Battery cell, processing method therefor, related apparatus, energy storage system and charging network

Abstract

The present application is applicable to the technical field of batteries, and provides a battery cell (1), a processing method therefor, a related apparatus, an energy storage system (1000), and a charging network (2000). The battery cell (1) comprises a casing (12), an electrode assembly (11), an insulating member (13), and a heat conducting member (14). At least one end of the casing (12) is provided with an end wall (1221). The electrode assembly (11) comprises a tab (112). The insulating member (13) is arranged between the end wall (1221) and the electrode assembly (11). The insulating member (13) is provided with a clearance hole (1301) opposite to the tab (112). At least part of the heat conducting member (14) is arranged in the clearance hole (1301). The heat conducting member (14) is arranged between the end wall (1221) and the tab (112). The thermal conductivity of the heat conducting member (14) is greater than that of the insulating member (13). In this way, the heat dissipation effect of the tab (112) can be improved, reducing the temperature rise.

Description

Battery cells and their processing methods, related devices, energy storage systems and charging networks Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery cell and its processing method, related devices, energy storage system and charging network. Background Technology

[0002] In related technologies, a battery cell typically includes a casing and an electrode assembly disposed within the casing. The electrode assembly includes a main body and tabs connected to the main body.

[0003] In some cases, the temperature rise of the tabs during battery cell operation is relatively high. The heat from the tabs inevitably transfers to the main body, causing a higher temperature rise in areas of the main body near the tabs. This can lead to the risk of the temperature in these areas exceeding the main body's temperature threshold. Consequently, this can affect the battery cell's overcurrent capability, thus impacting its performance and lifespan. Summary of the Invention

[0004] In view of the above problems, the purpose of this application is to provide a battery cell and its processing method, related devices, energy storage system and charging network, which can improve the technical problem of electrode temperature rise.

[0005] The technical solution adopted in the embodiments of this application is:

[0006] In a first aspect, embodiments of this application provide a single battery cell, comprising:

[0007] The outer casing has an end wall at at least one end along the first direction;

[0008] An electrode assembly, at least partially disposed within a housing; the electrode assembly includes tabs;

[0009] An insulating element is disposed between the end wall and the electrode assembly, and in the first direction, the insulating element has a clearance hole disposed opposite to the electrode tab;

[0010] A heat-conducting element is at least partially disposed within a clearance hole; in a first direction, the heat-conducting element is disposed between the end wall and the tab, and the thermal conductivity of the heat-conducting element is greater than that of the insulating element.

[0011] The battery cell provided in this application embodiment has a clearance hole on the insulating component, within which a heat-conducting component is disposed. The heat-conducting component is positioned between the end wall and the tab through the clearance hole, and its thermal conductivity is greater than that of the insulating component. This allows heat from the tab to be directly and efficiently conducted to the end wall via the heat-conducting component, and then released through the outer casing. This improves the heat dissipation effect of the tab, helping to reduce its temperature rise and alleviate the problem of excessive tab temperature. This design also reduces the risk of localized temperatures exceeding the temperature threshold in the main body of the electrode assembly, helping to improve the overcurrent capacity of the battery cell, thereby contributing to improved battery cell performance and extended battery cell lifespan.

[0012] In some embodiments, the heat-conducting element is an insulating structure.

[0013] This design gives the heat-conducting component both thermal conductivity and insulation properties. Thus, the heat-conducting component not only achieves efficient heat dissipation from the tabs but also provides insulation between the end wall and the tabs.

[0014] In some embodiments, the thermally conductive element is bonded to the tab and / or end wall.

[0015] By adopting the above technical solution, on the one hand, heat conduction between the tabs and end caps can be improved, enhancing the heat dissipation effect of the tabs and reducing the temperature rise of the electrode assembly. On the other hand, it facilitates the assembly of individual battery cells.

[0016] In some embodiments, the thermally conductive element includes a thermally conductive adhesive layer, which is bonded to the tab and the end wall.

[0017] By adopting the above technical solution, on the one hand, the heat-conducting component has a high thermal conductivity and better insulation performance, and on the other hand, it facilitates the assembly of battery cells.

[0018] In some embodiments, the material of the thermal conductive component includes at least one of silicone sealant, resin, and phase change material.

[0019] This design gives the heat-conducting component excellent thermal conductivity and insulation properties.

[0020] In some embodiments, the thermal conductivity of the heat-conducting element is ≥0.5 W / (m·k).

[0021] This design gives the heat-conducting component high thermal conductivity, which helps improve the heat dissipation of the tab and reduce the temperature rise of the electrode assembly.

[0022] In some embodiments, the thermal conductivity of the heat-conducting element is ≥1 W / (m·k).

[0023] This design gives the heat-conducting component high thermal conductivity, which helps improve the heat dissipation of the tab and reduce the temperature rise of the electrode assembly.

[0024] In some embodiments, the insulating member has a mounting hole along a first direction, and the mounting hole and the clearance hole are arranged along a second direction; the battery cell also includes an electrode terminal, which is mounted on the end wall and partially disposed in the mounting hole; in the second direction, the tab extends beyond the clearance hole toward the mounting hole to be electrically connected to the electrode terminal; wherein the first direction and the second direction intersect.

[0025] This design allows the tab to be electrically connected to the electrode terminal and also to contact the heat-conducting component by being opposite the clearance hole.

[0026] In some embodiments, in the second direction, the clearance hole penetrates the side of the insulator away from the mounting hole.

[0027] This design allows the clearance hole to have a larger size in the second direction, which in turn allows the heat-conducting component to have a larger size in the second direction. This helps to increase the contact area between the heat-conducting component and the tab, as well as the contact area between the heat-conducting component and the end wall, thereby improving the heat conduction effect between the tab and the end wall, improving the heat dissipation effect of the tab, and reducing the temperature rise of the tab.

[0028] In some embodiments, the size of the clearance hole in the third direction is greater than or equal to the size of the portion of the tab relative to the clearance hole in the third direction; wherein the third direction intersects the first direction and the second direction respectively.

[0029] This design allows the clearance hole to have a larger size in the third direction, which in turn allows the heat-conducting component to have a larger size in the third direction. This helps to increase the contact area between the heat-conducting component and the tab, as well as the contact area between the heat-conducting component and the end wall, thereby improving the heat conduction effect between the tab and the end wall, improving the heat dissipation effect of the tab, and reducing the temperature rise of the tab.

[0030] In some embodiments, in the third-party orientation, the clearance hole extends beyond at least one side of the tab.

[0031] This design allows the heat-conducting component to have a larger dimension in the third direction, which helps to increase the contact area between the heat-conducting component and the tab, as well as the contact area between the heat-conducting component and the end wall. This improves the heat conduction effect between the tab and the end wall, thereby enhancing the heat dissipation effect of the tab and reducing the temperature rise of the tab.

[0032] In some embodiments, the mounting hole is provided with clearance holes on both sides along the second direction, each clearance hole is provided with a heat-conducting element, and each heat-conducting element is disposed between the tab and the end wall.

[0033] Both sides of the mounting hole along the second direction are provided with clearance holes, and each clearance hole is provided with a heat-conducting element. This helps to increase the contact area between the tab and the heat-conducting element, and the contact area between the end wall and the heat-conducting element. This is beneficial to improve the heat conduction effect between the tab and the end wall, thereby improving the heat dissipation effect of the tab and reducing the temperature rise of the tab.

[0034] In some embodiments, the number of electrode components is one, and the electrode tab includes a first electrode tab portion and a second electrode tab portion with the same polarity; or, the number of electrode components is multiple, and the electrode tabs of the multiple electrode components include a first electrode tab portion and a second electrode tab portion with the same polarity.

[0035] The first electrode tab and the second electrode tab are respectively disposed opposite to the clearance holes on both sides of the mounting hole along the second direction. In the clearance holes on both sides of the mounting hole along the second direction, the heat-conducting element in one clearance hole is disposed between the first electrode tab and the end wall, and the heat-conducting element in the other clearance hole is disposed between the second electrode tab and the end wall. Both the first electrode tab and the second electrode tab are electrically connected to the electrode terminal.

[0036] By adopting the above technical solution, heat-conducting elements can be provided between the first electrode tab and the end wall, and between the second electrode tab and the end wall. That is, both parts of the electrode tab can contact the heat-conducting elements, which increases the number of heat-conducting elements and the contact area between the electrode tab and the heat-conducting elements, as well as the contact area between the end wall and the heat-conducting elements. This is beneficial to improve the heat conduction effect between the electrode tab and the end wall, thereby improving the heat dissipation effect of the electrode tab and reducing the temperature rise of the electrode tab.

[0037] In some embodiments, the number of electrode assemblies is two, wherein one electrode assembly has a first tab portion and the other electrode assembly has a second tab portion.

[0038] This configuration allows the electrode tab to be divided into a first electrode tab section and a second electrode tab section, thereby increasing the contact area between the electrode tab and the heat-conducting component, as well as the contact area between the end wall and the heat-conducting component.

[0039] In some embodiments, mounting holes and clearance holes are spaced apart along a second direction.

[0040] This design allows the enclosure to protect the electrode terminals inside the mounting holes.

[0041] In some embodiments, the electrode tabs include a first electrode tab and a second electrode tab with different polarities, and the clearance hole includes a first clearance hole and a second clearance hole, both of which are provided with heat-conducting elements;

[0042] In the first direction, the first clearance hole is disposed opposite to the first electrode tab, and the heat-conducting element in the first clearance hole is disposed between the end wall and the first electrode tab;

[0043] In the first direction, the second clearance hole is disposed opposite to the second electrode tab, and the heat-conducting element in the second clearance hole is disposed between the end wall and the second electrode tab.

[0044] By adopting the above technical solution, heat-conducting components are provided between the positive electrode tab and the end wall, and between the negative electrode tab and the end wall. This can improve the problem of local temperature rise in the main body of the electrode assembly exceeding the temperature threshold, which helps to improve the overcurrent capacity of the battery cell, thereby helping to improve the performance of the battery cell and extend its service life.

[0045] In some embodiments, the housing has an end wall at one end along a first direction, the first tab and the second tab are spaced apart along a third direction, and the first clearance hole and the second clearance hole are arranged along a third direction.

[0046] By adopting the above technical solution, the first electrode and the second electrode are disposed at one end of the main body of the electrode assembly along the first direction, and the heat on the first electrode and the second electrode can be conducted to the same end wall through the corresponding heat-conducting element.

[0047] In some embodiments, in the first direction, both ends of the housing are provided with end walls, and the end walls at both ends of the housing are respectively the first end wall and the second end wall.

[0048] The insulating element includes a first insulating element and a second insulating element, and in a first direction, the first insulating element is disposed between the electrode assembly and the first end wall, and the second insulating element is disposed between the electrode assembly and the second end wall;

[0049] Both the first insulating component and the second insulating component are provided with clearance holes. The clearance hole on the first insulating component is the first clearance hole, and the clearance hole on the second insulating component is the second clearance hole.

[0050] In the first direction, a first tab is disposed at one end of the electrode assembly near the first end wall, a second tab is disposed at one end of the electrode assembly near the second end wall, a heat-conducting element in the first clearance hole is disposed between the first end wall and the first tab, and a heat-conducting element in the second clearance hole is disposed between the second end wall and the second tab.

[0051] By adopting the above technical solution, the first electrode and the second electrode are respectively located at opposite ends of the main body along the first direction, and the heat on the first electrode and the second electrode can be conducted to different end walls through the corresponding heat-conducting elements.

[0052] In some embodiments, the housing further includes a sidewall connected to the end wall and disposed around the outer periphery of the electrode assembly; a heat-conducting element is disposed on the sidewall.

[0053] By adopting the above technical solution, the heat-conducting component can transfer the heat on the tab to the side wall of the outer casing and release it through the side wall. This helps to improve the heat dissipation effect of the tab and reduce the temperature rise of the tab.

[0054] In some embodiments, the battery cell further includes an insulating film disposed within the housing and at least surrounding the outer periphery of the electrode assembly; at least a portion of the heat-conducting element is disposed between the tab and the insulating film.

[0055] By having at least a portion of the heat-conducting element disposed between the tab and the insulating film, the tab can also have a heat-conducting element disposed at the position opposite to the insulating film. This increases the contact area between the tab and the heat-conducting element, which helps to improve the heat dissipation effect of the tab and thus reduces the temperature rise of the tab.

