Battery cells, devices, energy storage devices, systems, power using devices, and charging networks

Abstract

The application provides a battery monomer, a battery device, an energy storage device, an energy storage system, a power consumption device and a charging network. The battery monomer comprises a shell, an electrode assembly, an electrode terminal and a transition sheet; the electrode assembly comprises a main body part, and a tab is arranged on a first surface of the main body part; at least one transition sheet comprises at least two connection regions with different distances to the first surface, one of the connection regions is provided with a sub-connection area, and the sub-connection area is connected with the electrode terminal; the corresponding tab comprises at least two connection parts connected with the at least two connection regions respectively, and the thicknesses of the at least two connection parts are equal to the distances of the corresponding connection regions to the first surface. By arranging the tab with the at least two connection parts with different thicknesses, the overall length and cross-sectional area of the tab of the electrode assembly can be increased, and the current passing capacity can be improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and more specifically, relates to a battery cell, battery device, energy storage device, energy storage system, power consumption device and charging network. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In battery cells, adapter plates are typically used to connect the tabs to the electrode terminals. For battery cells using bent adapter plates, because the bent part of the adapter plate occupies some space, the tabs are located on one side of the bend, resulting in a shorter tab length and thus a weaker current carrying capacity of the battery cell. Utility Model Content

[0004] The purpose of this application is to provide a battery cell, battery device, energy storage device, energy storage system, power consumption device, and charging network to improve the problem of weak overcurrent capacity of battery cells using bent adapter plates in related technologies.

[0005] In a first aspect, embodiments of this application provide a single battery cell, comprising:

[0006] shell;

[0007] An electrode assembly is installed in a housing. The electrode assembly includes a main body, and a tab is provided on the first surface of the main body.

[0008] Electrode terminals are mounted on the housing;

[0009] Adapter plate, connecting electrode terminals to electrode tabs;

[0010] At least one adapter includes at least two connection areas at different distances from the first surface, one of the connection areas having a sub-connection area connected to an electrode terminal; the corresponding tab includes at least two connection portions respectively connected to the at least two connection areas, and the thickness of the at least two connection portions is equal to the distance from the corresponding connection area to the first surface.

[0011] In the technical solution of this application embodiment, by setting at least two connecting parts with different thicknesses on the electrode tab to adapt to the corresponding connecting area of ​​the connecting adapter piece, the overall length and cross-sectional area of ​​the electrode tab of the electrode assembly can be increased, thereby improving the current carrying capacity.

[0012] In some embodiments, at least two connecting portions include a first portion and a second portion connected to the first portion; at least two connecting regions include a first region and a second region connected to the first region, the first portion being connected to the first region, the second portion being connected to the second region, and the second region having a sub-connecting region.

[0013] The above technical solution involves setting the electrode tabs to be adjacent to the first and second parts, and setting the adapter pieces to be adjacent to the first and second regions, in order to facilitate processing and manufacturing.

[0014] In some embodiments, the distance from the first region to the first surface is greater than the distance from the second region to the first surface, and correspondingly, the thickness of the first portion is greater than the thickness of the second portion.

[0015] With the above technical solution, since the second region needs to be connected to the electrode terminal, it will occupy the overall space of the second region. By setting the distance from the first region to the first surface to be larger, the thickness of the first part corresponding to the first region can be set to be larger. Correspondingly, the cross-sectional area of ​​the electrode tab can be set to be larger, so as to improve the current carrying capacity of the electrode assembly. Moreover, the distance from the electrode terminal to the first surface can be reduced, thereby reducing the overall height of the battery cell and improving the space utilization and volumetric energy density of the battery cell.

[0016] In some embodiments, the electrode tab includes multiple layers of sub-electrodes stacked on top of each other, with each sub-electrode layer having the same thickness.

[0017] The above technical solution makes it easy to determine the number of sub-electrode layers in the first part and the number of sub-electrode layers in the second part, which facilitates the setting and manufacturing of the electrodes.

[0018] In some embodiments, the multilayer sub-tab includes a first sub-tab and a second sub-tab, with one side of the first sub-tab aligned with one side of the second sub-tab to form a first portion, and the other side of the first sub-tab extending out of the second sub-tab to form a second portion.

[0019] The above technical solution uses a first sub-electrode to extend a second sub-electrode to form a second part, which is convenient for manufacturing.

[0020] In some embodiments, each first sub-electrode is disposed on the side of the second sub-electrode away from the first surface, or each first sub-electrode is disposed on the side of the second sub-electrode close to the first surface.

[0021] The above technical solution facilitates the setting of the first sub-electrode position and also makes the overall processing and manufacturing of the electrode easier.

[0022] In some embodiments, the distance from the first region to the first surface is A, the distance from the second region to the first surface is B, the thickness of each sub-tab is C, the first sub-tab is a B / C layer, and the second sub-tab is a (AB) / C layer.

[0023] By setting the first sub-tab as a B / C layer through the above technical solution, it is convenient to process and manufacture the entire tab, so as to form the first part and the second part.

[0024] In some embodiments, the electrode tab includes multiple layers of sub-electrodes stacked on the arrangement, at least some of the sub-electrodes having cutouts so that the portions of the stacked multiple layers of sub-electrodes corresponding to the second region form a second portion.

[0025] The above technical solution reduces the thickness of some sub-tabs by setting slits on them. By combining slits on multiple sub-tabs, a second part with a smaller thickness can be formed. In addition, the slit design allows for longer lengths of more sub-tab layers, thereby improving their current carrying capacity.

[0026] In some embodiments, at least part of the cutout is misaligned along the thickness direction of the sub-electrode tab.

[0027] By using the above technical solution, at least some of the cuts are misaligned in the thickness direction, allowing cuts to be set on more sub-tabs, so that the length of more layers of sub-tabs can be set to be larger, thereby improving their current carrying capacity.

[0028] In some embodiments, at least some cuts are arranged adjacent to each other along the length direction of the sub-electrode tab.

[0029] The above technical solution makes it easy to determine the location of the cuts on each sub-tab and to determine the thickness of each connecting part that forms the whole tab.

[0030] In some embodiments, the dimensions of each cut are equal along the length of the sub-electrode tab.

[0031] By using the above technical solution, the size of each cut is set to be equal, which facilitates the design and manufacturing of the cuts, and in turn facilitates the overall design and manufacturing of the electrode.

[0032] In some embodiments, the electrode tab includes multiple layers of sub-electrodes stacked on the arrangement, wherein the thickness of each sub-electrode corresponding to a first portion is greater than the thickness of the sub-electrode corresponding to a second portion.

[0033] By using the above technical solution, the thickness of different sections of each sub-tab is set to be different, so that the thickness of the first part is greater than the thickness of the second part, which facilitates the stacking of the tabs.

[0034] In some embodiments, each adapter includes at least two connection regions at different distances from the first surface, and each corresponding tab includes at least two connection portions respectively connected to at least two connection regions.

[0035] The above technical solutions can increase the cross-sectional area of ​​each tab, thereby further improving the current carrying capacity of the battery cell.

[0036] In some embodiments, the sub-connection area and the connection portion are spaced apart.

[0037] The above technical solution facilitates the connection between the sub-connection area and the electrode terminal, reducing the impact on the electrode tab.

[0038] In some embodiments, the distance between the sub-connection area and the adjacent connection portion is greater than or equal to 2 mm.

[0039] The above technical solution makes it easy to determine the length and position of the electrode tab, as well as the position of the sub-connection area, so as to connect the electrode terminal and the adapter plate.

[0040] Secondly, embodiments of this application provide a battery device, including a battery cell as described in the above embodiments.

[0041] Thirdly, embodiments of this application provide an energy storage device, including a battery cell as described in the above embodiments or a battery device as described in the above embodiments, wherein the battery cell or battery device is used to store or provide electrical energy.

[0042] Fourthly, embodiments of this application provide an energy storage system, including a power conversion device and an energy storage device as described in the above embodiments, wherein the power conversion device is electrically connected between the power generation device and the energy storage device.

