Single battery, energy storage device, energy storage system and power supply system

Abstract

This application provides a single-cell battery, an energy storage device, an energy storage system, and a power supply system. The single-cell battery includes a casing with a receiving cavity; a cell disposed within the receiving cavity, including an electrically connected cell body and multiple tabs, the multiple tabs being disposed on the same side of the cell body, the multiple tabs including a first set of tabs and a second set of tabs; a restraining member located on the side of the cell body with tabs, the restraining member including a side plate and a bottom plate, the side plate being disposed around the outer periphery of the bottom plate and the bottom plate and the side plate defining a mounting groove, the bottom plate having a first through groove and a second through groove, the first set of tabs passing through the first through groove, the second set of tabs passing through the second through groove; and an end cap assembly disposed on the side of the restraining member away from the cell body, the end cap assembly including an adapter, the adapter being located in the mounting groove and between the first through groove and the second through groove, the opposite ends of the adapter being electrically connected to the first set of tabs and the second set of tabs, respectively.

Description

Technical Field

[0001] This application relates to the field of energy storage, specifically to a single battery, an energy storage device, an energy storage system, and a power supply system. Background Technology

[0002] Currently, the capacity of individual battery cells is increasing, leading to larger cell sizes (such as blade batteries). This increased size necessitates larger assembly allowances, making the electrode components prone to movement relative to the casing after assembly. This affects the stability of the internal structure and electrical connections of the individual battery. Related technologies incorporate restraint components within the individual battery cell to constrain the tabs, limit the relative position of the cell and casing, and insulate the cell body from the end cap assembly. However, the interference from these restraint components necessitates increasing the length of the tabs. In related technologies, the relatively long length of the tabs and adapters within the individual battery results in higher internal resistance, which is detrimental to improving the energy efficiency of the individual battery. Summary of the Invention

[0003] Therefore, this application provides a single-cell battery with relatively short tabs and adapters, resulting in low internal resistance.

[0004] In a first aspect, embodiments of this application provide a single-cell battery, the single-cell battery comprising: A housing having a receiving cavity; A battery cell is disposed within the receiving cavity. The battery cell includes a battery cell body electrically connected to a plurality of electrodes. The plurality of electrodes are disposed on the same side of the battery cell body. The battery cell body and the plurality of electrodes are arranged along a first direction. The plurality of electrodes include a first set of electrodes and a second set of electrodes. A restraining member is located on the side of the battery cell body with the tabs. The restraining member includes a side plate and a bottom plate. The side plate surrounds the outer periphery of the bottom plate, and the bottom plate and the side plate define a mounting groove. The mounting groove is disposed away from the battery cell body. The bottom plate has a first through groove and a second through groove. Both the first through groove and the second through groove extend along a second direction. The first through groove and the second through groove are spaced apart along a third direction and communicate with the mounting groove respectively. A first set of tabs passes through the first through groove, and a second set of tabs passes through the second through groove. The first direction, the second direction, and the third direction intersect each other. An end cap assembly is disposed on the side of the restraint member away from the cell body. The end cap assembly includes an adapter, which is located in the mounting groove and is positioned upward along the third direction between the first through groove and the second through groove. The opposite ends of the adapter are electrically connected to the first set of electrodes and the second set of electrodes, respectively.

[0005] Furthermore, the adapter includes a first electrical connection portion, a second electrical connection portion, and a third electrical connection portion that are bent and connected in sequence. The first electrical connection portion and the third electrical connection portion are bent relative to the second electrical connection portion in a direction closer to the battery cell body. The first electrical connection portion is disposed near the first through groove and is electrically connected to the first set of tabs. The third electrical connection portion is disposed near the second through groove and is electrically connected to the second set of tabs.

[0006] Furthermore, the restraint member also includes a first guide plate and a second guide plate, the first guide plate and the second guide plate being spaced apart on the surface of the base plate facing the mounting groove, the first guide plate being arranged around the outer periphery of the first through groove, the second guide plate being arranged around the outer periphery of the second through groove, and the adapter being located between the first guide plate and the second guide plate and spaced apart from the first guide plate and the second guide plate respectively.

[0007] Furthermore, the distance between the first guide plate and the first electrical connection part is H1, and the total thickness of the first set of electrodes is h1, then H1 > 2h1; The distance between the second guide plate and the third electrical connection part is H2, and the total thickness of the first set of electrodes is h2, then H2 > 2h2.

[0008] Furthermore, the end face of the first guide plate facing away from the base plate is lower than the opening of the mounting groove, and the end face of the second guide plate facing away from the base plate is lower than the opening of the mounting groove; the end of the side plate facing away from the cell body abuts against the end cap assembly.

[0009] Furthermore, the dimension of the first through groove along the second direction is greater than the dimension of the first set of electrode tabs along the second direction, and the dimension of the second through groove along the second direction is greater than the dimension of the second set of electrode tabs along the second direction; the dimension of the first through groove along the third direction is greater than the dimension of the first set of electrode tabs along the third direction, and the dimension of the second through groove along the third direction is greater than the dimension of the second set of electrode tabs along the third direction; wherein, the first direction, the second direction, and the third direction intersect each other.

[0010] Furthermore, the first set of electrodes includes multiple electrodes stacked sequentially along a third direction. The dimensions of the multiple electrodes in the first set of electrodes along the second direction are equal. The dimension of a single electrode in the first set of electrodes along the second direction is L11. The misalignment of the multiple electrodes in the first set of electrodes is ΔL11 = (the dimension of the first set of electrodes along the second direction - the dimension of a single electrode along the second direction). The dimension of the first through groove along the second direction is L21. Then L21 ≥ L11 + 2 × ΔL11. And / or, The second set of electrodes includes multiple electrodes stacked sequentially along a third direction. The dimensions of the multiple electrodes in the second set of electrodes are equal along the second direction. The dimension of a single electrode in the second set of electrodes along the second direction is L12. The misalignment of the multiple electrodes in the second set of electrodes is △L12 = (the dimension of the second set of electrodes along the second direction - the dimension of a single electrode along the second direction). The dimension of the second through groove along the second direction is L22. Then L22 ≥ L12 + 2 × △L12.

[0011] Furthermore, the first electrical connection portion is perpendicular to the second electrical connection portion, and the third electrical connection portion is perpendicular to the second electrical connection portion; And / or, one end of the first set of tabs away from the cell body is connected to the surface of the first electrical connection portion away from the third electrical connection portion, and one end of the second set of tabs away from the cell body is connected to the surface of the third electrical connection portion away from the first electrical connection portion.

[0012] Furthermore, the end cap assembly also includes a top cap, a lower plastic, and an electrode post; the lower plastic is disposed between the top cap and the adapter; a portion of the electrode post is located between the adapter and the lower plastic and is electrically connected to the adapter, and another portion of the electrode post passes through the lower plastic and the top cap in sequence; there is a gap between the plurality of electrode tabs and the lower plastic.

[0013] Further, at least one of the first set of tabs and the second set of tabs includes a root, a first part, a second part, a third part, a fourth part, and an end portion connected in sequence. The end of the root facing away from the first part is connected to the battery cell body. The first part passes through the first through groove or the second through groove. The first part, the second part, the third part, the fourth part, and the end portion are bent and connected in sequence. The first part and the third part are bent towards the same side relative to the second part, and the second part and the fourth part are bent towards opposite directions relative to the third part. The third part and the end portion are bent towards the same side relative to the fourth part. The end portion is connected to the first electrical connection part or the third electrical connection part. The third part, the fourth part, and the end portion are all located between the first through groove and the first electrical connection part, or the third part, the fourth part, and the end portion are all located between the second through groove and the third electrical connection part.

[0014] Secondly, embodiments of this application provide an energy storage device, which includes: one or more single-cell batteries as described in embodiments of this application.

[0015] Thirdly, this application provides an energy storage system, which includes: a high-voltage cable, a first power conversion device, a second power conversion device, and the energy storage device described in this application embodiment; the high-voltage cable is electrically connected to the energy storage device, the first power conversion device, and the second power conversion device respectively, the first power conversion device and the second power conversion device are both used to generate electrical energy, and the energy storage device is used to store the electrical energy.

[0016] Fourthly, embodiments of this application provide a power supply system, which includes: Electrical equipment; and The energy storage device or energy storage system described in the embodiments of this application is used to supply power to the electrical equipment.

[0017] In this embodiment, the single battery cell includes a casing, a cell, a restraining member, and an end cap assembly. The cell includes an electrically connected cell body and multiple tabs. The multiple tabs include a first set of tabs and a second set of tabs. When the multiple tabs are divided into two groups and passed through a first through slot and a second through slot respectively, and then electrically connected to the same adapter, the length of the multiple tabs can be shortened, the current path between the adapter and the two sets of tabs is shorter, the energy efficiency is higher, and the utilization rate of the tabs is improved. In addition, the adapter is located between the first through slot and the second through slot, which can shorten the size of the adapter in the arrangement direction of the first through slot and the second through slot, further shorten the current transmission path from the tab to the terminal of the end cap assembly, reduce the internal resistance of the single battery cell, accelerate the current transmission efficiency of the single battery cell, and improve the energy efficiency of the single battery cell. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an energy storage system according to an embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the power supply system according to an embodiment of this application.

[0021] Figure 3This is a schematic diagram of the structure of an energy storage device according to an embodiment of this application.

[0022] Figure 4 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application.

[0023] Figure 5 This is a schematic diagram of the exploded structure of a single cell battery according to the first embodiment of this application.

[0024] Figure 6 This is a schematic diagram of the structure of a battery cell body according to an embodiment of this application.

[0025] Figure 7 This is a schematic diagram of the structure of a restraint member according to an embodiment of this application.

[0026] Figure 8 This is a structural schematic diagram of a restraint member according to an embodiment of this application from another perspective.

[0027] Figure 9 The restraint member of one embodiment of this application Figure 7 A cross-sectional view along the AA direction.

[0028] Figure 10 The restraint member of one embodiment of this application Figure 7 Cross-sectional stereoscopic view along the AA direction.

[0029] Figure 11 This is a schematic diagram of the structure of a restraint member according to another embodiment of this application.

[0030] Figure 12a This is a structural schematic diagram from another perspective of the restraint member according to yet another embodiment of this application.

[0031] Figure 12b This is a structural schematic diagram of the restraint member from another perspective, representing yet another embodiment of this application.

[0032] Figure 13 This is a schematic diagram of the planar structure of a single battery cell according to an embodiment of this application.

[0033] Figure 14 The edge of a single cell battery according to an embodiment of this application Figure 13 A partial schematic diagram of the cross-sectional structure in the CC direction.

[0034] Figure 15 This is a schematic diagram of the structure of the restraint component, electrode lug, and adapter component after assembly, from one perspective.

[0035] Figure 16 This is a structural schematic diagram from another perspective of the assembled restraints, tabs, and adapters of this application.

[0036] Figure 17Assembled along the edge of the restraint member, electrode lug, and adapter member according to an embodiment of this application. Figure 15 Cross-sectional view along the BB direction.

[0037] Figure 18 Assembled along the edge of the restraint member, electrode lug, and adapter member according to another embodiment of this application Figure 15 Cross-sectional view along the BB direction.

[0038] Figure 19 This is a schematic diagram of the exploded structure of a single cell battery according to the second embodiment of this application.

[0039] Figure 20 This is another perspective of the exploded structure of a single cell battery according to the second embodiment of this application.

[0040] Figure 21 This is a schematic diagram of the exploded structure of a single cell battery according to the third embodiment of this application.

[0041] Figure 22 This is an exploded structural diagram of a single cell battery according to another perspective of the third embodiment of this application.

[0042] Figure 23 This is a structural schematic diagram of the restraint member from another perspective, representing yet another embodiment of this application.

[0043] Figure 24 This is a schematic diagram of the exploded structure of a single cell battery according to the fourth embodiment of this application.

[0044] Figure 25 This is an exploded structural diagram of a single cell battery according to another perspective of the fourth embodiment of this application.

[0045] Figure 26 for Figure 24 Enlarged view of dashed box I.

[0046] Figure 27 The following are cross-sectional views of a first insulating film and a second insulating film according to an embodiment of this application, wherein (a) is a cross-sectional view of the first insulating film and (b) is a cross-sectional view of the second insulating film.

[0047] Figure 28 This is a schematic diagram of the exploded structure of a single cell battery according to the fifth embodiment of this application.

[0048] Figure 29 This is a schematic diagram of the exploded structure of a single cell battery according to the sixth embodiment of this application.

[0049] Figure 30 This is a schematic diagram of the electrode tabs of this application passing through the through groove, wherein (a) is the first set of electrode tabs passing through the first through groove, and (b) is the second set of electrode tabs passing through the second through groove.

[0050] Figure 31 Assembled along the edge of the restraint member, electrode lug, and adapter member according to an embodiment of this application. Figure 15 A cross-sectional view along the DD direction.

[0051] Figure 32 This is a schematic diagram of the exploded structure of a single cell battery according to the seventh embodiment of this application.

[0052] Figure 33 This is a schematic diagram of the first or second set of electrodes assembled in a single cell according to this application.

[0053] Figure 34 This is a schematic diagram of the structure of an adapter according to an embodiment of this application.

[0054] Figure 35 The edge of a single cell battery according to an embodiment of this application Figure 13 A partial schematic diagram of the cross-sectional structure along the EE direction.

[0055] Figure 36 Assembled along the edge of the restraint member, electrode lug, and adapter member according to another embodiment of this application Figure 15 Cross-sectional view along the BB direction.

[0056] Figure 37 This is a schematic diagram of the structure of an embodiment of the present application, showing the electrode tab passing through the through groove and welded to the adapter, with the end cap assembly and housing not assembled.

[0057] Explanation of reference numerals in the attached figures: 100 - Energy storage system, 110 - High-voltage cable, 120 - First energy conversion device, 130 - Second energy conversion device, 200 - Energy storage device, 300 - Power supply system, 310 - Electrical equipment, 400 - Single battery cell, 410 - Housing, 411 - Receiving cavity, 412 - First side, 413 - Second side, 420 - Battery cell, 421 - Battery cell body, 4211 - Positive electrode plate, 4212 - Separator, 4213 - Negative electrode plate, 60 - Tab, 60a - First tab, 60b - Second tab, 60a1 - Positive tab, 60a2 - Negative tab, 6 1-First set of tabs, 611-Root, 612-First part, 613-Second part, 614-Third part, 615-Fourth part, 616-End, 62-Second set of tabs, 621-First solder mark, 430-End cap assembly, 430a-First end cap assembly, 430b-Second end cap assembly, 431-Adapter, 4311-First electrical connection, 4312-Second electrical connection, 4313-Third electrical connection, 431a1-First positive adapter, 431a2-First negative adapter, 431b1-Second positive adapter, 431b2-Second negative adapter Adapter, 432-Top cover, 433-Lower plastic, 434-Pole post, 435-Explosion-proof valve, 440-First air guide plate, 441-First exhaust channel, 450-Second air guide plate, 451-Second exhaust channel, 460-First insulating film, 461-First insulating layer, 462-First adhesive layer, 470-Second insulating film, 471-Second insulating layer, 472-Second adhesive layer, 401-Second solder mark, 500-Fixing component, 501-Mounting groove, 510-Side plate, 511-First through hole, 512-First end, 513-Second end, 520-Base plate 521-Through groove, 521a-First through groove, 521b-Second through groove, 522-Accommodation groove, 523-Bottom, 5231-First base part, 5232-Second base part, 5233-Third base part, 5234-Fourth base part, 5235-Protrusion, 524-Boss, 526-Second through hole, 530-Guide plate, 530a-First guide plate, 530b-Second guide plate, 531-Through groove, 531a-First through groove, 531b-Second through groove, 532a-First arc transition surface, 532b-Second arc transition surface. Detailed Implementation

[0058] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0059] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0060] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0061] It should be noted that, for ease of explanation, the same reference numerals denote the same components in the embodiments of this application, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0062] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve energy efficiency, it is necessary to store one form of energy in the same way or by converting it into another, and then release it in a specific energy form based on future application needs. Currently, the main way to generate green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels.

[0063] 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.

[0064] 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.

[0065] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, and consumption-side energy storage. The corresponding types of energy storage devices include: (1) Large-scale energy storage power stations (including multiple prefabricated energy storage modules) 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 renewable energy absorption capacity, 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. (2) The energy storage prefabricated cabin applied on the grid side mainly functions as peak regulation, frequency regulation and grid congestion relief. In terms of peak regulation, it 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. (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.

[0066] In some embodiments, see Figure 1 , Figure 1 This is a schematic diagram of the structure of an energy storage system 100 according to an embodiment of this application, and this application Figure 1 The embodiments are illustrated using a shared energy storage scenario on the power generation / distribution side as an example. The energy storage device 200 in this application is not limited to a prefabricated energy storage module in a power generation / distribution energy storage scenario.

[0067] This application provides an energy storage system 100, which includes: a high-voltage cable 110, a first power conversion device 120, a second power conversion device 130, and an energy storage device 200 provided in this application. In some embodiments of the power generation scenario, the second power conversion device 130 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 200 through grid connection. The energy storage device 200 is connected to the high-voltage cable 110 and outputs smooth electricity to the power consumption side of the distribution network, realizing peak shaving and frequency regulation, and stable grid operation; or, wind power conversion... The power conversion device is always connected to the high-voltage cable 110. Under normal power generation conditions, the power output of the wind power conversion device is supplied to the power consumption side of the distribution network through the high-voltage cable 110. When the current power load is low and the wind power conversion device generates excess power, the excess power is first stored in the energy storage device 200 to reduce wind and solar curtailment rates and improve the problem of new energy power generation consumption. When the power load is high, the power grid issues an instruction to transmit the power stored in the energy storage device 200 together with the high-voltage cable 110 in grid-connected mode to supply 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.

[0068] In some embodiments on the distribution network side, the first power conversion device 120 can be a photovoltaic panel, and the energy storage device 200 is connected to the high-voltage cable 110 and installed downstream of the high-voltage cable 110 between the user load and the photovoltaic power conversion device. The electrical energy output by the photovoltaic power conversion device is stored in the energy storage device 200, which can respond in a timely manner to act as a backup power source when the power grid / distribution network fails; or, it can provide power supply support to alleviate line congestion when the high-voltage cable 110 transmission line is blocked, and to delay the economic pressure caused by the expansion of the power grid / distribution capacity when the power grid is planned to be expanded.

[0069] Optionally, the first power conversion device 120 may include, but is not limited to, a photovoltaic panel, and the second power conversion device 130 may include, but is not limited to, a wind power conversion device. The first power conversion device 120 and the second power conversion device 130 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy.

[0070] Optionally, the energy storage device 200 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.

[0071] Figure 2This is a schematic diagram of the power supply system 300 according to an embodiment of this application.

[0072] This application embodiment also provides a power supply system 300, which includes an electrical device 310 and an energy storage device 200 or an energy storage system 100 as described in this application embodiment, wherein the energy storage device 200 or the energy storage system 100 is used to supply power to the electrical device 310.

[0073] Optionally, the electrical equipment 310 may be, but is not limited to, at least one of the following: power grid, base station, household appliances (such as air conditioners, lamps, refrigerators, etc.), commercial charging equipment (such as photovoltaic energy storage charging stations).

[0074] It should be noted that when the power supply system 300 includes the energy storage system 100, the electrical equipment 310 is electrically connected to the high-voltage cable 110 of the energy storage system.

[0075] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of an energy storage device 200 according to an embodiment of this application.

[0076] Optionally, the energy storage device 200 may include, but is not limited to, one or more individual battery cells 400.

[0077] The term "multiple" refers to two or more, such as, but not limited to, 2, 5, 10, 30, 50, 100, 200, 300, 400, 800, 1000, etc. The number of individual battery cells 400 included in the energy storage device 200 can be determined based on the rated capacity of the individual battery cells 400 and the rated capacity to be achieved by the energy storage device 200.

[0078] It should be noted that when the energy storage device 200 includes a single battery cell 400, the energy storage device 200 can exist in the form of a single battery cell 400. When the energy storage device 200 includes multiple single batteries 400, the multiple single batteries 400 can be stacked, arranged, assembled, and other processes to form battery integrated systems such as battery modules, battery packs, battery clusters, power banks, energy storage cabinets / prefabricated energy storage compartments. In other words, the energy storage device 200 can exist in the form of, but is not limited to, battery integrated systems such as battery modules, battery packs, battery clusters, power banks, energy storage cabinets / prefabricated energy storage compartments. The actual application form of the energy storage device 200 provided in this application embodiment can be, but is not limited to, the listed products, and can also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 200.

[0079] Optionally, the single cell 400 can be, but is not limited to, at least one of cylindrical, prismatic, blade, prism, or other shaped cells.

[0080] Optionally, the single cell 400 can be a rechargeable battery, which refers to a single cell 400 that can be recharged after discharge to activate the active materials and continue to be used. The single cell 400 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application does not specifically limit it.

[0081] Currently, the capacity of individual batteries is increasing, which leads to the size of individual batteries (such as blade batteries) becoming larger and larger. As a result, the volume of individual batteries is increasing, and the larger volume requires a larger assembly margin. This makes it easy for the electrode components to wobble relative to the housing after they are assembled, which affects the stability of the internal structure of the individual battery and the stability of the electrical connection.

[0082] Please see Figure 4 and Figure 5 This application provides a single-cell battery 400, which includes: a housing 410, a cell 420, a restraining member 500, and an end cap assembly 430; the housing 410 has a receiving cavity 411, the cell 420 is disposed in the receiving cavity 411, and the cell 420 includes a cell body 421 and a tab 60 electrically connected thereto, the cell body 421 and the tab 60 being connected along a first direction (e.g., Figure 4 (As indicated by the double arrow X) arrangement; the restraint member 500 is located inside the receiving cavity 411 and on the side of the cell body 421 with the tab 60, the tab 60 passes through the restraint member 500, the end cap assembly 430 is disposed on the side of the restraint member 500 away from the cell body 421, the end cap assembly 430 includes an adapter 431, the adapter 431 is located on the side of the restraint member 500 away from the cell body 421 and is electrically connected to the tab 60.

[0083] Understandably, the battery cell 420, the restraint member 500, and the end cap assembly 430 are arranged sequentially along the first direction.

[0084] It should be noted that the restraint member 500 is insulating; in other words, the restraint member 500 is an insulating member and is made of insulating material.

