Battery device, energy storage device, energy storage system, electric device, and charging network

Abstract

Disclosed are a battery device (100), an energy storage device (1), an energy storage system, an electric device, and a charging network. The battery device (100) comprises an energy unit (10) and a sampling assembly (20), wherein the energy unit (10) comprises pouch-shaped battery cells (11) and an electrically conductive housing (12), an accommodating space being formed in the housing (12), and the pouch-shaped battery cells (11) being accommodated in the accommodating space; each pouch-shaped battery cell (11) comprises a first electrode lead-out portion (111) and a second electrode lead-out portion (112) which have opposite polarities, the first electrode lead-out portion (111) of at least one of the pouch-shaped battery cells (11) being electrically connected to the housing (12), and the second electrode lead-out portion (112) thereof being insulated from the housing (12); and the sampling assembly (20) is electrically connected to the second electrode lead-out portions (112) and the housing (12).

Description

Battery devices, energy storage devices, energy storage systems, electrical devices and charging networks Technical Field

[0001] This application relates to the field of batteries, specifically to a battery device, an energy storage device, an energy storage system, an electrical device, and a charging network. Background Technology

[0002] The manufacturing process of CTP (Cell To Pack) battery packs is simplified from cell-module-pack to cell-pack, eliminating the intermediate module stage, thus significantly reducing the overall pack weight and increasing energy density. In related technologies, to ensure the reliability of CTP battery packs, a BIC (Battery Information Controller) is typically used to collect the voltage across the positive and negative terminals of any cell in the pack.

[0003] The terminals of a pouch cell are arranged on both sides. In order to collect the voltage of the cell, low-voltage harnesses need to be added on both sides of the cell for voltage sampling. Then, the two low-voltage harnesses are sampled simultaneously. This method requires a large number of low-voltage harnesses and connectors, resulting in complex harness arrangement and high cost. Summary of the Invention

[0004] In view of the above problems, this application provides a battery device, an energy storage device, an energy storage system, an electrical device, and a charging network, which can alleviate the problem of complex sampling harness arrangement in the battery device.

[0005] In a first aspect, this application provides a battery device, which includes an energy unit and a sampling component;

[0006] The energy unit includes a pouch-shaped battery cell and a conductive housing, wherein an accommodating space is formed within the housing, and the pouch-shaped battery cell is housed within the accommodating space;

[0007] The pouch-shaped battery cell includes a first electrode lead and a second electrode lead with opposite polarities.

[0008] The first electrode lead of at least one pouch-shaped battery cell is electrically connected to the housing, and the second electrode lead is insulated from the housing;

[0009] The sampling component is electrically connected to the second electrode lead-out portion and the housing.

[0010] In the technical solution of this application embodiment, the first electrode lead-out portion is electrically connected to the conductive shell, so that the potential of the conductive shell is the same as that of the first electrode lead-out portion. This allows for voltage sampling of the pouch-shaped battery cell on the side of the second electrode lead-out portion, which facilitates the arrangement of the sampling harness and reduces the number of sampling harnesses.

[0011] In some embodiments, the housing has a connecting portion for electrically connecting the sampling component, wherein the distance between the first electrode lead and the second electrode lead is greater than the distance between the connecting portion and the second electrode lead.

[0012] In the above technical solution, the first electrode lead is electrically connected to the housing, and the connecting part on the housing is electrically connected to the sampling component. The distance between the first electrode lead and the second electrode lead is greater than the distance between the connecting part and the second electrode lead. Thus, the wiring for electrically connecting the sampling component to the connecting part and the second electrode lead is simpler, and the number of sampling wires can also be reduced.

[0013] In some embodiments, the first electrode lead-out portion and the second electrode lead-out portion are respectively located on two end faces of the pouch cell facing each other along a first direction.

[0014] Along the first direction, the distance between the sampling component and the first electrode lead-out is greater than the distance between the sampling component and the second electrode lead-out.

[0015] In the above technical solution, when the sampling component is connected to the second electrode lead-out portion, it facilitates the arrangement of the sampling harness and reduces the number of sampling harnesses. The sampling component only samples from one side of the second electrode lead-out portion of the pouch-shaped battery cell, and compared to sampling from both sides of the battery device, the connection wiring is simpler and requires fewer connection harnesses.

[0016] In some embodiments, the energy unit includes a first electrode connection portion and a second electrode connection portion, the first electrode connection portion and the first electrode lead-out portion are electrically connected, the second electrode connection portion and the second electrode lead-out portion are electrically connected, the first electrode connection portion and the second electrode connection portion are respectively located at both ends of the housing along the first direction, and the sampling component is located on the side of the pouch battery cell along which the second electrode connection portion is provided.

[0017] In the above technical solution, the first electrode connection part is electrically connected to the first electrode lead-out part, and the second electrode connection part is electrically connected to the second electrode lead-out part. In this way, the sampling component can sample the energy unit by being disposed on one side of the second electrode connection part.

[0018] In some embodiments, the housing includes a first opening and two second openings opposite each other along the first direction. The first opening is located on one side of the two second openings along a second direction and communicates with the two first openings. The second direction intersects the first direction.

[0019] The housing further includes a first housing wall, which is opposite to the first opening along the second direction. The energy unit includes a first electrode connection portion and a second electrode connection portion located at both ends of the first housing wall along the first direction. The energy unit includes a first busbar and a second busbar facing each other along the first direction. The first busbar is electrically connected to the first electrode connection portion and the first electrode lead-out portion, and the second busbar is electrically connected to the second electrode connection portion and the second electrode lead-out portion.

[0020] In the above technical solution, the positive and negative electrodes of the pouch battery cell can be led out to the positions of the first electrode connection part and the second electrode connection part on the first housing wall through the first busbar and the second busbar, so that the sampling component can perform sampling on one side of the first housing wall.

[0021] In some embodiments, the first electrode connection portion is connected to the first electrode lead-out portion and the housing respectively, so that the first electrode lead-out portion is indirectly electrically connected to the housing through the first electrode connection portion.

[0022] In the above technical solution, the first electrode lead-out part and the housing are electrically connected through the first electrode connection part, so that the potential of the housing and the first electrode lead-out part are the same.

[0023] In some embodiments, the first busbar connects the first electrode lead-out portion and the housing respectively, so that the first electrode lead-out portion is indirectly electrically connected to the housing through the first busbar.

[0024] In the above technical solution, the electrical connection between the housing and the first electrode lead-out part is realized by the first busbar. During installation, the first electrode lead-out part and the housing are connected by the first busbar respectively, so that the potential of the housing and the first electrode lead-out part are the same.

[0025] In some embodiments, the first electrode lead is directly connected to the housing to be electrically connected to the housing.

[0026] In the above technical solution, the electrical connection between the housing and the first electrode lead-out part is directly realized, the conduction between the first electrode lead-out part and the housing is realized, and the potentials of the housing and the first electrode lead-out part are the same.

[0027] In some embodiments, the sampling component is located on the outside of the first housing wall opposite to the accommodating space, and the sampling component is electrically connected to the second electrode connection portion and the housing, respectively.

[0028] In the above technical solution, the sampling component is located on one side of the second electrode connection part, and the positive and negative electrodes of the pouch battery cell can be sampled by electrically connecting the second electrode connection part and the housing.

[0029] In some embodiments, the battery device includes an electrical connector that connects the first electrode lead and the housing in series.

[0030] In the above technical solution, the electrical connector is disposed between the first electrode lead-out portion of the pouch-shaped battery cell and the housing, and electrically connects the first electrode lead-out portion and the housing, thereby enabling conduction between the first electrode lead-out portion and the housing, making the potentials of the housing and the first electrode lead-out portion the same. Thus, after the sampling component is electrically connected to the connection portion of the housing, the voltage can be monitored on the second electrode lead-out portion side of the pouch-shaped battery cell.

[0031] In some embodiments, the resistance value of the electrical connector is greater than or equal to 1Ω.

[0032] In the above technical solution, the electrical connector has a resistance value, which can prevent the high voltage between the two electrodes from damaging the pouch battery cell in the event of a short circuit between the positive and negative electrodes of the pouch battery cell or a short circuit between the casings of two pouch battery cells. In this way, the electrical connector can protect the battery device.

[0033] In some embodiments, the electrical connector is used to limit the current flowing through the housing to less than or equal to 20A.

[0034] In the above technical solution, the electrical connector is located between the first electrode lead-out portion and the housing, limiting the current flowing through the housing to less than or equal to 20A. This prevents damage to the pouch battery cell caused by the high voltage between the two electrodes in the event of a short circuit between the positive and negative electrodes of the pouch battery cell or a short circuit between the housings of the two pouch battery cells. In this way, the electrical connector can protect the battery device.

[0035] In some embodiments, the electrical connector has a maximum withstand voltage of 100V.

[0036] In the above technical solution, the maximum withstand voltage of the electrical connector refers to the maximum voltage that the electrical connector can withstand during its design and manufacturing process, that is, the highest voltage value that the electrical connector can support. Under specified conditions, the electrical connector can withstand a maximum voltage of 100V without breakdown or damage. This ensures the reliability of the electrical connector.

[0037] In some embodiments, the electrical connector includes at least one of conductive foam and conductive adhesive.

[0038] In the above technical solution, the conductive foam and conductive adhesive have good conductivity, enabling a good electrical connection between the first electrode lead and the shell. Furthermore, the flexibility of the foam material allows the conductive foam to conform to various irregular surfaces, providing tight contact and conductivity. Under pressure, the conductive foam maintains its shape and conductivity, is not easily deformed or damaged, and has good durability. The conductive adhesive not only provides a conductive connection but also has high adhesive strength, firmly bonding the connection between the first electrode lead and the shell.

[0039] In some embodiments, the battery device includes a first busbar, the first busbar and the first electrode lead are electrically connected, and the electrical connector connects the first busbar and the housing to connect the first busbar and the housing in series.

[0040] In the above technical solution, the first busbar is used for electrical connection between the first electrode leads of the pouch-shaped battery cells. The first busbar is electrically connected to the first electrode leads, thereby connecting the pouch-shaped battery cells in the energy unit in series to form a complete battery system. This ensures that current can flow smoothly between the pouch-shaped battery cells, enabling the battery system to output larger current and higher voltage. Electrical connection between the first busbar and the housing is achieved through an electrical connector.

[0041] In some embodiments, the energy unit includes a first electrode connection portion and a second electrode connection portion, the first electrode connection portion and the first electrode lead-out portion being electrically connected, the second electrode connection portion and the second electrode lead-out portion being electrically connected, and the battery device further includes an insulating member, the insulating member insulatingly connecting the second electrode connection portion and the housing.

[0042] In the above technical solution, the insulating component is disposed between the second electrode lead-out portion and the housing. This ensures an insulated connection between the second electrode lead-out portion and the housing, avoids short-circuit connection between the positive and negative electrodes of the pouch cell, and ensures reliable operation of the battery device.

[0043] In some embodiments, the energy unit includes a first electrode connection portion, a second electrode connection portion, a first busbar, and a second busbar. The first busbar is electrically connected to the first electrode connection portion and the first electrode lead-out portion, and the second busbar is electrically connected to the second electrode connection portion and the second electrode lead-out portion.

[0044] The battery device also includes an insulating component that provides an insulating connection between the second busbar and the housing.

[0045] The above technical solution can ensure an insulated connection between the second busbar and the housing, avoid short-circuit connection between the positive and negative terminals of the pouch battery cells, and ensure the reliable operation of the battery device.

[0046] In some embodiments, the insulating element is made of plastic.

[0047] In the above technical solution, the plastic material has good insulation properties, can withstand certain voltage and current, and has good insulation performance, stability and reliability.

[0048] In some embodiments, the resistance of the insulating element is greater than or equal to 1 MΩ.

[0049] In the above technical solution, the second electrode lead-out part and the shell are insulated by setting an insulating component to achieve an insulated connection. The resistance value of the insulating component is greater than or equal to 1MΩ, which makes the insulating component more resistant to current, thereby reducing the occurrence of leakage and ensuring the reliable operation of the battery device.

[0050] In some embodiments, the battery device includes a plurality of energy units, each energy unit including a housing and a plurality of pouch-shaped battery cells arranged side by side within the housing, wherein the first electrode leads of the plurality of pouch-shaped battery cells located in the same housing are all facing the same side and are interconnected, and the second electrode leads of the plurality of pouch-shaped battery cells located in the same housing are all facing the same side and are interconnected.

[0051] In the above technical solution, the battery device includes multiple energy units. The first electrode leads in each energy unit are all facing the same side and connected to each other, and the second electrode leads are all facing the same side and connected to each other. Thus, in an energy unit, the first electrode leads and the second electrode leads are respectively located on both sides of the housing along the first direction, which facilitates the arrangement of the sampling component on one side of the energy unit.

[0052] In some embodiments, an elastic element is provided between adjacent pouch cells located in the same energy unit, and / or,

[0053] Along the direction in which the multiple pouch-shaped battery cells are arranged side by side, an elastic element is provided between the pouch-shaped battery cells and the inner wall of the housing.

[0054] In the above technical solution, after the pouch-shaped battery cell expands, it can compress the elastic element, which can absorb the expansion amount, thereby reducing the outward expansion of the casing to a certain extent and reducing the probability of casing deformation.

[0055] In some embodiments, the battery device includes a plurality of energy units arranged in a group, and the outer surface of the housing is provided with an insulating layer to insulate the housings of two adjacent energy units in the plurality of arranged energy units from each other.

[0056] In the above technical solution, multiple energy units can improve the performance of the battery device, and the insulating layer can ensure the insulation between the casings to a certain extent, thus providing the reliability of the battery device.

[0057] [Corrected according to Rule 91, 16.05.2025] In some embodiments, the energy unit includes a first electrode connection portion and a second electrode connection portion, the first electrode connection portion and the first electrode lead-out portion are electrically connected, the second electrode connection portion and the second electrode lead-out portion are electrically connected, the plurality of energy units are arranged sequentially, the relative positions of the first electrode connection portion and the second electrode connection portion of two adjacent energy units are opposite, and adjacent energy units are connected in series.

