Battery device, energy storage device, energy storage system, power utilization device and charging network

Abstract

The utility model discloses a battery device, an energy storage device, an energy storage system, a power utilization device and a charging network. The battery device comprises an energy unit, the energy unit comprises a shell and a bag-shaped single battery, and the bag-shaped single battery is located in the shell; the bag-shaped single battery comprises a bag-shaped shell, an electrode assembly and an electrode leading-out part; the electrode assembly is packaged in the bag-shaped shell, at least part of the electrode leading-out part is located in the bag-shaped shell to be connected with the electrode assembly, a packaging part is arranged at the end of the bag-shaped shell in the first direction, and at least part of the electrode leading-out part is exposed out of the packaging part; and the liquid collection structure is correspondingly arranged at the end part, along the first direction, of the bag-shaped single battery in the energy unit, and the liquid collection structure is positioned below the packaging part. According to the battery device provided by the embodiment of the invention, the influence caused by liquid leakage of the battery monomers can be relieved to a certain extent, so that the reliability and the safety of the battery device are improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and particularly to a battery device, an energy storage device, an energy storage system, an electric device, and a charging network. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] In the related art, a battery device may include a plurality of pouch battery cells. A pouch battery cell is a battery cell encapsulated in a soft shell, usually using an aluminum-plastic film as the shell material, and has the characteristics of light weight, thinness, and high energy density. However, for a pouch battery cell, the plastic-sealed positions of the electrode tabs on both sides are weak areas of the aluminum-plastic film shell, and are prone to breakage and leakage of liquid, causing potential safety hazards. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a battery device, an energy storage device, an energy storage system, an electric device, and a charging network, which can alleviate the problem of potential safety hazards caused by breakage and leakage of liquid at the plastic-sealed position of the electrode tab of the pouch battery cell.

[0005] In a first aspect, the present application provides a battery device. The battery device includes:

[0006] An energy unit, the energy unit including a housing and a pouch battery cell, the pouch battery cell being located inside the housing;

[0007] The pouch battery cell includes a pouch-shaped housing, an electrode assembly, and an electrode lead-out portion; the electrode assembly is encapsulated in the pouch-shaped housing, at least a part of the electrode lead-out portion is located inside the pouch-shaped housing to connect the electrode assembly, and a sealing portion is provided at an end of the pouch-shaped housing in a first direction, and at least a part of the electrode lead-out portion protrudes from the sealing portion;

[0008] A liquid collecting structure, the liquid collecting structure being correspondingly provided at an end of the pouch battery cell in the energy unit along the first direction, and the liquid collecting structure being located below the sealing portion.

[0009] In the technical solution of the embodiment of the present application, the liquid collecting structure is correspondingly provided at an end of the pouch battery cell in the energy unit along the first direction and is located below the sealing portion, so that the liquid collecting structure can collect the liquid leaked from the pouch battery cell due to the breakage of the sealing portion, and to a certain extent, can alleviate the influence caused by the liquid leakage of the pouch battery cell, thereby improving the reliability and safety of the battery device.

[0010] In some embodiments, the electrode lead-out portion includes a first electrode lead-out portion and a second electrode lead-out portion, and the first electrode lead-out portion and the second electrode lead-out portion are respectively located at two ends of the pouch-type battery cell along the first direction; the encapsulation portion includes a first encapsulation portion and a second encapsulation portion, the first encapsulation portion is correspondingly arranged with the first electrode lead-out portion, and at least a part of the first electrode lead-out portion exposes from the first encapsulation portion; the second encapsulation portion is correspondingly arranged with the second electrode lead-out portion, and at least a part of the second electrode lead-out portion exposes from the second encapsulation portion.

[0011] The liquid collection structure includes a first liquid collection structure and a second liquid collection structure. The first liquid collection structure corresponds to the first encapsulation portion along the first direction and is located below the first encapsulation portion; the second liquid collection structure corresponds to the second encapsulation portion along the first direction and is located below the second encapsulation portion.

[0012] In the above embodiments, the first liquid collection structure and the second liquid collection structure can collect the electrolyte leaked due to the breakage of the first encapsulation portion and the second encapsulation portion, and to a certain extent, can avoid problems such as system-level short circuit, corrosion, and even battery failure and sparking, thereby improving the reliability and safety of the battery device.

[0013] In some embodiments, the energy unit includes a plurality of the pouch-type battery cells placed in the housing. The two sides of the housing along the first direction have first openings. The battery device further includes two insulating members, and the two insulating members respectively cover the first openings on both sides. The first liquid collection structure and the second liquid collection structure are respectively arranged on the two insulating members.

[0014] In the above embodiments, the first liquid collection structure and the second liquid collection structure can be respectively arranged on the two insulating members. When the first encapsulation portion and the second encapsulation portion leak electrolyte, the electrolyte can be collected in time, and to a certain extent, problems such as system-level short circuit, corrosion, and even battery failure and sparking can be avoided, thereby improving the reliability and safety of the battery device.

[0015] In some embodiments, the battery device includes a box body. The housing further includes a second opening facing the inner bottom wall of the box body. There is an insulating colloid between the pouch-type battery cell and the inner bottom wall of the box body. At least a part of the insulating colloid penetrates through the second opening to insulatively connect the pouch-type battery cell and the inner bottom wall of the box body. The liquid collection structure includes a liquid collection groove, and the minimum distance between the bottom wall of the liquid collection groove and the inner bottom wall of the box body is less than the maximum distance between the upper surface of the insulating colloid and the inner bottom wall of the box body.

[0016] In the above embodiment, the minimum distance between the bottom wall of the liquid collecting tank and the bottom wall of the box body is smaller than the maximum distance between the upper surface of the insulating colloid and the bottom wall of the box body. When the electrolyte leaks, the electrolyte can eventually reach the lower liquid collecting tank, thereby collecting the leaked electrolyte.

[0017] In some embodiments, the electrode lead-out portion includes a first electrode lead-out portion and a second electrode lead-out portion, the first electrode lead-out portion and the second electrode lead-out portion are spaced apart and arranged at a first end portion of the pouch-shaped battery cell along the first direction, the packaging portion includes a first packaging portion located at the first end portion, and the first electrode lead-out portion and the second electrode lead-out portion are at least partially exposed from the first packaging portion;

[0018] The liquid collection structure includes a first liquid collection structure, and the first liquid collection structure corresponds to the first packaging portion along the first direction and is located below the first packaging portion.

[0019] In the above embodiment, the first liquid collecting structure can collect the electrolyte leaked due to damage of the first packaging part, that is, the first electrode lead-in part and the second electrode lead-in part can share the first liquid collecting structure, which can avoid system-level short circuit, corrosion, and even battery failure, ignition and other problems to a certain extent, thereby improving the reliability and safety of the battery device, while reducing the space requirement and material consumption for additionally setting up multiple liquid collecting structures, thereby optimizing the space utilization of the battery device.

[0020] In some embodiments, the liquid collecting structure includes a guide groove and a liquid storage portion, the guide groove is located below the packaging portion, the liquid storage portion is located on a side of the guide groove away from the pouch-shaped battery cell, and the guide groove is connected to the liquid storage portion.

[0021] In the above embodiments, combined with the guide groove and the liquid storage part, the liquid collection structure can more effectively guide and collect the electrolyte leaked when the bag-shaped battery cell packaging part is damaged, and to a certain extent can prevent the electrolyte from diffusing to other areas, thereby improving the safety and reliability of the battery device and optimizing space utilization.

[0022] In some embodiments, the battery device includes a detection member, at least a portion of which is located in the liquid collection structure, and the detection member is used to detect liquid in the liquid collection structure.

[0023] In the above embodiment, the detection element is at least partially located in the liquid collecting structure and is used to detect the electrolyte in the liquid collecting structure. This can ensure effective sensing of electrolyte leakage to a certain extent and transmit the detection results to the control system or alarm system, thereby increasing the safety and reliability of the battery device.

[0024] In some embodiments, a plurality of the pouch - type battery cells are arranged along a second direction, and the liquid - collecting structure includes a current - collecting channel. The current - collecting channel extends along the second direction so as to be located below the encapsulation parts of a plurality of the pouch - type battery cells at the same time. The second direction is perpendicular to the first direction.

[0025] In the above - mentioned embodiments, the current - collecting channel extends along the second direction so as to be located below the encapsulation parts of a plurality of the pouch - type battery cells at the same time, which can form a battery - cell module to improve the overall energy - storage capacity of the battery device. While meeting the energy demand, the current - collecting channel can collect the electrolyte leaked from the module, and to a certain extent, prevent the electrolyte from diffusing to other areas, thereby improving the safety and reliability of the battery device.

[0026] In some embodiments, the battery device includes a detecting member, and at least a part of the detecting member is located in the current - collecting channel. The detecting member is used to detect the liquid in the current - collecting channel.

[0027] In the above - mentioned embodiments, at least a part of the detecting member is located in the current - collecting channel and is used to detect the electrolyte in the current - collecting channel, which can, to a certain extent, ensure effectively sensing the leakage of the electrolyte and transmitting the detection result to the control system or the alarm system, thereby increasing the safety and reliability of the battery device.

[0028] In some embodiments, a concave part is provided on the bottom wall of the current - collecting channel, and the detecting member is arranged in the concave part.

[0029] In the above - mentioned embodiments, a concave part is provided on the bottom wall of the current - collecting channel, and the detecting member is arranged in the concave part, so that the leaked electrolyte can be concentrated in the concave part, thereby enabling the detecting member to more quickly and accurately sense the electrolyte.

[0030] In some embodiments, along the second direction, the bottom wall on at least one side of the concave part is inclined towards the concave part.

[0031] In the above - mentioned embodiments, along the second direction, the bottom wall on at least one side of the concave part is inclined towards the concave part, which can guide the electrolyte to flow into the concave part, thereby to a certain extent, improving the detection sensitivity of the electrolyte and accelerating the response time, and contributing to improving the overall safety and reliability of the battery device.

[0032] In some embodiments, the inclination angle of the bottom wall on any one side of the concave part along the second direction towards the concave part is R, where 0° < R ≤ 10°.