[0085] Understandably, the tab 60 passes through the restraint member 500, one end of the tab 60 is electrically connected to the battery cell body 421, and the other end of the tab 60 passes through the restraint member 500 and is electrically connected to the adapter 431.

[0086] It should be noted that the restraint member 500 can limit the relative position of the battery cell 420 and the housing 410, preventing the battery cell 420 from rotating relative to the housing 410.

[0087] Please see Figure 6 Optionally, the battery cell body 421 includes a positive electrode plate 4211, a separator 4212, and a negative electrode plate 4213, with the separator 4212 disposed between the positive electrode plate 4211 and the negative electrode plate 4213. There are multiple tabs 60, some of which are electrically connected to the positive electrode plate 4211, and others are electrically connected to the negative electrode plate 4213. The tab 60 electrically connected to the positive electrode plate 4211 is called the positive tab, and the tab 60 electrically connected to the negative electrode plate 4213 is called the negative tab. It should be noted that the tab 60 electrically connected to the positive electrode plate 4211 and the tab 60 electrically connected to the negative electrode plate 4213 are different tabs 60, not different parts of the same tab 60.

[0088] Optionally, the tab 60 can be at least one of a positive tab and a negative tab. When the tab 60 includes both a positive tab and a negative tab, there are multiple tabs 60, some of which are positive tabs and some of which are negative tabs. Understandably, both the positive tab and the negative tab can be tabs 60.

[0089] Optionally, the adapter 431 can be a positive adapter or a negative adapter. That is, the adapter 431 that is electrically connected to the positive ear is a positive adapter, and the adapter 431 that is electrically connected to the negative ear is a negative adapter.

[0090] Optionally, the cell body 421 includes a plurality of positive electrode plates 4211, a plurality of separators 4212 and a plurality of negative electrode plates 4213. The positive electrode plates 4211 and the negative electrode plates 4213 are stacked alternately in sequence, and the separators 4212 are provided between adjacent positive electrode plates 4211 and negative electrode plates 4213.

[0091] It should be noted that the number of end cap assemblies 430 can be one or two. When there is only one end cap assembly 430, the receiving cavity 411 is a receiving cavity 411 with an opening at one end, and the end cap assembly 430 is disposed on one side of the housing 410 to close the opening of the receiving cavity 411. When there are two end cap assemblies 430, the receiving cavity 411 is a receiving cavity 411 with openings at both opposite ends, and the two end cap assemblies 430 are respectively disposed on opposite sides of the housing 410 to close the openings on opposite sides of the receiving cavity 411. It should be noted that the end cap assembly 430 is connected to the housing 410.

[0092] Optionally, the housing 410 may be made of, but is not limited to, aluminum or aluminum alloy. That is, the housing 410 is conductive.

[0093] The single-cell battery 400 of this application includes a casing 410, a cell 420, a restraining member 500, and an end cap assembly 430. The restraining member 500 is disposed between the cell 420 and the end cap assembly 430. By providing the restraining member 500, one end of the cell 420 can be clamped, limiting the relative position of the cell 420 and the casing 410, preventing the cell 420 from shaking relative to the casing 410 during use and transportation, thus improving the structural stability and electrical connection stability of the single-cell battery 400. In addition, the restraining member 500 allows the tab 60 to pass through and extend to the side of the restraining member 500 away from the cell body 421, thereby restraining the tab 60 and preventing it from becoming scattered or misaligned, which would affect the connection between the tab 60 and the cell body 420. The adapter 431 provides stability; furthermore, the restraint 500 isolates the tab 60, adapter 431, and housing 410, preventing the tab 60 from touching the housing 410 and causing a short circuit when it shakes. It also prevents a short circuit caused by the tab 60 being inserted upside down into the cell body 421 when it is too long. The restraint 500 also prevents direct contact short circuits between the cell body 421 and the end cap assembly 430. Furthermore, the separator 4212 of the cell body 421 is usually designed to be relatively long for safety. A clearance space can be provided on the side of the restraint 500 facing the cell body 421 to accommodate the extra separator 4212, preventing it from being squeezed by the restraint 500, reducing the possibility of damage to the separator 4212, and reducing the risk of material falling out of the cell body 421. In addition, during electrolyte filling (i.e., electrolyte injection) of the single cell 400, the restraint 500 can also prevent the electrolyte from impacting the cell body 421.

[0094] Incorporating a restraining component within a single battery cell can effectively constrain the tabs, limit the relative position of the cell and the casing, and insulate the cell body from the end cap assembly. However, in related technologies, the restraining component only has a through slot for the tabs to pass through. After the tabs pass through the slot, they are welded to an adapter, and then the end cap assembly is welded to the casing. Due to the long length of the tabs, they fold randomly within the restraining component, significantly increasing the internal resistance of the single battery cell and reducing its energy efficiency and lifespan. Therefore, this application also provides a restraining component.

[0095] Please see Figure 7 , Figure 8 and Figure 9This application embodiment also provides a restraint member 500, which includes a side plate 510, a bottom plate 520, and a guide plate 530. The side plate 510 is disposed around the outer periphery of the bottom plate 520, and the bottom plate 520 and the side plate 510 define a mounting groove 501. The bottom plate 520 has a through groove 521, which communicates with the mounting groove 501. The guide plate 530 protrudes from the surface of the bottom plate 520 facing the mounting groove 501 and is disposed around the outer periphery of the through groove 521.

[0096] It should be noted that the side plate 510 protrudes in a direction away from the cell body 421 relative to the bottom plate 520, so that the side plate 510 and the bottom plate 520 form a mounting groove 501. Understandably, the side plate 510 and the bottom plate 520 are bent and connected.

[0097] Optionally, the side plate 510, the bottom plate 520, and the guide plate 530 are an integral structure, and the side plate 510, the bottom plate 520, and the guide plate 530 are different parts of the same component. The restraint member 500 can be formed using an integral molding process, such as an integral injection molding process, to form the side plate 510, the bottom plate 520, and the guide plate 530 in the same process.

[0098] In some embodiments, the guide plate 530 is an annular structure. In other embodiments, the guide plate 530 may be a sheet-like structure.

[0099] Optionally, the side plate 510 has a ring structure.

[0100] It should be noted that the side plate 510 is arranged around the outer periphery of the guide plate 530.

[0101] It should be noted that when the restraint member 500 is assembled with the single cell 400, the mounting groove 501 of the restraint member 500 is positioned away from the cell body 421, and the electrode 60 passes through the through groove 521 of the restraint member 500 and is partially located within the mounting groove 501. The adapter 431 is disposed in the mounting groove 501 and is electrically connected to the electrode 60 passing through the through groove 521.

[0102] Optionally, the opening of the mounting slot 501 is positioned away from the cell body 421.

[0103] The restraining member 500 of this application includes a side plate 510, a bottom plate 520, and a guide plate 530. The side plate 510 is disposed around the outer periphery of the bottom plate 520, and the bottom plate 520 and the side plate 510 define a mounting groove 501. The bottom plate 520 has a through groove 521, which communicates with the mounting groove 501. The guide plate 530 protrudes from the surface of the bottom plate 520 facing the mounting groove 501 and is disposed around the outer periphery of the through groove 521. When the restraining member 500 of this application is applied to a single battery cell 400, it can clamp one end of the cell 420, limiting the relative position of the cell 420 and the casing 410, preventing the cell 420 from shaking relative to the casing 410 during use and transportation, and thus improving the structural stability and electrical connection stability of the single battery cell 400. The restraint member 500 of this application has a guide plate 530 protruding from the outer periphery of the through groove 521. The guide plate 530 can guide and support the tab 60 passing through the through groove 521, so that after the single cell 400 is assembled, the tab 60 can be bent in an orderly manner within the single cell 400, reducing the internal resistance of the single cell 400 and improving its service life. In addition, when the cell 420 is first placed on the housing 410 and then the tab 60 is welded to the adapter 431 of the end cover assembly 430, the tab 60 needs to be designed to be longer due to the interference of the housing 410. However, a longer tab 60 is prone to inserting into the cell body 421 when bending, increasing the risk of short circuit in the single cell 400. By setting the restraint member 500, the tab 60 can be effectively prevented from being inserted backward into the cell body 421, improving the safety of the single cell 400.

[0104] Please see again Figure 8 and Figure 9 In some embodiments, the base plate 520 defines a receiving groove 522, the mounting groove 501 and the receiving groove 522 are arranged along a first direction and are respectively located on opposite sides of the base plate 520, and the receiving groove 522 communicates with the through groove 521.

[0105] Understandably, the mounting groove 501, the through groove 521, and the receiving groove 522 are arranged sequentially along the first direction, and the through groove 521 connects the mounting groove 501 and the receiving groove 522.

[0106] In this embodiment, by providing a receiving groove 522 on the side of the base plate 520 away from the mounting groove 501, when the restraint member 500 is assembled to the single cell 400, the receiving groove 522 can be used to accommodate the electrode tab 60 electrically connected to the root of the cell body 421, thereby making the structure of the single cell 400 more compact, improving the utilization rate of the internal space of the single cell 400, and increasing the volumetric energy density of the single cell 400.

[0107] Please see again Figure 9 In some embodiments, the radial dimension of the receiving groove 522 gradually increases in the direction from the mounting groove 501 to the receiving groove 522 (i.e., from the restraint member 500 to the cell body 421).

[0108] It can also be understood that the depth of the receiving groove 522 gradually decreases along the first direction from the position near the through groove 521 to the direction away from the through groove 521.

[0109] The tabs 60 passing through the through slot 521 typically include multiple tabs 60 stacked together. Along the stacking direction of the multiple tabs 60, each tab 60 is electrically connected to a different position on the cell body 421. Therefore, the distance between each tab 60 and the through slot 521 is different. Multiple tabs 60 extend and converge into the through slot 521 before passing through it. Consequently, along the stacking direction of the multiple tabs 60, fewer tabs 60 are stacked further away from the through slot 521, and more tabs 60 are stacked closer to the through slot 521. In this embodiment, by gradually increasing the radial dimension of the receiving slot 522 in the direction from the guide plate 530 to the cell body 421, the receiving slot 522 can better guide the tabs 60 and better facilitate the orderly arrangement and stacking of multiple tabs 60 before passing through the through slot 521.

[0110] In some embodiments, the number of the receiving groove 522, the through groove 521, and the guide plate 530 is one. This ensures that the tabs 60 located on the same side of the cell body 421 all pass through the receiving groove 522, the through groove 521, and the guide plate 530, which simplifies the design of the single cell 400.

[0111] Please see again Figure 7 and Figure 9 In other embodiments, there are multiple receiving slots 522, multiple through slots 521, and multiple guide plates 530, with each receiving slot 522, through slot 521, and guide plate 530 corresponding to the others; the through slots 521 are arranged along a second direction (e.g., Figure 4 and Figure 9 Extending (as indicated by the double arrow Y), at least a portion of the plurality of through slots 521 are along a third direction (e.g., Figure 4 and Figure 9 As indicated by the double arrow Z, the multiple through slots 521 are arranged symmetrically along an axis parallel to the second direction and along an axis parallel to the third direction, wherein the first direction, the second direction and the third direction intersect each other.

[0112] exist Figure 7 and Figure 8 In this embodiment, there are two receiving slots 522, two through slots 521, and two guide plates 530. The receiving slots 522, the through slots 521, and the guide plates 530 are arranged in a one-to-one correspondence. The through slots 521 extend along a second direction, and the two through slots 521 are spaced apart along a third direction. The two through slots 521 are arranged symmetrically along an axis parallel to the second direction and symmetrically along an axis parallel to the third direction.

[0113] It should be noted that one receiving slot 522 corresponds to one through slot 521, and different receiving slots 522 correspond to different through slots 521. One guide plate 530 corresponds to one through slot 521, and different guide plates 530 correspond to different through slots 521.

[0114] In one example, there are two through slots 521, which are spaced apart along a third direction. In another example, there are four through slots 521, which are arranged in an array, with some through slots 521 spaced apart along a second direction and some through slots 521 spaced apart along a third direction.

[0115] Optionally, the first direction, the second direction, and the third direction are perpendicular to each other. Optionally, the first direction is the length direction of the single cell 400, the second direction is the width direction of the single cell 400, and the third direction is the thickness direction of the single cell 400.

[0116] In this embodiment, by designing different numbers of receiving slots 522, through slots 521, and guide plates 530, the restraint member 500 can better match single-cell batteries 400 with different structures, thus making the restraint member 500 applicable to more application scenarios. Furthermore, by symmetrically arranging multiple through slots 521 along an axis parallel to the second direction and along an axis parallel to the third direction, when electrodes 60 with the same polarity (e.g., positive or negative electrodes) are divided into two groups, each passing through two through slots 521 and then electrically connected to the same adapter 431, the length of the two groups of electrodes 60 can be shortened, the current path between the adapter 431 and the two groups of electrodes 60 is shorter, energy efficiency is higher, and the utilization rate of the electrodes 60 is improved.

[0117] Please see Figures 9 to 12a In some embodiments, the base plate 520 further includes at least two connected bottoms 523, each bottom 523 having a through groove 521 and a receiving groove 522, and a guide plate 530 is provided on the outer periphery of each through groove 521; The bottom 523 includes a first bottom portion 5231, a second bottom portion 5232, a third bottom portion 5233, and a fourth bottom portion 5234. The first bottom portion 5231, the second bottom portion 5232, the third bottom portion 5233, and the fourth bottom portion 5234 are sequentially bent and connected to form the through groove 521 and the receiving groove 522. The first bottom portion 5231 and the third bottom portion 5233 are spaced apart along a second direction, and the second bottom portion 5232 and the fourth bottom portion 5234 are spaced apart along a third direction. The first bottom portion 5231, the second bottom portion 5232, the third bottom portion 5233, and the fourth bottom portion 5234 are spaced apart along a third direction. 32. One end of the third base portion 5233 and the fourth base portion 5234 are both bent and connected to the guide plate 530. In the direction from the mounting groove 501 to the receiving groove 522 (i.e., the first direction), the distance between the second base portion 5232 and the fourth base portion 5234 gradually increases. At least a portion of the bottom 523 of at least two bottoms 523 are arranged along a third direction. The fourth base portions 5234 of two adjacent bottoms 523 are bent and connected along the third direction to form a protrusion 5235. The first direction, the second direction and the third direction intersect each other.

[0118] Optionally, at least two bottoms 523 are arranged symmetrically along an axis parallel to the second direction and symmetrically along an axis parallel to the third direction. In one example, the base plate 520 includes two bottoms 523 (e.g., Figure 7 and Figure 8 As shown), two bottoms 523 are arranged and connected along a third direction. In another example, the base plate 520 includes four bottoms 523 (as shown). Figure 11 and Figure 12a As shown), the four bottom 523 arrays are arranged and connected as one unit. Optionally, the four bottom 523 arrays are arranged along the second direction and the third direction.

[0119] Optionally, the first base portion 5231 and the third base portion 5233 are arranged in parallel.

[0120] Understandably, the protrusion 5235 protrudes toward the side opposite to the mounting groove 501, and the protrusion 5235 extends along the second direction and is located between two adjacent receiving grooves 522 along the third direction.

[0121] Optionally, along the third direction upward, the two fourth base portions 5234 of two adjacent bottoms 523 are connected, and the connection point of the two fourth base portions 5234 of two adjacent bottoms 523 forms the protrusion 5235 protruding in a direction away from the mounting groove 501.

[0122] Understandably, in this embodiment, the guide plate 530 has a ring structure.

[0123] The base plate 520 of this embodiment includes at least two bottoms 523. Each bottom 523 includes a first bottom portion 5231, a second bottom portion 5232, a third bottom portion 5233, and a fourth bottom portion 5234. The first bottom portion 5231, the second bottom portion 5232, the third bottom portion 5233, and the fourth bottom portion 5234 are sequentially bent and connected to form the through groove 521 and the receiving groove 522. The first bottom portion 5231 and the third bottom portion 5233 are spaced apart along a second direction, and the second bottom portion 5232 and the fourth bottom portion 5234 are spaced apart along a third direction. One end of each of the first bottom portion 5231, the second bottom portion 5232, the third bottom portion 5233, and the fourth bottom portion 5234 is bent and connected to the guide plate 530. By designing the structure of the bottom 523 and the connection structure between the bottom 523 and the guide plate 530, the fabrication of the restraint member 500 can be simplified. In addition, the design of the structure of the bottom 523 and the guide plate 530 can also strengthen the base plate 520, giving it better mechanical strength. Furthermore, by designing the structure of the bottom 523, the fourth base portion 5234 of the two bottoms 523 are bent and connected to directly form the protrusion 5235, which can better improve the space utilization of the restraint member 500. When the restraint member 500 is applied to the single cell 400, it can better improve the volumetric energy density of the single cell 400. In addition, the tabs 60 passing through the through slot 521 typically include multiple tabs 60 stacked together. Each tab 60 is electrically connected to a different position on the battery cell body 421. Therefore, the distance between each tab 60 and the through slot 521 is different. After multiple tabs 60 are concentrated in the through slot 521, they pass through the through slot 521. The number of tabs 60 stacked is less at the position farther away from the through slot 521, and the number of tabs 60 stacked is more at the position closer to the through slot 521. In this embodiment, by making the distance between the second base portion 5232 and the fourth base portion 5234 gradually increase in the direction from the mounting slot 501 to the receiving slot 522, the receiving slot 522 can better guide the tabs 60, and can better arrange and stack multiple tabs 60 in an orderly manner before passing through the through slot 521. Furthermore, when the restraint member 500 is assembled onto the single cell 400, the protrusion 5235 abuts against the cell body 421, thereby better preventing the cell body 421 from moving relative to the housing 410 in the first direction. In addition, the inner walls of the two receiving grooves 522 on both sides of the protrusion 5235 near the cell body 421 also abut against the cell body 421, further restricting the movement of the cell body 421 relative to the housing 410 in the second and third directions. Through the cooperation between the protrusion 5235 and the inner wall of the receiving groove 522, the position of the cell body 421 can be better constrained and restricted.

[0124] Please see again Figure 12b In some embodiments, the base plate 520 includes at least two bottoms 523 and a plurality of bosses 524. Each bottom 523 has a through groove 521 and a receiving groove 522. A guide plate 530 is provided on the outer periphery of each through groove 521. A portion of at least two bottoms 523 is spaced apart along a second direction. Along the second direction, the bottoms 523 and the bosses 524 are alternately arranged and connected in sequence.

[0125] Understandably, along the second direction, the boss 524 and the receiving groove 522 are alternately arranged.

[0126] Optionally, two bottoms 523 are provided between two adjacent bosses 524 along the second direction, and the two bottoms 523 are arranged and connected along the third direction.

[0127] like Figure 8 As shown, in one example, the base plate 520 includes two bottoms 523 and two bosses 524. The two bosses 524 are spaced apart along a second direction, and the two bottoms 523 are located between the two bosses 524. The two bottoms 523 are arranged and connected along a third direction, and the two bosses 524 are connected to the opposite ends of each bottom 523.

[0128] like Figure 12b As shown, in another example, the base plate 520 includes four bottoms 523 and three bosses 524. The three bosses 524 are arranged at intervals along the second direction. There are two bottoms 523 arranged and connected along the third direction between two adjacent bosses 524. The opposite ends of each bottom 523 are connected to the adjacent bosses 524.

[0129] Optionally, the end face of the boss 524 facing the cell body 421 is flush with the end face of the protrusion 5235 near the cell body 421.

[0130] In this embodiment, by providing multiple bosses 524 on the base plate 520, when the restraint member 500 is assembled to the single battery cell 400, the bosses 524 abut against the cell body 421, thereby better preventing the cell body 421 from moving relative to the housing 410 in the first direction; in addition, the inner wall of the receiving groove 522 near the cell body 421 also abuts against the cell body 421, further restricting the movement of the cell body 421 relative to the housing 410 in the second and third directions. Through the cooperative action of the bosses 524, the protrusions 5235, and the inner wall of the receiving groove 522, the position of the cell body 421 can be better constrained and restricted.

[0131] Please see again Figure 9 and Figure 10 In some embodiments, the side plate 510 protrudes relative to the bottom plate 520 in a first direction toward a direction away from the mounting groove 501.

[0132] In this embodiment, the side plate 510 protrudes from the bottom plate 520 in a first direction away from the mounting groove 501. When the restraint member 500 is installed on the single cell 400, the tab 60 passes through the receiving groove 522 and the through groove 521 in sequence, bypasses the guide plate 530 and enters the mounting groove 501. The surface of the cell body 421 facing the end cap assembly 430 abuts against the bottom plate 520 of the restraint member 500. The part of the side plate 510 that protrudes from the bottom plate 520 in a first direction away from the mounting groove 501 is located on the side of the cell body 421, thereby limiting the cell body 421 in the second direction and the third direction, better preventing the cell body 421 from moving relative to the shell 410 during use and transportation, and improving the stability of the single cell 400.

[0133] Please see again Figure 9 and Figure 10 In some embodiments, along the first direction, the end face of the guide plate 530 facing away from the base plate 520 is lower than the opening of the mounting groove 501.

[0134] Understandably, the entire guide plate 530 is housed within the mounting slot 501. The end face of the guide plate 530 facing away from the base plate 520 is closer to the cell body 421 than the end face of the side plate 510 facing away from the cell body 421.

[0135] In this embodiment, by ensuring that the end face of the guide plate 530 facing away from the base plate 520 is lower than the opening of the mounting groove 501, when the restraint member 500 is installed on the single cell 400, it can better prevent the tab 60 from abutting against the lower plastic of the end cap assembly 430, thus preventing interference with the end cap assembly 430 and affecting its installation. Furthermore, the side plate 510 can better isolate the tab 60, better preventing it from contacting the housing 410 and causing a short circuit in the single cell 400.

[0136] Please see again Figure 7 and Figure 8 In some embodiments, the side plate 510 includes a plurality of first through holes 511 spaced apart. The bottom plate 520 includes a plurality of second through holes 526 spaced apart.

[0137] Optionally, the radial dimension of the first through hole 511 is smaller than the width of the tab 60, and the radial dimension of the second through hole 526 is smaller than the width of the tab 60. This better prevents the tab 60 from passing through the first through hole 511 or the second through hole 526.

[0138] Optionally, the shape of the first through hole 511 can be, but is not limited to, a regular or irregular shape such as a circle, rectangle, star, or ellipse. The shape of the second through hole 526 can be, but is not limited to, a regular or irregular shape such as a circle, rectangle, star, or ellipse.