[0043] Fifthly, embodiments of this application provide an electrical device, including a battery cell, a battery device, an energy storage device, or an energy storage system as described in the above embodiments, wherein the battery cell or battery device is used to store or provide electrical energy.

[0044] Sixthly, embodiments of this application provide a charging network, including a charging pile and an energy storage device or an energy storage system as described in the above embodiments, wherein the energy storage device is used to provide electrical energy to the charging pile.

[0045] 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

[0046] 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.

[0047] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0048] Figure 2 This is a schematic diagram of the structure of a charging network according to some embodiments of this application;

[0049] Figure 3 This is a schematic diagram of the structure of an energy storage system according to some embodiments of this application;

[0050] Figure 4 This is a schematic diagram of the structure of an energy storage device according to some embodiments of this application;

[0051] Figure 5 This is an exploded view of the battery device according to some embodiments of this application;

[0052] Figure 6 This is an exploded structural diagram of a battery cell according to some embodiments of this application;

[0053] Figure 7 This is a cross-sectional view of a battery cell in some embodiments of this application.

[0054] Figure 8 for Figure 7 Enlarged view of the middle section structure;

[0055] Figure 9 This is a schematic diagram of the multilayer sub-tab stacked structure in a battery cell of some embodiments of this application. Figure 1 ;

[0056] Figure 10 This is a schematic diagram of the multilayer sub-tab stacked structure in a battery cell of some embodiments of this application. Figure 2 ;

[0057] Figure 11 This is a schematic diagram of the multilayer sub-tab stacked structure in a battery cell of some embodiments of this application. Figure 3 ;

[0058] Figure 12 This is a schematic diagram of the multilayer sub-tab stacked structure in a battery cell of some embodiments of this application. Figure 4 ;

[0059] Figure 13This is a schematic diagram of the multilayer sub-tab stacked structure in a battery cell of some embodiments of this application. Figure 5 ;

[0060] Figure 14 This is a schematic diagram of the multilayer sub-tab stacked structure in a battery cell of some embodiments of this application. Figure 6 .

[0061] The main markings in the attached figures are as follows:

[0062] 11. Vehicle; 111. Controller; 112. Motor;

[0063] 12. Charging network; 121. Charging station; 122. Connector;

[0064] 13. Energy storage system; 131. Power conversion device; 132. Power generation device; 14. Energy storage device; 141. Cabinet;

[0065] 200. Battery assembly; 20. Housing; 21. Top cover; 22. Base plate; 23. Frame; 24. Reinforcing beam; 241. Mounting beam;

[0066] 300. Battery cell; 31. Electrode assembly; 311. Main body; 3110. First surface; 312. Tab; 3121. Positive tab; 3122. Negative tab; 3120. Connecting part; 31201. First part; 31202. Second part; 3123. Sub-tab; 31230. Cutout; 31231. First sub-tab; 31232. Second sub-tab; 32. Casing; 321 321. Housing; 322. End cap; 3221. Isolator; 3201. Liquid injection port; 3202. Pressure relief mechanism; 33. Electrode terminal; 331. Positive terminal; 332. Negative terminal; 34. Adapter piece; 341. Positive adapter piece; 342. Negative adapter piece; 340. Connection area; 3401. First area; 3402. Second area; 34021. Sub-connection area; 35. Insulating film; 36. Support plate;

[0067] X, length direction; Y, width direction; Z, height direction. Detailed Implementation

[0068] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0070] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0071] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments in any suitable manner.

[0072] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0073] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0074] In the description of the embodiments in 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: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0075] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces). "Several" means one or more, unless otherwise explicitly specified.

[0076] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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 the embodiments of this application.

[0077] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" 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 the embodiments of this application can be understood according to the specific circumstances.

[0078] In the description of the embodiments of this application, unless otherwise expressly specified and limited, when an element is referred to as "fixed to" or "set on" another element, it may be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it may be directly connected to or indirectly connected to the other element.

[0079] In the description of the embodiments in this application, unless otherwise expressly specified and limited, the technical term "proximity" refers to being close in location. For example, among three components A1, A2, and B, the distance between A1 and B is greater than the distance between A2 and B. Therefore, A2 is closer to B than A1, meaning A2 is adjacent to B, or B is adjacent to A2. Similarly, when there are multiple components C, namely C1, C2, ..., C... N If one of the C components, such as C2, is closer to the B component than the other C components, then B is adjacent to C2, or C2 is adjacent to B.

[0080] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development. As the smallest unit for storing and releasing electrical energy, the technology of the battery cell plays a decisive role in the overall performance of the battery.

[0081] A typical battery cell includes an electrode assembly and electrode terminals. The tabs on the electrode assembly are often connected to the electrode terminals via adapter plates. Part of the adapter plate needs to connect to the tabs, and the other part needs to connect to the electrode terminals. The distance between the electrode terminals and the electrode assembly often necessitates a bent design on the adapter plate, creating a height difference on both sides to allow connection between the electrode terminals and tabs on either side. However, this structure results in a shorter tab length and a smaller cross-sectional area because the tab is only located on one side of the adapter plate, leading to a weaker current-carrying capacity in the battery cell.

[0082] Based on the above considerations, and to address the issue of weak current-carrying capacity in battery cells using bent adapter plates in related technologies, this application provides a battery cell that facilitates connection between electrode terminals and corresponding tabs by providing at least two connection regions at different distances from the first surface of the electrode assembly using at least one adapter plate. Furthermore, at least two connection portions of different thicknesses are adapted to the corresponding tabs to accommodate the distance between the connection regions and the first surface. This allows at least two connection regions to be connected to connection portions of corresponding thicknesses, improving connection stability. Additionally, the overall length of the tabs can be extended to the side of the adapter plate connecting the electrode terminals, allowing for a longer overall length and increased cross-sectional area, thereby enhancing the current-carrying capacity of the tabs and improving the overall current-carrying capacity and charge / discharge performance of the battery cell.

[0083] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0084] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0085] The battery cell in this application embodiment includes an electrode assembly. The electrode assembly, also known as a bare cell, is a component for storing and releasing electrical energy. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The electrode assembly primarily operates by the movement of metal ions between the positive and negative electrode plates. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The portion of the positive current collector not coated with the positive active material layer protrudes beyond the portion coated with the positive active material layer. This uncoated portion serves as the positive electrode tab, or a metal conductor can be welded onto the positive current collector and led out to serve as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The portion of the negative current collector not coated with the negative active material layer protrudes beyond the portion coated with the negative active material layer. This uncoated portion serves as the negative electrode tab. Alternatively, a metal conductor can be soldered onto the negative current collector and led out to serve as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can pass through without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together. Understandably, in an electrode assembly, there can be one positive electrode tab and one negative electrode tab. That is, the electrode assembly has two sets of tabs, each set including at least one tab, with one set being the positive electrode tab and the other the negative electrode tab. The positive and negative electrode tabs are collectively referred to as tabs. Since each electrode is composed of multiple electrodes stacked together, each electrode can be called a sub-electrode, and the whole formed by the stacking can be called an electrode.

[0086] Electrode assemblies can be either wound or stacked structures. This application's embodiments are not limited to these. Wound structures typically involve welding tabs to the current collector, then arranging them in the order of positive electrode – separator – negative electrode – separator; and then winding them to form a cylindrical or square cell. Stacked structures typically involve leading tabs from the current collector, arranging the positive electrode, negative electrode, and separator in the order of positive electrode – separator – negative electrode – separator, and stacking them layer by layer to form a stacked cell; wherein, the separator can be cut and directly stacked as separator sheets, or the separator can be stacked in a Z-shaped fold without cutting it. The separator material can be PP (Polypropylene) or PE (Polyethylene), etc. The separator is an insulating film placed between the positive and negative electrodes. Its main function is to isolate the positive and negative electrodes and prevent electrons in the battery from freely passing through, preventing short circuits, while allowing ions in the electrolyte to freely pass between the positive and negative electrodes to form a circuit between them. Positive and negative electrode plates are collectively referred to as electrodes.

