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

Abstract

The utility model relates to the field of batteries, and solves the problems that a bag-shaped single battery is easy to lose efficacy and high in safety risk. The utility model discloses a battery device, an energy storage device, an energy storage system, a power utilization device and a charging network. The battery device comprises a battery monomer unit, the battery monomer unit comprises a shell and a bag-shaped battery monomer, a containing cavity is formed in the shell, the bag-shaped battery monomer is arranged in the containing cavity, the shell comprises two first walls oppositely arranged in the first direction and a second wall located between the two first walls, and the second wall is arranged between the two first walls. The second wall is located at one end of the shell in the second direction and connected to the two first walls, a first opening is formed in the other end of the shell in the second direction, and the second direction is perpendicular to the first direction; the plurality of battery monomer units are arranged along the first direction to form a unit group, the limiting parts are positioned on one side, deviating from the first opening, of the first walls of at least part of the battery monomer units in the unit group, and the limiting parts are used for providing constraining force along the first direction for the battery monomer units.

Description

Technical Field

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

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

[0003] In the related art, a battery device may include a plurality of soft-pack batteries. A soft-pack battery is a battery encapsulated in a soft shell, usually using an aluminum-plastic film as the shell material, and has the characteristics of being lightweight, thin, and having a high energy density. However, for soft-pack batteries, the gas generated during the charging and discharging process is prone to expansion, causing battery failure and safety hazards. Utility Model Content

[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 alleviate the safety hazard caused by damage and leakage of the plastic sealing position of the output tab of the bag-shaped battery cell.

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

[0006] A battery monomer unit, the battery monomer unit comprising a shell and a pouch-shaped battery monomer, the shell having a receiving cavity, the pouch-shaped battery monomer being arranged in the receiving cavity, the shell comprising two first walls arranged opposite to each other along a first direction, and a second wall located between the two first walls, the second wall being located at one end of the shell along a second direction and connected to the two first walls, the other end of the shell along the second direction forming a first opening, the second direction being perpendicular to the first direction;

[0007] A limiting member, wherein a plurality of the battery monomer units are arranged along a first direction to form a unit group, the limiting member is located on a side of the second wall of at least some of the battery monomer units in the unit group that is away from the first opening, and the limiting member is used to provide a restraining force along the first direction to the battery monomer units.

[0008] In the above embodiment, the limiting member is used to provide a restraining force along the first direction to the battery monomer unit, which can reduce or avoid the displacement of the battery monomer unit in the first direction to a certain extent, thereby reducing the failure and safety risks of the pouch-shaped battery monomer.

[0009] In some embodiments, the battery device further includes a first structural member and a second structural member, the first structural member and the second structural member are respectively located at two ends of the unit group along the first direction, and the limiting member is connected to the first structural member and the second structural member.

[0010] In the above embodiment, the first structural member and the second structural member are respectively located at the two ends of the unit group along the first direction, and the limiter connects the first structural member and the second structural member. The limiter can limit the relative position between the first structural member and the second structural member in the first direction, thereby limiting the relative position between multiple battery cells of the unit group in the first direction, thereby reducing the displacement of the battery cell in the first direction to a certain extent, thereby reducing the failure and safety risks of the pouch-shaped battery cells.

[0011] In some embodiments, the first structural member and the second structural member are respectively a first beam and a second beam disposed at two ends of the unit group along the first direction.

[0012] In the above embodiment, the first structural member and the second structural member are respectively the first beam and the second beam on the two ends of the unit group along the first direction, and the limiter can connect the first beam and the second beam. The limiter can limit the relative position between the first beam and the second beam in the first direction, thereby limiting the relative position between the multiple battery cells of the unit group in the first direction, thereby reducing or avoiding the displacement of the battery cell in the first direction to a certain extent, thereby reducing the failure and safety risks of the pouch-shaped battery cells.

[0013] In some embodiments, the stopper is connected to the second wall of at least a portion of the battery cells in the cell group.

[0014] In the above embodiment, the limit member connects the second wall of at least part of the battery single units in the unit group, so as to limit the relative position between at least part of the shell in the first direction, and further limit the relative position between the connected battery single units in the first direction, so as to reduce or avoid the displacement of the battery single units in the first direction to a certain extent, thereby reducing the failure and safety risks of the pouch-shaped battery single units.

[0015] In some embodiments, the limiting member is connected to at least a portion of the battery monomer unit by adhesive.

[0016] In the above embodiment, the limiting member is connected to at least part of the battery monomer units by adhesive, which can reduce the displacement of the battery monomer units in the first direction to a certain extent and simplify the installation process of the battery device.

[0017] In some embodiments, the shell of the battery cell unit is provided with an adhesive area, the limiter is connected to the battery cell unit by adhesive in the adhesive area, the shell of the battery cell unit is provided with an insulating layer, and a window is opened on the insulating layer in the adhesive area to allow the colloid to connect the limiter and the shell of the battery cell unit through the window.

[0018] In the above embodiment, the insulating layer has a window in the adhesive area so that the colloid can connect the limiter and the shell of the battery cell unit through the window. The provision of the insulating layer can reduce the risk of abnormal conductivity of the shell of the battery cell unit. In addition, the opening of the window in the adhesive area of ​​the insulating layer can make the connection between the shell and the limiter more stable, and the insulating layer is not easily torn due to the relative position of the limiter and the shell during vibration.

[0019] In some embodiments, the limiting member is connected to at least a portion of the battery monomer units using insulating glue.

[0020] In the above embodiment, the limiter is connected to at least part of the battery cells by using insulating glue, which can reduce the displacement of the battery cells in the first direction to a certain extent, and can reduce the risk of abnormal conductivity between different battery cells and between the battery cells and other metal parts in the battery.

[0021] In some embodiments, one of the battery cell units includes a plurality of the pouch-shaped battery cells accommodated in the housing.

[0022] In the above embodiment, one battery cell unit includes a plurality of pouch-shaped battery cells accommodated in a housing, which can improve the energy density of the battery device and the overall performance of the battery device.

[0023] In some embodiments, the battery device further includes a box body, the box body includes an inner bottom wall, and the end of the first wall of the battery monomer unit facing away from the second wall has a first connecting portion, and the first connecting portion is connected to the inner bottom wall.

[0024] In the above embodiment, the first wall of the battery cell unit has a first connecting portion at one end away from the second wall, and the first connecting portion is connected to the inner bottom wall, which can further reduce or avoid the displacement of the battery cell unit in the box, thereby reducing the failure and safety risks of the pouch-shaped battery cell.

[0025] In some embodiments, the first connecting portion is connected to the inner bottom wall by gluing.

[0026] In the above embodiment, the first connection portion is connected to the inner bottom wall by gluing, which can reduce or avoid displacement of the battery monomer unit in the box to a certain extent and simplify the installation process of the battery monomer unit.

[0027] In some embodiments, the first connecting portion is connected to the inner bottom wall by insulating glue.

[0028] In the above embodiment, the first connecting portion is connected to the inner bottom wall by insulating glue, which can reduce or avoid the displacement of the battery monomer unit in the box to a certain extent, and can reduce the risk of abnormal conductivity between the shell of the battery monomer unit and the bottom wall of the box.

[0029] In some embodiments, the box body includes a heat exchange plate, the inner bottom wall is a side surface of the heat exchange plate facing the battery monomer unit, and the first connecting portion is connected to the inner bottom wall by a heat conductive adhesive.

[0030] In the above embodiments, the heat exchange plate can quickly remove the heat generated by the pouch-shaped battery cells or provide heat for the pouch-shaped battery cells, so that the pouch-shaped battery cells operate within a suitable temperature range, which helps to improve the performance of the battery device and reduce the risk of thermal runaway.

[0031] In some embodiments, the inner bottom wall includes a second connecting portion, and the first connecting portion is snap-fitted with the second connecting portion.

[0032] In the above embodiment, the inner bottom wall includes a second connecting portion, and the first connecting portion and the second connecting portion are snap-fitted together to connect the battery cell unit to the inner bottom wall of the box body, which can further reduce or avoid the displacement of the battery cell unit in the box body, thereby reducing the failure and safety risks of the bag-shaped battery cells.

[0033] In some embodiments, the battery cell unit further includes a positive lead-out portion and a negative lead-out portion located on the second wall, and projected toward the second wall along the second direction, the projection of the limiting member is completely misaligned with the projection of the positive lead-out portion and the projection of the negative lead-out portion.