[0139] Optionally, a plurality of first through holes 511 are spaced apart along the extension direction of the side plate 510, and a plurality of second through holes 526 can be arranged in an array.

[0140] Optionally, the second base portion 5232, the fourth base portion 5234, and the boss 524 each have a plurality of second through holes 526.

[0141] In this embodiment, a first through hole 511 is provided in the side plate 510, and a second through hole 526 is provided in the bottom plate 520. This allows the electrolyte to reach the cell 420 more quickly through the restraint member 500 during electrolyte injection into the single cell 400, improving the efficiency of electrolyte injection into the single cell 400. Furthermore, the first through hole 511 and the second through hole 526 can serve as venting channels in the event of thermal runaway in the single cell 400, increasing the permeability and venting effectiveness within the single cell 400, improving the venting rate of the single cell 400, and better preventing safety accidents such as explosions caused by trapped gas during thermal runaway, thus improving the safety of the single cell 400 in use.

[0142] Please see again Figure 5 , Figure 13 and Figure 14 In some embodiments, the end cap assembly 430 further includes a top cap 432, a lower plastic 433, and a terminal post 434. The lower plastic 433 is disposed between the top cap 432 and the adapter 431. A portion of the terminal post 434 is located between the lower plastic 433 and the adapter 431, and another portion passes through the lower plastic 433 and the top cap 432 in sequence. The terminal post 434 is electrically connected to the adapter 431. The base plate 520 abuts against the battery cell 420, and the side plate 510 abuts against the top cap 432 or the lower plastic 433 at one end opposite to the battery cell body 421. Figure 14 In the accompanying drawings, the side plate 510 is shown abutting against the lower plastic 433 at one end away from the cell body 421, which should not be construed as a limitation on the single cell 400 of this application embodiment.

[0143] Optionally, the end of the pole post 434 near the adapter 431 passes through the adapter 431 and is connected to the adapter 431 by welding.

[0144] Optionally, the terminal 434 can be either a positive terminal or a negative terminal. Understandably, both the positive and negative terminals are terminal 434. The terminal 434 electrically connected to the positive terminal adapter is called the positive terminal, and the terminal 434 electrically connected to the negative terminal adapter is called the negative terminal.

[0145] Optionally, the top cover 432 is connected to the housing 410 by welding.

[0146] In this embodiment, by having the bottom plate 520 of the restraint member 500 abut against the cell 420, and the side plate 510 of the restraint member 500 abut against the top cover 432 or the lower plastic 433, the cell 420 can be better restrained in the first direction, preventing the cell 420 from shaking during use or transportation, and improving the stability of the internal structure and electrical connection of the single battery cell 400. Furthermore, the restraint member 500 and the lower plastic 433 are both insulating components. Through the cooperation of the restraint member 500 and the lower plastic 433, the tab 60 and the adapter 431 can be enclosed in the mounting groove 501 (i.e., the tab 60 and the adapter 431 are surrounded by insulating components), thereby better isolating the housing 410 and the top cover 432, preventing the housing 410 and the top cover 432 from contacting each other and avoiding short circuits between them.

[0147] Please see also Figure 5 , Figure 15 and Figure 16 In some embodiments, the number of tabs 60 is multiple, and the multiple tabs 60 include a first group of tabs 61 and a second group of tabs 62; the through groove 521 includes a first through groove 521a and a second through groove 521b; the guide plate 530 includes a first guide plate 530a and a second guide plate 530b; the restraint member 500 includes a first through groove 521a and a second through groove 521b arranged along a third direction, and a first guide plate 530a and a second guide plate 530b arranged at intervals along a third direction; the first guide plate 530a is disposed around the outer periphery of the first through groove 521a, and the second guide plate 530b is disposed around the outer periphery of the second through groove 521b; the first group of tabs 61 passes through the first through groove 521a, and the second group of tabs 62 passes through the second through groove 521b. The adapter 431 includes a first electrical connection portion 4311, a second electrical connection portion 4312, and a third electrical connection portion 4313 that are bent and connected in sequence. The first electrical connection portion 4311 and the third electrical connection portion 4313 are bent relative to the second electrical connection portion 4312 in a direction closer to the battery cell body 421. The first electrical connection portion 4311 is disposed near the first through groove 521a and is electrically connected to the first set of electrode tabs 61. The second electrical connection portion 4312 is electrically connected to the electrode post 434. The third electrical connection portion 4313 is disposed near the second through groove 521b and is electrically connected to the second set of electrode tabs 62.

[0148] Optionally, the first group of electrodes 61 includes a plurality of electrodes 60 stacked together. The second group of electrodes 62 includes a plurality of electrodes 60 stacked together.

[0149] Optionally, the first set of electrodes 61 can be either a positive electrode or a negative electrode, and the second set of electrodes 62 can be either a positive electrode or a negative electrode.

[0150] It should be noted that the first group of electrodes 61 and the second group of electrodes 62 both refer to electrodes 60, or electrodes 60 composed of multiple electrodes 60. The terms "first" and "second" are only used to distinguish electrodes 60 in different positions.

[0151] It should be noted that both the first through groove 521a and the second through groove 521b are through grooves 521. The terms "first" and "second" are used only to distinguish through grooves 521 in different positions.

[0152] It should be noted that both the first guide plate 530a and the second guide plate 530b are guide plates 530. The terms "first" and "second" are used only to distinguish guide plates 530 in different positions.

[0153] Understandably, the first electrical connection portion 4311 and the third electrical connection portion 4313 are located on the same side of the second electrical connection portion 4312.

[0154] Optionally, the pole 434 passes through the second electrical connection portion 4312 and is electrically connected to the second electrical connection portion 4312.

[0155] Understandably, adapter 431 has a "U-shaped" structure.

[0156] Understandably, the first electrical connection 4311 and the third electrical connection 4313 are spaced apart along a third direction.

[0157] In this embodiment, the multiple tabs 60 are divided into a first group of tabs 61 and a second group of tabs 62. After passing through the first through groove 521a and the second through groove 521b respectively, the first group of tabs 61 and the second group of tabs 62 are electrically connected to the same adapter 431. Compared with the scheme where multiple tabs 60 are stacked as a bundle and directly electrically connected to the adapter 431, the first group of tabs 61 and the second group of tabs 62 in this embodiment can be made shorter, thereby shortening the flow path, improving the energy efficiency of the single cell 400, and improving the utilization rate of the tabs 60. Furthermore, when the single cell 400 experiences thermal runaway, the cell 420 will float towards the end cap assembly 430, causing the restraint member 500 to deform / float. The U-shaped upright arm of the adapter 431 (i.e., the first electrical connection part 4311 and the third electrical connection part 4313) can provide support, preventing the exhaust channel of the end cap assembly 430 from being blocked, ensuring the stability of the exhaust space inside the single cell 400, and improving the safety of using the single cell 400.

[0158] Please see also Figure 15 and Figure 17 In some embodiments, the adapter 431 is located between the first guide plate 530a and the second guide plate 530b, and the first guide plate 530a is spaced apart from the first electrical connection portion 4311, and the second guide plate 530b is spaced apart from the third electrical connection portion 4313.

[0159] It should be noted that the space between the first guide plate 530a and the first electrical connection part 4311 is used to accommodate a portion of the first set of tabs 61, and the space between the second guide plate 530b and the third electrical connection part 4313 is used to accommodate a portion of the second set of tabs 62.

[0160] It should be noted that when the first set of tabs 61 is electrically connected to the first electrical connection portion 4311, the end of the first set of tabs 61 facing away from the battery cell body 421 is welded to the end of the first electrical connection portion 4311 facing away from the second electrical connection portion 4312; when the second set of tabs 62 is electrically connected to the third electrical connection portion 4313, the end of the second set of tabs 62 facing away from the battery cell body 421 is welded to the end of the third electrical connection portion 4313 facing away from the second electrical connection portion 4312. The portion of the first set of tabs 61 near the middle is housed in the space between the first guide plate 530a and the first electrical connection portion 4311, and the portion of the second set of tabs 62 near the middle is housed in the space between the second guide plate 530b and the third electrical connection portion 4313.

[0161] In this embodiment, the adapter 431 is located between the first guide plate 530a and the second guide plate 530b, with the first guide plate 530a and the first electrical connection portion 4311 spaced apart, and the second guide plate 530b and the third electrical connection portion 4313 spaced apart. This allows the first set of tabs 61 and the second set of tabs 62 to be bent in an orderly manner after the single cell 400 is assembled, through the cooperation of the first guide plate 530a, the second guide plate 530b and the adapter 431. Furthermore, a portion of the first set of tabs 61 after being bent in an orderly manner can be accommodated in the gap between the first guide plate 530a and the first electrical connection portion 4311, and a portion of the second set of tabs 62 after being bent in an orderly manner can be accommodated in the gap between the second guide plate 530b and the third electrical connection portion 4313. This avoids the increase in resistance and the reduction in the lifespan of the single cell 400 caused by disordered bending of the first set of tabs 61 and the second set of tabs 62.

[0162] Please see Figure 18 In other embodiments, the first electrical connection portion 4311 is located on the side of the first guide plate 530a opposite to the second guide plate 530b and is spaced apart from the first guide plate 530a; the third electrical connection portion 4313 is located on the side of the second guide plate 530b opposite to the first guide plate 530a and is spaced apart from the second guide plate 530b.

[0163] It should be noted that the space between the first guide plate 530a and the first electrical connection part 4311 is used to accommodate a portion of the first set of tabs 61, and the space between the second guide plate 530b and the third electrical connection part 4313 is used to accommodate a portion of the second set of tabs 62.

[0164] In this embodiment, the first electrical connection portion 4311 is located on the side of the first guide plate 530a opposite to the second guide plate 530b and is spaced apart from the first guide plate 530a; the third electrical connection portion 4313 is located on the side of the second guide plate 530b opposite to the first guide plate 530a and is spaced apart from the second guide plate 530b. This allows the first set of tabs 61 and the second set of tabs 62 to be bent in an orderly manner after the single cell 400 is assembled, through the cooperation of the first guide plate 530a, the second guide plate 530b and the adapter 431. Moreover, a portion of the first set of tabs 61 after being bent in an orderly manner can be accommodated in the gap between the first guide plate 530a and the first electrical connection portion 4311, and a portion of the second set of tabs 62 after being bent in an orderly manner can be accommodated in the gap between the second guide plate 530b and the third electrical connection portion 4313, thereby avoiding the increase in resistance and the reduction in the life of the single cell 400 caused by disorderly bending of the first set of tabs 61 and the second set of tabs 62.

[0165] Compared to Figure 18 The plan, Figure 17 The proposed solution can better shorten the length of the adapter 431, reduce the current path, lower the internal resistance of the single cell 400, and improve the energy efficiency of the single cell 400.

[0166] Please see also Figure 7 , Figure 17 and Figure 18 In some embodiments, the surface of the second electrical connection portion 4312 facing away from the base plate 520 is lower than the opening of the mounting groove 501; or, the surface of the second electrical connection portion 4312 facing away from the base plate 520 is flush with the opening of the mounting groove 501.

[0167] Understandably, the surface of the second electrical connection portion 4312 facing away from the base plate 520 is closer to the cell body 421 than the surface of the cell body 421 of the side plate 510.

[0168] In this embodiment, the surface of the second electrical connection portion 4312 facing away from the base plate 520 is lower than the opening of the mounting groove 501, or the surface of the second electrical connection portion 4312 facing away from the base plate 520 is flush with the opening of the mounting groove 501. This facilitates the assembly of the end cap assembly 430. In addition, after the single cell 400 is assembled, the second electrical connection portion 4312 of the adapter 431 abuts against the lower plastic 433, improving the stability of the abutment between the end cap assembly 430, the restraint member 500 and the cell body 421.

[0169] Please see Figure 19 and Figure 20 In some embodiments, the tab 60 includes a first tab 60a and a second tab 60b, which are located on opposite sides of the cell body 421 along a first direction. At least one of the first tab 60a and the second tab 60b includes a first set of tabs 61 and a second set of tabs 62. The end cap assembly 430 includes a first end cap assembly 430a and a second end cap assembly 430b, where the first end cap assembly 430a is located on the side of the cell body 421 having the first tab 60a. The adapter 431 of the first end cap assembly 430a is electrically connected to the first tab 60a; the second end cap assembly 430b is located on the side of the cell 420 with the second tab 60b, and the adapter 431 of the second end cap assembly 430b is electrically connected to the second tab 60b; the single cell 400 includes a restraint member 500, which is disposed between the first end cap assembly 430a and the cell body 421, and the length of the first tab 60a is greater than the length of the second tab 60b.

[0170] Optionally, the first electrode 60a may include a first set of electrodes 61 and a second set of electrodes 62; or, the second electrode 60b may include a first set of electrodes 61 and a second set of electrodes 62; or, both the first electrode 60a and the second electrode 60b may include a first set of electrodes 61 and a second set of electrodes 62.

[0171] It should be noted that the first electrode 60a and the second electrode 60b both refer to electrode 60, or electrode 60 composed of multiple electrodes 60. The terms "first" and "second" are only used to distinguish electrodes 60 in different positions.

[0172] It should be noted that both the first end cap assembly 430a and the second end cap assembly 430b are end cap assemblies 430.

[0173] Understandably, the first end cap assembly 430a includes an adapter 431, a top cover 432, a lower plastic 433, and a terminal post 434. The lower plastic 433 is disposed between the top cover 432 and the adapter 431. A portion of the terminal post 434 is located between the lower plastic 433 and the adapter 431, and another portion passes through the lower plastic 433 and the top cover 432 in sequence. The terminal post 434 is electrically connected to the adapter 431. The second end cap assembly 430b includes an adapter 431, a top cover 432, a lower plastic 433, and a terminal post 434. The lower plastic 433 is disposed between the top cover 432 and the adapter 431. A portion of the terminal post 434 is located between the lower plastic 433 and the adapter 431, and the other portion passes through the lower plastic 433 and the top cover 432 in sequence. The terminal post 434 is electrically connected to the adapter 431.

[0174] In this embodiment, by providing a restraining member 500, the position of the cell 420 and the casing 410 can be effectively restricted, preventing the cell 420 from rotating during the use or transportation of the single battery 400, thereby improving the structural stability and electrical connection stability of the single battery 400. Furthermore, compared to a scheme where restraining members 500 are provided at both ends of the cell body 421, providing a restraining member 500 at only one end of the cell body 421 allows for a better reduction in the volume of the single battery 400 and an increase in its volumetric energy density. Additionally, the length of the first tab 60a is greater than the length of the second tab 60b. The longer length of the first tab 60a facilitates its insertion through the through-slot 521 of the restraining member 500 and its electrical connection with the adapter 431. The shorter length of the second tab 60b helps to shorten the current path, reduce the internal resistance of the single battery 400, and improve its energy efficiency.

[0175] Please see Figure 21 and Figure 22In other embodiments, the tab 60 includes a first tab 60a and a second tab 60b, which are located on opposite sides of the cell body 421 along a first direction. Both the first tab 60a and the second tab 60b include a first set of tabs 61 and a second set of tabs 62. The end cap assembly 430 includes a first end cap assembly 430a and a second end cap assembly 430b. The first end cap assembly 430a is located on the side of the cell body 421 with the first tab 60a, and the adapter 431 of the first end cap assembly 430a is electrically connected to the first tab 60a. The second end cap assembly 430b is located on the side of the cell 420 with the second tab 60b, and the adapter 431 of the second end cap assembly 430b is electrically connected to the second tab 60b. The single battery cell 400 includes two binding members 500. One of the binding members 500 is disposed between the first end cap assembly 430a and the cell body 421, and the other of the binding members 500 is disposed between the second end cap assembly 430b and the cell body 421. The length of the first tab 60a is equal to the length of the second tab 60b.

[0176] In this embodiment, by setting two restraint members 500, the position of the cell 420 and the casing 410 can be effectively restricted, preventing the cell 420 from rotating during the use or transportation of the single battery 400, thereby improving the structural stability and electrical connection stability of the single battery 400. Furthermore, it can better insulate the first tab 60a and the second tab 60b, better preventing reverse insertion of the first tab 60a and the second tab 60b, preventing short circuits in the single battery 400, and improving the safety of the single battery 400 in use. In addition, the length of the first tab 60a is equal to the length of the second tab 60b, and the current paths at both ends of the single battery 400 are equal, which can better improve the consistency of the single battery 400.

[0177] Related technologies involve placing a restraining component between the cell and the end cap assembly of a single battery cell to limit the cell body from the casing and to insulate the cell body from the end cap assembly. However, the venting performance of these restraining components is poor, which is detrimental to improving the safety of single-cell battery use.

[0178] Please see also Figure 7 , Figure 8 and Figure 23This application embodiment also provides a restraint member 500, which includes a side plate 510 and a bottom plate 520. The side plate 510 is disposed around the outer periphery of the bottom plate 520, and the bottom plate 520 and the side plate 510 define a mounting groove 501. The bottom plate 520 has a through groove 521 that communicates with the mounting groove 501. The side plate 510 has a plurality of first through holes 511 spaced apart, and the first through holes 511 communicate with the mounting groove 501. The side plate 510 has a first direction (e.g., Figure 23 The first end 512 and the second end 513 are arranged opposite to each other (as indicated by the double arrow X). The first end 512 is located further away from the base plate 520 than the second end 513. The distance between the first through hole 511 and the first end 512 is less than the distance between the first through hole 511 and the second end 513.

[0179] Understandably, the opening of the mounting groove 501 is located closer to the first end 512. It is also understood that the second end 513 is closer to the base plate 520.

[0180] Understandably, the first through hole 511 is located closer to the first end 512 and further away from the second end 513.

[0181] Optionally, a plurality of first through holes 511 surround the mounting groove 501 and are spaced apart on the side plate 510.

[0182] Understandably, the first end 512 is further away from the cell body 421 than the second end 513.

[0183] For a detailed description of other aspects of the restraint member 500, please refer to the description of the corresponding part of the above embodiment, which will not be repeated here.

[0184] Optionally, the radial dimension of the first through hole 511 is smaller than the width of the tab 60. This better prevents the tab 60 from passing through the first through hole 511.

[0185] The restraint member 500 of this application embodiment includes a side plate 510 and a bottom plate 520. The side plate 510 is disposed around the outer periphery of the bottom plate 520, and the bottom plate 520 and the side plate 510 define a mounting groove 501. The side plate 510 has a first end 512 and a second end 513 disposed opposite to each other along a first direction. The first end 512 is disposed further away from the bottom plate 520 than the second end 513. The distance between the first through hole 511 and the first end 512 is less than the distance between the first through hole 511 and the second end 513. When the restraint member 500 of this application is applied to a single battery cell 400, it can clamp one end of the cell 420, limit the relative position of the cell 420 and the casing 410, and prevent the cell 420 from shaking relative to the casing 410 during use and transportation, thereby improving the structural stability and electrical connection stability of the single battery cell 400. In this embodiment, multiple first through holes 511 are provided on the side plate 510. When the single cell 400 is filled with electrolyte, the electrolyte can pass through the restraint member 500 to the cell 420 more quickly, improving the efficiency of electrolyte filling of the single cell 400. In addition, the first through holes 511 can serve as lateral venting channels when the single cell 400 experiences thermal runaway, increasing the permeability and venting effectiveness of the single cell 400, improving the venting rate of the single cell 400, and better preventing safety accidents such as explosions caused by trapped gas when the single cell 400 experiences thermal runaway, thereby improving the safety of the single cell 400 in use. Furthermore, since the mounting groove 501 is positioned away from the cell body 421, meaning the first end 512 is further away from the cell body 421 than the second end 513, and the first through hole 511 is positioned closer to the first end 512, a larger space can be reserved on the outer wall of the side plate 510 to accommodate the first insulating film 460, the second insulating film 470, the first air guide plate 440, and the second air guide plate 450 (e.g., Figure 24 and Figure 25 (as shown) and other components, without blocking the first through hole 511 and affecting the smoothness of the exhaust of the first through hole 511. This can better maintain the smooth exhaust of the single cell 400, and also allow the side plate 510 to have a larger contact area with the first insulating film 460, the second insulating film 470, the first air guide plate 440 and the second air guide plate 450, thereby improving the stability of the connection between the restraint member 500 and the first insulating film 460, the second insulating film 470, the first air guide plate 440 and the second air guide plate 450.

[0186] Please see again Figure 23 In some embodiments, the distance between the first through hole 511 and the first end 512 is d1, and the distance between the first through hole 511 and the second end 513 is d2, then 0.2≤d1 / d2≤0.5.

[0187] Understandably, the ratio of the distance d1 between the first through hole 511 and the first end 512 to the distance d2 between the first through hole 511 and the second end 513 is in the range of 0.2 to 0.5.

[0188] Specifically, d1 / d2 can be, but is not limited to, 0.2, 0.23, 0.25, 0.28, 0.3, 0.33, 0.35, 0.38, 0.4, 0.43, 0.45, 0.48, 0.5, etc.

[0189] In this embodiment, if d1 / d2 is too small, the first through hole 511 will be too close to the first end portion 512, increasing the difficulty of processing the first through hole 511 and reducing the structural stability of the restraint member 500. If d1 / d2 is too large, the first through hole 511 will be too close to the second end portion 513, and the distance between the second through hole 526 and the second end portion 513 will be too short, leaving too little area for other components such as the first insulating film 460, the second insulating film 470, the first air guide plate 440, and the second air guide plate 450 to fit together, reducing the stability of the connection between other components and the restraint member 500, or it may block the first through hole 511, which is not conducive to the smooth exhaust of the first through hole 511.

[0190] Please see again Figure 23 In some embodiments, the distance d1 between the first through hole 511 and the first end 512 is in the range of 2.5mm≤d1≤15mm.

[0191] Specifically, the distance d1 between the first through hole 511 and the first end 512 can be, but is not limited to, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, 15mm, etc.

[0192] In this embodiment, if the distance d1 between the first through hole 511 and the first end 512 is too small, it increases the difficulty of processing the first through hole 511 and reduces the structural stability of the restraint member 500. If the distance d1 between the first through hole 511 and the first end 512 is too large, it increases the height of the restraint member 500 along the first direction and reduces the energy density of the single cell 400; or, if the first through hole 511 is too close to the second end 513, it is not conducive to the bonding and connection of the restraint member 500 with other components such as the first insulating film 460, the second insulating film 470, the first air guide plate 440, and the second air guide plate 450.