[0087] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0088] For ease of explanation, an electrical device is provided in one embodiment of this application, with a vehicle as an example.

[0089] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 11 provided in some embodiments of this application. The vehicle 11 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 200 is provided inside the vehicle 11, and the battery device 200 can be located at the bottom, front, or rear of the vehicle 11. The battery device 200 can be used to power the vehicle 11; for example, the battery device 200 can serve as the operating power source for the vehicle 11. The vehicle 11 may also include a controller 111 and a motor 112. The controller 111 is used to control the battery device 200 to supply power to the motor 112, for example, to meet the power needs of the vehicle 11 during starting, navigation, and driving.

[0090] In some embodiments, the battery device 200 can not only serve as the operating power source for the vehicle 11, but also as the driving power source for the vehicle 11, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 11.

[0091] Please refer to Figure 2 This application provides a charging network 12, including a charging pile 121 and an energy storage device 14. The charging pile 121 is electrically connected to the energy storage device 14, which provides power to the charging pile 121. The charging pile 121 is electrically connected to a battery device 200 in the energy storage device 14 via a cable, and the battery device 200 can provide its stored energy to the charging pile 121. The charging pile 121 has one or more connectors 122 for connecting to electrical equipment (such as a vehicle 11), thereby enabling the charging equipment to be recharged.

[0092] The energy storage device 14 can be located inside the charging pile 121 (e.g., an integrated energy storage and charging unit) or outside the charging pile 121.

[0093] In some embodiments, the charging network 12 may include a charging pile 121 and an energy storage system. The charging pile 121 is electrically connected to the energy storage system, which provides electrical energy to the charging pile 121. The charging pile 121 is electrically connected to a battery device 200 in the energy storage system via a cable, and the battery device 200 can provide its stored electrical energy to the charging pile 121.

[0094] Please refer to Figure 3 This application provides an energy storage system 13, which may include one or more energy storage devices 14 and a power converter system (PCS). The power converter system 131 is connected between a power generation device 132 and the energy storage devices 14. The power generation device 132 generates electrical energy, which can be stored in the energy storage device 14 through the power converter system 131. As an example, the power generation device 132 may be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. The specific type of the power generation device 132 is not limited in this application.

[0095] Please refer to Figure 4 This application provides an energy storage device 14, including one or more battery clusters to increase the voltage and capacity of the energy storage device 14. A battery cluster may include one or more battery devices 200, and multiple battery devices 200 are connected in series via a busbar to increase the voltage of the energy storage device 14. When the energy storage device 14 includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device 14.

[0096] The energy storage device 14 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device 14 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 14 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system 13 provided in this application embodiment can be any power system that requires the use of the energy storage device 14.

[0097] In some embodiments, the energy storage device 14 is an energy storage cabinet. Of course, the energy storage device 14 can also be an energy storage container.

[0098] In some embodiments, the energy storage device 14 may include a cabinet 141 and one or more battery clusters housed within the cabinet 141. Alternatively, the energy storage device 14 may also include one or more battery devices 200, which are directly housed within the cabinet 141.

[0099] In some embodiments, the energy storage device 14 may 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.

[0100] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 200 via piping to regulate the temperature of the individual battery cells.

[0101] As an example, 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 instance, it 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.

[0102] As an example, the central control module can serve as the battery management unit of the energy storage device 14, used to monitor and manage the energy storage device 14. The central control module can monitor information such as current, voltage, power, state of charge, or temperature of the energy storage device 14. For example, it can control the charging and discharging current and voltage of the energy storage device 14. 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.

[0103] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., for detecting, alarming or extinguishing fires in the energy storage system 13.

[0104] As an example, the power distribution module can be used to distribute power to the modules in the energy storage device 14 that require electricity.

[0105] Please refer to Figure 5 This application provides a battery device 200. The battery device 200 may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells 300, which are connected in series, parallel, or mixed connection via a busbar.

[0106] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 300.

[0107] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 300 together. As another example, a battery module can be formed by bundling multiple battery cells 300 together with cable ties.

[0108] In some embodiments, the battery device 200 may be a battery pack, which includes a housing 20 and one or more individual battery cell assemblies housed within the housing 20.

[0109] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 20 by fixing the battery module in the housing 20.

[0110] As an example, the battery cell assembly can also be housed in the housing 20 by directly fixing multiple battery cells 300 to the housing 20.

[0111] In some embodiments, the housing 20 may include a top cover 21, a frame 23, and a bottom plate 22. The top cover 21 and the bottom plate 22 are respectively connected to opposite sides of the frame 23, thereby forming a closed space inside the housing 20 to accommodate the battery cells 300. The frame 23 refers to the partial structure forming the peripheral sidewall of the housing 20, the top cover 21 refers to the plate-like structure forming the top of the housing 20, and the bottom plate 22 refers to the plate-like structure forming the bottom of the housing 20.

[0112] In some embodiments, the housing 20 may include a first housing and a second housing, which are fastened together to form a closed space inside the housing 20 to accommodate the battery cells 300. Here, "closed" refers to covering or shutting down, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate of the housing 20. Both the first and second housings may also be hollow structures with an opening on one side, with the opening side of the first housing fitting over the opening side of the second housing.

[0113] In some embodiments, the box body 20 includes a reinforcing beam 24 connected to the frame 23. The reinforcing beam 24 is a structural member provided on the box body 20 to increase the structural strength of the box body 20. The reinforcing beam 24 is provided and connected to the frame 23 to enhance the structural strength of the box body 20.

[0114] In some embodiments, the reinforcing beam 24 includes a mounting beam 241, which is fixedly connected to the frame 23 and is used to connect an external device using the battery device 200 to support the battery device 200 on the device.

[0115] In some embodiments, the reinforcing beam 24 includes an expansion beam installed inside the housing 20 to increase the structural strength of the housing 20, and can also be used to support the battery cell 300 to limit the expansion deformation of the battery cell 300.

[0116] In some embodiments, the expansion beam can also be connected to the bottom plate 22 of the box 20 to better fix the expansion beam in the box 20.

[0117] In some embodiments, the housing 20 may be part of the vehicle's chassis structure. For example, a portion of the housing 20 may be at least a portion of the vehicle's floor, or a portion of the housing 20 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0118] Please see Figure 6 Each battery cell 300 includes one or more electrode assemblies 31, also known as bare cells, which are components for storing and releasing electrical energy. When there are multiple electrode assemblies 31, they are connected in parallel.

[0119] In some embodiments, the electrode assembly 31 includes a main body 311, on which tabs 312 are provided. The main body 311 is the main part of the electrode assembly 31. The tabs 312 are used in the electrode assembly 31 to connect to an external circuit, allowing current to flow through the main body 311 for charging and discharging. The tabs 312 include a positive tab 3121 and a negative tab 3122, which are used to connect to the positive and negative terminals of the external circuit, respectively. The positive tab 3121 and the negative tab 3122 can be located on the same side of the main body 311, or they can be disposed on different sides of the main body 311, such as on opposite sides of the main body 311.

[0120] In some embodiments, the battery cell 300 includes a housing 32, which is a structure used to provide accommodating space to accommodate the electrode assembly 31 and to support and protect the electrode assembly 31.

[0121] Please see Figure 6 The battery cell 300 has a length direction, a width direction, and a height direction. As shown in the figure, X indicates the length direction, Y indicates the width direction, and Z indicates the height direction. The length direction of the tab 312 is consistent with the length direction of the battery cell 300.

[0122] In some embodiments, the housing 32 includes a housing 321 and an end cap 322, with the electrode assembly 31 mounted in the housing 321 and the end cap 322 covering the housing 321.

