals.

[0149] Understandably, by adding a tab restraint member 2290 between the second connecting piece 2280 and the electrode assembly 230, on the one hand, the tab restraint member 2290 can abut against each electrode core of the electrode assembly 230, thereby limiting the electrode cores of the electrode assembly 230; and on the other hand, the tab restraint member 2290 can allow each electrode tab of the electrode assembly 230 to pass through it, thereby fixing the electrode tabs of the electrode assembly 230. On the other hand, the tab restraint member 2290 can separate the second connecting piece 2280 and the electrode assembly 230 from each other, preventing short circuits caused by the second connecting piece 2280 being inserted backwards into the electrode assembly 230. In addition, during electrolyte filling of the battery 200, the presence of the tab restraint member 2290 can also provide a certain degree of buffering and support, effectively preventing the electrode assembly 230 from being impacted during electrolyte filling.

[0150] The tab restraint member 2290 may also be provided with a second receiving groove 2296. The opening of the second receiving groove 2296 may be located on the second surface 2292. The second receiving groove 2296 may be recessed from the second surface 2292 into the interior of the tab restraint member 2290 and communicate with both the first lead-out hole 2294 and the second lead-out hole 2295. Part of the third tab 2350 and part of the fourth tab 2360 are located within the second receiving groove 2296. With this arrangement, the tab restraint member 2290 can further limit the electrode assembly 230 and prevent the position of the electrode assembly 230 from changing.

[0151] Embodiments of this application may also provide a method for assembling the battery 200. For details regarding the structure of the battery 200, please refer to [link to relevant documentation]. Figures 2-15 As described above, it will not be repeated here. Furthermore, any additional descriptions of the structure of battery 200 below, unless otherwise specified, are applicable to the battery 200 described above.

[0152] Please refer to the following: Figure 8 , Figure 16 and Figure 17 , Figure 16 This is a schematic flowchart illustrating the assembly method of the battery 200 provided in an embodiment of this application. Figure 17 This is a schematic diagram of the assembly method of the battery 200 provided in the embodiments of this application.

[0153] The assembly method of battery 200 may include at least steps S1 and S2, which are described in detail below.

[0154] S1: Provides an electrode assembly 230 and a first end cap assembly 100. The electrode assembly 230 includes a first electrode core 2310, a second electrode core 2320, a first electrode tab 2330, and a second electrode tab 2340. The first electrode core 2310 and the second electrode core 2320 are stacked. The first electrode tab 2330 is electrically connected to the first electrode core 2310, and the second electrode tab 2340 is electrically connected to the second electrode core 2320. Along the arrangement direction of the first electrode core 2310 and the second electrode core 2320, the first electrode tab 2330 and the second electrode tab 2340 are arranged opposite to each other and spaced apart. The first end cap assembly 100 includes a first end cap 10, a first lower plastic 30, a first electrode post 40, and a first connecting piece 80. The first lower plastic 30 includes a lower plastic body 31 and a support portion 32. The lower plastic body 31 is stacked with the first end cap 10. The support portion 32 is connected around the outer edge of the lower plastic body 31 and is used to abut against the electrode assembly 230. The support portion 32 and the lower plastic body 31 surround to form an installation groove 33. The support portion 32 is provided with a first welding hole 321 and a second welding hole 322. The first welding hole 321 and the second welding hole 322 both penetrate the support portion 32 along the width direction of the first lower plastic 30 and are connected to the installation groove 33. The first pole post 40 is installed on the first end cover 10 and the lower plastic body 31. Part of the first pole post 40, the first connecting piece 80, at least part of the first pole ear 2330 and at least part of the second pole ear 2340 are located in the installation groove 33. The first connecting piece 80 includes a first pole post connecting part 81, a first pole ear connecting part 82 and a second pole ear connecting part 83. The first pole post connecting part 81 is electrically connected to the first pole post 40. Along the width direction of the first end cover assembly 100, the first pole ear connecting part 82 and the second pole ear connecting part 83 are respectively connected to both sides of the first pole post connecting part 81 and both extend in a direction away from the first end cover 10.

[0155] S2: Connect the first end cap assembly 100 to the electrode assembly 230, wherein the first electrode tab connection portion 82 is laser-welded to the first electrode tab 2330 through the first welding hole 321, and the second electrode tab connection portion 83 is laser-welded to the second electrode tab 2340 through the second welding hole 322. Specifically, the first electrode tab connection portion 82 and the first electrode tab 2330, and the second electrode tab connection portion 83 and the second electrode tab 2340 can be welded together by laser penetration welding.