[0193] Please see again Figure 23 In some embodiments, the distance d2 between the first through hole 511 and the second end 513 is in the range of 10mm≤d2≤20mm.

[0194] Specifically, the distance d2 between the first through hole 511 and the second end 513 can be, but is not limited to, 10mm, 12mm, 14mm, 15mm, 16mm, 18mm, 20mm, etc.

[0195] In this embodiment, if the distance d2 between the first through hole 511 and the second end 513 is too small, the area left for other components such as the first insulating film 460, the second insulating film 470, the first air guide plate 440, and the second air guide plate 450 to adhere is too small, reducing the stability of the connection between other components and the restraint member 500. Alternatively, it may block the first through hole 511, hindering the smooth exhaust of the first through hole 511. If the distance d2 between the first through hole 511 and the second end 513 is too large, it increases the height of the restraint member 500 along the first direction, reducing the energy density of the single cell 400.

[0196] Please see also Figure 7 , Figure 8 and Figure 23 In some embodiments, the restraint member 500 further includes a guide plate 530, which is disposed on the surface of the base plate 520 facing the mounting groove 501 and surrounds the outer periphery of the through groove 521.

[0197] In this embodiment, by providing a guide plate 530 protruding from the outer periphery of the through groove 521, the guide plate 530 can guide and support the tab 60 passing through the through groove 521, so that after the single cell 400 is assembled, the tab 60 can be bent in an orderly manner within the single cell 400, reducing the internal resistance of the single cell 400 and improving the service life of the single cell 400.

[0198] Please see also Figure 9 and Figure 23 In some embodiments, the orthographic projection of the guide plate 530 onto the surface of the side plate 510 facing the mounting groove 501 is offset from the first through hole 511.

[0199] Through groove 521 along the second direction (e.g.) Figure 23As indicated by the double arrow Y, the guide plate 530 extends around the outer periphery of the through groove 521. Therefore, the guide plate 530 also extends along the second direction. If the orthographic projection of the guide plate 530 on the surface of the side plate 510 facing the mounting groove 501 overlaps with the first through hole 511, the guide plate 530 can easily block the first through hole 511 of the restraint member 500 arranged along the second direction, thereby blocking the exhaust path and hindering the exhaust of the single cell 400 during thermal runaway. In this embodiment, by making the orthographic projection of the guide plate 530 on the surface of the side plate 510 facing the mounting groove 501 offset from the first through hole 511, when the single cell 400 experiences thermal runaway, the guide plate 530 will not extend in the second direction or the third direction (e.g., Figure 23 The exhaust path of the first through hole 511 will not be blocked (as indicated by the double arrow Z), which helps to improve the safety of the single cell 400.

[0200] Please see also Figure 7 , Figure 8 and Figure 23 In some embodiments, the base plate 520 has a plurality of second through holes 526 arranged in an array, the plurality of second through holes 526 connecting the mounting groove 501.

[0201] Optionally, the radial dimension of the second through hole 526 is smaller than the width of the tab 60. This better prevents the tab 60 from passing through the second through hole 526.

[0202] Optionally, the second through holes 526 can be arranged in an array on the base plate 520.

[0203] In this embodiment, by providing a second through hole 526 in the base plate 520, the electrolyte can reach the cell 420 more quickly through the restraint member 500 during the electrolyte injection of the single cell 400, thereby improving the efficiency of electrolyte injection of the single cell 400. In addition, the second through hole 526 can serve as a venting channel when the single cell 400 experiences thermal runaway, increasing the permeability and venting effectiveness within the single cell 400, improving the venting rate of the single cell 400, and better preventing safety accidents such as explosions caused by trapped gas when the single cell 400 experiences thermal runaway, thereby improving the safety of the single cell 400 in use.

[0204] Please see Figure 24 and Figure 25 In some embodiments, the end cap assembly 430 includes an explosion-proof valve 435, and the single battery cell 400 further includes a first vent plate 440 and a second vent plate 450, both of which are located within the receiving cavity 411. The first vent plate 440 and the second vent plate 450 are aligned along a second direction (e.g., Figure 23(Indicated by double arrow Y) are respectively disposed on opposite sides of the battery cell body 421. The first air guide plate 440 and the second air guide plate 450 are respectively connected to the side plate 510 of the restraint member 500. The first air guide plate 440 has a first exhaust channel 441, which is used to connect the receiving cavity 411 and the space of the explosion-proof valve 435 facing the battery cell 420. The second air guide plate 450 has a second exhaust channel 451, which is used to connect the receiving cavity 411 and the space of the explosion-proof valve 435 facing the battery cell 420. The first air guide plate 440 and the second air guide plate 450 are both insulating plates, wherein the first direction intersects the second direction.

[0205] It should be noted that the top cover 432 has an explosion-proof hole (not shown in the figure), and the explosion-proof valve 435 is disposed on the top cover 432 and closes the explosion-proof hole. It should also be noted that the surface of the explosion-proof valve 435 facing downwards on the plastic 433 communicates with the receiving cavity 411. Optionally, both the first end cap assembly 430a and the second end cap assembly 430b include the explosion-proof valve 435.

[0206] Optionally, both the first air guide plate 440 and the second air guide plate 450 are made of insulating material.

[0207] Optionally, the first air guide plate 440 extends from one end of the cell body 421 to the other end along the first direction, and the second air guide plate 450 extends from one end of the cell body 421 to the other end along the first direction.

[0208] Optionally, the first air guide plate 440 and the second air guide plate 450 are connected to the outer wall of the side plate 510 of the restraint member 500 by welding.

[0209] In this embodiment, by providing a first venting plate 440 and a second venting plate 450 on opposite sides of the cell body 421 along the second direction, when the single cell 400 experiences thermal runaway, the first exhaust channel 441 of the first venting plate 440 and the second exhaust channel 451 of the second venting plate 450 can discharge the generated gas in the single cell 400 to the explosion-proof valve 435 of the end cap assembly 430 through the first venting plate 440 and the second venting plate 450, which can better ensure the normal exhaust of the single cell 400; in addition, the first venting plate 440 and the second venting plate 450 are both insulating plates, which can effectively insulate the opposite sides of the cell body 421 along the second direction from the housing 410, and better prevent the housing 410 from contacting the cell body 421 and short-circuiting.

[0210] Please see again Figure 24 and Figure 25In some embodiments, the single-cell battery 400 further includes a first insulating film 460 and a second insulating film 470, both of which are located within the receiving cavity 411. The first insulating film 460 and the second insulating film 470 are aligned along a third direction (e.g., Figure 23 (As indicated by the double arrow Z) are respectively disposed on opposite sides of the battery cell body 421. The first insulating film 460 and the second insulating film 470 are respectively connected to the side plate 510 of the restraint member 500. The first insulating film 460 is connected to the first air guide plate 440 and the second air guide plate 450 at opposite ends along the second direction, and the second insulating film 470 is connected to the first air guide plate 440 and the second air guide plate 450 at opposite ends along the second direction, wherein the first direction, the second direction and the third direction intersect each other.

[0211] Optionally, the first insulating film 460 is a Mylar film, and the second insulating film 470 is a Mylar film.

[0212] Optionally, the first insulating film 460 and the second insulating film 470 can be welded to the side plate 510 of the restraint member 500.

[0213] In this embodiment, by providing the first insulating film 460 and the second insulating film 470 on opposite sides of the cell body 421 along a third direction, the opposite sides of the cell body 421 along the third direction can be well insulated from the housing 410, thus preventing short circuits between the housing 410 and the cell body 421. Furthermore, the first insulating film 460 is connected to the first air guide plate 440 and the second air guide plate 450 at opposite ends along a second direction, and the second insulating film 470 is also connected to the first air guide plate 440 and the second air guide plate 450 at opposite ends along a second direction. This allows the first insulating film 460, the second insulating film 470, the first air guide plate 440, and the second air guide plate 450 to form a closed ring, better separating and insulating the cell body 421 from the housing 410, which is beneficial for improving the safety of the single-cell battery 400.

[0214] Please see Figure 26 In some embodiments, along the second direction, one end of the first insulating film 460 extends to the side of the first air guide plate 440 away from the cell body 421 and is attached to one end of the first air guide plate 440, and one end of the first insulating film 460 extends to the side of the second air guide plate 450 away from the cell body 421 and is attached to one end of the second air guide plate 450. Along the second direction, one end of the second insulating film 470 extends to the side of the first air guide plate 440 away from the cell body 421 and is attached to the other end of the first air guide plate 440. One end of the second insulating film 470 extends to the side of the second air guide plate 450 away from the cell body 421 and is attached to the other end of the second air guide plate 450.

[0215] In this embodiment, the first insulating film 460 is partially stacked with the first air guide plate 440 and the second air guide plate 450, and the second insulating film 470 is partially stacked with the first air guide plate 440 and the second air guide plate 450. This allows the first air guide plate 440, the second air guide plate 450, the first insulating film 460, and the second insulating film 470 to be connected as a whole, which is beneficial to the insulation between the battery cell body 421 and the housing 410.

[0216] Please see also Figure 24 , Figure 25 and Figure 27 In some embodiments, the first insulating film 460 includes a first insulating layer 461 and a first adhesive layer 462 stacked together, the first adhesive layer 462 being used to adhere the first insulating film 460 to the cell body 421, the first air guide plate 440, the second air guide plate 450, and the restraining member 500; the second insulating film 470 includes a second insulating layer 471 and a second adhesive layer 472 stacked together, the second adhesive layer 472 being used to adhere the second insulating film 470 to the cell body 421, the first air guide plate 440, the second air guide plate 450, and the restraining member 500.

[0217] In this embodiment, by providing a first adhesive layer 462 and a second adhesive layer 472, the first insulating layer 461, the second insulating layer 471, the first air guide plate 440, and the second air guide plate 450 can all be fixed to the cell body 421 by the first adhesive layer 462 and the second adhesive layer 472. Furthermore, the first adhesive layer 462 and the second adhesive layer 472 can also bond the restraint member 500 to the cell body 421, better insulating the cell body 421 from the casing 410 and improving the safety of the single-cell battery 400.

[0218] Please see Figure 28In some embodiments, the end cap assembly 430 includes a first end cap assembly 430a and a second end cap assembly 430b, which are located on opposite sides of the battery cell 420 along a first direction. The number of restraining members 500 is one, and the restraining member 500 is disposed between the first end cap assembly 430a and the battery cell body 421. The second end cap assembly 430b also includes a lower plastic 433, which is located on the second end cap assembly 430a. The adapter 431 of 30b is located on the side opposite to the cell body 421; the first air guide plate 440, the second air guide plate 450, the first insulating film 460, and the second insulating film 470 are all connected to the side plate 510 of the restraint member 500 at the end near the first end cap assembly 430a, and the first air guide plate 440, the second air guide plate 450, the first insulating film 460, and the second insulating film 470 are all connected to the lower plastic 433 of the second end cap assembly 430b at the end near the second end cap assembly 430b.

[0219] In this embodiment, by connecting one end of the first air guide plate 440, the second air guide plate 450, the first insulating film 460, and the second insulating film 470 to the restraint member 500 and the other end to the lower plastic 433, the cell body 421 can be better insulated from the casing 410, thereby improving the safety of the single cell 400.

[0220] Please see again Figure 24 and Figure 25 In other embodiments, the end cap assembly 430 includes a first end cap assembly 430a and a second end cap assembly 430b, the first end cap assembly 430a and the second end cap assembly 430b being located on opposite sides of the battery cell 420 along a first direction, and the number of the restraining members 500 is two, one of the two restraining members 500 being disposed between the first end cap assembly 430a and the battery cell body 421, and the other of the two restraining members 500 being disposed between the second end cap assembly 430b and the battery cell body 421; The first air guide plate 440, the second air guide plate 450, the first insulating film 460, and the second insulating film 470 are all connected to the side plate 510 of the restraint member 500 near the first end cap assembly 430a at one end, and the first air guide plate 440, the second air guide plate 450, the first insulating film 460, and the second insulating film 470 are all connected to the side plate 510 of the restraint member 500 of the second end cap assembly 430b at one end.

[0221] In this embodiment, by having the first air guide plate 440, the second air guide plate 450, the first insulating film 460, and the second insulating film 470 each end of the first air guide plate 440, the second air guide plate 450, the first insulating film 460, and the second insulating film 470 be respectively bound by the binding members 500 on both sides of the cell body 421, the cell body 421 can be better insulated from the casing 410, thereby improving the safety of the single cell 400 in use.

[0222] Please see again Figure 4 In some embodiments, the dimension of the single cell 400 along the first direction is L, the dimension of the single cell 400 along the second direction is H, and the dimension of the single cell 400 along the third direction is D; Therefore, 4 ≤ L / H ≤ 10; And / or, 2≤H / D≤4.

[0223] Understandably, the ratio of the length L of the single cell 400 to the width H of the single cell 400 ranges from 4 to 10.

[0224] Understandably, the ratio of the width H of the single cell 400 to the thickness D of the single cell 400 ranges from 2 to 4.

[0225] Specifically, L / H can be, but is not limited to, 4, 5, 6, 7, 8, 9, 10, etc.

[0226] Specifically, H / D can be, but is not limited to, 2, 2.5, 3, 3.5, 4, etc.

[0227] In this embodiment, by designing the proportions of the dimensions of the single cell 400 along the first, second, and third directions, the single cell 400 has a better appearance and more coordinated dimensions in each direction, which is beneficial to the fabrication of the single cell 400. In addition, by making the single cell 400 into a thin strip shape, the surface area of ​​the single cell 400 can be increased, which is beneficial to improving the heat dissipation efficiency of the single cell 400.

[0228] Please see Figure 29In some embodiments, the tab 60 includes a first tab 60a and a second tab 60b, the first tab 60a and the second tab 60b being located on opposite sides of the cell body 421 along a first direction and respectively connected to the cell body 421; the end cap assembly 430 includes a first end cap assembly 430a and a second end cap assembly 430b, the first end cap assembly 430a being located on the side of the cell body 421 having the first tab 60a, and an adapter 431 of the first end cap assembly 430a being electrically connected to the first tab 60a; the second end cap assembly 430b being located on the side of the cell 420 having the second tab 60b, and an adapter 431 of the second end cap assembly 430b being electrically connected to the second tab 60b; The first tab 60a is a positive tab 60a1, the second tab 60b is a negative tab 60a2, and the restraint member 500 has two through slots 521 spaced apart along a third direction; the restraint member 500 is disposed between at least one of the first end cap assembly 430a and the second end cap assembly 430b and the cell body 421. When the restraint member 500 is located between the first end cap assembly 430a and the cell body 421, the first electrode tab 60a includes a first set of electrode tabs 61 and a second set of electrode tabs 62. The first set of electrode tabs 61 of the first electrode tab 60a is inserted through one of the two through slots 521, and the second set of electrode tabs 62 of the first electrode tab 60a is inserted through the other of the two through slots 521. When the restraint member 500 is located between the second end cap assembly 430b and the cell body 421, the second electrode tab 60b includes a first set of electrode tabs 61 and a second set of electrode tabs 62. The first set of electrode tabs 61 of the second electrode tab 60b is inserted through one of the two through slots 521, and the second set of electrode tabs 62 of the second electrode tab 60b is inserted through the other of the two through slots 521.

[0229] Understandably, the first set of electrodes 61 and the second set of electrodes 62 in the first electrode 60a are both positive electrodes 60a1; the first set of electrodes 61 and the second set of electrodes 62 in the second electrode 60b are both negative electrodes 60a2.

[0230] It should be noted that in this embodiment, the terminal 434 of the first end cap assembly 430a is the positive terminal, and the positive terminal of the second end cap assembly 430b is the negative terminal.

[0231] Please see again Figure 24 and Figure 25In some embodiments, the tab 60 includes a first tab 60a and a second tab 60b, the first tab 60a and the second tab 60b being located on opposite sides of the cell body 421 along a first direction and respectively connected to the cell body 421; the end cap assembly 430 includes a first end cap assembly 430a and a second end cap assembly 430b, the first end cap assembly 430a being located on the side of the cell body 421 having the first tab 60a; the second end cap assembly 430b being located on the side of the cell 420 having the second tab 60b; The first electrode tab 60a includes a plurality of positive electrode tabs 60a1 and a plurality of negative electrode tabs 60a2. The first end cap assembly 430a includes a first positive electrode adapter 431a1 and a first negative electrode adapter 431a2. The first positive electrode adapter 431a1 is electrically connected to the plurality of positive electrode tabs 60a1 of the first electrode tab 60a, and the first negative electrode adapter 431a2 is electrically connected to the plurality of negative electrode tabs 60a2 of the first electrode tab 60a. The second electrode tab 60b includes a plurality of positive electrode tabs 60a1 and a plurality of negative electrode tabs 60a2. The second end cap assembly 430b includes a second positive electrode adapter 431b1 and a second negative electrode adapter 431b2. The second positive electrode adapter 431b1 is electrically connected to the plurality of positive electrode tabs 60a1 of the second electrode tab 60b, and the second negative electrode adapter 431b2 is electrically connected to the plurality of negative electrode tabs 60a2 of the second electrode tab 60b. The restraining member 500 has four through slots 521 arranged in an array. The restraining member 500 is disposed between at least one of the first end cap assembly 430a and the second end cap assembly 430b and the battery cell body 421. When the restraint member 500 is located between the first end cap assembly 430a and the cell body 421, a portion of the plurality of positive tabs 60a1 of the first tab 60a is inserted through one of the two through slots 521, and another portion of the plurality of positive tabs 60a1 of the first tab 60a is inserted through the other of the two through slots 521; a portion of the plurality of negative tabs 60a2 of the first tab 60a is inserted through one of the other two through slots 521, and another portion of the plurality of negative tabs 60a2 of the first tab 60a is inserted through the other of the other two through slots 521. When the restraint member 500 is located between the second end cap assembly 430b and the cell body 421, a portion of the plurality of positive tabs 60a1 of the second tab 60b passes through one of the two through slots 521, and another portion of the plurality of positive tabs 60a1 of the second tab 60b passes through the other of the two through slots 521; a portion of the plurality of negative tabs 60a2 of the second tab 60b passes through one of the other two through slots 521, and another portion of the plurality of negative tabs 60a2 of the second tab 60b passes through the other of the other two through slots 521.

[0232] It should be noted that the multiple positive tabs 60a1 of the first tab 60a are electrically connected to the multiple positive electrode plates 4211, and the multiple positive tabs 60a1 of the second tab 60b are electrically connected to the multiple positive electrode plates 4211; in other words, each positive electrode plate 4211 has a positive tab 60a1 at both ends along the first direction, the positive tab 60a1 near the first end cap assembly 430a serves as the positive tab 60a1 of the first tab 60a, and the positive tab 60a1 near the second end cap assembly 430b serves as the positive tab 60a1 of the second tab 60b.

[0233] It should be noted that the multiple negative tabs 60a2 of the first tab 60a are electrically connected to the multiple negative electrode plates 4213, and the multiple negative tabs 60a2 of the second tab 60b are electrically connected to the multiple negative electrode plates 4213; in other words, each negative electrode plate 4213 has a negative tab 60a2 at both ends along the first direction, the negative tab 60a2 near the first end cap assembly 430a serves as the negative tab 60a2 of the first tab 60a, and the negative tab 60a2 near the second end cap assembly 430b serves as the negative tab 60a2 of the second tab 60b.

[0234] It should be noted that the first positive electrode adapter 431a1, the first negative electrode adapter 431a2, the second positive electrode adapter 431b1, and the second negative electrode adapter 431b2 are all adapters 431.

[0235] Understandably, the plurality of positive electrodes 60a1 of the first electrode 60a includes a first group of electrodes 61 and a second group of electrodes 62, and the plurality of negative electrodes 60a2 of the first electrode 60a includes a first group of electrodes 61 and a second group of electrodes 62; the plurality of positive electrodes 60a1 of the second electrode 60b includes a first group of electrodes 61 and a second group of electrodes 62, and the plurality of negative electrodes 60a2 of the second electrode 60b includes a first group of electrodes 61 and a second group of electrodes 62.

[0236] Optionally, the terminal 434 of the first end cap assembly 430a includes a positive terminal and a negative terminal. The positive terminal of the first end cap assembly 430a is electrically connected to the first positive terminal adapter 431a1, and the negative terminal of the first end cap assembly 430a is electrically connected to the first negative terminal adapter 431a2.

[0237] Optionally, the terminal 434 of the second end cap assembly 430b includes a positive terminal and a negative terminal. The positive terminal of the second end cap assembly 430b is electrically connected to the second positive terminal adapter 431b1, and the negative terminal of the second end cap assembly 430b is electrically connected to the second negative terminal adapter 431b2.

[0238] For a detailed description of other aspects of the first end cap assembly 430a and the second end cap assembly 430b, please refer to the description of the corresponding parts of the above embodiments, which will not be repeated here.

[0239] In this embodiment, when the single battery 400 is in use, the positive terminal of the first end cap assembly 430a and the positive terminal of the second end cap assembly 430b can be electrically connected, or both can be electrically connected to the negative terminal of another single battery 400, and the negative terminal of the first end cap assembly 430a and the negative terminal of the second end cap assembly 430b can be electrically connected, or both can be electrically connected to the positive terminal of another single battery 400.

[0240] In this embodiment, the first tab 60a includes a plurality of positive tabs 60a1 and a plurality of negative tabs 60a2, and the first end cap assembly 430a includes a first positive adapter 431a1 and a first negative adapter 431a2. The first positive adapter 431a1 is electrically connected to the plurality of positive tabs 60a1 of the first tab 60a, and the first negative adapter 431a2 is electrically connected to the plurality of negative tabs 60a2 of the first tab 60a. The second tab 60b includes a plurality of positive tabs 60a1 and a plurality of negative tabs 60a2, and the second end cap assembly 430b includes a second positive adapter 431b1 and a second negative adapter 431b2. The second positive adapter 431b1 is electrically connected to the plurality of positive tabs 60a1 of the second tab 60b, and the second negative adapter 431b2 is electrically connected to the plurality of negative tabs 60a2 of the second tab 60b. This allows the first end cap assembly 430a to include a positive terminal and a negative terminal, and the second end cap assembly 430b to also include a positive terminal and a negative terminal. The same positive electrode 4211 can be led out through the two positive terminals at both ends, and the same negative electrode 4213 can be led out through the two negative terminals at both ends. This reduces half of the current path in the single cell 400, greatly reduces the internal resistance of the single cell 400, and improves the energy efficiency of the single cell 400.