[0058] In the above technical solution, it is easy to connect adjacent energy units in series, thereby increasing the power supply voltage of the battery device.

[0059] In some embodiments, the energy unit includes a first electrode connection portion and a second electrode connection portion, wherein the first electrode connection portion and the first electrode lead-out portion are electrically connected, and the second electrode connection portion and the second electrode lead-out portion are electrically connected.

[0060] The battery device includes a plurality of energy units arranged in a group. The battery device also includes a busbar for connecting different energy units. The busbar is connected to at least one first electrode lead-out portion. The busbar is connected to the housing of at least one energy unit so that the first electrode lead-out portion is indirectly electrically connected to the housing through the busbar.

[0061] In the above technical solution, the first electrode lead-out part can be electrically connected to the housing by using a busbar.

[0062] In some embodiments, the plurality of energy units arranged in a group include alternating first energy units and second energy units, wherein the housing of the first energy unit is electrically connected to the busbar, and the housing of the second energy unit is insulated from the busbar.

[0063] In the above technical solution, since the busbar is connected to multiple energy units at the same time, the potential of the busbar can be transferred using only the shell of one of the energy units. This allows the charged and uncharged shells in the multiple energy units arranged in groups to be arranged alternately, which allows the shells with different potentials to be far apart, reducing the risk of short circuits and improving reliability.

[0064] In some embodiments, the housing includes a first opening and two second openings opposite each other along a first direction. The first opening is located on one side of the two second openings along a second direction and communicates with the two first openings. The second direction intersects the first direction.

[0065] The battery device includes a housing, the energy unit is located on the bottom wall of the housing, the housing includes two first end walls forming the first opening, the first end walls are disposed facing the inner bottom wall, and the inner side wall, the outer side wall, and the transition wall connecting the inner side wall and the outer side wall are all provided with an insulating layer.

[0066] The above technical solution can achieve insulation between the shell and the bottom wall of the box.

[0067] In some embodiments, the housing includes a first opening and two second openings opposite each other along a first direction. The first opening is located on one side of the two second openings along a second direction and communicates with the two first openings. The second direction intersects the first direction.

[0068] The battery device includes a housing, the energy unit is located on the bottom wall of the housing, and the housing includes two first end walls forming the first opening. The first end walls and the bottom wall of the housing are insulated and connected by insulating adhesive.

[0069] The above technical solution can achieve insulation between the shell and the bottom wall of the box.

[0070] In some embodiments, the housing includes a first opening and two second openings opposite each other along a first direction. The first opening is located on one side of the two second openings along a second direction and communicates with the two first openings. The second direction intersects the first direction.

[0071] The housing also includes a first housing wall, which is opposite to the first opening along the second direction. The sampling component is located outside the first housing wall, and the first housing wall is also provided with a pressure relief structure.

[0072] In the above technical solution, when the pouch cell undergoes thermal runaway expansion and gas release, the pressure relief structure guides the discharged gas to release pressure in a directional manner, reducing the risk of gas erratic movement affecting the surrounding pouch cells. This also reduces the risk of severe thermal runaway of the energy unit, which is beneficial for the thermal runaway management of the battery device and improves the reliability of the battery device.

[0073] In some embodiments, the sampling component and the pressure relief structure are offset from each other on the first housing wall.

[0074] In the above technical solution, the energy unit protects the sampling component to a certain extent when it releases pressure and exhausts gas.

[0075] In some embodiments, the housing has a connecting portion for electrically connecting the sampling component, the energy unit includes a first electrode connecting portion and a second electrode connecting portion, the first electrode connecting portion and the first electrode lead-out portion are electrically connected, the second electrode connecting portion and the second electrode lead-out portion are electrically connected, the sampling component is disposed between the connecting portion and the second electrode connecting portion, and a pressure relief structure is disposed between the connecting portion and the first electrode connecting portion.

[0076] In the above technical solution, the sampling component can be placed far away from the pressure relief structure, which further reduces or avoids damage to the sampling component when the pressure relief structure vents.

[0077] In some embodiments, the battery device includes a housing, the energy unit is located inside the housing, and the housing is connected to the housing using thermally conductive adhesive.

[0078] In the above technical solution, the box and the shell are fixedly connected by thermally conductive adhesive, which can reliably connect and fix the box and the shell, and facilitate the heat exchange of the battery device.

[0079] In some embodiments, the housing includes a housing body and a heat exchange plate, the heat exchange plate being connected to the housing body and defining an accommodating space together with the housing body, and the energy unit being bonded to the heat exchange plate.

[0080] In the above technical solution, by bonding and fixing the energy unit to the heat exchange plate, the heat exchange plate can perform high-efficiency heat exchange on the pouch battery cell, quickly regulate the temperature of the pouch battery cell, which is beneficial to improve the reliability of the pouch battery cell, and thus improve the reliability of the battery device.

[0081] In some embodiments, the heat exchange plate is disposed at the bottom of the main body of the housing.

[0082] In the above technical solution, since the heat exchange plate is arranged between the pouch battery cell and the bottom wall of the housing, the heat exchange plate can not only efficiently exchange heat with the pouch battery cell, but also play a protective role. When the bottom of the housing is subjected to external mechanical impact, the heat exchange plate can play a buffering role, reducing the damage caused by external mechanical impact to the pouch battery cell, reducing the risk of damage to the pouch battery cell, improving the reliability of the energy unit, and thus improving the reliability of the battery device.

[0083] In some embodiments, 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.

[0084] In the above technical solutions, the use of the aforementioned types of pouch-shaped battery cells provides more options for battery device design to meet different application requirements. Specifically, pouch-shaped battery cells can be lithium iron phosphate cells, which have advantages such as high reliability, long cycle life, light weight, large capacity, and low internal resistance; pouch-shaped battery cells can be ternary lithium battery cells, which have advantages such as high energy density and good electrochemical performance; and pouch-shaped battery cells can be solid-state battery cells, which have advantages such as high energy density, high reliability, light weight, and good high and low temperature performance.

[0085] In some embodiments, the pouch-shaped battery cell is a lithium iron phosphate battery cell, and the ratio of the positive electrode active material, binder, and conductive agent in the positive electrode material of the pouch-shaped battery cell is 96:(1-3):(1-3); the pouch-shaped battery cell is a ternary battery cell, and the ratio of the positive electrode active material, binder, and conductive agent in the positive electrode material of the pouch-shaped battery cell is 96:(2-3):(1-2).

[0086] In the above technical solutions, when the pouch-shaped battery cell is a lithium iron phosphate battery cell, a high proportion of positive electrode active material means that more substances capable of electrochemical reactions can be accommodated within a limited electrode assembly. This is beneficial for increasing the capacity and energy density of the battery device, allowing the lithium iron phosphate battery cell to output higher power while maintaining a relatively small volume and weight, meeting the application scenarios with certain energy density requirements. Using the above-mentioned range for binder and conductive agent dosages can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device. When the pouch-shaped battery cell is a ternary lithium battery cell, due to the relatively complex structure and surface properties of ternary materials, using the above-mentioned proportions of positive electrode active material, binder, and conductive agent helps ensure good adhesion between positive electrode active material particles and between the active material and the current collector. This improves the mechanical stability and integrity of the electrode assembly, reduces the risk of active material detachment and electrode pulverization during charging and discharging, and extends the cycle life of the battery device.

[0087] In some embodiments, the pouch-shaped battery cell is a ternary lithium battery cell, the housing includes a first opening, a plurality of the pouch-shaped battery cells are housed in the housing, the housing also includes a first housing wall, the first housing wall is opposite to the first opening along the second direction, and the first housing wall is provided with a pressure relief structure.

[0088] In the above technical solution, the pressure relief structure can guide the gas discharged during thermal runaway expansion and pressure relief of the ternary battery cell, reduce the risk of gas erratic movement affecting the surrounding ternary battery cells, and thus reduce the risk of severe thermal runaway of the energy unit composed of ternary battery cells. This is beneficial for the thermal runaway management of the energy unit and improves the reliability of the energy unit composed of ternary battery cells.

[0089] In some embodiments, the pressure relief structure is configured as a pressure relief hole; or, the pressure relief structure is configured as a groove; or, the pressure relief structure is configured as a weakening portion.

[0090] The above technical solutions provide more options for the design of pressure relief structures to meet different usage requirements.

[0091] Secondly, this application provides an energy storage device that includes a plurality of battery devices as described in any of the above embodiments, the battery devices being used to store or provide electrical energy.

[0092] Thirdly, this application provides an energy storage system, which includes a power conversion device and the energy storage device described in the above embodiments, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0093] Fourthly, this application provides an electrical device that includes the battery device described in any of the above embodiments, the energy storage device described in the above embodiments, or the energy storage system described in the above embodiments, wherein the battery device, the energy storage device, or the energy storage system is used to provide electrical energy to the electrical device.

[0094] Fifthly, this application provides a charging network, which includes a charging pile and an energy storage device or an energy storage system as described in the above embodiments, wherein the energy storage device or the energy storage system is used to provide electrical energy to the charging pile.

[0095] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0096] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0097] Figure 1 is a schematic diagram of the structure of an energy storage system according to some embodiments of this application;

[0098] Figure 2 is a schematic diagram of the structure of a charging network according to some embodiments of this application;

[0099] Figure 3 is a structural schematic diagram of a vehicle according to some embodiments of this application;

[0100] Figure 4 is an exploded structural diagram of a battery device according to some embodiments of this application;

[0101] Figure 5 is a schematic diagram of the structure of a battery device according to some embodiments of this application;

[0102] Figure 6 is a schematic diagram of the structure of the energy unit in some embodiments of this application;

[0103] Figure 7 is another structural schematic diagram of the energy unit in some embodiments of this application;

[0104] Figure 8 is a schematic diagram of the structure of the housing in some embodiments of this application;

[0105] Figures 9 and 10 are cross-sectional views of energy units in some embodiments of this application.

[0106] Figure 11 is a partially exploded schematic diagram of the energy unit of some embodiments of this application.

[0107] The reference numerals in the detailed embodiments are as follows: vehicle 1000; energy storage device 1, power conversion device 2, power generation equipment 3, charging pile 4, connector 5; energy unit 10, first electrode connection part 101, pouch battery cell 11, first electrode lead-out part 111, second electrode lead-out part 112, housing 12, first housing wall 121, first opening 122, second opening 123, first end wall 124, connection part 13, heat exchange plate 14, thermally conductive adhesive 15, pressure relief structure 16; sampling component 20; electrical connector 30; first busbar 40; insulating component 50; second busbar 60; housing 70, first housing 71, second housing 72; battery device 100, controller 200, motor 300. Detailed Implementation

[0108] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0109] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0110] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0111] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0112] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0113] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0114] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0115] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0116] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0117] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0118] With the rapid development of new energy technologies worldwide, power batteries, as key energy storage devices, are expanding their application scope at an unprecedented speed. They are not only an indispensable energy storage solution in renewable energy power plants such as hydropower, thermal power, wind power, and solar power, but also deeply integrated into the field of electric transportation, becoming the core power source for green travel modes such as electric bicycles, electric motorcycles, and even electric vehicles.

[0119] As a key component of new energy technologies, the application scope of power batteries is expanding daily, and market demand continues to grow. Power batteries play an indispensable role in fields such as renewable energy, electric transportation, military equipment, and aerospace.

[0120] With the development of power battery technology, there are increasingly higher requirements for the energy density of power batteries, and pouch batteries have gradually become an important application type in power batteries. The casing of pouch batteries uses an aluminum-plastic composite film. Due to the lightweight characteristics of the aluminum-plastic film, pouch batteries are lighter in weight for the same capacity, thus having a higher energy density.

[0121] Soft-pack batteries adopt a CTP (Cell To Pack) structure. The manufacturing process of the battery pack is simplified from cell-module-pack to cell-pack, eliminating the intermediate module stage, thereby significantly reducing the overall weight of the pack and increasing energy density. In related technologies, to ensure the reliability of CTP battery packs, a BIC (Battery Information Controller) is usually set up to collect the voltage across the positive and negative terminals of any cell in the battery pack.

[0122] However, since the terminals of the pouch battery are arranged on both sides, in order to collect the cell voltage, low-voltage harnesses need to be added on both sides of the battery for voltage sampling. Then, the two low-voltage harnesses are sampled simultaneously. This method results in two low-voltage harnesses and three connectors in a battery module. This requires more connectors to monitor the voltage, making the harness arrangement complex and costly.

[0123] Based on the above considerations, in order to solve or alleviate the problem of complex sampling harness arrangement in battery devices, this application provides a battery device including an energy unit and a sampling component.

[0124] The energy unit includes a pouch-shaped battery cell and a conductive casing, with an accommodating space formed inside the casing, in which the pouch-shaped battery cell is housed.

[0125] The pouch-shaped battery cell includes a first electrode lead and a second electrode lead with opposite polarities. The first electrode lead is electrically connected to the casing, and the second electrode lead is insulated from the casing.

[0126] The sampling component is electrically connected to the second electrode lead-out and the housing.

[0127] In such a battery device, the first electrode lead is electrically connected to the conductive housing, so that the potential of the conductive housing is the same as that of the first electrode lead. This allows voltage sampling of the pouch-shaped battery cell to be performed on the side of the second electrode lead, which facilitates the arrangement of the sampling harness and reduces the number of sampling harnesses.

[0128] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0129] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0130] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0131] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0132] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0133] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0134] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0135] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0136] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0137] The technical solutions described in this application are applicable to various electrical devices using individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft. This application provides an energy storage device including one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0138] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0139] Please refer to Figure 3, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also 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, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0140] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0141] Please refer to Figure 4, which is an exploded structural diagram of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 70 and an energy unit 10, with the energy unit 10 housed within the housing 70. The housing 70 provides a closed space for the energy unit 10, and the housing 70 can adopt various structures.