[0033] In the above - mentioned embodiments, the inclination angle R satisfies 0° < R ≤ 10°, which can, to a certain extent, ensure the collection efficiency of the electrolyte in different leakage scenarios, thereby improving the safety and reliability of the battery device. At the same time, it can, to a certain extent, avoid the problem that the thickness of the liquid - collecting structure in the third direction is relatively large when the inclination angle is greater than 10°.

[0034] In some embodiments, 5° ≤ R ≤ 10°.

[0035] In the above embodiments, the inclination angle R satisfies 5° ≤ R ≤ 10°, which can make the electrolyte flow to the concave part more quickly, reduce the residence time of the liquid in the current collecting channel, and can quickly accumulate the leaked electrolyte, thereby improving the electrolyte detection sensitivity and accelerating the response time to a certain extent, and contributing to improving the overall safety and reliability of the battery device. At the same time, it can avoid the problem that the thickness of the liquid collecting structure in the third direction is relatively large when the inclination angle is greater than 10° to a certain extent.

[0036] In some embodiments, the width of the current collecting channel is x, and 0.5 cm ≤ x ≤ 3 cm.

[0037] In the above embodiments, the width x of the current collecting channel satisfies 0.5 cm ≤ x ≤ 3 cm, which can ensure the collection efficiency of the electrolyte in different leakage scenarios to a certain extent, thereby improving the safety and reliability of the battery device. At the same time, it can avoid the problem that the size of the liquid collecting structure in the first direction is relatively large when the width x of the current collecting channel is greater than 3 cm to a certain extent.

[0038] In some embodiments, 0.5 ≤ x ≤ 1 cm.

[0039] In the above embodiments, the width x of the current collecting channel satisfies 0.5 ≤ x ≤ 1 cm, which can provide a flow path for the leaked electrolyte, and at the same time can reduce the space utilization and improve the compactness of the battery device. At the same time, it can make the liquid collecting structure occupy less space, which is beneficial to improving the compactness of the battery device.

[0040] In some embodiments, the depth of the current collecting channel is h, and 0 < h ≤ 1 cm.

[0041] In the above embodiments, the depth h of the current collecting channel satisfies 0 < h ≤ 1 cm, which can provide a flow path for the leaked electrolyte, and at the same time can ensure the collection efficiency of the electrolyte in different leakage scenarios to a certain extent, thereby improving the safety and reliability of the battery device.

[0042] In some embodiments, the battery device includes a battery management system, and the battery management system is electrically connected to the detection component, and the detection component is configured to: when detecting liquid leakage, send an alarm signal to the battery management system.

[0043] In the above embodiments, the battery management system is electrically connected to the detection component. When the detection component detects electrolyte leakage, it can timely provide alarm or feedback information to the battery management system, which is beneficial for the battery management system to take safety measures in time, such as controlling the bag-shaped battery cell with electrolyte leakage to cut off the power supply (stop charging, stop discharging), etc.

[0044] In some embodiments, the battery device further includes a liquid absorbent, and the liquid absorbent is located in the liquid collection structure.

[0045] In the above embodiments, the liquid absorbent is located in the liquid collection structure. When electrolyte leakage occurs in the battery device, it can ensure timely absorption of the electrolyte to a certain extent.

[0046] In some embodiments, the pouch-type battery cell is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

[0047] In the above embodiments, in the embodiment where the present application is configured as a lithium iron phosphate battery cell, the reliability of the pouch-type battery cell can be improved, and the cycle life of the pouch-type battery cell can be extended. In the embodiment where the present application is configured as a ternary lithium battery cell, the energy density of the pouch-type battery cell can be increased, and the cruising range can be increased. In the embodiment where the present application is configured as a solid-state pouch-type battery cell, not only the energy density can be increased, but also the reliability can be improved.

[0048] In a second aspect, the present application provides an energy storage device, which includes a plurality of the battery devices in any of the above embodiments, and the battery devices are used to store or provide electric energy.

[0049] In a third aspect, the present application provides an energy storage system, which includes a power conversion device and the energy storage device in the above embodiments, and the power conversion device is used to electrically connect a power generation device and the energy storage device.

[0050] In a fourth aspect, the present application provides an electrical device, which includes the battery device, the energy storage device, or the energy storage system in the above embodiments, and the battery device is used to store or provide electric energy.

[0051] In a fifth aspect, the present application provides a charging network, which includes a charging pile and the energy storage device or the energy storage system in the above embodiments, and the energy storage device is used to provide electric energy for the charging pile.

[0052] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0054] Figure 1 Schematic structural diagram of a vehicle according to some embodiments of the present application;

[0055] Figure 2 Exploded structural diagram of a battery device according to some embodiments of the present application;

[0056] Figure 3 Cross-sectional schematic diagram of a battery device according to some embodiments of the present application;

[0057] Figure 3a is Figure 3 Enlarged view of the partial A in

[0058] Figure 4 Another cross-sectional schematic diagram of a battery device according to some embodiments of the present application;

[0059] Figure 4a is Figure 4 Enlarged view of the partial B in

[0060] Figure 5 Schematic structural diagram of a battery device according to some embodiments of the present application;

[0061] Figure 6 Another schematic structural diagram of a battery device according to some embodiments of the present application;

[0062] Figure 7 Top view of a battery device according to some embodiments of the present application;

[0063] Figure 8 Another top view of a battery device according to some embodiments of the present application;

[0064] Figure 9 Another cross-sectional schematic diagram of a battery device according to some embodiments of the present application;

[0065] Figure 9a is Figure 9 Enlarged view of the partial C in

[0066] Figure 10 Another cross-sectional schematic diagram of a battery device according to some embodiments of the present application;

[0067] Figure 10a is Figure 10 Enlarged view of the partial D in

[0068] Figure 11 Another cross-sectional schematic diagram of a battery device according to some embodiments of the present application;

[0069] Figure 12 Schematic structural diagram of a pouch battery cell and a bus bar channel according to some embodiments of the present application;

[0070] Figure 13 Another schematic structural diagram of the pouch battery cell and the current collecting channel according to some embodiments of the present application;

[0071] Figure 14 Schematic module diagram of the energy storage system according to some embodiments of the present application;

[0072] Figure 15 Schematic module diagram of the charging network according to some embodiments of the present application.

[0073] The reference numerals in the specific embodiments are as follows:

[0074] Vehicle 1000, energy storage system 2000, charging network 3000, energy storage device 1, power conversion device 2, power generation device 3, charging pile 4, connector 5;

[0075] Battery device 100, controller 200, motor 300;

[0076] Box body 10, first part 11, second part 12, inner bottom wall 13, thermal management component 14;

[0077] Pouch battery cell 20, pouch housing 21, electrode lead-out part 22, encapsulation part 211, first electrode lead-out part 221, second electrode lead-out part 222, first encapsulation part 2111, second encapsulation part 2112;

[0078] Liquid collecting structure 30, current collecting channel 31, liquid collecting tank 32, diversion groove 33, liquid storage part 34, recess 311, first liquid collecting structure 301, second liquid collecting structure 302;

[0079] Insulating colloid 40;

[0080] Detection part 50;

[0081] Liquid absorbing part 60;

[0082] Energy unit 70, housing 71, first opening 72. Specific embodiments

[0083] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and thus are only examples and should not be used to limit the protection scope of the present application.

[0084] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0085] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0086] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0087] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0088] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0089] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0090] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0091] If there is no special instruction, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0092] If there is no special instruction, all technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0093] At present, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0094] In the application of electric vehicles, the structural design of the battery device is directly related to the service life and safety of the battery. The battery device may include a plurality of soft-pack battery cells. Compared with traditional hard-shell battery cells, soft-pack battery cells have the significant advantages of light weight and high energy density, which can improve the cruising range of the vehicle and reduce the overall weight. However, the soft-pack battery cells use aluminum plastic film as the outer shell material, and its overall mechanical strength is relatively low, showing high structural vulnerability during use.

[0095] In actual use, the inventor found that the plastic-sealed position of the pole ears on both sides of the soft-pack battery cell is a weak area of the structure of the soft-pack battery cell. This area is not only prone to breakage or cracking due to mechanical stress concentration, but may also cause liquid leakage inside the soft-pack battery cell. The leakage of the liquid will further cause system short-circuit, corrosion of connecting components, and even lead to battery failure or fire, seriously affecting the safety and service life of electric vehicles.

[0096] Based on the above considerations, in order to alleviate the problem of potential safety hazards caused by leakage of liquid from the plastic-sealed position of the tab of the pouch battery cell 20, the present application provides a liquid collecting structure 30. The liquid collecting structure 30 can collect, guide and isolate the liquid leaked from the pouch battery cell 20, thereby reducing the contact probability between the leaked liquid and other electronic components or connecting parts inside the battery device 100, and further improving the safety and reliability of the battery system.

[0097] The pouch battery cell of the present application can be applied to the battery device 100. The battery device 100 (Battery Apparatus) mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include a plurality of pouch battery cells 20, and the plurality of pouch battery cells 20 are connected in series, parallel or in a hybrid connection through a bus bar component. Hybrid connection means that there are both series and parallel connections between the plurality of pouch battery cells 20.

[0098] In some embodiments, the battery cell assembly (Battery Cell Assembly) is usually formed by arranging a plurality of pouch battery cells 20.

[0099] As an example, the battery cell assembly can be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of pouch battery cells 20 into an independent module. As an example, the battery module can be formed by bundling a plurality of pouch battery cells 20 with a cable tie.

[0100] In some embodiments, the battery device 100 can be a battery pack (battery Pack), and the battery pack includes a box body 10 and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body 10.

[0101] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body 10 by fixing the battery module in the box body 10.

[0102] As an example, the battery cell assembly can also be accommodated in the box body 10 by directly fixing a plurality of pouch battery cells 20 to the box body 10.

[0103] As an example, please refer to Figure 2 , the box body 10 may include a first part 11 and a second part 12. The first part 11 and the second part 12 are snapped together so that a closed space is formed inside the box body 10 to accommodate the battery cell assembly. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first part 11 can be a top cover or a bottom plate.

[0104] As an example, the box body 10 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body 10 to accommodate the battery cell assembly.