[0241] Please see again Figure 5 , Figure 15 and Figure 16In some embodiments, the number of tabs 60 is multiple, and the multiple tabs 60 include a first group of tabs 61 and a second group of tabs 62; the through groove 521 includes a first through groove 521a and a second through groove 521b; the guide plate 530 includes a first guide plate 530a and a second guide plate 530b; the restraint member 500 includes a first through groove 521a and a second through groove 521b arranged along a third direction, and a first guide plate 530a and a second guide plate 530b arranged at intervals along a third direction; the first guide plate 530a is disposed around the outer periphery of the first through groove 521a, and the second guide plate 530b is disposed around the outer periphery of the second through groove 521b; the first group of tabs 61 passes through the first through groove 521a, and the second group of tabs 62 passes through the second through groove 521b. The adapter 431 includes a first electrical connection portion 4311, a second electrical connection portion 4312, and a third electrical connection portion 4313 that are bent and connected in sequence. The first electrical connection portion 4311 and the third electrical connection portion 4313 are bent relative to the second electrical connection portion 4312 in a direction closer to the cell body 421. The first electrical connection portion 4311 is disposed near the first through groove 521a and is electrically connected to the first set of tabs 61. The second electrical connection portion 4312 is electrically connected to the pole post 434 of the end cap assembly 430. The third electrical connection portion 4313 is disposed near the second through groove 521b and is electrically connected to the second set of tabs 62.

[0242] In this embodiment, the multiple tabs 60 are divided into a first group of tabs 61 and a second group of tabs 62. After passing through the first through groove 521a and the second through groove 521b respectively, the first group of tabs 61 and the second group of tabs 62 are electrically connected to the same adapter 431. Compared with the scheme where multiple tabs 60 are stacked as a bundle and directly electrically connected to the adapter 431, the first group of tabs 61 and the second group of tabs 62 in this embodiment can be made shorter, thereby shortening the current path, improving the energy efficiency of the single cell 400, and improving the utilization rate of the tabs 60. Furthermore, when the single cell 400 experiences thermal runaway, the cell 420 will float towards the end cap assembly 430, causing the restraint member 500 to deform / float. The U-shaped upright arm of the adapter 431 (i.e., the first electrical connection part 4311 and the third electrical connection part 4313) can provide support, preventing the exhaust channel of the end cap assembly 430 from being blocked, ensuring the stability of the exhaust space inside the single cell 400, and improving the safety of using the single cell 400.

[0243] In related technologies, setting restraint components within a single battery cell can provide some restraint to the tabs, limit the relative position of the cell and the casing, and insulate the cell body from the end cap assembly. However, the interference of these restraint components necessitates increasing the length of the tabs. In these technologies, the tabs and adapters within the single battery cell are relatively long, resulting in higher internal resistance and hindering the improvement of energy efficiency.

[0244] Please see again Figure 5 , Figure 15 and Figure 16 This application also provides a single-cell battery 400, which includes a housing 410, a cell 420, a restraining member 500, and an end cap assembly 430. The housing 410 has a receiving cavity 411. The cell 420 is disposed within the receiving cavity 411. The cell 420 includes a cell body 421 electrically connected to a plurality of tabs 60. The plurality of tabs 60 are disposed on the same side of the cell body 421. The tabs 60 are arranged along a first direction, and the plurality of tabs 60 include a first group of tabs 61 and a second group of tabs 62; the restraining member 500 is located on the side of the cell body 421 with the tabs 60, and the restraining member 500 includes a side plate 510 and a bottom plate 520. The side plate 510 is arranged around the outer periphery of the bottom plate 520, and the bottom plate 520 and the side plate 510 define a mounting groove 501. The mounting groove 501 is disposed away from the cell body 421, and the bottom plate... 520 has a first through groove 521a and a second through groove 521b, both extending along a second direction. The first through groove 521a and the second through groove 521b are spaced apart along a third direction and communicate with the mounting groove 501 respectively. The first set of electrode tabs 61 passes through the first through groove 521a, and the second set of electrode tabs 62 passes through the second through groove 521b. The first direction, the second direction, and the third direction intersect each other. The end cap assembly 430 is disposed on the side of the restraint member 500 away from the cell body 421. The end cap assembly 430 includes an adapter 431, which is located in the mounting groove 501 and between the first through groove 521a and the second through groove 521b along the third direction. The opposite ends of the adapter 431 are electrically connected to the first set of electrode tabs 61 and the second set of electrode tabs 62 respectively.

[0245] Understandably, the through groove 521 includes a first through groove 521a and a second through groove 521b.

[0246] Optionally, the number of first through grooves 521a can be one or more, and the number of second through grooves 521b can be one or more. When the number of both first through grooves 521a and second through grooves 521b is multiple, the first through grooves 521a and second through grooves 521b correspond one-to-one.

[0247] Optionally, the first set of electrodes 61 includes a plurality of electrodes 60 stacked together, and the second set of electrodes 62 includes a plurality of electrodes 60 stacked together.

[0248] Understandably, the adapter 431 is located between the first set of tabs 61 and the second set of tabs 62.

[0249] Understandably, the first set of tabs 61 passes through the first through groove 521a and is electrically connected to one end of the adapter 431, and the second set of tabs 62 passes through the second through groove 521b and is electrically connected to the other end of the adapter 431.

[0250] For detailed descriptions of other aspects of the single cell 400, the restraint member 500, the tab 60, the end cap assembly 430, etc., please refer to the descriptions of the corresponding parts of the above embodiments, which will not be repeated here.

[0251] In this embodiment, the single battery cell 400 includes a housing 410, a cell 420, a restraint member 500, and an end cap assembly 430. The cell 420 includes an electrically connected cell body 421 and multiple tabs 60. The multiple tabs 60 include a first set of tabs 61 and a second set of tabs 62. When multiple tabs are divided into two groups and passed through the first through slot 521a and the second through slot 521b respectively, and then electrically connected to the same adapter 431, the length of the multiple tabs 60 can be shortened. The adapter 431 and the two sets of tabs 60 are connected... The current path is shorter, the energy efficiency is higher, and the utilization rate of the tab 60 is improved. In addition, the adapter 431 is located between the first through groove 521a and the second through groove 521b, which can shorten the size of the adapter 431 in the arrangement direction of the first through groove 521a and the second through groove 521b, further shorten the current transmission path from the tab 60 to the pole post 434 of the end cover assembly 430, reduce the internal resistance of the single cell 400, accelerate the current transmission efficiency of the single cell 400, and improve the energy efficiency of the single cell 400.

[0252] Please see also Figure 5 , Figure 15 and Figure 16In some embodiments, the adapter 431 includes a first electrical connection portion 4311, a second electrical connection portion 4312, and a third electrical connection portion 4313 that are bent and connected in sequence. The first electrical connection portion 4311 and the third electrical connection portion 4313 are bent relative to the second electrical connection portion 4312 in a direction closer to the battery cell body 421. The first electrical connection portion 4311 is disposed near the first through groove 521a and is electrically connected to the first set of tabs 61. The third electrical connection portion 4313 is disposed near the second through groove 521b and is electrically connected to the second set of tabs 62.

[0253] Optionally, the second electrical connection portion 4312 is electrically connected to the pole post 434 of the end cap assembly 430. For detailed descriptions of other aspects of the end cap assembly 430, adapter 431, pole post 434, tab 60, etc., please refer to the descriptions of the corresponding parts of the above embodiments, which will not be repeated here.

[0254] Understandably, the first electrical connection 4311 and the third electrical connection 4313 are located on the same side of the second electrical connection 4312.

[0255] Understandably, adapter 431 has a "U-shaped" structure.

[0256] In this embodiment, the adapter 431 includes a first electrical connection portion 4311, a second electrical connection portion 4312, and a third electrical connection portion 4313 that are bent and connected in sequence. The first electrical connection portion 4311 and the third electrical connection portion 4313 are located on the same side of the second electrical connection portion 4312. When the single cell 400 experiences thermal runaway, the cell 420 will float towards the end cap assembly 430, causing the restraint member 500 to deform / float. The first electrical connection portion 4311 and the third electrical connection portion 4313 of the adapter 431 can provide support, preventing the exhaust channel of the end cap assembly 430 from being blocked, ensuring the stability of the exhaust space inside the single cell 400, and improving the safety of using the single cell 400.

[0257] Please see Figures 15 to 17 In some embodiments, the restraint member 500 further includes a first guide plate 530a and a second guide plate 530b, the first guide plate 530a and the second guide plate 530b being spaced apart on the surface of the base plate 520 facing the mounting groove 501, the first guide plate 530a being arranged around the outer periphery of the first through groove 521a, the second guide plate 530b being arranged around the outer periphery of the second through groove 521b, and the adapter member 431 being located between the first guide plate 530a and the second guide plate 530b and spaced apart from the first guide plate 530a and the second guide plate 530b respectively.

[0258] Understandably, there is a gap between the first electrical connection 4311 and the first guide plate 530a for accommodating a portion of the first set of tabs 61; and there is a gap between the third electrical connection 4313 and the second guide plate 530b for accommodating a portion of the second set of tabs 62.

[0259] When the tabs 60 inside the single cell 400 are bent randomly, it will increase the internal resistance of the single cell 400 and increase the heat generation of the single cell 400.

[0260] In this embodiment, the restraint member 500 further includes a first guide plate 530a and a second guide plate 530b. The first guide plate 530a can fix and support the first set of electrode tabs 61, so that the first set of electrode tabs 61 can be bent in an orderly manner. The second guide plate 530b can fix and support the second set of electrode tabs 62, so that the second set of electrode tabs 62 can be bent in an orderly manner. Moreover, a portion of the first set of electrode tabs 61 after being bent in an orderly manner can be accommodated in the gap between the first guide plate 530a and the first electrical connection part 4311, and a portion of the second set of electrode tabs 62 after being bent in an orderly manner can be accommodated in the gap between the second guide plate 530b and the third electrical connection part 4313, thereby avoiding the increase in resistance caused by the disorderly bending of the first set of electrode tabs 61 and the second set of electrode tabs 62, and the reduction in the life of the single cell battery 400.

[0261] Please see Figure 17 In some embodiments, the distance between the first guide plate 530a and the first electrical connection portion 4311 is H1, and the total thickness of the first set of electrode tabs 61 is h1, then H1 > 2h1; The distance between the second guide plate 530b and the third electrical connection part 4313 is H2, and the total thickness of the first set of tabs 61 is h2, then H2 > 2h2.

[0262] It should be noted that the first group of tabs 61 includes multiple tabs 60, and the total thickness of the first group of tabs 61 is the thickness of the multiple tabs 60 stacked together. The second group of tabs 62 includes multiple tabs 60, and the total thickness of the second group of tabs 62 is the thickness of the multiple tabs 60 stacked together.

[0263] It should be noted that the total thickness h1 of the first group of tabs 61 is equal to the number of tabs 60 in the first group of tabs 61 × the thickness of a single layer of tabs 60.

[0264] It should be noted that the total thickness h2 of the second group of tabs 62 is equal to the number of tabs 60 in the second group of tabs 62 × the thickness of a single layer of tabs 60.

[0265] In a specific example, 2.1h1 ≤ H1 ≤ 5h1. Specifically, H1 can be, but is not limited to, 2.1h1, 2.3h1, 2.5h1, 2.8h1, 3.0h1, 3.3h1, 3.5h1, 3.8h1, 4.0h1, 4.3h1, 4.5h1, 4.8h1, 5h1, etc. If H1 is too small, it is not conducive to the orderly bending of the first set of tabs 61, increasing the internal resistance of the single cell 400 and reducing the energy efficiency of the single cell 400; if H1 is too large, the first set of tabs 61 needs to be set longer, increasing the internal resistance of the single cell 400 and reducing the energy efficiency of the single cell 400.

[0266] In a specific example, 2.1h² ≤ H² ≤ 5h². Specifically, H² can be, but is not limited to, 2.1h², 2.3h², 2.5h², 2.8h², 3.0h², 3.3h², 3.5h², 3.8h², 4.0h², 4.3h², 4.5h², 4.8h², and 5h². If H² is too small, it is not conducive to the orderly bending of the second set of tabs 62, increasing the internal resistance of the single cell 400 and reducing the energy efficiency of the single cell 400. If H² is too large, the second set of tabs 62 needs to be set longer, increasing the internal resistance of the single cell 400 and reducing the energy efficiency of the single cell 400.

[0267] In this embodiment, by making H1 > 2h1 and H2 > 2h2, the gap between the first guide plate 530a and the first electrical connection part 4311 can accommodate two layers of the first set of tabs 61, and the gap between the second guide plate 530b and the third electrical connection part 4313 can accommodate two layers of the second set of tabs 62. This allows for better guidance of the first set of tabs 61 and the second set of tabs 62 to fold in an orderly manner, thereby reducing the internal resistance of the single cell 400 and improving the energy efficiency of the single cell 400.

[0268] Please see Figure 13 , Figure 14 and Figure 17 In some embodiments, the end face of the first guide plate 530a facing away from the base plate 520 is lower than the opening of the mounting groove 501, and the end face of the second guide plate 530b facing away from the base plate 520 is lower than the opening of the mounting groove 501; the end of the side plate 510 facing away from the cell body 421 abuts against the end cap assembly 430.

[0269] Understandably, the entire guide plate 530 is housed within the mounting slot 501. The end face of the guide plate 530 facing away from the base plate 520 is closer to the cell body 421 than the end face of the side plate 510 facing away from the cell body 421. In other words, the end face of the side plate 510 facing away from the cell body 421 is farther away from the cell body 421 than the end face of the guide plate 530 facing away from the base plate 520.

[0270] Optionally, the side plate 510, at one end facing away from the cell body 421, abuts against the top cover 432 or the lower plastic 433 of the end cover assembly 430.

[0271] Optionally, the end cap assembly 430 also includes a top cover 432 and a lower plastic 433, with the lower plastic 433 located between the adapter 431 and the top cover 432, and the side plate 510 abutting against the top cover 432 or the lower plastic 433 at one end away from the cell body 421.

[0272] In this embodiment, the end face of the first guide plate 530a facing away from the base plate 520 is lower than the opening of the mounting groove 501, and the end face of the second guide plate 530b facing away from the base plate 520 is lower than the opening of the mounting groove 501. When the restraint member 500 is installed on the single cell 400, it can better prevent the first set of tabs 61 and the second set of tabs 62 from abutting against the lower plastic 433 of the end cap assembly 430, interfering with the end cap assembly 430, and affecting the installation of the end cap assembly 430. In addition, the side plate 510 can also better isolate the first set of tabs 61 and the second set of tabs 62, better preventing the first set of tabs 61 and the second set of tabs 62 from contacting the housing 410, which would cause a short circuit in the single cell 400. The side plate 510, at one end away from the cell body 421, abuts against the end cap assembly 430. This better limits the cell 420 in the first direction, preventing the cell 420 from shaking during use or transportation, and further improving the stability of the internal structure and electrical connection of the single cell 400.

[0273] Please see Figures 15 to 17 In some embodiments, the dimension of the first through groove 521a along the second direction is greater than the dimension of the first set of electrode tabs 61 along the second direction, and the dimension of the second through groove 521b along the second direction is greater than the dimension of the second set of electrode tabs 62 along the second direction; the dimension of the first through groove 521a along the third direction is greater than the dimension of the first set of electrode tabs 61 along the third direction, and the dimension of the second through groove 521b along the third direction is greater than the dimension of the second set of electrode tabs 62 along the third direction; wherein, the first direction, the second direction, and the third direction intersect each other.

[0274] Understandably, after the first set of electrode tabs 61 are inserted into the first through groove 521a, there is a gap between the first set of electrode tabs 61 and the first through groove 521a along the second direction; after the second set of electrode tabs 62 are inserted into the second through groove 521b, there is a gap between the second set of electrode tabs 62 and the second through groove 521b along the second direction.

[0275] In this embodiment, the dimension of the first through groove 521a along the second direction is larger than the dimension of the first set of tabs 61 along the second direction, and the dimension of the second through groove 521b along the second direction is larger than the dimension of the second set of tabs 62 along the second direction; the dimension of the first through groove 521a along the third direction is larger than the dimension of the first set of tabs 61 along the third direction, and the dimension of the second through groove 521b along the third direction is larger than the dimension of the second set of tabs 62 along the third direction. This can better avoid interference between the first set of tabs 61 and the inner wall of the first through groove 521a during assembly, and avoid interference between the second set of tabs 62 and the inner wall of the second through groove 521b during assembly. This allows the first set of tabs 61 to pass through the first through groove 521a more quickly, and the second set of tabs 62 to pass through the second through groove 521b more quickly, improving the assembly efficiency of the first set of tabs 61 and the second set of tabs 62, and improving the assembly efficiency of the single cell 400.

[0276] Please see Figure 30 In some embodiments, the first set of electrodes 61 includes electrodes along a third direction (e.g., Figure 30 Multiple tabs 60 are stacked sequentially (double arrow Z). The dimensions of the multiple tabs 60 in the first group 61 are equal along the second direction. Individual tabs 60 in the first group 61 are arranged along the second direction (e.g., double arrow Z). Figure 30 The dimension of the double arrow Y is L11, the misalignment of multiple electrodes 60 in the first group of electrodes 61 is △L11 = (the dimension of the first group of electrodes 61 along the second direction - the dimension of a single electrode 60 along the second direction), the dimension of the first through groove 521a along the second direction is L21, then L21 ≥ L11 + 2 × △L11.

[0277] In this embodiment, by making L21≥L11+2×△L11, interference between the first set of tabs 61 and the inner wall of the first through groove 521a can be better avoided during assembly. This allows the first set of tabs 61 to pass through the first through groove 521a more quickly, improving the assembly efficiency of the first set of tabs 61 and the assembly efficiency of the single cell 400.

[0278] Please see Figure 30 In some embodiments, the second set of electrodes 62 includes a plurality of electrodes 60 stacked sequentially along a third direction. The plurality of electrodes 60 in the second set of electrodes 62 have equal dimensions along the second direction. The dimension of a single electrode 60 in the second set of electrodes 62 along the second direction is L12. The misalignment of the plurality of electrodes 60 in the second set of electrodes 62 is ΔL12 = (the dimension of the second set of electrodes 62 along the second direction - the dimension of a single electrode 60 along the second direction). The dimension of the second through groove 521b along the second direction is L22. Then L22 ≥ L12 + 2 × ΔL12.

[0279] In this embodiment, by ensuring that L22≥L12+2×△L12, interference between the second set of tabs 62 and the inner wall of the second through groove 521b can be better avoided during assembly. This allows the second set of tabs 62 to pass through the second through groove 521b more quickly, improving the assembly efficiency of the second set of tabs 62 and thus improving the assembly efficiency of the single cell 400.

[0280] Optionally, the angle between the first electrical connection 4311 and the second electrical connection 4312 is in the range of 80° to 100° (e.g., 80°, 83°, 85°, 88°, 90°, 92°, 95°, 98°, 100°, etc.), and the angle between the third electrical connection 4313 and the second electrical connection 4312 is in the range of 80° to 100° (e.g., 80°, 83°, 85°, 88°, 90°, 92°, 95°, 98°, 100°, etc.).

[0281] Please see Figure 17 In some embodiments, the first electrical connection portion 4311 is perpendicular to the second electrical connection portion 4312, and the third electrical connection portion 4313 is perpendicular to the second electrical connection portion 4312.

[0282] Understandably, the first electrical connection portion 4311 is parallel to the third electrical connection portion 4313. The first electrical connection portion 4311 and the third electrical connection portion 4313 are arranged along a third direction.

[0283] In this embodiment, the first electrical connection 4311 is perpendicular to the second electrical connection 4312, and the third electrical connection 4313 is perpendicular to the second electrical connection 4312. This facilitates the first set of tabs 61 extending out of the first through groove 521a and the second set of tabs 62 extending out of the second through groove 521b, allowing them to extend out of the housing 410 and weld with the adapter 431, avoiding interference from other components during the welding operation. Furthermore, this also provides better support for the top cover 432, ensuring the stability of the restraint member 500 assembly. Moreover, when the single cell 400 experiences thermal runaway, the cell 420 will float towards the end cover assembly 430, causing the restraint member 500 to deform / float. The first electrical connection 4311 and the third electrical connection 4313 of the adapter 431 can provide support, preventing the exhaust channel of the end cover assembly 430 from being blocked, ensuring the stability of the exhaust space within the single cell 400, and improving the safety of the single cell 400 in use.

[0284] In some embodiments, one end of the first set of tabs 61 away from the cell body 421 is connected to the surface of the first electrical connection portion 4311 away from the third electrical connection portion 4313, and one end of the second set of tabs 62 away from the cell body 421 is connected to the surface of the third electrical connection portion 4313 away from the first electrical connection portion 4311.

[0285] Understandably, the first set of tabs 61 is welded to the end of the first electrical connection 4311 that is away from the second electrical connection 4312. The second set of tabs 62 is welded to the end of the third electrical connection 4313 that is away from the second electrical connection 4312.

[0286] In this embodiment, the end of the first set of tabs 61 facing away from the cell body 421 is connected to the surface of the first electrical connection portion 4311 facing away from the third electrical connection portion 4313, and the end of the second set of tabs 62 facing away from the cell body 421 is connected to the surface of the third electrical connection portion 4313 facing away from the first electrical connection portion 4311. The outer surface of the adapter 431 has more space, which is beneficial for welding the first set of tabs 61 and the second set of tabs 62 to the adapter 431, improving the assembly efficiency of the single cell 400; in addition, it is also beneficial for improving the welding strength between the first set of tabs 61 and the second set of tabs 62 and the adapter 431, and better avoiding cold solder joints.

[0287] Please see again Figure 5 and Figure 14 In some embodiments, the end cap assembly 430 further includes a top cap 432, a lower plastic 433, and a pole post 434; the lower plastic 433 is disposed between the top cap 432 and the adapter 431; a portion of the pole post 434 is located between the adapter 431 and the lower plastic 433 and is electrically connected to the adapter 431, and another portion of the pole post 434 passes through the lower plastic 433 and the top cap 432 in sequence; there is a gap between the plurality of tabs 60 and the lower plastic 433.