[0123] End cap 322 refers to a component that covers the opening of housing 321 to isolate the internal environment of battery cell 300 from the external environment. The shape of end cap 322 can be adapted to the shape of housing 321 to fit onto housing 321. Optionally, end cap 322 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 322 is not easily deformed when subjected to compression and impact, so that battery cell 300 can have higher structural strength and improved reliability. The material of end cap 322 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application does not impose any special limitations on it.

[0124] The housing 321 is an assembly used to cooperate with the end cap 322 to form the internal environment of the battery cell 300, wherein the formed internal environment can accommodate the electrode assembly 31, electrolyte, and other components. The housing 321 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 321 can be determined according to the specific shape and size of the battery cell 300. The material of the housing 321 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application does not impose any special limitations on it.

[0125] In some embodiments, the end cap 322 is fitted with an isolator 3221, which can be used to isolate electrical connection components within the housing 321 from the end cap 322 to reduce the risk of short circuits. Exemplarily, the isolator 3221 can be made of plastic, rubber, or the like.

[0126] In some embodiments, the housing 32 is provided with an injection hole 3201. The injection hole 3201 refers to a hole structure for injecting electrolyte into the housing 32. After the electrode assembly 31 is manufactured, it needs to be installed in the housing 321 and electrolyte is injected so that the electrode assembly 31 is immersed in the electrolyte and can fully absorb the electrolyte. The electrolyte can provide some active ions for use as conductive ions during the charging and discharging process; in addition, the electrolyte provides ion channels, or carriers, so that ions can move freely in them to achieve electrical conduction between the electrodes. The injection hole 3201 is provided on the housing 32 to add electrolyte into the housing 32.

[0127] As an example, the injection port 3201 can be provided on the housing 321. Of course, the injection port 3201 can also be provided on the end cap 322.

[0128] In some embodiments, the housing 32 is provided with a pressure relief mechanism 3202, which is used to release internal pressure when the internal pressure or temperature of the battery cell 300 reaches a threshold. The pressure relief mechanism 3202 can be a structure such as an explosion-proof valve or an explosion-proof plate provided on the housing 32.

[0129] In some embodiments, the battery cell 300 includes electrode terminals 33 disposed on the housing 32 and connected to the tabs 312 of the electrode assembly 31. Electrode terminals 33 refer to conductive elements disposed on the housing 32. The connection between electrode terminals 33 and the tabs 312 of the electrode assembly 31 allows for the output of electrical energy from the battery cell 300 or the charging of the battery cell 300. The battery cell 300 typically has two electrode terminals 33: a positive terminal 331 and a negative terminal 332. The positive terminal 331 is connected to the positive tab 3121 of the electrode assembly 31, and the negative terminal 332 is connected to the negative tab 3122 of the electrode assembly 31.

[0130] In some embodiments, the battery cell 300 further includes two adapter pieces 34, each corresponding to one of the two electrode terminals 33. Each tab 312 is connected to its corresponding electrode terminal 33 via the adapter piece 34, facilitating a more secure connection between the tab 312 and the electrode terminal 33. The two adapter pieces 34 are a positive adapter piece 341 and a negative adapter piece 342. The positive adapter piece 341 connects the positive tab 3121 to the positive terminal 331, and the negative adapter piece 342 connects the negative tab 3122 to the negative terminal 332.

[0131] In some embodiments, the battery cell 300 includes an insulating film 35 that surrounds the electrode assembly 31 to bind the electrode assembly 31, thereby facilitating its insertion into the housing 32. The insulating film 35 also protects the electrode assembly 31. The insulating film 35 can be made of insulating materials such as polypropylene or polyethylene to effectively insulate the electrode assembly 31 from the housing 32, thereby reducing the risk of internal short circuits in the battery cell 300.

[0132] In some embodiments, the battery cell 300 further includes a support plate 36, which is mounted in the housing 32 to support the electrode assembly 31. The support plate 36 provides better support for the electrode assembly 31 and reduces deformation of the electrode assembly 31's edges caused by the rounded corners of the housing 32. The support plate 36 can be made of materials such as ceramic, plastic, or silicone.

[0133] Please see Figures 6 to 11According to some embodiments of this application, a battery cell 300 is provided, including a housing 32, an electrode assembly 31, electrode terminals 33, and an adapter plate 34. The electrode assembly 31 is installed in the housing 32 and includes a main body 311. A tab 312 is provided on a first surface 3110 of the main body 311. The electrode terminals 33 are installed on the housing 32. The adapter plate 34 connects the electrode terminals 33 and the tabs 312. At least one adapter plate 34 includes at least two connection areas 340 at different distances from the first surface 3110. One of the connection areas 340 has a sub-connection area 34021, which is connected to the electrode terminal 33. The corresponding tab 312 includes at least two connection portions 3120 respectively connected to at least two connection areas 340, and the thickness of the at least two connection portions 3120 is equal to the distance from the corresponding connection area 340 to the first surface 3110.

[0134] The outer casing 32 refers to the casing structure that forms the outer contour of the battery cell 300.

[0135] The electrode assembly 31 is a component in the battery cell 300 that stores and releases electrical energy. The electrode assembly 31 is installed in the housing 32, which supports and protects the electrode assembly 31.

[0136] The main body 311 refers to the main structural part of the electrode assembly 31. The tab 312 refers to the conductive portion extending from the main body 311 for connecting to the electrode terminal 33. The first surface 3110 refers to the side of the main body 311 where the tab 312 is provided. For example, the first surface 3110 can be the top surface of the main body 311 along the height direction, and correspondingly, the tab 312 can be provided at the top of the main body 311. For example, the first surface 3110 can be the bottom surface of the main body 311 along the height direction, and correspondingly, the tab 312 can be provided at the bottom of the main body 311. For example, tabs 312 are provided on opposite sides of the main body 311 along the height direction, and correspondingly, both opposite sides of the main body 311 along the height direction can be referred to as the first surface 3110. Please refer to [link / reference]. Figures 7 to 11 As an example, the thickness direction of the tab 312 is set in the same direction as the height direction of the battery cell 300.

[0137] The adapter piece 34 is a conductive component that connects the electrode terminal 33 to the corresponding tab 312. The adapter piece 34 is generally designed with a flat structure such as a sheet or plate to facilitate bending and adaptability for connecting the electrode terminal 33 and the tab 312. The adapter piece 34 can be made of metals such as copper, aluminum, or nickel to ensure good conductivity and heat resistance. In some embodiments, the adapter piece 34 can also be made of conductive plastic or other materials. The number of adapter pieces 34 can be one or two. With one adapter piece 34, it can be connected to one tab 312, while the other tab 312 can be directly connected to the corresponding electrode terminal 33. With two adapter pieces 34, the two tabs 312 can be connected to their respective electrode terminals 33 via the adapter piece 34.

[0138] Electrode terminal 33 refers to a conductive component disposed on the housing 32 and used to connect to the tab 312 in order to output electrical energy from the battery cell 300 or to charge the battery cell 300. Electrode terminal 33 is disposed on the side of the housing 32 near the first surface 3110.

[0139] At least one adapter piece 34 includes at least two connection regions 340 at different distances from the first surface 3110. This means that one or both adapter pieces 34 in the battery cell 300 have at least two connection regions 340, and the distances of the at least two connection regions 340 on the adapter piece 34 from the first surface 3110 are not equal. A connection region 340 refers to a segment on the adapter piece 34. One of the connection regions 340 has a sub-connection region 34021. This means that one of the connection regions 340 on the adapter piece 34 has a sub-connection region 34021. The sub-connection region 34021 refers to a segment on the corresponding connection region 340 used for mating and connecting with the electrode terminal 33.

[0140] As an example, the adapter 34 may include two connection areas 340, and the distances of the two connection areas 340 to the first surface 3110 are not equal. As an example, the adapter 34 may also include three or four connection areas 340, and at least two of these connection areas 340 are not equidistant from the first surface 3110.