[0156] Please refer to the following: Figure 3 , Figure 4 , Figure 8 , Figure 15 and Figure 17 After step S2, the assembly method of battery 200 may further include at least steps S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, and S13, which are described in detail below:

[0157] S3: Provide a tab restraint member 2290, wherein the tab restraint member 2290 includes a first surface 2291 and a second surface 2292. The first surface 2291 faces away from the electrode assembly 230, and the second surface 2292 faces the electrode assembly 230. The tab restraint member 2290 is provided with a first receiving groove 2293, a first lead-out hole 2294 and a second lead-out hole 2295. The opening of the first receiving groove 2293 is located on the first surface 2291. The first receiving groove 2293 is recessed from the first surface 2291 into the interior of the tab restraint member 2290. The openings at one end of the first lead-out hole 2294 and the second lead-out hole 2295 are both located on the second surface 2292. The openings at the other end of the first lead-out hole 2294 and the second lead-out hole 2295 are both connected to the first receiving groove 2293. The first lead-out hole 2294 and the second lead-out hole 2295 are spaced apart along the width direction of the tab restraint member 2290 (Y direction in the figure).

[0158] S4: Connect the tab restraint 2290 to the end of the electrode assembly 230 away from the first end cap assembly 100, wherein the third tab 2350 passes through the first lead-out hole 2294 and the first receiving groove 2293, and the fourth tab 2360 passes through the second lead-out hole 2295 and the first receiving groove 2293.

[0159] S5: Provides a first air guide plate 240, a second air guide plate 250, a first Mylar membrane 260, and a second Mylar membrane 270.

[0160] S6: Connect the first air guide plate 240, the second air guide plate 250, the first Mylar membrane 260, and the second Mylar membrane 270 to the first end cap assembly 100 and the electrode tab restraint member 2290, wherein, as Figure 4 and Figure 17 As shown, the first air guide plate 240 covers the first side 2301 of the electrode assembly 230, the second air guide plate 250 covers the second side 2302 of the electrode assembly 230, the first Mylar membrane 260 covers the third side 2303 of the electrode assembly 230, a portion of the first air guide plate 240 and a portion of the second air guide plate 250, and the second Mylar membrane 270 covers the fourth side 2304 of the electrode assembly 230, a portion of the first air guide plate 240 and a portion of the second air guide plate 250. Both ends of the first air guide plate 240, both ends of the second air guide plate 250, both ends of the first Mylar membrane 260 and both ends of the second Mylar membrane 270 are respectively connected to the first lower plastic 30 and the tab restraint member 2290. The first air guide plate 240, the second air guide plate 250, the first Mylar membrane 260 and the second Mylar membrane 270 can all be connected to the first lower plastic 30 and the tab restraint member 2290 by heat fusion.

[0161] S7: Provides housing 210.

[0162] S8: The housing 210 is fitted onto the outside of the electrode assembly 230 and connected to the first end cap 10. The housing 210 can be welded to the first end cap 10. The first air guide plate 240, the second air guide plate 250, the first Mylar membrane 260, and the second Mylar membrane 270 are all located between the housing 210 and the electrode assembly 230.

[0163] S9: Provide a second end cap assembly 220, wherein the second end cap assembly 220 includes a second end cap 2210, a second pole post 2240 and a second connecting piece 2280, the second pole post 2240 is mounted on the second end cap 2210, and the second connecting piece 2280 includes a second pole post connecting portion 2281, a third pole tab connecting portion 2282 and a fourth pole tab connecting portion 2283, the second pole post connecting portion 2281 is electrically connected to the second pole post 2240, and along the width direction of the second end cap assembly 220, the third pole tab connecting portion 2282 and the fourth pole tab connecting portion 2283 are respectively connected to both sides of the second pole post connecting portion 2281 and both extend in a direction away from the second end cap 2210.

[0164] S10: Electrically connect the third tab connection portion 2282 to the third tab 2350 passing through the first lead-out hole 2294, and electrically connect the fourth tab connection portion 2283 to the fourth tab 2360 passing through the second lead-out hole 2295. The third tab connection portion 2282 and the third tab 2350, as well as the fourth tab connection portion 2283 and the fourth tab 2360, can be connected together by laser welding.