[0105] In some embodiments, the box body 10 may be part of the chassis structure of the vehicle 1000. For example, a part of the box body 10 may become at least a part of the floor of the vehicle 1000, or a part of the box body 10 may become at least a part of the cross beams and longitudinal beams of the vehicle 1000.

[0106] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using the pouch-type battery cell 20, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, power tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0107] For the convenience of description in the following embodiments, a vehicle 1000 is taken as an example of an electrical device in an embodiment of the present application.

[0108] It should be noted that the liquid collection structure 30 in the embodiments of the present application can collect the liquid leaked from the pouch-type battery cell 20. The liquid can be electrolyte, solvent between diaphragms, battery additive solution, or other liquids inside the pouch-type battery cell 20. For the convenience of description in the following embodiments, the liquid in an embodiment of the present application is taken as electrolyte as an example.

[0109] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be disposed at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0110] In some embodiments of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0111] In the battery device 100, there may be multiple cases 71. In one case 71, there may be multiple pouch-type battery cells 20. The multiple pouch-type battery cells 20 can be connected in series, parallel, or in a combined series-parallel connection. A combined series-parallel connection means that among the multiple pouch-type battery cells 20, there are both series and parallel connections. The multiple pouch-type battery cells 20 can be directly connected in series, parallel, or in a combined series-parallel connection together, and the whole formed by the multiple pouch-type battery cells 20 is accommodated in the case 71. The multiple pouch-type battery cells 20 in the multiple cases 71 are then connected in series, parallel, or in a combined series-parallel connection to form a whole and are accommodated in the box 10. The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for realizing the electrical connection between the multiple pouch-type battery cells 20.

[0112] In the embodiments of the present application, the pouch-type battery cell 20 can be a secondary battery, which means that after the pouch-type battery cell 20 discharges, the active material can be activated by charging and the pouch-type battery cell 20 can continue to be used.

[0113] The pouch-type battery cell 20 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0114] According to some embodiments of the present application, referring to Figures 3 to 11 , the embodiments of the present application provide a battery device 100. The battery device 100 includes an energy unit 70 and a liquid collection structure 30. The energy unit 70 includes a case 71 and a pouch-type battery cell 20, and the pouch-type battery cell 20 is located in the case 71. The pouch-type battery cell 20 includes a pouch-shaped case 21, an electrode assembly, and an electrode lead-out portion 22. The electrode assembly is encapsulated in the pouch-shaped case 21, and at least a part of the electrode lead-out portion 22 is located in the pouch-shaped case 21 to be connected to the electrode assembly. The pouch-shaped case 21 is provided with a sealing portion 211 at the end in the first direction (F1), and at least a part of the electrode lead-out portion 22 protrudes from the sealing portion 211. The liquid collection structure 30 is correspondingly provided at the end of the pouch-type battery cell 20 in the energy unit 70 along the first direction, and the liquid collection structure 30 is located below the sealing portion 211.

[0115] Specifically, the pouch-shaped case 21 is the external encapsulation structure of the pouch-type battery cell 20. Optionally, the pouch-shaped case 21 can be made of a multi-layer composite material, such as an aluminum-plastic film. The pouch-type battery cell 20 may include a sealing portion 211, and the sealing portion 211 is provided at the end of the pouch-shaped case 21 in the first direction. An opening, a hole, a groove, or a channel may be reserved in the sealing portion 211 so that at least a part of the electrode lead-out portion 22 can protrude from the sealing portion 211 and be connected to an external circuit. The electrode lead-out portion 22 and the sealing portion 211 can be connected by a heat-sealing or bonding process to seal the pouch-type battery cell 20.

[0116] The electrode assembly is the part in the pouch - type battery cell 20 responsible for the electrochemical reaction, which can achieve the storage and release of electrical energy. The electrode assembly may include a positive electrode, a negative electrode, an electrolyte, and a separator. The positive electrode may be composed of a positive - electrode active material (such as lithium nickel cobalt manganese oxide, lithium iron phosphate, etc.) coated on an aluminum - foil current collector. The negative electrode may be composed of a negative - electrode active material (such as graphite, silicon - carbon, etc.) coated on a copper - foil current collector. The electrolyte is a liquid or gel - like substance filled in the electrode assembly, which is used to provide an ion - conduction channel. The separator can be placed between the positive electrode and the negative electrode to prevent direct contact between the two, which may cause a short - circuit, while allowing ions to move freely in the electrolyte.

[0117] The electrode lead - out part 22 is the electrical connection end between the pouch - type battery cell 20 and the external circuit, which is responsible for transmitting the electrical energy inside the pouch - type battery cell 20 to external devices. The electrode lead - out part 22 may include a positive - electrode lead - out part and a negative - electrode lead - out part, which are respectively connected to the positive electrode and the negative electrode in the electrode assembly.

[0118] Please further combine Figures 3 to 4a and Figures 9 to 11 The liquid - collecting structure 30 is correspondingly arranged at the end of the pouch - type battery cell 20 in the energy unit 70 along the first direction and is located below the encapsulation part 211. The encapsulation part 211 is the position where the electrode lead - out part 22 is installed. There is a phenomenon of local stress concentration of materials, and its mechanical strength is relatively low. During long - term use or when the external environment changes, material aging, deformation, or sealing failure may occur, resulting in electrolyte leakage, causing system - level short - circuits, corrosion, and even battery failure, ignition, etc.

[0119] The liquid - collecting structure 30 is correspondingly arranged at the end of the pouch - type battery cell 20 in the energy unit 70 along the first direction and is located below the encapsulation part 211, which can collect the electrolyte leaked from the pouch - type battery cell 20 due to the damage of the encapsulation part 211. To a certain extent, it can avoid problems such as system - level short - circuits, corrosion, and even battery failure, ignition, etc., thereby improving the reliability and safety of the battery device 100.

[0120] According to some embodiments of the present application, optionally, please combine Figure 4 、 Figure 4a 、 Figure 10 and Figure 10a, the electrode lead-out part 22 includes a first electrode lead-out part 221 and a second electrode lead-out part 222. The first electrode lead-out part 221 and the second electrode lead-out part 222 are respectively located at both ends of the pouch-type battery cell 20 along the first direction. The encapsulation part 211 includes a first encapsulation part 2111 and a second encapsulation part 2112. The first encapsulation part 2111 is correspondingly arranged with the first electrode lead-out part 221, and at least part of the first electrode lead-out part 221 is exposed from the first encapsulation part 2111. The second encapsulation part 2112 is correspondingly arranged with the second electrode lead-out part 222, and at least part of the second electrode lead-out part 222 is exposed from the second encapsulation part 2112. The liquid collection structure 30 includes a first liquid collection structure 301 and a second liquid collection structure 302. The first liquid collection structure 301 corresponds to the first encapsulation part 2111 along the first direction and is located below the first encapsulation part 2111. The second liquid collection structure 302 corresponds to the second encapsulation part 2112 along the first direction and is located below the second encapsulation part 2112.

[0121] At both ends of the pouch-shaped housing 21 of the pouch-type battery cell 20 in the first direction, there are respectively provided a first encapsulation part 2111 and a second encapsulation part 2112. The first encapsulation part 2111 and the second encapsulation part 2112 can reserve openings, holes, grooves or channels, so that the first electrode lead-out part 221 can be exposed from the first encapsulation part 2111 and connected to an external circuit, and the second electrode lead-out part 222 can be exposed from the second encapsulation part 2112 and connected to an external circuit.

[0122] Correspondingly, the liquid collection structure 30 includes a first liquid collection structure 301 and a second liquid collection structure 302. The first liquid collection structure 301 is correspondingly arranged below the first encapsulation part 2111 along the first direction for collecting the electrolyte leaked due to the breakage of the first encapsulation part 2111. The second liquid collection structure 302 is correspondingly arranged below the second encapsulation part 2112 along the first direction for collecting the electrolyte leaked due to the breakage of the second encapsulation part 2112.

[0123] It can be understood that in this embodiment, the first electrode lead-out part 221 and the second electrode lead-out part 222 are respectively connected to the positive electrode and the negative electrode of the electrode assembly, and are respectively located at both ends of the pouch-type battery cell 20 along the first direction, which can shorten the current path, reduce the internal resistance, thereby improving the energy efficiency and power output of the pouch-type battery cell 20, and at the same time helping to disperse heat and improve the thermal management performance of the pouch-type battery.

[0124] The first liquid collection structure 301 and the second liquid collection structure 302 can collect the electrolyte leaked due to the breakage of the first encapsulation part 2111 and the second encapsulation part 2112, which can avoid problems such as system-level short circuit, corrosion, and even battery failure and sparking to a certain extent, thereby improving the reliability and safety of the battery device 100.

[0125] According to some embodiments of the present application, optionally, please refer to Figures 5 to 8 , the energy unit 70 includes a plurality of pouch - type battery cells 20 placed in a housing 71. The housing 71 has first openings 72 on both sides along a first direction. The battery device 100 further includes two insulating members (not shown), and the two insulating members respectively cover the first openings 72 on both sides. The first liquid - collecting structure 301 and the second liquid - collecting structure 302 are respectively disposed on the two insulating members.

[0126] Optionally, in one embodiment, the energy unit 70 may include a housing 71 and a plurality of pouch - type battery cells 20 placed in the housing 71. In one embodiment, the energy unit 70 may include a plurality of housings 71, and each housing 71 may place a plurality of pouch - type battery cells 20.

[0127] It can be understood that the housing 71 is a direct accommodating structure for the pouch - type battery cells 20, and an accommodating cavity is formed inside it for accommodating and protecting the pouch - type battery cells 20. The housing 71 can provide support and protection to prevent the pouch - type battery cells 20 from directly colliding with other components inside the box body 10 and being damaged. The material of the housing 71 may include but is not limited to metal materials.

[0128] The housing 71 has first openings 72 on both sides along the first direction. The first openings 72 allow the electrode lead - out portions 22 to expose from the housing 71, which is conducive to electrically connecting the electrode lead - out portions 22 to an external circuit or a busbar. Among them, the busbar is also called a bus bar, a bus bar or a current bus bar, which is a metal conductor component for electrical connection, and is usually used to connect multiple circuits or battery cells together in a battery module, a power system or an electronic device, so as to realize the functions of current transmission and current collection.