[0056] In some embodiments, the housing includes a housing and an end cap, the end cap being mounted on at least one end of the housing along a first direction, the electrode assembly being disposed within a space formed by the housing and the end cap, and the end cap including an end wall.

[0057] By adopting the above technical solution, the heat-conducting component can be first placed on at least one of the end wall of the end cap or the tab, then the electrode assembly can be installed inside the housing, and finally the end cap can be installed on the housing, thus realizing that the heat-conducting component is placed between the tab and the end wall. This facilitates the assembly of the battery cell.

[0058] Secondly, embodiments of this application provide a method for processing a single battery cell, including:

[0059] A heat-conducting element is provided on at least one of the tab and the end wall;

[0060] The electrode assembly and the insulator are installed inside the housing such that the heat-conducting element is disposed between the tab and the end wall, and is at least partially disposed within the clearance hole of the insulator.

[0061] The battery cell processing method provided in this application involves an insulating component with clearance holes. A heat-conducting component is housed within these clearance holes, positioned between the end wall and the tab. The heat-conducting component has a higher thermal conductivity than the insulating component, allowing heat from the tab to be directly and efficiently conducted to the end wall and then released through the casing. This improves the heat dissipation of the tab, reducing its temperature rise and mitigating the problem of excessive tab temperature. This design also reduces the risk of localized temperatures exceeding a temperature threshold in the main body, improving the battery cell's overcurrent capability and thus enhancing its performance and extending its lifespan.

[0062] In some embodiments, a heat-conducting element is provided on at least one of the tab and the end wall, including:

[0063] Attach the thermally conductive element to the tab; and / or attach the thermally conductive element to the end wall of the end cap.

[0064] By adopting the above technical solution, a heat-conducting component is provided on at least one of the tab and the end wall in the step of bonding the heat-conducting component. This helps to improve the fixation reliability of the heat-conducting component, thereby facilitating its placement between the tab and the end wall and reducing the temperature rise of the tab. Furthermore, it also facilitates the assembly of the battery cell.

[0065] In some embodiments, the electrode assembly, the thermally conductive element, and the insulating element are mounted within a housing such that the thermally conductive element is disposed between the tab and the end wall, and is at least partially disposed within a clearance hole in the insulating element, including:

[0066] The electrode assembly is installed inside the housing of the outer casing;

[0067] The insulating element and end cap are mounted on the housing such that the heat-conducting element is disposed between the end wall of the tab and the end cap, and is at least partially disposed within the clearance hole.

[0068] By adopting the above technical solution, the end cap includes the end wall, which facilitates the assembly of battery cells.

[0069] Thirdly, embodiments of this application provide a battery device, including a single battery cell.

[0070] The battery device provided in this application embodiment, by employing the battery cells mentioned above, helps to improve the current carrying capacity of the battery cells, thereby improving the current carrying capacity of the battery device, which in turn helps to improve the performance of the battery device and extend its service life, thus improving the reliability of the battery device.

[0071] Fourthly, embodiments of this application provide an electrical device, including a single battery cell or a battery device.

[0072] The electrical device provided in this application, by employing the aforementioned battery cells or battery devices, helps to improve the performance and extend the service life of the electrical device, thereby enhancing its reliability.

[0073] Fifthly, embodiments of this application provide an energy storage device, including a single battery cell or a battery assembly.

[0074] The energy storage device provided in this application embodiment, by employing the aforementioned battery cells or battery devices, can improve the performance and extend the service life of the energy storage device, thereby enhancing its reliability.

[0075] In a sixth aspect, embodiments of this application provide an energy storage system, including a power conversion device and an energy storage device, wherein the power conversion device is used to electrically connect a power generation device and an energy storage device.

[0076] The energy storage system provided in this application, by employing the energy storage devices described above, helps to improve the performance and extend the service life of the energy storage system, thereby enhancing its reliability.

[0077] In a seventh aspect, embodiments of this application provide a charging network, including charging piles, and including an energy storage device or energy storage system, wherein the energy storage device is used to provide electrical energy to the charging piles.

[0078] The charging network provided in this application embodiment, by employing the energy storage device or energy storage system mentioned above, helps to improve the performance of the charging network and extend its service life, thereby improving the reliability of the charging network.

[0079] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0080] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies 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.

[0081] Figure 1 is a schematic diagram of an energy storage system provided in some embodiments of this application;

[0082] Figure 2 is a schematic diagram of a charging network provided in some embodiments of this application;

[0083] Figure 3 is a schematic diagram of a vehicle provided in some embodiments of this application;

[0084] Figure 4 is an exploded view of a battery device provided in some embodiments of this application;

[0085] Figure 5 is a three-dimensional structural diagram of a battery cell provided in some embodiments of this application;

[0086] Figure 6 is an exploded view of a battery cell provided in some embodiments of this application;

[0087] Figure 7 is a cross-sectional view of Figure 5 along AA;

[0088] Figure 8 is a cross-sectional view along BB in Figure 5;

[0089] Figure 9 is an enlarged view of point C in Figure 8;

[0090] Figure 10 is an exploded view of the end cap, insulating component, electrode terminal, and heat-conducting component of a battery cell provided in some embodiments of this application;

[0091] Figure 11 is a schematic diagram of the insulating component of a battery cell provided in some embodiments of this application;

[0092] Figure 12 is a schematic diagram of the fit between the end cap, insulating component, electrode terminal, heat-conducting component and tab of a battery cell provided in some embodiments of this application;

[0093] Figure 13 is a cross-sectional view of a battery cell provided in some other embodiments of this application;

[0094] Figure 14 is a flowchart of a battery cell processing method provided in some embodiments of this application.

[0095] In the figures, the following labels are used: 1000-Energy storage system; 1100-Power conversion device; 1200-Generation device; 2000-Charging network; 2100-Charging pile; 2200-Connector; 3000-Vehicle; 3100-Controller; 3200-Motor; 100-Energy storage device; 10-Battery device; 1-Battery cell; 11-Electrode assembly; 111-Main body; 112-Taper; 112a-First tab; 112b-Second tab; 1121-First tab portion; 1122-Second tab portion; 12-Outer shell; 121-Shell; 1211-Side wall; 122-End cap; 1221-End wall; 1221a-First end wall; 1221b-Second end wall; 13-Insulator; 13a-First insulator; 13b-Second insulating component; 131-Enclosure portion; 1301-Allowing hole; 1301a-First clearance hole; 1301b-Second clearance hole; 1302-Mounting hole; 1302a-First mounting hole; 1302b-Second mounting hole; 14-Heat-conducting component; 14a-First heat-conducting component; 14b-Second heat-conducting component; 15-Electrode terminal; 15a-Positive electrode terminal; 15b-Negative electrode terminal; 16-Insulating film; 2-Box body; 21-First part; 22-Second part; Z-First direction; Y-Second direction; X-Third direction. Detailed Implementation

[0096] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0097] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0098] Unless otherwise specified, all technical features and optional technical features of the embodiments of this application can be combined with each other to form new technical solutions.

[0099] In the description of the embodiments of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0100] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0101] In the description of the embodiments of this application, "multiple" means two or more, and unless otherwise explicitly specified, "two or more" includes two. Correspondingly, "multiple groups" means two or more groups, including two groups.

[0102] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0103] In the description of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three possibilities: A exists, A and B exist simultaneously, and B exists. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0104] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0105] In related technologies, a battery cell typically includes a casing and an electrode assembly disposed within the casing. The electrode assembly includes a main body and tabs connected to the main body, and the temperature threshold of the tabs is generally higher than the temperature threshold of the main body.

[0106] In some cases, due to factors such as poor heat dissipation of the tabs, the temperature rise of the tabs during battery cell operation is relatively high. The heat from the tabs inevitably transfers to the main body, causing a corresponding increase in temperature in areas of the main body near the tabs. This can lead to the risk of the temperature in these areas exceeding the main body's temperature threshold. Consequently, this can affect the battery cell's overcurrent capability, thereby impacting its performance and lifespan.

[0107] Based on the above considerations, embodiments of this application provide a battery cell, its processing method, related devices, energy storage system, and charging network. By providing clearance holes on the insulating component and housing a heat-conducting component within these holes, the heat-conducting component is positioned between the end wall and the tab, with its thermal conductivity exceeding that of the insulating component. This allows heat from the tab to be directly and efficiently conducted to the end wall and then released through the outer casing. This improves the heat dissipation of the tab, helping to reduce its temperature rise and address the issue of excessive tab temperature. This design also reduces the risk of localized temperatures exceeding temperature thresholds in the main body of the electrode assembly, improving the battery cell's overcurrent capability and thus enhancing its performance and extending its lifespan.

[0108] It should be noted that the relevant devices may include battery devices, power-consuming devices, and energy storage devices.

[0109] The battery cell involved in the embodiments of this application refers to the smallest unit used for storing and outputting electrical energy. The battery cell can be a secondary battery or a primary battery. A secondary battery is a battery cell that can be recharged after discharge to activate the active materials and continue to be used.

[0110] The battery cells can be cylindrical, flat, cuboid, or other shapes. Battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0111] The battery device involved in the embodiments of this application can be a single physical module comprising one or more battery cells, used to provide voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel, or in a mixed connection via a busbar. A mixed connection refers to multiple battery cells being connected in both series and parallel configurations.

[0112] In some embodiments, the battery device can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. As an example, multiple battery cells can be fixed to form a battery module by cable ties or the like. As an example, multiple battery cells can also be fixed to form a battery module by end plates, side plates, or the like.

[0113] In some embodiments, the battery device can be a battery pack, which may include a housing and individual battery cells. As an example, individual battery cells may be directly housed within the housing. As another example, multiple individual battery cells may first be assembled into one or more battery modules and then housed within the housing.

[0114] The battery cells and battery devices involved in the embodiments of this application can be used in energy storage devices that use battery cells or battery devices as energy storage elements.

[0115] The energy storage device involved in the embodiments of this application can be an energy storage container or an energy storage cabinet.

[0116] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, energy storage devices can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours.

[0117] The energy storage device may include one or more battery clusters, and the battery clusters may include multiple battery devices.

[0118] In some embodiments, multiple battery devices in a battery cluster can be connected in series via a busbar to increase the voltage of the energy storage device.

[0119] In some embodiments, when the energy storage device includes multiple battery clusters, the multiple battery clusters can be connected in parallel to increase the capacity of the energy storage device.

[0120] In some embodiments, the energy storage device may further include a cabinet in which the battery clusters are housed.

[0121] In some embodiments, the energy storage device may further include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0122] In some embodiments, the thermal management module may include a liquid cooling unit that provides coolant to each battery device via piping for regulating the temperature of individual battery cells.

[0123] In some embodiments, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For example, the main control module can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0124] In some embodiments, the central control module can serve as the battery management unit of the energy storage device, used for monitoring and managing the energy storage device. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device. For example, the central control module can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0125] In some embodiments, the fire protection module may include a control panel, detectors, alarm devices, etc., for detecting, alarming, or extinguishing fires in the energy storage device.

[0126] In some embodiments, the power distribution module can be used to distribute power to modules in the energy storage device that require electricity.

[0127] The energy storage system involved in the embodiments of this application can be any power system that requires energy storage devices.

[0128] In some embodiments, please refer to FIG1, which is a schematic diagram of an energy storage system 1000 provided in some embodiments of this application. The energy storage system 1000 involved in the embodiments of this application may include an energy storage device 100 and a power converter system (PCS) 1100, which is connected between a power generation device 1200 and the energy storage device 100. The power generation device 1200 generates electrical energy, which can be stored in the energy storage device 100 through the power converter system 1100. The number of energy storage devices 100 may be one or more.

[0129] As an example, the power generation device 1200 can specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc.

[0130] In some embodiments, please refer to FIG2, which is a schematic diagram of a charging network 2000 provided in some embodiments of this application. The charging network 2000 involved in the embodiments of this application may include a charging pile 2100 and an energy storage device 100. The charging pile 2100 is electrically connected to the energy storage device 100, and the energy storage device 100 is used to provide electrical energy to the charging pile 2100.

[0131] The charging pile 2100 and the battery device in the energy storage device 100 can be electrically connected by a cable, and the battery device can provide the electrical energy stored in it to the charging pile 2100.