[0034] In the above embodiment, the positive lead-out portion and the negative lead-out portion are both located on the second wall, and are completely misaligned with the projection of the limiting member onto the second wall along the second direction, so that the three can share at least part of the space along the second direction outside the second wall, making the battery arrangement more regular and compact; and, when projected onto the second wall along the second direction, the projection of the limiting member is completely misaligned with the projection of the positive lead-out portion and the projection of the negative lead-out portion, and physical contact or interference between the limiting member and the positive lead-out portion or the negative lead-out portion can be avoided, thereby effectively improving the stability of the battery device.

[0035] In some embodiments, the positive electrode connection portion and the negative electrode connection portion of the pouch-shaped battery cell are respectively located at two ends of the pouch-shaped battery cell along a third direction, and the third direction and the first direction and the second direction are perpendicular to each other.

[0036] The battery cell unit further includes a positive busbar and a negative busbar. The positive busbar is connected to the positive connection portion and the positive lead-out portion, and the negative busbar is connected to the negative connection portion and the negative lead-out portion.

[0037] In the above embodiments, the positive electrode connection part and the negative electrode connection part of the pouch-shaped battery cell can be arranged at the two ends of the pouch-shaped battery cell along the third direction, and the positive electrode busbar and the negative electrode busbar are used to lead out and connect the two to the positive electrode connection part and the negative electrode connection part on the second wall of the battery cell unit, which is beneficial to optimize the internal space utilization of the battery cell unit and improve the energy density of the battery cell unit.

[0038] In some embodiments, the battery cell unit includes two end surfaces along a third direction, and the third direction is perpendicular to the first direction and the second direction in pairs.

[0039] The battery cell unit includes a positive electrode lead-out portion and a negative electrode lead-out portion, and the positive electrode lead-out portion and the negative electrode lead-out portion are respectively located at two end surfaces of the battery cell unit along the third direction.

[0040] In the above embodiments, the positive lead-out portion and the negative lead-out portion are respectively located at two end surfaces of the battery monomer unit along the third direction, the distance between the positive lead-out portion and the positive electrode connecting portion, and the distance between the negative lead-out portion and the negative electrode connecting portion are relatively short, and the transition structure between the positive lead-out portion and the positive electrode connecting portion, and the transition structure between the negative lead-out portion and the negative electrode connecting portion can be simpler.

[0041] In some embodiments, the shell is further provided with a pressure relief structure, and the pressure relief structure is located on the second wall. When projected toward the second wall along the second direction, the projection of the limiting member is completely misaligned with the projection of the pressure relief structure.

[0042] In the above embodiment, when projected toward the second wall along the second direction, the projection of the limiter and the projection of the pressure relief structure are completely misaligned, which can avoid physical contact or interference between the limiter and the pressure relief structure and can also reduce the probability of damage to the limiter structure when the pressure relief structure is actuated to release pressure, thereby effectively improving the stability of the battery device.

[0043] In some embodiments, the battery device includes a box body, an upper cover and a compressible member, the upper cover is covered on the box body, and the compressible member is respectively abutted against the limiting member and the upper cover, so that the upper cover is pressed against the battery monomer unit through the compressible member.

[0044] In the above embodiment, the compressible member abuts against the limit member and the upper cover respectively, so that the upper cover is pressed against the battery cell unit through the compressible member, so that the battery cell unit remains stable when subjected to external force along the second direction, thereby reducing the displacement of the battery cell unit in the second direction to a certain extent.

[0045] In some embodiments, the limiting member is made of metal, the shell is made of metal, and the limiting member is welded to the shell of the battery cell.

[0046] In the above embodiment, the limiter is welded to the housing of the battery cell, so that the limiter can provide greater restraint force for at least part of the battery cell, further reducing the displacement of the battery cell in the first direction, thereby reducing the failure and safety risks of the pouch-shaped battery cell. Moreover, the welding cost is low, the process is fast, and it is easy to implement.

[0047] In a second aspect, the present application provides an energy storage device, which includes a plurality of battery devices in any of the above embodiments, and the battery devices are used to store or provide electrical energy.

[0048] 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 embodiment, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

[0049] In a fourth aspect, the present application provides an electrical device, which includes the battery device, energy storage device or energy storage system in the above-mentioned embodiments, and the battery device is used to store or provide electrical energy.

[0050] In a fifth aspect, the present application provides a charging network, which includes a charging pile and an energy storage device or an energy storage system in the above embodiment, wherein the energy storage device is used to provide electrical energy to the charging pile.

[0051] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0053] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0054] Figure 2 An exploded schematic diagram of a battery device according to some embodiments of the present application;

[0055] Figure 3 It is an exploded schematic diagram of a unit group of some embodiments of the present application;

[0056] Figure 4 A top view of a unit group according to some embodiments of the present application;

[0057] Figure 5 A side view of a unit group according to some embodiments of the present application;

[0058] Figure 6 This is a schematic diagram of the structure of a pouch-shaped battery cell according to some embodiments of the present application;

[0059] Figure 7 A schematic diagram of a module of an energy storage system according to some embodiments of the present application;

[0060] Figure 8 This is a module diagram of a charging network according to some embodiments of the present application.

[0061] The reference numerals in the specific implementation manner are as follows:

[0062] Vehicle 1000, energy storage system 2000, charging network 3000, energy storage device 1, power conversion equipment 2, power generation equipment 3, charging pile 4, connector 5;

[0063] Battery device 100, controller 200, motor 300;

[0064] Box body 10, upper cover 11, inner bottom wall 12, heat exchange plate 13;

[0065] Pouch-shaped battery cell 20, positive electrode connection portion 21, negative electrode connection portion 22;

[0066] Unit group 30, battery monomer unit 31, stopper 32, compressible member 33, shell 34, positive electrode lead-out portion 311, negative electrode lead-out portion 312, positive electrode bus frame 313, negative electrode bus frame 314, accommodating chamber 341, first wall 342, second wall 343, first opening 344, adhesive area 345, insulating layer 346, first connecting portion 347, pressure relief structure 348;

[0067] A first structural member 40 and a second structural member 50 . DETAILED DESCRIPTION

[0068] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0070] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0071] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0072] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0073] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0074] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0075] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. 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 the specific circumstances.

[0076] If not otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0077] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0078] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0079] In electric vehicle applications, pouch-shaped battery cells have the advantages of light weight and high density compared to traditional hard-shell battery cells. However, during the long-term cycle of pouch-shaped battery cells, due to the gas generated during the charge and discharge process, the pouch-shaped battery cells will expand, resulting in the migration of active materials. As the migration accumulates, the electrode connection of the pouch-shaped battery cells is prone to break at the connection position, resulting in battery failure. At the same time, the pouch-shaped battery cells are prone to short circuits with adjacent pouch-shaped battery cells connected to the busbar, causing safety risks.

[0080] Specifically, the expansion process of the pouch-shaped battery cell can be limited by a shell having a certain strength and rigidity, thereby alleviating the failure and safety issues of the pouch-shaped battery cell caused by the migration of the active material position. The battery device may include a plurality of battery cell units. A battery cell unit includes a shell and at least one pouch-shaped battery cell, and the at least one pouch-shaped battery cell is accommodated in the accommodation cavity of the shell.

[0081] The battery cell will be displaced as the pouch-shaped battery cell expands. As the displacement accumulates, the electrode lead-out portion of the battery cell is prone to break from the connection position, resulting in battery failure. In addition, the battery cell is prone to short-circuit with the adjacent battery cell connected to the busbar, causing safety risks.

[0082] Based on the above considerations, please combine Figure 3 In order to alleviate the problems caused by the expansion of the pouch-shaped battery cells 20, the present application provides a limiter 32, which can fix the relative positions between multiple shells 34 to provide a restraining force to the multiple battery cells 31, thereby limiting the expansion process of the pouch-shaped battery cells 20 accommodated in the shells 34, and further reducing the failure of the pouch-shaped battery cells 20 and reducing safety risks to a certain extent.

[0083] It should be noted that since the shell 34 has a certain strength and rigidity, the relative positions of multiple shells 34 are fixed by the limiter 32 to provide a restraining force to the multiple battery cells 31, which can effectively limit the expansion process of the pouch-shaped battery cells 20 while reducing the risk of deformation due to the restraining force to a certain extent.

