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

Abstract

The utility model discloses a battery device, an energy storage device, an energy storage system, a power utilization device and a charging network. The utility model relates to the technical field of batteries, and solves or alleviates the problem of complex arrangement of sampling wire harnesses in a battery device. The battery device comprises an energy unit and a sampling assembly. The energy unit comprises a bag-shaped single battery and a conductive shell, an accommodating space is formed in the shell, and the bag-shaped single battery is accommodated in the accommodating space; each bag-shaped single battery comprises a first electrode leading-out part and a second electrode leading-out part which are opposite in polarity, the first electrode leading-out part of at least one bag-shaped single battery is electrically connected with the shell, and the second electrode leading-out part is insulated from the shell; and the sampling assembly is electrically connected with the second electrode leading-out part and the shell. According to the scheme, the first electrode lead-out part is electrically connected with the conductive shell, and the potential of the conductive shell is the same as that of the first electrode lead-out part, so that voltage sampling can be performed on the bag-shaped single battery on one side of the second electrode lead-out part, and the arrangement of sampling wire harnesses and the reduction of the number of the sampling wire harnesses are facilitated.

Description

Technical Field

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

[0002] The manufacturing process of the CTP (Cell To Pack) battery pack simplifies from battery cells - modules - whole pack to battery cells - whole pack, eliminating the intermediate state of the module, thereby being able to greatly reduce the weight of the whole pack and improve the energy density. In related technologies, in order to ensure the reliable use of the CTP battery pack, a BIC (Battery Information Controller) is usually set to collect the voltages at both ends of the positive and negative electrodes of any battery cell in the battery pack.

[0003] The pole columns of the soft-pack battery cells are arranged on both sides. In order to collect the battery cell voltage, it is necessary to add low-voltage wire harnesses on both sides of the battery cell for voltage sampling, and then synchronously summarize and sample the two low-voltage wire harnesses. This method requires a large number of low-voltage wire harnesses and connectors, resulting in complex wire harness layout and high cost. Summary of the Utility Model

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

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

[0006] The energy unit includes a pouch-type battery cell and a conductive housing, and an accommodation space is formed in the housing, and the pouch-type battery cell is accommodated in the accommodation space;

[0007] The pouch-type battery cell includes a first electrode lead-out portion and a second electrode lead-out portion with opposite polarities,

[0008] The first electrode lead-out portion of at least one pouch-type battery cell is electrically connected to the housing, and the second electrode lead-out portion 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 the embodiment of the present application, the first electrode lead-out portion is electrically connected to the conductive housing, so that the electric potential of the conductive housing is the same as that of the first electrode lead-out portion, thereby enabling voltage sampling of the pouch-type battery cell on the side of the second electrode lead-out portion, facilitating the layout of the sampling wire harness and reducing the number of sampling wire harnesses.

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

[0012] In the above technical solution, the first electrode lead-out portion is electrically connected to the housing, and the connection portion on the housing is electrically connected to the sampling component. The distance between the first electrode lead-out portion and the second electrode lead-out portion is greater than the distance between the connection portion and the second electrode lead-out portion. Thus, the circuit for electrically connecting the sampling component, the connection portion, and the second electrode lead-out portion is simpler, and at the same time, the number of sampling wire harnesses can 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-type battery 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 portion is greater than the distance between the sampling component and the second electrode lead-out portion.

[0015] In the above technical solution, when the sampling component is connected to the second electrode lead-out portion, it is convenient for arranging the sampling wire harness and reducing the number of sampling wire harnesses. The sampling component samples only on one side of the second electrode lead-out portion of the pouch-type battery cell, and compared with sampling on both sides of the battery device, the connection circuit is simpler and fewer connecting wire harnesses are required.

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

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

[0018] In some embodiments, the housing includes a first opening and two second openings facing 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 shell also includes a first shell wall, which is opposite to the first opening along the second direction. The energy unit includes a first electrode connecting portion and a second electrode connecting portion respectively located at both ends of the first shell wall along the first direction. The energy unit includes a first bus rack and a second bus rack opposite to each other along the first direction. The first bus rack electrically connects the first electrode connecting portion and the first electrode lead-out portion, and the second bus rack electrically connects the second electrode connecting portion and the second electrode lead-out portion.

[0020] In the above technical solution, the positive and negative electrodes of the pouch-shaped battery cells can be led out to the first electrode connecting portion and the second electrode connecting portion on the first shell wall through the first busbar and the second busbar, so that the sampling component can perform sampling on one side of the first shell wall.

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

[0022] In the above technical solution, the first electrode lead-out portion and the shell are electrically connected via the first electrode connecting portion, so that the shell and the first electrode lead-out portion have the same potential.

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

[0024] In the above technical solution, the electrical connection between the shell and the first electrode lead-out portion is achieved through the first busbar. During installation, the first electrode lead-out portion and the shell are respectively connected through the first busbar so that the shell and the first electrode lead-out portion have the same potential.

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

[0026] In the above technical solution, the electrical connection between the shell and the first electrode lead-out portion is directly achieved, and conduction between the first electrode lead-out portion and the shell is achieved, so that the potential of the shell and the first electrode lead-out portion are the same.

[0027] In some embodiments, the sampling assembly is located on the outer side of the first shell wall away from the accommodating space, and the sampling assembly is electrically connected to the second electrode connecting portion and the shell respectively.

[0028] In the above technical solution, the sampling component is located at one side of the second electrode connecting portion, and the positive and negative electrodes of the pouch-shaped battery cell can be sampled by electrically connecting the second electrode connecting portion and the shell.

[0029] In some embodiments, the battery device includes an electrical connection member that serially connects the first electrode lead-out portion and the housing.

[0030] In the above technical solution, the electrical connection member is disposed between the first electrode lead-out portion of the pouch-type 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 and making the electric potentials of the housing and the first electrode lead-out portion the same. Thus, after the connection portion of the sampling assembly and the housing is electrically connected, the monitoring voltage can be achieved on the side of the second electrode lead-out portion of the pouch-type battery cell.

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

[0032] In the above technical solution, the electrical connection member has a resistance value, which can prevent damage to the pouch-type battery cell caused by the high voltage between the two electrodes in the case of short circuit between the positive and negative electrodes of the pouch-type battery cell or short circuit between the housings of two pouch-type battery cells. In this way, the electrical connection member can protect the battery device.

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

[0034] In the above technical solution, the electrical connection member is disposed between the first electrode lead-out portion and the housing, and limits the current flowing through the housing to be less than or equal to 20 A, preventing damage to the pouch-type battery cell caused by the high voltage between the two electrodes in the case of short circuit between the positive and negative electrodes of the pouch-type battery cell or short circuit between the housings of two pouch-type battery cells. In this way, the electrical connection member can protect the battery device.

[0035] In some embodiments, the maximum voltage withstand value of the electrical connection member is 100 V (volts).

[0036] In the above technical solution, the maximum voltage withstand value of the electrical connection member refers to the maximum voltage that the electrical connection member can withstand during the design and manufacturing process, that is, the highest voltage value that the electrical connection member can support. Under the specified conditions, the electrical connection member can withstand a maximum voltage of 100 V without breakdown or damage. In this way, the reliability of the electrical connection member can be ensured.

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

[0038] In the above technical solution, the conductive foam and the conductive adhesive have good electrical conductivity, which can achieve good electrical connection between the first electrode lead-out part and the housing. In addition, the softness of the foam material enables the conductive foam to conform to various irregular surfaces, providing close contact and conductive effect. When subjected to pressure, the conductive foam can maintain a certain shape and electrical conductivity, is not easily deformed or damaged, and has good durability. The conductive adhesive can not only provide electrical connection, but also has a very high bonding strength, and can firmly bond the connecting part of the first electrode lead-out part and the housing.

[0039] In some embodiments, the battery device includes a first busbar, the first busbar is electrically connected to the first electrode lead-out part, and the electrical connector connects the first busbar and the housing to serially connect the first busbar and the housing.

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

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

[0042] In the above technical solution, the insulating member is disposed between the second electrode lead-out part and the housing. In this way, the insulating connection between the second electrode lead-out part and the housing can be ensured, avoiding the short-circuit connection between the positive and negative electrodes of the pouch battery cell, and ensuring the reliable operation of the battery device.

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

[0044] The battery device further includes an insulating member, and the insulating member is insulatingly connected to the second busbar and the housing.

[0045] In the above technical solution, the second busbar can be insulated from the housing, avoiding short - circuit connection between the positive and negative electrodes of the pouch - type battery cells, and ensuring the reliable operation of the battery device.

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

[0047] In the above technical solution, the plastic material has good insulation performance, can withstand a certain voltage and current, has good insulation performance, and is stable and reliable.

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

[0049] In the above technical solution, the insulating connection between the second electrode lead - out part and the housing is achieved by arranging an insulating member. The resistance value of the insulating member is greater than or equal to 1 MΩ, so that the insulating member has a stronger ability to block 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 includes a housing and a plurality of the pouch - type battery cells arranged side by side and accommodated in the housing. The first electrode lead - out parts of the plurality of pouch - type battery cells located in the same housing all face the same side and are connected to each other. And the second electrode lead - out parts of the plurality of pouch - type battery cells located in the same housing all face the same side and are connected to each other.

[0051] In the above technical solution, the battery device includes a plurality of energy units. The first electrode lead - out parts in each energy unit all face the same side and are connected to each other, and the second electrode lead - out parts all face the same side and are connected to each other. In this way, in one energy unit, the first electrode lead - out part and the second electrode lead - out part are respectively located on both sides of the housing along the first direction, thus facilitating the arrangement of the sampling component on one side of the energy unit.

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

[0053] An elastic member is provided between the pouch - type battery cells and the inner wall of the housing along the direction in which the plurality of pouch - type battery cells are arranged side by side.

[0054] In the above technical solution, after the pouch - type battery cell expands, it can squeeze the elastic member, and the elastic member can absorb the expansion amount, thereby reducing the expansion amount of the housing outward to a certain extent and reducing the probability of housing deformation.

[0055] In some embodiments, the battery device includes a plurality of energy units, the plurality of energy units are arranged in groups, and an insulating layer is provided on the outer surface of the housing so that the housings of two adjacent energy units among the arranged plurality of energy units are insulated from each other.

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

[0057] In some embodiments, the energy unit includes a first electrode connection part and a second electrode connection part. 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. The plurality of energy units are arranged in sequence, and the relative positions of the electrode lead-out parts with the same polarity of the bag-shaped battery monomers in the first electrode connections of two adjacent energy units and the second electrode connection parts face in opposite directions, and adjacent energy units are connected in series.

[0058] In the above technical solution, it is convenient to connect adjacent energy units in series, so that the power supply voltage of the battery device can be increased.

[0059] In some embodiments, the energy unit includes a first electrode connection part and a second electrode connection part. 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.

[0060] The battery device includes a plurality of energy units arranged in groups. The battery device further includes a bus bar, and the bus bar is used to connect different energy units. The bus bar is connected to at least one of the first electrode lead-out parts, and the bus bar is connected to the housing of at least one energy unit so that the first electrode lead-out part is indirectly electrically connected to the housing through the bus bar.

[0061] In the above technical solution, the bus bar can be used to electrically connect the first electrode lead-out part to the housing.

[0062] In some embodiments, the plurality of energy units arranged in groups include first energy units and second energy units arranged alternately. The housing of the first energy unit is electrically connected to the bus bar, and the housing of the second energy unit is insulated from the bus bar.

[0063] In the above technical solution, since the bus bar is connected to a plurality of energy units at the same time, the potential of the bus bar can be transmitted only by using the housing of one of the energy units, so that the charged housings and the uncharged housings among the plurality of energy units arranged in groups are arranged alternately, so that the housings with different potentials can be at a relatively long distance, reducing the short-circuit risk and improving the reliability.

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

[0065] The battery device includes a box body, the energy unit is located on the inner bottom wall of the box body, the shell includes two first end walls constituting the first opening, the first end walls are arranged toward the inner bottom wall, and the inner wall surface, the outer wall surface, and the transition wall surface connecting the inner wall surface and the outer wall surface of the first end wall are all provided with an insulating layer.

[0066] In the above technical solution, insulation between the shell and the bottom wall of the box body can be achieved.

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

[0068] The battery device comprises a box body, the energy unit is located on the inner bottom wall of the box body, the shell comprises two first end walls constituting the first opening, and the first end walls are insulated and connected to the inner bottom wall of the box body by insulating glue.

[0069] In the above technical solution, insulation between the shell and the bottom wall of the box body can be achieved.

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

[0071] The housing further comprises a first housing wall, the first housing wall is opposite to the first opening along the second direction, the sampling assembly is located outside the first housing wall, and the first housing wall is further provided with a pressure relief structure.

[0072] In the above technical solution, when the pouch-shaped battery cell undergoes thermal runaway expansion and exhaust pressure relief, the pressure relief structure guides the exhausted gas to release pressure in a directional manner, thereby reducing the risk of gas chaos affecting the surrounding pouch-shaped battery cells, and also reducing the risk of severe thermal runaway of the energy unit, which is beneficial to the thermal runaway management of the battery device and improves the reliability of the battery device.