[0288] Optionally, the electrode post 434 is electrically connected to the second electrical connection portion 4312 of the adapter 431. Optionally, the electrode post 434 passes through the second electrical connection portion 4312 and is welded to the second electrical connection portion 4312.

[0289] Understandably, there is a gap between the first set of tabs 61 and the lower plastic 433, and there is also a gap between the second set of tabs 62 and the lower plastic 433.

[0290] Understandably, the portion of the first set of tabs 61 passing through the first guide plate 530a is entirely housed within the mounting groove 501 of the restraint member 500, and the portion of the second set of tabs 62 passing through the second guide plate 530b is entirely housed within the mounting groove 501 of the restraint member 500.

[0291] Understandably, the first set of tabs 61 does not contact the lower plastic 433, and the second set of tabs 62 does not contact the lower plastic 433 either.

[0292] In this embodiment, there is a gap between the plurality of tabs 60 and the lower plastic 433. This better prevents the tabs 60 from being too long and coming into contact with the lower plastic 433, which could cause disordered bending of the tabs 60 and increase the internal resistance of the single cell 400. Furthermore, if the tabs 60 are too long, they can easily come into contact with the lower plastic 433 during welding to the adapter 431. This allows the heat generated during welding to be transferred to the lower plastic 433 through the tabs 60, causing the lower plastic 433 to melt or deform. Moreover, the tabs 60... When welding with the adapter 431, if the tab 60 is too long and abuts against the lower plastic 433, the reaction force generated by the lower plastic 433 on the tab 60 will make it easy for the tab 60 and the adapter 431 to have poor welding and cause a cold weld. Furthermore, when assembling the end cap assembly 430, if the tab 60 is too long and there is no gap between the tab 60 and the lower plastic 433, the tab 60 will push against the lower plastic 433, and the lower plastic 433 will apply a certain amount of compressive force to the tab 60, which will make the weak point of the weld between the tab 60 and the adapter 431 easy to break under the action of this pressure.

[0293] Please see also Figure 14 and Figure 31 In some embodiments, at least one of the first set of tabs 61 and the second set of tabs 62 includes a root portion 611, a first portion 612, a second portion 613, a third portion 614, a fourth portion 615, and an end portion 616 connected in sequence. The end of the root portion 611 opposite to the first portion 612 is connected to the cell body 421. The first portion 612 passes through the first through groove 521a or the second through groove 521b. The first portion 612, the second portion 613, the third portion 614, the fourth portion 615, and the end portion 616 are bent and connected in sequence. The first portion 612 and the third portion 614 are respectively relative to the second portion 615. 13. The second part 613 and the fourth part 615 are bent in opposite directions relative to the third part 614. The third part 614 and the end part 616 are bent in the same direction relative to the fourth part 615. The end part 616 is connected to the first electrical connection part 4311 or the third electrical connection part 4313. The third part 614, the fourth part 615 and the end part 616 are all located between the first through groove 521a and the first electrical connection part 4311, or the third part 614, the fourth part 615 and the end part 616 are all located between the second through groove 521b and the third electrical connection part 4313.

[0294] Understandably, the third part 614, the fourth part 615, and the end part 616 are all located in the gap between the first guide plate 530a and the first electrical connection part 4311, or the third part 614, the fourth part 615, and the end part 616 are all located in the gap between the second guide plate 530b and the third electrical connection part 4313.

[0295] It should be noted that when the first set of tabs 61 includes a root 611, a first part 612, a second part 613, a third part 614, a fourth part 615, and an end 616 connected in sequence, the end of the root 611 of the first set of tabs 61 opposite to the first part 612 is connected to the battery cell body 421, and the end 616 of the first set of tabs 61 is connected to the first electrical connection part 4311. The third part 614, the fourth part 615, and the end 616 are all located between the first through groove 521a and the first electrical connection part 4311. It should also be noted that the first part 612, the third part 614, and the end 616 of the first set of tabs 61 are stacked sequentially and spaced apart along a third direction.

[0296] It should be noted that when the second set of tabs 62 includes a root portion 611, a first portion 612, a second portion 613, a third portion 614, a fourth portion 615, and an end portion 616 connected in sequence, the end of the root portion 611 of the second set of tabs 62 facing away from the first portion 612 is connected to the battery cell body 421, and the end portion 616 of the second set of tabs 62 is connected to the third electrical connection portion 4313. The third portion 614, the fourth portion 615, and the end portion 616 are all located between the second through groove 521b and the third electrical connection portion 4313. It should be noted that the first portion 612, the third portion 614, and the end portion 616 of the second set of tabs 62 are stacked sequentially and spaced apart along a third direction.

[0297] It should be noted that the tab 60, the first tab 60a, the second tab 60b, the positive tab 60a1, the negative tab 60a2, the first group of tabs 61, and the second group of tabs 62 are all tabs 60, and each can include a root 611, a first part 612, a second part 613, a third part 614, a fourth part 615, and an end 616.

[0298] In this embodiment, by designing the structure and bending shape of the first set of tabs 61 and the second set of tabs 62 after the single cell 400 is assembled, the first set of tabs 61 and the second set of tabs 62 can be bent in an orderly manner within the single cell 400, thereby better reducing the internal resistance of the single cell 400 and improving its energy efficiency and service life. Furthermore, the structural and positional design of the first set of tabs 61 and the second set of tabs 62 facilitates the welding of the first set of tabs 61 and the second set of tabs 62 to the adapter 431, and improves the welding strength between the first set of tabs 61 and the second set of tabs 62 and the adapter 431.

[0299] In related technologies, a restraint component is set between the cell and the end cap assembly of a single battery cell to limit the cell body and the casing, and to insulate the cell body and the end cap assembly, etc. The restraint component is provided with a through groove for the tabs to pass through. The tabs are usually loosely stacked in multiple layers, which are difficult to pass through the through groove in one go, reducing the assembly efficiency of the single battery cell.

[0300] Please see Figure 17 , Figure 32 and Figure 33 This application embodiment also provides a single-cell battery 400, which includes a housing 410 and a cell 420. The housing 410 has a receiving cavity 411; the cell 420 is disposed in the receiving cavity 411, and the cell 420 includes a cell body 421 electrically connected to a first set of tabs 61 and a second set of tabs 62. The first set of tabs 61 and the second set of tabs 62 are spaced apart on the same side of the cell body 421. The first set of tabs 61 includes a plurality of tabs 60 stacked together, and the second set of tabs 62 includes a plurality of tabs 60 stacked together. Both the first set of tabs 61 and the second set of tabs 62 have a first solder mark 621. The first solder mark 621 is located at the end of the first set of tabs 61 or the second set of tabs 62 away from the cell body 421, and the first solder mark 621 is used to connect the plurality of tabs 60 in the first set of tabs 61 or the second set of tabs 60b.

[0301] Understandably, the end cap assembly 430 is used to close the receiving cavity 411.

[0302] It should be noted that the first solder mark 621 of the first group of electrode tabs 61 is used to weld or connect the multiple electrode tabs 60 of the first group of electrode tabs 61, and the first solder mark 621 of the second group of electrode tabs 62 is used to weld or connect the multiple electrode tabs 60 of the second group of electrode tabs 62.

[0303] Understandably, the first set of tabs 61 and the second set of tabs 62 are respectively connected to the same adapter 431 and to opposite ends of the same adapter 431.

[0304] Optionally, the first weld mark 621 can be, but is not limited to, an ultrasonic weld mark. In other words, it is the weld mark left after welding multiple tabs 60 by ultrasonic welding.

[0305] The single-cell battery 400 of this application embodiment includes a casing 410 and a cell 420. The cell 420 includes a cell body 421 electrically connected to a first set of tabs 61 and a second set of tabs 62. The first set of tabs 61 and the second set of tabs 62 are spaced apart and disposed on the same side of the cell body 421. Both the first set of tabs 61 and the second set of tabs 62 have a first solder mark 621. The first solder mark 621 is located at the end of the first set of tabs 61 or the second set of tabs 62 away from the cell body 421. In this embodiment, by welding multiple tabs 60 of the first group of tabs 61 or multiple tabs 60 of the second group of tabs 62, and ensuring that the first weld mark 621 formed by the welding is located at the end of the first group of tabs 61 or the second group of tabs 62 away from the cell body 421 (i.e., the welding position is at the end of the first group of tabs 61 and the second group of tabs 62 away from the cell body 421), not only can the thickness of the first group of tabs 61 and / or the second group of tabs 62 be reduced, but also the looseness of the multiple tabs 60 in the first group of tabs 61 and the multiple tabs 60 in the second group of tabs 62 can be reduced. When a binding member 500 is provided between the cell body 421 and the adapter 431, the first group of tabs 61 and the second group of tabs 62 pass through the binding member 500 before welding. When using the adapter 431, it facilitates the passage of the first set of tabs 61 and the second set of tabs 62 through the restraint member 500, improving the efficiency of the first set of tabs 61 and the second set of tabs 62 through the restraint member 500 and improving the assembly efficiency of the single cell 400. In addition, by setting the first solder mark 621 at the end of the first set of tabs 61 and the second set of tabs 62 away from the cell body 421, the first solder mark 621 can avoid the bending area or bending position of the first set of tabs 61 and the second set of tabs 62, which is beneficial to the bending of the first set of tabs 61 and the second set of tabs 62 during the assembly of the single cell 400, avoiding bending of the first set of tabs 61 and the second set of tabs 62 in the area of ​​the first solder mark 621, and reducing the difficulty of bending the first set of tabs 61 and the second set of tabs 62.

[0306] Please see also Figure 32 and Figure 34In some embodiments, the end cap assembly 430 is disposed on the side of the battery cell body 421 having the first set of tabs 61 and the second set of tabs 62. The end cap assembly 430 includes an adapter 431, one end of which is electrically connected to the first set of tabs 61, and the other end of which is electrically connected to the second set of tabs 62. The adapter 431 includes a first electrical connection portion 4311, a second electrical connection portion 4312, and a third electrical connection portion 4313 that are bent and connected in sequence. The first electrical connection portion 4311 and the third electrical connection portion 4312 are connected in sequence. 3. The first electrical connection 4311 is bent towards the direction of the second electrical connection 4312 and closer to the battery cell body 421; the first electrical connection 4311 is electrically connected to the first set of electrode tabs 61, and the third electrical connection 4313 is electrically connected to the second set of electrode tabs 62; the housing 410 has a first side 412 and a second side 413 arranged opposite to each other, the adapter 431 is located between the first side 412 and the second side 413, and the first electrical connection 4311 and the third electrical connection 4313 are arranged along the arrangement direction of the first side 412 and the second side 413; The orthographic projection of the first solder mark 621 of the first set of electrode tabs 61 on the first side surface 412 overlaps with the orthographic projection of the first electrical connection portion 4311 on the first side surface 412. The orthographic projection of the first solder mark 621 of the second set of tabs 62 on the first side surface 412 overlaps with the orthographic projection of the third electrical connection portion 4313 on the first side surface 412.

[0307] Understandably, the first side 412, the first electrical connection 4311, the second electrical connection 4312, the third electrical connection 4313, and the second side 413 are arranged sequentially (i.e., arranged sequentially along the third direction). The first set of tabs 61 and the second set of tabs 62 are arranged along the arrangement direction of the first side 412 and the second side 413, with the first set of tabs 61 located close to the first electrical connection 4311 and the second set of tabs 62 located close to the third electrical connection 4313.

[0308] In this embodiment, the orthographic projection of the first solder mark 621 of the first set of tabs 61 on the first side surface 412 overlaps with the orthographic projection of the first electrical connection portion 4311 on the first side surface 412; similarly, the orthographic projection of the first solder mark 621 of the second set of tabs 62 on the first side surface 412 overlaps with the orthographic projection of the third electrical connection portion 4313 on the first side surface 412. This allows the first set of tabs 61 and the first electrical connection portion 4311 to be welded using surfaces with a large area, and the second set of tabs 62 and the third electrical connection portion 4313 to be welded using surfaces with a large area. Furthermore, when welding the first set of tabs 61 to the first electrical connection portion 4311 and the second set of tabs 62 to the third electrical connection portion 4313, welding can be performed in the area of ​​the first solder mark 621. This better avoids air bubbles between the multiple layers of tabs 60 and improves the welding yield.

[0309] Please see Figure 17 In some embodiments, the single cell 400 further has a second solder mark 401 located within the range of the first solder mark 621, and the second solder mark 401 is used to connect the first set of tabs 61 to the adapter 431 or the second set of tabs 62 to the adapter 431.

[0310] Understandably, the first set of tabs 61 and the first electrical connection portion 4311 have a second solder mark 401, which is used to weld the first set of tabs 61 and the first electrical connection portion 4311; the second set of tabs 62 and the third electrical connection portion 4313 have a second solder mark 401, which is used to weld the second set of tabs 62 and the third electrical connection portion 4313.

[0311] Understandably, when the first set of tabs 61 is welded to the first electrical connection part 4311, the welding is performed in the area of ​​the first solder mark 621 of the first set of tabs 61; when the second set of tabs 62 is welded to the third electrical connection part 4313, the welding is performed in the area of ​​the first solder mark 621 of the second set of tabs 62.

[0312] Optionally, the second weld mark 401 can be, but is not limited to, a laser weld mark.

[0313] In this embodiment, the second weld mark 401 between the first set of electrode tabs 61 and the adapter 431 is located in the area of ​​the first weld mark 621 of the first set of electrode tabs 61, or the second weld mark 401 between the second set of electrode tabs 62 and the adapter 431 is located in the area of ​​the first weld mark 621 of the second set of electrode tabs 62. Before laser welding to form the second weld mark 401, the multiple electrode tabs 60 of the first set of electrode tabs 61 and / or the second set of electrode tabs 62 are welded to form the first weld mark 621, which can better... To reduce or avoid air bubbles between multiple tabs 60 layers in the first set of tabs 61 and / or the second set of tabs 62, when laser welding is performed on the first set of tabs 61 and the first electrical connection part 4311, and the second set of tabs 62 and the third electrical connection part 4313, welding is performed in the area of ​​the first weld mark 621 to form a second weld mark 401. This can better reduce the risk of delamination caused by welding the first set of tabs 61 and the first electrical connection part 4311, and the second set of tabs 62 and the third electrical connection part 4313, and improve the welding yield of the cell 420 and the adapter 431.

[0314] Please see also Figure 31 and Figure 33 In some embodiments, at least one of the first set of tabs 61 and the second set of tabs 62 includes a root portion 611, a first portion 612, a second portion 613, a third portion 614, a fourth portion 615, and an end portion 616 connected in sequence. The end of the root portion 611 opposite to the first portion 612 is connected to the cell body 421. The first portion 612, the second portion 613, the third portion 614, the fourth portion 615, and the end portion 616 are bent and connected in sequence. The first portion 612 and the third portion 614 are bent toward the same side relative to the second portion 613. The second portion 613 and the fourth portion 615 are bent toward opposite directions relative to the third portion 614. The third portion 614 and the end portion 616 are bent toward the same side relative to the fourth portion 615. The end portion 616 is connected to the adapter 431 and has the first solder mark 621.

[0315] It should be noted that when the first set of tabs 61 includes a root 611, a first part 612, a second part 613, a third part 614, a fourth part 615, and an end 616 connected in sequence, the end of the root 611 of the first set of tabs 61 away from the first part 612 is connected to the cell body 421, and the end 616 of the first set of tabs 61 is connected to the first electrical connection part 4311. When the second set of tabs 62 includes a root 611, a first part 612, a second part 613, a third part 614, a fourth part 615, and an end 616 connected in sequence, the end of the root 611 of the second set of tabs 62 away from the first part 612 is connected to the cell body 421, and the end 616 of the second set of tabs 62 is connected to the third electrical connection part 4313.

[0316] Optionally, the second solder mark 401 is located at the end 616, that is, the end 616 of the first set of tabs 61 has the second solder mark 401 between it and the first electrical connection portion 4311, and the end 616 of the second set of tabs 62 has the second solder mark 401 between it and the third electrical connection portion 4313.

[0317] In this embodiment, by designing the structure and bending shape of the first set of tabs 61 and the second set of tabs 62 after the single cell 400 is assembled, the first set of tabs 61 and the second set of tabs 62 can be bent in an orderly manner within the single cell 400, thereby better reducing the internal resistance of the single cell 400 and improving the energy efficiency and service life of the single cell 400. In addition, the first solder mark 621 is located at the end 616 of the first set of tabs 61 or the second set of tabs 62. This allows the first solder mark 621 to avoid the bending area or bending position of the first set of tabs 61 and the second set of tabs 62, which is beneficial for bending the first set of tabs 61 and the second set of tabs 62 during the assembly of the single cell 400. It avoids bending the first set of tabs 61 and the second set of tabs 62 in the area of ​​the first solder mark 621, reducing the difficulty of bending the first set of tabs 61 and the second set of tabs 62.

[0318] Please see Figure 14 , Figure 32 and Figure 35 In some embodiments, the end cap assembly 430 further includes a top cap 432, a lower plastic 433, and a terminal post 434. The lower plastic 433 is disposed between the top cap 432 and the adapter 431. A portion of the terminal post 434 is located between the lower plastic 433 and the adapter 431 and is electrically connected to the adapter 431. Another portion of the terminal post 434 passes through the lower plastic 433 and the top cap 432 in sequence.

[0319] Please see Figure 34The adapter 431 includes a first electrical connection portion 4311, a second electrical connection portion 4312, and a third electrical connection portion 4313 that are bent and connected in sequence. The first electrical connection portion 4311 and the third electrical connection portion 4313 are bent relative to the second electrical connection portion 4312 in a direction closer to the battery cell body 421. The angle α between the first electrical connection portion 4311 and the second electrical connection portion 4312 is in the range of 80°≤α≤100°.

[0320] Optionally, the angle β between the third electrical connection portion 4313 and the second electrical connection portion 4312 is in the range of 80°≤β≤100°.

[0321] Specifically, the angle α between the first electrical connection portion 4311 and the second electrical connection portion 4312 can be, but is not limited to, 80°, 83°, 85°, 88°, 90°, 92°, 95°, 98°, 100°, etc. If the angle α between the first electrical connection portion 4311 and the second electrical connection portion 4312 is too small or too large, it is not conducive to the assembly of the first set of electrode tabs 61, nor is it conducive to the welding of the first set of electrode tabs 61 and the adapter 431.

[0322] Specifically, the angle β between the third electrical connection 4313 and the second electrical connection 4312 can be, but is not limited to, 80°, 83°, 85°, 88°, 90°, 92°, 95°, 98°, 100°, etc. If the angle β between the third electrical connection 4313 and the second electrical connection 4312 is too small or too large, it will be detrimental to the assembly of the second set of electrodes 62 and the welding of the second set of electrodes 62 to the adapter 431.

[0323] Please see again Figure 15 , Figure 16 , Figure 31 and Figure 32 In some embodiments, the single battery cell 400 further includes a restraint member 500, which is located between the cell body 421 and the adapter 431. The restraint member 500 has a first through groove 521a and a second through groove 521b spaced apart. The first through groove 521a is used to pass through the first set of tabs 61, and the second through groove 521b is used to pass through the second set of tabs 62.

[0324] Optionally, the first through groove 521a and the second through groove 521b are arranged along the arrangement direction of the first electrical connection portion 4311 and the third electrical connection portion 4313. That is, the first through groove 521a and the second through groove 521b are arranged along a third direction.

[0325] It should be noted that the first set of electrode tabs 61 passes through the first through groove 521a and is electrically connected to the first electrical connection part 4311 of the adapter 431, and the second set of electrode tabs 62 passes through the second through groove 521b and is electrically connected to the third electrical connection part 4313 of the adapter 431.

[0326] In some embodiments, the adapter 431 is located between the first through groove 521a and the second through groove 521b, that is, the first electrical connection portion 4311, the second electrical connection portion 4312, and the third electrical connection portion 4313 are all located between the first through groove 521a and the second through groove 521b. In other embodiments, the first electrical connection portion 4311 is located on the side of the first through groove 521a opposite to the third electrical connection portion 4313, and the third electrical connection portion 4313 is located on the side of the second through groove 521b opposite to the first electrical connection portion 4311.

[0327] For a detailed description of other aspects of the restraint member 500, please refer to the description of the corresponding part of the above embodiment, which will not be repeated here.

[0328] In this embodiment, a restraint member 500 is provided between the cell body 421 and the adapter 431. The restraint member 500 has a first through groove 521a and a second through groove 521b that are spaced apart. The first through groove 521a is used to pass through the first set of electrode tabs 61, and the second through groove 521b is used to pass through the second set of electrode tabs 62. By setting the restraint member 500, one end of the battery cell 420 can be clamped, limiting the relative position of the battery cell 420 and the casing 410. This prevents the battery cell 420 from shaking relative to the casing 410 during use and transportation, thus improving the structural stability and electrical connection stability of the battery cell 400. Furthermore, the restraint member 500 allows the first set of tabs 61 and the second set of tabs 62 to pass through and extend to the side of the restraint member 500 away from the battery cell body 421, thereby restraining the first set of tabs 61 and the second set of tabs 62 and preventing them from becoming scattered or misaligned, which would affect the stability of the connection between the first set of tabs 61 and the second set of tabs 62 and the adapter 431. Moreover, the restraint member 500 can... The tabs 61 and 62, the adapter 431 are isolated from the housing 410 to prevent them from touching the housing 410 and causing a short circuit when the first and second tabs 61 and 62 are shaken. This also prevents a short circuit caused by the first and second tabs 61 and 62 being inserted upside down into the cell body 421 when they are long. Furthermore, the restraint 500 prevents direct contact and short circuit between the cell body 421 and the end cap assembly 430. Additionally, the separator 4212 of the cell body 421 is usually designed to be relatively long for safety. A clearance space can be provided on the side of the restraint 500 facing the cell body 421 to accommodate the extra separator 4212, preventing it from being squeezed by the restraint 500, reducing the possibility of damage to the separator 4212, and reducing the risk of material falling out of the cell body 421. Moreover, during electrolyte filling (i.e., electrolyte injection) of the single cell 400, the restraint 500 can also prevent the electrolyte from impacting the cell body 421.