[0129] Since the busbar is usually connected to a plurality of pouch - type battery cells 20 or electrical devices, if the busbar is exposed to the outside without insulation protection, it may contact other electrical components, metal structures or conductive substances, resulting in current flowing through an unexpected path. Therefore, the battery device 100 further includes two insulating members, and the insulating members can effectively isolate the busbar from the external environment and prevent current from flowing through an unexpected path to a certain extent. The insulating members include but are not limited to plastic brackets, which can be used to support and fix the position of the busbar while isolating the busbar from the external environment.

[0130] After the electrode lead - out portions 22 expose from the first openings 72 of the housing 71, they can be connected to the busbar to realize the functions of current transmission and current collection. The insulating member can cover the first openings 72 to isolate the busbar and the external environment.

[0131] The first liquid collection structure 301 and the second liquid collection structure 302 can be respectively arranged on two insulating members. When electrolyte leakage occurs in the first encapsulation part 2111 and the second encapsulation part 2112, the electrolyte can be collected in time, which can, to a certain extent, avoid problems such as system-level short circuit, corrosion, and even battery failure and sparking, thereby improving the reliability and safety of the battery device 100.

[0132] According to some embodiments of the present application, optionally, please refer to Figures 3 to 4a , the battery device 100 includes a box body 10. The housing 71 further includes a second opening (not shown) facing the inner bottom wall 13 of the box body 10. There is an insulating colloid 40 between the pouch-type battery cell 20 and the inner bottom wall 13 of the box body 10, and at least a part of the insulating colloid 40 penetrates through the second opening to insulatively connect the pouch-type battery cell 20 and the inner bottom wall 13 of the box body 10. The liquid collection structure 30 includes a liquid collection tank 32, and the minimum distance between the bottom wall of the liquid collection tank 32 and the inner bottom wall 13 of the box body 10 is less than the maximum distance between the upper surface of the insulating colloid 40 and the inner bottom wall 13 of the box body 10.

[0133] The box body 10 is the main protection and accommodation structure of the entire battery device 100, and is a box body 10 that can provide protection, which can, to a certain extent, avoid the direct influence of the outside on the inside of the battery device 100. The inside of the box body 10 has an inner bottom wall 13. The inner bottom wall 13 can be used to support the pouch-type battery cell 20 and at the same time provide a stable structural foundation for the battery device 100.

[0134] The housing 71 includes a second opening facing the inner bottom wall 13 of the box body 10, that is, the housing 71 is provided with a second opening on the side along the third direction (F3) and facing the inner bottom of the box body 10. The pouch-type battery cell 20 can be placed in the housing 71 from the second opening. The third direction is perpendicular to the first direction. In the embodiment shown in the figure, the first direction is the horizontal direction, the third direction is the vertical direction, and the inner bottom wall 13 refers to the inner surface of the bottom of the box body 10. In one embodiment, the electrical device is a vehicle 1000. The first direction can correspond to the front-rear direction or the left-right direction of the vehicle 1000, and the third direction can correspond to the up-down direction of the vehicle 1000.

[0135] The pouch-type battery cell 20 and the inner bottom wall 13 of the box body 10 can be connected through the insulating colloid 40. The part of the insulating colloid 40 facing the pouch-type battery cell 20 penetrates through the second opening to connect the pouch-type battery cell 20 located in the housing 71, and the part facing the inner bottom wall 13 of the box body 10 is connected to the inner bottom wall 13 of the box body 10, so as to fix the pouch-type battery cell 20. The insulating colloid 40 can include but is not limited to thermal conductive glue, structural glue, ab glue, or black glue, etc.

[0136] The liquid collection structure 30 includes a liquid collection tank 32. The minimum distance N between the bottom wall of the liquid collection tank 32 and the inner bottom wall 13 of the box body 10 is less than the maximum distance M between the upper surface of the insulating colloid 40 and the inner bottom wall 13 of the box body 10. That is, in the third direction, the bottom wall of the liquid collection tank 32 is closer to the inner bottom wall 13 of the box body 10 than the upper surface of the insulating colloid 40. Since the upper surface of the insulating colloid 40 is connected to the bag-shaped battery cell 20, the bottom wall of the liquid collection tank 32 is closer to the inner bottom wall 13 of the box body 10 than the lower surface of the bag-shaped battery cell 20.

[0137] It can be understood that the bottom wall of the liquid collection tank 32 is closer to the inner bottom wall 13 of the box body 10 than the lower surface of the bag-shaped battery cell 20. When the electrolyte leaks, the liquid flows into the liquid collection tank 32 under the action of gravity, so that the electrolyte can effectively concentrate on the bottom of the liquid collection tank 32, thus ensuring the effectiveness of the liquid collection structure 30 to a certain extent.

[0138] The minimum distance between the bottom wall of the liquid collection tank 32 and the inner bottom wall 13 of the box body 10 is less than the maximum distance between the upper surface of the insulating colloid 40 and the inner bottom wall 13 of the box body 10. When the electrolyte leaks, the electrolyte can finally reach the lower-lying liquid collection tank 32, so as to realize the collection of the leaked electrolyte.

[0139] According to some embodiments of the present application, optionally, the electrode lead-out part 22 includes a first electrode lead-out part 221 and a second electrode lead-out part 222. The first electrode lead-out part 221 and the second electrode lead-out part 222 are arranged at intervals at the first end of the bag-shaped battery cell 20 along the first direction. The encapsulation part 211 includes a first encapsulation part 2111 located at the first end. At least part of the first electrode lead-out part 221 and the second electrode lead-out part 222 are exposed from the first encapsulation part 2111. The liquid collection structure 30 includes a first liquid collection structure 301. The first liquid collection structure 301 corresponds to the first encapsulation part 2111 along the first direction and is located below the first encapsulation part 2111.

[0140] At one end of the bag-shaped housing 21 of the bag-shaped battery cell 20 in the first direction, a first encapsulation part 2111 is provided. The first encapsulation part 2111 can reserve an opening, a hole, a groove or a channel, so that the first electrode lead-out part 221 and the second electrode lead-out part 222 can be exposed from the first encapsulation part 2111 and connected to an external circuit. The first electrode lead-out part 221 and the second electrode lead-out part 222 are insulated in the first encapsulation part 2111.

[0141] Correspondingly, the liquid collection structure 30 includes a first liquid collection structure 301. The first liquid collection structure 301 is correspondingly arranged below the first encapsulation part 2111 along the first direction, and is used for collecting the electrolyte leaked due to the breakage of the first encapsulation part 2111.

[0142] It can be understood that in this embodiment, the first electrode lead-out portion 221 and the second electrode lead-out portion 222 are respectively connected to the positive electrode and the negative electrode of the electrode assembly, and are located at the same end of the pouch-shaped battery cell 20, which can reduce the complexity of opening multiple packaging channels, reduce the complexity of production, and help to use space more efficiently.

[0143] The first liquid collecting structure 301 can collect the electrolyte leaked due to the damage of the first packaging part 2111, that is, the first electrode lead-out part 221 and the second electrode lead-out part 222 can share the first liquid collecting structure 301, which can avoid system-level short circuit, corrosion, and even battery failure, ignition and other problems to a certain extent, thereby improving the reliability and safety of the battery device 100, while reducing the space requirement and material consumption for the additional installation of multiple liquid collecting structures 30, thereby optimizing the space utilization of the battery device 100.

[0144] The first end portion may be any one of both end portions of the pouch-shaped battery cell 20 along the first direction.

[0145] According to some embodiments of the present application, optionally, please combine Figures 9 to 10a The liquid collecting structure 30 includes a guide groove 33 and a liquid storage portion 34. The guide groove 33 is located below the packaging portion 211. The liquid storage portion 34 is located on a side of the guide groove 33 away from the pouch-shaped battery cell 20, and the guide groove 33 is connected to the liquid storage portion 34.

[0146] The liquid collecting structure 30 may be provided with a guide groove 33, which is a channel or groove with a certain shape and is located below the packaging part 211 of the bag-shaped battery cell 20. The guide groove 33 can guide the electrolyte to flow toward the liquid storage part 34 after leakage, so as to more effectively collect the leaked electrolyte.

[0147] The liquid storage portion 34 is a storage area for accommodating electrolyte, and is located on a side of the guide groove 33 away from the pouch-shaped battery cell 20. The liquid storage portion 34 can accommodate and store the leaked electrolyte guided from the guide groove 33.

[0148] Since electrolyte leakage into the system may cause safety problems such as battery short circuit, corrosion, overheating, etc. Therefore, the leakage path of the electrolyte can be effectively controlled through the guide groove 33 and the liquid storage part 34, so that the electrolyte can flow into the liquid storage part 34 far away from the bag-shaped battery cell 20, which can prevent the leaked electrolyte from contacting other parts of the battery device 100 to a certain extent, reducing safety hazards.

[0149] The flow guiding groove 33 can be a channel with a certain slope or inclination to utilize gravity to guide the flow of the electrolyte. The flow guiding groove 33 is located below the encapsulation part 211, close to the bottom of the pouch - type battery cell 20, thereby facilitating the rapid flow of the electrolyte to the liquid collection structure 30 when leakage occurs. The shape of the flow guiding groove 33 can be linear, curved, or any other shape, which can specifically depend on the design requirements and spatial layout of the battery device 100.

[0150] The volume and shape of the liquid storage part 34 can be determined according to the electrolyte capacity of the battery device 100 and the expected amount of leakage.

[0151] Combined with the flow guiding groove 33 and the liquid storage part 34, the liquid collection structure 30 can more effectively guide and collect the electrolyte leaked when the encapsulation part 211 of the pouch - type battery cell 20 is damaged. To a certain extent, it can prevent the electrolyte from spreading to other areas, improve the safety and reliability of the battery device 100, and at the same time optimize the space utilization rate.

[0152] According to some embodiments of the present application, optionally, please refer to Figure 12 and Figure 13 , the battery device 100 further includes a detection member 50. At least a part of the detection member 50 is located within the liquid collection structure 30, and the detection member 50 is used to detect the electrolyte within the liquid collection structure 30.