[0073] In some embodiments, the sampling assembly and the pressure relief structure are staggered on the first shell wall.

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

[0075] In some embodiments, the housing has a connecting portion for electrically connecting the sampling component. 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 disposed away from the pressure relief structure, further reducing or avoiding damage to the sampling component when the pressure relief structure exhausts gas.

[0077] In some embodiments, the battery device includes a box body, the energy unit is located inside the box body, and the housing is connected to the box body by a heat-conducting adhesive.

[0078] In the above technical solution, by fixedly connecting the box body and the housing with a heat-conducting adhesive, on the one hand, the box body and the housing can be reliably connected and fixed, and on the other hand, it is beneficial to the heat exchange of the battery device.

[0079] In some embodiments, the box body includes a box body main body and a heat exchange plate. The heat exchange plate is connected to the box body main body and jointly defines a receiving space with the box body main body, and the energy unit is 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-type battery cell, quickly adjust the temperature of the pouch-type battery cell, which is beneficial to improving the reliability of the pouch-type battery cell, and further improving the reliability of the battery device.

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

[0082] In the above technical solution, since the heat exchange plate is disposed between the pouch-type battery cell and the bottom wall of the box body, the heat exchange plate can not only perform efficient heat exchange on the pouch-type battery cell, but also play a protective role. When the bottom of the box body is subjected to external mechanical shock, the heat exchange plate can play a buffering role, reducing the damage caused by the external mechanical shock to the pouch-type battery cell, reducing the risk of damage to the pouch-type battery cell, improving the reliability of the energy unit, and further improving the reliability of the battery device.

[0083] In some embodiments, the pouch-type battery cell is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

[0084] In the above technical solution, the pouch-type battery cells of the above types can provide more choices for the design of the battery device to meet different usage requirements. Among them, the pouch-type battery cell is a lithium iron phosphate battery cell, which has the advantages of high reliability, long cycle life, light weight, large capacity, and small internal resistance; the pouch-type battery cell is a ternary battery cell, which has the advantages of high energy density and good electrochemical performance; the pouch-type battery cell is a solid-state battery cell, which has the advantages of high energy density, high reliability, light weight, and good high and low temperature performance.

[0085] In some embodiments, the pouch-type battery cell is a ternary battery cell, the housing includes a first opening, a plurality of the pouch-type battery cells are received in the housing, the housing further 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.

[0086] In the above technical solution, the pressure relief structure can guide the discharged gas to relieve pressure in a directional manner when the ternary battery cell undergoes thermal runaway expansion and exhausts pressure, reducing the risk of the discharged gas disturbing the surrounding ternary battery cells, and thus reducing the risk of serious thermal runaway of the energy unit composed of ternary battery cells, which is beneficial to the thermal runaway management of the energy unit and improves the reliability of the energy unit composed of ternary battery cells.

[0087] In some embodiments, the pressure relief structure is configured as a pressure relief hole; alternatively, the pressure relief structure is configured as a notch; alternatively, the pressure relief structure is configured as a weakened portion.

[0088] In the above technical solution, more choices can be provided for the design of the pressure relief structure to meet different usage requirements.

[0089] In a second aspect, the present application provides an energy storage device, which includes a plurality of the battery devices in any of the above embodiments, and the battery device is used to store or provide electric energy.

[0090] In a third aspect, the present application provides an energy storage system, which includes a power conversion device and the energy storage device in the above embodiments, and the power conversion device is used to electrically connect a power generation device and the energy storage device.

[0091] In a fourth aspect, the present application provides an electrical device, which includes the battery device in any of the above embodiments, the energy storage device in the above embodiments or the energy storage system in the above embodiments, and the battery device, the energy storage device or the energy storage system is used to provide electric energy for the electrical device.

[0092] Fifth aspect, the present application provides a charging network, which includes a charging pile and the energy storage device or the energy storage system described in the above embodiments, and the energy storage device or the energy storage system is used to provide electric energy for the charging pile.

[0093] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below. Description of the Drawings

[0094] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0095] Figure 1 is a schematic structural diagram of an energy storage system according to some embodiments of the present application;

[0096] Figure 2 is a schematic structural diagram of a charging network according to some embodiments of the present application;

[0097] Figure 3 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0098] Figure 4 is an exploded structural diagram of a battery device according to some embodiments of the present application;

[0099] Figure 5 is a schematic structural diagram of a battery device according to some embodiments of the present application;

[0100] Figure 6 is a schematic structural diagram of an energy unit according to some embodiments of the present application;

[0101] Figure 7 is another schematic structural diagram of an energy unit according to some embodiments of the present application;

[0102] Figure 8 is a schematic structural diagram of a housing according to some embodiments of the present application;

[0103] Figure 9 and Figure 10 is a cross-sectional view of an energy unit according to some embodiments of the present application;

[0104] Figure 11 is a partial exploded view of an energy unit according to some embodiments of the present application.

[0105] The reference numerals in the specific embodiments are as follows:

[0106] Vehicle 1000;

[0107] Energy storage device 1, power conversion device 2, power generation device 3, charging pile 4;

[0108] Energy unit 10, first electrode connection part 101, pouch-type 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, thermal conductive adhesive 15, pressure relief structure 16;

[0109] Sampling component 20; electrical connection part 30; first busbar 40; insulating part 50; second busbar 60;

[0110] Box body 70, first box body 71, second box body 72;

[0111] Battery device 100, controller 200, motor 300. Specific embodiments

[0112] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0113] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0114] If there is no special description, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0115] If there is no special description, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0116] Unless otherwise specified, all steps of this application can be carried out sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) carried out sequentially, or may include steps (b) and (a) carried out sequentially. For example, when it is mentioned that the method may further include step (c), it means that step (c) can be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0117] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0118] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The appearance of this phrase at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0119] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0120] In the description of the embodiments of this application, the term "a plurality of" means more than two (including two). Similarly, "a plurality of groups" means more than two groups (including two groups), and "a plurality of pieces" means more than two pieces (including two pieces).

[0121] In the description of the embodiments of this application, technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of this application.

[0122] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0123] With the rapid development of global new energy technologies, as a key energy storage device, the application scope of power batteries is expanding at an unprecedented speed. It is not only an indispensable energy storage solution in renewable energy power stations 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.

[0124] As a key component of new energy technologies, the application scope of power batteries is increasingly expanding, and the market demand continues to grow. Power batteries play an indispensable role in fields such as renewable energy, electric transportation, military equipment, and aerospace.

[0125] With the development of power battery technologies, there are increasingly high requirements for the energy density of power batteries. Soft-pack batteries have gradually become an important application type in power batteries. The housing of soft-pack batteries uses aluminum-plastic composite films. Due to the lightweight characteristics of the aluminum-plastic films, soft-pack batteries are lighter in weight under the same capacity, and thus have a higher energy density.

[0126] Soft-pack batteries adopt the CTP (CellTo Pack) structure. The manufacturing process of the battery pack is simplified from cell-module-pack to cell-pack, eliminating the intermediate state of the module, thereby being able to significantly reduce the weight of the whole pack and improve the energy density. In related technologies, in order to ensure the reliable use of CTP battery packs, a BIC (Battery Information Controller) is usually set to collect the voltages at both ends of the positive and negative electrodes of any cell in the battery pack.

[0127] However, the pole columns of soft-pack batteries are arranged on both sides. In order to collect the cell voltages, it is necessary to add low-voltage wiring harnesses on both sides of the battery for voltage sampling, and then synchronously summarize and sample the two low-voltage wiring harnesses. Using this method will result in the need for two low-voltage wiring harnesses and three connectors in a battery module. In this way, more connectors are needed to monitor the voltages, resulting in complex wiring harness arrangements and high costs.

[0128] Based on the above considerations, in order to solve or alleviate the problem of complex arrangement of sampling wire harnesses in a battery device, the present application provides a battery device, which includes an energy unit and a sampling component.

[0129] The energy unit includes a pouch-type battery cell and a conductive housing. An accommodation space is formed in the housing, and the pouch-type battery cell is accommodated in the accommodation space.

[0130] The pouch-type battery cell includes a first electrode lead-out portion and a second electrode lead-out portion with opposite polarities. The first electrode lead-out portion is electrically connected to the housing, and the second electrode lead-out portion is insulatedly connected to the housing.

[0131] The sampling component is electrically connected to the second electrode lead-out portion and the housing.

[0132] In such a battery device, by electrically connecting the first electrode lead-out portion to the conductive housing, the electric potential of the conductive housing is made the same as that of the first electrode lead-out portion, so that the voltage of the pouch-type battery cell can be sampled on the side of the second electrode lead-out portion, which is convenient for the arrangement of the sampling wire harness and reduces the number of sampling wire harnesses.

[0133] The battery device (Battery Apparatus) mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery CellAssembly) may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel or in a hybrid connection through a busbar component.

[0134] In some embodiments, the battery cell assembly (Battery CellAssembly) is usually formed by arranging a plurality of battery cells.

[0135] As an example, the battery cell assembly may be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells with cable ties.

[0136] In some embodiments, the battery device may be a battery pack (battery Pack), and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0137] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body by fixing the battery module in the box body.

[0138] As an example, the battery cell assembly may also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0139] As an example, the housing may include a first housing and a second housing. The first housing and the second housing are snap-fitted so that a closed space is formed inside the housing to accommodate the battery cell assembly. Here, "closed" means covering or closing, which can be either sealed or unsealed. The first housing can be a top cover or a bottom plate.

[0140] As an example, the housing may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the housing to accommodate the battery cell assembly.

[0141] In some embodiments, the housing can be part of the chassis structure of a vehicle. For example, part of the housing can become at least part of the floor of the vehicle, or part of the housing can become at least part of the cross beams and longitudinal beams of the vehicle.

[0142] The technical solutions described in the embodiments of this application are applicable to various electrical devices using battery cells, such as mobile phones, portable devices, laptops, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc. Embodiments of this application provide 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 a plurality of battery devices, and the plurality of battery devices are connected in series through a busbar component to increase the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0143] For the convenience of description in the following embodiments, a vehicle 1000 in an embodiment of this application is taken as an example for illustration.

[0144] Please refer to Figure 3 , Figure 3 , which is a schematic structural diagram of the vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0145] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, providing driving power for the vehicle 1000 instead of or partially replacing fuel or natural gas.

[0146] Please refer to Figure 2 , Figure 2 which is a schematic exploded view of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box body 70 and an energy unit 10, and the energy unit 10 is accommodated in the box body 70. Among them, the box body 70 is used to provide a closed space for the energy unit 10, and the box body 70 can adopt various structures.

[0147] In some embodiments, the box body 70 may include a first box body 71 and a second box body 72, the first box body 71 and the second box body 72 cover each other, and the first box body 71 and the second box body 72 jointly define a closed space for accommodating the energy unit 10.

[0148] The second box body 72 may be a hollow structure with one end open, the first box body 71 may be a plate-like structure, and the first box body 71 covers or buckles on the open side of the second box body 72, so that the first box body 71 and the second box body 72 jointly define a closed space; the first box body 71 and the second box body 72 may also both be hollow structures with one side open, and the open side of the first box body 71 covers or buckles on the open side of the second box body 72.

[0149] Of course, the box body 70 formed by the first box body 71 and the second box body 72 can be in various shapes, such as a cylinder, a cuboid, etc.

[0150] In some embodiments, as Figure 5 and Figure 6 shown, the present application provides a battery device 100, and the battery device 100 includes an energy unit 10 and a sampling component 20.

[0151] The energy unit 10 includes a pouch battery cell 11 and a conductive housing 12. An accommodation space is formed in the housing 12, and the pouch battery cell 11 is accommodated in the accommodation space. The pouch battery cell 11 includes a first electrode lead-out portion 111 and a second electrode lead-out portion 112 with opposite polarities.

[0152] The first electrode lead-out portion 111 of at least one pouch battery cell 11 is electrically connected to the housing 12, and the second electrode lead-out portion 112 is insulated from the housing 12. The sampling component 20 is electrically connected to the second electrode lead-out portion 112 and the housing 12.

[0153] In the technical solution of the embodiment of the present application, 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. Thus, voltage sampling of the pouch-type battery cell 11 can be performed on the side of the second electrode lead-out portion 112, which facilitates the arrangement of the sampling wire harness and reduces the number of sampling wire harnesses.

[0154] Specifically, the battery device 100 includes an energy unit 10 and a sampling assembly 20. The energy unit 10 is used to provide voltage and capacity, and the sampling assembly 20 is used to collect the voltage parameters of the energy unit 10 to ensure the reliable operation of the battery device 100.

[0155] The energy unit 10 includes a conductive housing 12 and at least one pouch-type battery cell 11. The housing is used to accommodate and fix at least one pouch-type battery cell 11.