[0329] Please see again Figure 15 and Figure 16In some embodiments, the restraint member 500 includes a side plate 510, a bottom plate 520, a first guide plate 530a, and a second guide plate 530b. The side plate 510 is disposed around the outer periphery of the bottom plate 520, and the bottom plate 520 and the side plate 510 define a mounting groove 501. The mounting groove 501 is opposite to the cell body 421. The bottom plate 520 has a first through groove 521a and a second through groove 521b, both of which communicate with the mounting groove 501. The first guide plate 530a and the second guide plate 530b protrude from the surface of the bottom plate 520 facing the mounting groove 501. The first guide plate 530a is disposed around the outer periphery of the first through groove 521a, and the second guide plate 530b is disposed around the outer periphery of the second through groove 521b. The first guide plate 530a is used to guide the first set of tabs 61, and the second guide plate 530b is used to guide the second set of tabs 62.

[0330] For a detailed description of other aspects of the restraint member 500, please refer to the description of the corresponding part of the above embodiment, which will not be repeated here.

[0331] In this application, the restraint member 500 has a first guide plate 530a disposed on the outer periphery of the first through groove 521a, and a second guide plate 530b protruding from the outer periphery of the second through groove 521b. The first guide plate 530a can guide and support the first set of electrode tabs 61 passing through the first through groove 521a, so that after the single cell 400 is assembled, the first set of electrode tabs 61 can be bent in an orderly manner within the single cell 400, reducing the internal resistance of the single cell 400, improving the service life of the single cell 400, and also better preventing the first set of electrode tabs 61 from bending. 1. By inverting the cell body 421, the probability of short circuit in the single cell 400 is reduced. Similarly, the second guide plate 530b can guide and support the second set of tabs 62 passing through the second through groove 521b, so that after the single cell 400 is assembled, the second set of tabs 62 can be bent in an orderly manner within the single cell 400, reducing the internal resistance of the single cell 400 and improving the service life of the single cell 400. In addition, it can better prevent the second set of tabs 62 from being inverted into the cell body 421, reducing the probability of short circuit in the single cell 400.

[0332] Please see also Figure 15 and Figure 36In some embodiments, the adapter 431 is located between the first guide plate 530a and the second guide plate 530b. The first guide plate 530a forms a first through groove 531a, which connects to the first through groove 521a and the mounting groove 501. The second guide plate 530b forms a second through groove 531b, which connects to the second through groove 521b and the mounting groove 501. The first set of electrode tabs 61 The first set of electrode tabs 61 are sequentially inserted into the first through groove 521a and the first through groove 531a, and extend into the mounting groove 501; the first set of electrode tabs 61 are disposed close to the side wall of the first through groove 531a near the second through groove 531b; the second set of electrode tabs 62 are sequentially inserted into the second through groove 521b and the second through groove 531b, and extend into the mounting groove 501; the second set of electrode tabs 62 are disposed close to the side wall of the second through groove 531b near the first through groove 531a.

[0333] Understandably, the first guide plate 530a has a ring structure and the second guide plate 530b has a ring structure.

[0334] In this embodiment, the first set of tabs 61 are disposed close to the side wall of the first through groove 531a near the second through groove 531b. This allows the first guide plate 530a to better support and guide the first set of tabs 61 during the assembly of the single cell 400, enabling the first set of tabs 61 to bend more orderly. Similarly, the second set of tabs 62 are disposed close to the side wall of the second through groove 531b near the first through groove 531a. This allows the second guide plate 530b to better support and guide the second set of tabs 62 during the assembly of the single cell 400, enabling the second set of tabs 62 to bend more orderly. As a result, the internal resistance of the single cell 400 can be reduced, the service life of the single cell 400 can be improved, and the reverse insertion of the first set of tabs 61 and the second set of tabs 62 into the cell body 421 can be better prevented.

[0335] Please see Figure 36 In some embodiments, the first guide plate 530a has a first arc-shaped transition surface 532a at one end away from the base plate 520, and the second guide portion has a second arc-shaped transition surface 532b at one end away from the base plate 520.

[0336] Understandably, the first guide plate 530a has an arc-shaped chamfer at the end opposite to the base plate 520, and the second guide portion has an arc-shaped chamfer at the end opposite to the base plate 520.

[0337] In this embodiment, the first guide plate 530a has a first arc-shaped transition surface 532a at the end opposite to the base plate 520. This better prevents sharp burrs on the first guide plate 530a from scratching the first set of electrode tabs 61 during the process of the first set of electrode tabs 61 passing through the first guide plate 530a and during assembly processes such as bending the first set of electrode tabs 61. Similarly, the second guide plate 530b has a second arc-shaped transition surface 532b at the end opposite to the base plate 520. This better prevents sharp burrs on the second guide plate 530b from scratching the second set of electrode tabs 62 during the process of the second set of electrode tabs 62 passing through the second guide plate 530b and during assembly processes such as bending the second set of electrode tabs 62.

[0338] Please see Figure 19 and Figure 20 In some embodiments, the tab 60 includes a first tab 60a and a second tab 60b, the first tab 60a and the second tab 60b being located on opposite sides of the cell body 421; at least one of the first tab 60a and the second tab 60b includes a first set of tabs 61 and a second set of tabs 62. The end cap assembly 430 includes a first end cap assembly 430a and a second end cap assembly 430b. The first end cap assembly 430a is located on the side of the cell body 421 where the first tab 60a is located, and the adapter 431 of the first end cap assembly 430a is electrically connected to the first tab 60a. The second end cap assembly 430b is located on the side of the cell 420 where the second tab 60b is located, and the adapter 431 of the second end cap assembly 430b is electrically connected to the second tab 60b. The single cell 400 also includes the restraining member 500, which is located between at least one of the first end cap assembly 430a and the second end cap assembly 430b and the cell body 421. When the single cell 400 includes a restraint member 500, the restraint member 500 is disposed between the first end cap assembly 430a and the cell body 421, and the length of the first tab 60a is greater than the length of the second tab 60b. When the single cell 400 includes two binding members 500, one of the two binding members 500 is disposed between the first end cap assembly 430a and the cell body 421, and the other of the two binding members 500 is disposed between the second end cap assembly 430b and the cell body 421, and the length of the first tab 60a is equal to the length of the second tab 60b.

[0339] Understandably, the first tab 60a and the second tab 60b are located on opposite sides of the cell body 421 along the first direction, the first end cap assembly 430a is disposed on the side of the first tab 60a away from the second tab 60b, and the second end cap assembly 430b is disposed on the side of the second tab 60b away from the first tab 60a.

[0340] In this embodiment, when a restraint member 500 is provided in the single battery cell 400, it can effectively restrict the position of the cell 420 and the casing 410, preventing the cell 420 from rotating during use or transportation, thus improving the structural stability and electrical connection stability of the single battery cell 400. Furthermore, compared to a scheme where restraint members 500 are provided at both ends of the cell body 421, providing a restraint member 500 at only one end of the cell body 421 can better reduce the volume of the single battery cell 400 and increase its volumetric energy density. In addition, the length of the first tab 60a is greater than the length of the second tab 60b. The longer length of the first tab 60a facilitates its insertion through the through slot 521 of the restraint member 500 and subsequent electrical connection with the adapter 431. The shorter length of the second tab 60b helps to shorten the current path, reduce the internal resistance of the single battery cell 400, and improve its energy efficiency. When the single battery cell 400 is equipped with two restraining members 500, it not only better restricts the position of the cell 420 and the casing 410, preventing the cell 420 from rotating during use or transportation, thus improving the structural stability and electrical connection stability of the single battery cell 400, but also provides better insulation between the first tab 60a and the second tab 60b, preventing reverse insertion and short circuits, thereby improving the safety of the single battery cell 400. Furthermore, since the length of the first tab 60a is equal to the length of the second tab 60b, the current paths at both ends of the single battery cell 400 are equal, further improving the consistency of the single battery cell 400.

[0341] In related technologies, a restraining component is placed between the cell and the end cap assembly of a single battery cell to limit the cell body from the casing and to insulate the cell body from the end cap assembly. However, the design of this restraining component in these technologies hinders the orderly folding of the tabs and increases the internal resistance of the single battery cell.

[0342] Please see Figure 4 , Figure 5 , Figure 17 and Figure 37This application provides a single-cell battery 400, which includes: a housing 410, a cell 420, a restraining member 500, and an end cap assembly 430; the housing 410 has a receiving cavity 411; the cell 420 is disposed in the receiving cavity 411, and the cell 420 includes a cell body 421 electrically connected to a tab 60, the cell body 421 and the tab 60 being arranged along a first direction; the restraining member 500 is located on the side of the cell body 421 with the tab 60, and the restraining member 500 includes a side plate 510, a bottom plate 520, and a guide plate 530, the side plate 510 being disposed around the outer periphery of the bottom plate 520, and the bottom plate 520 and the side plate 510 defining a mounting groove 501. The mounting groove 501 is opposite to the cell body 421. The base plate 520 has a through groove 521 that communicates with the mounting groove 501. The guide plate 530 protrudes from the surface of the base plate 520 facing the mounting groove 501 and surrounds the outer periphery of the through groove 521. The electrode tab 60 passes through the through groove 521 and is partially located within the mounting groove 501. The end cap assembly 430 is located on the side of the restraint member 500 opposite to the cell body 421. The end cap assembly 430 includes an adapter 431 located in the mounting groove 501 and connected (e.g., welded) to the end of the electrode tab 60 opposite to the cell body 421. The electrode tab 60 passes through the through slot 521 with a dimension of w1, and the guide plate 530 is along a first direction (e.g., Figure 17 The dimension of the double arrow X is w2. The distance from the connection point (such as the welding point) between the adapter 431 and the tab 60 closest to the cell body 421 to the end face of the tab 60 away from the cell body 421 is w3. Then 2≤(w1-w3) / w2≤8.

[0343] For further detailed descriptions of other aspects of the single battery cell 400, the cell 420, the restraint member 500, and the end cap assembly 430, please refer to the descriptions of the corresponding sections of the above embodiments.

[0344] Specifically, (w1-w3) / w2 can be, but is not limited to, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, etc.

[0345] The single-cell battery 400 of this application includes a housing 410, a cell 420, a restraint member 500, and an end cap assembly 430. By designing the relationship between the dimension w1 of the tab 60 passing through the through groove 521, the dimension w2 of the guide plate 530 along the first direction, and the distance w3 from the connection point of the adapter 431 and the tab 60 closest to the cell body 421 to the end face of the tab 60 away from the cell body 421, the internal resistance of the single-cell battery 400 can be effectively reduced and the assembly efficiency of the single-cell battery 400 can be improved.

[0346] In this embodiment, if (w1-w3) / w2 is too small, then the dimension w1 of the tab 60 passing through the through slot 521 is too small, or the dimension w2 of the guide plate 530 along the first direction is too large, or the distance w3 from the connection point of the adapter 431 and the tab 60 closest to the cell body 421 to the end face of the tab 60 away from the cell body 421 is too large; if w1 is too small, it means that the length of the tab 60 is too short, the tab 60 cannot be bent in an orderly manner, or even is difficult to bend, affecting the shell 410 and the end cap assembly. Welding of the top cover 432 of component 430; if w2 is too large, the guide plate 530 will protrude too much from the bottom plate 520, which will require the side plate 510 to be made larger along the first direction, increasing the size of the single cell 400 and reducing the energy density of the single cell 400. In addition, if w2 is too large, the tab 60 will need to be made longer (i.e., w1 needs to be larger) so that the tab 60 can be bent in an orderly manner within the restraint member 500, which increases the internal resistance of the single cell 400 and reduces the energy efficiency and service life of the single cell 400. If w3 is too large, the connection point (i.e., welding point) between the tab 60 and the adapter 431 will be too close to the end of the tab 60 connected to the cell body 421, thus preventing the tab 60 from bending sufficiently and causing the end cap assembly 430 to be embedded too little into the receiving cavity 411 of the housing 410 (i.e., the end cap assembly 430 cannot be pressed sufficiently against the housing 410), resulting in insufficient utilization of the housing 410 along the first direction and reducing the energy density of the single cell 400. In addition, if w3 is too large, it is also easy for the end of the tab 60 away from the cell body 421 to be too close to the lower plastic 433, causing interference between the tab 60 and the lower plastic 433, resulting in a gap between the welding part of the tab 60 and the adapter 431, leading to poor welding when welding the tab 60 and the adapter 431 or the welding heat of the tab 60 and the adapter 431 affecting the structural stability of the lower plastic 433.

[0347] In this embodiment, if (w1-w3) / w2 is too large, then w1 is too large, or w2 is too small, or w3 is too small. If w1 is too large, the tab 60 is prone to disordered bending, increasing the internal resistance of the single cell 400 and reducing the energy efficiency and lifespan of the single cell 400. In addition, if w1 is too large, when the tab 60 is welded to the adapter 431, the tab 60 is prone to contacting the lower plastic 433, thereby causing the heat generated during the welding of the tab 60 and the adapter 431 to be transferred to the lower plastic 433 through the tab 60, resulting in the lower plastic 433 melting or deforming. Furthermore, when the tab 60 is welded to the adapter 431, if the tab 60... If the tab 60 is too long and presses against the lower plastic 433, the reaction force exerted by the lower plastic 433 on the tab 60 will easily cause poor welding between the tab 60 and the adapter 431, resulting in a weak weld. During the assembly of the end cap assembly 430, if the tab 60 is too long and there is no gap between the tab 60 and the lower plastic 433, the tab 60 will press against the lower plastic 433, and the lower plastic 433 will exert a certain amount of compressive force on the tab 60. This can easily cause the weak point in the weld between the tab 60 and the adapter 431 to break under this pressure. If w2 is too small, it reduces the support and guidance effect of the guide plate 530 on the tab 60, which is not conducive to the orderly bending of the tab 60, making it prone to disorderly bending, increasing the internal resistance of the single cell 400, and reducing the energy efficiency and lifespan of the single cell 400. If w3 is too small, the area where the tab 60 connects to the adapter 431 will be too small, reducing the stability of the connection between the tab 60 and the adapter 431. In addition, it makes the tab 60 and the adapter 431 prone to poor soldering, reducing the yield of the single cell 400 assembly.

[0348] Please see Figure 15 and Figure 16In some embodiments, the through slot 521 includes a first through slot 521a and a second through slot 521b, both extending along a second direction and spaced apart along a third direction. The guide plate 530 includes a first guide plate 530a and a second guide plate 530b, the first guide plate 530a surrounding the outer periphery of the first through slot 521a and the second guide plate 530b surrounding the outer periphery of the second through slot 521b. The plurality of tabs 60 includes a first group of tabs 61 and a second group of tabs 62, the first group of tabs 61 and the second group of tabs 62 being spaced apart on the same side of the cell body 421. The electrode tab 61 includes a plurality of electrode tabs 60 stacked together, and the second set of electrode tabs 62 includes a plurality of electrode tabs 60 stacked together; the first set of electrode tabs 61 passes through the first through groove 521a, and the second set of electrode tabs 62 passes through the second through groove 521b; the adapter 431 includes a first electrical connection portion 4311, a second electrical connection portion 4312, and a third electrical connection portion 4313 that are bent and connected in sequence, the first electrical connection portion 4311 and the third electrical connection portion 4313 being bent relative to the second electrical connection portion 4312 toward the direction closer to the battery cell body 421; the first electrical connection portion 4311 is electrically connected to the first set of electrode tabs 61, and the third electrical connection portion 4313 is electrically connected to the second set of electrode tabs 62.

[0349] In one example, the adapter 431 is located between the first guide plate 530a and the second guide plate 530b, that is, the first electrical connection portion 4311, the second electrical connection portion 4312, and the third electrical connection portion 4313 are all located between the first guide plate 530a and the second guide plate 530b. In another example, the first electrical connection portion 4311 is located on the side of the first guide plate 530a opposite to the second guide plate 530b and is spaced apart from the first guide plate 530a; the third electrical connection portion 4313 is located on the side of the second guide plate 530b opposite to the first guide plate 530a and is spaced apart from the second guide plate 530b.

[0350] In this embodiment, after multiple earphones are divided into two groups and passed through the first through slot 521a and the second through slot 521b respectively, and then electrically connected to the same adapter 431, the length of the multiple earpieces 60 can be shortened, the current path between the adapter 431 and the two groups of earpieces 60 is shorter, the energy efficiency is higher, and the utilization rate of the earpieces 60 is improved. In addition, the adapter 431 includes a first electrical connection part 4311, a second electrical connection part 4312, and a third electrical connection part 4313 that are bent and connected in sequence. The first electrical connection part 4311 and the third electrical connection part 4313 are respectively positioned relative to the second electrical connection part 4312 towards... The electrode bends towards the cell body 421; the first electrical connection 4311 is electrically connected to the first set of tabs 61, and the third electrical connection 4313 is electrically connected to the second set of tabs 62. Thus, when the adapter 431 is welded to the first set of tabs 61 and the second set of tabs 62, and the end cap assembly 430 is pressed against the housing 410, it is beneficial for the first set of tabs 61 and the second set of tabs 62 to bend in an orderly manner under the cooperation of the guide plate 530 and the adapter 431, thereby better reducing the internal resistance of the single cell 400, accelerating the current transmission efficiency of the single cell 400, and improving the energy efficiency of the single cell 400.

[0351] Optionally, there may be multiple tabs 60, including a first group of tabs 61 and a second group of tabs 62. The first group of tabs 61 has a second solder mark 401 with the adapter 431. The end of the second group of tabs 62 facing away from the cell body 421 is electrically connected to the other end of the adapter 431, and the second group of tabs 62 has a second solder mark 401 with the adapter 431. Understandably, the connection point between the adapter 431 and the tab 60 closest to the cell body 421 is the point of the second solder mark 401 closest to the cell body 421, and w3 is the distance from the point of the second solder mark 401 closest to the cell body 421 to the end face of the first group of tabs 61 or the second group of tabs 62 facing away from the cell body 421.

[0352] Optionally, at least one of the first set of electrode tabs 61 and the second set of electrode tabs 62 includes a root portion 611, a first portion 612, a second portion 613, a third portion 614, a fourth portion 615, and an end portion 616 connected in sequence. The end of the root portion 611 facing away from the first portion 612 is connected to the cell body 421. The first portion 612 passes through the through groove 521. The first portion 612, the second portion 613, the third portion 614, the fourth portion 615, and the end portion 616 are bent and connected in sequence. The first portion 612 and the third portion 614 are respectively compared with The second part 613 is bent toward the same side, the second part 613 and the fourth part 615 are bent in opposite directions relative to the third part 614, the third part 614 and the end part 616 are bent toward the same side relative to the fourth part 615, and the end part 616 is connected to the adapter 431; w1 is the sum of the dimensions of the first part 612, the second part 613, the third part 614, the fourth part 615 and the end part 616 along the arrangement or extension direction of the first part 612, the second part 613, the third part 614, the fourth part 615 and the end part 616.

[0353] Please see Figure 14 and Figure 17 In some embodiments, along the first direction, the end face of the guide plate 530 facing away from the base plate 520 is lower than the opening of the mounting groove 501.

[0354] In this embodiment, by ensuring that the end face of the guide plate 530 facing away from the base plate 520 is lower than the opening of the mounting groove 501, when the restraint member 500 is installed on the single cell 400, it can better prevent the tab 60 from abutting against the lower plastic 433 of the end cap assembly 430, thus preventing interference with the end cap assembly 430 and affecting its installation. Furthermore, the side plate 510 can better isolate the tab 60, better preventing it from contacting the housing 410 and causing a short circuit in the single cell 400.

[0355] Please see Figure 9 In some embodiments, the through groove 521 extends along the second direction and upward along the third direction, and the distance s1 between the guide plate 530 and the side plate 510 is in the range of 3mm≤s1≤13mm, wherein the first direction, the second direction and the third direction intersect each other.

[0356] Specifically, along the third direction upward, the distance s1 between the guide plate 530 and the side plate 510 can be, but is not limited to, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, etc.

[0357] In this embodiment, if the distance s1 between the guide plate 530 and the side plate 510 along the third direction is too small, the tab 60 passing through the through groove 521 includes multiple tabs 60 stacked along the third direction. Each tab 60 is electrically connected to a different position of the battery cell body 421. Therefore, the distance between each tab 60 and the guide plate 530 is different. The closer the tab 60 is to the through groove 521 along the third direction, the larger the size of the tab 60 after it extends out of the guide plate 530. The farther the tab 60 is from the through groove 521 along the third direction, the smaller the size of the tab 60 after it extends out of the guide plate 530. If s1 is too small, the tab 60 near the middle of the restraint member 500 along the third direction will have too small a size extending out of the guide plate 530, and the area or region to be welded to the adapter 431 will be too small, reducing the welding strength between the tab 60 and the adapter 431, or even making it impossible to weld to the adapter 431. If the distance s1 between the guide plate 530 and the side plate 510 along the third direction is too large, the guide plate 530 and the through groove 521 will be too close to the middle position of the restraint member 500 along the third direction, which will make the size of the adapter 431 along the third direction too small, reducing the welding area of ​​the adapter 431 and the pole post 434 of the end cap assembly 430, and affecting the welding of the adapter 431 and the pole post 434 of the end cap assembly 430.

[0358] Please see Figure 9 In some embodiments, the dimension of the restraint member 500 along a third direction is s2, then s1≤1 / 4×s2.

[0359] Understandably, along the third direction upward, the distance s1 between the guide plate 530 and the side plate 510 is less than or equal to 1 / 4 of the width of the restraint member 500.

[0360] Specifically, s1 can be, but is not limited to, 0.15s2, 0.16s2, 0.17s2, 0.18s2, 0.19s2, 0.2s2, 0.21s2, 0.22s2, 0.23s2, 0.24s2, 0.25s2, etc.

[0361] In this embodiment, if the distance s1 between the guide plate 530 and the side plate 510 along the third direction is too large, the guide plate 530 and the through groove 521 will be too close to the middle position of the restraint member 500 along the third direction, which will make the size of the adapter 431 along the third direction too small, reducing the welding area of ​​the adapter 431 and the pole post 434 of the end cap assembly 430, and affecting the welding of the adapter 431 and the pole post 434 of the end cap assembly 430.

[0362] Please see Figure 15 and Figure 36In some embodiments, the through groove 521 extends along a second direction, and the dimension of the through groove 521 along the second direction is greater than the dimension of the electrode tab 60 along the second direction; the guide plate 530 surrounds the through groove 531, and the dimension of the through groove 531 along the second direction is greater than the dimension of the electrode tab 60 along the second direction, wherein the first direction intersects the second direction.