[0142] In some embodiments, the housing 70 may include a first housing 71 and a second housing 72, the first housing 71 and the second housing 72 covering each other, the first housing 71 and the second housing 72 together defining an enclosed space for accommodating the energy unit 10.

[0143] The second box 72 can be a hollow structure with one end open, and the first box 71 can be a plate-like structure. The first box 71 covers or fastens to the open side of the second box 72 so that the first box 71 and the second box 72 together define a closed space. The first box 71 and the second box 72 can also be hollow structures with one side open, and the open side of the first box 71 covers or fastens to the open side of the second box 72.

[0144] Of course, the box 70 formed by the first box 71 and the second box 72 can be of various shapes, such as a cylinder, a cuboid, etc.

[0145] In some embodiments, as shown in Figures 5 and 6, this application provides a battery device 100, which includes an energy unit 10 and a sampling component 20.

[0146] The energy unit 10 includes a pouch-shaped battery cell 11 and a conductive housing 12. An accommodating space is formed within the housing 12, and the pouch-shaped battery cell 11 is housed within the accommodating space. The pouch-shaped battery cell 11 includes a first electrode lead-out portion 111 and a second electrode lead-out portion 112 with opposite polarities.

[0147] At least one pouch-shaped battery cell 11 has a first electrode lead 111 electrically connected to the housing 12, and a second electrode lead 112 insulated from the housing 12. The sampling assembly 20 is electrically connected to the second electrode lead 112 and the housing 12.

[0148] In the technical solution of this application embodiment, the first electrode lead-out portion 111 is electrically connected to the conductive housing 12, so that the potential of the conductive housing 12 is the same as that of the first electrode lead-out portion 111. This allows for voltage sampling of the pouch-shaped battery cell 11 on the side of the second electrode lead-out portion 112, which facilitates the arrangement of the sampling harness and reduces the number of sampling harnesses.

[0149] Specifically, the battery device 100 includes an energy unit 10 and a sampling component 20. The energy unit 10 is used to provide voltage and capacity, and the sampling component 20 is used to collect voltage parameters of the energy unit 10 to ensure the reliable operation of the battery device 100.

[0150] The energy unit 10 includes a conductive housing 12 and at least one pouch-shaped battery cell 11, the housing being used to house and secure the at least one pouch-shaped battery cell 11.

[0151] As an example, the electrode assembly of the pouch-shaped battery cell 11 is housed inside an aluminum-plastic film packaging bag, and the edges of the packaging bag can be sealed by heat pressing to form a sealed part, and the electrode lead-out part extends to the outside of the packaging bag to realize the charging and discharging of the battery cell.

[0152] The housing 12 forms a space for accommodating pouch-shaped battery cells 11, which are arranged in a certain order.

[0153] The pouch-shaped battery cell 11 includes a first electrode lead-out portion 111 and a second electrode lead-out portion 112 with opposite polarities. The first electrode lead-out portion 111 is electrically connected to the housing 12, and the second electrode lead-out portion 112 is insulated from the housing 12. Thus, the housing 12 and the first electrode lead-out portion 111 have the same potential.

[0154] The sampling component 20 of the battery device 100 is a key part of the battery management system (BMS). It is responsible for collecting key parameter data such as battery voltage, temperature, and current, and transmitting them to the monitoring center in real time for analysis and processing.

[0155] The sampling component 20 ensures that the battery operates within a reliable voltage range by collecting voltage data from individual battery cells. The sampling component 20 is electrically connected to the housing 12 and the second electrode lead-out portion 112, thus enabling the sampling of the voltage of the energy unit 10.

[0156] The first electrode lead-out portion 111 and the second electrode lead-out portion 112 are used to lead out electrodes from the inside of the pouch-shaped battery cell 11 and extend to the outside of the packaging bag to realize the charging and discharging of the battery cell.

[0157] The first electrode lead-out portion 111 and the second electrode lead-out portion 112 have opposite polarities. For example, the first electrode lead-out portion 111 is the positive electrode of the pouch cell 11, and the second electrode lead-out portion 112 is the negative electrode of the pouch cell 11. Alternatively, the first electrode lead-out portion 111 is the negative electrode of the pouch cell 11, and the second electrode lead-out portion 112 is the positive electrode of the pouch cell 11.

[0158] The first electrode lead-out 111 is electrically connected to the housing 12, so that the first electrode lead-out 111 and the housing 12 have the same potential. The sampling component 20 monitors the voltage between the second electrode lead-out 112 and the housing 12, which can realize the monitoring of the voltage of the pouch cell 11 on the same side, reduce the number of sampling harnesses used, reduce the number of low-voltage connectors, and save space.

[0159] In some embodiments, the housing 12 has a connecting portion (not shown) for electrically connecting the sampling assembly 20, wherein the distance between the first electrode lead-out portion 111 and the second electrode lead-out portion 112 is greater than the distance between the connecting portion and the second electrode lead-out portion 112.

[0160] In the above technical solution, the first electrode lead-out portion 111 is electrically connected to the housing 12, and the connecting portion on the housing 12 is electrically connected to the sampling assembly 20. The distance between the first electrode lead-out portion 111 and the second electrode lead-out portion 112 is greater than the distance between the connecting portion and the second electrode lead-out portion 112. Thus, the wiring connecting the sampling assembly 20 to the connecting portion and the second electrode lead-out portion 112 is simpler, and the number of sampling wires can also be reduced.

[0161] Specifically, the sampling component 20 is connected to the housing 12 via a connecting part. The connecting part can be located close to the second electrode lead-out part 112 or at a position that facilitates the arrangement of the sampling harness, thereby facilitating the connection of the sampling component 20 and the arrangement of the sampling harness. Simultaneously, providing a connecting part on the housing 12 facilitates standardized assembly and improves the speed and accuracy of connecting the sampling component 20 and the housing 12 in the case of mass assembly.

[0162] The distance between the first electrode lead-out portion 111 and the second electrode lead-out portion 112 is greater than the distance between the connecting portion and the second electrode lead-out portion 112. As a result, the sampling assembly 20 requires fewer sampling wires to electrically connect the connecting portion and the second electrode lead-out portion 112, and the connection line is simple. However, if the sampling assembly 20 is electrically connected to the first electrode lead-out portion 111 and the second electrode lead-out portion 112, more sampling wires are required, and the connection line is more complex.

[0163] Therefore, after the first electrode lead-out portion 111 is electrically connected to the housing 12, the sampling assembly 20 can simplify the sampling circuit and reduce the number of sampling wires by connecting the housing 12 and the second electrode lead-out portion 112.

[0164] In some embodiments, the first electrode lead-out portion 111 and the second electrode lead-out portion 112 are respectively located on two opposite end faces of the pouch cell 11 along a first direction.

[0165] Along the first direction, the distance between the sampling component 20 and the first electrode lead-out portion 111 is greater than the distance between the sampling component 20 and the second electrode lead-out portion 112.

[0166] In the above technical solution, the electrodes of the battery device 100 are respectively led out from both ends of the pouch-shaped battery cell 11 along a first direction. Along the first direction, the distance between the sampling component 20 and the first electrode lead-out portion 111 is greater than the distance between the sampling component 20 and the second electrode lead-out portion 112. The first electrode lead-out portion 111 is electrically connected to the housing 12, and the connection portion of the sampling component 20 to the housing 12 and the second electrode lead-out portion 112 are electrically connected, thereby enabling sampling of the pouch-shaped battery cell 11. The sampling component 20 samples only on one side of the second electrode lead-out portion 112 of the pouch-shaped battery cell 11, and compared to sampling on both sides of the battery device 100, the connection circuit is simpler and requires fewer connecting wires.

[0167] Specifically, as shown in Figure 6, the first direction is the left-right direction in the figure. The first electrode lead-out portion 111 and the second electrode lead-out portion 112 of the pouch battery cell 11 are respectively located on two opposite end faces of the pouch battery cell 11 along the first direction, which facilitates the series and parallel connection between multiple pouch battery cells 11.

[0168] As shown in Figure 5, when the first electrode lead-out portion 111 and the second electrode lead-out portion 112 of the pouch battery cell 11 are located on two opposite end faces of the pouch battery cell 11 along the first direction, when the sampling component 20 samples the voltage of the pouch battery cell 11, it is necessary to add low-voltage wire harnesses to the first electrode lead-out portion 111 and the second electrode lead-out portion respectively for voltage sampling, and then simultaneously sample the two low-voltage wire harnesses. This requires more connectors to monitor the voltage, resulting in complex wire harness arrangement and high cost.

[0169] After the first electrode lead-out 111 is connected to the housing 12, the sampling component 20 is located on one side of the second electrode lead-out 112. Along the first direction, the distance between the sampling component 20 and the first electrode lead-out 111 is greater than the distance between the sampling component 20 and the second electrode lead-out 112. The connection part of the housing 12 and the second electrode lead-out 112 are electrically connected. This solution only requires one connector to achieve voltage sampling, and the wiring harness arrangement is simple. The number of wiring harnesses is small.

[0170] In some embodiments, the energy unit 10 includes a first electrode connection portion 101 and a second electrode connection portion. The first electrode connection portion 101 and the first electrode lead-out portion 111 are electrically connected, and the second electrode connection portion and the second electrode lead-out portion 112 are electrically connected. Along a first direction, the first electrode connection portion 101 and the second electrode connection portion are respectively located at both ends of the housing 12, and the sampling component is located on the side of the pouch-shaped battery cell 11 along which the second electrode connection portion is provided.

[0171] In the above technical solution, the first electrode connection part 101 is electrically connected to the first electrode lead-out part 111, and the second electrode connection part is electrically connected to the second electrode lead-out part 112. In this way, the sampling component can sample the energy unit 10 by being provided on one side of the second electrode connection part.

[0172] Specifically, the first electrode connection portion 101 and the second electrode connection portion of the energy unit 10 are located at both ends of the housing 12 along the first direction. When the first electrode connection portion 101 is electrically connected to the first electrode lead-out portion 111 and the second electrode connection portion is electrically connected to the second electrode lead-out portion 112, the sampling component can be located on one side of the second electrode connection portion, that is, the sampling component is set on the side of the housing 12 close to the second electrode connection portion along the first direction for sampling.

[0173] In some embodiments, the housing 12 includes a first opening 122 and two second openings 123 opposite each other along a first direction. The first opening 122 is located on one side of the two second openings 123 along a second direction and communicates with the two first openings 122. The second direction intersects the first direction.

[0174] The housing 12 also includes a first housing wall 121, which is opposite to the first opening 122 along a second direction. The energy unit 10 includes a first electrode connection portion 101 and a second electrode connection portion located at both ends of the first housing wall 121 along a first direction. The energy unit 10 includes a first busbar 40 and a second busbar 60 opposed along the first direction. The first busbar 40 is electrically connected to the first electrode connection portion 101 and the first electrode lead-out portion 111, and the second busbar 60 is electrically connected to the second electrode connection portion and the second electrode lead-out portion 112.

[0175] In the above technical solution, the positive and negative electrodes of the pouch battery cell 11 can be led out to the positions of the first electrode connection portion 101 and the second electrode connection portion on the first housing wall 121 through the first busbar 40 and the second busbar 60, thereby enabling the sampling component to perform sampling on one side of the first housing wall 121.

[0176] Specifically, the housing 12 includes a first opening 122 and two second openings 123 arranged along a first direction, thus forming a "U"-shaped housing 12. The pouch-shaped battery cell 11 is disposed inside the "U"-shaped housing 12, and the first electrode lead-out portion 111 and the second electrode lead-out portion 112 of the pouch-shaped battery cell 11 are respectively located at both ends of the pouch-shaped battery in the first direction.

[0177] The housing 12 includes a first housing wall 121, which is opposite to the first opening 122 in a second direction. The first electrode connection part 101 and the second electrode connection part of the energy unit 10 are disposed on the first housing wall 121. The first electrode connection part 101 and the first electrode lead-out part 111 are electrically connected by the first busbar 40, and the second electrode connection part and the second electrode lead-out part 112 are electrically connected by the second busbar 60. The positive and negative electrodes of the pouch-shaped battery cell 11 located in the first direction can be led out to the first electrode connection part 101 and the second electrode connection part located in the second direction. Thus, the sampling component can perform sampling on one side of the first housing wall 121.

[0178] In some embodiments, the first electrode connection portion 101 is connected to the first electrode lead-out portion 111 and the housing 12 respectively, so that the first electrode lead-out portion 111 is indirectly electrically connected to the housing 12 through the first electrode connection portion 101.

[0179] In the above technical solution, the first electrode lead-out portion 111 and the housing 12 are electrically connected through the first electrode connection portion 101, so that the potential of the housing 12 and the first electrode lead-out portion 111 are the same.

[0180] Specifically, the first electrode connection portion 101 connects the first electrode leads 111 of multiple pouch cells to the housing 12, respectively, to achieve electrical connection between the first electrode leads 111 and the housing 12, making the potential of the housing 12 the same as that of the first electrode leads 111. Thus, the sampling assembly can connect the second electrode connection portion and the housing 12 to achieve voltage sampling of the individual pouch cell 11.

[0181] In some embodiments, the first busbar 40 connects the first electrode lead-out portion 111 and the housing 12 respectively, so that the first electrode lead-out portion 111 is indirectly electrically connected to the housing 12 through the first busbar 40.

[0182] In the above technical solution, the electrical connection between the housing 12 and the first electrode lead-out part 111 is realized by the first busbar 40. During installation, the first electrode lead-out part 111 and the housing 12 are connected by the first busbar 40 respectively, so that the potential of the housing 12 and the first electrode lead-out part 111 are the same.