[0165] S11: Connect the second end cap 2210 to the end of the housing 210 away from the first end cap 10, wherein the third tab 2350 is folded and bent to connect with the third tab connecting portion 2282, and the fourth tab 2360 is folded and bent to connect with the fourth tab connecting portion 2283. The housing 210 can be connected to the second end cap 2210 by welding.

[0166] S12: Provides a first top patch 280, a second top patch 290, and a protective film 291.

[0167] S13: The first top patch 280 is attached to the first end cap 10, the second top patch 290 is attached to the second end cap 2210, and the protective film 291 is wrapped around the outside of the housing 210, wherein the protective film 291 also covers part of the first top patch 280 and the second top patch 290.

[0168] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery, characterized in that, The battery includes an electrode assembly, a first end cap assembly, a second end cap assembly, and a tab restraint component; The electrode assembly includes a first electrode core, a second electrode core, a first electrode tab, a second electrode tab, a third electrode tab, and a fourth electrode tab. The first electrode core and the second electrode core are stacked. The first electrode tab and the third electrode tab are electrically connected to the first electrode core. The third electrode tab and the first electrode tab are respectively located at both ends of the first electrode core. The second electrode tab and the fourth electrode tab are electrically connected to the second electrode core. The fourth electrode tab and the second electrode tab are respectively located at both ends of the second electrode core. Along the arrangement direction of the first electrode core and the second electrode core, the first electrode tab and the second electrode tab are arranged opposite to each other and spaced apart. The third electrode tab and the fourth electrode tab are arranged opposite to each other and spaced apart. The first end cap assembly includes a first end cap, a first terminal post, and a first connecting piece. The first terminal post is mounted on the first end cap. The first connecting piece includes a first terminal post connecting portion, a first electrode tab connecting portion, and a second electrode tab connecting portion. The first terminal post connecting portion is electrically connected to the first terminal post. Along the width direction of the battery, the first electrode tab connecting portion and the second electrode tab connecting portion are respectively connected to both sides of the first terminal post connecting portion and extend in a direction away from the first end cap. The surface of the first electrode tab connecting portion away from the second electrode tab connecting portion contacts and is electrically connected to the first electrode tab. The surface of the second electrode tab connecting portion away from the first electrode tab connecting portion contacts and is electrically connected to the second electrode tab. The second end cap assembly includes a second end cap, a second terminal post, and a second connecting piece. The second terminal post is mounted on the second end cap. The second connecting piece includes a second terminal post connecting portion, a third electrode tab connecting portion, and a fourth electrode tab connecting portion. The second terminal post connecting portion is electrically connected to the second terminal post. Along the width direction of the battery, the third electrode tab connecting portion and the fourth electrode tab connecting portion are respectively connected to both sides of the second terminal post connecting portion and extend in a direction away from the second end cap. The surface of the third electrode tab connecting portion away from the fourth electrode tab connecting portion contacts and is electrically connected to the third electrode tab. The surface of the fourth electrode tab connecting portion away from the third electrode tab connecting portion is electrically connected to the fourth electrode tab. The electrode tab restraint is stacked with the second end cap. The electrode tab restraint includes a first surface and a second surface. The first surface faces the second end cap, and the second surface faces the electrode assembly. The electrode tab restraint is provided with a first receiving groove, a first lead-out hole, and a second lead-out hole. The opening of the first receiving groove is located on the first surface, and the first receiving groove is recessed from the first surface toward the interior of the electrode restraint member, and the second connecting piece is located in the first receiving groove; The openings at one end of the first lead-out hole and the second lead-out hole are both located on the second surface, and the openings at the other end of the first lead-out hole and the second lead-out hole are both connected to the first receiving groove. The first lead-out hole and the second lead-out hole are spaced apart along the width direction of the electrode tab restraint member. The third electrode tab passes through the first lead-out hole and is bent and connected to the third electrode tab connecting part. The fourth electrode tab passes through the second lead-out hole and is bent and connected to the fourth electrode tab connecting part.

2. The battery as described in claim 1, characterized in that, The included angles between the first electrode tab connection portion and the second electrode tab connection portion and the first electrode post connection portion are both between 80° and 100°.