[0141] As an example, grooves can be stamped into the adapter piece 34 to form at least two connection areas 340 with unequal distances to the first surface 3110 after connecting the tab 312 and the corresponding electrode terminal 33. As an example, the adapter piece 34 can also be bent to form at least two connection areas 340 with unequal distances to the first surface 3110 after connecting the tab 312 and the corresponding electrode terminal 33. As an example, the adapter piece 34 can be stamped into a stepped shape to form at least two connection areas 340 with unequal distances to the first surface 3110 after connecting the tab 312 and the corresponding electrode terminal 33.

[0142] Sub-connection area 34021 is connected to electrode terminal 33 to connect adapter piece 34 to electrode terminal 33. Sub-connection area 34021 and electrode terminal 33 can be connected by welding, bonding, riveting, or other methods to achieve current conduction between adapter piece 34 and electrode terminal 33.

[0143] The corresponding tab 312 refers to the tab 312 connected to the adapter piece 34 which has at least two connection areas 340.

[0144] The connecting part 3120 refers to a section on the tab 312.

[0145] The corresponding tab 312 includes at least two connecting portions 3120 respectively connected to at least two connecting areas 340. This means that the corresponding tab 312 is provided with at least two connecting portions 3120, and these connecting portions 3120 on the tab 312 are connected one-to-one with the connecting areas 340 on the adapter piece 34 to facilitate the connection between the tab 312 and the adapter piece 34. The connecting areas 340 and the connecting portions 3120 can be connected by welding, bonding, or other methods to achieve current conduction between the adapter piece 34 and the tab 312.

[0146] The fact that the thickness of at least two connecting portions 3120 is equal to the distance from the corresponding connecting region 340 to the first surface 3110 means that the thickness of the corresponding connecting portion 3120 is equal to the distance from the connecting region 340 to the first surface 3110. This ensures that the connecting portion 3120 is connected to the corresponding connecting region 340, and also reduces interference with the connection between other connecting regions 340 and their corresponding connecting portions 3120. This allows each connecting portion 3120 of the tab 312 to be stably connected to the corresponding connecting region 340 on the adapter 34, thereby enabling the current to flow smoothly between the connecting region 340 and the connecting portion 3120, reducing the contact resistance between the connecting region 340 and the connecting portion 3120, and improving the current carrying capacity. In addition, at least two connecting portions 3120 of different thicknesses are adapted to the corresponding tab 312 to adapt to the distance between the corresponding connecting area 340 and the first surface 3110, thereby enabling at least two connecting areas 340 to be connected to the connecting portions 3120 of the corresponding thickness. This not only improves the stability of the connection, but also extends the overall length of the tab 312 to the side of the adapter piece 34 connected to the electrode terminal 33, so that the overall length of the tab 312 can be made longer. Correspondingly, the overall cross-sectional area of ​​the tab 312 can also be increased, thereby improving the current carrying capacity of the tab 312, so as to improve the overall current carrying capacity and charge / discharge performance of the battery cell 300.

[0147] The cross-sectional area of ​​tab 312 refers to the area of ​​a section perpendicular to the thickness direction and parallel to the length direction of tab 312. Overcurrent capacity refers to the ability to withstand the magnitude of current passing through it.

[0148] In the technical solution of this application embodiment, by providing at least two connecting portions 3120 of different thicknesses on the tab 312 to adapt to the corresponding connecting area 340 of the connecting adapter 34, the overall length and cross-sectional area of ​​the tab 312 of the electrode assembly 31 can be increased, thereby improving the current carrying capacity.

[0149] In some embodiments, please refer to Figures 7 to 11 At least two connecting portions 3120 include a first portion 31201 and a second portion 31202 connected to the first portion 31201; at least two connecting regions 340 include a first region 3401 and a second region 3402 connected to the first region 3401, the first portion 31201 is connected to the first region 3401, the second portion 31202 is connected to the second region 3402, and the second region 3402 is provided with a sub-connecting region 34021.

[0150] At least two connecting portions 3120 include a first portion 31201 and a second portion 31202 connected to the first portion 31201. This means that the connecting portion 3120 on the tab 312 includes a first portion 31201 and a second portion 31202, and the first portion 31201 is connected to the second portion 31202. The first portion 31201 is one connecting portion 3120 on the tab 312. The second portion 31202 is another connecting portion 3120 on the tab 312.

[0151] At least two connection areas 340 including a first area 3401 and a second area 3402 connected to the first area 3401 means that the connection areas 340 on the adapter piece 34 include a first area 3401 and a second area 3402, and the first area 3401 is connected to the second area 3402. The first area 3401 refers to one connection area 340 on the adapter piece 34. The second area 3402 is another connection area 340 on the adapter piece 34.

[0152] The connection between the first part 31201 and the first region 3401 means that the first part 31201 of the tab 312 is located at the corresponding position of the first region 3401 of the adapter 34, and the first part 31201 and the first region 3401 can be connected by welding, bonding or other methods so that current can flow between the first part 31201 and the first region 3401.

[0153] The connection between the second part 31202 and the second region 3402 means that the second part 31202 of the tab 312 is located at the corresponding position of the second region 3402 of the adapter piece 34, and the second part 31202 and the second region 3402 can be connected by welding, bonding or other methods so that current can flow between the second part 31202 and the second region 3402.

[0154] The second region 3402 having a sub-connection region 34021 means that the sub-connection region 34021 is a part of the second region 3402. The sub-connection region 34021 is provided in the second region 3402 so as to be connected to the electrode terminal 33, thereby connecting the second region 3402 to the electrode terminal 33.

[0155] The electrode 312 is provided with a first part 31201 and a second part 31202, and the adapter 34 is provided with a first area 3401 and a second area 3402. The structure is simple, easy to manufacture, and also easy to adapt and connect the electrode 312 and the adapter 34.

[0156] Through the above technical solution, the tab 312 is provided with an adjacent first part 31201 and a second part 31202, and the adapter 34 is provided with an adjacent first region 3401 and a second region 3402, so as to facilitate processing and manufacturing.

[0157] In some embodiments, please refer to Figure 7 and Figure 8 The distance from the first region 3401 to the first surface 3110 is greater than the distance from the second region 3402 to the first surface 3110. Accordingly, the thickness of the first part 31201 is greater than the thickness of the second part 31202.

[0158] The distance from the first region 3401 to the first surface 3110 is greater than the distance from the second region 3402 to the first surface 3110. For example, if the distance from the first region 3401 to the first surface 3110 is A, and the distance from the second region 3402 to the first surface 3110 is B, then A is greater than B.

[0159] The thickness of the first part 31201 is greater than the thickness of the second part 31202, so that the first part 31201 is connected to the first region 3401 and the second part 31202 is connected to the second region 3402.

[0160] Through the above technical solution, since the second region 3402 needs to be connected to the electrode terminal 33, it will occupy the overall space of the second region 3402. By setting the distance from the first region 3401 to the first surface 3110 to be larger, the thickness of the first part 31201 corresponding to the first region 3401 can be set to be larger. Correspondingly, the overall cross-sectional area of ​​the tab 312 can be set to be larger, so as to improve the current carrying capacity of the electrode assembly 31. Moreover, the distance from the electrode terminal 33 to the first surface 3110 can be reduced, thereby reducing the overall height of the battery cell 300 and improving the space utilization and volumetric energy density of the battery cell 300.

[0161] In some embodiments, the distance from the first region 3401 to the first surface 3110 may be set to be less than the distance from the second region 3402 to the first surface 3110. Correspondingly, the thickness of the first portion 31201 may be set to be less than the thickness of the second portion 31202 in order to adapt to the connection between the corresponding tab 312 and the electrode terminal 33.

[0162] In some embodiments, please refer to Figures 7 to 11 The tab 312 includes multiple layers of sub-tabs 3123 stacked on top of each other, and the thickness of each sub-tab 3123 is the same.

[0163] Since the electrode assembly 31 is formed by stacking multiple pieces of electrode tabs 312 during manufacturing, each piece of electrode tab 312 is called a sub-electrode tab 3123, and the whole formed by stacking sub-electrode tabs 3123 is called electrode tab 312.