[0156] As an example, the electrode assembly of the pouch-type battery cell 11 is housed in an aluminum-plastic film packaging bag, and the edge of the packaging bag can be connected by thermocompression sealing to form a sealing portion. The electrode lead-out portion extends to the outside of the packaging bag to realize the charge and discharge of the battery cell.

[0157] The housing 12 forms a receiving space for the pouch-type battery cell 11, and the pouch-type battery cells 11 are arranged therein in a certain order.

[0158] The pouch-type 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. In this way, the potential of the housing 12 is the same as that of the first electrode lead-out portion 111.

[0159] The sampling assembly 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 the voltage, temperature, and current of the battery and transmitting it to the monitoring center for analysis and processing in real time.

[0160] The sampling assembly 20 ensures that the battery operates within a reliable voltage range by collecting the voltage data of the battery cell. The sampling assembly 20 is electrically connected to the housing 12 and the second electrode lead-out portion 112, and thus the voltage of the energy unit 10 can be sampled.

[0161] The first electrode lead-out portion 111 and the second electrode lead-out portion 112 are used to lead out the electrodes from the inside of the pouch-type battery cell 11 and extend to the outside of the packaging bag to realize the charge and discharge of the battery cell.

[0162] The polarities of the first electrode lead-out portion 111 and the second electrode lead-out portion 112 are opposite. For example, the first electrode lead-out portion 111 leads out the positive electrode of the pouch-shaped battery cell 11, and the second electrode lead-out portion 112 leads out the negative electrode of the pouch-shaped battery cell 11. Or, the first electrode lead-out portion 111 leads out the negative electrode of the pouch-shaped battery cell 11, and the second electrode lead-out portion 112 leads out the positive electrode of the pouch-shaped battery cell 11.

[0163] The first electrode lead-out portion 111 is electrically connected to the housing 12, so that the first electrode lead-out portion 111 and the housing 12 have the same electric potential. The sampling assembly 20 monitors the voltage between the second electrode lead-out portion 112 and the housing 12, and thus the voltage of the pouch-shaped battery cell 11 can be monitored on the same side, reducing the number of sampling wire harnesses used and the number of low-voltage connectors, and saving space.

[0164] In some embodiments, the housing 12 has a connecting portion (not shown in the figure), and the connecting portion is used for electrically connecting 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.

[0165] 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. In this way, the circuit for the sampling assembly 20 to be electrically connected to the connecting portion and the second electrode lead-out portion 112 is simpler, and at the same time, the number of sampling wire harnesses can also be reduced.

[0166] Specifically, the sampling assembly 20 is connected to the housing 12 through the connecting portion. The connecting portion can be arranged at a position closer to the second electrode lead-out portion 112 or convenient for the arrangement of the sampling wire harness, so as to facilitate the connection of the sampling assembly 20 and the arrangement of the sampling wire harness. At the same time, arranging the connecting portion on the housing 12 is beneficial to standardized assembly and is conducive to quickly and accurately connecting the sampling assembly 20 and the housing 12 in the case of large-scale assembly.

[0167] 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. In this way, the sampling wire harness required for the sampling assembly 20 to be electrically connected to the connecting portion and the second electrode lead-out portion 112 is less, and the connection circuit is simple. If the sampling assembly 20 is connected to electrically connect the first electrode lead-out portion 111 and the second electrode lead-out portion 112, then more sampling wire harnesses are required and the connection circuit is complex.

[0168] Therefore, after the first electrode lead-out portion 111 is electrically connected to the housing 12, the sampling assembly 20 is connected to the housing 12 and the second electrode lead-out portion 112, and the sampling circuit can be simplified and the number of sampling wire harnesses can be reduced.

[0169] In some embodiments, the first electrode lead-out portion 111 and the second electrode lead-out portion 112 are respectively located at two end faces of the pouch-type battery cell 11 that are opposed to each other along the first direction.

[0170] Along the first direction, the distance between the sampling assembly 20 and the first electrode lead-out portion 111 is greater than the distance between the sampling assembly 20 and the second electrode lead-out portion 112.

[0171] In the above technical solution, the electrodes of the battery device 100 are respectively led out from both ends of the pouch-type battery cell 11 along the first direction. Along the first direction, the distance between the sampling assembly 20 and the first electrode lead-out portion 111 is greater than the distance between the sampling assembly 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 assembly 20 and the housing 12 and the second electrode lead-out portion 112 are electrically connected, so that the pouch-type battery cell 11 can be sampled. The sampling assembly 20 samples only on one side of the second electrode lead-out portion 112 of the pouch-type battery cell 11, and compared with sampling on both sides of the battery device 100, the connection line is simpler and fewer connecting wire harnesses are required.

[0172] Specifically, as Figure 6 shown, 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-type battery cell 11 are respectively located at two end faces of the pouch-type battery cell 11 that are opposed to each other along the first direction. In this way, it is convenient for series-parallel connection between multiple pouch-type battery cells 11.

[0173] As Figure 5 shown, in the case where the first electrode lead-out portion 111 and the second electrode lead-out portion 112 of the pouch-type battery cell 11 are respectively located at two end faces of the pouch-type battery cell 11 that are opposed to each other along the first direction, when the sampling assembly 20 samples the voltage of the pouch-type battery cell 11, it is necessary to increase low-voltage wire harnesses at the first electrode lead-out portion 111 and the second electrode lead respectively for voltage sampling, and then synchronously aggregate and sample the two low-voltage wire harnesses. In this way, more connectors are required for voltage monitoring, resulting in complex wire harness layout and high cost.

[0174] After the first electrode lead-out portion 111 is connected to the housing 12, the sampling assembly 20 is on one side of the second electrode lead-out portion 112. Along the first direction, the distance between the sampling assembly 20 and the first electrode lead-out portion 111 is greater than the distance between the sampling assembly 20 and the second electrode lead-out portion 112. The connection portion electrically connected to the housing 12 and the second electrode lead-out portion 112. This solution can realize voltage sampling with only one connector, and the wire harness layout is simple. The number of wire harnesses is small.

[0175] 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 is electrically connected to the first electrode lead portion 111, and the second electrode connection portion is electrically connected to the second electrode lead portion 112. Along the 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 assembly is located on one side of the pouch-type battery cell 11 along the side where the second electrode connection portion is provided.

[0176] In the above technical solution, the first electrode connection portion 101 is electrically connected to the first electrode lead portion 111, and the second electrode connection portion is electrically connected to the second electrode lead portion 112. In this way, the sampling assembly can sample the energy unit 10 by being provided on one side of the second electrode connection portion.

[0177] Specifically, the first electrode connection portion 101 and the second electrode connection portion of the energy unit 10 are respectively 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 portion 111 and the second electrode connection portion is electrically connected to the second electrode lead portion 112, it can be realized that the sampling assembly is located on one side of the second electrode connection portion, that is, the sampling assembly is provided on one side of the housing 12 along the first direction close to the second electrode connection portion for sampling.

[0178] In some embodiments, the housing 12 includes a first opening 122 and two second openings 123 opposed to each other along the first direction. The first opening 122 is located on one side of the two second openings 123 along the second direction and communicates with the two first openings 122. The second direction intersects the first direction.

[0179] The housing 12 further includes a first housing wall 121. The first housing wall 121 is opposite to the first opening 122 along the second direction. The energy unit 10 includes a first electrode connection portion 101 and a second electrode connection portion respectively located at both ends of the first housing wall 121 along the first direction. The energy unit 10 includes a first bus bar 40 and a second bus bar 60 opposed to each other along the first direction. The first bus bar 40 electrically connects the first electrode connection portion 101 and the first electrode lead portion 111, and the second bus bar 60 electrically connects the second electrode connection portion and the second electrode lead portion 112.

[0180] In the above technical solution, through the first bus bar 40 and the second bus bar 60, the positive and negative electrodes of the pouch-type 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, so that the sampling assembly can sample on one side of the first housing wall 121.

[0181] 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-type battery cell 11 is disposed within the "U"-shaped housing 12, and the first electrode lead-out portion 111 and the second electrode lead-out portion 112 of the pouch-type battery cell 11 are respectively located at both ends in the first direction of the pouch-type battery.

[0182] The housing 12 includes a first housing wall 121. The first housing wall 121 is opposite to the first opening 122 along a second direction. The first electrode connection portion 101 and the second electrode connection portion of the energy unit 10 are disposed on the first housing wall 121. By electrically connecting the first electrode connection portion 101 and the first electrode lead-out portion 111 through the first bus bar 40 and electrically connecting the second electrode connection portion and the second electrode lead-out portion 112 through the second bus bar 60, the positive and negative electrodes of the pouch-type battery cell 11 in the first direction can be led out to the first electrode connection portion 101 and the second electrode connection portion in the second direction. Thus, the sampling assembly can perform sampling on one side of the first housing wall 121.

[0183] In some embodiments, the first electrode connection portion 101 is respectively connected to the first electrode lead-out portion 111 and the housing 12, so that the first electrode lead-out portion 111 is indirectly electrically connected to the housing 12 through the first electrode connection portion 101.

[0184] In the above technical solution, by electrically connecting the first electrode lead-out portion 111 and the housing 12 through the first electrode connection portion 101, the potentials of the housing 12 and the first electrode lead-out portion 111 are made the same.

[0185] Specifically, the first electrode connection portion 101 is respectively connected to the first electrode lead-out portions 111 of multiple pouch-type batteries and the housing 12, realizing the electrical connection between the first electrode lead-out portions 111 of the pouch-type batteries and the housing 12, and making the potentials of the housing 12 and the first electrode lead-out portions 111 the same. In this way, the sampling assembly can be connected to the second electrode connection portion and the housing 12 to realize voltage sampling of the pouch-type battery cell 11.

[0186] In some embodiments, the first bus bar 40 is respectively connected to the first electrode lead-out portion 111 and the housing 12, so that the first electrode lead-out portion 111 is indirectly electrically connected to the housing 12 through the first bus bar 40.

[0187] In the above technical solution, the electrical connection between the housing 12 and the first electrode lead-out portion 111 is realized through the first bus bar 40. During installation, the first bus bar 40 is respectively connected to the first electrode lead-out portion 111 and the housing 12, making the potentials of the housing 12 and the first electrode lead-out portion 111 the same.

[0188] Specifically, the housing 12 and the first electrode lead-out portion 111 are electrically connected through the first bus bar 40, so that the housing 12 and the first electrode lead-out portion 111 have the same electric potential. 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 battery cell 11.

[0189] In some embodiments, the first electrode lead-out portion 111 is directly connected to the housing 12 for electrical connection with the housing 12.

[0190] In the above technical solution, the electrical connection between the housing 12 and the first electrode lead-out portion 111 is directly achieved, the conduction between the first electrode lead-out portion 111 and the housing 12 is realized, and the housing 12 and the first electrode lead-out portion 111 have the same electric potential.

[0191] Specifically, the first electrode lead-out portion 111 is directly electrically connected to the housing 12, and the connection method is simple, which can save the space inside the energy unit 10.

[0192] In some embodiments, the sampling assembly is located outside the first housing wall 121 facing away from the accommodation space, and the sampling assembly is electrically connected to the second electrode connection portion and the housing 12 respectively.

[0193] In the above technical solution, the sampling assembly is located on one side of the second electrode connection portion, and the positive and negative electrodes of the pouch battery cell 11 can be sampled by electrically connecting the second electrode connection portion and the housing 12.

[0194] Specifically, the sampling assembly is located outside the first housing wall 121 facing away from the accommodation 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 assembly, and the sampling assembly is arranged between the first box body of the box body and the first housing wall 121, which has a certain protective effect on the sampling assembly.

[0195] In some embodiments, the battery device 100 includes an electrical connector 30, and the electrical connector 30 is used for electrically connecting the first electrode lead-out portion 111 and the housing 12.

[0196] In the above technical solution, the electrical connector 30 is arranged between the first electrode lead-out portion 111 and the housing 12 of the pouch battery cell 11 and electrically connects the first electrode lead-out portion 111 and the housing 12, so that the conduction between the first electrode lead-out portion 111 and the housing 12 can be achieved, and the housing 12 and the first electrode lead-out portion 111 have the same electric potential. Thus, after the connection portion of the sampling assembly 20 and the housing 12 is electrically connected, the voltage can be monitored on one side of the second electrode lead-out portion 112 of the pouch battery cell 11.

[0197] Specifically, as Figure 6As shown, the electrical connector 30 is disposed between the first electrode lead-out portion 111 and the housing 12 to achieve electrical connection between the first electrode lead-out portion 111 and the housing 12.

[0198] Optionally, the electrical connector 30 includes a wire. In this way, the electrical connection between the first electrode lead-out portion 111 and the housing 12 can be simply achieved. At the same time, the housing 12 and the first electrode lead-out portion 111 have the same electric potential, and the voltage between the first electrode lead-out portion 111 and the second electrode lead-out portion 112, that is, the voltage of the pouch-type battery cell 11, can be accurately obtained.

[0199] Optionally, the electrical connector 30 includes a conductive connecting piece. One end of the connecting piece is electrically connected to the first electrode lead-out portion 111, and the other end of the connecting piece is electrically connected to the housing 12, thereby achieving the electrical connection between the first electrode lead-out portion 111 and the housing 12.