[0084] The battery device 100 (Battery Apparatus) of the present application may include one or more cell groups 30 for providing voltage and capacity. The cell group may include multiple battery monomer units 31, and the battery monomer unit 31 may include a housing 34 and at least one pouch-shaped battery monomer 20. The multiple pouch-shaped battery monomers 20 may be connected in series, in parallel, or in mixed connection through a busbar component. Mixed connection means that multiple pouch-shaped battery monomers 20 are connected in series or in parallel.

[0085] In some embodiments, the unit group 30 is generally formed by arranging a plurality of battery single units 31 .

[0086] As an example, the unit group 30 may be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery monomer units 31 to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery monomer units 31 by a cable tie.

[0087] In some embodiments, the battery device 100 may be a battery pack, which includes a box body 10 , an upper cover 11 , and one or more cell groups 30 . The cell group 30 is accommodated in the box body 10 , and the upper cover 11 covers the box body 10 .

[0088] As an example, the unit group 30 may be a battery module. The unit group 30 may be accommodated in the box body 10 by fixing the battery module in the box body 10 , and the upper cover 11 may cover the box body 10 .

[0089] As an example, the unit group 30 may also be accommodated in the box body 10 by directly fixing the plurality of battery monomer units 31 to the box body 10 , and the upper cover 11 may cover the box body 10 .

[0090] As an example, combine Figure 2The upper cover 11 and the box body 10 are buckled together to form a closed space inside the box body 10 to accommodate the unit group 30. The closed here means covering or closing, which can be sealed or unsealed.

[0091] As an example, the box body 10 may include a frame and a bottom plate. The bottom plate is connected to the frame, and the upper cover 11 covers the box body 10, so that a closed space is formed inside the box body 10 to accommodate the unit group 30.

[0092] In some embodiments, the box 10 can be used as a part of the chassis structure of the vehicle 1000. For example, part of the box 10 can become at least a part of the floor of the vehicle 1000, or part of the box 10 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0093] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using the battery device 100, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles 1000, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0094] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in one embodiment of the present application.

[0095] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0096] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0097] In the battery device 100, there may be one or more cell groups 30, in one cell group 30, there may be one or more shells 34, in one shell 34, there may be one or more pouch-shaped battery cells 20, and multiple pouch-shaped battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple pouch-shaped battery cells 20 are both connected in series and in parallel. Multiple pouch-shaped battery cells 20 may be directly connected in series, in parallel, or in mixed connection, and the whole body formed by multiple pouch-shaped battery cells 20 may be accommodated in the shell 34; multiple pouch-shaped battery cells 20 in multiple shells 34 may be connected in series, in parallel, or in mixed connection to form a whole body; multiple cell groups 30 may be connected in series, in parallel, or in mixed connection to form a whole body, and accommodated in the box 10, and the upper cover 11 covers the box 10. The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar component for realizing electrical connection between multiple pouch-shaped battery cells 20.

[0098] In the embodiment of the present application, the pouch-shaped battery cell 20 may be a secondary battery. A secondary battery refers to a battery that can be continuously used by activating active materials by charging after the pouch-shaped battery cell 20 is discharged.

[0099] The pouch-shaped battery cell 20 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0100] According to some embodiments of the present application, referring to Figure 2 and Figure 3 , the embodiment of the present application provides a battery device 100. The battery device 100 includes a battery monomer unit 31 and a stopper 32. The battery monomer unit 31 includes a shell 34 and a pouch-shaped battery monomer 20. A housing cavity 341 is provided in the shell 34, and the pouch-shaped battery monomer 20 is provided in the housing cavity 341. The shell 34 includes two first walls 342 arranged opposite to each other along a first direction F1, and a second wall 343 located between the two first walls 342, and the second wall 343 is located at one end of the shell 34 along a second direction F2 and connected to the two first walls 342. A first opening 344 is formed at the other end of the shell 34 along the second direction F2. The second direction F2 is perpendicular to the first direction F1. A plurality of battery monomer units 31 are arranged along the first direction F1 to form a unit group 30. The stopper 32 is located on the side of the second wall 343 of at least part of the battery monomer units 31 in the unit group 30 away from the first opening 344, and the stopper 32 is used to provide a restraining force along the first direction to the battery monomer unit 31.

[0101] Optionally, in one embodiment, the second wall 343 may be connected to the two first walls 342 by welding or a snap-fit ​​structure. Optionally, in one embodiment, the second wall 343 and the two first walls 342 may be an integrally formed structure.

[0102] The pouch-shaped battery cell 20 may be received in the receiving cavity 341 of the housing 34 through the first opening 344 of the housing 34 to form a battery cell unit 31 .

[0103] Optionally, the battery device 100 may include one cell group 30 or a plurality of cell groups 30. Optionally, when the battery device 100 includes a plurality of cell groups 30, the plurality of cell groups 30 may be arranged along the first direction. The third direction is perpendicular to the first direction and the second direction.

[0104] The stopper 32 can limit the relative position between the multiple shells 34 to provide a restraining force along the first direction F1 to the battery cells 31. When the pouch-shaped battery cells 20 expand, the multiple battery cells 31 can be tightened by the stopper 32 to limit the mutual displacement of the multiple battery cells 31.

[0105] Optionally, the battery device 100 may include one cell group 30 and one stopper 32. For example, in some embodiments, one cell group 30 includes a plurality of battery cells 31 arranged along a first direction F1, and the stopper 32 is located on a side of the second wall 343 of all the battery cells 31 away from the first opening 344, and provides a restraining force along the first direction F1 for all the battery cells 31.

[0106] Optionally, the battery device 100 may include a plurality of cell groups 30 and a stopper 32. For example, in some embodiments, the battery device 100 may include two cell groups 30 arranged along the first direction F1 and a stopper 32, and the stopper 32 may be located on a side of the second wall 343 of all the battery cells 31 of the two cell groups 30 that is away from the first opening 344, and provide a restraining force along the first direction F1 for all the battery cells 31 in the two cell groups 30.

[0107] Optionally, the battery device may include one cell group 30 and a plurality of stoppers 32. For example, in some embodiments, the battery device 100 may include one cell group 30 and a plurality of stoppers 32, and the plurality of stoppers 32 may be located together on a side of the second wall 343 of at least some of the battery cells 31 of one cell group 30 that is away from the first opening 344, and provide a restraining force along the first direction F1 for at least some of the battery cells 31 in the cell group 30.

[0108] Optionally, the battery device 100 may include a plurality of cell groups 30 and a plurality of stoppers 32. For example, in some embodiments, the battery device 100 may include two cell groups 30 and two stoppers 32, each cell group 30 may include a plurality of battery cells 31 arranged along the first direction F1, each cell group 30 may be configured with one stopper 32, the stopper 32 is located on the side of the second wall 343 of all battery cells 31 in one cell group 30 away from the first opening 344, and provides a restraining force along the first direction F1 for all battery cells 31. For another example, in some embodiments, the battery device 100 may include three cell groups 30 and six stoppers 32, each cell group 30 may be configured with two stoppers 32, and the two stoppers 32 may be simultaneously located on the side of the second wall 343 of all battery cells 31 in the same cell group 30 away from the first opening 344. For another example, in some embodiments, the battery device 100 may include three unit groups 30 and six limit members 32, each unit group 30 may be configured with two limit members 32, the two limit members 32 may be located on the side of the second wall 343 of some battery single units 31 in the same unit group 30 that is away from the second opening 344, and provide a restraining force along the first direction F1 for some battery single units 31.

[0109] The limiting member 32 is used to provide a restraining force along the first direction F1 to the battery cell unit 31 , which can reduce the risk of displacement of the battery cell unit 31 in the first direction F1 to a certain extent, thereby reducing the failure and safety risks of the pouch-shaped battery cell 20 .

[0110] According to some embodiments of the present application, optionally, please combine Figure 3 The battery device 100 further includes a first structural member 40 and a second structural member 50 , which are respectively located at two ends of the unit group 30 along the first direction F1 , and the limiting member 32 connects the first structural member 40 and the second structural member 50 .