[0183] Specifically, the housing 12 and the first electrode lead-out portion 111 are electrically connected via the first busbar 40, making the potentials of the housing 12 and the first electrode lead-out portion 111 the same. In this way, the sampling assembly can be connected to the second electrode connection portion and the housing 12 to achieve voltage sampling of the pouch cell 11.

[0184] In some embodiments, the first electrode lead-out portion 111 is directly connected to the housing 12 for electrical connection with the housing 12.

[0185] In the above technical solution, the electrical connection between the housing 12 and the first electrode lead-out portion 111 is directly realized, and the conduction between the first electrode lead-out portion 111 and the housing 12 is realized, so that the potentials of the housing 12 and the first electrode lead-out portion 111 are the same.

[0186] Specifically, the first electrode lead-out portion 111 is directly electrically connected to the housing 12, which is a simple connection method and can save space inside the energy unit 10.

[0187] In some embodiments, the sampling component is located on the outside of the first housing wall 121 opposite to the accommodating space, and the sampling component is electrically connected to the second electrode connection portion and the housing 12 respectively.

[0188] In the above technical solution, the sampling component is located on one side of the second electrode connection part, and the positive and negative electrodes of the pouch battery cell 11 can be sampled by electrically connecting the second electrode connection part and the housing 12.

[0189] Specifically, the sampling component is located on the outside of the first housing wall 121 away from the accommodating space, that is, it does not affect the size of the energy unit 10 in the first direction. At the same time, the first housing wall 121 provides a fixed position for the sampling component. The sampling component is also positioned between the first housing and the first housing wall 121 of the housing, which provides a certain degree of protection for the sampling component.

[0190] In some embodiments, the battery device 100 includes an electrical connector 30 for electrically connecting the first electrode lead-out portion 111 and the housing 12.

[0191] In the above technical solution, the electrical connector 30 is disposed between the first electrode lead-out portion 111 of the pouch battery cell 11 and the housing 12, and electrically connects the first electrode lead-out portion 111 and the housing 12, thereby enabling conduction between the first electrode lead-out portion 111 and the housing 12, making the potential of the housing 12 and the first electrode lead-out portion 111 the same. Thus, after the sampling component 20 is electrically connected to the connection portion of the housing 12, the voltage can be monitored on the second electrode lead-out portion 112 side of the pouch battery cell 11.

[0192] Specifically, as shown in Figure 6, the electrical connector 30 is disposed between the first electrode lead-out portion 111 and the housing 12 to realize the electrical connection between the first electrode lead-out portion 111 and the housing 12.

[0193] Optionally, the electrical connector 30 includes a wire, thus easily achieving an electrical connection between the first electrode lead-out 111 and the housing 12. Simultaneously, since the housing 12 has the same potential as the first electrode lead-out 111, the voltage between the first electrode lead-out 111 and the second electrode lead-out 112, i.e., the voltage of the pouch cell 11, can be accurately obtained.

[0194] Optionally, the electrical connector 30 includes a conductive connecting piece, one end of which is electrically connected to the first electrode lead-out portion 111, and the other end of which is electrically connected to the housing 12, thereby realizing the electrical connection between the first electrode lead-out portion 111 and the housing 12.

[0195] Optionally, the electrical connector 30 includes a conductor connector, meaning that the electrical connector 30 has good conductivity. It can be considered that the current flowing through the electrical connector 30 is basically lossless. The potential of the housing 12 and the first electrode lead-out portion 111 is the same, so the voltage between the first electrode lead-out portion 111 and the second electrode lead-out portion 112, i.e., the voltage of the pouch-shaped battery cell 11, can be accurately obtained.

[0196] Optionally, the electrical connector 30 includes a semiconductor connector, meaning the electrical connector 30 has a certain resistance value. This reduces the current flowing through the sampling line, preventing a short circuit between the first electrode lead 111 and the second electrode lead 112 of the pouch cell 11, which could generate a high-voltage current and damage the pouch cell 11. It is understood that with the electrical connector 30 having a certain resistance value, the actual voltage value of the pouch cell 11 can be obtained based on the acquired sampling voltage, current, and the resistance value of the electrical connector 30.

[0197] In some embodiments, the resistance of the electrical connector 30 is greater than or equal to 1Ω.

[0198] In the above technical solution, the electrical connector 30 has a resistance value, which can prevent the high voltage between the two electrodes from damaging the pouch battery cell 11 in the event of a short circuit between the positive and negative electrodes of the pouch battery cell 11 or a short circuit between the casings 12 of the two pouch battery cells 11. In this way, the electrical connector 30 can protect the battery device 100.

[0199] Specifically, in order to avoid short circuits between the positive and negative terminals of the pouch battery cell 11 or between the housings 12 of the two pouch battery cells 11, an electrical connector 30 with a resistance value is selected to achieve electrical connection between the first electrode lead-out portion 111 and the housing 12.

[0200] If the resistance value of the electrical connector 30 is too small, the short-circuit voltage cannot be effectively reduced.

[0201] If the resistance of the electrical connector 30 is too high, it may affect the sampling accuracy and sampling speed, and may also increase the power loss on the electrical connector 30, thereby causing serious overheating problems in the pouch cell 11. This will not only affect the accuracy of the sampling circuit, but may also cause thermal damage to other parts of the circuit.

[0202] Optionally, the resistance value of the electrical connector 30 is greater than or equal to 1Ω. For example, the resistance value of the electrical connector 30 can be 1Ω, 3Ω, 7Ω, 15Ω, 20Ω, 25Ω, 30Ω, 40Ω, 60Ω or any resistance value greater than or equal to 1Ω.

[0203] It is understood that multiple electrical connectors 30 with resistance values ​​can be connected in series, in parallel, or in a mixed series-parallel connection so that the resistance values ​​of the electrical connectors 30 are within the aforementioned range.

[0204] In some embodiments, the electrical connector 30 is used to limit the current flowing through the housing 12 to less than or equal to 20A.

[0205] In the above technical solution, the electrical connector 30 is disposed between the first electrode lead-out portion 111 and the housing 12, limiting the current flowing through the housing 12 to less than or equal to 20A, so as to avoid damage to the pouch battery cell 11 caused by the high voltage between the two electrodes in the event of a short circuit between the positive and negative electrodes of the pouch battery cell 11 or a short circuit between the housing 12 of the two pouch battery cells 11. In this way, the electrical connector 30 can protect the battery device 100.

[0206] Specifically, by controlling the resistance value of the electrical connector 30 or by setting other current-limiting elements (fuse or circuit breaker) in the sampling circuit, the current flowing through the housing 12 can be less than or equal to 20A, thus protecting the sampling circuit and the pouch battery cell 11.

[0207] For example, the electrical connector 30 is used to limit the current flowing through the housing 12 to 20A, 18A, 16A, 14A, 12A, 10A, 8A, 6A, 4A or 2A, or any other current value less than 20A.

[0208] In practical use, electrical connectors 30 with corresponding resistance values ​​can be selected according to the voltage of the battery device 100 to achieve the protection function of the electrical connectors 30 for the battery device 100.

[0209] In some embodiments, the maximum withstand voltage of the electrical connector 30 is 100V.

[0210] In the above technical solution, the maximum withstand voltage of the electrical connector 30 refers to the maximum voltage that the electrical connector 30 can withstand during its design and manufacturing process, that is, the highest voltage value that the electrical connector 30 can support. Under specified conditions, the electrical connector 30 can withstand a maximum voltage of 100V without breakdown or damage. This ensures the reliability of the electrical connector 30.

[0211] Specifically, the maximum withstand voltage, also known as withstand strength or breakdown voltage, refers to the highest voltage value that the contact pairs of the electrical connector 30 can withstand between the mutually insulated parts or between the insulated parts and the ground within a specified time without causing a breakdown.

[0212] Under specified conditions, the electrical connector 30 can withstand a maximum voltage of 100V without breakdown or damage. This ensures that when the battery device 100 is short-circuited due to impact or coolant leakage, the electrical connector 30 can withstand the voltage of multiple pouch-shaped battery cells 11 connected in parallel, thus guaranteeing the reliability of the electrical connector 30.

[0213] In some embodiments, the electrical connector 30 includes at least one of conductive foam and conductive adhesive.

[0214] In the above technical solution, the conductive foam and conductive adhesive have good conductivity, enabling a good electrical connection between the first electrode lead-out portion 111 and the housing 12. Furthermore, the flexibility of the foam material allows the conductive foam to conform to various irregular surfaces, providing tight contact and conductivity. Under pressure, the conductive foam maintains its shape and conductivity, is not easily deformed or damaged, and has good durability. The conductive adhesive not only provides a conductive connection but also has high adhesive strength, firmly bonding the connection between the first electrode lead-out portion 111 and the housing 12.

[0215] Specifically, conductive foam exhibits excellent conductivity through built-in conductive particles or coatings. The flexibility of the foam material allows it to conform to various irregular surfaces, providing close contact and conductivity. Under pressure, conductive foam maintains its shape and conductivity, resisting deformation or damage.

[0216] The conductive adhesive contains conductive particles, such as metal powder, carbon powder, or graphite. These particles form conductive pathways within the adhesive, giving it excellent conductivity. Furthermore, the conductive adhesive not only provides conductive connections but also possesses high adhesive strength, firmly bonding the connection between the first electrode lead-out portion 111 and the housing 12, thereby reducing assembly steps.

[0217] By connecting the first electrode lead 111 to the housing 12 with conductive adhesive or conductive foam, a good electrical connection can be achieved. However, due to the irregular structure of the pouch battery cell 11, the distance between the first electrode lead 111 and the housing 12 of each pouch battery cell 11 may be different. Using conductive adhesive or conductive foam can allow for a certain error in the distance between the first electrode lead 111 and the housing 12 of different pouch battery cells 11.

[0218] When using conductive adhesive for connection, the amount of conductive adhesive can be selected according to the distance between the first electrode lead-out portion 111 and the housing 12, so that the electrical connector 30 can be adapted to different distances between the first electrode lead-out portion 111 and the housing 12.

[0219] When using conductive foam for connection, because the conductive foam has a certain thickness, the compression of the conductive foam is small when the distance between the first electrode lead-out 111 and the housing 12 is large, and the compression of the conductive foam is large when the distance between the first electrode lead-out 111 and the housing 12 is small. This allows the electrical connector 30 to adapt to different distances between the first electrode lead-out 111 and the housing 12. Furthermore, by setting different amounts of conductive foam, the resistance value of the electrical connector 30 can be controlled.

[0220] In some embodiments, the battery device includes a first busbar 40, the first busbar 40 and a first electrode lead-out portion 111 are electrically connected, and an electrical connector connects the first busbar 40 and the housing 12 to connect the first busbar 40 and the housing 12 in series.

[0221] In the above technical solution, the first busbar 40 is used for electrical connection between the first electrode leads 111 of the pouch battery cells 11. The first busbar 40 is electrically connected to the first electrode leads 111, thereby connecting the pouch battery cells 11 in the energy unit 10 in series to form a complete battery system. This ensures that current can flow smoothly between the pouch battery cells 11, enabling the battery system to output a larger current and a higher voltage. Electrical connection between the first busbar 40 and the housing 12 is achieved through an electrical connector.

[0222] Specifically, the first busbar 40 is used for electrical connection between the first electrode leads 111 of the pouch battery cells 11. For example, in an energy unit 10, there are multiple pouch battery cells 11. The first electrode lead 111 of each pouch battery cell 11 is electrically connected to the first busbar 40. Every two adjacent first busbars 40 are electrically connected, thus realizing electrical connection between multiple pouch battery cells 11.

[0223] The first electrode lead-out portion 111 is electrically connected to the first busbar 40, and then the first busbar component is connected to the housing 12 through the electrical connector 30, so that the housing 12 and the first electrode lead-out portion 111 are electrically connected.

[0224] In one embodiment, the first busbar component includes an electrical connector 30, which is fixedly connected to the first busbar frame 40. When the first busbar frame 40 is electrically connected to the first electrode lead-out portion 111, the electrical connector 30 can also be electrically connected to the housing 12.

[0225] In some embodiments, the energy unit 10 includes a first electrode connection portion 101 and a second electrode connection portion, the first electrode connection portion 101 and the first electrode lead-out portion 111 are electrically connected, the second electrode connection portion and the second electrode lead-out portion 112 are electrically connected, and the battery device further includes an insulating member 50, which insulatingly connects the second electrode connection portion and the housing 12.

[0226] In the above technical solution, the insulating component 50 is disposed between the second electrode connection part and the housing 12. In this way, the second electrode lead-out part 112 and the housing 12 can be insulated and connected, avoiding short circuit connection between the positive and negative electrodes of the pouch battery cell 11 and ensuring the reliable operation of the battery device.

[0227] Specifically, the insulating component 50 is disposed between the second electrode connection portion and the housing 12 to ensure an insulated connection between the second electrode lead-out portion 112 and the housing 12, preventing short circuits and mutual interference between the positive and negative electrodes of the pouch battery cell 11, thereby ensuring the normal operation of the sampling circuit and the reliable operation of the battery device 100.

[0228] In some embodiments, the energy unit 10 includes a first electrode connection portion 101, a second electrode connection portion, a first busbar 40, and a second busbar 60. The first busbar 40 is electrically connected to the first electrode connection portion 101 and the first electrode lead-out portion 111, and the second busbar 60 is electrically connected to the second electrode connection portion and the second electrode lead-out portion 112. The battery device 100 also includes an insulating member 50, which is insulatingly connected to the second busbar 60 and the housing 12.

[0229] In the above technical solution, the second busbar 60 and the housing 12 can be insulated from each other, thereby avoiding short circuit between the positive and negative terminals of the pouch battery cell 11 and ensuring the reliable operation of the battery device.

[0230] Specifically, the insulating component 50 is disposed between the second busbar 60 and the housing 12 to ensure an insulated connection between the second electrode lead-out portion 112 and the housing 12, preventing short circuits and mutual interference between the positive and negative electrodes of the pouch battery cell 11, thereby ensuring the normal operation of the sampling circuit and the reliable operation of the battery device 100.