[0200] Optionally, the electrical connector 30 includes a conductor connector, that is, the electrical connector 30 has good electrical conductivity, and it can be considered that there is basically no loss when current flows through the electrical connector 30. The housing 12 and the first electrode lead-out portion 111 have the same electric potential, and the voltage between the first electrode lead-out portion 111 and the second electrode lead-out portion 112, that is, the voltage of the pouch-type battery cell 11, can be accurately obtained.

[0201] Optionally, the electrical connector 30 includes a semiconductor connector, that is, the electrical connector 30 has a certain resistance value. In this way, the current flowing through the sampling line can be made smaller, avoiding short-circuiting of the first electrode lead-out portion 111 and the second electrode lead-out portion 112 of the pouch-type battery cell 11 to generate a high-voltage current and further damaging the pouch-type battery cell 11. It can be understood that when the electrical connector 30 has a certain resistance value, the actual voltage value of the pouch-type battery cell 11 can be obtained according to the acquired sampling voltage, current, and the resistance value of the electrical connector 30.

[0202] In some embodiments, the resistance value of the electrical connector 30 is greater than or equal to 1 Ω.

[0203] In the above technical solution, the electrical connector 30 has a resistance value, which can avoid damage to the pouch-type battery cell 11 caused by high voltage between two electrodes in the case of short-circuiting of the positive and negative electrodes of the pouch-type battery cell 11 or short-circuiting of the housings 12 of two pouch-type battery cells 11. In this way, the electrical connector 30 can play a protective role for the battery device 100.

[0204] Specifically, in order to avoid short-circuiting of the positive and negative electrodes of the pouch-type battery cell 11 or short-circuiting of the housings 12 of two pouch-type battery cells 11, an electrical connector 30 with a resistance value is selected to achieve the electrical connection between the first electrode lead-out portion 111 and the housing 12.

[0205] When the resistance value of the electrical connector 30 is too small, the short-circuit voltage cannot be effectively reduced.

[0206] When the resistance value of the electrical connector 30 is too large, it may affect the sampling accuracy and sampling speed. At the same time, it may increase the power loss on the electrical connector 30, resulting in a serious heating problem for the pouch cell unit 11. This will not only affect the accuracy of the sampling circuit but may also cause thermal damage to other parts of the circuit.

[0207] Optionally, the resistance value of the electrical connector 30 is greater than or equal to 1 Ω. For example, the resistance value of the electrical connector 30 can be 1 Ω, 3 Ω, 7 Ω, 15 Ω, 20 Ω, 25 Ω, 30 Ω, 40 Ω, 60 Ω, or any resistance value greater than or equal to 1 Ω.

[0208] It can be understood that multiple electrical connectors 30 with resistance values can be connected in series, parallel, or in a series-parallel hybrid connection so that the resistance value of the electrical connector 30 is within the above range.

[0209] In some embodiments, the electrical connector 30 is used to limit the current flowing through the housing 12 to be less than or equal to 20 A.

[0210] 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 be less than or equal to 20 A. When the positive and negative electrodes of the pouch cell unit 11 are short-circuited or the housings 12 of two pouch cell units 11 are short-circuited, the high voltage between the two electrodes will not cause damage to the pouch cell unit 11. In this way, the electrical connector 30 can play a protective role for the battery device 100.

[0211] Specifically, by controlling the resistance value of the electrical connector 30 or setting other current-limiting components (fuses or circuit breakers) in the sampling circuit, the current flowing through the housing 12 is less than or equal to 20 A. In this way, the sampling circuit and the pouch cell unit 11 can be protected.

[0212] For example, the electrical connector 30 is used to limit the current flowing through the housing 12 to be 20 A, 18 A, 16 A, 14 A, 12 A, 10 A, 8 A, 6 A, 4 A, or 2 A, or any other current value less than 20 A.

[0213] In actual use, the corresponding resistance value of the electrical connector 30 can be selected according to the voltage of the battery device 100 to realize the protection function of the electrical connector 30 for the battery device 100.

[0214] In some embodiments, the maximum withstand voltage of the electrical connector 30 is 100 V.

[0215] In the above technical solution, the maximum withstand voltage value of the electrical connector 30 refers to the maximum voltage that the electrical connector 30 can withstand during the design and manufacturing process, that is, the highest voltage value that the electrical connector 30 can support. Under the specified conditions, the electrical connector 30 can withstand a maximum voltage of 100V without breakdown or damage. In this way, the reliability of the electrical connector 30 can be ensured.

[0216] Specifically, the maximum withstand voltage value, also known as the withstand voltage strength or breakdown voltage, refers to the highest voltage value that the insulated parts between the contact pairs of the electrical connector 30 or between the insulated part and the ground can withstand within a specified time without breakdown.

[0217] Under the specified conditions, the electrical connector 30 can withstand a maximum voltage of 100V without breakdown or damage. In this way, when the battery device 100 is short-circuited and connected due to impact or coolant leakage, the electrical connector 30 can withstand the voltage of multiple parallel-connected pouch battery cells 11, thereby ensuring the reliability of the electrical connector 30.

[0218] In some embodiments, the electrical connector 30 includes at least one of conductive foam and conductive adhesive.

[0219] In the above technical solution, the conductive foam and the conductive adhesive have good electrical conductivity, which can achieve good electrical connection between the first electrode lead-out portion 111 and the housing 12. In addition, the softness of the foam material enables the conductive foam to fit various irregular surfaces, providing close contact and conductive effect. When subjected to pressure, the conductive foam can maintain a certain shape and electrical conductivity, and is not easily deformed or damaged, having good durability. The conductive adhesive can not only provide conductive connection, but also has a high bonding strength, and can firmly bond the connection portion of the first electrode lead-out portion 111 and the housing 12.

[0220] Specifically, the conductive foam has good electrical conductivity through the built-in conductive particles or coating, and the softness of the foam material enables the conductive foam to fit various irregular surfaces, providing close contact and conductive effect. When subjected to pressure, the conductive foam can maintain a certain shape and electrical conductivity, and is not easily deformed or damaged.

[0221] The conductive adhesive contains conductive particles inside, such as metal powder, carbon powder or graphite, etc. These particles form a conductive path in the colloid, making the conductive adhesive have excellent electrical conductivity. At the same time, the conductive adhesive can not only provide conductive connection, but also has a high bonding strength, and can firmly bond the connection portion of the first electrode lead-out portion 111 and the housing 12, thereby reducing the assembly steps.

[0222] The connection part between the first electrode lead-out portion 111 and the housing 12 is connected through a conductive adhesive or a conductive foam. While achieving a good electrical connection, due to the irregular structure of the pouch-shaped battery cell 11, the distance between the first electrode lead-out portion 111 of each pouch-shaped battery cell 11 and the housing 12 may be different. Using a conductive adhesive or a conductive foam allows for a certain error in the distance between the first electrode lead-out portion 111 of different pouch-shaped battery cells 11 and the housing 12.

[0223] In the case of using a 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.

[0224] In the case of using a conductive foam for connection, since the conductive foam has a certain thickness, when the distance between the first electrode lead-out portion 111 and the housing 12 is large, the compression amount of the conductive foam is small; when the distance between the first electrode lead-out portion 111 and the housing 12 is small, the compression amount of the conductive foam is large. Thus, the electrical connector 30 can be adapted to different distances between the first electrode lead-out portion 111 and the housing 12. Further, by setting different numbers of conductive foams, the resistance value of the electrical connector 30 can also be controlled.

[0225] In some embodiments, the battery device includes a first bus bar 40. The first bus bar 40 is electrically connected to the first electrode lead-out portion 111, and an electrical connector connects the first bus bar 40 and the housing 12 to serially connect the first bus bar 40 and the housing 12.

[0226] In the above technical solution, the first bus bar 40 is used for the electrical connection between the first electrode lead-out portions 111 of the pouch-shaped battery cells 11. The first bus bar 40 is electrically connected to the first electrode lead-out portion 111, so that the pouch-shaped battery cells 11 in the energy unit 10 can be connected in series to form a complete battery system, ensuring that current can flow smoothly between the pouch-shaped battery cells 11, and enabling the battery system to output a larger current and a higher voltage. By electrically connecting the first bus bar 40 and the housing 12 through an electrical connector, the electrical connection between the first electrode lead-out portion 111 and the electrical connector can be achieved.

[0227] Specifically, the first bus bar 40 is used for the electrical connection between the first electrode lead-out portions 111 of the pouch-shaped battery cells 11. For example, in an energy unit 10, there are multiple pouch-shaped battery cells 11. The first electrode lead-out portion 111 of each pouch-shaped battery cell 11 is electrically connected to the first bus bar 40, and every two adjacent first bus bars 40 are electrically connected, so that the electrical connection between multiple pouch-shaped battery cells 11 can be achieved.

[0228] The first electrode lead-out portion 111 is electrically connected to the first bus bar 40, and then the first bus bar member and the housing 12 are connected through the electrical connector 30, so that an electrical connection can be established between the housing 12 and the first electrode lead-out portion 111.

[0229] In one embodiment, the first bus bar member includes an electrical connector 30, the electrical connector 30 is fixedly connected to the first bus bar 40. While the first bus bar 40 is electrically connected to the first electrode lead-out portion 111, an electrical connection between the electrical connector 30 and the housing 12 can be achieved.

[0230] 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 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 battery device further includes an insulating member 50, and the insulating member 50 is insulatingly connected to the second electrode connection portion and the housing 12.

[0231] In the above technical solution, the insulating member 50 is disposed between the second electrode connection portion and the housing 12. In this way, an insulating connection between the second electrode lead-out portion 112 and the housing 12 can be ensured, avoiding a short circuit connection between the positive and negative electrodes of the pouch-shaped battery cell 11, and ensuring the reliable operation of the battery device.

[0232] Specifically, the insulating member 50 is disposed between the second electrode connection portion and the housing 12 to ensure an insulating connection between the second electrode lead-out portion 112 and the housing 12, preventing a short circuit and mutual interference between the positive and negative electrodes of the pouch-shaped battery cell 11, so that the sampling circuit operates normally, and at the same time ensuring the reliable operation of the battery device 100.

[0233] In some embodiments, the energy unit 10 includes a first electrode connection portion 101, a second electrode connection portion, a first bus bar 40, and a second bus bar 60. The first bus bar 40 electrically connects the first electrode connection portion 101 and the first electrode lead-out portion 111, and the second bus bar 60 electrically connects the second electrode connection portion and the second electrode lead-out portion 112. The battery device 100 further includes an insulating member 50, and the insulating member 50 is insulatingly connected to the second bus bar 60 and the housing 12.

[0234] In the above technical solution, an insulating connection between the second bus bar 60 and the housing 12 can be ensured, thereby avoiding a short circuit connection between the positive and negative electrodes of the pouch-shaped battery cell 11 and ensuring the reliable operation of the battery device.

[0235] Specifically, the insulating member 50 is disposed between the second bus bar 60 and the housing 12 to ensure an insulating connection between the second electrode lead-out portion 112 and the housing 12, preventing a short circuit and mutual interference between the positive and negative electrodes of the pouch-shaped battery cell 11, so that the sampling circuit operates normally, and at the same time ensuring the reliable operation of the battery device 100.

[0236] In some embodiments, the insulating member 50 is made of plastic material.

[0237] In the above technical solution, the plastic material has good insulation performance, can withstand a certain voltage and current, has good insulation performance, and is stable and reliable.

[0238] Specifically, the plastic material has excellent insulation performance, and at the same time has good heat resistance, corrosion resistance and mechanical strength, making the insulating connection between the second busbar 60 and the housing 12 reliable.

[0239] In some embodiments, the resistance of the insulating member 50 is greater than or equal to 1 MΩ.

[0240] In the above technical solution, the insulating connection between the second electrode lead-out portion and the housing is achieved by providing the insulating member 50. The resistance value of the insulating member 50 is greater than or equal to 1 MΩ, so that the insulating member 50 has a stronger ability to block current, thereby reducing the occurrence of leakage, and ensuring the reliable operation of the battery device.

[0241] Specifically, the resistance value of the insulating member 50 is greater than or equal to 1 MΩ, which can better block current, reduce the occurrence of leakage, and ensure the reliable operation of the circuit. At the same time, the insulating member 50 with a large resistance can withstand a higher electric field strength, reduce the material aging phenomenon caused by the electric field effect, and is beneficial to extending the service life of the insulating member 50 and the battery device 100.

[0242] Furthermore, since the insulating member 50 with a large resistance can withstand a higher electric field strength, the battery device 100 can be allowed to operate at a higher voltage. In this way, the power density and efficiency of the battery device 100 can be improved.

[0243] The resistance value of the insulating member 50 is greater than or equal to 1 MΩ. For example, the resistance value of the insulating member 50 can be 1 MΩ, 2 MΩ, 3 MΩ, 4 MΩ, 5 MΩ, 6 MΩ, 7 MΩ, 8 MΩ or 9 MΩ, or any other value greater than 1 MΩ.