[0363] Understandably, when the through groove 521 includes a first through groove 521a and a second through groove 521b, and the guide plate 530 includes a first guide plate 530a and a second guide plate 530b, the through groove 531 includes a first through groove 531a and a second through groove 531b. The first guide plate 530a forms the first through groove 531a, and the second guide plate 530b forms the second through groove 531b. The electrode tab 60 includes a first set of electrode tabs 61 and a second set of electrode tabs 62. The first set of electrode tabs 61 are sequentially inserted into the first through groove 521a and the first through groove 531a, and the second set of electrode tabs 62 are sequentially inserted into the second through groove 521b and the second through groove 531b.

[0364] Furthermore, if the ratio of the dimension of the through groove 521 along the second direction to the dimension of the electrode 60 along the second direction is A1, then A1≥1.1; and if the ratio of the dimension of the through groove 531 along the second direction to the dimension of the electrode 60 along the second direction is A2, then A2≥1.1.

[0365] Specifically, A1 can be, but is not limited to, 1.1, 1.13, 1.15, 1.18, 1.2, 1.23, 1.25, 1.28, 1.3, etc.

[0366] Specifically, A2 can be, but is not limited to, 1.1, 1.13, 1.15, 1.18, 1.2, 1.23, 1.25, 1.28, 1.3, etc.

[0367] In this embodiment, the dimension of the through groove 521 along the second direction is larger than the dimension of the tab 60 along the second direction, and the dimension of the through groove 531 along the second direction is larger than the dimension of the tab 60 along the second direction. This ensures that during assembly, the tab 60 has a gap with the inner walls of the through groove 521 and the through groove 531, which can better prevent interference between the tab 60 and the inner walls of the through groove 521 and the through groove 531. This facilitates the tab 60 to pass through the through groove 521 and the through groove 531 quickly, and can better improve the efficiency of the tab 60 passing through the restraint member 500, thereby increasing the assembly rate of the single cell 400.

[0368] Please see again Figure 9In some embodiments, the through groove 521 extends along the second direction, and the dimension s3 of the through groove 521 along the third direction is in the range of 1mm≤s3≤10mm; the dimension s4 of the through groove 531 along the third direction is in the range of 1mm≤s4≤10mm, wherein the first direction, the second direction and the third direction intersect each other.

[0369] Specifically, the dimension s3 of the through groove 521 along the third direction can be, but is not limited to, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc. If the dimension s3 of the through groove 521 along the third direction is too small, it increases the difficulty of assembling the electrode tab 60; if the dimension s3 of the through groove 521 along the third direction is too large, it makes the through groove 531 larger, reducing the guiding and binding effect of the guide plate 530 on the electrode tab 60, which is not conducive to the orderly bending of the electrode tab 60.

[0370] Specifically, the dimension s4 of the through-groove 531 along the third direction can be, but is not limited to, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc. If the dimension s4 of the through-groove 531 along the third direction is too small, it increases the difficulty of assembling the electrode tab 60; if the dimension s4 of the through-groove 531 along the third direction is too large, it reduces the guiding and binding effect of the guide plate 530 on the electrode tab 60, which is not conducive to the orderly bending of the electrode tab 60.

[0371] Please see Figure 7 , Figure 9 , Figure 11 and Figure 16 In some embodiments, the through slot 521 extends along a second direction, the base plate 520 has at least two through slots 521, the number of guide plates 530 is at least two, one guide plate 530 is arranged around the outer periphery of one through slot 521, and different guide plates 530 are arranged around different through slots 521; the at least two guide plates 530 are arranged symmetrically along an axis parallel to the second direction, the adapter 431 is located between two adjacent guide plates 530 along a third direction, the distance between two adjacent guide plates 530 along a third direction is greater than the size of the adapter 431 along a third direction, wherein the first direction, the second direction and the third direction intersect each other.

[0372] Understandably, the restraint member 500 has a first through groove 521a and a second through groove 521b spaced apart along a third direction. The guide plate 530 includes a first guide plate 530a and a second guide plate 530b. The first guide plate 530a is disposed around the outer periphery of the first through groove 521a, and the second guide plate 530b is disposed along the outer periphery of the second through groove 521b. The plurality of tabs 60 includes a first set of tabs 61 and a second set of tabs 62. The first set of tabs 61 and the second set of tabs 62 are spaced apart on the same side of the cell body 421. The first set of tabs 61 passes through the first through groove 521a, and the second set of tabs 62 passes through the second through groove 521b. The adapter 431 is located between the first guide plate 530a and the second guide plate 530b and is electrically connected to the first set of tabs 61 and the second set of tabs 62, respectively.

[0373] Understandably, the first guide plate 530 and the second guide plate 530b are spaced apart along a third direction.

[0374] Understandably, the adapter 431 is spaced apart from the two adjacent guide plates 530 along the third direction upward. That is, the adapter 431 is spaced apart from the first guide plate 530a, and the adapter 431 is also spaced apart from the second guide plate 530b.

[0375] In this embodiment, the adapter 431 is located between two adjacent guide plates 530 along the third direction, and the distance between the two adjacent guide plates 530 along the third direction is greater than the size of the adapter 431 along the third direction. This provides sufficient space between the two adjacent guide plates 530 to accommodate the adapter 431 and allow the tab 60 to be bent.

[0376] Please see Figure 8 In some embodiments, the side plate 510 includes a plurality of first through holes 511 spaced apart, and the bottom plate 520 includes a plurality of second through holes 526 spaced apart.

[0377] For a detailed description of the first through hole 511, the second through hole 526, etc., please refer to the description of the corresponding part of the above embodiment, which will not be repeated here.

[0378] In this embodiment, a first through hole 511 is provided in the side plate 510, and a second through hole 526 is provided in the bottom plate 520. This allows the electrolyte to reach the cell 420 more quickly through the restraint member 500 during electrolyte injection into the single cell 400, improving the efficiency of electrolyte injection into the single cell 400. Furthermore, the first through hole 511 and the second through hole 526 can serve as venting channels in the event of thermal runaway in the single cell 400, increasing the permeability and venting effectiveness within the single cell 400, improving the venting rate of the single cell 400, and better preventing safety accidents such as explosions caused by trapped gas during thermal runaway, thus improving the safety of the single cell 400 in use.

[0379] Please see Figure 8 In some embodiments, the first through hole 511 is located near the opening of the mounting groove 501.

[0380] Optionally, such as Figure 23 As shown, the side plate 510 has a first end 512 and a second end 513 disposed opposite to each other along a first direction. The first end 512 is disposed further away from the bottom plate 520 than the second end 513, that is, the first end 512 is further away from the cell body 421 than the second end 513. The first through hole 511 is disposed close to the first end 512. In other words, the first through hole 511 is disposed away from the cell body 421.

[0381] In this embodiment, the first through hole 511 is positioned close to the opening of the mounting groove 501. This allows for a larger area to be reserved on the outer wall of the side plate 510 near the cell body 421 for attaching the first insulating film 460, the second insulating film 470, the first air guide plate 440, and the second air guide plate 450, without blocking the first through hole 511 and affecting the smoothness of venting. This not only better maintains the smooth venting of the single cell 400, but also allows the side plate 510 to have a larger contact area with the first insulating film 460, the second insulating film 470, the first air guide plate 440, and the second air guide plate 450, thereby improving the stability of the connection between the restraint member 500 and the first insulating film 460, the second insulating film 470, the first air guide plate 440, and the second air guide plate 450.

[0382] Please see Figure 9 and Figure 23 In some embodiments, the orthographic projection of the guide plate 530 onto the surface of the side plate 510 facing the mounting groove 501 is offset from the first through hole 511.

[0383] The through groove 521 extends along the second direction, and the guide plate 530 is arranged around the outer periphery of the through groove 521. Therefore, the guide plate 530 also extends along the second direction. If the orthographic projection of the guide plate 530 on the surface of the side plate 510 facing the mounting groove 501 overlaps with the first through hole 511, the guide plate 530 is likely to block the first through hole 511 of the restraint member 500 arranged along the second direction, thereby blocking the exhaust path and hindering the exhaust of the single cell 400 in the event of thermal runaway. In this embodiment, by making the orthographic projection of the guide plate 530 on the surface of the side plate 510 facing the mounting groove 501 staggered from the first through hole 511, when the single cell 400 experiences thermal runaway, the guide plate 530 will not block the exhaust path of the first through hole 511 in either the second or third direction, which is beneficial to improving the safety of the single cell 400.

[0384] Please see Figure 29 In some embodiments, the tab 60 includes a first tab 60a and a second tab 60b, the first tab 60a and the second tab 60b being located on opposite sides of the cell body 421 along a first direction and respectively connected to the cell body 421; the end cap assembly 430 includes a first end cap assembly 430a and a second end cap assembly 430b, the first end cap assembly 430a being located on the side of the cell body 421 having the first tab 60a, and an adapter 431 of the first end cap assembly 430a being electrically connected to the first tab 60a; the second end cap assembly 430b being located on the side of the cell 420 having the second tab 60b, and an adapter 431 of the second end cap assembly 430b being electrically connected to the second tab 60b; The first tab 60a is a positive tab 60a1, the second tab 60b is a negative tab 60a2, and the restraint member 500 has two through slots 521 spaced apart along a third direction; the restraint member 500 is disposed between at least one of the first end cap assembly 430a and the second end cap assembly 430b and the cell body 421. When the restraint member 500 is located between the first end cap assembly 430a and the cell body 421, the first electrode tab 60a includes a first set of electrode tabs 61 and a second set of electrode tabs 62. The first set of electrode tabs 61 of the first electrode tab 60a passes through one of the two through slots 521, and the second set of electrode tabs 62 of the first electrode tab 60a passes through the other of the two through slots 521. When the restraint member 500 is located between the second end cap assembly 430b and the cell body 421, the second electrode tab 60b includes a first set of electrode tabs 61 and a second set of electrode tabs 62. The first set of electrode tabs 61 of the second electrode tab 60b passes through one of the two through slots 521, and the second set of electrode tabs 62 of the second electrode tab 60b passes through the other of the two through slots 521, wherein the first direction intersects with the third direction.

[0385] For detailed descriptions of the first tab 60a, the second tab 60b, the first end cap assembly 430a, the second end cap assembly 430b, the adapter 431, and other aspects, please refer to the descriptions of the corresponding parts of the above embodiments, which will not be repeated here.

[0386] Please see Figure 24 and Figure 25 In some embodiments, the tab 60 includes a first tab 60a and a second tab 60b, the first tab 60a and the second tab 60b being located on opposite sides of the cell body 421 along a first direction and respectively connected to the cell body 421; the end cap assembly 430 includes a first end cap assembly 430a and a second end cap assembly 430b, the first end cap assembly 430a being located on the side of the cell body 421 having the first tab 60a; the second end cap assembly 430b being located on the side of the cell 420 having the second tab 60b; The first electrode tab 60a includes a plurality of positive electrode tabs 60a1 and a plurality of negative electrode tabs 60a2. The first end cap assembly 430a includes a first positive electrode adapter 431a1 and a first negative electrode adapter 431a2. The first positive electrode adapter 431a1 is electrically connected to the plurality of positive electrode tabs 60a1 of the first electrode tab 60a, and the first negative electrode adapter 431a2 is electrically connected to the plurality of negative electrode tabs 60a2 of the first electrode tab 60a. The second electrode tab 60b includes a plurality of positive electrode tabs 60a1 and a plurality of negative electrode tabs 60a2. The second end cap assembly... Component 430b includes a second positive electrode adapter 431b1 and a second negative electrode adapter 431b2. The second positive electrode adapter 431b1 is electrically connected to the plurality of positive electrodes 60a1 of the second electrode 60b, and the second negative electrode adapter 431b2 is electrically connected to the plurality of negative electrodes 60a2 of the second electrode 60b. The restraining member 500 has four through slots 521 arranged in an array. The restraining member 500 is disposed between at least one of the first end cap assembly 430a and the second end cap assembly 430b and the cell body 421. When the restraint member 500 is located between the first end cap assembly 430a and the cell body 421, a portion of the plurality of positive tabs 60a1 of the first tab 60a is inserted through one of the two through slots 521, and another portion of the plurality of positive tabs 60a1 of the first tab 60a is inserted through the other of the two through slots 521; a portion of the plurality of negative tabs 60a2 of the first tab 60a is inserted through one of the other two through slots 521, and another portion of the plurality of negative tabs 60a2 of the first tab 60a is inserted through the other of the other two through slots 521. When the restraint member 500 is located between the second end cap assembly 430b and the cell body 421, a portion of the plurality of positive tabs 60a1 of the second tab 60b passes through one of the two through slots 521, and another portion of the plurality of positive tabs 60a1 of the second tab 60b passes through the other of the two through slots 521; a portion of the plurality of negative tabs 60a2 of the second tab 60b passes through one of the other two through slots 521, and another portion of the plurality of negative tabs 60a2 of the second tab 60b passes through the other of the other two through slots 521.

[0387] For detailed descriptions of the first tab 60a, the second tab 60b, the positive tab 60a1, the negative tab 60a2, the first end cap assembly 430a, the second end cap assembly 430b, the adapter 431, and other aspects, please refer to the descriptions of the corresponding parts of the above embodiments, which will not be repeated here.

[0388] In this embodiment, the first tab 60a includes a plurality of positive tabs 60a1 and a plurality of negative tabs 60a2, and the first end cap assembly 430a includes a first positive adapter 431a1 and a first negative adapter 431a2. The first positive adapter 431a1 is electrically connected to the plurality of positive tabs 60a1 of the first tab 60a, and the first negative adapter 431a2 is electrically connected to the plurality of negative tabs 60a2 of the first tab 60a. The second tab 60b includes a plurality of positive tabs 60a1 and a plurality of negative tabs 60a2, and the second end cap assembly 430b includes a second positive adapter 431b1 and a second negative adapter 431b2. The second positive adapter 431b1 is electrically connected to the plurality of positive tabs 60a1 of the second tab 60b, and the second negative adapter 431b2 is electrically connected to the plurality of negative tabs 60a2 of the second tab 60b. This allows the first end cap assembly 430a to include a positive terminal and a negative terminal, and the second end cap assembly 430b to also include a positive terminal and a negative terminal. The same positive electrode 4211 can be led out through the two positive terminals at both ends, and the same negative electrode 4213 can be led out through the two negative terminals at both ends. This reduces half of the current path in the single cell 400, greatly reduces the internal resistance of the single cell 400, and improves the energy efficiency of the single cell 400.

[0389] In this application, the terms "embodiment" and "implementation" mean that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of these phrases in various locations throughout the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described in this application can be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the various embodiments of this application can be arbitrarily combined to form yet another embodiment that does not depart from the spirit and scope of the technical solution of this application, provided there is no contradiction between them.

[0390] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A single-cell battery (400), characterized in that, The single cell (400) includes: The housing (410) has a receiving cavity (411). A battery cell (420) is disposed within the receiving cavity (411). The battery cell (420) includes an electrically connected battery cell body (421) and a plurality of tabs (60). The plurality of tabs (60) are disposed on the same side of the battery cell body (421). The battery cell body (421) and the plurality of tabs (60) are arranged along a first direction. The plurality of tabs (60) includes a first set of tabs (61) and a second set of tabs (62). A restraint member (500) is located on the side of the cell body (421) having the tab (60). The restraint member (500) includes a side plate (510) and a bottom plate (520). The side plate (510) is arranged around the outer periphery of the bottom plate (520), and the bottom plate (520) and the side plate (510) define a mounting groove (501). The mounting groove (501) is disposed away from the cell body (421). The bottom plate (520) has a first through groove (521a) and a second through groove. The groove (521b), the first through groove (521a) and the second through groove (521b) both extend along the second direction, the first through groove (521a) and the second through groove (521b) are spaced apart along the third direction and are respectively connected to the mounting groove (501), the first set of electrode tabs (61) passes through the first through groove (521a), and the second set of electrode tabs (62) passes through the second through groove (521b), wherein the first direction, the second direction and the third direction intersect each other; and An end cap assembly (430) is disposed on the side of the restraint member (500) away from the cell body (421). The end cap assembly (430) includes an adapter (431), which is located in the mounting groove (501) and is located between the first through groove (521a) and the second through groove (521b) along the third direction. The two opposite ends of the adapter (431) are electrically connected to the first set of tabs (61) and the second set of tabs (62), respectively.

2. The single-cell battery (400) according to claim 1, characterized in that, The adapter (431) includes a first electrical connection part (4311), a second electrical connection part (4312), and a third electrical connection part (4313) that are bent and connected in sequence. The first electrical connection part (4311) and the third electrical connection part (4313) are bent relative to the second electrical connection part (4312) towards the direction close to the battery cell body (421). The first electrical connection part (4311) is disposed near the first through groove (521a) and is electrically connected to the first set of tabs (61). The third electrical connection part (4313) is disposed near the second through groove (521b) and is electrically connected to the second set of tabs (62).

3. The single-cell battery (400) according to claim 2, characterized in that, The restraint member (500) further includes a first guide plate (530a) and a second guide plate (530b). The first guide plate (530a) and the second guide plate (530b) are spaced apart on the surface of the base plate (520) facing the mounting groove (501). The first guide plate (530a) is arranged around the outer periphery of the first through groove (521a), and the second guide plate (530b) is arranged around the outer periphery of the second through groove (521b). The adapter (431) is located between the first guide plate (530a) and the second guide plate (530b) and is spaced apart from the first guide plate (530a) and the second guide plate (530b) respectively.

4. The single-cell battery (400) according to claim 3, characterized in that, The distance between the first guide plate (530a) and the first electrical connection part (4311) is H1, and the total thickness of the first set of electrode tabs (61) is h1, then H1 > 2h1; The distance between the second guide plate (530b) and the third electrical connection part (4313) is H2, and the total thickness of the first set of tabs (61) is h2, then H2 > 2h2.

5. The single-cell battery (400) according to claim 3, characterized in that, The end face of the first guide plate (530a) facing away from the base plate (520) is lower than the opening of the mounting groove (501), and the end face of the second guide plate (530b) facing away from the base plate (520) is lower than the opening of the mounting groove (501); the end of the side plate (510) facing away from the cell body (421) abuts against the end cap assembly (430).

6. The single-cell battery (400) according to claim 1, characterized in that, The first through groove (521a) has a larger dimension along the second direction than the first set of electrode tabs (61) along the second direction, and the second through groove (521b) has a larger dimension along the second direction than the second set of electrode tabs (62) along the second direction; the first through groove (521a) has a larger dimension along the third direction than the first set of electrode tabs (61) along the third direction, and the second through groove (521b) has a larger dimension along the third direction than the second set of electrode tabs (62) along the third direction; wherein the first direction, the second direction and the third direction intersect each other.

7. The single-cell battery (400) according to claim 6, characterized in that, The first set of electrodes (61) includes multiple electrodes (60) stacked sequentially along a third direction. The multiple electrodes (60) of the first set of electrodes (61) have the same size along the second direction. The size of a single electrode (60) in the first set of electrodes (61) along the second direction is L11. The misalignment of the multiple electrodes (60) in the first set of electrodes (61) is △L11 = (size of the first set of electrodes (61) along the second direction - size of a single electrode (60) along the second direction). The size of the first through groove (521a) along the second direction is L21. Then L21 ≥ L11 + 2 × △L11. And / or, The second set of electrodes (62) includes multiple electrodes (60) stacked sequentially along a third direction. The multiple electrodes (60) of the second set of electrodes (62) have the same size along the second direction. The size of a single electrode (60) in the second set of electrodes (62) along the second direction is L12. The misalignment of the multiple electrodes (60) in the second set of electrodes (62) is △L12 = (size of the second set of electrodes (62) along the second direction - size of a single electrode (60) along the second direction). The size of the second through groove (521b) along the second direction is L22. Then L22 ≥ L12 + 2 × △L12.

8. The single-cell battery (400) according to claim 2, characterized in that, The first electrical connection (4311) is perpendicular to the second electrical connection (4312), and the third electrical connection (4313) is perpendicular to the second electrical connection (4312). And / or, the end of the first set of tabs (61) away from the cell body (421) is connected to the surface of the first electrical connection part (4311) away from the third electrical connection part (4313), and the end of the second set of tabs (62) away from the cell body (421) is connected to the surface of the third electrical connection part (4313) away from the first electrical connection part (4311).

9. The single-cell battery (400) according to claim 1, characterized in that, The end cap assembly (430) further includes a top cap (432), a lower plastic (433), and a pole (434); the lower plastic (433) is disposed between the top cap (432) and the adapter (431); a portion of the pole (434) is located between the adapter (431) and the lower plastic (433) and is electrically connected to the adapter (431), and the other portion of the pole (434) is sequentially inserted through the lower plastic (433) and the top cap (432); there is a gap between the plurality of tabs (60) and the lower plastic (433).

10. The single-cell battery (400) according to claim 2, characterized in that, At least one of the first set of tabs (61) and the second set of tabs (62) includes a root (611), a first part (612), a second part (613), a third part (614), a fourth part (615), and an end (616) connected in sequence. The end of the root (611) opposite to the first part (612) is connected to the cell body (421). The first part (612) passes through the first through groove (521a) or the second through groove (521b). The first part (612), the second part (613), the third part (614), the fourth part (615), and the end (616) are bent and connected in sequence. The first part (612) and the third part (614) are respectively relative to the second part (611). 3) Bending towards the same side, the second part (613) and the fourth part (615) are bent in opposite directions relative to the third part (614), the third part (614) and the end part (616) are bent towards the same side relative to the fourth part (615), and the end part (616) is connected to the first electrical connection part (4311) or the third electrical connection part (4313); the third part (614), the fourth part (615) and the end part (616) are all located between the first through groove (521a) and the first electrical connection part (4311) or the third part (614), the fourth part (615) and the end part (616) are all located between the second through groove (521b) and the third electrical connection part (4313).

11. An energy storage device (200), characterized in that, include: One or more single-cell batteries (400) according to any one of claims 1-10.

12. An energy storage system (100), characterized in that, include: The high-voltage cable (110), the first power conversion device (120), the second power conversion device (130), and the energy storage device (200) as described in claim 11 are respectively electrically connected to the energy storage device (200), the first power conversion device (120), and the second power conversion device (130). The first power conversion device (120) and the second power conversion device (130) are both used to generate electrical energy, and the energy storage device (200) is used to store the electrical energy.

13. A power supply system (300), characterized in that, include: Electrical equipment (310); and The energy storage device (200) of claim 11 or the energy storage system (100) of claim 12 is used to supply power to the electrical equipment (310).

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