[0111] The cell group 30 includes a plurality of battery monomer units 31 arranged along a first direction F1 and closely abutting each other. The battery monomer units 31 at both ends of the cell group 30 along the first direction F1 are respectively a first battery monomer unit and a second battery monomer unit. The first structural member 40 and the second structural member 50 are respectively located at both ends of the cell group 30 along the first direction F1. The first structural member 40 and the second structural member 50 are respectively connected to or closely abutting against the first battery monomer unit and the second battery monomer unit.

[0112] In some embodiments, the first structural member 40 is located on the side of the first battery monomer unit away from the second battery monomer unit along the first direction F1, and the second structural member 50 is located on the side of the second battery monomer unit away from the first battery monomer unit along the first direction F1. The first structural member 40 and the second structural member 50 are respectively connected to or closely abutted with the first battery monomer unit and the second battery monomer unit, that is, the first structural member 40 and the second structural member 50 are respectively connected to or closely abutted with the first wall 342 of the first battery monomer unit and the second battery monomer unit. The limiter 32 connects the first structural member 40 and the second structural member 50. The limiter 32 can limit the relative position between the first structural member 40 and the second structural member 50 in the first direction F1, thereby limiting the relative position between the first battery monomer unit and the second battery monomer unit in the first direction F1. Since the unit group 30 includes a plurality of battery monomer units 31 arranged and closely abutted along the first direction F1, at least one battery monomer unit 31 is sandwiched between the first battery monomer unit and the second battery monomer unit.

[0113] It can be understood that when the limiting member 32 limits the relative position between the first battery cell unit and the second battery cell unit in the first direction F1 , the limiting member 32 also limits the relative position between all the battery cells 31 of the unit group 30 in the first direction F1 .

[0114] The first structural member 40 and the second structural member 50 are respectively located at the two ends of the unit group 30 along the first direction F1, and the limit member 32 connects the first structural member 40 and the second structural member 50. The limit member 32 can limit the relative position between the first structural member 40 and the second structural member 50 in the first direction F1, thereby limiting the relative position between the multiple battery cells 31 of the unit group 30 in the first direction F1, thereby improving the displacement capability of the battery cell 31 in the first direction F1 to a certain extent, thereby reducing the failure and safety risks of the pouch-shaped battery cells 20.

[0115] According to some embodiments of the present application, optionally, please combine Figure 3 The first structure member 40 and the second structure member 50 are respectively a first beam and a second beam provided at both ends of the unit group 30 along the first direction F1.

[0116] The first beam and the second beam are a kind of long strip-shaped load-bearing member. Optionally, the length direction of the first beam and the second beam is along the third direction F3, the first beam is the same as the second beam in length, and the size of the first beam along the third direction F3 is the same as the shell 34, so that the first beam can be better connected to the shell 34 and the shell 34 can be limited. The first beam and the second beam are respectively arranged at the two ends of the unit group 30 along the first direction F1. The third direction F3 is perpendicular to the first direction F1 and the second direction F2.

[0117] The first structural member 40 and the second structural member 50 are respectively the first beam and the second beam on both ends of the unit group 30 along the first direction F1. The first beam and the second beam can form a longer contact area with the unit group 30, thereby improving the restraining ability of the multiple battery cells 31 to a certain extent.

[0118] In some embodiments, the first beam is located on a side of the first battery cell unit away from the second battery cell unit along the first direction F1, and the second beam is located on a side of the second battery cell unit away from the first battery cell unit along the first direction F1. The first beam and the second beam are connected to or closely abut the first battery cell unit and the second battery cell unit, respectively. The limiter 32 connects the first beam and the second beam. The limiter 32 can limit the relative position between the first beam and the second beam in the first direction F1, thereby limiting the relative position between the first battery cell unit and the second battery cell unit in the first direction F1. Since the unit group 30 includes a plurality of battery cells 31 arranged and closely abutted along the first direction F1, the battery cell 31 between the first battery cell unit and the second battery cell unit is clamped between the first battery cell unit and the second battery cell unit.

[0119] It can be understood that when the limiting member 32 limits the relative position between the first battery cell unit and the second battery cell unit in the first direction F1 , the limiting member 32 also limits the relative position between all the battery cells 31 of the unit group 30 in the first direction F1 .

[0120] In some embodiments, the first beam is located on a side of the first battery cell unit away from the first opening 344 along the second direction F2, and the second beam is located on a side of the second battery cell unit away from the first opening 344 along the second direction F2. The first beam and the second beam are connected to the first battery cell unit and the second battery cell unit, respectively. The limiter 32 connects the first beam and the second beam. The limiter 32 can limit the relative position between the first beam and the second beam in the first direction F1, thereby limiting the relative position between the first battery cell unit and the second battery cell unit in the first direction F1. Since the unit group 30 includes a plurality of battery cells 31 arranged and closely abutted along the first direction F1, the battery cell 31 between the first battery cell unit and the second battery cell unit is clamped between a battery cell unit 31 and a second battery cell unit.

[0121] It can be understood that when the limiting member 32 limits the relative position between the first battery single unit and the second battery single unit in the first direction F1 , the limiting member 32 also limits the relative position between all the battery single units 31 of the unit group 30 in the first direction F1 .

[0122] The first structural member 40 and the second structural member 50 are respectively the first beam and the second beam on the two ends of the unit group 30 along the first direction F1. The limiter 32 can connect the first beam and the second beam. The limiter 32 can limit the relative position between the first beam and the second beam in the first direction F1, thereby limiting the relative position between the multiple battery cells 31 of the unit group 30 in the first direction F1, thereby reducing or avoiding the displacement of the battery cell 31 in the first direction F1 to a certain extent, thereby reducing the failure and safety risks of the pouch-shaped battery cells 20.

[0123] According to some embodiments of the present application, optionally, please combine Figure 4 The limiting member 32 is connected to the second wall 343 of at least part of the battery monomer units 31 in the unit group 30 .

[0124] The limiting member 32 is connected to the second wall 343 of at least some of the battery cells 31 in the unit group 30 , that is, by limiting the relative position of at least some of the shells 34 in the first direction F1 , the relative position of at least some of the battery cells 31 in the first direction F1 is limited.

[0125] Optionally, in some embodiments, one stopper 32 may be connected to the second wall 343 of the housing 34 of all the battery monomer units 31 in the unit group 30. In some embodiments, a plurality of stoppers 32 are respectively connected to the second wall 343 of the housing 34 of all the battery monomer units 31 in the unit group 30. Optionally, the surface of the stopper 32 facing the battery monomer unit 31 along the second direction F2 is connected to the surface of the second wall 343 of the housing 34 away from the first wall 342. Optionally, a plurality of connecting portions may be convexly provided on the surface of the stopper 32 facing the battery monomer unit 31 along the second direction F2. The plurality of connecting portions may respectively connect the surfaces of the second walls 343 of the plurality of battery monomer units 31 away from the first wall 342.

[0126] The stopper 32 may connect some of the adjacent battery monomer units 31 in the unit group 30. In some embodiments, one stopper 32 is respectively connected to the second wall 343 of the housing 34 of two or more adjacent battery monomer units 31 in the unit group 30. Optionally, the surface of the stopper 32 facing the battery monomer unit 31 along the second direction F2 is connected to the surface of the second wall 343 of the housing 34 away from the first wall 342. Optionally, a plurality of connecting portions may be convexly provided on the surface of the stopper 32 facing the battery monomer unit 31 along the second direction F2. The plurality of connecting portions may respectively connect the surfaces of the second walls 343 of the plurality of battery monomer units 31 away from the first wall 342.

[0127] The stopper 32 may connect some of the non-adjacent battery cells 31 in the unit group 30. In some embodiments, the unit group 30 includes a plurality of battery cells 31 arranged along the first direction F1 and closely abutted. One stopper 32 is respectively connected to the second wall 343 of the shell 34 of some of the non-adjacent battery cells 31 in the unit group 30. Optionally, the surface of the stopper 32 facing the battery cell 31 along the second direction F2 is connected to the surface of the second wall 343 of the shell 34 away from the first wall 342. Optionally, a plurality of connecting portions may be convexly provided on the surface of the stopper 32 facing the battery cell 31 along the second direction F2. The plurality of connecting portions may respectively connect the surfaces of the second walls 343 of the plurality of battery cells 31 away from the first wall 342.