[0244] In some embodiments, the battery device includes a plurality of energy units 10. Each energy unit 10 includes a housing 12 and a plurality of bag-shaped battery monomers 11 arranged side by side and accommodated in the housing 12. The first electrode lead-out portions 111 of the plurality of bag-shaped battery monomers 11 located in the same housing 12 all face the same side and are connected to each other. And, the second electrode lead-out portions 112 of the plurality of bag-shaped battery monomers 11 located in the same housing 12 all face the same side and are connected to each other.

[0245] In the above technical solution, the battery device includes a plurality of energy units 10. The first electrode lead-out portions 111 in each energy unit 10 all face the same side and are connected to each other, and the second electrode lead-out portions 112 all face the same side and are connected to each other. In this way, in one 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, facilitating the arrangement of the sampling assembly on one side of the energy unit 10.

[0246] Specifically, the battery device 100 includes a plurality of energy units 10, and the plurality of energy units 10 can be connected in series or in parallel to enable the energy unit 10 to have a larger output voltage or output current.

[0247] The first electrode lead-out portions 111 in each energy unit 10 all face the same side and are connected to each other, and the second electrode lead-out portions 112 all face the same side and are connected to each other, facilitating the parallel connection between the plurality of pouch-type battery cells 11.

[0248] At the same time, in one 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 assembly 20 to be arranged on one side of the energy unit 10 (such as Figure 5 the right side shown in the figure) by being electrically connected to the housing 12 and the second electrode lead-out portion 112.

[0249] When the plurality of energy units 10 are arranged, the electrode lead-out portions with the same polarity of the pouch-type battery cells 11 in every two energy units 10 face in opposite directions, facilitating the connection between the plurality of energy units 10.

[0250] When the plurality of energy units 10 are arranged, the first electrode lead-out portion 111 is electrically connected to the housing 12 through an electrical connection member 30, and the second electrode lead-out portion 112 is insulated from the housing. The sampling assembly 20 is arranged on the second electrode lead-out portion 112, and voltage sampling of the plurality of arranged energy units 10 on the same side is realized by being electrically connected to the housing 12 and the second electrode lead-out portion 112.

[0251] In some embodiments, an elastic member is provided between adjacent pouch-type battery cells 11 in the same energy unit 10, and / or

[0252] An elastic member is provided between the pouch-type battery cells 11 and the inner wall of the housing 12 along the direction in which the plurality of pouch-type battery cells 11 are arranged side by side.

[0253] In the above technical solution, after the pouch-type battery cell 11 expands, it can squeeze the elastic member, and the elastic member can absorb the expansion amount, thereby reducing the expansion amount of the housing 12 outward to a certain extent and reducing the probability of deformation of the housing 12.

[0254] Specifically, during the long-term use of the battery device, the pouch-type battery cell 11 may expand. In one embodiment, an elastic member is provided between adjacent pouch-type battery cells 11 in the same energy unit 10, and an elastic member is provided between the pouch-type battery cell 11 and the inner wall of the housing 12 along the direction in which a plurality of pouch-type battery cells 11 are arranged side by side. Thus, when one of the adjacent two pouch-type battery cells 11 expands, and / or when the pouch-type battery cell 11 adjacent to the inner wall of the housing 12 expands, the elastic member connected to the expanded pouch-type battery cell 11 can absorb at least a part of the expansion of the pouch-type 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.

[0255] Optionally, in one embodiment, an elastic member is provided between adjacent pouch-type battery cells 11 in the same energy unit 10. Optionally, in one embodiment, an elastic member is provided between the pouch-type battery cell 11 and the inner wall of the housing 12 along the direction in which a plurality of pouch-type battery cells 11 are arranged side by side.

[0256] Optionally, the elastic member is insulated from the housing 12 and the pouch-type battery cell 11. The elastic member can be made of an insulating material or an insulating layer can be coated on the outside of the elastic member. The elastic member includes but is not limited to springs, foams, silica gels, etc.

[0257] In some embodiments, the battery device includes a plurality of energy units 10, the plurality of energy units 10 are arranged in a group, and an insulating layer is provided on the outer surface of the housing 12 so that the housings 12 of two adjacent energy units 10 in the arranged plurality of energy units 10 are insulated from each other.

[0258] In the above technical solution, the plurality of energy units 10 can improve the performance of the battery device, and the insulating layer can ensure the insulation between the housings 12 to a certain extent and provide the reliability of the battery device.

[0259] Optionally, the plurality of energy units 10 can be arranged in a group along the first direction, can also be arranged in a group along the second direction, and can also be arranged in a group along the first direction and the second direction. The plurality of energy units 10 can be connected in series, in parallel, or in a hybrid connection. The hybrid connection can mean that there are both series and parallel connections between the plurality of energy units 10.

[0260] When the energy units 10 are connected in series, the supply voltage of the battery device can be increased. When the energy units 10 are connected in parallel, the supply current of the battery device can be increased.

[0261] The insulating layer on the outer surface of the housing 12 can insulate the housings 12 of two adjacent energy units 10 among the arranged multiple energy units 10, thereby avoiding short - circuit between the housings 12 of two adjacent energy units 10 to a certain extent, and improving the reliability of the battery device.

[0262] The materials of the insulating layer include but are not limited to plastics, foams, silica gels, etc. Optionally, the insulating layer can be adhesively bonded to the outer surface of the housing 12 by means of back glue.

[0263] In some embodiments, the energy unit 10 includes a first electrode connection part 101 and a second electrode connection part. 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. The multiple energy units 10 are arranged in sequence. The relative positions of the electrode lead - out parts with the same polarity of the first electrode connection parts and the second electrode connection parts of two adjacent energy units 10 face in opposite directions, and the adjacent energy units 10 are connected in series.

[0264] In the above - mentioned technical solution, it is convenient to connect adjacent energy units 10 in series, thereby improving the supply voltage of the battery device.

[0265] Specifically, the first electrode connection part 101 and the second electrical connection part 13 can be respectively the positive - electrode connection part 13 and the negative - electrode connection part 13 of the energy unit 10. The relative positions of the first electrode connection part 101 and the second electrode connection part of two adjacent energy units 10 are opposite, so that the first electrode connection part 101 of one energy unit 10 and the second electrode connection part of another energy unit 10 can be on the same side of the battery device, and the second electrode connection part of one energy unit 10 and the first electrode connection part 101 of another energy unit 10 can be on the same side of the battery device. Thus, it is convenient to connect the first electrode connection part 101 and the second electrode connection part on the same side of two adjacent energy units 10, as well as the second electrode connection part and the first electrode connection part 101 on the other same side, to realize the series connection of two adjacent energy units 10.

[0266] The multiple pouch - type battery monomers 11 in the same energy unit 10 can be connected in series, in parallel or in a hybrid connection. The first electrode connection part 101 can be electrically connected to one of the first electrode lead - out parts 111, and the second electrode connection part can be electrically connected to one of the second electrode lead - out parts 112.

[0267] In some embodiments, the energy unit 10 includes a first electrode connection part 101 and a second electrode connection part. 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.

[0268] The battery device includes a plurality of energy units 10 arranged in groups, and the battery device further includes a bus bar for connecting different energy units 10. The bus bar 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 bus bar.

[0269] In the above technical solution, the bus bar can be used to electrically connect the first electrode lead-out portion 111 to the housing 12.

[0270] Specifically, the bus bar can connect different energy units 10 so that different energy units 10 can form an electrical connection, such as series connection, parallel connection, or mixed connection. Optionally, the bus bar may include a tab.

[0271] The bus bar 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 bus bar. Thus, the sampling assembly can be electrically connected to the first electrode lead-out portion 111 through the housing 12 and the bus bar, facilitating the arrangement of the sampling wire harness and reducing the number of sampling wire harnesses, and also reducing additional connectors.

[0272] In some embodiments, the plurality of energy units 10 arranged in groups include first energy units 10 and second energy units 10 arranged alternately. The housing 12 of the first energy unit 10 is electrically connected to the bus bar, and the housing 12 of the second energy unit 10 is insulated from the bus bar.

[0273] In the above technical solution, since the bus bar is connected to a plurality of energy units 10 at the same time, the potential of the bus bar can be transmitted using only the housing of one of the energy units 10, so that the charged housing and the uncharged housing in the plurality of energy units 10 arranged in groups are arranged alternately. Thus, the distance between the housings 12 with different potentials can be increased, reducing the short-circuit risk and improving the reliability.

[0274] Specifically, the plurality of energy units 10 arranged in groups include first energy units 10 and second energy units 10 arranged alternately. The housing 12 of the first energy unit 10 is electrically connected to the bus bar, making the housing 12 of the first energy unit 10 charged. The housing 12 of the second energy unit 10 is insulated from the bus bar, making the housing 12 of the second energy unit 10 uncharged. Thus, the charged housing and the uncharged housing in the plurality of energy units 10 arranged in groups are arranged alternately, increasing the distance between two adjacent charged housings 12.

[0275] A first energy unit 10 is provided between two adjacent second energy units 10, increasing the distance between two adjacent uncharged housings 12, thereby improving the safety of the battery device to a certain extent.

[0276] In some embodiments, please refer to Figure 7 and Figure 8 , the housing 12 includes a first opening 122 and two second openings 123 opposed to 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.

[0277] The battery device includes a box body. The energy unit 10 is located on the inner bottom wall of the box body. The housing 12 includes two first end walls 124 that form the first opening 122. The first end walls 124 face the inner bottom wall. Insulation layers are provided on the inner side wall surface, the outer side wall surface, and the transition wall surface connecting the inner side wall surface and the outer side wall surface of the first end walls 124.

[0278] In the above technical solution, insulation between the housing 12 and the inner bottom wall of the box body can be achieved.

[0279] Optionally, the first opening 122 can be used for placing the pouch-type battery cell 11 into the housing 12, and the two second openings 123 can be used for respectively connecting the first electrode lead-out portion 111 and the second electrode lead-out portion 112 of the pouch-type battery cell 11 to components outside the housing 12 (such as a bus bar, a bus bar component, etc.).

[0280] Optionally, in one embodiment, please refer to Figure 4 and Figure 8 , the first direction intersects the second direction perpendicularly. The first direction can be the left-right direction shown in the figure, and the second direction is the up-down direction shown in the figure. The first opening 122 is located on one side of the two second openings 123 along the downward direction and communicates with the two first openings 122. Optionally, in other embodiments, the first direction and the second direction can intersect obliquely.

[0281] The first end walls 124 face the inner bottom wall, so that the housing 12 can be connected to the inner bottom wall of the box body through the two first end walls 124 that form the first opening 122. Insulation layers are provided on the inner side wall surface, the outer side wall surface, and the transition wall surface connecting the inner side wall surface and the outer side wall surface of the first end walls 124, so that the first end walls 124 are insulated from the inner bottom wall of the box body, thereby insulating the housing 12 from the inner bottom wall of the box body.

[0282] The insulation layer includes but is not limited to plastics, foams, silica gels, etc.

[0283] In some embodiments, the housing 12 includes a first opening 122 and two second openings 123 opposed to 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.

[0284] The battery device includes a box body, and the energy unit 10 is located on the inner bottom wall of the box body. The housing 12 includes two first end walls 124 that form the first opening 122, and the first end wall 124 and the inner bottom wall of the box body are insulated and connected by an insulating adhesive.

[0285] In the above technical solution, insulation between the housing 12 and the inner bottom wall of the box body can be achieved.

[0286] Optionally, the first opening 122 can be used for placing the pouch-type battery cell 11 into the housing 12, and the two second openings 123 can be used for connecting the first electrode lead-out portion 111 and the second electrode lead-out portion 112 of the pouch-type battery cell 11 to components outside the housing 12 (such as a bus bar, a bus bar component, etc.).

[0287] Optionally, in one embodiment, the first direction intersects the second direction perpendicularly. The first direction can be the left-right direction shown in the figure, the second direction is the up-down direction shown in the figure, and the first opening 122 is located on one side of the two second openings 123 along the downward direction and communicates with the two first openings 122. Optionally, in other embodiments, the first direction and the second direction can intersect obliquely.

[0288] The first end wall 124 and the inner bottom wall of the box body are insulated and connected by an insulating adhesive, so that the first end wall 124 is insulated from the inner bottom wall of the box body, thereby insulating the housing 12 from the inner bottom wall of the box body.

[0289] Optionally, the insulating adhesive can also fix the energy unit 10 on the inner bottom wall of the box body by fixing the first end wall 124.

[0290] In some embodiments, the housing 12 includes a first opening 122 and two second openings 123 opposed to each other along the first direction. The first opening 122 is located on one side of the two second openings 123 along the second direction and communicates with the two first openings 122, and the second direction intersects the first direction.

[0291] The housing 12 further includes a first housing wall 121. The first housing wall 121 is opposite to the first opening 122 along the second direction. The sampling assembly is located outside the first housing wall 121, and a pressure relief structure 16 is further provided on the first housing wall 121.