3. The battery as described in claim 1, characterized in that, The first electrode tab connection portion is provided with a first solder mark, and the first electrode tab connection portion is connected to the first electrode tab through the first solder mark; the length of the first electrode tab connection portion is greater than the length of the first solder mark; and / or, The second electrode tab connection portion is provided with a second solder mark, and the second electrode tab connection portion is connected to the second electrode tab through the second solder mark. The length of the second electrode tab connection portion is greater than the length of the second solder mark.

4. The battery as described in claim 1, characterized in that, The first pole post connection part is provided with a first through hole. The first through hole extends through the first pole post connection part along the thickness direction. A portion of the first pole post is located inside the first through hole. The outer side of the first pole post located inside the first through hole is welded to the inner wall of the first through hole by a joint welding.

5. The battery as described in claim 4, characterized in that, The surface of the first pole post facing away from the first end cap is flush with the surface of the first pole post connection portion facing away from the first end cap.

6. The battery as described in claim 3, characterized in that, The first end cap assembly further includes a first lower plastic, which includes a lower plastic body and a support portion. The lower plastic body is stacked with the first end cap. The support portion is connected around the outer edge of the lower plastic body and is used to abut against the electrode assembly. The support portion and the lower plastic body form a mounting groove. A portion of the first electrode post, the first connecting piece, at least a portion of the first electrode tab, and at least a portion of the second electrode tab are located in the mounting groove.

7. The battery as described in claim 6, characterized in that, In the thickness direction of the first lower plastic, the size of the support portion is larger than the size of the first electrode tab connection portion, and the size of the support portion is also larger than the size of the second electrode tab connection portion.

8. The battery as described in claim 6, characterized in that, The support portion is provided with a first welding hole and a second welding hole. Both the first welding hole and the second welding hole penetrate the support portion along the width direction of the first lower plastic and are connected to the mounting groove. The orthographic projection of the first weld mark on the support portion is located in the area of ​​the first welding hole, and the orthographic projection of the second weld mark on the support portion is located in the area of ​​the second welding hole.

9. The battery as claimed in claim 8, characterized in that, The first end cap assembly also includes a first insulating tape and a second insulating tape; The first insulating tape is disposed on the support portion and covers the first welding hole, and / or the first insulating tape is disposed on the first electrode tab connection portion and covers the first solder mark; The second insulating tape is disposed on the support portion and covers the second welding hole, and / or the second insulating tape is disposed on the second electrode tab connection portion and covers the second solder mark.

10. The battery as claimed in claim 1, characterized in that, The tab restraint is further provided with a second receiving groove. The opening of the second receiving groove is located on the second surface. The second receiving groove is recessed from the second surface into the interior of the tab restraint and is connected to both the first lead-out hole and the second lead-out hole. Part of the third tab and part of the fourth tab are located in the second receiving groove.

11. A method for assembling a battery, characterized in that, The method includes the following steps: S1: Provides an electrode assembly and a first end cap assembly, wherein the electrode assembly includes a first electrode core, a second electrode core, a first electrode tab, a second electrode tab, a third electrode tab, and a fourth electrode tab. The first electrode core and the second electrode core are stacked. The first electrode tab and the third electrode tab are electrically connected to the first electrode core. The third electrode tab and the first electrode tab are respectively located at both ends of the first electrode core. The second electrode tab and the fourth electrode tab are electrically connected to the second electrode core. The fourth electrode tab and the second electrode tab are respectively located at both ends of the second electrode core. Along the arrangement direction of the first electrode core and the second electrode core, the first electrode tab and the second electrode tab are arranged opposite to each other and spaced apart. The third electrode tab and the fourth electrode tab are arranged opposite to each other and spaced apart. The first end cap assembly includes a first end cap, a first lower plastic, a first electrode post, and a first connecting piece. The first lower plastic includes a lower plastic body and a supporting part. The lower plastic body is stacked with the first end cap. A support portion is connected around the outer edge of the lower plastic body and is used to abut against the electrode assembly. The support portion and the lower plastic body form an installation groove. The support portion is provided with a first welding hole and a second welding hole. The first welding hole and the second welding hole both penetrate the support portion along the width direction of the first lower plastic body and are connected to the installation groove. The first electrode post is installed on the first end cap and the lower plastic body. A portion of the first electrode post, the first connecting piece, at least a portion of the first electrode tab, and at least a portion of the second electrode tab are located in the installation groove. The first connecting piece includes a first electrode post connecting portion, a first electrode tab connecting portion, and a second electrode tab connecting portion. The first electrode post connecting portion is electrically connected to the first electrode post. Along the width direction of the first end cap assembly, the first electrode tab connecting portion and the second electrode tab connecting portion are respectively connected to both sides of the first electrode post connecting portion and both extend in a direction away from the first end cap. S2: Connect the first end cap assembly to the electrode assembly, wherein the first electrode tab connection part is laser welded to the first electrode tab through the first welding hole, and the second electrode tab connection part is laser welded to the second electrode tab through the second welding hole; S3: Provide an electrode tab restraint member, wherein the electrode tab restraint member includes a first surface and a second surface, the first surface facing away from the electrode assembly, the second surface facing the electrode assembly, the electrode tab restraint member having a first receiving groove, a first lead-out hole and a second lead-out hole, the opening of the first receiving groove being located on the first surface, the first receiving groove being recessed from the first surface toward the interior of the electrode tab restraint member, the openings at one end of the first lead-out hole and the second lead-out hole being located on the second surface, the openings at the other end of the first lead-out hole and the second lead-out hole being connected to the first receiving groove, and the first lead-out hole and the second lead-out hole being spaced apart along the width direction of the electrode tab restraint member; S4: Connect the tab fastener to the end of the electrode assembly away from the first end cap assembly, wherein the third tab passes through the first lead-out hole and the first receiving groove, and the fourth tab passes through the second lead-out hole and the first receiving groove.