[0128] The limit member 32 connects the second wall 343 of at least part of the battery cell units 31 in the unit group 30, thereby limiting the relative position between at least part of the shell 34 in the first direction F1, and further limiting the relative position between the connected battery cell units 31 in the first direction F1, thereby reducing or avoiding the displacement of the battery cell units 31 in the first direction F1 to a certain extent, thereby reducing the failure and safety risks of the pouch-shaped battery cells 20.

[0129] According to some embodiments of the present application, optionally, please combine Figure 4 The limiting member 32 is connected to at least part of the battery monomer unit 31 by adhesive.

[0130] The limiting member 32 is connected to at least a portion of the battery monomer units 31 by adhesive, that is, the limiting member 32 is connected to at least a portion of the battery monomer units 31 by adhesive connection.

[0131] In some embodiments, adhesive is coated between the portion of the limit member 32 connected to the surface of the battery cell unit 31 along the second direction F2 and the surface of the second wall 343 of the shell 34 away from the first wall 342. The adhesive can fix the limit member 32 to at least part of the battery cell unit 31, thereby constraining the displacement of the battery cell unit 31 in the first direction F1.

[0132] In some embodiments, the stopper 32 is provided with a plurality of connection parts, which are protrudingly provided on the surface of the stopper 32 along the second direction F2 toward the battery monomer unit 31. An adhesive is applied between the connection parts and the portion connected to the surface of the second wall 343 of the battery monomer unit 31 away from the first wall 342, and the adhesive can fix the stopper 32 and the battery monomer unit 31, thereby constraining the displacement of the battery monomer unit 31 in the first direction F1.

[0133] Optionally, in one embodiment, the stopper 32 and the adhesive are insulated.

[0134] The limiting member 32 is connected to at least a portion of the battery monomer unit 31 by adhesive, which can reduce the displacement of the battery monomer unit 31 in the first direction F1 to a certain extent and simplify the installation process of the battery device 100 .

[0135] According to some embodiments of the present application, optionally, please combine Figure 4 and Figure 5 The shell 34 of the battery cell unit 31 is provided with an adhesive area 345, and the limiting member 32 is connected to the battery cell unit 31 by adhesive in the adhesive area 345. An insulating layer 346 is provided on the shell 34 of the battery cell unit 31, and the insulating layer 346 has a window in the adhesive area 345 so that the colloid can connect the limiting member 32 and the shell 34 of the battery cell unit 31 through the window.

[0136] The insulating layer 346 refers to a material layer used to prevent current from being conducted between conductors or conductive materials. The insulating layer 346 is disposed on the housing 34 of the battery cell 31. When the insulating layer 346 is disposed on the outside of the housing 34, the risk of abnormal conduction between adjacent battery cells 31 and between the battery cell 31 and other metal parts can be reduced.

[0137] The insulating layer 346 has a window in the adhesive region 345, and the colloid can pass through the window to bond the stopper 32 and the battery cell shell 34. The window region of the insulating layer 346 corresponds to the adhesive region 345, and the insulating layer 346 can reduce the risk of abnormal conductivity of the shell 34 of the battery cell 31. In addition, the insulating layer 346 has a window in the adhesive region 345, which can make the connection between the shell 34 and the stopper 32 more stable, and the insulating layer 346 is not easily torn due to the relative position of the stopper 32 and the shell 34 during vibration.

[0138] Optionally, the insulating layer 346 may refer to a material layer formed by an insulating material (such as insulating paint, resin or coating) coated on the outer surface of the shell 34 .

[0139] Optionally, the insulating layer 346 may be a material with an insulating function (such as a rubber gasket, an insulating film or an insulating plate) directly attached to the outer surface of the shell 34 .

[0140] The insulating layer 346 has windows in the adhesive region 345 so that the colloid can pass through the windows to connect the stopper 32 and the shell 34 of the battery cell 31 , which is beneficial to control the coating range of the colloid and prevent the colloid from diffusing outside the adhesive region 345 to a certain extent.

[0141] According to some embodiments of the present application, optionally, please combine Figure 3 The limiting member 32 is connected to at least part of the battery monomer unit 31 by using insulating glue.

[0142] Insulation glue has both insulating properties and adhesiveness.

[0143] In some embodiments, the housing 34 of at least one battery cell 31 is provided with an adhesive region 345 and an insulating layer 346. The stopper 32 is connected to at least one battery cell 31 by insulating adhesive, and the stopper 32 is connected to the adhesive region 345 and the insulating layer of the battery cell 31 provided on at least one housing 34 by adhesive.

[0144] The limiter 32 is connected to at least part of the battery cells 31 with insulating glue, which can reduce the displacement of the battery cells 31 in the first direction F1 to a certain extent, and can reduce the risk of abnormal conductivity between different battery cells 31 and between the battery cells 31 and other metal parts in the battery.

[0145] According to some embodiments of the present application, optionally, please combine Figures 2 to 6 , one battery cell unit 31 includes a plurality of pouch-shaped battery cells 20 accommodated in a housing 34 .

[0146] In some embodiments, a plurality of pouch-shaped battery cells 20 may be directly accommodated in the housing 34 in a closely abutting arrangement.

[0147] In some embodiments, a buffer layer may be provided between the shell 34 and the pouch-shaped battery cells 20 , and / or between the pouch-shaped battery cells 20 , and the buffer layer may absorb external shock or vibration, thereby protecting the pouch-shaped battery cells 20 and further improving the durability and reliability of the battery device 100 .

[0148] When the multiple pouch-shaped battery cells 20 accommodated in the housing 34 expand, the housing 34 can provide a certain degree of restriction on the expansion amplitude of the pouch-shaped battery cells 20, and the stopper 32 can restrict the displacement of the battery cell unit 31 caused by the expansion of the pouch-shaped battery cells 20. The multiple pouch-shaped battery cells 20 accommodated in the housing 34 can be electrically connected in series, parallel or hybrid.

[0149] One battery cell unit 31 includes a plurality of pouch-shaped battery cells 20 accommodated in a housing 34 , which can improve the energy density of the battery device 100 and the overall performance of the battery device 100 .

[0150] According to some embodiments of the present application, optionally, please combine Figure 2 and Figure 3 The battery device 100 further includes a box body 10 , which includes an inner bottom wall 12 . An end of the first wall 342 of the battery cell unit 31 that is away from the second wall 343 has a first connecting portion 347 , and the first connecting portion 347 is connected to the inner bottom wall 12 .

[0151] The box 10 is the main protection and containment structure of the entire battery device 100, which can reduce the direct impact of the outside world on the inside of the battery device 100 to a certain extent. The box 10 has an inner bottom wall 12. The inner bottom wall 12 can be used to support the pouch-shaped battery cells 20 and provide a stable structural foundation for the battery device 100.

[0152] The first wall 342 of the shell 34 of the battery cell unit 31 has a first connecting portion 347 at one end facing away from the second wall 343. The first connecting portion 347 is connected to the inner bottom wall 12, which can fix the shell 34 in the box body 10, limit the relative position between the shell 34 and the box body 10, and thus limit the relative position between the battery cell unit 31 and the box body 10.

[0153] It can be understood that at least part of the battery cells 31 of the battery device 100 are connected to the inner bottom wall 12 of a box body 10 through the first connecting portion 347, and the inner bottom wall 12 of the box body 10 can provide restraint forces along the first direction F1, the second direction F2 and the third direction F3 for at least part of the battery cells 31.

[0154] The first wall 342 of the battery cell unit 31 has a first connecting portion 347 at one end away from the second wall 343. The first connecting portion 347 is connected to the inner bottom wall 12, which can further reduce or avoid the displacement of the battery cell unit 31 in the box body 10, thereby reducing the failure and safety risks of the pouch-shaped battery cell 20.

[0155] According to some embodiments of the present application, optionally, please combine Figure 2 , the first connecting portion 347 is connected to the inner bottom wall 12 by gluing.

[0156] The first connection portion 347 is connected to the inner bottom wall 12 by gluing, that is, the first connection portion 347 is connected to the inner bottom wall 12 by gluing.

[0157] In some embodiments, adhesive is applied to the surface of the first connection portion 347 facing the inner bottom wall 12 , and the first connection portion 347 of the battery cell unit 31 is bonded to the surface of the inner bottom wall 12 facing the battery cell unit 31 by the adhesive.

[0158] In some embodiments, adhesive is applied to the surface of the inner bottom wall 12 facing the battery cell unit 31 , and the first connection portion 347 of the battery cell unit 31 is bonded to the surface of the inner bottom wall 12 facing the battery cell unit 31 by the adhesive, thereby connecting the battery cell unit 31 to the inner bottom wall 12 .