[0292] In the above technical solution, when the pouch-type battery cell 11 undergoes thermal runaway and expands to exhaust and relieve pressure, the pressure relief structure 16 guides the discharged gas to relieve pressure in a specific direction, reducing the risk of the discharged gas affecting the surrounding pouch-type battery cells 11 due to random flow. Thus, the risk of serious thermal runaway of the energy unit 10 can be reduced, which is beneficial to the thermal runaway management of the battery device and improves the reliability of the battery device.

[0293] The pressure relief structure 16 can refer to a structure or component that can be opened to exhaust and relieve pressure after the pressure inside the housing 12 reaches a preset value. Exemplarily, the pressure relief structure 16 can be an explosion-proof valve.

[0294] Optionally, the pressure relief structure 16 is configured to include, but is not limited to, a pressure relief hole, a score, or a weakened portion.

[0295] The pressure relief structure 16 may be configured as a pressure relief hole. When the exhaust gas pressure relief of the pouch-type battery cell 11 causes an increase in the internal pressure of the housing 12, the gas can flow to the pressure relief hole to exhaust the gas outward for pressure relief.

[0296] The score may refer to structures such as indentations or grooves scribed on the first housing wall 121 of the housing 12. When the gas pressure inside the housing 12 is relatively high, the position where the score is located has a lower strength compared to other positions on the first housing wall 121, and the probability of rupture is relatively high. The gas can break through the position where the score is located for exhaust gas pressure relief.

[0297] The weakened portion may refer to a structure with relatively low strength formed on the first housing wall 121. For example, the weakened portion may refer to a region where the wall thickness of the first housing wall 121 is thinned, or a structure formed by opening a hole on the first housing wall 121 and covering it with a thin film. When the gas pressure inside the housing 12 is relatively high, the probability of rupture of the weakened portion is relatively high, and the gas can break through the position where the weakened portion is located for exhaust gas pressure relief.

[0298] The housing 12 is used to accommodate one or more pouch-type battery cells 11. When the pouch-type battery cell 11 undergoes thermal runaway and the internal gas expands by a large volume, causing the outer shell of the pouch-type battery cell 11 to rupture, it will exhaust gas outward for pressure relief. The discharged high-temperature gas will cause the pressure relief structure 16 to crack for exhaust, guiding the discharged gas for directional pressure relief.

[0299] Optionally, in one embodiment, the first direction intersects the second direction perpendicularly. The first direction may be the left-right direction shown in the figure, and the second direction is the up-down direction shown in the figure. The first opening 122 is located on one side of the two second openings 123 along the downward direction and communicates with the two first openings 122. The first housing wall 121 is the upper housing wall 12. Optionally, in other embodiments, the first direction and the second direction may intersect obliquely.

[0300] Optionally, in one embodiment, one or more pressure relief structures 16 may be provided on the first housing wall 121.

[0301] In some embodiments, the sampling assembly and the pressure relief structure 16 are arranged in a staggered manner on the first housing wall 121.

[0302] In the above technical solution, when the energy unit 10 exhausts gas for pressure relief, it protects the sampling assembly to a certain extent.

[0303] Specifically, the sampling component and the pressure relief structure 16 are arranged 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 directly spray onto the sampling component at a close distance and cause damage to the sampling component, thereby protecting the sampling component to a certain extent.

[0304] Optionally, in one embodiment, the pressure relief structure 16 is provided at the top of the housing 12, and the sampling component is provided on the left or right side of the housing 12.

[0305] In some embodiments, the housing 12 has a connection portion 13 for electrically connecting the sampling component. The sampling component is arranged between the connection portion 13 and the second electrode connection portion, and the pressure relief structure 16 is arranged between the connection portion 13 and the first electrode connection portion 101.

[0306] In the above technical solution, the sampling component can be arranged far away from the pressure relief structure 16, further reducing or avoiding damage to the sampling component when the pressure relief structure 16 exhausts gas.

[0307] The connection portion 13 is used for electrically connecting the sampling component, so that the sampling component can be connected to the first electrode connection portion 101 through the connection portion 13 and the housing 12, and thus connected to the first electrode lead-out portion 111. The sampling component can collect the parameter information of the first electrode lead-out portion 111. The sampling component can be electrically connected to the second electrode lead-out portion 112 through the first electrode connection portion 101 to collect the parameter information of the second electrode lead-out portion 112.

[0308] Please combine Figure 7 and Figure 8 , the second electrode connection portion and the second electrode lead-out portion 112 can be located on the left side of the energy unit 10, the first electrode connection portion 101 and the first electrode lead-out portion 111 can be located on the right side of the energy unit 10, the sampling component can be located between the connection portion 13 and the second electrode connection portion, and the pressure relief structure 16 is located between the connection portion 13 and the first electrode connection portion 101, so that the sampling component is arranged far away from the pressure relief structure 16, further reducing or avoiding damage to the sampling component when the pressure relief structure 16 exhausts gas.

[0309] In addition, the sampling component can be located between the connection portion 13 and the second electrode connection portion, which can also reduce the space occupied by the energy unit 10 in the first direction, facilitating the structural compactness of the energy unit 10.

[0310] In some embodiments, a protective member is provided on the outer side of the first housing wall 121, and the protective member is used to cover at least a part of the first housing wall 121 of the energy unit 10.

[0311] In the above embodiments, the protective member can, to a certain extent, prevent the problem that high-temperature substances fall back onto the adjacent charged housing 12 after the pressure relief structure 16 exhausts gas, thereby improving the reliability of the battery device.

[0312] Specifically, the protective member is used to cover at least a first housing wall 121 of one energy unit 10, so that the pressure relief structure 16 is covered by the protective member. When the pressure relief structure 16 on the covered first housing wall 121 exhausts gas, the discharged high-temperature substances will be blocked by the protective member and cannot fall back onto another adjacent charged housing 12, thereby avoiding the short circuit of the charged housing 12 and improving the reliability of the battery device.

[0313] It is optionally described in the specification that, in one embodiment, the protective member can be made of a high-temperature resistant material, such as mica material, to prevent high-temperature substances from falling back and connecting to the adjacent charged housing 12 after the spray valve, causing a short circuit.

[0314] Optionally, in one embodiment, the battery device includes a plurality of protective members. One protective member can cover the corresponding first housing wall 121 of one energy unit 10, and the plurality of protective members can be connected along the arrangement direction of the plurality of energy units 10.

[0315] Optionally, in one embodiment, the battery device includes a plurality of protective members, and the plurality of protective members can be connected along the arrangement direction of the plurality of energy units 10. The number of protective members is less than the number of energy units 10. Each protective member can cover the first housing walls 121 of two or more energy units 10, and the plurality of protective members can be connected along the arrangement direction of the plurality of energy units 10. In one embodiment, one or some of the protective members can cover the first housing walls 121 of two or more energy units 10, and one or some of the protective members can cover the corresponding first housing wall 121 of one energy unit 10.

[0316] Optionally, in one embodiment, the first housing wall 121 of a certain or some energy units 10 is covered with a protective member, and the first housing wall 121 of a certain or some energy units 10 has no protective member.

[0317] In some embodiments, please refer to Figure 10 , the battery device includes a box body, the energy unit 10 is located inside the box body, and the housing 12 is connected to the box body by a thermal conductive adhesive 15.

[0318] In the above technical solution, the box body and the housing 12 are fixedly connected by the thermal conductive adhesive 15. On the one hand, the box body and the housing 12 can be reliably connected and fixed, and on the other hand, it is beneficial to the heat exchange of the battery device.

[0319] In some embodiments, the box body includes a box body main body and a heat exchange plate 14. The heat exchange plate 14 is connected to the box body main body and jointly defines a receiving space with the box body main body, and the energy unit 10 is bonded to the heat exchange plate 14.

[0320] In the above technical solution, by adhesively fixing the energy unit 10 on the heat exchange plate 14, the heat exchange plate 14 can perform highly efficient heat exchange on the pouch-type battery cell 11, quickly adjust the temperature of the pouch-type battery cell 11, which is beneficial to improving the reliability of the pouch-type battery cell 11, and further improving the reliability of the battery device.

[0321] In some embodiments, the heat exchange plate 14 is arranged at the bottom of the box body main body.

[0322] In the above technical solution, since the heat exchange plate 14 is arranged between the pouch-type battery cell 11 and the bottom wall of the box body, the heat exchange plate 14 can not only perform highly efficient heat exchange on the pouch-type battery cell 11, but also play a protective role. When the bottom of the box body is subjected to external mechanical impact, the heat exchange plate 14 can play a buffering role, reduce the damage caused by the external mechanical impact to the pouch-type battery cell 11, can reduce the risk of damage to the pouch-type battery cell 11, improve the reliability of the energy unit 10, and further improve the reliability of the battery device.

[0323] In some embodiments, the pouch-type battery cell 11 is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

[0324] Among them, the solid-state battery cell can be, but is not limited to, a polymer solid-state battery cell, an oxide solid-state battery cell, a sulfide solid-state battery cell, a halide solid-state battery cell, etc. The solid-state battery cell can also be a semi-solid-state battery cell or a full-solid-state battery cell.

[0325] In the above technical solution, using the above types of pouch-type battery cells 11 can provide more choices for the design of the battery device to meet different usage requirements. Among them, when the pouch-type battery cell 11 is a lithium iron phosphate battery cell, it has the advantages of high reliability, long cycle life, light weight, large capacity, and small internal resistance; when the pouch-type battery cell 11 is a ternary battery cell, it has the advantages of high energy density and good electrochemical performance; when the pouch-type battery cell 11 is a solid-state battery cell, it has the advantages of high energy density, high reliability, light weight, and good high and low temperature performance.

[0326] In some embodiments, the pouch-type battery cell 11 is a lithium iron phosphate battery cell, and in the positive electrode material of the pouch-type battery cell 11, the dosage ratio of the positive electrode active material, the binder, and the conductive agent is 96:(1 - 3):(1 - 3); when the pouch-type battery cell 11 is a ternary battery cell, and in the positive electrode material of the pouch-type battery cell 11, the dosage ratio of the positive electrode active material, the binder, and the conductive agent is 96:(2 - 3):(1 - 2).

[0327] In the above technical solution, when the pouch battery cell 11 is a lithium iron phosphate battery cell, a high proportion of the positive electrode active material means that more substances capable of undergoing electrochemical reactions can be accommodated within a limited electrode assembly, which is beneficial to increasing the capacity and energy density of the battery device. This enables the lithium iron phosphate battery cell to output a higher amount of electricity while being relatively small in volume and weight, meeting application scenarios with certain requirements for energy density. Using the above ranges for the amounts of the binder and the conductive agent can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device. When the pouch battery cell 11 is a ternary battery cell, due to the relatively complex structure and surface properties of the ternary material itself, using the above dosage ratios of the positive electrode active material, the binder, and the conductive agent is beneficial to ensuring good adhesion between the positive electrode active material particles and between the active material and the current collector, thereby improving the mechanical stability and integrity of the electrode assembly, reducing the risk of shedding of the active material and electrode pulverization during charge and discharge, and extending the cycle life of the battery device.

[0328] In some embodiments, the positive electrode of the pouch battery cell 11 may be a positive electrode tab, and the positive electrode tab may include a positive electrode current collector and a positive electrode film layer provided on at least one surface of the positive electrode current collector, and the positive electrode film layer includes a positive electrode active material.

[0329] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode film layer is provided on either or both of the two opposite surfaces of the positive electrode current collector.

[0330] As an example, the positive electrode current collector may be made of a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, aluminum or stainless steel with silver surface treatment, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (such as 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.).

[0331] As an example, when the pouch battery cell 11 of the embodiment of the present application 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 battery cell 11. However, the present application is not limited to these materials, and other conventional materials that can be used as the battery positive electrode film layer may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0332] Examples of phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which may also be abbreviated as LFP)), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), composite materials of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and composite materials of lithium manganese iron phosphate and carbon.

[0333] Examples of layered transition metal oxides may include, but are not limited to, at least one of lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (which may also be abbreviated as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which may also be abbreviated as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which may also be abbreviated as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which may also be abbreviated as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which may also be abbreviated as NCM 811 ), LiNi 0.9 Co 0.05 Mn 0.05 O2 (which may also be abbreviated as Ni90), lithium nickel cobalt aluminum oxide (such as LiNi 0.80 Co 0.15 Al 0.05 O2) and their modified compounds, etc.

[0334] When the pouch cell monomer 11 in the embodiment of the present application 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, polyanion materials (such as phosphates, fluorophosphates, pyrophosphates, sulfates, etc.), and Prussian blue materials.

[0335] As an example, the positive electrode active material for a sodium-ion battery may include NaFeO2, NaCoO2, NaCrO2, NaMnO2, NaNiO2, 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 - like materials, at least one of the materials with the general formula X p M’ q (PO4) r O x Y 3-x In the general formula X p M’ q (PO4) r O x Y 3-x , 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 halogen anion, optionally at least one of F, Cl and Br.