[0153] The detection member 50 is a device used to monitor whether there is electrolyte accumulation within the liquid collection structure 30 and generate a signal according to the presence or absence of the electrolyte. The detection member 50 can be used to determine whether electrolyte leakage has occurred and provide alarm or feedback information to help the system take safety measures in a timely manner. Optionally, the detection member 50 can include a liquid level sensor.

[0154] At least a part of the detection member 50 is located within the liquid collection structure 30. Optionally, in some embodiments, as shown in Figure 12 and Figure 13 , the detection member 50 is directly installed inside the liquid collection structure 30, closely cooperating with the area in contact with the electrolyte to accurately sense the state of the electrolyte and respond to electrolyte changes in a timely manner. In some embodiments, the detection member 50 includes a probe. The probe passes through the outer wall of the liquid collection structure 30, and the probe enters the liquid collection structure 30 and remains in contact with the electrolyte to avoid complex internal integration and facilitate maintenance or replacement. In some embodiments, the detection member 50 is embedded in a certain part of the liquid collection structure 30 and combined with other components of the liquid collection structure 30 (such as the flow guiding groove 33, the liquid storage part 34, etc.) to effectively monitor the electrolyte without occupying too much space.

[0155] The number of the detection members 50 can be one or more. In some embodiments, multiple detection members 50 are distributed at different positions of the liquid collection structure 30 to ensure comprehensive monitoring of electrolyte leakage.

[0156] The detection member 50 is at least partially located within the liquid collection structure 30, and is used to detect the electrolyte within the liquid collection structure 30. To a certain extent, it can ensure the effective perception of electrolyte leakage, and transmit the detection result to the control system or the alarm system, thereby increasing the safety and reliability of the battery device 100.

[0157] According to some embodiments of the present application, optionally, please refer to Figures 2 to 4a 、 Figures 9 to 10a , a plurality of pouch-type battery cells 20 are arranged along the second direction (F2). The liquid collection structure 30 includes a current collecting channel 31, and the current collecting channel 31 extends along the second direction so as to be located below the encapsulation parts 211 of the plurality of pouch-type battery cells 20 at the same time. The second direction is perpendicular to the first direction.

[0158] In some embodiments, the electrical device is a vehicle 1000. The first direction corresponds to one of the front-back direction and the left-right direction of the vehicle 1000, and the second direction corresponds to the other.

[0159] It can be understood that a plurality of pouch-type battery cells 20 are arranged along the second direction to form a battery cell module, and the size of the battery cell module along the second direction corresponds to the size of the current collecting channel 31 along the second direction.

[0160] It should be noted that the battery cell module may correspond to one or more current collecting channels 31. In some embodiments, one battery cell module corresponds to one current collecting channel 31, and the size of one battery cell module along the second direction corresponds to the size of the current collecting channel 31 along the second direction. In some embodiments, one battery cell module corresponds to a plurality of current collecting channels 31, and the size of one battery cell module along the second direction corresponds to the sum of the sizes of the plurality of current collecting channels 31 along the second direction. Each current collecting channel 31 may correspond to at least one pouch-type battery cell 20. By way of example, each current collecting channel 31 corresponds to 4 pouch-type battery cells 20.

[0161] The current collecting channel 31 is located below the encapsulation parts 211 of the plurality of pouch-type battery cells 20. When the encapsulation part 211 of at least one pouch-type battery cell 20 is damaged, the leaked electrolyte can be collected into the current collecting channel 31 under the action of gravity.

[0162] It can be understood that in some embodiments, the liquid collecting tank 32 extends along the second direction to be located below the encapsulation part 211 of the plurality of pouch-type battery cells 20, thereby forming a current collecting channel 31. In the current collecting channel 31, the electrolyte leaked from the plurality of pouch-type battery cells 20 can flow within the current collecting channel 31. In some embodiments, the liquid storage space provided in the liquid storage part 34 extends along the second direction to be located below the encapsulation part 211 of the plurality of pouch-type battery cells 20, thereby forming a current collecting channel 31. In the current collecting channel 31, the electrolyte leaked from the plurality of pouch-type battery cells 20 can flow within the current collecting channel 31.

[0163] Optionally, the current collecting channel 31 may not surround, semi-surround (such as Figure 4 and Figure 4a ) or fully surround (such as Figure 3 and Figure 3a ) the encapsulation part 211. The lower the degree of surrounding, the lighter the weight and the lower the cost of the current collecting channel 31. The higher the degree of surrounding, the higher the structural strength of the current collecting channel 31. Those skilled in the art can determine the degree of surrounding of the current collecting channel 31 surrounding the encapsulation part 211 according to actual needs. The shape of the current collecting channel 31 includes but is not limited to semi-cylindrical, irregular polygon, rectangle, triangle, etc. Optionally, the current collecting channel 31 fully surrounds the encapsulation part 211 and has a semi-cylindrical shape.

[0164] That the current collecting channel 31 does not surround the encapsulation part 211 may mean that in the first direction, the projection of the current collecting channel 31 does not overlap with the projection of the encapsulation part 211. That the current collecting channel 31 semi-surrounds the encapsulation part 211 may mean that in the first direction, the projection of the current collecting channel 31 overlaps at least partially with the projection of the encapsulation part 211, and in the third direction, in the direction away from the inner bottom wall 13 of the box body 10, the projection of the current collecting channel 31 does not overlap with the projection of the encapsulation part 211. That the current collecting channel 31 fully surrounds the encapsulation part 211 may mean that in the first direction, the projection of the current collecting channel 31 covers the projection of the encapsulation part 211, and in the third direction, the projection of the current collecting channel 31 covers the projection of the encapsulation part 211.

[0165] The current collecting channel 31 extends along the second direction to be simultaneously located below the encapsulation parts 211 of the plurality of pouch-type battery cells 20, which can form a battery cell module to increase the overall energy storage capacity of the battery device 100. While meeting the energy demand, the current collecting channel 31 can collect the electrolyte leaked from the module, and to a certain extent, can prevent the electrolyte from spreading to other areas, improving the safety and reliability of the battery device 100.

[0166] According to some embodiments of the present application, optionally, please refer to Figure 12 and Figure 13, the battery device 100 further includes a detecting member 50, at least a part of the detecting member 50 is located in the current collecting channel 31, and the detecting member 50 is used to detect the liquid in the current collecting channel 31.

[0167] The detecting member 50 is a device for monitoring whether there is electrolyte accumulation in the current collecting channel 31 and generating a signal according to the presence or absence of the electrolyte. The detecting member 50 can be used to judge whether electrolyte leakage has occurred and provide alarm or feedback information to help the system take safety measures in time. Optionally, the detecting member 50 may include a liquid level sensor.

[0168] At least a part of the detecting member 50 is located in the current collecting channel 31. Optionally, in some embodiments, the detecting member 50 is directly installed inside the current collecting channel 31 and closely cooperates with the area in contact with the electrolyte to accurately sense the state of the electrolyte and respond to electrolyte changes in time. In some embodiments, the detecting member 50 includes a probe, the probe passes through the outer wall of the current collecting channel 31, and the probe can enter the current collecting channel 31 to keep in contact with the electrolyte, so as to avoid complex internal integration and facilitate maintenance or replacement. In some embodiments, the detecting member 50 is embedded in a certain part of the current collecting channel 31 and combined with other components of the current collecting channel 31 to effectively monitor the electrolyte without occupying too much space.

[0169] The number of the detecting members 50 can be one or more. In some embodiments, a plurality of detecting members 50 are distributed at different positions of the current collecting channel 31 to ensure comprehensive monitoring of electrolyte leakage.

[0170] At least a part of the detecting member 50 is located in the current collecting channel 31 and is used to detect the electrolyte in the current collecting channel 31, which can ensure to a certain extent to effectively sense the electrolyte leakage and transmit the detection result to the control system or the alarm system, increasing the safety and reliability of the battery device 100.

[0171] According to some embodiments of the present application, optionally, please combine Figure 12 and Figure 13 , a recess 311 is provided on the bottom wall of the current collecting channel 31, and the detecting member 50 is arranged in the recess 311.

[0172] When the electrolyte of the pouch-shaped battery cell 20 leaks, the recess 311 can collect more leaked electrolyte, and the detecting member 50 in the recess 311 can more quickly sense the electrolyte leakage and transmit the detection result to the control system or the alarm system.

[0173] A recess 311 is provided on the bottom wall of the current collecting channel 31, and the detecting member 50 is arranged in the recess 311, so that the leaked electrolyte can be concentrated in the recess 311, so that the detecting member 50 can more quickly and accurately sense the electrolyte.

[0174] According to some embodiments of the present application, optionally, please refer to Figure 12 and Figure 13 , along the second direction, the bottom wall of at least one side of the recess 311 is inclined towards the recess 311.

[0175] Please refer to Figure 12 , in one embodiment, along the second direction, the bottom walls of both sides of the recess 311 are inclined towards the recess 311. Please refer to Figure 13 , in some embodiments, the bottom wall of one side of the recess 311 is inclined towards the recess 311.

[0176] It can be understood that, along the second direction, the bottom wall of at least one side of the recess 311 being inclined towards the recess 311 can make the recess 311 be at the lowest position of the bottom wall of the confluence channel 31. When the electrolyte of the pouch-type battery cell 20 leaks, the electrolyte can accumulate in the recess 311 under the action of gravity, so that the detection member 50 can detect the leakage of the electrolyte more quickly.

[0177] Along the second direction, the bottom wall of at least one side of the recess 311 being inclined towards the recess 311 can guide the electrolyte to flow to the recess 311, thereby improving the electrolyte detection sensitivity and accelerating the response time to a certain extent, which helps to improve the overall safety and reliability of the battery device 100.

[0178] According to some embodiments of the present application, optionally, please refer to Figure 12 and Figure 13 , the inclination angle of the bottom wall of any one side of the recess 311 along the second direction towards the recess 311 is R, 0° < R ≤ 10°.

[0179] The magnitude of the inclination angle R affects the direction and speed of liquid flow. A smaller inclination angle R means that the bottom wall is relatively flat and the liquid flows slowly; a larger inclination angle R will cause the liquid to converge towards the recess 311 more quickly.