[0164] The uniform thickness of each layer of sub-tabs 3123 means that the thickness of each layer of sub-tabs 3123 is equal or approximately equal. Approximately equal means that the thickness of the sub-tabs 3123 relative to the average value can have a certain degree of error.

[0165] Setting the thickness of each layer of sub-tab 3123 to be consistent can facilitate the processing and manufacturing of sub-tab 3123.

[0166] The above technical solution makes it easy to determine the number of layers of the sub-tab 3123 in the first part 31201 and the number of layers of the sub-tab 3123 in the second part 31202, which facilitates the setting and manufacturing of the tab 312.

[0167] In some embodiments, please refer to Figures 7 to 11 The multilayer sub-taper 3123 includes a first sub-taper 31231 and a second sub-taper 31232. One side of the first sub-taper 31231 is aligned with one side of the second sub-taper 31232 to form a first part 31201. The other side of the first sub-taper 31231 extends out of the second sub-taper 31232 to form a second part 31202.

[0168] The first sub-taper 31231 refers to a portion of the sub-taper 3123 in the multi-layer sub-taper 3123. The second sub-taper 31232 refers to another portion of the sub-taper 3123 in the multi-layer sub-taper 3123.

[0169] The first part 31201 is formed by aligning one side of the first sub-taper 31231 with one side of the second sub-taper 31232. This means that the first sub-taper 31231 and the second sub-taper 31232 are stacked to form the entire electrode 312, and one side of the first sub-taper 31231 is aligned with one side of the second sub-taper 31232. This makes the first part 31201 include both the first sub-taper 31231 and the second sub-taper 31232, so that the electrode 312 is relatively thick overall.

[0170] The alignment of one side of the first sub-taper 31231 with one side of the second sub-taper 31232 means that, along the thickness direction of the taper 312, one side of the first sub-taper 31231 overlaps with one side of the second sub-taper 31232, and the edge of one side of the first sub-taper 31231 is approximately flush with the edge of one side of the second sub-taper 31232. "Approximately flush" means completely flush or relatively completely flush, allowing for a certain degree of error.

[0171] The second part 31202 is formed by the extension of the second sub-taper 31232 from the other side of the first sub-taper 31231. This means that the overall length of the first sub-taper 31231 is longer than the length of the second sub-taper 31232. Correspondingly, when one side of the first sub-taper 31231 is aligned and stacked with one side of the second sub-taper 31232, the other side of the first sub-taper 31231 will protrude from the second sub-taper 31232, and this protruding part forms the second part 31202, which is relatively thin overall, of the taper 312.

[0172] Through the above technical solution, the first sub-taper 31231 is used to extend the second sub-taper 31232 to form the second part 31202, which is convenient for manufacturing.

[0173] In some embodiments, please refer to Figure 8 and Figure 9 Each first sub-taper 31231 is located on the side of the second sub-taper 31232 closer to the first surface 3110. That is, among the stacked first sub-taper 31231 and second sub-taper 31232, the first sub-taper 31231 is sequentially located on the side of the second sub-taper 31232, and the first sub-taper 31231 is closer to the first surface 3110 than the second sub-taper 31232.

[0174] The above technical solution facilitates the positioning of the first sub-electrode 31231 and also makes the overall processing and manufacturing of the electrode 312 easier.

[0175] In some embodiments, each first sub-taper 31231 is disposed on the side of the second sub-taper 31232 away from the first surface 3110. That is, among the stacked first sub-taper 31231 and second sub-taper 31232, the first sub-taper 31231 is disposed on one side of the second sub-taper 31232, and the first sub-taper 31231 is further away from the first surface 3110 than the second sub-taper 31232.

[0176] The above technical solution facilitates the positioning of the first sub-electrode 31231 and also makes the overall processing and manufacturing of the electrode 312 easier.

[0177] In some embodiments, the first sub-taper 31231 and the second sub-taper 31232 can be alternately arranged, or a portion of the first sub-taper 31231 and a portion of the second sub-taper 31232 can be alternately arranged, so as to facilitate the flexible arrangement of the first sub-taper 31231 and the second sub-taper 31232 in the thickness direction of the tab 312.

[0178] In some embodiments, please refer to Figures 7 to 11 The thickness of each layer of sub-tabs 3123 is C, the distance from the first region 3401 to the first surface 3110 is A, the distance from the second region 3402 to the first surface 3110 is B, the first part 31201 is provided with A / C layer sub-tabs 3123, and the overall thickness of the second part 31202 is the thickness of B / C layer sub-tabs 3123.

[0179] Setting the thickness of each layer of sub-tab 3123 as C facilitates the fabrication of the tab 312. The thickness C of each layer of sub-tab 3123 can be designed and fabricated as needed. As an example, C can range from 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm, 70μm, 80μm, 90μm, 100μm, etc.

[0180] The distance from the first region 3401 to the first surface 3110 is A, and the distance from the second region 3402 to the first surface 3110 is B. Since the thickness of the first portion 31201 on the tab 312 is equal to the distance A from the first region 3401 to the first surface 3110, and the thickness of the second portion 31202 is equal to the distance B from the second region 3402 to the first surface 3110, the number of layers of sub-tabs 3123 forming the first portion 31201 and the second portion 31202 can be determined accordingly. Because the first portion 31201 is thicker, the number of layers of sub-tabs 3123 in the first portion 31201 can be determined to be A / C layers based on the distance A from the first region 3401 to the first surface 3110 and the thickness C of the sub-tabs 3123.

[0181] The overall thickness of the second part 31202 is the thickness of the sub-tabs 3123 of the B / C layer. This means that the overall thickness of each sub-tab 3123 after the segments forming the second part 31202 are stacked is equivalent to the complete sub-tab 3123 of the corresponding B / C layer.

[0182] The above technical solution makes it easy to determine the number of layers of the sub-tab 3123 in the first part 31201 and the number of layers of the sub-tab 3123 in the second part 31202, which facilitates the setting and manufacturing of the tab 312.

[0183] In some embodiments, please refer to Figure 8 and Figure 9 The thickness of each sub-tab 3123 is C, the distance from the first region 3401 to the first surface 3110 is A, the distance from the second region 3402 to the first surface 3110 is B, the first sub-tab 31231 is a B / C layer, and the second sub-tab 31232 is a (AB) / C layer.

[0184] Since the first part 31201 is formed by the stacking of the first sub-taper 31231 and the second sub-taper 31232, setting the number of the first sub-taper 31231 to B / C layers and the number of the second sub-taper 31232 to (AB) / C layers can make the number of sub-taper 3123 layers corresponding to the first part 31201 A / C layers.

[0185] Since the second part 31202 is a partial extension of the first sub-tab 31231, setting the first sub-tab 31231 as a B / C layer can ensure that the first sub-tab 31231 maintains a relatively complete length, which is convenient for the design and manufacturing of the first sub-tab 31231.

[0186] By setting the first sub-tab 31231 as the B / C layer through the above technical solution, it is convenient to process and manufacture the tab 312 as a whole, so as to form the first part 31201 and the second part 31202.

[0187] In some embodiments, please refer to Figure 8 , Figures 10 to 14 The electrode 312 includes multiple layers of sub-electrodes 3123 stacked on top of each other. At least a portion of the sub-electrodes 3123 has a cutout 31230 so that the portion of the stacked multiple sub-electrodes 3123 corresponding to the second region 3402 forms a second portion 31202.

[0188] The notch 31230 refers to the notch structure provided on the sub-tab 3123. When multiple sub-tabs 3123 are stacked, the position of the tab 312 corresponding to the notch 31230 will be thinned accordingly. In this way, by setting different sizes and positions of the notches 31230 on the sub-tabs 3123, the overall thickness of the stacked tab 312 can be such that some areas are thicker and some areas are thinner, thus forming the first part 31201 and the second part 31202.