[0132] The charging pile 2100 may have one or more connectors 2200, which are used to connect to electrical devices (such as vehicles) so as to provide power to the electrical devices.

[0133] The energy storage device 100 can be located inside the charging pile 2100 (e.g., an integrated energy storage and charging unit) or outside the charging pile 2100.

[0134] The battery cell and battery device provided in this application embodiment can also be used in electrical devices that use the battery cell or battery device as a power source.

[0135] Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, vehicles, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. Based on the power source, vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Based on the drive method, vehicles can be front-wheel drive vehicles, rear-wheel drive vehicles, or four-wheel drive vehicles.

[0136] For ease of description, this application uses a vehicle as an example to illustrate the embodiments of the electrical device.

[0137] In some embodiments, please refer to FIG3, which is a schematic diagram of a vehicle 3000 provided in some embodiments of this application. A battery device 10 is disposed inside the vehicle 3000, and the battery device 10 may be located at the bottom, front, or rear of the vehicle 3000. The battery device 10 can be used to power the vehicle 3000; for example, the battery device 10 can serve as the operating power source for the vehicle 3000. The vehicle 3000 may also include a controller 3100 and a motor 3200. The controller 3100 is used to control the battery device 10 to supply power to the motor 3200, for example, to meet the power requirements of the vehicle 3000 during startup, navigation, and driving.

[0138] In some embodiments, the battery device 10 can not only serve as the operating power source for the vehicle 3000, but also as the driving power source for the vehicle 3000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 3000.

[0139] In some embodiments, please refer to FIG4, which is an exploded view of a battery device 10 provided in some embodiments of this application. The battery device 10 may include a housing 2 and a battery cell 1. The housing 2 is a structure with internal space, and the internal space of the housing 2 is used to accommodate the battery cell 1.

[0140] The housing 2 can adopt various structures. In some embodiments, the housing 2 may include a first part 21 and a second part 22, which overlap each other and jointly define the internal space of the housing 2, which is a closed space. Here, "closed" means covered or shut off; it can be sealed or unsealed. That is, the housing 2 can be a sealed structure or an unsealed structure. Referring to Figure 4, both the first part 21 and the second part 22 can be hollow structures with an opening at one end. The open side of the first part 21 overlaps the open side of the second part 22, so that the first part 21 and the second part 22 jointly define the internal space of the housing 2. Alternatively, the first part 21 can be a hollow structure with an opening at one end, and the second part 22 can be a plate-like structure. The second part 22 overlaps the open side of the first part 21, so that the first part 21 and the second part 22 jointly define the internal space of the housing 2. The housing 2 composed of the first part 21 and the second part 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0141] In some embodiments, multiple battery cells 1 can be connected in series, parallel, or mixed to form a whole, and then the whole formed by the multiple battery cells 1 is directly housed in the internal space of the housing 2. In other embodiments, multiple battery cells 1 can also be connected in series, parallel, or mixed to form a battery module, and the battery module is housed in the internal space of the housing 2. In still other embodiments, multiple battery cells 1 can also be connected in series, parallel, or mixed to form multiple battery modules, and the multiple battery modules can then be connected in series, parallel, or mixed to form a whole, and housed in the internal space of the housing 2.

[0142] In some embodiments, referring to Figures 3 and 4, the housing 2 of the battery device 10 can be part of the chassis structure of the vehicle 3000. For example, a portion of the housing 2 can be at least a portion of the floor of the vehicle 3000, or a portion of the housing 2 can be at least a portion of the crossbeams and longitudinal beams of the vehicle 3000.

[0143] In some embodiments, please refer to Figures 5 to 7 and Figure 13 together, and in conjunction with other accompanying drawings. Figure 5 is a perspective structural diagram of a battery cell 1 provided in some embodiments of this application; Figure 6 is an exploded view of a battery cell 1 provided in some embodiments of this application; Figure 7 is a cross-sectional view along line AA in Figure 5; and Figure 13 is a cross-sectional view of a battery cell 1 provided in other embodiments of this application. The battery cell 1 provided in the embodiments of this application may include an electrode assembly 11 and a housing 12.

[0144] Electrode assembly 11 is the component in the battery cell 1 where the electrochemical reaction occurs. Electrode assembly 11 is mainly formed by winding or stacking positive and negative electrode sheets, with a separator between them. The portions of the positive and negative electrode sheets containing active material constitute the main body 111 of electrode assembly 11, while the portions of the positive and negative electrode sheets without active material each constitute tabs 112. The tab 112 of the positive electrode sheet is the positive tab, and the tab 112 of the negative electrode sheet is the negative tab. As shown in Figures 6 and 7, the positive and negative tabs can be located together at one end of the main body 111; or, as shown in Figure 13, the positive and negative tabs can be located at opposite ends of the main body 111.

[0145] In a single battery cell 1, there can be one electrode assembly 11 or multiple electrode assemblies 11, as shown in Figure 6.

[0146] In some contexts, electrode assembly 11 may also be referred to as bare cell, wound body, laminate, etc.

[0147] In some embodiments, the battery cell 1 may further include an electrolyte, which acts as a conductor of ions between the positive and negative electrode plates. The electrolyte described in this application embodiment may be liquid, gel-like, or solid.

[0148] The housing 12 is used to define the internal environment of the battery cell 1 and to house the electrode assembly 11 and the electrolyte.

[0149] In some embodiments, please refer to Figures 5 to 7 together with other figures. The housing 12 may include a housing 121 and an end cap 122, which are components used to jointly define the internal environment of the battery cell 1. The internal environment defined by the housing 121 and the end cap 122 is used to accommodate the electrode assembly 11 and the electrolyte. The housing 121 and the end cap 122 may be independent components. Specifically, the housing 121 has an opening, and the end cap 122 is disposed over the opening of the housing 121 to jointly define the internal environment of the battery cell 1 with the housing 121, and to isolate the internal environment of the battery cell 1 from the external environment.

[0150] The outer casing 12 can be either a sealed or unsealed structure. As an example, when the outer casing 12 is a sealed structure, it protects the electrode assembly 11 and, to some extent, prevents leakage such as electrolyte leakage. As an example, when the outer casing 12 is an unsealed structure, it still protects the electrode assembly 11, and a sealing bag may be included between the outer casing 12 and the electrode assembly 11 to encapsulate the electrode assembly 11 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating structure, an aluminum-plastic film, etc.

[0151] As shown in Figures 5 to 7, there can be one end cap 122, which is located at one end of the housing 121. Alternatively, as shown in Figure 13, there can be two end caps 122, which are located at opposite ends of the housing 121.

[0152] The housing 121 can be cylindrical, square, or other shapes, depending on the specific shape and size of the electrode assembly. The housing 121 and end cap 122 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0153] In some embodiments, referring to Figures 5 to 7, the battery cell 1 may further include electrode terminals 15. Electrode terminals 15 are components with conductive properties, serving as current transmission terminals for the battery cell 1. The electrode terminals 15 may be, but are not limited to, terminals.

[0154] Electrode terminal 15 is electrically connected to electrode assembly 11. Specifically, electrode terminal 15 is electrically connected to tab 112 of electrode assembly 11. Electrode terminal 15 and tab 112 can be directly electrically connected by welding, bonding, or other methods. Alternatively, a transition structure can be provided between electrode terminal 15 and tab 112 to facilitate current flow, thereby indirectly achieving electrical connection between electrode terminal 15 and tab 112.

[0155] The transition structure refers to a metal structure with electrical conductivity, such as, but not limited to, a copper busbar.

[0156] In some embodiments, please refer to Figures 5 to 7 together. There are two electrode terminals 15, which are a positive electrode terminal and a negative electrode terminal, respectively. The positive electrode terminal is electrically connected to the positive electrode tab of the electrode assembly 11, and the negative electrode terminal is electrically connected to the negative electrode tab of the electrode assembly 11.

[0157] In some embodiments, as shown in Figures 5 to 7, the electrode terminal 15 is disposed on the housing 12. Specifically, the electrode terminal 15 may be disposed on the housing 121 of the housing 12. As shown in Figures 5 to 7, the electrode terminal 15 may also be disposed on the end cap 122 of the housing 12.

[0158] The positive electrode terminal and the negative electrode terminal can be simultaneously disposed on the housing 121. Alternatively, as shown in Figures 5 to 7, the positive electrode terminal and the negative electrode terminal can be simultaneously disposed on the end cover 122. Alternatively, one of the positive electrode terminal and the negative electrode terminal can be disposed on the housing 121 and the other on the end cover 122.

[0159] As shown in Figures 5 to 7, the positive electrode terminal and the negative electrode terminal can be located at the same end of the housing 12. Alternatively, as shown in Figure 13, the positive electrode terminal and the negative electrode terminal can be located at opposite ends of the housing 12.

[0160] In some embodiments, referring to Figures 6 and 7 together, the battery cell 1 may further include a lower plastic component. The lower plastic component is a plastic part primarily used to provide insulation within the internal environment of the battery cell 1. Specifically, the lower plastic component is disposed within the housing 12 and at the end of the electrode assembly 11 having tabs 112, thereby achieving insulation between the housing 12 and the electrode assembly 11.

[0161] In some embodiments, referring to Figures 6 and 7 together, the number of lower plastic pieces can be one, and the lower plastic piece is disposed at one end of the electrode assembly 11. Specifically, the positive electrode tab and the negative electrode tab are disposed at the same end of the main body 111, and the lower plastic piece is disposed at the end of the electrode assembly 11 that has the positive electrode tab and the negative electrode tab.

[0162] In some embodiments, as shown in FIG13, there may be two lower plastic plates, which are respectively disposed at opposite ends of the electrode assembly 11. Specifically, the positive electrode tab and the negative electrode tab of the electrode assembly 11 are respectively disposed at opposite ends of the main body 111, and one lower plastic plate is disposed at the end of the electrode assembly 11 with the positive electrode tab, and the other lower plastic plate is disposed at the end of the electrode assembly 11 with the negative electrode tab.

[0163] Please refer to Figures 6 to 13 together, and in conjunction with other accompanying drawings. Figure 8 is a cross-sectional view along BB in Figure 5, and Figure 9 is an enlarged view of point D in Figure 8. Figure 10 is an exploded view of the end cap 122, insulating member 13, electrode terminal 15, and heat-conducting member 14 of the battery cell 1 provided in some embodiments of this application. Figure 11 is a schematic diagram of the insulating member 13 of the battery cell 1 provided in some embodiments of this application, specifically a schematic diagram of the insulating member 13 from a first direction Z perspective. Figure 12 is a schematic diagram of the cooperation of the end cap 122, insulating member 13, electrode terminal 15, heat-conducting member 14, and tab 112 of the battery cell 1 provided in some embodiments of this application, specifically a schematic diagram of the cooperation of the end cap 122, insulating member 13, electrode terminal 15, heat-conducting member 14, and tab 112 from a first direction Z perspective. The battery cell 1 provided in the embodiments of this application includes a housing 12, an electrode assembly 11, an insulating member 13, and a heat-conducting member 14. The housing 12 has an end wall 1221 at at least one end along the first direction Z. At least a portion of the electrode assembly 11 is disposed within the housing 12. The electrode assembly 11 includes a tab 112. An insulating member 13 is disposed between the end wall 1221 and the electrode assembly 11, and in the first direction Z, the insulating member 13 has a clearance hole 1301 disposed opposite to the tab 112. At least a portion of the thermally conductive member 14 is disposed within the clearance hole 1301. In the first direction Z, the thermally conductive member 14 is disposed between the end wall 1221 and the tab 112. The thermal conductivity of the thermally conductive member 14 is greater than that of the insulating member 13.

[0164] As shown in Figures 6 to 12, the outer casing 12 has an end wall 1221 at one end along the first direction Z. Alternatively, as shown in Figure 13, the outer casing 12 has end walls 1221 at both ends along the first direction Z.

[0165] The end wall 1221 can be disposed on the end cover 122, as shown in Figures 6 to 13. Alternatively, the end wall 1221 can also be disposed on the housing 121.

[0166] Understandably, the electrode assembly 11 includes a main body 111 and a tab 112. At least a portion of the electrode assembly 11 is disposed within the housing 12, meaning that at least a portion of the integral structure formed by the main body 111 and the tab 112 of the electrode assembly 11 is disposed within the housing 12. Understandably, the end wall 1221 and the electrode assembly 11 are arranged along a first direction Z. As an example, as shown in Figures 6 to 13, both the main body 111 and the tab 112 are disposed within the housing 12.