[0159] The first connection portion 347 is connected to the inner bottom wall 12 by gluing, which can reduce or avoid displacement of the battery monomer unit 31 in the box body 10 to a certain extent and simplify the installation process of the battery monomer unit 31 .

[0160] According to some embodiments of the present application, optionally, please combine Figure 2 , the first connecting portion 347 is connected to the inner bottom wall 12 through insulating glue.

[0161] Insulation glue has both insulating properties and adhesiveness.

[0162] Optionally, the outer surface of the first connection portion 347 is coated with an insulating layer 346 , and the insulating layer 346 is connected to the inner bottom wall 12 via colloid so that the first connection portion 347 is connected to the inner bottom wall 12 .

[0163] The first connection portion 347 is connected to the inner bottom wall 12 by insulating glue, which can reduce or avoid the displacement of the battery cell unit 31 in the box body 10 to a certain extent, and can reduce the risk of abnormal conductivity between the shell 34 of the battery cell unit 31 and the inner bottom wall 12 of the box body 10.

[0164] According to some embodiments of the present application, optionally, please combine Figure 2 The box body 10 includes a heat exchange plate 13, and the inner bottom wall 12 is a side surface of the heat exchange plate 13 facing the battery monomer unit 31. The first connecting portion 347 is connected to the inner bottom wall 12 through a heat conductive adhesive.

[0165] During the operation of the battery device 100, the pouch-shaped battery cell 20 generates heat. The heat of the pouch-shaped battery cell 20 can be transferred to the housing 34, and then transferred from the first connection portion 347 of the housing 34 to the inner bottom wall 12 through the heat-conducting adhesive, that is, to the heat exchange plate 13, thereby adjusting the temperature of the pouch-shaped battery cell 20 and making the pouch-shaped battery cell 20 operate within a normal temperature range.

[0166] The heat exchange plate 13 can exchange heat with the heat exchange medium, thereby dissipating the absorbed heat of the pouch-shaped battery cells 20 to the outside of the battery device 100 , thereby helping to maintain the temperature of the battery device 100 within a safe range and avoiding overheating.

[0167] In some embodiments, the heat exchange plate 13 may provide a channel for the flow of a heat exchange medium, including but not limited to water or other liquids. When the low-temperature heat exchange medium flows in the heat exchange plate 13 , it may exchange heat with the heat exchange plate 13 , thereby absorbing and taking away the heat of the pouch-shaped battery cells 20 .

[0168] In some embodiments, the heat exchange plate 13 can provide heat for the pouch-shaped battery cells 20. Optionally, the heat exchange plate 13 can provide a channel for a high-temperature heat exchange medium to flow, and the high-temperature heat exchange medium includes but is not limited to hot water or other liquids.

[0169] The heat exchange plate 13 can quickly remove the heat generated by the pouch-shaped battery cells 20 or provide heat for the pouch-shaped battery cells 20 , so that the pouch-shaped battery cells 20 operate within a suitable temperature range, which helps to improve the performance of the battery device 100 and reduce the risk of thermal runaway.

[0170] According to some embodiments of the present application, optionally, please combine Figure 2 The inner bottom wall 12 includes a second connecting portion, and the first connecting portion 347 is snap-fitted with the second connecting portion.

[0171] The first connection portion 347 can be connected to the inner bottom wall 12 by snap-fitting with the second connection portion, so as to limit the relative position between the shell 34 and the box body 10 , thereby limiting the relative position between the battery cell unit 31 and the box body 10 .

[0172] It can be understood that at least part of the battery cells 31 of the battery device 100 are connected to the inner bottom wall 12 of the box body 10 through the snap-fitting of the first connecting part 347 and the second connecting part. The inner bottom wall 12 of the box body 10 can provide a restraining force for at least part of the battery cells 31, so that the battery cells 31 can be fixed in the box body 10.

[0173] The inner bottom wall 12 includes a second connecting portion, and the first connecting portion 347 is snap-fitted with the second connecting portion to connect the battery cell unit 31 to the inner bottom wall 12 of the box body 10, which can further reduce or avoid the displacement of the battery cell unit 31 in the box body 10, thereby reducing the failure and safety risks of the pouch-shaped battery cell 20.

[0174] Optionally, in one embodiment, the first connection portion 347 is provided with a slot, and one end of the second connection portion can be at least partially inserted into the slot, so that the first connection portion 347 is snap-fitted with the second connection portion.

[0175] Optionally, in one embodiment, the first connection portion 347 is provided with a slot, and the second connection portion is provided with a protrusion, which can be at least partially inserted into the slot, so that the first connection portion 347 is snap-fitted with the second connection portion.

[0176] Optionally, in one embodiment, the second connection portion is provided with a slot, and one end of the first connection portion 347 can be partially inserted into the slot, so that the first connection portion 347 is snap-fitted with the second connection portion.

[0177] Optionally, in one embodiment, the second connection portion is provided with a slot, and the first connection portion 347 is provided with a protrusion, which can be at least partially inserted into the slot, so that the first connection portion 347 is snap-fitted with the second connection portion.

[0178] According to some embodiments of the present application, optionally, the battery cell unit 31 also includes a positive lead-out portion 311 and a negative lead-out portion 312 located on the second wall 343, and projected onto the second wall 343 along the second direction F2, and the projection of the limiter 32 is completely misaligned with the projection of the positive lead-out portion 311 and the projection of the negative lead-out portion 312.

[0179] The positive lead portion 311 refers to an electrical connection component extending from the positive electrode of the battery cell 31. The negative lead portion 312 refers to an electrical connection component extending from the negative electrode of the battery cell 31. The positive lead portion 311 and the negative lead portion 312 can be used to provide a conduction path for current between the battery cell 31 and other conductive parts.

[0180] In some embodiments, the battery device 100 includes a plurality of cell groups 30. The positive lead-out portion 311 and the negative lead-out portion 312 are located on the second wall 343 of the housing 34 of the battery monomer unit 31, and the plurality of cell groups 30 can be arranged along the first direction F1 and / or the third direction F3. The positive lead-out portion 311 and the negative lead-out portion 312 are both located on the second wall 343, and are completely misaligned with the projection of the stopper 32 along the second direction F2F2 to the second wall 343, so that the three can share at least part of the space along the second direction F2 outside the second wall 343, so that the internal arrangement of the battery device 100 is more regular and compact.

[0181] The positive lead-out portion 311 and the negative lead-out portion 312 are both located on the second wall 343, and are completely misaligned with the projection of the limiting member 32 onto the second wall 343 along the second direction F2, so that the three can share at least part of the space along the second direction F2 outside the second wall 343, making the battery arrangement more regular and compact; and, when projected onto the second wall 343 along the second direction F2, the projection of the limiting member 32 is completely misaligned with the projection of the positive lead-out portion 311 and the projection of the negative lead-out portion 312, which can also avoid physical contact or interference between the limiting member 32 and the positive lead-out portion 311 or the negative lead-out portion 312, thereby effectively improving the stability of the battery device 100.

[0182] According to some embodiments of the present application, optionally, please combine Figure 2 , Figure 4 and Figure 6 The positive electrode connection portion 21 and the negative electrode connection portion 22 of the pouch-shaped battery cell 20 are respectively located at two ends of the pouch-shaped battery cell 20 along the third direction F3. The third direction F3 and the first direction F1 and the second direction F2 are perpendicular to each other.

[0183] The battery cell unit 31 further includes a positive busbar 313 and a negative busbar 314 . The positive busbar 313 is connected to the positive electrode connection portion 21 and the positive electrode lead-out portion 311 , and the negative busbar 314 is connected to the negative electrode connection portion 22 and the negative electrode lead-out portion 312 .

[0184] The positive electrode connection part 21 refers to an electrical connection part extending from the positive electrode of the pouch-shaped battery cell 20. The negative electrode connection part 22 refers to an electrical connection part extending from the negative electrode of the pouch-shaped battery cell 20. The positive electrode connection part 21 and the negative electrode connection part 22 can be used to provide a conduction path for current between the pouch-shaped battery cell 20 and other conductive parts.

[0185] The positive busbar 313 can be used to collect multiple positive electrical connection components into one positive electrical connection component. The negative busbar 314 can be used to collect multiple negative electrical connection components into one negative electrical connection component.