[0231] In some embodiments, the insulating element 50 is made of plastic.

[0232] In the above technical solution, the plastic material has good insulation properties, can withstand certain voltage and current, and has good insulation performance, stability and reliability.

[0233] Specifically, the plastic material has excellent insulation properties, as well as good heat resistance, corrosion resistance and mechanical strength, making the insulation connection between the second busbar 60 and the housing 12 reliable.

[0234] In some embodiments, the resistance of the insulating element 50 is greater than or equal to 1 MΩ.

[0235] In the above technical solution, the second electrode lead-out part and the housing are insulated from each other by setting an insulating part 50. The resistance value of the insulating part 50 is greater than or equal to 1MΩ, which makes the insulating part 50 more resistant to current, thereby reducing the occurrence of leakage and ensuring the reliable operation of the battery device.

[0236] Specifically, the resistance of the insulating component 50 is greater than or equal to 1MΩ, which can better impede current, reduce leakage, and ensure reliable circuit operation. At the same time, the high resistance of the insulating component 50 can withstand higher electric field strength, reduce material aging caused by the electric field, and help extend the service life of the insulating component 50 and the battery device 100.

[0237] Furthermore, since the high-resistance insulation 50 can withstand higher electric field strength, the battery device 100 can be allowed to operate at higher voltages, thereby improving the power density and efficiency of the battery device 100.

[0238] The resistance of the insulating element 50 is greater than or equal to 1MΩ. For example, the resistance of the insulating element 50 can be 1MΩ, 2MΩ, 3MΩ, 4MΩ, 5MΩ, 6MΩ, 7MΩ, 8MΩ or 9MΩ, or any other value greater than 1MΩ.

[0239] In some embodiments, the battery device includes a plurality of energy units 10, each energy unit 10 including a housing 12 and a plurality of pouch-shaped battery cells 11 arranged side by side within the housing 12. The first electrode leads 111 of the plurality of pouch-shaped battery cells 11 located within the same housing 12 are all facing the same side and are interconnected. Furthermore, the second electrode leads 112 of the plurality of pouch-shaped battery cells 11 located within the same housing 12 are all facing the same side and are interconnected.

[0240] In the above technical solution, the battery device includes multiple energy units 10. The first electrode leads 111 in each energy unit 10 are all facing the same side and connected to each other, and the second electrode leads 112 are all facing the same side and connected to each other. Thus, in one energy unit 10, the first electrode leads 111 and the second electrode leads 112 are respectively located on both sides of the housing 12 along the first direction, which facilitates the arrangement of the sampling component on one side of the energy unit 10.

[0241] Specifically, the battery device 100 includes a plurality of energy units 10, which can be connected in series or in parallel to enable the energy units 10 to have a larger output voltage or output current.

[0242] The first electrode leads 111 in each energy unit 10 are all facing the same side and connected to each other, and the second electrode leads 112 are all facing the same side and connected to each other, which facilitates the parallel connection between multiple pouch-shaped battery cells 11.

[0243] Meanwhile, in an energy unit 10, the first electrode lead-out portion 111 and the second electrode lead-out portion 112 are respectively located on both sides of the housing 12 along the first direction. When the first electrode lead-out portion 111 is electrically connected to the housing 12, it is convenient for the sampling component 20 to be arranged on one side of the energy unit 10 (the right side as shown in FIG5) by being electrically connected to the housing 12 and the second electrode lead-out portion 112.

[0244] When multiple energy units 10 are arranged, the electrode leads of the same polarity of the pouch-shaped battery cells 11 in every two energy units 10 are oriented in opposite directions, which facilitates the connection between multiple energy units 10.

[0245] When multiple energy units 10 are arranged, the first electrode lead-out portion 111 is electrically connected to the housing 12 via the electrical connector 30, and the second electrode lead-out portion 112 is insulated from the housing. The sampling component 20 is disposed on the second electrode lead-out portion 112, and by being electrically connected to the housing 12 and the second electrode lead-out portion 112, voltage sampling of multiple arranged energy units 10 on the same side is realized.

[0246] In some embodiments, an elastic element is provided between adjacent pouch-shaped battery cells 11 located in the same energy unit 10, and / or,

[0247] Along the direction in which multiple pouch-shaped battery cells 11 are arranged side by side, an elastic element is provided between the pouch-shaped battery cells 11 and the inner wall of the casing 12.

[0248] In the above technical solution, after the pouch-shaped battery cell 11 expands, it can compress the elastic element, which can absorb the expansion amount, thereby reducing the outward expansion amount of the casing 12 to a certain extent and reducing the probability of deformation of the casing 12.

[0249] Specifically, during long-term use, the pouch-shaped battery cells 11 may expand. In one embodiment, an elastic element is provided between adjacent pouch-shaped battery cells 11 located in the same energy unit 10, and an elastic element is provided between the pouch-shaped battery cells 11 and the inner wall of the housing 12 along the direction in which multiple pouch-shaped battery cells 11 are arranged side by side. Thus, when one of two adjacent pouch-shaped battery cells 11 expands, and / or when the pouch-shaped battery cell 11 adjacent to the inner wall of the housing 12 expands, the elastic element connected to the expanded pouch-shaped battery cell 11 can absorb at least a portion of the expansion of the pouch-shaped battery cell 11, thereby reducing the amount of expansion acting on the housing 12 to a certain extent, reducing the outward expansion of the housing 12, and reducing the probability of deformation of the housing 12.

[0250] Optionally, in one embodiment, an elastic member is provided between adjacent pouch-shaped battery cells 11 located in the same energy unit 10. Optionally, in one embodiment, an elastic member is provided between the pouch-shaped battery cells 11 and the inner wall of the housing 12 along the direction in which the plurality of pouch-shaped battery cells 11 are arranged side by side.

[0251] Optionally, the elastic element is insulated from the housing 12 and from the pouch-shaped battery cell 11. The elastic element may be made of an insulating material or have an insulating layer coated on its exterior. The elastic element includes, but is not limited to, springs, foam, silicone, etc.

[0252] In some embodiments, the battery device includes a plurality of energy units 10 arranged in a group, and the outer surface of the housing 12 is provided with an insulating layer so that the housings 12 of two adjacent energy units 10 in the plurality of energy units 10 are mutually insulated.

[0253] In the above technical solution, multiple energy units 10 can improve the performance of the battery device, and the insulating layer can ensure the insulation between the casings 12 to a certain extent, thus providing the reliability of the battery device.

[0254] Optionally, multiple energy units 10 can be arranged in a group along a first direction, a second direction, or both directions. The multiple energy units 10 can be connected in series, parallel, or a combination thereof. A combination thereof means that the multiple energy units 10 can be connected in both series and parallel configurations.

[0255] When the energy units 10 are connected in series, they can increase the power supply voltage of the battery device; when the energy units 10 are connected in parallel, they can increase the power supply current of the battery device.

[0256] The insulating layer on the outer surface of the housing 12 can insulate the housings 12 of two adjacent energy units 10 in the arrangement of multiple energy units 10 from each other, thereby avoiding short circuits between the housings 12 of two adjacent energy units 10 to a certain extent, thus improving the reliability of the battery device.

[0257] The insulating layer may be made of materials including but not limited to plastic, foam, silicone, etc. Optionally, the insulating layer may be bonded to the outer surface of the housing 12 with adhesive.

[0258] [Correction 16.05.2025 according to Rule 91] In some embodiments, the energy unit 10 includes a first electrode connection portion 101 and a second electrode connection portion, the first electrode connection portion 101 and the first electrode lead-out portion 111 are electrically connected, the second electrode connection portion and the second electrode lead-out portion 112 are electrically connected, a plurality of energy units 10 are arranged in sequence, the relative positions of the first electrode connection portion 101 and the second electrode connection portion of two adjacent energy units 10 are opposite, and adjacent energy units 10 are connected in series.

[0259] In the above technical solution, adjacent energy units 10 can be connected in series, thereby increasing the power supply voltage of the battery device.

[0260] [Correction based on Rule 91, 16.05.2025] Specifically, the first electrode connection portion 101 and the second electrical connection portion can be the positive electrode connection portion and the negative electrode connection portion of the energy unit 10, respectively. The relative positions of the first electrode connection portions 101 and the second electrode connection portions of two adjacent energy units 10 are opposite, such that the first electrode connection portion 101 of one energy unit 10 can be located on the same side of the battery device as the second electrode connection portion of another energy unit 10, and the second electrode connection portion of one energy unit 10 can be located on the same side of the battery device as the first electrode connection portion 101 of another energy unit 10. This allows for convenient connection of the first electrode connection portion 101 and the second electrode connection portion of two adjacent energy units 10 located on the same side, as well as the second electrode connection portion and the first electrode connection portion 101 located on the other side, thereby realizing the series connection of two adjacent energy units 10.

[0261] Multiple pouch-shaped battery cells 11 in the same energy unit 10 can be connected in series, parallel, or mixed. The first electrode connection portion 101 can be electrically connected to one of the first electrode leads 111, and the second electrode connection portion can be electrically connected to one of the second electrode leads 112.

[0262] In some embodiments, the energy unit 10 includes a first electrode connection portion 101 and a second electrode connection portion, wherein the first electrode connection portion 101 and the first electrode lead-out portion 111 are electrically connected, and the second electrode connection portion and the second electrode lead-out portion 112 are electrically connected.

[0263] The battery device includes a plurality of energy units 10 arranged in a group. The battery device also includes a busbar for connecting different energy units 10. The busbar is connected to at least one first electrode lead-out portion 111 and is connected to the housing 12 of at least one energy unit 10 so that the first electrode lead-out portion 111 is indirectly electrically connected to the housing 12 through the busbar.

[0264] In the above technical solution, the first electrode lead-out part 111 can be electrically connected to the housing 12 by using a busbar.

[0265] Specifically, the busbar can connect different energy units 10, enabling the different energy units 10 to form an electrical connection, such as in series, parallel, or mixed connection. Optionally, the busbar may include a damper.

[0266] The busbar is connected to at least one first electrode lead-out portion 111 and to the housing 12 of at least one energy unit 10, thereby indirectly electrically connecting the first electrode lead-out portion 111 to the housing 12 through the busbar. This allows the sampling assembly to be electrically connected to the first electrode lead-out portion 111 through the housing 12 and the busbar, facilitating the arrangement of the sampling harness and reducing the number of sampling harnesses, as well as reducing additional connectors.

[0267] In some embodiments, a plurality of energy units 10 arranged in a group include alternating first energy units 10 and second energy units 10, the housing 12 of the first energy unit 10 being electrically connected to a busbar, and the housing 12 of the second energy unit 10 being insulated from the busbar.

[0268] In the above technical solution, since the busbar is connected to multiple energy units 10 at the same time, the potential of the busbar can be transmitted using only the shell of one of the energy units 10. This allows the charged shells and uncharged shells of multiple energy units 10 arranged in groups to be arranged alternately, thereby allowing the shells 12 with different potentials to be far apart, reducing the risk of short circuit and improving reliability.

[0269] Specifically, the multiple energy units 10 arranged in groups include alternating first energy units 10 and second energy units 10. The housing 12 of the first energy unit 10 is electrically connected to the busbar, making the housing 12 of the first energy unit 10 energized. The housing 12 of the second energy unit 10 is insulated from the busbar, making the housing 12 of the second energy unit 10 unenergized. This allows the energized and unenergized housings of the multiple energy units 10 arranged in groups to be arranged alternately, increasing the distance between two adjacent energized housings 12.

[0270] A first energy unit 10 is provided between two adjacent second energy units 10, which increases the distance between two adjacent uncharged casings 12, thereby improving the safety of the battery device to a certain extent.

[0271] In some embodiments, referring to Figures 7 and 8, the housing 12 includes a first opening 122 and two second openings 123 opposite each other along a first direction. The first opening 122 is located on one side of the two second openings 123 along a second direction and communicates with the two first openings 122. The second direction intersects the first direction.

[0272] The battery device includes a housing, with the energy unit 10 located on the bottom wall of the housing. The housing 12 includes two first end walls 124 forming a first opening 122. The first end walls 124 are disposed facing the inner bottom wall. The inner side wall, outer side wall, and transition wall connecting the inner side wall and the outer side wall of the first end walls 124 are all provided with an insulating layer.

[0273] In the above technical solution, insulation can be achieved between the shell 12 and the bottom wall of the box.

[0274] Optionally, the first opening 122 can be used to insert the pouch-shaped battery cell 11 into the housing 12, and the two second openings 123 can be used to connect the first electrode lead-out portion 111 and the second electrode lead-out portion 112 of the pouch-shaped battery cell 11 to components outside the housing 12 (such as a busbar, busbar assembly, etc.).

[0275] Optionally, in one embodiment, referring to Figures 4 and 8, the first direction intersects the second direction perpendicularly. The first direction can be the left-right direction shown in the figures, and the second direction is the up-down direction shown in the figures. The first opening 122 is located on one side of the two second openings 123 along the downward direction and connects the two first openings 122. Optionally, in other embodiments, the first direction and the second direction can intersect at an angle.

[0276] The first end wall 124 is positioned facing the inner bottom wall, so that the housing 12 can be connected to the inner bottom wall of the box through the two first end walls 124 that form the first opening 122. The inner side wall, outer side wall, and transition wall connecting the inner side wall and the outer side wall of the first end wall 124 are all provided with an insulating layer, so that the first end wall 124 is insulated from the inner bottom wall of the box, thereby insulating the housing 12 from the inner bottom wall of the box.

[0277] Insulating layers include, but are not limited to, plastics, foam, silicone, etc.

[0278] In some embodiments, the housing 12 includes a first opening 122 and two second openings 123 opposite each other along a first direction. The first opening 122 is located on one side of the two second openings 123 along a second direction and communicates with the two first openings 122. The second direction intersects the first direction.