[0167] In some possible designs, the electrode assembly 11 has a tab 112 at at least one end along the first direction Z. Understandably, the tab 112 extends beyond the body portion 111 along the first direction Z toward the end wall 1221; specifically, in the first direction Z, the tab 112 extends beyond the body portion 111 in a direction close to the end wall 1221. In other words, the body portion 111 and the tab 112 are arranged generally along the first direction Z, and in the first direction Z, the tab 112 is generally located between the body portion 111 and the end wall 1221.

[0168] The electrode tab 112 may include a positive electrode tab or a negative electrode tab. When the electrode tab 112 includes a positive electrode tab, the clearance hole 1301 may include a first clearance hole 1301a, and the heat-conducting element 14 may include a first heat-conducting element 14a. The positive electrode tab and the first clearance hole 1301a are disposed opposite to each other along the first direction Z. At least a portion of the first heat-conducting element 14a is disposed within the first clearance hole 1301a, and the first heat-conducting element 14a is disposed between the positive electrode tab and the end wall 1221 along the first direction Z. When the tab 112 includes a negative tab, the clearance hole 1301 may include a second clearance hole 1301b, and the heat conductor 14 may include a second heat conductor 14b. The negative tab and the second clearance hole 1301b are arranged opposite to each other along the first direction Z. At least a portion of the second heat conductor 14b is disposed in the second clearance hole 1301b, and the second heat conductor 14b is disposed between the negative tab and the end wall 1221 along the first direction Z.

[0169] As shown in Figures 6 to 12, the electrode tab 112 is disposed at one end of the main body portion 111 along the first direction Z; that is, the positive electrode tab and the negative electrode tab are disposed at one end of the main body portion 111 along the first direction Z. Alternatively, as shown in Figure 13, there are multiple electrode tabs 112, with the multiple electrode tabs 112 respectively disposed at opposite ends of the main body portion 111 along the first direction Z; that is, the positive electrode tab and the negative electrode tab are respectively disposed at opposite ends of the main body portion 111 along the first direction Z.

[0170] Insulating component 13 refers to a component with insulating properties, mainly disposed between end wall 1221 and electrode assembly 11, for achieving insulation between electrode assembly 11 and end wall 1221. Insulating component 13 may be, but is not limited to, a plastic component; for example, insulating component 13 may be the lower plastic mentioned above.

[0171] In the first direction Z, the insulating member 13 is disposed between the end wall 1221 and the electrode assembly 11. This means that in the first direction Z, the insulating member 13 is disposed between the entire body portion 111 and the tab 112 of the electrode assembly 11 and the end wall 1221. That is, in the first direction Z, the insulating member 13 is disposed between the body portion 111 and the end wall 1221, and also between the tab 112 and the end wall 1221. It can be understood that the insulating member 13 and the electrode assembly 11 are disposed opposite each other in the first direction Z, and the insulating member 13 and the end cap 122 are disposed opposite each other in the first direction Z.

[0172] In some possible designs, as shown in Figures 6 to 12, in the first direction Z, one end of the housing 12 has an end wall 1221, a tab 112 is located at the end of the main body 111 near the end wall 1221, and an insulating member 13 is located between the electrode assembly 11 and the end wall 1221. Alternatively, in some other possible designs, as shown in Figure 13, in the first direction Z, both opposite ends of the housing 12 have end walls 1221, both opposite ends of the main body 111 have tabs 112, and both opposite ends of the electrode assembly 11 have insulating members 13, with the insulating member 13 at each end located between the electrode assembly 11 and the end wall 1221 at each end.

[0173] In the first direction Z, the insulating member 13 is provided with a clearance hole 1301 opposite to the tab 112. This means that the insulating member 13 has the clearance hole 1301 along the first direction Z, that is, the clearance hole 1301 is provided through both ends of the insulating member 13 along the first direction Z. Furthermore, the clearance hole 1301 and the tab 112 are opposite each other along the first direction Z. Based on this, the clearance hole 1301 and the tab 112 are opposite each other along the first direction Z, and the clearance hole 1301 and the end cap 122 are also opposite each other along the first direction Z, so that the tab 112 and the end cap 122 are opposite each other along the first direction Z through the clearance hole 1301.

[0174] The heat-conducting component 14 refers to a component with thermal conductivity, mainly used to conduct heat from the tab 112 to the end wall 1221. The tab 112 is disposed opposite to the end cap 122 along the first direction Z via a clearance hole 1301, and at least a portion of the heat-conducting component 14 is disposed within the clearance hole 1301, so that the heat-conducting component 14 can be disposed between the end wall 1221 and the tab 112 in the first direction Z.

[0175] In the first direction Z, the heat-conducting element 14 is disposed between the end wall 1221 and the tab 112, meaning that in the first direction Z, the heat-conducting element 14 is disposed between the end wall 1221 and the tab 112, and one side of the heat-conducting element 14 is disposed on the tab 112, and the other side of the heat-conducting element 14 is disposed on the end wall 1221.

[0176] The heat-conducting element 14 can abut against the tab 112, and the heat-conducting element 14 can also abut against the end wall 1221, which can improve the heat conduction effect.

[0177] The thermal conductivity of the heat-conducting component 14 is greater than that of the insulating component 13, resulting in a higher thermal conductivity efficiency for the heat-conducting component 14 compared to that for the insulating component 13. For example, the thermal conductivity of the insulating component 13 is typically ≤0.21 W / (m·K), while the thermal conductivity of the heat-conducting component 14 is greater than 0.21 W / (m·K), thus making the thermal conductivity of the heat-conducting component 14 greater than that of the insulating component 13.

[0178] In some cases, the tab 112 can be disposed between the insulator 13 and the main body 111, so that the heat on the tab 112 needs to be conducted to the end wall 1221 through the insulator 13. In the battery cell 1 provided in this application embodiment, the heat-conducting element 14 is disposed between the tab 112 and the end wall 1221 through the provision of the clearance hole 1301, so that the heat on the tab 112 can be conducted to the end wall 1221 through the heat-conducting element 14. Since the thermal conductivity of the heat-conducting element 14 is greater than that of the insulator 13, the heat on the tab 112 is conducted to the end wall 1221 through the heat-conducting element 14, which is more efficient than the solution where the heat on the tab 112 needs to be conducted to the end wall 1221 through the insulator 13, and the heat dissipation effect of the tab 112 is better.

[0179] As an example, end wall 1221 is provided on end cap 122. In this way, heat on tab 112 can be conducted to end cap 122 through heat conductor 14 and released through end cap 122.

[0180] The battery cell 1 provided in this embodiment has a clearance hole 1301 on the insulating member 13, and a heat-conducting member 14 is provided in the clearance hole 1301. The heat-conducting member 14 is disposed between the end wall 1221 and the tab 112 through the clearance hole 1301, and the thermal conductivity of the heat-conducting member 14 is greater than that of the insulating member 13. This allows the heat on the tab 112 to be directly and efficiently conducted to the end wall 1221 through the heat-conducting member 14, and then released through the outer casing 12. In this way, the heat dissipation effect of the tab 112 can be improved, which helps to reduce the temperature rise of the tab 112 and improve the problem of the temperature rise of the tab 112. This arrangement can reduce the risk of the local temperature of the main body 111 of the electrode assembly 11 exceeding the temperature threshold, which helps to improve the overcurrent capacity of the battery cell 1, thereby helping to improve the performance of the battery cell 1 and extend the service life of the battery cell 1, and thus improve the reliability of the battery cell 1.

[0181] In some embodiments, the heat-conducting element 14 is used to insulate the tab 112 and the end wall 1221 from each other.

[0182] Understandably, at least a portion of the heat-conducting element 14 is an insulating structure, and the tab 112 and end wall 1221 can be insulated by the heat-conducting element 14.

[0183] In some possible designs, the heat-conducting element 14 is an insulating structure. Alternatively, in other possible designs, the heat-conducting element 14 and the tab 112 are insulated from each other; for example, the portion of the heat-conducting element 14 near the tab 112 is insulated, or an insulating component is provided between the heat-conducting element 14 and the tab 112. Or, in still other possible designs, the heat-conducting element 14 is insulated from the end wall 1221; for example, the portion of the heat-conducting element 14 near the end wall 1221 is insulated, or an insulating component is provided between the heat-conducting element 14 and the end wall 1221.

[0184] In some embodiments, the heat-conducting element 14 is an insulating structure.

[0185] This configuration gives the heat-conducting component 14 both thermal conductivity and insulation properties. Thus, the heat-conducting component 14 not only achieves efficient heat dissipation from the tab 112, but also provides insulation between the end wall 1221 and the tab 112.

[0186] In some embodiments, please refer to Figures 8 and 9 together, and in conjunction with other figures. The heat-conducting element 14 is bonded to the tab 112.

[0187] The heat-conducting element 14 has adhesive properties to adhere to the tab 112. Alternatively, an adhesive layer is provided between the heat-conducting element 14 and the tab 112 to achieve adhesion between them.

[0188] In this way, on the one hand, the tab 112 and the heat-conducting element 14 can make good contact, so that the heat on the tab 112 can be efficiently conducted to the heat-conducting element 14. On the other hand, during the assembly of the battery cell 1, the heat-conducting element 14 can be bonded to the tab 112 first, and then the electrode assembly 11 can be installed in the housing 12.

[0189] In some embodiments, please refer to Figures 8 and 9 together, and in conjunction with other figures. The thermally conductive element 14 is bonded to the end wall 1221.

[0190] The heat-conducting component 14 has adhesive properties to adhere to the end wall 1221. Alternatively, an adhesive layer is provided between the heat-conducting component 14 and the end wall 1221 to achieve adhesion between them.

[0191] In this way, on the one hand, the end wall 1221 and the heat-conducting element 14 can be in good contact, so that the heat on the heat-conducting element 14 can be efficiently conducted to the end wall 1221. On the other hand, during the assembly of the battery cell 1, the heat-conducting element 14 can be first bonded to the end wall 1221, and then the end cover 122 housing 12 containing the end wall 122 can be attached to the housing 121.

[0192] By adopting the above technical solution, on the one hand, the heat conduction between the tab 112 and the end cap 122 can be improved, thereby enhancing the heat dissipation effect of the tab 112 and reducing the temperature rise of the tab 112 and the main body 111. On the other hand, it facilitates the assembly of the battery cell 1.

[0193] In some embodiments, the thermally conductive element 14 includes a thermally conductive adhesive layer, which is bonded to the tab 112 and the end wall 1221.

[0194] By adopting the above technical solution, on the one hand, the heat-conducting component 14 has a high thermal conductivity and better insulation performance, and on the other hand, it facilitates the assembly of the battery cell 1.

[0195] In some embodiments, the material of the heat-conducting component 14 includes at least one of silicone sealant, resin, and phase change material.

[0196] The resin may include at least one of aluminum nitride, boron nitride, and silicon nitride.

[0197] This configuration gives the heat-conducting component 14 better thermal conductivity and insulation properties.

[0198] In some embodiments, the thermal conductivity of the heat-conducting element 14 is ≥0.5W / (m·k).

[0199] The thermal conductivity of the heat-conducting component 14 can be 0.5 W / (m·k), 0.6 W / (m·k), 0.7 W / (m·k), 0.8 W / (m·k), 0.9 W / (m·k), 1 W / (m·k), 1.1 W / (m·k), 1.2 W / (m·k), 1.3 W / (m·k), 1.4 W / (m·k), 1.5 W / (m·k), 1.6 W / (m·k), 1.7 W / (m·k), 1.8 W / (m·k), 1.9 W / (m·k), 2 W / (m·k), 2.5 W / (m·k), 3 W / (m·k), etc.

[0200] This configuration gives the heat-conducting component 14 high thermal conductivity, which helps to improve the heat dissipation of the tab 112 and reduce the temperature rise of the tab 112 and the main body 111.

[0201] In some embodiments, the thermal conductivity of the heat-conducting element 14 is ≥1 W / (m·k).