[0336] In the embodiments of the present application, the modified compounds of the above - mentioned cathode active materials can be doping modification and / or surface - coating modification of the cathode active materials, such as carbon - coating modification, fast - ion - conductor - coating modification, etc.

[0337] During the charge - discharge process of the pouch - type battery cell 11, the insertion and extraction and consumption of active ions such as Li will occur, and the molar content of Li is different when the pouch - type battery cell 11 is discharged to different states. In the listing of the cathode active materials in the embodiments of the present application, the molar content of Li is the initial state of the material, that is, the state before feeding. When the cathode active material is applied to the battery system and undergoes charge - discharge cycles, the molar content of Li may change.

[0338] In the listing of the cathode active materials in the embodiments of the present application, the molar content of oxygen O is only the theoretical state value. The release of oxygen from the lattice will cause the molar content of oxygen O to change. Actually, the molar content of oxygen O will show fluctuations.

[0339] In the embodiments of the present application, the content of elements in the positive electrode active material has the meaning well-known in the art, and can be detected by using the equipment and methods well-known in the art. For example, referring to EPA 6010D-2014, it is tested by inductively coupled plasma atomic emission spectrometry, and determined by inductively coupled plasma optical emission spectrometry (ICP-OES, instrument model: Thermo ICAP7400). First, 0.4 g of the positive electrode active material is weighed, and 10 ml (50% concentration) of aqua regia is added thereto. Then it is placed on a flat plate at 180 °C for 30 min. After digestion on the flat plate, it is fixed to a volume of 100 mL, and quantitative testing is carried out by the standard curve method.

[0340] In some embodiments, the positive electrode can be made of porous metal. The porous metal can be porous nickel, porous copper, porous aluminum, porous alloy, or porous carbon, etc. When the porous metal is used as the positive electrode, a positive electrode film layer may not be provided on the surface of the porous metal, and of course, a positive electrode film layer can also be provided. As an example, a lithium source material, potassium metal or sodium metal can also be filled and / or deposited in the porous metal, and the lithium source material is lithium metal and / or lithium-rich material.

[0341] In some embodiments, the positive electrode film layer may further optionally include a positive electrode conductive agent. The embodiments of the present application do not particularly limit the type of the positive electrode conductive agent. As an example, the positive electrode conductive agent includes at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage content of the positive electrode conductive agent in the positive electrode film layer is ≤5 wt%.

[0342] In some embodiments, the positive electrode film layer may further optionally include a positive electrode binder. The embodiments of the present application do not particularly limit the type of the positive electrode binder. As an example, the positive electrode binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, and fluorinated acrylate resin. In some embodiments, the mass percentage content of the positive electrode binder in the positive electrode film layer is ≤5 wt%.

[0343] The positive electrode film layer is usually formed by coating the positive electrode slurry on the positive electrode current collector and 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 evenly. The solvent can be N-methylpyrrolidone (NMP), but is not limited thereto.

[0344] In some embodiments, the negative electrode can be a negative electrode plate, and the negative electrode plate can include a negative electrode current collector and a negative electrode film layer provided on at least one surface of the negative electrode current collector, and the negative electrode film layer includes a negative electrode active material.

[0345] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode film layer is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0346] As an example, the negative electrode current collector can be a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. The composite current collector can include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as substrates of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0347] As an example, the negative electrode active material can be the negative electrode active material known in the art for the pouch cell monomer 11. As an example, the negative electrode active material can include at least one of the following materials: carbon materials (for example, the 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. The silicon-based materials can include at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can include at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as the battery negative electrode film layer can also be used. These negative electrode film layers can be used alone or in combination of two or more.

[0348] In some embodiments, the negative electrode active material includes silicon element, and the silicon element can exist in the form of silicon-based materials. For example, the silicon-based materials can include at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys.

[0349] In some embodiments, the mass content of silicon element in the negative electrode film layer is 1 wt% to 32 wt%, optionally 2 wt% to 19 wt%, and further optionally 6 wt% to 13 wt%. In the pouch cell monomer 11 system, when the mass content of silicon element is within the above range, the energy density of the pouch cell monomer 11 can be improved.

[0350] In the embodiments of the present application, the mass content of silicon element in the negative electrode film layer has the meaning well-known in the art, and can be detected by using the equipment and methods well-known in the art. For example, the negative electrode sheet is placed in a solvent such as water for soaking to separate the negative electrode active material from the negative electrode current collector, and the negative electrode active material is obtained by suction filtration. Then, the negative electrode active material is analyzed by using an inductively coupled plasma - emission spectrometer of model ICAP7400 from ThermoFisher Scientific Company in the United States, and referring to the standard of GB / T30902 - 2014, the content of silicon element can be obtained.

[0351] In some embodiments, the negative electrode film layer may further optionally include a negative electrode conductive agent. There is no particular limitation on the type of the negative electrode conductive agent in the embodiments of the present application. As an example, the negative electrode conductive agent may include at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage content of the negative electrode conductive agent in the negative electrode film layer is ≤5 wt%.

[0352] In some embodiments, the negative electrode film layer may further optionally include a negative electrode binder. There is no particular limitation on the type of the negative electrode binder in the embodiments of the present application. As an example, the negative electrode binder may include at least one of styrene - butadiene rubber (SBR), water - soluble unsaturated resin SR - 1B, water - based acrylic resins (for example, 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 content of the negative electrode binder in the negative electrode film layer is ≤5%.

[0353] In some embodiments, the negative electrode film layer may further optionally include other additives. As an example, the other additives may include thickeners, such as sodium carboxymethyl cellulose (CMC - Na), PTC thermistor materials, etc. In some embodiments, the mass percentage content of the other additives in the negative electrode film layer is ≤2 wt%.

[0354] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0355] In some embodiments, the separator includes a separator membrane. There is no particular limitation on the type of the separator membrane in the present application, and any well - known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0356] There is no particular limitation on the type of the separator membrane in the embodiments of the present application, and any well - known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0357] In some embodiments, the material of the separator membrane may include one or more of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator membrane may be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation.

[0358] In some embodiments, the separator membrane may include a porous base film and a coating disposed on at least one side of the porous base film, and the coating may include at least one of inorganic particles or organic particles.

[0359] The porous base film may include one or more of polyethylene and polypropylene.

[0360] The inorganic particles have good heat resistance and can improve the overall heat resistance of the separator membrane. The inorganic particles basically do not undergo oxidation and reduction reactions with metal dendrites within the working voltage range of the sodium-ion battery. In other words, the inorganic particles are configured not to undergo oxidation and reduction reactions with alkali metals and / or alkaline earth metals at the nominal voltage of the sodium-ion battery.

[0361] In some embodiments, the inorganic particles include one or more of boehmite γ-AlOOH, alumina Al2O3, aluminum hydroxide Al(OH)3, barium sulfate BaSO4, magnesium oxide MgO, magnesium hydroxide Mg(OH)2, calcium oxide CaO, cerium oxide CeO2, strontium titanate SrTiO3, barium titanate BaTiO3, and magnesium fluoride MgF2.

[0362] In some embodiments, the organic particles include at least one of polystyrene, polyethylene, polyimide, melamine resin, phenolic resin, polypropylene, polyester (such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate), polyphenylene sulfide, polyaramide, polyamideimide, polyimide, copolymer of butyl acrylate and ethyl methacrylate, and mixtures thereof.

[0363] In some embodiments, the pouch-type battery cell 11 further includes an electrolyte solution.

[0364] During the charge and discharge process of the battery cell, active ions are embedded and extracted back and forth between the positive electrode plate and the negative electrode plate, and the electrolyte solution plays a role in conducting active ions between the positive electrode plate and the negative electrode plate. There is no particular limitation on the type of the electrolyte solution in the embodiments of the present application, and it can be selected according to actual needs.

[0365] The electrolyte solution includes an electrolyte salt and a solvent. The types of the electrolyte salt and the solvent are not specifically limited and can be selected according to actual needs.

[0366] In some embodiments, the electrolyte may optionally further 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 performances, such as additives for improving the overcharge performance of the battery, additives for improving the high-temperature performance of the battery, additives for improving the low-temperature power performance of the battery, and the like.

[0367] For example, the additives include at least one of a cyclic carbonate compound containing an unsaturated bond, a sulfate compound, a sulfite compound, a sultone compound, a disulfonic acid compound, a nitrile compound, an aromatic compound, an isocyanate compound, a phosphazene compound, an acid anhydride, a cyclic acid anhydride compound, a phosphite compound, a phosphate compound, a borate ester, and a carboxylate compound.

[0368] It can be understood that when the pouch cell monomer 11 is a lithium iron phosphate battery monomer, in the positive electrode material of the pouch cell monomer 11, the positive electrode active material accounts for 96 parts by weight of the total weight of the positive electrode material, the binder accounts for 1 to 3 parts by weight of the total weight of the positive electrode material (for example, it may include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1 to 3 parts by weight of the total weight of the positive electrode material (for example, it may include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.).

[0369] Exemplarily, when the pouch cell monomer 11 is a lithium iron phosphate battery monomer, the positive electrode active material is LFP (which may refer to LiFePO4, that is, lithium iron phosphate), the binder may be PVDF (polyvinylidene fluoride), and the conductive agent may be conductive carbon black. Among them, LFP:PVDF:conductive carbon black may be 96:2:2. That is to say, the total weight of the positive electrode active material is divided into 100 parts, LFP accounts for 96 parts, PVDF accounts for 2 parts, and conductive carbon black also accounts for 2 parts. Among them, the weight unit of the positive electrode active material may be grams.

[0370] When the pouch cell monomer 11 is a ternary battery monomer, in the positive electrode material of the pouch cell monomer 11, the positive electrode active material accounts for 96 parts by weight of the total weight of the positive electrode material, the binder accounts for 2 to 3 parts by weight of the total weight of the positive electrode material (for example, it may include but is not limited to 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1 to 2 parts by weight of the total weight of the positive electrode material (for example, it may include but is not limited to 1, 1.2, 1.5, 1.8, 2, etc.). Among them, the ternary battery monomer may be but is not limited to lithium nickel cobalt manganese oxide series, lithium nickel cobalt aluminate series, and the like.

[0371] Exemplarily, the ternary material of the ternary battery monomer may be the eight-series LiNi 0.8 Co 0.1 Mn 0.1O2, the weight ratio of the cathode active material, binder, and conductive agent is 96:2.5:1.5. That is to say, the total weight of the cathode material is divided into 100 parts, and the eight-series LiNi 0.8 Co 0.1 Mn 0.1 O2 accounts for 96 parts, the binder accounts for 2.5 parts, and the conductive agent accounts for 1.5 parts.

[0372] In the above technical solution, when the pouch battery cell 11 is a lithium iron phosphate battery cell, the high proportion of the cathode active material means that more substances capable of undergoing electrochemical reactions can be accommodated within the limited electrode assembly, which is beneficial to increasing the capacity and energy density of the battery device 100. This enables the lithium iron phosphate battery cell to output a higher amount of electricity under relatively small volume and weight, meeting the application scenarios with certain requirements for energy density. Using the above ranges for the amounts of the binder and conductive agent can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device 100. When the pouch battery cell 11 is a ternary battery cell, due to the relatively complex structure and surface properties of the ternary material itself, using the above dosage ratios of the cathode active material, binder, and conductive agent is beneficial to ensuring good adhesion between the cathode active material particles and between the active material and the current collector, thereby improving the mechanical stability and integrity of the electrode assembly, reducing the risk of shedding of the active material and electrode pulverization during charge and discharge, and extending the cycle life of the battery device 100.

[0373] In some embodiments, the pouch battery cell 11 is a ternary battery cell, the housing 12 includes a first opening 122, a plurality of pouch battery cells 11 are received within the housing 12, the housing 12 further includes a first housing wall 121, the first housing wall 121 is opposite to the first opening 122 along a second direction, and the first housing wall 121 is provided with a pressure relief structure 16.

[0374] In the above technical solution, the pressure relief structure 16 can guide the discharged gas to relieve pressure in a directional manner when the ternary battery cell undergoes thermal runaway expansion and exhausts pressure, reducing the risk of the discharged gas disturbing the surrounding ternary battery cells, and thus reducing the risk of serious thermal runaway of the energy unit composed of ternary battery cells, which is beneficial to the thermal runaway management of the energy unit 10 and improving the reliability of the energy unit 10 composed of ternary battery cells.

[0375] In some embodiments, the pressure relief structure 16 is configured as a pressure relief hole; alternatively, the pressure relief structure is configured as a notch; alternatively, the pressure relief structure is configured as a weakened portion.

[0376] In the above technical solution, more choices can be provided for the design of the pressure relief structure 16 to meet different usage requirements.

[0377] In some embodiments, an insulating layer is provided on the outer surface of the housing 12 so that the housings 12 of two adjacent energy units 10 among the arranged plurality of energy units 10 are insulated from each other.