[0180] It can be understood that those skilled in the art can determine the inclination angle R by comprehensively considering factors such as the volume or space requirements of the battery device 100, and the present application does not make specific limitations.

[0181] In some examples, the inclination angle R = 0.5°, 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10° or other values where 0° < R ≤ 10°.

[0182] The inclination angle R satisfying 0° < R ≤ 10° can ensure the collection efficiency of the electrolyte in different leakage scenarios to a certain extent, thereby improving the safety and reliability of the battery device 100. At the same time, it can avoid the problem that the thickness of the liquid collection structure 30 in the third direction is relatively large when the inclination angle is greater than 10° to a certain extent.

[0183] According to some embodiments of the present application, optionally, in combination with Figure 12 and Figure 13 , 5° ≤ R ≤ 10°.

[0184] In some examples, the inclination angle R = 5°, 6°, 7°, 8°, 9°, 10° or other values where 5° ≤ R ≤ 10°.

[0185] When the inclination angle R satisfies 5° ≤ R ≤ 10°, the electrolyte can flow more quickly towards the recess 311, reducing the residence time of the liquid in the current collecting channel 31, enabling the leakage electrolyte to accumulate quickly, thereby improving the electrolyte detection sensitivity and accelerating the response time to a certain extent, which helps to improve the overall safety and reliability of the battery device 100. At the same time, it can avoid to a certain extent the problem that the thickness of the liquid collecting structure 30 in the third direction is relatively large when the inclination angle is greater than 10°.

[0186] In some embodiments, the battery device 100 includes a plurality of detection members 50, and a plurality of recesses 311 are provided on the bottom wall of the current collecting channel 31. The plurality of detection members 50 are correspondingly arranged in different recesses 311. The bottom wall on both sides or one side of each recess 311 is inclined towards the recess 311. The inclination angle of the bottom wall on any one side of each recess 311 along the second direction towards the recess 311 can be equal or unequal.

[0187] According to some embodiments of the present application, optionally, in combination with Figures 3 to 4a , Figures 9 to 10a , the width of the current collecting channel 31 is x, and 0.5 cm ≤ x ≤ 3 cm.

[0188] The size of the width x of the current collecting channel 31 affects the liquid flow velocity. A smaller width x of the current collecting channel 31 means that the resistance suffered by the electrolyte when flowing in the current collecting channel 31 is greater; a larger width x of the current collecting channel 31 has a smaller resistance when flowing in the current collecting channel 31, enabling the liquid to converge towards the recess 311 more quickly.

[0189] It can be understood that those skilled in the art can determine the width x of the current collecting channel 31 by comprehensively considering the volume or space requirements of the battery device 100, and the present application does not make specific limitations.

[0190] In some examples, the width x of the current collecting channel 31 = 0.5 cm, 1 cm, 1.5 cm, 2 cm, 2.5 cm, 3 cm or other values where 0.5 cm ≤ x ≤ 3 cm.

[0191] The width x of the current collecting channel 31 satisfies 0.5 cm ≤ x ≤ 3 cm, which can ensure the collection efficiency of the electrolyte to a certain extent under different leakage scenarios, thereby improving the safety and reliability of the battery device 100. At the same time, it can avoid to a certain extent the problem that the size of the liquid collecting structure 30 in the first direction is large when the width x of the current collecting channel 31 is greater than 3 cm.

[0192] According to some embodiments of the present application, optionally, please combine Figures 3 to 4a 、 Figures 9 to 10a , 0.5 ≤ x ≤ 1 cm.

[0193] In some examples, the width x of the current collecting channel 31 = 0.5 cm, 0.6 cm, 0.7 cm, 0.8 cm, 0.9 cm, 1 cm or other values where 0.5 cm ≤ x ≤ 1 cm.

[0194] In practical applications, the leakage amount of the electrolyte is often small. The width x of the current collecting channel 31 satisfying 0.5 ≤ x ≤ 1 cm can provide a flow path for the leaked electrolyte, and at the same time can reduce space utilization and improve the compactness of the battery device 100. At the same time, it can make the liquid collecting structure 30 occupy less space, which is beneficial to improving the compactness of the battery device 100.

[0195] According to some embodiments of the present application, optionally, please combine Figures 3 to 4a 、 Figures 9 to 10a , the depth of the current collecting channel 31 is h, 0 < h ≤ 1 cm.

[0196] The size of the depth h of the current collecting channel 31 affects the liquid flow velocity. A smaller depth h of the current collecting channel 31 means that the resistance suffered by the electrolyte when flowing in the current collecting channel 31 is larger; a larger depth h of the current collecting channel 31 has a smaller resistance when flowing in the current collecting channel 31, making the liquid converge towards the concave portion 311 more quickly.

[0197] It can be understood that the width x and the depth h of the current collecting channel 31 jointly define the volume of the channel space corresponding to the current collecting channel 31. The larger the width x, the larger the volume of the channel space, and the smaller the resistance suffered by the electrolyte when flowing in the current collecting channel 31; the larger the depth h, the larger the volume of the channel space, and the smaller the resistance suffered by the electrolyte when flowing in the current collecting channel 31.

[0198] It can be understood that those skilled in the art can determine the depth h of the current collecting channel 31 by comprehensively considering the volume or space requirements of the battery device 100, and the present application does not make specific limitations.

[0199] The depth h of the current collecting channel 31 satisfies 0 < h ≤ 1 cm, which can provide a flow path for the leaked electrolyte, and can ensure the collection efficiency of the electrolyte in different leakage scenarios to a certain extent, thereby improving the safety and reliability of the battery device 100.

[0200] In some examples, the depth h of the current collecting channel 31 is 0.1 cm, 0.2 cm, 0.3 cm, 0.4 cm, 0.5 cm, 0.6 cm, 0.7 cm, 0.8 cm, 0.9 cm, 1 cm, or other values where 0 < h ≤ 1 cm. In one example, the depth h of the current collecting channel 31 is 0.5 cm.

[0201] In some embodiments, the distance between the bottom wall of the current collecting channel 31 facing the side of the pouch battery cell 20 and the electrode lead-out portion 22 is y, where 0 ≤ y ≤ 0.5 cm.

[0202] The smaller y is, the closer the bottom wall of the current collecting channel 31 is to the side of the pouch battery cell 20 and the electrode lead-out portion 22, that is, the closer the current collecting channel 31 is to the easily damaged encapsulation portion 211, so that the leaked electrolyte can flow into the current collecting channel 31 more quickly.

[0203] In some examples, the distance y is 0 cm, 0.1 cm, 0.2 cm, 0.3 cm, 0.4 cm, 0.5 cm, or other values where 0 ≤ y ≤ 0.5 cm. In one example, y = 0 cm.

[0204] According to some embodiments of the present application, optionally, the battery device 100 includes a battery management system, and the battery management system is electrically connected to the detection component 50, and the detection component 50 is configured to: when detecting electrolyte leakage, send an alarm signal to the battery management system.

[0205] The Battery Management System (BMS) is a management system in the battery device 100 for monitoring, managing, and protecting the pouch battery cell 20. It uses a series of sensors, control algorithms, and hardware devices to ensure that the pouch battery cell 20 operates under safe and reliable working conditions, and to avoid damage or safety accidents of the pouch battery cell 20 caused by overcharging, over-discharging, voltage imbalance, overheating, etc.

[0206] The detection component 50 is a device in the battery device 100 that can be used to sense and detect electrolyte leakage or other abnormal conditions. It uses devices such as sensors and detectors to monitor the leakage situation of the electrolyte in real time, and sends an alarm signal to the battery management system when leakage occurs.

[0207] The battery management system is electrically connected to the detection component 50. When the detection component 50 detects electrolyte leakage, it can promptly provide alarm or feedback information to the battery management system, which is conducive to the battery management system taking timely safety measures, such as controlling the power-off (stopping charging and discharging) of the bag-shaped battery cell 20 where electrolyte leakage occurs, etc.

[0208] According to some embodiments of the present application, optionally, please refer to Figure 11 , the battery device 100 further includes a liquid absorption component 60, and the liquid absorption component 60 is located in the liquid collection structure 30.

[0209] The liquid absorption component 60 is a component capable of absorbing the leaked electrolyte and can be made of a material with strong water absorption. When electrolyte leakage occurs in the battery device 100, the liquid absorption component 60 can quickly absorb the leaked electrolyte, thereby reducing the range of electrolyte leakage and avoiding problems such as system-level short circuits, corrosion, battery failure, and sparking caused by electrolyte leakage to a certain extent.

[0210] The liquid absorption component 60 includes, but is not limited to, non-woven fabric, foam, resin, etc. Optionally, the liquid absorption component 60 includes foam.

[0211] Optionally, in one embodiment, as Figure 11 shown, the liquid absorption component 60 can be attached to the inner side wall of the box body 10. Optionally, in one implementation manner, the liquid absorption component 60 and the inner side wall of the box body 10 can be arranged at intervals.

[0212] The liquid absorption component 60 is located in the liquid collection structure 30. When electrolyte leakage occurs in the battery device 100, it can ensure the timely absorption of electrolyte to a certain extent.

[0213] In some embodiments, please refer to Figure 2 and Figure 11 , a plurality of the bag-shaped battery cells 20 are arranged along the second direction. The battery device 100 further includes a liquid absorption component 60, and the liquid absorption component 60 extends along the second direction to be located below the encapsulation parts 211 of the plurality of bag-shaped battery cells 20 at the same time. The second direction is perpendicular to the first direction.

[0214] It can be understood that a plurality of bag-shaped battery cells 20 are arranged along the second direction to form a battery cell module, and the size of the battery cell module along the second direction corresponds to the size of the liquid absorption component 60 along the second direction.

[0215] It should be noted that the battery cell module can correspond to one or more liquid absorption members 60. In some embodiments, the battery cell module corresponds to one liquid absorption member 60, and the dimension of the battery cell module in the second direction corresponds to the dimension of the liquid absorption member 60 in the second direction. In some embodiments, the battery cell module corresponds to a plurality of liquid absorption members 60, and the dimension of the battery cell module in the second direction corresponds to the sum of the dimensions of the plurality of liquid absorption members 60 in the second direction. Each liquid absorption member 60 can correspond to at least one pouch-type battery cell 20.