[0202] The thermal conductivity of the heat-conducting component 14 can be 1 W / (m·k), 1.1 W / (m·k), 1.2 W / (m·k), 1.3 W / (m·k), 1.4 W / (m·k), 1.5 W / (m·k), 1.6 W / (m·k), 1.7 W / (m·k), 1.8 W / (m·k), 1.9 W / (m·k), 2 W / (m·k), 2.5 W / (m·k), 3 W / (m·k), etc.

[0203] This configuration gives the heat-conducting component 14 high thermal conductivity, which helps to improve the heat dissipation of the tab 112 and reduce the temperature rise of the tab 112 and the main body 111.

[0204] In some embodiments, please refer to Figures 9 to 12 together, and in conjunction with other figures. The insulating member 13 has a mounting hole 1302 along the first direction Z, and the mounting hole 1302 and the clearance hole 1301 are arranged along the second direction Y. The battery cell 1 also includes an electrode terminal 15, which is mounted on the end wall 1221, and a portion of the electrode terminal 15 is disposed within the mounting hole 1302. In the second direction Y, the tab 112 extends beyond the clearance hole 1301 towards the mounting hole 1302 to be electrically connected to the electrode terminal 15. The first direction Z intersects the second direction Y.

[0205] The insulating member 13 is provided with a mounting hole 1302 along the first direction Z, which means that the insulating member 13 is provided with a through mounting hole 1302 along the first direction Z. Among them, the mounting hole 1302 and the clearance hole 1301 are through holes spaced apart on the insulating member 13.

[0206] The electrode terminal 15 is partially disposed within the mounting hole 1302, meaning that the electrode terminal 15 passes through the mounting hole 1302 along the first direction Z. In this way, the electrode terminal 15 can be exposed on the side of the insulating member 13 closer to the electrode assembly 11 along the first direction Z, thereby allowing the electrode terminal 15 to be electrically connected to the tab 112. The electrode terminal 15 and the tab 112 can be electrically connected, but are not limited to, by soldering.

[0207] In the second direction Y, the tab 112 extends beyond the clearance hole 1301 towards the mounting hole 1302, meaning that a portion of the tab 112 along the second direction Y is positioned opposite the clearance hole 1301 along the first direction Z, so that the heat-conducting element 14 can be disposed between this portion of the tab 112 and the end wall 1221; another portion of the tab 112 along the second direction Y is positioned opposite the mounting hole 1302 along the first direction Z, so that this portion of the tab 112 can be electrically connected to the electrode terminal 15.

[0208] The intersection of the first direction Z and the second direction Y means that the first direction Z and the second direction Y can form an angle greater than 0° and less than 180°, that is, the first direction Z and the second direction Y are not parallel. The first direction Z and the second direction Y can be perpendicular to each other or not perpendicular. The first direction Z and the second direction Y can be intersecting directions located on the same plane, or they can be directions on skew planes, and the projection of the second direction Y onto the plane containing the first direction Z can intersect the first direction Z.

[0209] Wherein, the second direction Y is the approximate distribution direction of the mounting hole 1302 and the clearance hole 1301. As an example, the first direction Z and the second direction Y are perpendicular.

[0210] This configuration allows the tab 112 to be electrically connected to the electrode terminal 15 and to be in contact with the heat-conducting element 14 while facing the clearance hole 1301.

[0211] It should be further noted that when the tab 112 includes a positive tab, the electrode terminal 15 includes a positive electrode terminal 15a, and the mounting hole 1302 includes a first mounting hole 1302a. The first mounting hole 1302a and the first clearance hole 1301a are distributed along the second direction Y. The positive electrode terminal 15a passes through the first mounting hole 1302a along the first direction Z. The positive tab extends beyond the first clearance hole 1301a along the second direction Y toward the first mounting hole 1302a to be electrically connected to the positive electrode terminal 15a.

[0212] When the tab 112 includes a negative tab, the electrode terminal 15 includes a negative electrode terminal 15b, and the mounting hole 1302 includes a second mounting hole 1302b. The second mounting hole 1302b and the second clearance hole 1301b are distributed along the second direction Y. The negative electrode terminal 15b passes through the second mounting hole 1302b along the first direction Z. The negative tab extends beyond the second clearance hole 1301b along the second direction Y toward the second mounting hole 1302b to be electrically connected to the negative electrode terminal 15b.

[0213] In some embodiments, please refer to Figures 9 through 12 together with other figures. In the second direction Y, the clearance hole 1301 penetrates the side of the insulating member 13 away from the mounting hole 1302.

[0214] Understandably, the clearance hole 1301 penetrates the side of the insulating member 13 away from the mounting hole 1302 along the second direction Y.

[0215] This configuration allows the clearance hole 1301 to have a larger size in the second direction Y, which in turn allows the heat-conducting element 14 to have a larger size in the second direction Y. This helps to increase the contact area between the heat-conducting element 14 and the tab 112, as well as the contact area between the heat-conducting element 14 and the end wall 1221, thereby improving the heat conduction effect between the tab 112 and the end wall 1221, improving the heat dissipation effect of the tab 112, and reducing the temperature rise of the tab 112.

[0216] In the second direction Y, the first clearance hole 1301a can penetrate the side of the insulating member 13 away from the first mounting hole 1302a. In the second direction Y, the second clearance hole 1301b can penetrate the side of the insulating member 13 away from the second mounting hole 1302b.

[0217] In some embodiments, please refer to Figures 9 to 12 together with other figures. The size of the clearance hole 1301 in the third direction X is greater than or equal to the size of the portion of the tab 112 relative to the clearance hole 1301 in the third direction X. The third direction X intersects with the first direction Z, and the third direction X intersects with the second direction Y.

[0218] The dimension of the clearance hole 1301 in the third direction X is W1, and the dimension of the portion of the tab 112 relative to the clearance hole 1301 in the third direction X is W2, where W1 ≥ W2.

[0219] The meanings of the intersection of the third direction X and the first direction Z, and the intersection of the third direction X and the second direction Y, can be explained in the same way as the intersection of the first direction Z and the second direction Y, and will not be repeated here. As an example, the first direction Z is perpendicular to the second direction Y, the first direction Z is perpendicular to the third direction X, and the second direction Y is perpendicular to the third direction X.

[0220] In some cases, the battery cell 1 is approximately cubic in shape. The first direction Z can be the length or height direction of the battery cell 1, the second direction Y can be the thickness direction of the battery cell 1, and the third direction X can be the width direction of the battery cell 1.

[0221] This configuration allows the clearance hole 1301 to have a larger size in the third direction X, which in turn allows the heat conductor 14 to have a larger size in the third direction X. This helps to increase the contact area between the heat conductor 14 and the tab 112, as well as the contact area between the heat conductor 14 and the end wall 1221, thereby improving the heat conduction effect between the tab 112 and the end wall 1221, improving the heat dissipation effect of the tab 112, and reducing the temperature rise of the tab 112.

[0222] Wherein, the size of the first clearance hole 1301a in the third direction X can be greater than or equal to the size of the portion of the positive electrode tab relative to the first clearance hole 1301a in the third direction X, and the size of the second clearance hole 1301b in the third direction X can be greater than or equal to the size of the portion of the negative electrode tab relative to the second clearance hole 1301b in the third direction X.

[0223] In some other embodiments, the battery cell 1 may be generally cylindrical, with the first direction Z being the axial direction of the battery cell 1.

[0224] In some embodiments, please refer to Figures 9 through 12 together with other figures. In the third direction X, the clearance hole 1301 extends beyond at least one side of the tab 112.

[0225] In some possible designs, W1 ≥ W2, and the clearance hole 1301 extends beyond the tab 112 on opposite sides along the third direction X. Alternatively, in other possible designs, the clearance hole 1301 extends beyond one side of the tab 112 along the third direction X.

[0226] This configuration allows the heat-conducting element 14 to have a larger size in the third direction X, which helps to increase the contact area between the heat-conducting element 14 and the tab 112, and the contact area between the heat-conducting element 14 and the end wall 1221. This improves the heat conduction effect between the tab 112 and the end wall 1221, thereby improving the heat dissipation effect of the tab 112 and reducing the temperature rise of the tab 112.

[0227] In the third direction X, the first clearance hole 1301a may extend beyond at least one side of the positive electrode tab. In the third direction X, the second clearance hole 1301b may extend beyond at least one side of the negative electrode tab.

[0228] In some embodiments, please refer to Figures 9 to 12 together, and in conjunction with other figures. The mounting hole 1302 is provided with clearance holes 1301 on both sides along the second direction Y, and each clearance hole 1301 is provided with a heat-conducting element 14, and each heat-conducting element 14 is disposed between the tab 112 and the end wall 1221.

[0229] Both sides of the mounting hole 1302 along the second direction Y are provided with clearance holes 1301, and each clearance hole 1301 is provided with a heat-conducting element 14, which helps to increase the contact area between the tab 112 and the heat-conducting element 14, and the contact area between the end wall 1221 and the heat-conducting element 14. This helps to improve the heat conduction effect between the tab 112 and the end wall 1221, thereby improving the heat dissipation effect of the tab 112 and reducing the temperature rise of the tab 112.

[0230] The first mounting hole 1302a may be provided with first clearance holes 1301a on both sides along the second direction Y. Each first clearance hole 1301a is provided with a first heat conduction element 14a, and each first heat conduction element 14a is disposed between the positive electrode tab and the end wall 1221.

[0231] The second mounting hole 1302b can be provided with a second clearance hole 1301b on both sides along the second direction Y. Each second clearance hole 1301b is provided with a second heat conduction element 14b, and each second heat conduction element 14b is disposed between the negative electrode tab and the end wall 1221.

[0232] In some embodiments, please refer to Figures 9 to 13 together with other figures. There are multiple electrode assemblies 11, and the tabs 112 of the multiple electrode assemblies 11 include a first tab portion 1121 and a second tab portion 1122, and the first tab portion 1121 and the second tab portion 1122 have the same polarity.

[0233] Understandably, the overall structure of all tabs 112 with the same polarity among the multiple electrode assemblies 11 can be divided into two parts, namely the first tab 1121 and the second tab 1122.

[0234] The polarity of the first electrode ear 1121 and the second electrode ear 1122 can be either positive or negative.

[0235] It should be noted that when the tab 112 includes a positive tab, the polarity of the first tab portion 1121 and the second tab portion 1122 can be positive. The overall structure formed by all the positive tabs of the multiple electrode assemblies 11 can be divided into two parts, namely the first tab portion 1121 and the second tab portion 1122. As an example, as shown in Figures 6 to 13, there are two electrode assemblies 11, and each electrode assembly 11 includes one positive tab. Of the two positive tabs of the two electrode assemblies 11, one positive tab constitutes the first tab portion 1121, and the other positive tab constitutes the second tab portion 1122.

[0236] It should also be noted that when the tab 112 includes a negative tab, the polarity of the first tab portion 1121 and the second tab portion 1122 can be negative. The overall structure formed by all the negative tabs of the multiple electrode assemblies 11 can be divided into two parts, namely the first tab portion 1121 and the second tab portion 1122. As an example, as shown in Figures 6 to 13, there are two electrode assemblies 11, and each electrode assembly 11 includes one negative tab. Of the two negative tabs of the two electrode assemblies 11, one negative tab constitutes the first tab portion 1121, and the other negative tab constitutes the second tab portion 1122.

[0237] Understandably, the positive electrode tabs of the plurality of electrode assemblies 11 may include a first electrode tab portion 1121 and a second electrode tab portion 1122 with the same polarity, and the negative electrode tabs of the plurality of electrode assemblies 11 may also include a first electrode tab portion 1121 and a second electrode tab portion 1122 with the same polarity.

[0238] In some embodiments, the number of electrode assemblies 11 is one, and the electrode tabs 112 of the electrode assembly 11 include a first electrode tab 1121 and a second electrode tab 1122, and the first electrode tab 1121 and the second electrode tab 1122 have the same polarity.

[0239] The polarity of the first electrode ear 1121 and the second electrode ear 1122 can be either positive or negative.

[0240] Understandably, the overall structure of the electrode assembly 11, which consists of all the tabs 112 of the same polarity, can be divided into two parts, namely the first tab 1121 and the second tab 1122.

[0241] As an example, the electrode assembly 11 includes a positive electrode tab and a negative electrode tab. The positive electrode tab can be divided into two parts: a first electrode tab 1121 and a second electrode tab 1122, both of which are positively polarized. Similarly, the negative electrode tab can also be divided into two parts: a first electrode tab 1121 and a second electrode tab 1122, both of which are negatively polarized.