[0279] The battery device includes a housing, an energy unit 10 located on the bottom wall of the housing, and a housing 12 including two first end walls 124 forming a first opening 122. The first end walls 124 and the bottom wall of the housing are insulated from each other by insulating adhesive.

[0280] In the above technical solution, insulation can be achieved between the shell 12 and the bottom wall of the box.

[0281] Optionally, the first opening 122 can be used to insert the pouch-shaped battery cell 11 into the housing 12, and the two second openings 123 can be used to connect the first electrode lead-out portion 111 and the second electrode lead-out portion 112 of the pouch-shaped battery cell 11 to components outside the housing 12 (such as a busbar, busbar assembly, etc.).

[0282] Optionally, in one embodiment, the first direction intersects the second direction perpendicularly. The first direction can be the left-right direction as shown in the figure, and the second direction is the up-down direction as shown in the figure. The first opening 122 is located on one side of the two second openings 123 along the downward direction and connects the two first openings 122. Optionally, in other embodiments, the first direction and the second direction can intersect at an angle.

[0283] The first end wall 124 and the bottom wall inside the box are insulated together by insulating adhesive, so that the first end wall 124 is insulated from the bottom wall inside the box, thereby insulating the shell 12 from the bottom wall inside the box.

[0284] Alternatively, the insulating adhesive can also fix the energy unit 10 to the bottom wall of the housing by fixing the first end wall 124.

[0285] In some embodiments, the housing 12 includes a first opening 122 and two second openings 123 opposite each other along a first direction. The first opening 122 is located on one side of the two second openings 123 along a second direction and communicates with the two first openings 122. The second direction intersects the first direction.

[0286] The housing 12 also includes a first housing wall 121, which is opposite to the first opening 122 in a second direction. The sampling component is located outside the first housing wall 121, and the first housing wall 121 is also provided with a pressure relief structure 16.

[0287] In the above technical solution, when the pouch cell 11 undergoes thermal runaway expansion and gas release, the pressure relief structure 16 guides the discharged gas to release pressure in a directional manner, reducing the risk of the gas spreading and affecting the surrounding pouch cells 11. This also reduces the risk of severe thermal runaway of the energy unit 10, which is beneficial to the thermal runaway management of the battery device and improves the reliability of the battery device.

[0288] The pressure relief structure 16 can refer to a structure or component that can open to release pressure after the pressure inside the housing 12 reaches a preset value. For example, the pressure relief structure 16 can be an explosion-proof valve.

[0289] Optionally, the pressure relief structure 16 is configured to include, but is not limited to, pressure relief holes, grooves, or weakening sections.

[0290] The pressure relief structure 16 can be configured as a pressure relief hole. When the pressure inside the housing 12 increases due to the gas venting and pressure relief of the bag-shaped battery cell 11, the gas can flow to the pressure relief hole to vent and relieve pressure.

[0291] The scratches can refer to the indentations or grooves or other structures engraved on the first housing wall 121 of the housing 12. When the gas pressure inside the housing 12 is high, the strength of the scratches is weaker than that of other positions on the first housing wall 121, and the probability of rupture is higher. The gas can break through the scratches to release the gas and relieve pressure.

[0292] The weakening section can refer to a weaker structure formed on the first housing wall 121. For example, the weakening section can be a region on the first housing wall 121 where the wall thickness is reduced, or it can be a structure formed by openings in the first housing wall 121 and covering it with a thin film. When the gas pressure inside the housing 12 is high, the weakening section is more likely to rupture, and the gas can break through the location of the weakening section to release pressure.

[0293] The housing 12 is used to accommodate one or more pouch-shaped battery cells 11. When the pouch-shaped battery cell 11 experiences thermal runaway, the internal gas expands to a large volume and causes the outer shell of the pouch-shaped battery cell 11 to rupture, gas will be released to relieve pressure. The released hot gas will cause the pressure relief structure 16 to crack and release gas, guiding the released gas to release pressure in a directional manner.

[0294] Optionally, in one embodiment, the first direction intersects the second direction perpendicularly. The first direction can be the left-right direction as shown in the figure, and the second direction is the up-down direction as shown in the figure. The first opening 122 is located on one side of the two second openings 123 along the downward direction and connects the two first openings 122. The first shell wall 121 is the wall of the upper shell 12. Optionally, in other embodiments, the first direction and the second direction can intersect at an angle.

[0295] Optionally, in one embodiment, the first housing wall 121 may be provided with one or more pressure relief structures 16.

[0296] In some embodiments, the sampling component and the pressure relief structure 16 are offset on the first housing wall 121.

[0297] In the above technical solution, the energy unit 10 protects the sampling component to a certain extent when it is depressurized and venting.

[0298] Specifically, the sampling component and the pressure relief structure 16 are offset on the first housing wall 121, and the sampling component and the pressure relief structure 16 are far apart. The gas discharged from the pressure relief structure 16 will not be sprayed directly onto the sampling component at close range and cause damage to the sampling component, thus protecting the sampling component to a certain extent.

[0299] Optionally, in one embodiment, the pressure relief structure 16 is located at the top of the housing 12, and the sampling component is located on the left or right side of the housing 12.

[0300] [Correction 16.05.2025 according to Rule 91] In some embodiments, the housing 12 has a connecting portion 13 for electrically connecting the sampling assembly. The energy unit 10 includes a first electrode connecting portion 101 and a second electrode connecting portion. The first electrode connecting portion 101 and the first electrode lead-out portion 111 are electrically connected. The second electrode connecting portion and the second electrode lead-out portion 112 are electrically connected. The sampling assembly is disposed between the connecting portion 13 and the second electrode connecting portion. A pressure relief structure 16 is disposed between the connecting portion 13 and the first electrode connecting portion 101.

[0301] In the above technical solution, the sampling component can be positioned away from the pressure relief structure 16, further reducing or avoiding damage to the sampling component when the pressure relief structure 16 vents.

[0302] The connecting part 13 is used for electrical connection of the sampling component, so that the sampling component can be connected to the first electrode connecting part 101 through the connecting part 13 and the housing 12, thereby connecting to the first electrode lead-out part 111, and the sampling component can collect parameter information of the first electrode lead-out part 111. The sampling component can be electrically connected to the second electrode lead-out part 112 through the first electrode connecting part 101 to collect parameter information of the second electrode lead-out part 112.

[0303] Referring to Figures 7 to 11, the second electrode connection and the second electrode lead-out 112 can be located on the left side of the energy unit 10, the first electrode connection 101 and the first electrode lead-out 111 can be located on the right side of the energy unit 10, the sampling component can be located between the connection 13 and the second electrode connection, and the pressure relief structure 16 is located between the connection 13 and the first electrode connection 101, so that the sampling component is set away from the pressure relief structure 16, further reducing or avoiding damage to the sampling component when the pressure relief structure 16 vents.

[0304] In addition, the sampling component can be located between the connection part 13 and the second electrode connection part, which can also reduce the space occupied by the energy unit 10 in the first direction and help to provide the energy unit 10 with a compact structure.

[0305] In some embodiments, a protective member is provided on the outer side of the first housing wall 121, the protective member being used to cover at least one of the first housing walls 121 of the energy unit 10.

[0306] In the above embodiments, the protective component can, to a certain extent, prevent the high-temperature material from falling back to the adjacent charged housing 12 after the pressure relief structure 16 releases gas, thereby preventing a short circuit and improving the reliability of the battery device.

[0307] Specifically, the protective element is used to cover the first housing wall 121 of at least one energy unit 10, so that the pressure relief structure 16 is covered by the protective element. When the pressure relief structure 16 on the covered first housing wall 121 releases gas, the discharged high-temperature material is blocked by the protective element and cannot fall back onto the adjacent charged housing 12, thereby preventing the charged housing 12 from short-circuiting and improving the reliability of the battery device.

[0308] The specification states that, optionally, in one embodiment, the protective component can be made of a high-temperature resistant material, such as mica, to prevent the high-temperature material behind the spray valve from falling back and connecting to the adjacent charged housing 12, causing a short circuit.

[0309] Optionally, in one embodiment, the battery device includes a plurality of protective members, one of which can cover the first housing wall 121 of a corresponding energy unit 10, and the plurality of protective members can be connected along the arrangement direction of the plurality of energy units 10.

[0310] Optionally, in one embodiment, the battery device includes a plurality of protective members, which can be connected along the arrangement direction of the plurality of energy cells 10. The number of protective members is less than the number of energy cells 10, and each protective member can cover the first housing wall 121 of two or more energy cells 10. The plurality of protective members can be connected along the arrangement direction of the plurality of energy cells 10. In one embodiment, one or more of the protective members can cover the first housing wall 121 of two or more energy cells 10, and one or more of the protective members can cover the first housing wall 121 of a corresponding energy cell 10.

[0311] Optionally, in one embodiment, the first housing wall 121 of one or more energy units 10 is covered with a protective element, while the first housing wall 121 of one or more energy units 10 is not covered with a protective element.

[0312] In some embodiments, referring to Figures 4 and 10, the battery device includes a housing, an energy unit 10 located inside the housing, and a casing 12 connected to the housing using thermally conductive adhesive 15.

[0313] In the above technical solution, the box body and the shell 12 are fixedly connected by thermally conductive adhesive 15. On the one hand, the box body and the shell 12 can be reliably connected and fixed, and on the other hand, it is conducive to heat exchange of the battery device.

[0314] In some embodiments, the housing includes a housing body and a heat exchange plate 14. The heat exchange plate 14 is connected to the housing body and together with the housing body defines an accommodating space. The energy unit 10 is attached to the heat exchange plate 14.

[0315] In the above technical solution, by bonding and fixing the energy unit 10 to the heat exchange plate 14, the heat exchange plate 14 can perform high-efficiency heat exchange on the pouch battery cell 11, quickly regulate the temperature of the pouch battery cell 11, which is beneficial to improve the reliability of the pouch battery cell 11, and thus improve the reliability of the battery device.

[0316] In some embodiments, the heat exchange plate 14 is located at the bottom of the housing body.

[0317] In the above technical solution, since the heat exchange plate 14 is arranged between the pouch battery cell 11 and the bottom wall of the box, the heat exchange plate 14 can not only efficiently exchange heat with the pouch battery cell 11, but also play a protective role. When the bottom of the box is subjected to external mechanical impact, the heat exchange plate 14 can play a buffering role, reducing the damage caused by external mechanical impact to the pouch battery cell 11, reducing the risk of damage to the pouch battery cell 11, improving the reliability of the energy unit 10, and thus improving the reliability of the battery device.

[0318] In some embodiments, the pouch-shaped battery cell 11 is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

[0319] Solid-state battery cells can be, but are not limited to, polymer solid-state battery cells, oxide solid-state battery cells, sulfide solid-state battery cells, halide solid-state battery cells, etc. Solid-state battery cells can also be semi-solid-state battery cells or all-solid-state battery cells.

[0320] In the above technical solutions, the use of the aforementioned types of pouch-shaped battery cells 11 provides more options for the design of battery devices to meet different application requirements. Specifically, the pouch-shaped battery cell 11 can be a lithium iron phosphate battery cell, which has advantages such as high reliability, long cycle life, light weight, large capacity, and low internal resistance; it can also be a ternary lithium battery cell, which has advantages such as high energy density and good electrochemical performance; and it can also be a solid-state battery cell, which has advantages such as high energy density, high reliability, light weight, and good high and low temperature performance.

[0321] In some embodiments, the pouch battery cell 11 is a lithium iron phosphate battery cell, and the ratio of the amount of positive electrode active material, binder and conductive agent in the positive electrode material of the pouch battery cell 11 is 96:(1-3):(1-3); the pouch battery cell 11 is a ternary battery cell, and the ratio of the amount of the amount of positive electrode active material, binder and conductive agent in the positive electrode material of the pouch battery cell 11 is 96:(2-3):(1-2).

[0322] In the above technical solutions, when the pouch-shaped battery cell 11 is a lithium iron phosphate battery cell, a high proportion of positive electrode active material means that more substances capable of electrochemical reactions can be accommodated within a limited electrode assembly. This is beneficial for increasing the capacity and energy density of the battery device, enabling the lithium iron phosphate battery cell to output higher power while maintaining a relatively small volume and weight, meeting the application scenarios with certain energy density requirements. Using the above-mentioned range for the amount of binder and conductive agent can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device. When the pouch-shaped battery cell 11 is a ternary battery cell, due to the relatively complex structure and surface properties of ternary materials, using the above-mentioned proportions of positive electrode active material, binder, and conductive agent helps to ensure good adhesion between 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. This helps to reduce the risk of active material shedding and electrode pulverization during charging and discharging, and extends the cycle life of the battery device.

[0323] In some embodiments, the positive electrode of the pouch cell 11 can be a positive electrode sheet, which can include a positive current collector and a positive electrode film layer disposed on at least one surface of the positive current collector, the positive electrode film layer including a positive electrode active material.

[0324] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive electrode film layer is disposed on either or both of the two opposite surfaces of the positive current collector.

[0325] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, titanium, silver-surfaced aluminum, or stainless steel can be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0326] As an example, when the pouch-shaped battery cell 11 in this application embodiment is a lithium-ion battery, the positive electrode active material may include at least one of the following materials: phosphate, layered transition metal oxide, and their respective modified compounds; optionally, the positive electrode active material may include layered transition metal oxide and their respective modified compounds, which is beneficial to improving the energy density of the pouch-shaped battery cell 11. However, this application is not limited to these materials, and other conventional materials that can be used as the positive electrode film layer of a battery may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0327] Examples of phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites.