[0378] In the above technical solution, the battery device 100 includes a plurality of arranged energy units 10. The energy unit 10 includes a housing 12 and a pouch-type battery cell 11 in the housing 12. The housing 12 is electrically connected to the first electrode lead-out portion 111 of the pouch-type battery cell 11, that is, the housing 12 and the first electrode lead-out portion 111 have the same electric potential. Therefore, the housings 12 of the plurality of energy units 10 cannot be in direct contact with 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 insulated from each other. In this way, it is possible to avoid short circuits caused by the housings 12 coming into contact with each other.

[0379] Specifically, since the housing 12 of the energy unit 10 is electrically connected to the first electrode lead-out portion 111 of the pouch-type battery cell 11, when a plurality of energy units are arranged, insulation treatment needs to be performed between adjacent housings 12.

[0380] Optionally, an insulating film is provided on the outer surface of the housing 12. The insulating film is usually 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 voltage resistance, no residual glue, explosion-proof and flame-retardant properties, etc.

[0381] The insulating film mainly provides electrical insulation to prevent the battery housing 12 from coming into direct contact with external conductive objects, thereby avoiding the risks of short circuits and electric shocks. In addition, the insulating film can also effectively block moisture and humidity from entering the battery interior, protecting the battery from corrosion and damage.

[0382] In one embodiment, the insulating film includes a power battery insulating blue film. This kind of insulating film is commonly used for the external protection of power batteries. It uses a PET substrate and is coated with an oily acrylic pressure-sensitive adhesive or a silicone pressure-sensitive adhesive. It has good adhesion to steel and aluminum housings and has the advantages of no warping, good toughness, scratch resistance, puncture resistance, etc.

[0383] In a second aspect, the present application provides an energy storage device 1, which includes a plurality of battery devices 100 in any of the above embodiments. The battery device 100 is used to store or provide electric energy.

[0384] The energy storage device can be used in an energy storage power station, a wind power generation system, a solar power generation system, a mobile power system, or a temporary power supply system, etc. The energy storage device can store electric energy as needed and output electric energy at an appropriate time. For example, the energy storage device can store electric energy during low electricity consumption periods and provide electric energy to relevant users or electrical devices during high electricity consumption periods.

[0385] In a third aspect, the present application provides an energy storage system, which includes a power conversion device 2 and the energy storage device 1 in the above embodiments. The power conversion device 2 is used to electrically connect a power generation device and the energy storage device 1.

[0386] The energy storage system provided by the embodiments of the present application can be any power system that requires the use of an energy storage device.

[0387] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0388] In some embodiments, the energy storage device may include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0389] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a total control module, a power distribution module, and a fire protection module.

[0390] As an example, the thermal management module may include a liquid cooling unit, and the liquid cooling unit provides a coolant for adjusting the temperature of battery cells to each battery device through pipelines.

[0391] As an example, the main control module can serve as the battery management unit of the battery cluster for monitoring and managing the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For example, it can control the charge and discharge current, voltage, etc. of the battery cluster. The main control module includes an auxiliary battery management unit SBMU (Slave Battery Management Unit, SBMU), a fusion switch, and other modules.

[0392] As an example, the total control module can serve as the battery management unit of the energy storage device for monitoring and managing the energy storage device. The total control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device. For example, it can control the charge and discharge current, voltage, etc. of the energy storage device. As an example, the total control module includes an insulation monitoring module IMM (Insulation Monitoring Module, IMM), a main battery management unit MBMU (Master Battery Management Unit, MBMU), an Ethernet ETH (EtherNet, ETH), and a fiber optic conversion module, and other modules.

[0393] As an example, the fire protection system includes a control panel, detectors, alarm devices, etc., and is used for detecting, alarming, or extinguishing fires in the energy storage system.

[0394] As an example, the power distribution device can be used to distribute power to the power consumption modules of the energy storage device.

[0395] In some embodiments, such as Figure 1As shown, the energy storage system may include one or more energy storage devices 1 and a power conversion device 2 (Power Converter System, PCS). The power conversion device 2 is used to connect between the power generation device 3 and the energy storage device 1. The power generation device 3 is used to generate electric energy, and the electric energy generated by the power generation device 3 can be stored in the energy storage device 1 through the power conversion device 2. As an example, the power generation device 3 may specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. Among them, the specific type of the power generation device 3 is not limited in this application.

[0396] In a fourth aspect, this application provides an electrical device, which 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 for the electrical device.

[0397] In a fifth aspect, an embodiment of this application provides a charging network, which includes a charging pile and the energy storage device or the energy storage system in the above embodiments. The energy storage device or the energy storage system is used to provide electrical energy for the charging pile.

[0398] As Figure 2 shown, it includes a charging pile 4 and an energy storage device 1. The charging pile 4 is electrically connected to the energy storage device 1, and the energy storage device 1 is used to provide electrical energy for the charging pile 4. The charging pile 4 and the battery device in the energy storage device 1 are electrically connected through a cable, and the battery device can provide the electrical energy stored in itself to the charging pile 4. The charging pile 4 has one or more connectors 5, and the connectors 5 are used to connect to an electrical device (such as a vehicle), so as to replenish energy to the electrical device.

[0399] The energy storage device may be located inside the charging pile (such as an integrated charging and energy storage machine), or outside the charging pile.

[0400] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of this application, rather than to limit them; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered by the scope of the claims and the description of this application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. This application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, Includes energy unit and sampling assembly; The energy unit includes a pouch-shaped battery cell and a conductive shell, wherein a receiving space is formed in the shell, and the pouch-shaped battery cell is received in the receiving space; The pouch-shaped battery cell includes a first electrode lead-out portion and a second electrode lead-out portion with opposite polarities. The first electrode lead-out portion of at least one of the pouch-shaped battery cells is electrically connected to the housing, and the second electrode lead-out portion is insulated from the housing; The sampling assembly is electrically connected to the second electrode lead-out portion and the shell.

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

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 at two end surfaces of the pouch-shaped battery cell that are opposite to each other along a first direction. Along the first direction, the distance between the sampling component and the first electrode lead-out portion is greater than the distance between the sampling component and the second electrode lead-out portion.

4. The battery device according to claim 3, characterized in that, The energy unit includes a first electrode connecting portion and a second electrode connecting portion, the first electrode connecting portion is electrically connected to the first electrode lead-out portion, the second electrode connecting portion is electrically connected to the second electrode lead-out portion, along the first direction, the first electrode connecting portion and the second electrode connecting portion are respectively located at two ends of the shell, and the sampling component is located on one side of the pouch-shaped battery cell where the second electrode connecting 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 to 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, and the second direction intersects with the first direction. The shell also includes a first shell wall, which is opposite to the first opening along the second direction. The energy unit includes a first electrode connecting portion and a second electrode connecting portion respectively located at both ends of the first shell wall along the first direction. The energy unit includes a first bus rack and a second bus rack opposite to each other along the first direction. The first bus rack electrically connects the first electrode connecting portion and the first electrode lead-out portion, and the second bus rack electrically connects the second electrode connecting portion and the second electrode lead-out portion.

6. The battery device according to claim 5, wherein, The first electrode connecting portion is respectively connected to the first electrode lead-out portion and the shell, so that the first electrode lead-out portion is indirectly electrically connected to the shell through the first electrode connecting portion.

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

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

9. The battery device according to claim 5, characterized in that, The sampling component is located on the outer side of the first shell wall away from the accommodating space, and the sampling component is electrically connected to the second electrode connecting part and the shell respectively.

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

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

13. The battery device according to claim 10, characterized in that, The maximum voltage withstand value 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. The first busbar is electrically connected to the first electrode lead-out portion. The electrical connector connects the first busbar and the housing to serially connect the first busbar and the housing.

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 is electrically connected to the first electrode lead-out portion. The second electrode connection portion is electrically connected to the second electrode lead-out portion. The battery device further includes an insulating member that insulatively 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 electrically connects the first electrode connection portion and the first electrode lead-out portion. The second busbar electrically connects the second electrode connection portion and the second electrode lead-out portion. The battery device further includes an insulating member that insulatively connects the second busbar and the housing.

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

19. The battery device according to claim 16, wherein, The resistance of the insulating member is greater than or equal to 1MΩ.

20. The battery device according to claim 1, wherein, The battery device includes a plurality of energy units. Each energy unit includes a housing and a plurality of the bag-shaped battery monomers arranged side by side and accommodated in the housing. The first electrode lead-out portions of the plurality of bag-shaped battery monomers located in the same housing all face the same side and are connected to each other. Moreover, the second electrode lead-out portions of the plurality of bag-shaped battery monomers located in the same housing all face the same side and are connected to each other.

21. The battery device according to claim 20, wherein, An elastic member is provided between adjacent bag-shaped battery monomers located in the same energy unit. and / or Along the direction in which the plurality of bag-shaped battery monomers are arranged side by side, an elastic member is provided between the bag-shaped battery monomers and the inner wall of the housing.

22. The battery device according to claim 1, characterized in that, The battery device includes a plurality of energy units. The plurality of energy units are arranged in a group. An insulating layer is provided on the outer surface of the housing so that the housings of adjacent two energy units among the arranged plurality of energy units are insulated from each other.

23. The battery device according to claim 22, wherein, The energy unit includes a first electrode connection portion and a second electrode connection portion. The first electrode connection portion is electrically connected to the first electrode lead-out portion. The second electrode connection portion is electrically connected to the second electrode lead-out portion. The plurality of energy units are arranged in sequence. The relative positions of the electrode lead-out portions of the same-polarity electrodes of the bag-shaped battery monomers in the first electrode connections and the second electrode connection portions of adjacent two energy units face in opposite directions, and the adjacent energy units are serially connected.

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. The first electrode connection portion is electrically connected to the first electrode lead-out portion. The second electrode connection portion is electrically connected to the second electrode lead-out portion. The battery device includes a plurality of the energy units arranged in groups, and the battery device further includes a bus bar for connecting different ones of the energy units. The bus bar is connected to at least one of the first electrode lead-out portions, and the bus bar is connected to the housing of at least one of the energy units, so that the first electrode lead-out portion is indirectly electrically connected to the housing through the bus bar.

25. The battery device according to claim 24, wherein The plurality of energy units arranged in groups include first energy units and second energy units arranged alternately. The housing of the first energy unit is electrically connected to the bus bar, and the housing of the second energy unit is insulated from the bus bar.

26. The battery device according to claim 1, wherein The housing includes a first opening and two second openings opposed to each other in a first direction. The first opening is located on one side of the two second openings in a second direction and communicates with the two first openings. The second direction intersects the first direction. The battery device includes a box body, and the energy unit is located on the inner bottom wall of the box body. The housing includes two first end walls constituting the first opening, and the first end walls are arranged facing the inner bottom wall. Insulation layers are provided on the inner side wall surface, the outer side wall surface, and the transition wall surface connecting the inner side wall surface and the outer side wall surface of the first end wall.

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

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

29. The battery device according to claim 28, characterized in that, The sampling assembly and the pressure relief structure are arranged in a staggered manner on the first housing wall.

30. The battery device according to claim 28, wherein, The energy unit includes a first electrode connection portion and a second electrode connection portion. The housing has a connection portion for electrically connecting the sampling assembly. The sampling assembly is arranged between the connection portion and the second electrode connection portion, and the pressure relief structure is arranged between the connection portion and the first electrode connection portion.

31. The battery device according to claim 28, characterized in that, A protective member is provided outside the first housing wall, and the protective member is used to cover the first housing wall of at least one of the energy units.

32. The battery device according to claim 1, wherein, The battery device includes a box body, and the energy unit is located inside the box body. The housing and the box body are connected by a thermal conductive adhesive.

33. The battery device according to claim 32, characterized in that, The box body includes a box body main body and a heat exchange plate. The heat exchange plate is connected to the box body main body and jointly defines a receiving space with the box body main body. The energy unit is bonded to the heat exchange plate.

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

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

36. The battery device according to claim 35, characterized in that, The pouch battery cell is a ternary battery cell. The housing includes a first opening, and a plurality of the pouch battery cells are received in the housing. The housing further includes a first housing wall that is opposite to the first opening in a second direction, and the first housing wall is provided with a pressure relief structure.

37. The battery device according to claim 36, characterized in that, The pressure relief structure is configured as a pressure relief hole; alternatively, the pressure relief structure is configured as a notch; alternatively, the pressure relief structure is configured as a weakened portion.

38. An energy storage device, characterized in that, A battery device according to any one of claims 1-37, the battery device being configured to store or provide electrical energy.

39. A energy storage system, characterized in that, A power conversion device and an energy storage device according to claim 38, the power conversion device being configured to electrically connect a power generation device and the energy storage device.

40. An electrical device, characterized in that, The electrical device includes a battery device according to any one of claims 1-37, or the electrical device includes an energy storage device according to claim 38, or the electrical device includes an energy storage system according to claim 39, the battery device, the energy storage device, or the energy storage system being configured to store or provide electrical energy.

41. A charging network, characterized in that, A charging pile and an energy storage device according to claim 38 or an energy storage system according to claim 39, the energy storage device or the energy storage system being configured to provide electrical energy for the charging pile.

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