[0242] As another example, the electrode assembly 11 includes multiple positive electrode tabs and multiple negative electrode tabs. The overall structure consisting of the multiple positive electrode tabs can be divided into two parts: a first electrode tab 1121 and a second electrode tab 1122, both of which are positively polarized. Similarly, the overall structure consisting of the multiple negative electrode tabs can also be divided into two parts: a first electrode tab 1121 and a second electrode tab 1122, both of which are negatively polarized.

[0243] Understandably, the positive electrode tab of the electrode assembly 11 may include a first electrode tab portion 1121 and a second electrode tab portion 1122, and the negative electrode tab of the electrode assembly 11 may also include a first electrode tab portion 1121 and a second electrode tab portion 1122.

[0244] In some embodiments, please refer to Figures 9 to 13 together, and in conjunction with other figures. The first electrode tab 1121 and the second electrode tab 1122 are respectively disposed opposite to the clearance holes 1301 on both sides of the mounting hole 1302 along the second direction Y. In one of the clearance holes 1301 on both sides of the mounting hole 1302 along the second direction Y, a heat-conducting element 14 is disposed between the first electrode tab 1121 and the end wall 1221, and the heat-conducting element 14 is disposed between the second electrode tab 1122 and the end wall 1221 in the other clearance hole 1301. Both the first electrode tab 1121 and the second electrode tab 1122 are electrically connected to the electrode terminal 15.

[0245] It should be noted that when the polarity of the first electrode tab 1121 and the second electrode tab 1122 is positive, in the first clearance holes 1301a on both sides of the first mounting hole 1302a along the second direction Y, one of the first clearance holes 1301a and the first electrode tab 1121 are arranged opposite each other along the first direction Z, and the other first clearance hole 1301a and the second electrode tab 1122 are arranged opposite each other along the first direction Z. In the first clearance holes 1301a on both sides of the first mounting hole 1302a along the second direction Y, the first heat-conducting element 14a in one of the first clearance holes 1301a is disposed between the first electrode tab 1121 and the end wall 1221, and the first heat-conducting element 14a in the other first clearance hole 1301a is disposed between the second electrode tab 1122 and the end wall 1221. Furthermore, both the first electrode tab 1121 and the second electrode tab 1122 are electrically connected to the positive electrode terminal 15a.

[0246] When the polarity of the first electrode lug 1121 and the second electrode lug 1122 is negative, in the second clearance holes 1301b on both sides of the second mounting hole 1302b along the second direction Y, one of the second clearance holes 1301b is disposed opposite to the first electrode lug 1121 along the first direction Z, and the other second clearance hole 1301b is disposed opposite to the second electrode lug 1122 along the first direction Z. In the second clearance holes 1301b on both sides of the second mounting hole 1302b along the second direction Y, the second heat-conducting element 14b in one of the second clearance holes 1301b is disposed between the first electrode lug 1121 and the end wall 1221, and the second heat-conducting element 14b in the other second clearance hole 1301b is disposed between the second electrode lug 1122 and the end wall 1221. Furthermore, both the first electrode lug 1121 and the second electrode lug 1122 are electrically connected to the negative electrode terminal 15b.

[0247] Understandably, the first electrode tab 1121 and the second electrode tab 1122 are distributed approximately along the second direction Y. That is, the first electrode tab 1121 and the second electrode tab 1122 of the positive electrode tab are distributed approximately along the second direction Y, and the first electrode tab 1121 and the second electrode tab 1122 of the negative electrode tab are also distributed approximately along the second direction Y. When there are multiple electrode assemblies 11, the main body portions 111 of the multiple electrode assemblies 11 are also distributed approximately along the second direction Y.

[0248] By adopting the above technical solution, heat-conducting elements 14 can be provided between the first tab 1121 and the end wall 1221, and between the second tab 1122 and the end wall 1221. That is, both parts of the tab 112 can contact the heat-conducting elements 14, which increases the number of heat-conducting elements 14 and the contact area between the tab 112 and the heat-conducting elements 14, as well as the contact area between the end wall 1221 and the heat-conducting elements 14. This is beneficial to improve the heat conduction effect between the tab 112 and the end wall 1221, thereby improving the heat dissipation effect of the tab 112 and reducing the temperature rise of the tab 112.

[0249] In some embodiments, please refer to Figures 6 to 12 together, and in conjunction with other figures. There are two electrode assemblies 11. In the two electrode assemblies 11, the tab 112 of one electrode assembly 11 includes a first tab portion 1121, and the tab 112 of the other electrode assembly 11 includes a second tab portion 1122.

[0250] It should be noted that when the tab 112 includes a positive tab, the polarity of the first tab portion 1121 and the second tab portion 1122 can be positive. In the two electrode assemblies 11, the positive tab of one electrode assembly 11 is the first tab portion 1121, and the positive tab of the other electrode assembly 11 is the second tab portion 1122.

[0251] When the tab 112 includes a negative tab, the polarity of the first tab portion 1121 and the second tab portion 1122 can be negative. In the two electrode assemblies 11, the negative tab of one electrode assembly 11 is the first tab portion 1121, and the negative tab of the other electrode assembly 11 is the second tab portion 1122.

[0252] This configuration allows the tab 112 to be divided into a first tab portion 1121 and a second tab portion 1122, thereby increasing the contact area between the tab 112 and the heat-conducting element 14, and the contact area between the end wall 1221 and the heat-conducting element 14.

[0253] In some embodiments, please refer to Figures 9 to 12 together, and in conjunction with other figures. Mounting holes 1302 and clearance holes 1301 are provided at intervals along the second direction Y.

[0254] Understandably, the insulating member 13 has a retaining portion 131 between the mounting hole 1302 and the clearance hole 1301. As shown in Figures 9 to 11, the retaining portion 131 can surround the outer periphery of the mounting hole 1302 so that the mounting hole 1302 and the clearance hole 1301 are spaced apart.

[0255] This design allows the enclosure 131 to provide protection for the electrode terminals 15 inside the mounting holes 1302.

[0256] In some embodiments, please refer to Figures 6 to 13 together, and in conjunction with other figures. The tab 112 includes a first tab 112a and a second tab 112b with different polarities. The clearance hole 1301 includes a first clearance hole 1301a and a second clearance hole 1301b, both of which are provided with a heat-conducting element 14. In the first direction Z, the first clearance hole 1301a is disposed opposite to the first tab 112a, and the heat-conducting element 14 in the first clearance hole 1301a is disposed between the end wall 1221 and the first tab 112a. In the first direction Z, the second clearance hole 1301b is disposed opposite to the second tab 112b, and the heat-conducting element 14 in the second clearance hole 1301b is disposed between the end wall 1221 and the second tab 112b.

[0257] Specifically, the heat-conducting element 14 in the first clearance hole 1301a is the first heat-conducting element 14a, and the heat-conducting element 14 in the second clearance hole 1301b is the second heat-conducting element 14b. In the first direction Z, the first heat-conducting element 14a is disposed between the first electrode tab 112a and the end wall 1221, and the second heat-conducting element 14b is disposed between the second electrode tab 112b and the end wall 1221.

[0258] Among them, the first electrode 112a can be a positive electrode, and the second electrode 112b can be a negative electrode.

[0259] The first electrode 112a may include the first electrode portion 1121 and the second electrode portion 1122, and the second electrode 112b may also include the first electrode portion 1121 and the second electrode portion 1122.

[0260] By adopting the above technical solution, heat-conducting components 14 are provided between the positive electrode tab and the end wall 1221, and between the negative electrode tab and the end wall 1221. This can improve the problem of local temperature rise of the main body 111 of the electrode assembly 11 exceeding the temperature threshold, which helps to improve the overcurrent capacity of the battery cell 1, thereby helping to improve the performance of the battery cell 1 and extend the service life of the battery cell 1.

[0261] In some embodiments, please refer to Figures 6 to 12 together, and in conjunction with other figures. The housing 12 has an end wall 1221 at one end along the first direction Z, the first tab 112a and the second tab 112b are spaced apart along the third direction X, and the first clearance hole 1301a and the second clearance hole 1301b are arranged along the third direction X.

[0262] Understandably, the first tab 112a and the second tab 112b are disposed at one end of the main body 111 of the electrode assembly 11 along the first direction Z, specifically at the end of the main body 111 along the first direction Z near the end wall 1221.

[0263] Positive electrode terminal 15a and negative electrode terminal 15b are disposed at one end of the housing 12 along the first direction Z, specifically on the end wall 1221 of the housing 12 along the first direction Z. The positive electrode terminal 15a and negative electrode terminal 15b are spaced apart along the third direction X.

[0264] In the first direction Z, an insulating member 13 is disposed between the end wall 1221 and the electrode assembly 11, and the insulating member 13 has a first clearance hole 1301a and a second clearance hole 1301b. The insulating member 13 also has a first mounting hole 1302a and a second mounting hole 1302b, which are spaced apart along the third direction X. A portion of the positive electrode terminal 15a is disposed in the first mounting hole 1302a and is electrically connected to the first tab 112a. A portion of the negative electrode terminal 15b is disposed in the second mounting hole 1302b and is electrically connected to the second tab 112b.

[0265] By adopting the above technical solution, the first tab 112a and the second tab 112b are disposed at one end of the main body 111 of the electrode assembly 11 along the first direction Z, and the heat on the first tab 112a and the second tab 112b can be conducted to the same end wall 1221 through the corresponding heat-conducting element 14.

[0266] As an example, as shown in Figures 6 to 12, the outer casing 12 includes a housing 121 and an end cap 122. The end cap 122 is disposed at one end of the housing 121 along the first direction Z, and the end wall 1221 is disposed on the end cap 122.

[0267] In some embodiments, please refer to FIG13 and other figures. In the first direction Z, both ends of the housing 12 are provided with end walls 1221, and the end walls 1221 at both ends of the housing 12 are respectively a first end wall 1221a and a second end wall 1221b. The insulating member 13 includes a first insulating member 13a and a second insulating member 13b. In the first direction Z, the first insulating member 13a is disposed between the electrode assembly 11 and the first end wall 1221a, and the second insulating member 13b is disposed between the electrode assembly 11 and the second end wall 1221b. Both the first insulating member 13a and the second insulating member 13b are provided with clearance holes 1301. The clearance hole 1301 on the first insulating member 13a is the first clearance hole 1301a, and the clearance hole 1301 on the second insulating member 13b is the second clearance hole 1301b. In the first direction Z, the first tab 112a is disposed at one end of the electrode assembly 11 near the first end wall 1221a, and the second tab 112b is disposed at one end of the electrode assembly 11 near the second end wall 1221b. The heat-conducting element 14 in the first clearance hole 1301a is disposed between the first end wall 1221a and the first tab 112a, and the heat-conducting element 14 in the second clearance hole 1301b is disposed between the second end wall 1221b and the second tab 112b.

[0268] The first end wall 1221a and the second end wall 1221b are disposed opposite to each other along the first direction Z. Based on this, the first clearance hole 1301a and the second clearance hole 1301b are distributed along the first direction Z.

[0269] The first insulating member 13a is provided with the aforementioned first mounting hole 1302a, and the second insulating member 13b is provided with the aforementioned second mounting hole 1302b. The first mounting hole 1302a and the second mounting hole 1302b are distributed along the first direction Z.

[0270] In the first direction Z, the first tab 112a is disposed at one end of the electrode assembly 11 near the first end wall 1221a, and the second tab 112b is disposed at one end of the electrode assembly 11 near the second end wall 1221b. Specifically, the first tab 112a is disposed at one end of the main body 111 near the first end wall 1221a, and the second tab 112b is disposed at one end of the main body 111 near the second end wall 1221b.

[0271] The heat-conducting element 14 in the first clearance hole 1301a is a first heat-conducting element 14a, which is disposed between the first electrode tab 112a and the first end wall 1221a along the first direction Z. The heat-conducting element 14 in the second clearance hole 1301b is a second heat-conducting element 14b, which is disposed between the second electrode tab 112b and the second end wall 1221b along the first direction Z.