[0189] The statement that "at least some of the sub-tabs 3123 have cutouts 31230" means that the cutouts 31230 can be provided on a portion of the sub-tabs 3123, or that the cutouts 31230 can be provided on each sub-tab 3123. The size and placement of the cutouts 31230 allow the stacked tabs 312 to form a first part 31201 and a second part 31202 with different thicknesses. The number of layers of sub-tabs 3123 can be set as needed.

[0190] For example, please refer to Figure 10 Taking a three-layer sub-tab 3123 as an example, a cut 31230 is set on each sub-tab 3123. By adjusting the size and position of the cut 31230, the thickness of the sub-tab 3123 on the formed tab 312 corresponding to the sub-tab 3123 forming the first part 31201 is the sum of the thicknesses of the three sub-tabs 3123, and the thickness of the sub-tab 3123 on the formed tab 312 corresponding to the sub-tab 3123 forming the second part 31202 is the sum of the thicknesses of the two sub-tabs 3123.

[0191] For example, please refer to Figure 11 Taking a three-layer sub-tab 3123 as an example, a cut 31230 is set on each sub-tab 3123. By adjusting the size and position of the cut 31230, the thickness of the sub-tab 3123 on the formed tab 312 corresponding to the formation of the first part 31201 is the sum of the thicknesses of the three sub-tabs 3123, while the thickness of the sub-tab 3123 on the formed tab 312 corresponding to the formation of the second part 31202 is the thickness of one sub-tab 3123.

[0192] For example, please refer to Figure 12 Taking two layers of sub-tabs 3123 as an example, two cuts 31230 are set at intervals on each sub-tab 3123. By the size and position layout of the cuts 31230, the thickness of the sub-tab 3123 on the formed tab 312 corresponding to the formation of the first part 31201 is the sum of the thicknesses of the two layers of sub-tabs 3123, while the thickness of the sub-tab 3123 on the formed tab 312 corresponding to the formation of the second part 31202 is the thickness of one layer of sub-tab 3123.

[0193] For example, please refer to Figure 13 Taking a three-layer sub-tab 3123 as an example, cuts 31230 are provided on two of the sub-tabs 3123, and two cuts 31230 are provided at intervals on each sub-tab 3123. Through the size and position layout of the cuts 31230, the thickness of the sub-tab 3123 on the formed tab 312 corresponding to the formation of the first part 31201 is the sum of the thicknesses of the three sub-tabs 3123, and the thickness of the sub-tab 3123 on the formed tab 312 corresponding to the formation of the second part 31202 is the thickness of the two sub-tabs 3123.

[0194] For example, please refer to Figure 14 Taking a four-layer sub-tab 3123 as an example, each sub-tab 3123 is provided with a cut 31230. By the size and position layout of the cut 31230, the thickness of the sub-tab 3123 on the formed tab 312 corresponding to the formation of the first part 31201 is the sum of the thicknesses of the four sub-tabs 3123, and the thickness of the sub-tab 3123 on the formed tab 312 corresponding to the formation of the second part 31202 is the thickness of the three sub-tabs 3123.

[0195] Through the above technical solution, by setting a notch 31230 on some of the sub-tabs 3123, the thickness of the corresponding part is reduced. Then, by combining the notches 31230 on multiple sub-tabs 3123, a second part 31202 with a smaller thickness can be formed. In addition, the design of the notch 31230 allows for setting a longer length for more layers of sub-tabs 3123, thereby improving their current carrying capacity.

[0196] In some embodiments, please refer to Figure 10 , Figure 12 and Figure 13 Along the thickness direction of the sub-tab 3123, at least some of the cuts 31230 are misaligned, that is, the cuts 31230 on multiple sub-tabs 3123 are misaligned along the thickness direction of the tab 312.

[0197] Offset configuration refers to structures that are staggered and do not overlap in a specified direction.

[0198] By using the above technical solution, at least some of the cuts 31230 are misaligned in the thickness direction, and cuts 31230 can be set on more sub-tabs 3123 to set a larger length for more layers of sub-tabs 3123, thereby improving their current carrying capacity.

[0199] In some embodiments, please refer to Figure 10 , Figure 12 and Figure 13Along the length direction of the sub-tab 3123, at least some of the cuts 31230 are arranged adjacently. That is to say, after multiple sub-tabs 3123 are stacked, the cuts 31230 on them are arranged adjacently along the length direction of the tab 312.

[0200] The above technical solution can easily determine the position of the cut 31230 on each sub-tab 3123, and can also easily determine the thickness of each connecting part 3120 that forms the whole tab 312.

[0201] In some embodiments, please refer to Figure 11 and Figure 14 Along the thickness direction of the sub-tab 3123, at least some of the cuts 31230 are partially overlapped. This allows the size of the cuts 31230 on the sub-tab 3123 along the length direction of the tab 312 to be relatively small, thereby allowing more sub-tabs 31230 to be provided, which in turn improves the current carrying capacity of the battery cell 300.

[0202] In some embodiments, please refer to Figure 10 , Figure 12 and Figure 13 The dimensions of each cut 31230 along the length of the sub-electrode 3123 are equal. In other words, the dimensions of the cuts 31230 provided on the sub-electrode 3123 are equal along the length of the electrode 312.

[0203] By using the above technical solution, the dimensions of each cut 31230 are set to be equal, so as to facilitate the design and manufacturing of the cut 31230, and thus also facilitate the overall design and manufacturing of the tab 312.

[0204] In some embodiments, the tab 312 includes multiple layers of sub-tabs 3123 stacked on top of each other, wherein the thickness of each sub-tab 3123 corresponding to the first portion 31201 is greater than the thickness of the sub-tab 3123 corresponding to the second portion 31202.

[0205] The thickness of each sub-taper 3123 corresponding to the first part 31201 is greater than the thickness of the sub-taper 3123 corresponding to the second part 31202. This means that the thickness of each sub-taper 3123 corresponding to the sub-taper 3123 forming the first part 31201 is set to be thicker, while the thickness of each sub-taper 3123 corresponding to the sub-taper 3123 forming the second part 31202 is set to be thinner.

[0206] By using the above technical solution, the thickness of different sections of each sub-tab 3123 is set differently so that the thickness of the first part 31201 is greater than the thickness of the second part 31202, which facilitates the stacking of the tabs 312.

[0207] In some embodiments, please refer to Figure 7Each adapter piece 34 includes at least two connection areas 340 at different distances from the first surface 3110, and each corresponding tab 312 includes at least two connection portions 3120 respectively connected to at least two connection areas 340.

[0208] Each adapter piece 34 includes at least two connection areas 340 at different distances from the first surface 3110. In other words, each adapter piece 34 in the battery cell 300 is provided with at least two connection areas 340.

[0209] Each tab 312 includes at least two connecting portions 3120 that are respectively connected to at least two connecting regions 340. That is, each adapter piece 34 in the battery cell 300 is provided with at least two connecting regions 340.

[0210] The above technical solution can increase the cross-sectional area of ​​each tab 312, thereby further improving the current carrying capacity of the battery cell 300.

[0211] In some embodiments, please refer to Figure 7 and Figure 8 The sub-connection area 34021 and the connecting portion 3120 are spaced apart, that is, there is a gap D between the sub-connection area 34021 and the adjacent connecting portion 3120.

[0212] The above technical solution facilitates the connection between the sub-connection area 34021 and the electrode terminal 33, reducing the impact on the tab 312.

[0213] In some embodiments, please refer to Figure 7 and Figure 8 The distance D between the sub-connection area 34021 and the adjacent connection portion 3120 is greater than or equal to 2mm. For example, the distance D between the sub-connection area 34021 and the adjacent connection portion 3120 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc.

[0214] The above technical solution can easily determine the length and position of the tab 312 and the position of the sub-connection area 34021 so as to connect the electrode terminal 33 and the adapter piece 34.