[0216] The liquid absorption member 60 is located below the encapsulation portion 211 of the plurality of pouch-type battery cells 20. When the encapsulation portion 211 of at least one pouch-type battery cell 20 is damaged, the leaked electrolyte can flow to the liquid absorption member 60 to be absorbed by the liquid absorption member 60.

[0217] The battery device 100 includes a liquid absorption member 60. The plurality of pouch-type battery cells 20 are arranged in the second direction. The liquid absorption member 60 extends in the second direction to be located below the encapsulation portions 211 of the plurality of pouch-type battery cells 20 at the same time, and a battery cell module can be formed to improve the overall energy storage capacity of the battery device 100. While meeting the energy demand, the leaked electrolyte of the battery cell module is absorbed, which can prevent the electrolyte from spreading to other areas to a certain extent and improve the safety and reliability of the battery device 100.

[0218] In some embodiments, as Figure 11 shown, the width of the liquid absorption member 60 is a, and 0.5 cm ≤ a ≤ 3 cm.

[0219] The size of the width a of the liquid absorption member 60 affects the absorption capacity of the liquid absorption member 60. A smaller width a of the liquid absorption member 60 means that the amount of electrolyte that the liquid absorption member 60 can absorb is limited; a larger width a of the liquid absorption member 60 can absorb more electrolyte when the liquid absorption member 60 absorbs the electrolyte.

[0220] It can be understood that those skilled in the art can determine the width a of the liquid absorption member 60 by comprehensively considering factors such as the volume or space requirements of the battery device 100, and the present application does not make specific limitations.

[0221] In some examples, the width a of the liquid absorption member 60 = 0.5 cm, 1 cm, 1.5 cm, 2 cm, 2.5 cm, 3 cm, or other values where 0.5 cm ≤ a ≤ 3 cm.

[0222] When the width a of the liquid absorption member 60 satisfies 0.5 cm ≤ a ≤ 3 cm, the absorption efficiency of the electrolyte in different leakage scenarios can be ensured to a certain extent, thereby improving the safety and reliability of the battery device 100.

[0223] In some embodiments, as Figure 11 shown, 1 cm ≤ a ≤ 2 cm.

[0224] In some examples, the width a of the liquid absorption member 60 is 1 cm, 1.1 cm, 1.2 cm, 1.3 cm, 1.4 cm, 1.5 cm, 1.6 cm, 1.7 cm, 1.8 cm, 1.9 cm, 2 cm or other values satisfying 1 cm ≤ a ≤ 2 cm.

[0225] The width x satisfies 0.5 ≤ x ≤ 1 cm, which can enable the liquid absorption member 60 to absorb more electrolyte, while reducing space utilization and improving the compactness of the battery device 100.

[0226] In some embodiments, as Figure 11 shown, the distance between the side of the liquid absorption member 60 facing the pouch-type battery cell 20 and the electrode lead-out portion 22 is b, where 0 ≤ b ≤ 0.5 cm. In one example, b = 0.

[0227] The smaller b is, the closer the side of the liquid absorption member 60 facing the pouch-type battery cell 20 is to the electrode lead-out portion 22, that is, the closer the liquid absorption member 60 is to the encapsulation portion 211 that is prone to breakage, so that the leaked electrolyte can be absorbed by the liquid absorption member 60 more quickly.

[0228] In some examples, the distance b = 0 cm, 0.1 cm, 0.2 cm, 0.3 cm, 0.4 cm, 0.5 cm or other values where 0 ≤ b ≤ 0.5 cm.

[0229] In some embodiments, optionally, please refer to Figures 3 to 4a , Figures 9 to 11 , the inner bottom wall 13 of the box body 10 is provided with a thermal management component 14.

[0230] The thermal management component 14 can provide a channel for the flow of the cooling fluid, and the cooling fluid includes but is not limited to cooling water or coolant. The heat of the pouch-type battery cell 20 can be transferred to the inner bottom wall 13 through the insulating colloid 40 and the housing 71. When the cooling fluid flows, it can take away the heat transferred by the insulating colloid 40 and the housing 71, achieving the purpose of dissipating heat from the pouch-type battery cell 20. In the battery device 100, the thermal management component 14 can be arranged in an area close to the pouch-type battery cell 20 to perform effective thermal management through the cooling fluid when the pouch-type battery cell 20 generates heat during operation, helping to keep the temperature of the battery device 100 within a safe range and avoid overheating.

[0231] The inner bottom wall 13 is provided with the thermal management component 14, which can provide a cooling path, so that the heat generated by the pouch-type battery cell 20 can be quickly taken away, maintaining the pouch-type battery cell 20 within a suitable temperature range, thereby helping to avoid problems such as battery performance degradation, overheating, and even thermal runaway caused by too high temperature.

[0232] In some embodiments, the liquid collecting structure 30 and the inner bottom wall 13 of the box body 10 may be integrally formed or connected by a connection method well-known to those skilled in the art.

[0233] According to some embodiments of the present application, the pouch-type battery cell 20 is any one of a lithium iron phosphate battery cell, a ternary lithium battery cell, and a solid-state battery cell.

[0234] That is to say, in some embodiments, the pouch-type battery cell 20 is configured as a lithium iron phosphate battery, in some embodiments, the pouch-type battery cell 20 is configured as a ternary lithium battery cell, and in some embodiments, the pouch-type battery cell 20 is configured as a solid-state battery cell.

[0235] Among them, the solid-state battery cell may be, but is not limited to, a polymer solid-state battery cell, an oxide solid-state battery cell, a sulfide solid-state battery cell, a halide solid-state battery cell, and the like. The solid-state battery cell may also be a semi-solid-state battery cell or a full-solid-state battery cell.

[0236] In the above technical solution, in the embodiments where the present application is configured as a lithium iron phosphate battery cell, the reliability of the pouch-type battery cell can be improved, and the cycle life of the pouch-type battery cell can be extended. In the embodiments where the present application is configured as a ternary lithium battery cell, the energy density of the pouch-type battery cell can be increased and the cruising range can be increased. In the embodiments where the present application is configured as a solid-state pouch-type battery cell, not only the energy density can be increased, but also the reliability can be improved.

[0237] According to some embodiments of the present application, when the pouch-type battery cell 20 is a lithium iron phosphate (LiFeO4) battery cell, in the positive electrode material of the pouch-type battery cell 20, the dosage ratio of the positive electrode active material, the positive electrode binder, and the positive electrode conductive agent is 96:(1-3):(1-3); when the pouch-type battery cell 20 is a ternary lithium battery cell, and in the positive electrode material of the pouch-type battery cell 20, the dosage ratio of the positive electrode active material, the positive electrode binder, and the positive electrode conductive agent is 96:(2-3):(1-2).

[0238] It can be understood that when the pouch-type battery cell 20 is a lithium iron phosphate battery cell, in the positive electrode material of the pouch-type battery cell 20, the proportion of the positive electrode active material in the total weight of the positive electrode material is 96 parts, the proportion of the binder in the total weight of the positive electrode material is 1-3 parts (for example, it may include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.), and the proportion of the conductive agent in the total weight of the positive electrode material is 1-3 parts (for example, it may include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.).

[0239] Exemplarily, when the pouch cell monomer 20 is a lithium iron phosphate battery monomer, the positive electrode active material is LFP (which may refer to LiFePO4, i.e., lithium iron phosphate), the binder can be PVDF (polyvinylidene fluoride), and the conductive agent can be conductive carbon black. Among them, the ratio of LFP:PVDF:conductive carbon black can be 96:2:2. That is to say, the total weight of the positive electrode active material is divided into 100 parts, LFP accounts for 96 parts, PVDF accounts for 2 parts, and conductive carbon black also accounts for 2 parts. Among them, the weight unit of the positive electrode active material can be grams.

[0240] When the pouch cell monomer 20 is a ternary battery monomer, in the positive electrode material of the pouch cell monomer 20, the proportion of the positive electrode active material in the total weight of the positive electrode material is 96 parts, the proportion of the binder in the total weight of the positive electrode material is 2 - 3 parts (for example, it can include but is not limited to 2, 2.2, 2.5, 2.8, 3, etc.), and the proportion of the conductive agent in the total weight of the positive electrode material is 1 - 2 parts (for example, it can include but is not limited to 1, 1.2, 1.5, 1.8, 2, etc.). Among them, the ternary battery monomer can be but is not limited to lithium nickel cobalt manganese oxide series, lithium nickel cobalt aluminate series, etc.

[0241] Exemplarily, the ternary material of the ternary battery monomer can be the eighth series LiNi 0.8 Co 0.1 Mn 0.1 O2, and the weight ratio of the positive electrode active material, the binder, and the conductive agent is 96:2.5:1.5. That is to say, the total weight of the positive electrode material is divided into 100 parts, and the eighth series LiNi 0.8 Co 0.1 Mn 0.1 O2 accounts for 96 parts, the proportion of the binder is 2.5 parts, and the proportion of the conductive agent is 1.5 parts.

[0242] In the above technical solution, when the pouch battery cell 20 is a lithium iron phosphate battery cell, a high proportion of the positive electrode active material means that more substances capable of undergoing electrochemical reactions can be accommodated within a limited electrode assembly, which is beneficial to increasing the capacity and energy density of the battery device 100. This enables the lithium iron phosphate battery cell to output a higher amount of electricity while being relatively small in volume and weight, meeting application scenarios with certain requirements for energy density. Using the above ranges for the amounts of the binder and the conductive agent can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device 100. When the pouch battery cell 20 is a ternary battery cell, due to the relatively complex structure and surface properties of the ternary material itself, using the above dosage ratios of the positive electrode active material, the binder, and the conductive agent is beneficial to ensuring good adhesion between the positive electrode active material particles and between the active material and the current collector, thereby improving the mechanical stability and integrity of the electrode assembly, reducing the risk of shedding of the active material and electrode pulverization during charge and discharge, and extending the cycle life of the battery device 100.

[0243] According to some embodiments of the present application, the present application further provides an energy storage device 1. The energy storage device 1 includes the battery device 100 described in any of the above solutions, and the battery device 100 is used to store or provide electrical energy.