[0272] Understandably, the positive electrode terminal 15a and the negative electrode terminal 15b are respectively located at opposite ends of the housing 12 along the first direction Z. Specifically, the positive electrode terminal 15a is located on the first end wall 1221a, and the negative electrode terminal 15b is located on the second end wall 1221b.

[0273] By adopting the above technical solution, the first tab 112a and the second tab 112b are respectively disposed at opposite ends of the main body 111 along the first direction Z, and the heat on the first tab 112a and the second tab 112b can be conducted to different end walls 1221 through the corresponding heat-conducting elements 14.

[0274] As an example, as shown in Figure 13, the outer casing 12 includes a housing 121 and two end caps 122. The two end caps 122 are respectively disposed at opposite ends of the housing 121 along the first direction Z. A first end wall 1221a is disposed on one of the end caps 122, and a second end wall 1221b is disposed on the other end cap 122.

[0275] In some embodiments, please refer to Figures 8 and 9 together, and in conjunction with other figures. The housing 12 also includes a sidewall 1211 connected to the end wall 1221 and disposed around the outer periphery of the electrode assembly 11. A heat-conducting element 14 is disposed on the sidewall 1211.

[0276] The heat-conducting element 14 can be disposed on the side wall 1211 of the outer shell 12 along the second direction Y, as shown in Figure 9; the heat-conducting element 14 can also be disposed on the side wall 1211 of the outer shell 12 along the third direction X.

[0277] By adopting the above technical solution, the heat-conducting component 14 can conduct the heat on the tab 112 to the side wall 1211 of the outer shell 12 and release it through the side wall 1211. This helps to improve the heat dissipation effect of the tab 112 and reduce the temperature rise of the tab 112.

[0278] As an example, as shown in Figures 8 and 9, the housing 12 includes a housing 121 and an end cap 122, with an end wall 1221 disposed on the end cap 122, and the housing 121 including the aforementioned side wall 1211.

[0279] In some embodiments, please refer to Figures 6, 8, and 9 together with other figures. The battery cell 1 also includes an insulating film 16 disposed within the housing 12 and at least surrounding the outer periphery of the electrode assembly 11. At least a portion of the heat-conducting element 14 is disposed between the tab 112 and the insulating film 16.

[0280] The insulating film 16 may be, but is not limited to, a Mylar film.

[0281] By having at least a portion of the heat-conducting element 14 disposed between the tab 112 and the insulating film 16, the tab 112 can also be provided with the heat-conducting element 14 at the position opposite to the insulating film 16. This increases the contact area between the tab 112 and the heat-conducting element 14, which helps to improve the heat dissipation effect of the tab 112 and thus reduces the temperature rise of the tab 112.

[0282] In some embodiments, please refer to Figures 5 to 13 together with other figures. The housing 12 includes a housing 121 and an end cap 122. The end cap 122 is mounted on at least one end of the housing 121 along a first direction Z. The electrode assembly 11 is disposed within the space formed by the housing 121 and the end cap 122, and the end cap 122 includes an end wall 1221.

[0283] As shown in Figures 5 to 12, the housing 121 has an end cap 122 at one end along the first direction Z, and the end cap 122 includes an end wall 1221. Alternatively, as shown in Figure 13, the housing 121 has end caps 122 at both opposite ends along the first direction Z, and both end caps 122 have end walls 1221.

[0284] By adopting the above technical solution, the heat-conducting element 14 can be first disposed on at least one of the end wall 1221 of the end cover 122 and the tab 112, then the electrode assembly 11 can be installed inside the housing 121, and finally the end cover 122 can be installed on the housing 121, thus realizing that the heat-conducting element 14 is disposed between the tab 112 and the end wall 1221. In this way, it is convenient to assemble the battery cell 1.

[0285] Please refer to Figure 14 and other accompanying drawings. The processing method for battery cell 1 provided in this application embodiment is applied to battery cell 1. The battery cell 1 in this embodiment is the same as the battery cell 1 in the above embodiments; please refer to the relevant descriptions of the battery cell 1 in the above embodiments for details, which will not be repeated here.

[0286] The processing method of the battery cell 1 provided in this application includes the following steps:

[0287] S10. A heat-conducting element 14 is provided on at least one of the tab 112 and the end wall 1221.

[0288] In this step, a heat-conducting element 14 can be provided on the side of the tab 112 close to the end wall 1221 along the first direction Z, or a heat-conducting element 14 can be provided on the side of the end wall 1221 close to the tab 112 along the first direction Z.

[0289] In this step, a heat-conducting element 14 can be provided on the positive electrode tab or on the end wall 1221 opposite to the positive electrode tab. A heat-conducting element 14 can be provided on the negative electrode tab or on the end wall 1221 opposite to the negative electrode tab.

[0290] S20. The electrode assembly 11 and the insulating member 13 are installed in the housing 12 so that the heat-conducting member 14 is disposed between the tab 112 and the end wall 1221, and is at least partially disposed in the clearance hole 1301 of the insulating member 13.

[0291] In step S10, the approximate location of the heat-conducting element 14 has been determined.

[0292] In this step, after the electrode assembly 11 and the insulating member 13 are installed inside the housing 12 and the battery cell 1 is assembled, the heat-conducting member 14 is also located inside the housing 12. Furthermore, based on the approximate position of the heat-conducting member 14 in step S10, at least a portion of the heat-conducting member 14 is now located within the clearance hole 1301 of the insulating member 13, and the heat-conducting member 14 is positioned along the first direction Z between the tab 112 and the end wall 1221.

[0293] The battery cell 1 processing method provided in this application embodiment has a clearance hole 1301 on the insulating member 13, and a heat-conducting member 14 is provided in the clearance hole 1301. The heat-conducting member 14 is disposed between the end wall 1221 and the tab 112 through the clearance hole 1301, and the thermal conductivity of the heat-conducting member 14 is greater than that of the insulating member 13. This allows the heat on the tab 112 to be directly and efficiently conducted to the end wall 1221 through the heat-conducting member 14, and then released through the outer casing 12. In this way, the heat dissipation effect of the tab 112 can be improved, which helps to reduce the temperature rise of the tab 112 and improve the problem of the temperature rise of the tab 112. This arrangement can reduce the risk of the local temperature of the main body 111 exceeding the temperature threshold, which helps to improve the overcurrent capacity of the battery cell 1, thereby helping to improve the performance of the battery cell 1 and extend the service life of the battery cell 1.

[0294] In some embodiments, step S10, which involves providing a heat-conducting element 14 on at least one of the tab 112 and the end wall 1221, includes the following steps:

[0295] S11. Attach the heat-conducting component 14 to the tab 112.

[0296] In this step, the heat-conducting component 14 can be bonded to the side of the tab 112 along the first direction Z near the end wall 1221.

[0297] In this step, the heat-conducting component 14 can be attached to either the positive electrode tab or the negative electrode tab.

[0298] In some embodiments, step S10, which involves providing a heat-conducting element 14 on at least one of the tab 112 and the end wall 1221, includes the following steps:

[0299] S12. Attach the heat-conducting component 14 to the end wall 1221 of the end cap 122.

[0300] In this step, the heat-conducting component 14 can be bonded to the side of the end wall 1221 along the first direction Z close to the tab 112.

[0301] In this step, the heat-conducting element 14 can be bonded to the end wall 1221 opposite to the positive electrode tab, or the heat-conducting element 14 can be bonded to the end wall 1221 opposite to the negative electrode tab.

[0302] By adopting the above technical solution, the step of providing a heat-conducting element 14 on at least one of the tab 112 and the end wall 1221, specifically by bonding the heat-conducting element 14, helps to improve the fixation reliability of the heat-conducting element 14, thereby facilitating the placement of the heat-conducting element 14 between the tab 112 and the end wall 1221 and reducing the temperature rise of the tab 112. Furthermore, it also facilitates the assembly of the battery cell 1.

[0303] In some embodiments, step S20, which involves installing the electrode assembly 11, the heat-conducting element 14, and the insulating element 13 within the housing 12, such that the heat-conducting element 14 is disposed between the tab 112 and the end wall 1221, and is at least partially disposed within the clearance hole 1301 of the insulating element 13, includes the following steps:

[0304] S21. Install the electrode assembly 11 inside the housing 121 of the outer casing 12;

[0305] S22. Install the insulating member 13 and the end cap 122 onto the housing 121, so that the heat-conducting member 14 is disposed between the tab 112 and the end wall 1221 of the end cap 122, and is at least partially disposed within the clearance hole 1301.

[0306] Understandably, end cap 122 includes end wall 1221.

[0307] In step S10, when the heat-conducting element 14 is disposed on the tab 112, in step S21, the heat-conducting element 14 can be installed in the housing 121 along with the electrode assembly 11.

[0308] In step S10, when the heat-conducting element 14 is disposed on the end wall 1221, in step S21, the heat-conducting element 14 is not yet installed inside the housing 121. In step 22, when the end cap 122 is installed on the housing 121, the heat-conducting element 14 is installed along with the end cap 122, so that it is located inside the housing 12, and the heat-conducting element 14 is disposed between the tab 112 and the end wall 1221.

[0309] By adopting the above technical solution, the end cap 122 includes the end wall 1221, which facilitates the assembly of the battery cell 1.

[0310] Please refer to Figure 4 and other accompanying drawings. The battery device 10 provided in this embodiment includes a battery cell 1. The battery cell 1 in this embodiment is the same as the battery cell 1 in the above embodiments; please refer to the relevant descriptions of the battery cell 1 in the above embodiments for details, which will not be repeated here.

[0311] The battery device 10 provided in this application adopts the battery cell 1 involved in the above embodiments, which helps to improve the overcurrent capacity of the battery cell 1, thereby improving the overcurrent capacity of the battery device 10, thus helping to improve the performance of the battery device 10 and extend the service life of the battery device 10, thereby improving the reliability of the battery device 10.

[0312] Please refer to Figure 3 and other accompanying drawings. The electrical device provided in this application embodiment includes a battery cell 1 or a battery device 10. The battery cell 1 and battery device 10 in this embodiment are the same as those in the above embodiments; please refer to the relevant descriptions of the battery cell 1 and battery device 10 in the above embodiments for details, which will not be repeated here.

[0313] The electrical device provided in this application embodiment, by employing the battery cell 1 or battery device 10 mentioned above, helps to improve the performance of the electrical device and extend its service life, thereby improving the reliability of the electrical device.

[0314] The energy storage device 100 provided in this application embodiment includes a battery cell 1 or a battery device 10. The battery cell 1 and battery device 10 in this embodiment are the same as those in the above embodiments; please refer to the relevant descriptions of the battery cell 1 and battery device 10 in the above embodiments for details, which will not be repeated here.

[0315] The energy storage device 100 provided in this application embodiment, by employing the battery cell 1 or battery device 10 mentioned above, can improve the performance of the energy storage device 100 and extend the service life of the energy storage device 100, thereby improving the reliability of the energy storage device 100.

[0316] Referring to Figure 1, the energy storage system 1000 provided in this embodiment includes a power conversion device 1100 and an energy storage device 100. The power conversion device 1100 is used to electrically connect the power generation device 1200 and the energy storage device 100. The energy storage device 100 in this embodiment is the same as the energy storage device 100 in the above embodiments; please refer to the relevant descriptions of the energy storage device 100 in the above embodiments for details, which will not be repeated here.

[0317] The energy storage system 1000 provided in this application embodiment, by adopting the energy storage device 100 involved in the above embodiments, helps to improve the performance of the energy storage system 1000 and extend the service life of the energy storage system 1000, thereby improving the reliability of the energy storage system 1000.

[0318] Referring to Figure 2, the charging network 2000 provided in this embodiment includes a charging pile 2100 and an energy storage device 100 or an energy storage system 1000. The energy storage device 100 is used to provide electrical energy to the charging pile 2100. The energy storage device 100 and energy storage system 1000 in this embodiment are the same as those in the above embodiments. For details, please refer to the relevant descriptions of the energy storage device 100 and energy storage system 1000 in the above embodiments, which will not be repeated here.

[0319] The charging network 2000 provided in this application embodiment, by employing the energy storage device 100 or energy storage system 1000 involved in the above embodiments, helps to improve the performance of the charging network 2000 and extend the service life of the charging network 2000, thereby improving the reliability of the charging network 2000.