12. The method as described in claim 11, characterized in that, The electrode assembly includes a first side, a second side, a third side, and a fourth side. The first side and the second side are arranged opposite to each other and spaced apart along the length direction of the first end cap assembly. The third side and the fourth side are both connected between the first side and the second side and are arranged opposite to each other and spaced apart along the width direction of the first end cap assembly. The area of ​​the first side and the second side is smaller than the area of ​​the third side and the fourth side. After step S4, the method further includes: S5: Provides a first air guide plate, a second air guide plate, a first Mylar membrane, and a second Mylar membrane; S6: Connect the first air guide plate, the second air guide plate, the first Mylar membrane, and the second Mylar membrane to the first end cap assembly and the tab restraint member, wherein the first air guide plate covers the first side, the second air guide plate covers the second side, the first Mylar membrane covers the third side, a portion of the first air guide plate, and a portion of the second air guide plate, the second Mylar membrane covers the fourth side, a portion of the first air guide plate, and a portion of the second air guide plate, and both ends of the first air guide plate, the second air guide plate, the first Mylar membrane, and the second Mylar membrane are respectively connected to the first lower plastic and the tab restraint member.

13. The method as described in claim 12, characterized in that, After step S6, the method further includes: S7: Provides a housing; S8: The housing is fitted onto the outside of the electrode assembly and connected to the first end cap.

14. The method as described in claim 13, characterized in that, After step S8, the method further includes: S9: Provide a second end cap assembly, wherein the second end cap assembly includes a second end cap, a second pole post, and a second connecting piece, the second pole post is mounted on the second end cap, the second connecting piece includes a second pole post connecting portion, a third pole tab connecting portion, and a fourth pole tab connecting portion, the second pole post connecting portion is electrically connected to the second pole post, and along the width direction of the second end cap assembly, the third pole tab connecting portion and the fourth pole tab connecting portion are respectively connected to both sides of the second pole post connecting portion, and both extend in a direction away from the second end cap; S10: Electrically connect the third electrode connector to the third electrode through the first lead-out hole, and electrically connect the fourth electrode connector to the fourth electrode through the second lead-out hole.

15. The method as described in claim 14, characterized in that, After step S10, the method further includes: S11: Connect the second end cap to the end of the housing away from the first end cap, wherein the third electrode tab is folded and bent and connected to the third electrode tab connecting part, and the fourth electrode tab is folded and bent and connected to the fourth electrode tab connecting part; S12: Provides a first top patch, a second top patch, and a protective film; S13: The first top patch is attached to the first end cap, the second top patch is attached to the second end cap, and the protective film is wrapped around the outside of the housing, wherein the protective film also covers part of the first top patch and the second top patch.

16. An energy storage device, characterized in that, The energy storage device includes a battery as described in any one of claims 1-10.

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