[0215] According to some embodiments of this application, a battery cell 300 is provided, including a housing 32, an electrode assembly 31, electrode terminals 33, and an adapter plate 34. The electrode assembly 31 is mounted in the housing 32 and includes a main body 311. A tab 312 is provided on a first surface 3110 of the main body 311. The electrode terminals 33 are mounted on the housing 32. The adapter plate 34 connects the electrode terminals 33 and the tabs 312. Each adapter plate 34 includes a first region 3401 and a second region 3402. A sub-connection region 34021 is provided on the second region 3402 and is connected to the electrode terminals 33. The tab 312 includes a first portion 31201 and a second portion 31202. The first portion 31201 is connected to the first region 3401, and the second portion 31202 is connected to the second region 3402. The distance A from the first region 3401 to the first surface 3110 is greater than the distance B from the second region 3402 to the first surface 3110. Correspondingly, the thickness of the first part 31201 is greater than the thickness of the second part 31202. The distance A from the first region 3401 to the first surface 3110 is equal to the thickness of the first part 31201, and the distance B from the second region 3402 to the first surface 3110 is equal to the thickness of the second part 31202.

[0216] The distance A from the first region 3401 to the first surface 3110 is equal to the thickness of the first part 31201, and the distance B from the second region 3402 to the first surface 3110 is equal to the thickness of the second part 31202. This allows the first part 31201 to connect to the first region 3401, and the second part 31202 to connect to the second region 3402. It also reduces interference between the connections of the two connecting regions 340 and their corresponding connecting parts 3120, ensuring a stable connection between each connecting part 3120 of the tab 312 and the corresponding connecting region 340 on the adapter 34. This allows current to flow smoothly between the connecting regions 340 and the connecting parts 3120, reducing the contact resistance between them and improving current flow performance. Furthermore, due to the design of the first region 3401 and the second region 3402, as well as the first part 31201 and the second part 31202, the overall length of the tab 312 can be extended to the side of the adapter piece 34 that connects to the electrode terminal 33, so that the overall length of the tab 312 can be longer. Correspondingly, the overall cross-sectional area of ​​the tab 312 can also be increased, thereby improving the current carrying capacity of the tab 312, so as to improve the overall current carrying capacity and charge / discharge performance of the battery cell 300.

[0217] Since the second region 3402 needs to be connected to the electrode terminal 33, it will occupy the overall space of the second region 3402. By setting the distance from the first region 3401 to the first surface 3110 to be larger, the thickness of the first part 31201 corresponding to the first region 3401 can be set to be larger. Correspondingly, the overall cross-sectional area of ​​the tab 312 can be set to be larger, so as to improve the current carrying capacity of the electrode assembly 31. Moreover, the distance from the electrode terminal 33 to the first surface 3110 can be reduced, thereby reducing the overall height of the battery cell 300 and improving the space utilization and volumetric energy density of the battery cell 300.

[0218] According to some embodiments of this application, this application also provides a battery device 200, including a battery cell 300 as described in the above embodiments.

[0219] According to some embodiments of this application, this application also provides an energy storage device 14, including a battery cell 300 as described in the above embodiments or a battery device 200 as described in the above embodiments, wherein the battery cell 300 or the battery device 200 is used to store or provide electrical energy.

[0220] According to some embodiments of this application, this application also provides an energy storage system 13, including a power conversion device 131 and an energy storage device 14 as described in the above embodiments, wherein the power conversion device 131 is electrically connected between the power generation device 132 and the energy storage device 14.

[0221] According to some embodiments of this application, this application also provides an electrical device, including a battery cell 300 as described in the above embodiments, a battery device 200 as described in the above embodiments, an energy storage device 14 as described in the above embodiments, or an energy storage system 13 as described in the above embodiments, wherein the battery cell 300 or the battery device 200 is used to store or provide electrical energy.

[0222] According to some embodiments of this application, this application also provides a charging network 12, including a charging pile 121 and an energy storage device 14 as described in the above embodiments or an energy storage system 13 as described in the above embodiments, wherein the energy storage device 14 is used to provide electrical energy to the charging pile 121.

[0223] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: shell; An electrode assembly is installed in the housing. The electrode assembly includes a main body, and a tab is provided on a first surface of the main body. Electrode terminals are mounted on the housing; Adapter plate, connecting the electrode terminal to the electrode tab; At least one of the adapter pieces includes at least two connection areas at different distances from the first surface, one of the connection areas having a sub-connection area connected to the electrode terminal; the corresponding tab includes at least two connection portions respectively connected to at least two of the connection areas, and the thickness of the at least two connection portions is equal to the distance from the corresponding connection area to the first surface.

2. The battery cell as described in claim 1, characterized in that, The at least two connecting portions include a first portion and a second portion connected to the first portion; the at least two connecting regions include a first region and a second region connected to the first region, the first portion being connected to the first region, the second portion being connected to the second region, and the second region having the sub-connecting region.

3. The battery cell as described in claim 2, characterized in that, The distance from the first region to the first surface is greater than the distance from the second region to the first surface, and correspondingly, the thickness of the first part is greater than the thickness of the second part.

4. The battery cell as described in claim 3, characterized in that, The electrode tab includes multiple layers of sub-electrodes stacked on top of each other, with each layer of sub-electrodes having the same thickness.

5. The battery cell as described in claim 4, characterized in that, The multilayer sub-taper includes a first sub-taper and a second sub-taper, with one side of the first sub-taper aligned with one side of the second sub-taper to form the first portion, and the other side of the first sub-taper extending out of the second sub-taper to form the second portion.

6. The battery cell as described in claim 5, characterized in that, Each of the first sub-electrodes is located on the side of the second sub-electrode opposite to the first surface, or each of the first sub-electrodes is located on the side of the second sub-electrode close to the first surface.

7. The battery cell as described in claim 5 or 6, characterized in that, The distance from the first region to the first surface is A, the distance from the second region to the first surface is B, the thickness of each sub-tab is C, the first sub-tab is a B / C layer, and the second sub-tab is a (AB) / C layer.

8. The battery cell according to any one of claims 3-6, characterized in that, The electrode tab includes multiple layers of sub-electrodes stacked on top of each other, and at least a portion of the sub-electrodes has a cut so that the portions of the stacked multiple layers of sub-electrodes corresponding to the second region form the second part.

9. The battery cell as described in claim 8, characterized in that, At least a portion of the cuts are misaligned along the thickness direction of the sub-electrode.

10. The battery cell as described in claim 9, characterized in that, Along the length direction of the sub-electrode, at least some of the cuts are arranged adjacent to each other.

11. The battery cell as described in claim 8, characterized in that, The dimensions of each cut along the length of the sub-electrode are equal.

12. The battery cell according to any one of claims 2-6 and 9-11, characterized in that, The electrode tab includes multiple layers of sub-electrodes stacked on top of each other, and the thickness of each sub-electrode corresponding to the first part is greater than the thickness of the sub-electrode corresponding to the second part.

13. The battery cell according to any one of claims 1-6 and 9-11, characterized in that, Each of the adapter pieces includes at least two connection regions at different distances from the first surface, and each of the corresponding tabs includes at least two connection portions respectively connected to at least two of the connection regions.

14. The battery cell according to any one of claims 1-6 and 9-11, characterized in that, The sub-connection area is spaced apart from the connection portion.

15. The battery cell as described in claim 14, characterized in that, The distance between the sub-connection area and the adjacent connection portion is greater than or equal to 2 mm.

16. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-15.

17. An energy storage device, characterized in that, Includes a battery cell as described in any one of claims 1-15 or a battery device as described in claim 16, wherein the battery cell or the battery device is used to store or provide electrical energy.

18. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device as described in claim 17, wherein the power conversion device is electrically connected between the power generation device and the energy storage device.

19. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-15, a battery device as described in claim 16, an energy storage device as described in claim 17, or an energy storage system as described in claim 18, wherein the battery cell or the battery device is used to store or provide electrical energy.

20. A charging network, characterized in that, It includes a charging pile and an energy storage device as described in claim 17 or an energy storage system as described in claim 18, wherein the energy storage device is used to provide electrical energy to the charging pile.

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