[0320] As one embodiment of this application, as shown in Figures 5 to 12, the battery cell 1 includes a housing 12, an electrode assembly 11, an insulator 13, a heat-conducting component 14, and electrode terminals 15. The electrode assembly 11, the insulator 13, and the heat-conducting component 14 are all disposed within the housing 12. The housing 12 has an end wall 1221 at one end along the first direction Z. The electrode assembly 11 has an insulator 13 at one end along the first direction Z near the end wall 1221. The insulator 13 is disposed between the electrode assembly 11 and the end wall 1221 along the first direction Z. The insulating component 13 is provided with a first mounting hole 1302a, a second mounting hole 1302b, a first clearance hole 1301a, and a second clearance hole 1301b along the first direction Z. The first mounting hole 1302a and the first clearance hole 1301a are spaced apart along the second direction Y. The second mounting hole 1302b and the second clearance hole 1301b are spaced apart along the second direction Y. The first mounting hole 1302a and the second mounting hole 1302b are spaced apart along the third direction X. The first clearance hole 1301a and the second clearance hole 1301b are spaced apart along the third direction X. The electrode assembly 11 includes a main body 111 and an electrode tab 112. The electrode tab 112 includes a first electrode tab 112a and a second electrode tab 112b. The first electrode tab 112a and the second electrode tab 112b are both located at the end of the main body 111 along the first direction Z near the end wall 1221, and the first electrode tab 112a and the second electrode tab 112b are spaced apart along the third direction X. The first electrode tab 112a is the positive electrode tab, and the second electrode tab 112b is the negative electrode tab. The electrode terminal 15 includes a positive electrode terminal 15a and a negative electrode terminal 15b, which are spaced apart on the end wall 1221 along a third direction X. A portion of the positive electrode terminal 15a is disposed within the first mounting hole 1302a and is electrically connected to the first electrode tab 112a. A portion of the negative electrode terminal 15b is disposed within the second mounting hole 1302b and is electrically connected to the second electrode tab 112b. The first electrode tab 112a and the first clearance hole 1301a are arranged opposite each other along a first direction Z. A heat-conducting element 14 is provided within the first clearance hole 1301a, and the heat-conducting element 14 within the first clearance hole 1301a is disposed between the first electrode tab 112a and the end wall 1221 along the first direction Z. The second tab 112b and the second clearance hole 1301b are arranged opposite to each other along the first direction Z. A heat-conducting element 14 is provided in the second clearance hole 1301b. The heat-conducting element 14 in the second clearance hole 1301b is arranged between the second tab 112b and the end wall 1221 along the first direction Z.

[0321] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell (1), wherein, include: The outer casing (12) has an end wall (1221) at at least one end along the first direction (Z); An electrode assembly (11) is at least partially disposed within the housing (12); the electrode assembly (11) includes tabs (112); An insulating member (13) is disposed between the end wall (1221) and the electrode assembly (11), and in the first direction (Z), the insulating member (13) is provided with a clearance hole (1301) opposite to the tab (112); A heat-conducting element (14) is at least partially disposed within the clearance hole (1301); in the first direction (Z), the heat-conducting element (14) is disposed between the end wall (1221) and the tab (112), and the thermal conductivity of the heat-conducting element (14) is greater than that of the insulating element (13).

2. The battery cell (1) according to claim 1, wherein, The heat-conducting component (14) is an insulating structure.

3. The battery cell (1) according to claim 1 or 2, wherein, The heat-conducting element (14) is bonded to the tab (112) and / or the end wall (1221).

4. The battery cell (1) according to claim 3, wherein, The thermally conductive component (14) includes a thermally conductive adhesive layer, which is bonded to the tab (112) and the end wall (1221).

5. The battery cell (1) according to any one of claims 1-4, wherein, The material of the heat-conducting component (14) includes at least one of silicone sealant, resin, and phase change material.

6. The battery cell (1) according to any one of claims 1-5, wherein, The thermal conductivity of the heat-conducting component (14) is ≥0.5W / (m·k).

7. The battery cell (1) according to claim 6, wherein, The thermal conductivity of the heat-conducting component (14) is ≥1W / (m·k).

8. The battery cell (1) according to any one of claims 1-7, wherein, The insulating member (13) is provided with a mounting hole (1302) along the first direction (Z), and the mounting hole (1302) and the clearance hole (1301) are arranged along the second direction (Y); the battery cell (1) further includes an electrode terminal (15), the electrode terminal (15) is mounted on the end wall (1221) and partially disposed in the mounting hole (1302); in the second direction (Y), the tab (112) extends beyond the clearance hole (1301) toward the mounting hole (1302) to be electrically connected to the electrode terminal (15); wherein, the first direction (Z) and the second direction (Y) intersect.

9. The battery cell (1) according to claim 8, wherein, In the second direction (Y), the clearance hole (1301) penetrates the side of the insulating member (13) away from the mounting hole (1302).

10. The battery cell (1) according to claim 8 or 9, wherein, The size of the clearance hole (1301) in the third direction (X) is greater than or equal to the size of the portion of the tab (112) relative to the clearance hole (1301) in the third direction (X); wherein the third direction (X) intersects the first direction (Z) and the second direction (Y) respectively.

11. The battery cell (1) according to claim 10, wherein, On the third direction (X), the clearance hole (1301) extends beyond at least one side of the tab (112).

12. The battery cell (1) according to any one of claims 8-11, wherein, The mounting hole (1302) is provided with clearance holes (1301) on both sides along the second direction (Y). Each clearance hole (1301) is provided with a heat-conducting element (14), and each heat-conducting element (14) is disposed between the tab (112) and the end wall (1221).

13. The battery cell (1) according to claim 12, wherein, The number of electrode components (11) is one, and the electrode tab (112) includes a first electrode tab portion (1121) and a second electrode tab portion (1122) with the same polarity; or, the number of electrode components (11) is multiple, and the electrode tabs (112) of multiple electrode components (11) include a first electrode tab portion (1121) and a second electrode tab portion (1122) with the same polarity; The first electrode tab (1121) and the second electrode tab (1122) are respectively disposed opposite to the clearance holes (1301) on both sides of the mounting hole (13020) along the second direction (Y). In the clearance holes (1301) on both sides of the mounting hole (1302) along the second direction (Y), the heat-conducting element (14) in one of the clearance holes (1301) is disposed between the first electrode tab (1121) and the end wall (1221), and the heat-conducting element (14) in the other clearance hole (1301) is disposed between the second electrode tab (1122) and the end wall (1221). Both the first electrode tab (1121) and the second electrode tab (1122) are electrically connected to the electrode terminal (15).

14. The battery cell (1) according to claim 13, wherein, The number of electrode assemblies (11) is two. In the two electrode assemblies (11), the tab (112) of one electrode assembly (11) includes a first tab portion (1121), and the tab (112) of the other electrode assembly (11) includes a second tab portion (1122).

15. The battery cell (1) according to any one of claims 8-14, wherein, The mounting hole (1302) and the clearance hole (1301) are spaced apart along the second direction (Y).

16. The battery cell (1) according to any one of claims 1-15, wherein, The tab (112) includes a first tab (112a) and a second tab (112b) with different polarities, and the clearance hole (1301) includes a first clearance hole (1301a) and a second clearance hole (1301b). The heat-conducting element (14) is provided in both the first clearance hole (1301a) and the second clearance hole (1301b). In the first direction (Z), the first clearance hole (1301a) is disposed opposite to the first electrode tab (112a), and the heat-conducting element (14) in the first clearance hole (1301a) is disposed between the end wall (1221) and the first electrode tab (112a); In the first direction (Z), the second clearance hole (1301b) is disposed opposite to the second electrode tab (112b), and the heat-conducting element (14) in the second clearance hole (1301b) is disposed between the end wall (1221) and the second electrode tab (112b).

17. The battery cell (1) according to claim 16, wherein, The outer casing (12) has an end wall (1221) at one end along the first direction (Z), the first tab (112a) and the second tab (112b) are spaced apart along the third direction (X), and the first clearance hole (1301a) and the second clearance hole (1301b) are arranged along the third direction (X).

18. The battery cell (1) according to claim 16, wherein, In the first direction (Z), both ends of the outer shell (12) are provided with end walls (1221), and the end walls (1221) at both ends of the outer shell (12) are a first end wall (1221a) and a second end wall (1221b), respectively. The insulating member (13) includes a first insulating member (13a) and a second insulating member (13b), and in the first direction (Z), the first insulating member (13a) is disposed between the electrode assembly (11) and the first end wall (1221a), and the second insulating member (13b) is disposed between the electrode assembly (11) and the second end wall (1221b); Both the first insulating member (13a) and the second insulating member (13b) are provided with the clearance hole (1301), the clearance hole (1301) on the first insulating member (13a) is the first clearance hole (1301a), and the clearance hole (1301) on the second insulating member (13b) is the second clearance hole (1301b); In the first direction (Z), the first tab (112a) is disposed at one end of the electrode assembly (11) near the first end wall (1221a), the second tab (112b) is disposed at one end of the electrode assembly (11) near the second end wall (1221b), the heat-conducting element (14) in the first clearance hole (1301a) is disposed between the first end wall (1221a) and the first tab (112a), and the heat-conducting element (14) in the second clearance hole (1301b) is disposed between the second end wall (1221b) and the second tab (112b).

19. The battery cell (1) according to any one of claims 1-18, wherein, The outer casing (12) further includes a side wall (1211) connected to the end wall (1221) and disposed around the outer periphery of the electrode assembly (11); the heat-conducting element (14) is disposed on the side wall (1221).

20. The battery cell (1) according to any one of claims 1-19, wherein, The battery cell (1) further includes an insulating film (16), which is disposed inside the housing (12) and at least surrounds the outer periphery of the electrode assembly (11); at least a portion of the heat-conducting element (14) is disposed between the tab (112) and the insulating film (16).

21. The battery cell (1) according to any one of claims 1-20, wherein, The outer casing (12) includes a housing (121) and an end cap (122). The end cap (122) is mounted on at least one end of the housing (121) along the first direction (Z). The electrode assembly (11) is disposed within the space formed by the housing (121) and the end cap (122), and the end cap (122) includes the end wall (1221).

22. A method for processing a battery cell (1), wherein, Applied to the battery cell (1) according to any one of claims 1-21; the processing method of the battery cell (1) includes: The heat-conducting element (14) is disposed on at least one of the tab (112) and the end wall (1221); The electrode assembly (11) and the insulating member (13) are installed inside the housing (12) such that the heat-conducting member (14) is disposed between the tab (112) and the end wall (1221), and is at least partially disposed within the clearance hole (1301) of the insulating member (13).

23. The method for processing a battery cell (1) according to claim 22, wherein, The provision of the heat-conducting element (14) on at least one of the tab (112) and the end wall (1221) includes: The heat-conducting element (14) is bonded to the tab (112); and / or the heat-conducting element (14) is bonded to the end wall (1221) of the end cap (122).

24. The method for processing the battery cell (1) according to claim 22 or 23, wherein, The step of mounting the electrode assembly (11), the heat-conducting element (14), and the insulating element (13) inside the housing (12), such that the heat-conducting element (14) is disposed between the tab (112) and the end wall (1221), and is at least partially disposed within the clearance hole (1301) of the insulating element (13), includes: The electrode assembly (11) is installed inside the housing (121) of the outer casing (12); The insulating element (13) and the end cap (122) are mounted on the housing (121) such that the heat-conducting element (14) is disposed between the tab (112) and the end wall (1221) of the end cap (122), and is at least partially disposed within the clearance hole (1301).

25. A battery device (10), wherein, Includes the battery cell (1) according to any one of claims 1-21.

26. An electrical appliance, wherein, It includes a battery cell (1) according to any one of claims 1-21; or, it includes a battery device (10) according to claim 25.

27. An energy storage device (100), wherein, It includes a battery cell (1) according to any one of claims 1-21; or, it includes a battery device (10) according to claim 25.

28. An energy storage system (1000), wherein, It includes a power conversion device (1100) and an energy storage device (100) according to claim 27, wherein the power conversion device (1100) is used to electrically connect the power generation device (1200) and the energy storage device (100).

29. A charging network (2000), wherein, It includes a charging pile (2100) and an energy storage device (100) according to claim 27 or an energy storage system (1000) according to claim 28, wherein the energy storage device (100) is used to provide electrical energy to the charging pile (2100).

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