[0186] The positive electrode connection portion 21 of the pouch-shaped battery cell 20 may be connected to the positive electrode lead-out portion 311 of the battery cell unit 31 through the positive electrode busbar 313 .

[0187] The negative electrode connection portion 22 of the pouch-shaped battery cell 20 may be connected to the negative electrode lead-out portion 312 of the battery cell unit 31 through the negative electrode busbar 314 .

[0188] The positive electrode connection part 21 and the negative electrode connection part 22 of the pouch-shaped battery cell 20 can be arranged at the two ends of the pouch-shaped battery cell 20 along the third direction F3, and the positive electrode busbar 313 and the negative electrode busbar 314 are used to lead out and connect the two to the positive electrode connection part 21 and the negative electrode connection part 22 on the second wall 343 of the battery cell unit 31, which is beneficial to optimize the internal space utilization of the battery cell unit 31 and improve the energy density of the battery cell unit 31.

[0189] In some embodiments, four pouch-shaped battery cells 20 are accommodated in the shell 34 of one battery cell unit 31, and the positive electrode connection parts 21 of all the pouch-shaped battery cells 20 are connected to the positive electrode bus 313 of the battery cell unit 31, so that the positive electrode connection parts 21 of the four pouch-shaped battery cells 20 can be connected to the positive electrode lead-out part 311 of the battery cell unit 31.

[0190] In some embodiments, four pouch-shaped battery cells 20 are accommodated in the shell 34 of one battery cell unit 31, and the negative electrode connection parts 22 of all the pouch-shaped battery cells 20 are connected to the negative electrode bus 314 of the battery cell unit 31, so that the negative electrode connection parts 22 of the four pouch-shaped battery cells 20 can be connected to the negative electrode lead-out part 312 of the battery cell unit 31.

[0191] The positive busbar 313 is connected to the positive electrode connection part 21 and the positive electrode lead-out part 311, and the negative electrode busbar 314 is connected to the negative electrode connection part 22 and the negative electrode lead-out part 312. The positive electrode connection parts 21 and negative electrode connection parts 22 of multiple pouch-shaped battery cells 20 can be gathered into a unified positive electrode lead-out part 311 and negative electrode lead-out part 312, which is beneficial to simplify the electrical connection structure of the battery device 100.

[0192] According to some embodiments of the present application, optionally, please combine Figure 3 and Figure 4 The battery cell unit 31 includes two end surfaces along the third direction F3, and the third direction F3 is perpendicular to the first direction F1 and the second direction F2.

[0193] The battery cell unit 31 includes a positive electrode lead-out portion 311 and a negative electrode lead-out portion 312 , and the positive electrode lead-out portion 311 and the negative electrode lead-out portion 312 are respectively located at two end surfaces of the battery cell unit 31 along the third direction F3 .

[0194] The positive lead portion 311 refers to an electrical connection component extending from the positive electrode of the battery cell 31. The negative lead portion 312 refers to an electrical connection component extending from the negative electrode of the battery cell 31. The positive lead portion 311 and the negative lead portion 312 can be used to provide a conduction path for current between the battery cell 31 and other conductive parts.

[0195] In some embodiments, the battery device 100 includes one unit group 30. The positive lead-out portion 311 and the negative lead-out portion 312 are respectively located at two end surfaces of the battery monomer unit 31 along the third direction F3. The distance between the positive lead-out portion 311 and the positive electrode connection portion 21 and the distance between the negative lead-out portion 312 and the negative electrode connection portion 22 can be made shorter, and the transition structure between the positive lead-out portion 311 and the positive electrode connection portion 21 and the transition structure between the negative lead-out portion 312 and the negative electrode connection portion 22 can be simpler.

[0196] In some embodiments, the battery device 100 includes a plurality of cell groups 30. The positive lead-out portion 311 and the negative lead-out portion 312 are respectively located at two end surfaces of the battery cell 31 along the third direction F3. The plurality of cell groups 30 may be arranged along the first direction F1 and / or the third direction F3.

[0197] In two adjacent battery monomer units 31, the two lead-out portions located on the same side end surface along the third direction F3 can be lead-out portions of the same polarity (for example, both are positive lead-out portions 311, or both are negative lead-out portions 312), or lead-out portions of different polarities (one is the positive lead-out portion 311, and the other is the negative lead-out portion 312).

[0198] The positive lead-out portion 311 and the negative lead-out portion 312 are respectively located at the two end surfaces of the battery cell unit 31 along the third direction F3, which is conducive to optimizing the spatial layout of the battery device 100 and leaving sufficient space for other components or electrical connection parts in the second direction F2, making the overall structure of the battery device 100 more compact and easy to assemble.

[0199] According to some embodiments of the present application, optionally, please combine Figure 4 The shell 34 is also provided with a pressure relief structure 348 , which is located on the second wall 343 and projected toward the second wall 343 along the second direction F2 . The projection of the limiting member 32 is completely misaligned with the projection of the pressure relief structure 348 .

[0200] The pressure relief structure 348 refers to a device for releasing excessive pressure inside the battery cell 31. The pressure relief structure 348 can take various forms, such as a valve, a film, a notch, or other forms. When the pressure inside the battery cell 31 reaches a certain threshold, the pressure relief structure 348 can automatically release the pressure, thereby preventing the excessive pressure inside the battery cell 31 from causing the shell 34 to rupture or explode, etc. to a certain extent.

[0201] When projected toward the second wall 343 along the second direction F2, the projection of the limit member 32 and the projection of the pressure relief structure 348 are completely misaligned, which can avoid physical contact or interference between the limit member 32 and the pressure relief structure 348 and can also reduce the probability of damage to the limit member 32 structure when the pressure relief structure 348 is actuated to release pressure, thereby effectively improving the stability of the battery device 100.

[0202] According to some embodiments of the present application, optionally, please combine Figure 2 and Figure 3 The battery device 100 includes a box body 10, an upper cover 11 and a compressible member 33. The upper cover 11 covers the box body 10. The compressible member 33 abuts against the limiting member 32 and the upper cover 11 respectively, so that the upper cover 11 is pressed against the battery monomer unit 31 through the compressible member 33.

[0203] The upper cover 11 can cover the box body 10 to form a relatively closed space, and one or more unit groups 30 can be accommodated in this space.

[0204] The compressible member 33 refers to a component with elastic force that can be compressed by an external force to be deformed and can return to its original shape after the external force disappears.

[0205] The compressible member 33 is respectively abutted between the limit member 32 and the upper cover 11, and can provide a supporting force for the limit member 32 in the second direction F2. Through force conduction, it can provide a supporting force for the battery cell unit 31 in the second direction F2, thereby buffering the external impact, vibration, etc. on the battery cell unit 31.

[0206] The compressible member 33 abuts against the limit member 32 and the upper cover 11 respectively, so that the upper cover 11 presses against the battery cell unit 31 through the compressible member 33, so that the battery cell unit 31 remains stable when subjected to external force along the second direction F2, thereby reducing the displacement of the battery cell unit 31 in the second direction F2 to a certain extent.

[0207] Optionally, in one embodiment, the compressible member 33 and the limiting member 32 have the same shape and size.

[0208] According to some embodiments of the present application, optionally, please combine Figure 4 The limiting member 32 is made of metal, the shell 34 is made of metal, and the limiting member 32 is welded to the shell 34 of the battery monomer unit 31 .

[0209] The stopper 32 is connected to the housing 34 of at least part of the battery cell 31 by welding. When the pouch-shaped battery cell 20 expands, the portion where the stopper 32 is welded to the battery cell 31 can provide a restraining force along the first direction F1 to the battery cell 31, thereby reducing or avoiding the displacement of the battery cell 31 in the box 10 to a certain extent.

[0210] The limiting member 32 is welded to the housing 34 of the battery monomer unit 31, so that the limiting member 32 can provide greater restraint force for at least part of the battery monomer unit 31, further reducing the displacement of the battery monomer unit 31 in the first direction F1, thereby reducing the failure and safety risks of the pouch-shaped battery monomer 20. Moreover, the welding cost is low, the process is fast, and it is easy to implement.

[0211] According to some embodiments of the present application, the present application further provides an energy storage device 1, which includes the battery device 100 described in any of the above schemes, and the battery device 100 is used to store or provide electrical energy.