[0244] The energy storage device 1 includes one or more battery clusters to increase the voltage and capacity of the energy storage device 1. The battery cluster may include a plurality of battery devices 100, and the plurality of battery devices 100 are connected in series through a busbar component to increase the voltage of the energy storage device 1. When the energy storage device 1 includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device 1. Among them, the definition of the battery device 100 is as described above and will not be elaborated here.

[0245] The energy storage device 1 can be used in an energy storage power station, a wind power generation system, a solar power generation system, a mobile power system, or a temporary power supply system, etc. The energy storage device 1 can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device 1 can store electrical energy during low electricity consumption periods and provide electrical energy to relevant users or electrical equipment during high electricity consumption periods. The energy storage system 2000 provided by the embodiments of the present application can be any power system that requires the use of the energy storage device 1.

[0246] In some embodiments, the energy storage device 1 is an energy storage container or an energy storage cabinet.

[0247] In some embodiments, the energy storage device 1 may include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0248] In some embodiments, the energy storage device 1 may include modules such as a thermal management module, a main control module, a total control module, a power distribution module, and a fire protection module.

[0249] As an example, the thermal management module may include a liquid cooling unit, and the liquid cooling unit supplies coolant for regulating the temperature of the battery cells 20 to each battery device 100 through pipelines.

[0250] As an example, the main control module may serve as the battery management unit of the battery cluster for monitoring and managing the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For example, it can control the charge and discharge current, voltage, etc. of the battery cluster. The main control module includes modules such as an auxiliary battery management unit SBMU (Slave Battery Management Unit, SBMU), and a fusion switch.

[0251] As an example, the general control module may serve as the battery management unit of the energy storage device 1 for monitoring and managing the energy storage device 1. The general control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device 1. For example, it can control the charge and discharge current, voltage, etc. of the energy storage device 1. As an example, the general control module includes modules such as an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a main battery management unit MBMU (Master Battery Management Unit, MBMU), an Ethernet ETH (EtherNet, ETH), and an optical fiber conversion module.

[0252] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., and is used for detecting, alarming, or extinguishing the energy storage system 2000.

[0253] As an example, the power distribution module can be used to distribute power to the power consumption module of the energy storage device 1.

[0254] According to some embodiments of the present application, please refer to Figure 14 , the present application also provides an energy storage system 2000. The energy storage system 2000 includes a power conversion device and the energy storage device 1 described in any of the above solutions. The battery device 100 is used for storing or providing electrical energy.

[0255] The energy storage system 2000 may include one or more energy storage devices 1 and a power conversion device 2 (Power Converter System, abbreviated as PCS). The power conversion device 2 is used to connect between the power generation device 3 and the energy storage device 1. The power generation device 3 is used to generate electrical energy, and the electrical energy generated by the power generation device 3 can be stored in the energy storage device 1 through the power conversion device 2. As an example, the power generation device 3 may specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. Among them, the specific type of the power generation device 3 is not limited in the present application.

[0256] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery device 100, the energy storage device 1 or the energy storage system 2000 described in any of the above solutions, and the battery device 100 is used to store or provide electrical energy.

[0257] According to some embodiments of the present application, please refer to Figure 15 , the present application further provides a charging network 3000, which includes a charging pile 4 and the energy storage device 1 or the energy storage system 2000 described in any of the above solutions, and the energy storage device 1 is used to provide electrical energy for the charging pile 4.

[0258] The charging network 3000 may include a charging pile 4 and an energy storage device 1. The charging pile 4 is electrically connected to the energy storage device 1, and the energy storage device 1 is used to provide electrical energy for the charging pile 4. The charging pile 4 and the battery device 100 in the energy storage device 1 are electrically connected through a cable, and the battery device 100 can provide the electrical energy stored in itself to the charging pile 4. The charging pile 4 has one or more connectors 5, and the connectors 5 are used to connect with an electrical device (such as a vehicle 1000), so that energy can be replenished to the electrical device. Among them, the definition of the battery device 100 is referred to the foregoing, and will not be elaborated herein.

[0259] The energy storage device 1 may be located inside the charging pile 4 (such as an integrated charging and energy storage device), or outside the charging pile 4.

[0260] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: An energy unit, the energy unit comprising a housing and a pouch-shaped battery cell, the pouch-shaped battery cell being located in the housing; The pouch-shaped battery cell comprises a pouch-shaped shell, an electrode assembly and an electrode lead-out portion; the electrode assembly is encapsulated in the pouch-shaped shell, the electrode lead-out portion is at least partially located in the pouch-shaped shell to connect the electrode assembly, and the pouch-shaped shell is provided with a packaging portion at an end portion in a first direction, and the electrode lead-out portion is at least partially exposed from the packaging portion; A liquid collecting structure is provided corresponding to the end of the pouch-shaped battery cell in the energy unit along the first direction, and the liquid collecting structure is located below the packaging portion.

2. The battery device according to claim 1, characterized in that: The electrode lead-out portion includes a first electrode lead-out portion and a second electrode lead-out portion, and the first electrode lead-out portion and the second electrode lead-out portion are respectively located at two ends of the pouch-shaped battery cell along the first direction; the packaging portion includes a first packaging portion and a second packaging portion, the first packaging portion is arranged corresponding to the first electrode lead-out portion, and the first electrode lead-out portion is at least partially exposed from the first packaging portion; the second packaging portion is arranged corresponding to the second electrode lead-out portion, and the second electrode lead-out portion is at least partially exposed from the second packaging portion; The liquid collection structure includes a first liquid collection structure and a second liquid collection structure. The first liquid collection structure corresponds to the first packaging part along the first direction and is located below the first packaging part. The second liquid collection structure corresponds to the second packaging part along the first direction and is located below the second packaging part.

3. The battery device according to claim 2, characterized in that: The energy unit includes a plurality of pouch-shaped battery cells placed in the shell, the shell has first openings on both sides along the first direction, the battery device also includes two insulating members, the two insulating members are respectively covered with the first openings on both sides, and the first liquid collection structure and the second liquid collection structure are respectively arranged on the two insulating members.

4. The battery device according to claim 3, characterized in that: The battery device includes a box body, the shell also includes a second opening facing the inner bottom wall of the box body, an insulating colloid is arranged between the bag-shaped battery monomer and the inner bottom wall of the box body, the insulating colloid is at least partially penetrated through the second opening to insulate and connect the bag-shaped battery monomer and the inner bottom wall of the box body, the liquid collecting structure includes a liquid collecting groove, and the minimum distance between the bottom wall of the groove of the liquid collecting groove and the inner bottom wall of the box body is less than the maximum distance between the upper surface of the insulating colloid and the inner bottom wall of the box body.

5. The battery device according to claim 1, characterized in that: The electrode lead-out portion includes a first electrode lead-out portion and a second electrode lead-out portion, the first electrode lead-out portion and the second electrode lead-out portion are arranged at intervals at a first end portion of the pouch-shaped battery cell along the first direction, the packaging portion includes a first packaging portion located at the first end portion, and the first electrode lead-out portion and the second electrode lead-out portion are at least partially exposed from the first packaging portion; The liquid collection structure includes a first liquid collection structure, and the first liquid collection structure corresponds to the first packaging portion along the first direction and is located below the first packaging portion.

6. The battery device according to claim 1, characterized in that: The liquid collecting structure comprises a guide groove and a liquid storage portion, wherein the guide groove is located below the packaging portion, the liquid storage portion is located on a side of the guide groove away from the pouch-shaped battery cell, and the guide groove is connected to the liquid storage portion.

7. The battery device according to claim 1, characterized in that: The battery device comprises a detection member, at least a portion of which is located in the liquid collecting structure, and the detection member is used to detect liquid in the liquid collecting structure.

8. The battery device according to claim 1, characterized in that: The plurality of pouch-shaped battery cells are arranged along a second direction, the liquid collecting structure comprises a confluence channel, the confluence channel extends along the second direction to be simultaneously located below the packaging portions of the plurality of pouch-shaped battery cells, and the second direction is perpendicular to the first direction.

9. The battery device according to claim 8, characterized in that: The battery device comprises a detection member, at least a portion of which is located in the confluence channel, and the detection member is used to detect liquid in the confluence channel.

10. The battery device according to claim 9, characterized in that: The bottom wall of the confluence channel is provided with a recessed portion, and the detection element is arranged in the recessed portion.

11. The battery device according to claim 10, characterized in that: Along the second direction, the bottom wall of at least one side of the recess is inclined toward the recess.

12. The battery device according to claim 11, characterized in that: The bottom wall of the concave portion on any side of the second direction has an inclination angle R toward the concave portion, and 0°<R≤10°.

13. The battery device according to claim 12, characterized in that: 5°≤R≤10°。 14. The battery device according to any one of claims 8 to 13, characterized in that: The width of the confluence channel is x, 0.5 cm ≤ x ≤ 3 cm.

15. The battery device according to claim 14, characterized in that: 0.5≤x≤1cm.

16. The battery device according to any one of claims 8 to 13, characterized in that: The depth of the confluence channel is h, 0<h≤1cm.

17. The battery device according to any one of claims 7, 9 to 13, characterized in that: The battery device comprises a battery management system, the battery management system is electrically connected to the detection element, and the detection element is configured to send an alarm signal to the battery management system when liquid leakage is detected.

18. The battery device according to any one of claims 1 to 13, characterized in that: The battery device further comprises a liquid absorbing member, wherein the liquid absorbing member is located in the liquid collecting structure.

19. The battery device according to any one of claims 1 to 13, characterized in that: The pouch-shaped battery cell is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

20. An energy storage device, characterized in that: The invention comprises a plurality of battery devices according to any one of claims 1 to 19, wherein the battery devices are used to store or provide electrical energy.

21. An energy storage system, characterized in that: It comprises a power conversion device and the energy storage device as claimed in claim 20, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

22. An electrical device, characterized in that: It comprises the battery device according to any one of claims 1 to 19, the energy storage device according to claim 20 or the energy storage system according to claim 21, wherein the battery device is used to store or provide electrical energy.

23. A charging network, characterized in that: It comprises a charging pile and the energy storage device according to claim 20 or the energy storage system according to claim 21, wherein the energy storage device is used to provide electrical energy for the charging pile.

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