[0328] Examples of layered transition metal oxides may include, but are not limited to, lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, and lithium nickel cobalt manganese oxides (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 LiNi 0.9 Co 0.05 Mn 0.05 O2 (also known as Ni90), lithium nickel cobalt aluminum oxide (such as LiNi) 0.80 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0329] When the pouch-shaped battery cell 11 in this application embodiment is a sodium-ion battery, the positive electrode active material may include, but is not limited to, at least one of sodium-containing transition metal oxides, polyanionic materials (such as phosphates, fluorophosphates, pyrophosphates, sulfates, etc.), and Prussian blue materials.

[0330] As an example, positive electrode active materials for sodium-ion batteries may include NaFeO2, NaCoO2, NaCrO2, NaMnO2, NaNiO2, and NaNi 1 / 2 Ti 1 / 2 O2, NaNi 1 / 2 Mn 1 / 2O2, Na 2 / 3 Fe 1 / 3 Mn 2 / 3 O2, NaNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2, NaFePO4, NaMnPO4, NaCoPO4, Prussian blue materials, with the general formula X p M' q (PO4) r O x Y 3-x At least one of the materials in general formula X. p M' q (PO4) r O x Y 3-x In the given information, 0 < p ≤ 4, 0 < q ≤ 2, 1 ≤ r ≤ 3, 0 ≤ x ≤ 2, X includes at least one of H+, Li+, Na+, K+ and NH4+, M' is a transition metal cation, optionally at least one of V, Ti, Mn, Fe, Co, Ni, Cu and Zn, and Y is a halide anion, optionally at least one of F, Cl and Br.

[0331] In the embodiments of this application, the modified compounds of the above-mentioned positive electrode active materials can be doped and / or surface coated to modify the positive electrode active materials, such as carbon coating modification, fast ion conductor coating modification, etc.

[0332] During the charging and discharging process, the pouch cell 11 undergoes the insertion and extraction of active ions such as Li, resulting in a different molar content of Li in the pouch cell 11 at different discharge states. In the examples of positive electrode active materials in this application, the molar content of Li refers to the initial state of the material, i.e., the state before feeding. When the positive electrode active material is applied to the battery system, the molar content of Li may change after charge-discharge cycles.

[0333] In the examples of positive electrode active materials in this application, the molar content of oxygen (O) is only a theoretical value. Oxygen release from the crystal lattice will cause the molar content of oxygen (O) to change. In reality, the molar content of oxygen (O) will fluctuate.

[0334] In this embodiment, the elemental content in the positive electrode active material is defined in a way known in the art and can be detected using equipment and methods known in the art. For example, referring to EPA 6010D-2014, it can be measured by inductively coupled plasma atomic emission spectrometry (ICP-OES, instrument model: Thermo ICAP7400). First, 0.4g of the positive electrode active material is weighed and 10ml (50% concentration) of aqua regia is added. Then, it is placed on a plate at 180℃ for 30min. After digestion on the plate, the volume is adjusted to 100mL, and quantitative testing is performed using the standard curve method.

[0335] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, a positive electrode film layer may or may not be provided on the surface of the foamed metal. As an example, lithium source material, potassium metal, or sodium metal may also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0336] In some embodiments, the positive electrode film layer may optionally include a positive electrode conductive agent. This application embodiment does not particularly limit the type of positive electrode conductive agent. As an example, the positive electrode conductive agent includes at least one selected from superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage of the positive electrode conductive agent in the positive electrode film layer is ≤5 wt%.

[0337] In some embodiments, the positive electrode film layer may optionally include a positive electrode binder. This application embodiment does not impose any particular limitation on the type of positive electrode binder. As an example, the positive electrode binder may include at least one selected from polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), PVDF-tetrafluoroethylene-propylene terpolymer, PVDF-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, and fluorinated acrylate resins. In some embodiments, the mass percentage of the positive electrode binder in the positive electrode film layer is ≤5 wt%.

[0338] The positive electrode film is typically formed by coating a positive electrode slurry onto a positive electrode current collector, followed by drying and cold pressing. The positive electrode slurry is usually formed by dispersing the positive electrode active material, optional conductive agent, optional binder, and any other components in a solvent and stirring until homogeneous. The solvent can be N-methylpyrrolidone (NMP), but is not limited to it.

[0339] In some embodiments, the negative electrode may be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, the negative electrode film layer including a negative electrode active material.

[0340] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode film layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0341] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0342] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in pouch cell 11. As an example, the negative electrode active material may include at least one of the following materials: carbon materials (e.g., carbon materials include at least one of artificial graphite, natural graphite, soft carbon, and hard carbon), silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may include at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may include at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode films in batteries may also be used. These negative electrode films may be used alone or in combination of two or more.

[0343] In some embodiments, the negative electrode active material includes silicon, which may exist in the form of a silicon-based material, such as elemental silicon, silicon oxide, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy.

[0344] In some embodiments, the mass content of silicon in the negative electrode film layer is from 1 wt% to 32 wt%, optionally from 2 wt% to 19 wt%, and further optionally from 6 wt% to 13 wt%. In the pouch cell 11 system, when the mass content of silicon is within the above range, the energy density of the pouch cell 11 can be improved.

[0345] In the embodiments of this application, the mass content of silicon in the negative electrode film layer has a meaning known in the art and can be detected using equipment and methods known in the art. For example, the negative electrode sheet can be immersed in a solvent such as water to separate the negative electrode active material from the negative electrode current collector, and the negative electrode active material can be obtained by filtration. The silicon content of the negative electrode active material can be obtained by using an ICAP7400 inductively coupled plasma atomic emission spectrometer from Thermo Fisher Scientific, USA, in accordance with the GB / T30902-2014 standard.

[0346] In some embodiments, the negative electrode film layer may optionally include a negative electrode conductive agent. This application embodiment does not particularly limit the type of negative electrode conductive agent. As an example, the negative electrode conductive agent may include at least one selected from superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage of the negative electrode conductive agent in the negative electrode film layer is ≤5 wt%.

[0347] In some embodiments, the negative electrode film layer may optionally include a negative electrode binder. This application embodiment does not impose any particular limitation on the type of negative electrode binder. As an example, the negative electrode binder may include at least one of styrene-butadiene rubber (SBR), water-soluble unsaturated resin SR-1B, waterborne acrylic resins (e.g., polyacrylic acid PAA, polymethacrylic acid PMAA, sodium polyacrylate PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), and carboxymethyl chitosan (CMCS). In some embodiments, the mass percentage of the negative electrode binder in the negative electrode film layer is ≤5%.

[0348] In some embodiments, the negative electrode film may optionally include other additives. As an example, other additives may include thickeners, such as sodium carboxymethyl cellulose (CMC-Na), PTC thermistor materials, etc. In some embodiments, the mass percentage of other additives in the negative electrode film is ≤2 wt%.

[0349] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0350] In some embodiments, the separator includes a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0351] This application does not impose any particular restrictions on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0352] In some embodiments, the material of the separator may include one or more of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation.

[0353] In some embodiments, the separator may include a porous base membrane and a coating disposed on at least one side of the porous base membrane, the coating including at least one of inorganic particles or organic particles.

[0354] Porous base membranes may include one or more of polyethylene and polypropylene.

[0355] Inorganic particles possess good heat resistance, which can improve the overall heat resistance of the separator. Within the operating voltage range of sodium-ion batteries, inorganic particles essentially do not undergo oxidation and reduction reactions with metal dendrites. In other words, inorganic particles are configured to prevent oxidation and reduction reactions with alkali metals and / or alkaline earth metals at the nominal voltage of sodium-ion batteries.

[0356] In some embodiments, the inorganic particles include one or more of boehmite γ-AlOOH, aluminum oxide Al2O3, aluminum hydroxide Al(OH)3, barium sulfate BaSO4, magnesium oxide MgO, magnesium hydroxide Mg(OH)2, calcium oxide CaO, cerium oxide CeO2, zirconium titanate SrTiO3, barium titanate BaTiO3, and magnesium fluoride MgF2.

[0357] In some embodiments, the organic particles include at least one of polystyrene, polyethylene, polyimide, melamine resin, phenolic resin, polypropylene, polyester (e.g., polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate), polyphenylene sulfide, polyarylamide, polyamide-imide, polyimide, copolymers of butyl acrylate and ethyl methacrylate, and mixtures thereof.

[0358] In some embodiments, the pouch cell 11 further includes an electrolyte.

[0359] During the charging and discharging process of a single battery cell, active ions repeatedly insert and extract between the positive and negative electrode plates, while the electrolyte acts as a conductor for these active ions. This application does not impose any particular restrictions on the type of electrolyte; it can be selected according to actual needs.

[0360] Electrolytes consist of electrolyte salts and solvents. The types of electrolyte salts and solvents are not specifically limited and can be selected according to actual needs.

[0361] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain battery performance, such as additives that improve battery overcharge performance, additives that improve battery high-temperature performance, and additives that improve battery low-temperature power performance.

[0362] For example, the additives include at least one of the following: cyclic carbonate compounds containing unsaturated bonds, sulfate compounds, sulfite compounds, sulfonyl lactone compounds, disulfonic acid compounds, nitrile compounds, aromatic compounds, isocyanate compounds, phosphonitrile compounds, acid anhydrides, cyclic acid anhydride compounds, phosphite compounds, phosphate compounds, borate esters, and carboxylic acid esters.

[0363] It is understandable that when the pouch battery cell 11 is a lithium iron phosphate battery cell, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 1 to 3 parts of the total weight of the positive electrode material (for example, including but not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1 to 3 parts of the total weight of the positive electrode material (for example, including but not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.).

[0364] For example, when the pouch-shaped battery cell 11 is a lithium iron phosphate battery cell, the positive electrode active material is LFP (which can refer to LiFePO4, i.e., lithium iron phosphate), the binder can be PVDF (polyvinylidene fluoride), and the conductive agent can be conductive carbon black. The ratio of LFP:PVDF:conductive carbon black can be 96:2:2, meaning that the total weight of the positive electrode active material is divided into 100 parts, with LFP accounting for 96 parts, PVDF accounting for 2 parts, and conductive carbon black also accounting for 2 parts. The weight unit of the positive electrode active material can be grams.

[0365] When the pouch-shaped battery cell 11 is a ternary lithium battery cell, in the positive electrode material of the pouch-shaped battery cell 11, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 2 to 3 parts of the total weight of the positive electrode material (for example, including but not limited to 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1 to 2 parts of the total weight of the positive electrode material (for example, including but not limited to 1, 1.2, 1.5, 1.8, 2, etc.). The ternary lithium battery cell can be, but is not limited to, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, etc.

[0366] For example, the ternary material of the ternary battery cell can be an octet LiNi. 0.8 Co 0.1 Mn 0.1The weight ratio of O2, positive electrode active material, binder, and conductive agent is 96:2.5:1.5, meaning the total weight of the positive electrode material is divided into 100 parts. (This refers to the octet LiNi...) 0.8 Co 0.1 Mn 0.1 The composition of O2 is 96 parts, the composition of adhesive is 2.5 parts, and the composition of conductive agent is 1.5 parts.

[0367] In the above technical solutions, when the pouch-shaped battery cell 11 is a lithium iron phosphate battery cell, a high proportion of positive electrode active material means that more substances capable of electrochemical reactions can be accommodated within a limited electrode assembly. This is beneficial for increasing the capacity and energy density of the battery device 100, enabling the lithium iron phosphate battery cell to output higher power while maintaining a relatively small volume and weight, meeting the application scenarios with certain energy density requirements. Using the above-mentioned range for the amount of binder and conductive agent can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device 100. When the pouch-shaped battery cell 11 is a ternary battery cell, due to the relatively complex structure and surface properties of ternary materials, using the above-mentioned proportions of positive electrode active material, binder, and conductive agent helps to ensure good adhesion between 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. This helps to reduce the risk of active material detachment and electrode pulverization during charging and discharging, and extends the cycle life of the battery device 100.

[0368] In some embodiments, the pouch-shaped battery cell 11 is a ternary battery cell, the housing 12 includes a first opening 122, a plurality of pouch-shaped battery cells 11 are housed in the housing 12, the housing 12 also includes a first housing wall 121, the first housing wall 121 and the first opening 122 are opposite to each other in a second direction, and the first housing wall 121 is provided with a pressure relief structure 16.

[0369] In the above technical solution, the pressure relief structure 16 can guide the gas discharged during thermal runaway expansion and pressure relief of the ternary battery cell, reduce the risk of gas erratic movement affecting the surrounding ternary battery cells, and reduce the risk of severe thermal runaway of the energy unit composed of ternary battery cells. This is beneficial to the thermal runaway management of the energy unit 10 and improves the reliability of the energy unit 10 composed of ternary battery cells.

[0370] In some embodiments, the pressure relief structure 16 is configured as a pressure relief hole; or, the pressure relief structure is configured as a notch; or, the pressure relief structure is configured as a weakening portion.

[0371] The above technical solutions provide more options for the design of the pressure relief structure 16 to meet different usage requirements.

[0372] In some embodiments, the outer surface of the housing 12 is provided with an insulating layer so that the housings 12 of two adjacent energy units 10 in the plurality of arranged energy units 10 are mutually insulated.

[0373] In the above technical solution, the battery device 100 includes a plurality of arranged energy units 10, each energy unit 10 including a housing 12 and a pouch-shaped battery cell 11 within the housing 12. The housing 12 is electrically connected to the first electrode lead-out portion 111 of the pouch-shaped battery cell 11, meaning that the housing 12 and the first electrode lead-out portion 111 have the same potential. Therefore, the housings 12 of the plurality of energy units 10 cannot directly contact each other. By providing an insulating layer on the outer surface of the housing 12, the housings 12 of two adjacent energy units 10 can be mutually insulated, thus preventing short circuits caused by contact between the housings 12.

[0374] Specifically, since the housing 12 of the energy unit 10 is electrically connected to the first electrode lead-out portion 111 of the pouch-shaped battery cell 11, insulation treatment is required between adjacent housings 12 when multiple energy units are arranged.