[0212] The energy storage device 1 includes one or more battery clusters to increase the voltage and capacity of the energy storage device 1. The battery cluster may include multiple battery devices 100, and the multiple battery devices 100 are connected in series through a busbar to increase the voltage of the energy storage device 1. When the energy storage device 1 includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device 1. The definition of the battery device 100 is as mentioned above and will not be repeated here.

[0213] The energy storage device 1 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage device 1 can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device 1 can store electrical energy during low power consumption and provide electrical energy to relevant users or electrical equipment during peak power consumption. The energy storage system 2000 provided in the embodiment of the present application can be any power system that requires the use of the energy storage device 1.

[0214] In some embodiments, the energy storage device 1 is an energy storage container or an energy storage cabinet.

[0215] In some embodiments, the energy storage device 1 may include a cabinet and one or more battery clusters, wherein the battery clusters are accommodated in the cabinet.

[0216] In some embodiments, the energy storage device 1 may include modules such as a thermal management module, a main control module, a master control module, a power distribution module, and a fire protection module.

[0217] As an example, the thermal management module may include a liquid cooling unit that provides cooling liquid for adjusting the temperature of the pouch-shaped battery cells 20 to each battery device 100 through a pipeline.

[0218] As an example, the main control module can be used as a battery management unit of a battery cluster to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power or temperature of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The main control module includes a slave battery management unit SBMU (SBMU), a fusion switch and other modules.

[0219] As an example, the master control module can be used as a battery management unit of the energy storage device 1 to monitor and manage the energy storage device 1. The master control module can monitor information such as the current, voltage, power, state of charge or temperature of the energy storage device 1. For example, the charging and discharging current, voltage, etc. of the energy storage device 1 can be controlled. As an example, the master control module includes an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a master battery management unit MBMU (Master Battery Management Unit, MBMU), Ethernet ETH (EtherNet, ETH) and a fiber optic conversion module.

[0220] As an example, the fire protection module includes a control panel, a detector, an alarm device, etc., which are used to detect, alarm or extinguish fire in the energy storage system 2000.

[0221] As an example, the power distribution module can be used to distribute power to the power modules of the energy storage device 1 .

[0222] According to some embodiments of this application, please combine Figure 7 The present application also provides an energy storage system 2000, which includes a power conversion device 2 and an energy storage device 1 as described in any of the above schemes, and a battery device 100 for storing or providing electrical energy.

[0223] The energy storage system 2000 may include one or more energy storage devices 1 and a power converter 2 (Power Converter System, PCS for short), and the power converter 2 is used to be connected 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 converter 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.

[0224] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery device 100, the energy storage device 1 or the energy storage system 2000 described in any of the above schemes, and the battery device 100 is used to store or provide electrical energy.

[0225] According to some embodiments of this application, please combine Figure 8 The present application also provides a charging network 3000 , which includes a charging pile 4 and an energy storage device 1 or an energy storage system 2000 as described in any of the above schemes, and the energy storage device 1 is used to provide electrical energy to the charging pile 4 .

[0226] The charging network 3000 may include a charging pile 4 and an energy storage device 1, wherein 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 to the charging pile 4. The charging pile 4 is electrically connected to the battery device 100 in the energy storage device 1 through a cable, and the battery device 100 can provide its stored electrical energy to the charging pile 4. The charging pile 4 has one or more connectors 5, and the connector 5 is used to connect to an electrical device (such as a vehicle 1000), so that the electrical device can be replenished. The definition of the battery device 100 is referred to above and will not be repeated here.

[0227] The energy storage device 1 may be located inside the charging pile 4 (eg, an integrated storage and charging device), or may be located outside the charging pile 4 .

[0228] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A battery monomer unit, the battery monomer unit comprising a shell and a pouch-shaped battery monomer, the shell having a receiving cavity, the pouch-shaped battery monomer being arranged in the receiving cavity, the shell comprising two first walls arranged opposite to each other along a first direction, and a second wall located between the two first walls, the second wall being located at one end of the shell along a second direction and connected to the two first walls, the other end of the shell along the second direction forming a first opening, the second direction being perpendicular to the first direction; A limiting member, wherein a plurality of the battery monomer units are arranged along a first direction to form a unit group, the limiting member is located on a side of the second wall of at least some of the battery monomer units in the unit group that is away from the first opening, and the limiting member is used to provide a restraining force along the first direction to the battery monomer units.

2. The battery device according to claim 1, characterized in that: The battery device further includes a first structural member and a second structural member, wherein the first structural member and the second structural member are respectively located at two ends of the unit group along the first direction, and the limiting member connects the first structural member and the second structural member.

3. The battery device according to claim 2, characterized in that: The first structural member and the second structural member are respectively a first beam and a second beam provided at both ends of the unit group along the first direction.

4. The battery device according to claim 1, characterized in that: The limiting member is connected to the second walls of at least a portion of the battery monomer units in the unit group.

5. The battery device according to claim 4, characterized in that: The limiting member is connected to at least a portion of the battery monomer units by adhesive.

6. The battery device according to claim 5, characterized in that: The shell of the battery monomer unit is provided with an adhesive area, the limiting member and the battery monomer unit are connected to each other by adhesive in the adhesive area, an insulating layer is provided on the shell of the battery monomer unit, and a window is opened in the adhesive area of ​​the insulating layer so that the colloid connects the limiting member and the shell of the battery monomer unit through the window.

7. The battery device according to claim 5, characterized in that: The limiting member is connected to at least part of the battery monomer units by using insulating glue.

8. The battery device according to claim 1, characterized in that: One of the battery cell units includes a plurality of the pouch-shaped battery cells accommodated in the housing.

9. The battery device according to claim 1, characterized in that: The battery device further includes a box body, the box body includes an inner bottom wall, and the first wall of the battery monomer unit has a first connecting portion at one end away from the second wall, and the first connecting portion is connected to the inner bottom wall.

10. The battery device according to claim 9, characterized in that: The first connecting portion is connected to the inner bottom wall by gluing.

11. The battery device according to claim 10, characterized in that: The first connecting portion is connected to the inner bottom wall through insulating glue.

12. The battery device according to claim 10, characterized in that: The box body includes a heat exchange plate, the inner bottom wall is a side surface of the heat exchange plate facing the battery monomer unit, and the first connecting portion is connected to the inner bottom wall by heat conductive glue.

13. The battery device according to any one of claims 9 to 12, characterized in that: The inner bottom wall includes a second connecting portion, and the first connecting portion is snap-fitted with the second connecting portion.

14. The battery device according to claim 1, characterized in that: The battery monomer unit further includes a positive lead-out portion and a negative lead-out portion located on the second wall. Projected toward the second wall along the second direction, the projection of the limiting member is completely misaligned with the projection of the positive lead-out portion and the projection of the negative lead-out portion.

15. The battery device according to claim 14, characterized in that: The positive electrode connection part and the negative electrode connection part of the pouch-shaped battery cell are respectively located at two ends of the pouch-shaped battery cell along a third direction, and the third direction is perpendicular to the first direction and the second direction. The battery cell unit further includes a positive busbar and a negative busbar. The positive busbar is connected to the positive connection portion and the positive lead-out portion, and the negative busbar is connected to the negative connection portion and the negative lead-out portion.

16. The battery device according to claim 1, characterized in that: The battery cell unit includes two end surfaces along a third direction, and the third direction is perpendicular to the first direction and the second direction in pairs. The battery cell unit includes a positive electrode lead-out portion and a negative electrode lead-out portion, and the positive electrode lead-out portion and the negative electrode lead-out portion are respectively located at two end surfaces of the battery cell unit along the third direction.

17. The battery device according to claim 1, characterized in that: The shell is further provided with a pressure relief structure, which is located on the second wall. When projected toward the second wall along the second direction, the projection of the limiting member is completely misaligned with the projection of the pressure relief structure.

18. The battery device according to claim 1, characterized in that The battery device comprises a box body, an upper cover and a compressible member, wherein the upper cover covers the box body, and the compressible member abuts against the limiting member and the upper cover respectively, so that the upper cover is pressed against the battery monomer unit through the compressible member.

19. The battery device according to claim 1, characterized in that: The limiting member is made of metal, the shell is made of metal, and the limiting member is welded to the shell of the battery monomer unit.

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

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

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

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

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