[0375] Optionally, an insulating film may be provided on the outer surface of the housing 12. The insulating film is often made of polymer materials such as polyester film (PET). These materials have excellent physical and chemical properties, such as acid and alkali resistance, corrosion resistance, high pressure resistance, no residue, and explosion-proof and flame-retardant properties.

[0376] The insulating film primarily provides electrical insulation, preventing direct contact between the battery casing 12 and external conductive objects, thereby avoiding the risk of short circuits and electric shock. Furthermore, the insulating film effectively prevents moisture and humidity from penetrating the battery, protecting it from corrosion and damage.

[0377] In one embodiment, the insulating film includes a power battery insulating blue film. This type of insulating film is commonly used for the external protection of power batteries. It uses a PET substrate and is coated with oil-based acrylic pressure-sensitive adhesive or silicone pressure-sensitive adhesive. It has good adhesion to steel and aluminum shells and has advantages such as no lifting, good toughness, scratch resistance, and puncture resistance.

[0378] Secondly, this application provides an energy storage device 1, which includes a plurality of battery devices 100 as described in any of the above embodiments, the battery devices 100 being used to store or provide electrical energy.

[0379] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, energy storage devices can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours.

[0380] Thirdly, this application provides an energy storage system, which includes a power conversion device 2 and an energy storage device 1 in the above embodiments, wherein the power conversion device 2 is used to electrically connect the power generation device and the energy storage device 1.

[0381] The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0382] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0383] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0384] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0385] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device via piping to regulate the temperature of the individual battery cells.

[0386] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0387] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an Insulation Monitoring Module (IMM), a Master Battery Management Unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0388] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0389] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0390] In some embodiments, as shown in FIG1, the energy storage system may include one or more energy storage devices 1 and a power conversion system (PCS), wherein the power conversion system 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 system 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. The specific type of the power generation device 3 is not limited in this application.

[0391] Fourthly, this application provides an electrical device that includes the battery device 100 in any of the above embodiments, the energy storage device 1 in the above embodiments, or the energy storage system in the above embodiments. The battery device 100, the energy storage device 1, or the energy storage system is used to provide electrical energy to the electrical device.

[0392] Fifthly, embodiments of this application provide a charging network, which includes a charging pile and an energy storage device or an energy storage system as described in the above embodiments, wherein the energy storage device or energy storage system is used to provide electrical energy to the charging pile.

[0393] As shown in Figure 2, the device includes a charging pile 4 and an energy storage device 1. The charging pile 4 is electrically connected to the energy storage device 1, which provides power to the charging pile 4. The charging pile 4 is electrically connected to the battery device in the energy storage device 1 via a cable, and the battery device can provide its stored electrical energy to the charging pile 4. The charging pile 4 has one or more connectors 5 for connecting to electrical devices (such as vehicles) to replenish their power.

[0394] Energy storage devices can be located inside the charging pile (e.g., an integrated energy storage and charging unit) or outside the charging pile.

[0395] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, Includes energy units and sampling components; The energy unit includes a pouch-shaped battery cell and a conductive housing, wherein an accommodating space is formed within the housing, and the pouch-shaped battery cell is housed within the accommodating space; The pouch-shaped battery cell includes a first electrode lead and a second electrode lead with opposite polarities. At least one of the pouch-shaped battery cells has its first electrode lead-out electrically connected to the housing, and its second electrode lead-out insulated from the housing; The sampling component is electrically connected to the second electrode lead-out portion and the housing.

2. The battery device according to claim 1, characterized in that, The housing has a connecting portion for electrically connecting the sampling component, and the distance between the first electrode lead and the second electrode lead is greater than the distance between the connecting portion and the second electrode lead.

3. The battery device according to claim 2, characterized in that, The first electrode lead-out portion and the second electrode lead-out portion are respectively located on two opposite end faces of the pouch-shaped battery cell along the first direction. Along the first direction, the distance between the sampling component and the first electrode lead-out is greater than the distance between the sampling component and the second electrode lead-out.

4. The battery device according to any one of claims 1-3, characterized in that, The energy unit includes a first electrode connection portion and a second electrode connection portion. The first electrode connection portion and the first electrode lead-out portion are electrically connected, and the second electrode connection portion and the second electrode lead-out portion are electrically connected. Along the first direction, the first electrode connection portion and the second electrode connection portion are respectively located at both ends of the housing. The sampling component is located on the side of the pouch-shaped battery cell along the side where the second electrode connection portion is provided.

5. The battery device according to claim 2, characterized in that, The housing includes a first opening and two second openings opposite each other along a first direction. The first opening is located on one side of the two second openings along a second direction and communicates with the two first openings. The second direction intersects the first direction. The housing further includes a first housing wall, which is opposite to the first opening along the second direction. The energy unit includes a first electrode connection portion and a second electrode connection portion located at both ends of the first housing wall along the first direction. The energy unit includes a first busbar and a second busbar facing each other along the first direction. The first busbar is electrically connected to the first electrode connection portion and the first electrode lead-out portion, and the second busbar is electrically connected to the second electrode connection portion and the second electrode lead-out portion.

6. The battery device according to claim 5, characterized in that, The first electrode connection portion connects the first electrode lead-out portion and the housing respectively, so that the first electrode lead-out portion is indirectly electrically connected to the housing through the first electrode connection portion.

7. The battery device according to claim 5, characterized in that, The first busbar connects the first electrode lead-out portion and the housing respectively, so that the first electrode lead-out portion is indirectly electrically connected to the housing through the first busbar.

8. The battery device according to claim 5, characterized in that, The first electrode lead is directly connected to the housing to be electrically connected to the housing.

9. The battery device according to any one of claims 5-8, characterized in that, The sampling component is located on the outside of the first housing wall, away from the accommodating space, and is electrically connected to the second electrode connection portion and the housing.

10. The battery device according to any one of claims 1-9, characterized in that, The battery device includes an electrical connector that connects the first electrode lead-out portion and the housing in series.

11. The battery device according to claim 10, characterized in that, The resistance value of the electrical connector is greater than or equal to 1Ω.

12. The battery device according to claim 10 or 11, characterized in that, The electrical connector is used to limit the current flowing through the housing to less than or equal to 20A.

13. The battery device according to any one of claims 10-12, characterized in that, The maximum withstand voltage of the electrical connector is 100V.

14. The battery device according to claim 10, characterized in that, The electrical connector includes at least one of conductive foam and conductive adhesive.

15. The battery device according to claim 10, characterized in that, The battery device includes a first busbar, which is electrically connected to the first electrode lead-out portion. The electrical connector connects the first busbar and the housing in series.

16. The battery device according to claim 1, characterized in that, The energy unit includes a first electrode connection portion and a second electrode connection portion, the first electrode connection portion and the first electrode lead-out portion are electrically connected, the second electrode connection portion and the second electrode lead-out portion are electrically connected, and the battery device further includes an insulating component, which insulatingly connects the second electrode connection portion and the housing.

17. The battery device according to claim 1, characterized in that, The energy unit includes a first electrode connection portion, a second electrode connection portion, a first busbar, and a second busbar. The first busbar is electrically connected to the first electrode connection portion and the first electrode lead-out portion, and the second busbar is electrically connected to the second electrode connection portion and the second electrode lead-out portion. The battery device also includes an insulating component that provides an insulating connection between the second busbar and the housing.

18. The battery device according to claim 17, characterized in that, The insulating component is made of plastic.

19. The battery device according to any one of claims 16-18, characterized in that, The resistance of the insulating component is greater than or equal to 1 MΩ.

20. The battery device according to any one of claims 1-19, characterized in that, The battery device includes multiple energy units, each of which includes a housing and multiple pouch-shaped battery cells arranged side by side within the housing. The first electrode leads of the multiple pouch-shaped battery cells located in the same housing all face the same side and are interconnected. Furthermore, the second electrode leads of the multiple pouch-shaped battery cells located in the same housing all face the same side and are interconnected.

21. The battery device according to claim 20, characterized in that, An elastic element is provided between adjacent pouch-shaped battery cells located in the same energy unit. And / or, Along the direction in which the multiple pouch-shaped battery cells are arranged side by side, an elastic element is provided between the pouch-shaped battery cells and the inner wall of the housing.

22. The battery device according to claim 1, characterized in that, The battery device includes multiple energy units arranged in a group, and the outer surface of the housing is provided with an insulating layer so that the housings of two adjacent energy units in the multiple arranged energy units are mutually insulated.

23. [Correction 16.05.2025 according to Rule 91] The battery device according to claim 22, characterized in that, The energy unit includes a first electrode connection portion and a second electrode connection portion. The first electrode connection portion and the first electrode lead-out portion are electrically connected, and the second electrode connection portion and the second electrode lead-out portion are electrically connected. The plurality of energy units are arranged in sequence, and the relative positions of the first electrode connection portion and the second electrode connection portion of two adjacent energy units are opposite. Adjacent energy units are connected in series.

24. The battery device according to claim 1, characterized in that, The energy unit includes a first electrode connection portion and a second electrode connection portion, wherein the first electrode connection portion and the first electrode lead-out portion are electrically connected, and the second electrode connection portion and the second electrode lead-out portion are electrically connected. The battery device includes a plurality of energy units arranged in a group. The battery device also includes a busbar for connecting different energy units. The busbar is connected to at least one first electrode lead-out portion. The busbar is connected to the housing of at least one energy unit so that the first electrode lead-out portion is indirectly electrically connected to the housing through the busbar.

25. The battery device according to claim 24, characterized in that, The energy units arranged in a group include alternating first energy units and second energy units, wherein the housing of the first energy unit is electrically connected to the busbar, and the housing of the second energy unit is insulated from the busbar.

26. The battery device according to claim 1, characterized in that, The housing includes a first opening and two second openings opposite each other along a first direction. The first opening is located on one side of the two second openings along a second direction and communicates with the two first openings. The second direction intersects the first direction. The battery device includes a housing, the energy unit is located on the bottom wall of the housing, the housing includes two first end walls forming the first opening, the first end walls are disposed facing the inner bottom wall, and the inner side wall, the outer side wall, and the transition wall connecting the inner side wall and the outer side wall are all provided with an insulating layer.

27. The battery device according to claim 1, characterized in that, The housing includes a first opening and two second openings opposite each other along a first direction. The first opening is located on one side of the two second openings along a second direction and communicates with the two first openings. The second direction intersects the first direction. The battery device includes a housing, the energy unit is located on the bottom wall of the housing, and the housing includes two first end walls forming the first opening. The first end walls and the bottom wall of the housing are insulated and connected by insulating adhesive.

28. The battery device according to claim 1, characterized in that, The housing includes a first opening and two second openings opposite each other along a first direction. The first opening is located on one side of the two second openings along a second direction and communicates with the two first openings. The second direction intersects the first direction. The housing also includes a first housing wall, which is opposite to the first opening along the second direction. The sampling component is located outside the first housing wall, and the first housing wall is also provided with a pressure relief structure.

29. The battery device according to claim 28, characterized in that, The sampling component and the pressure relief structure are offset from each other on the first housing wall.

30. The battery device according to claim 28 or 29, characterized in that, The housing has a connecting portion for electrically connecting the sampling component. The energy unit includes a first electrode connecting portion and a second electrode connecting portion. The first electrode connecting portion and the first electrode lead-out portion are electrically connected, and the second electrode connecting portion and the second electrode lead-out portion are electrically connected. The sampling component is disposed between the connecting portion and the second electrode connecting portion, and a pressure relief structure is disposed between the connecting portion and the first electrode connecting portion.

31. The battery device according to any one of claims 28-30, characterized in that, A protective member is provided on the outer side of the first housing wall, the protective member being used to cover the first housing wall of at least one of the energy units.

32. The battery device according to any one of claims 1-31, characterized in that, The battery device includes a housing, the energy unit is located inside the housing, and the housing is connected to the housing using thermally conductive adhesive.

33. The battery device according to claim 32, characterized in that, The enclosure includes a main body and a heat exchange plate. The heat exchange plate is connected to the main body and together with the main body defines an accommodating space. The energy unit is attached to the heat exchange plate.

34. The battery device according to claim 33, characterized in that, The heat exchange plate is located at the bottom of the main body of the box.

35. The battery device according to any one of claims 1-34, characterized in that, The pouch-shaped battery cell is any one of lithium iron phosphate battery cell, ternary battery cell, and solid-state battery cell.

36. The battery device according to claim 35, characterized in that, The pouch-shaped battery cell is a lithium iron phosphate battery cell, and the ratio of the positive electrode active material, binder, and conductive agent in the positive electrode material of the pouch-shaped battery cell is 96:(1-3):(1-3); the pouch-shaped battery cell is a ternary battery cell, and the ratio of the positive electrode active material, binder, and conductive agent in the positive electrode material of the pouch-shaped battery cell is 96:(2-3):(1-2).

37. The battery device according to claim 35, characterized in that, The pouch-shaped battery cell is a ternary lithium battery cell. The housing includes a first opening, and multiple pouch-shaped battery cells are housed within the housing. The housing also includes a first housing wall, which is opposite to the first opening in a second direction. The first housing wall is provided with a pressure relief structure.

38. The battery device according to claim 37, characterized in that, The pressure relief structure is configured as a pressure relief hole; or, the pressure relief structure is configured as a groove; or, the pressure relief structure is configured as a weakening section.

39. An energy storage device, characterized in that, Includes a battery device according to any one of claims 1-38, the battery device being used to store or provide electrical energy.

40. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device as described in claim 39, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

41. An electrical appliance, characterized in that, The electrical device includes a battery device according to any one of claims 1-38, or the electrical device includes an energy storage device according to claim 39, or the electrical device includes an energy storage system according to claim 40, wherein the battery device, the energy storage device, or the energy storage system is used to store or provide electrical energy.

42. A charging network, characterized in that, It includes a charging pile and an energy storage device as described in claim 39 or an energy storage system as described in claim 40, wherein the energy storage device or the energy storage system is used to provide electrical energy to the charging pile.

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