Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, the battery device comprises a battery monomer assembly, the battery monomer assembly comprises a plurality of cold plates and a battery monomer group, the cold plates are arranged at intervals along a first direction, an accommodating cavity is formed between any two adjacent cold plates, and the battery monomer group comprises a plurality of soft package battery monomers; the plurality of soft package battery monomers are dispersedly arranged in the plurality of accommodating cavities, and the connecting piece is connected with the plurality of cold plates, so that the plurality of cold plates are connected into a whole, and the movement of the battery monomer group in the second direction is limited. According to the technical scheme, the plurality of cold plates are arranged along the first direction, so that the heat dissipation efficiency of the soft package battery monomers can be improved, the heat exchange area is increased, and the risk of thermal runaway is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] At present, most new energy vehicles use power batteries as energy storage and kinetic energy devices. Power batteries are also used in other types of vehicles. The reliability of power batteries has a relatively important impact on the vehicle's endurance and power performance. Therefore, improving battery reliability is a direction that needs to be focused on in the process of continuous improvement and innovation of batteries. Utility Model Content

[0003] The present application aims to solve one of the technical problems existing in the prior art. To this end, the present application proposes a battery device and an electrical device comprising the battery device, wherein the battery device comprises a battery cell assembly, and the battery cell assembly comprises a liquid cooling plate, a connector and a battery cell group, which can improve the heat dissipation efficiency of the soft-pack battery cell and reduce the risk of thermal runaway of the soft-pack battery cell, thereby improving the reliability of the battery device.

[0004] In a first aspect, an embodiment of the present application provides a battery device, comprising: a box body having a bottom plate for carrying a battery cell assembly; the battery cell assembly comprises: a plurality of cold plates arranged at intervals along a first direction, a receiving cavity being formed between any two adjacent cold plates, and a battery cell group comprising a plurality of soft-pack battery cells, the plurality of soft-pack battery cells being dispersedly arranged in the plurality of receiving cavities, each receiving cavity having at least one soft-pack battery cell, the soft-pack battery cell being bonded to the bottom plate, and a connector connecting the plurality of cold plates so that the plurality of cold plates are connected as a whole and restricting movement of the battery cell group along a second direction, the first direction and the second direction intersecting.

[0005] In the above technical solution, since a receiving cavity is formed between any two adjacent cold plates along the first direction, the battery cell group includes a plurality of soft-pack battery cells, and the plurality of soft-pack battery cells are dispersedly arranged in a plurality of receiving cavities. Compared with the solution in which the cold plate is arranged at the bottom of the soft-pack battery cell, the heat exchange area can be increased, thereby improving the heat dissipation efficiency of the soft-pack battery cell. At the same time, when a soft-pack battery cell in a receiving cavity has thermal runaway, due to the separation effect of the cold plate, the thermal runaway is not easy to spread to the soft-pack battery cell in the adjacent receiving cavity, which is beneficial to reduce the risk of heat diffusion and can improve the reliability of the battery device.

[0006] In addition, the multiple cold plates arranged along the first direction can improve the structural strength of the battery cell assembly, and can reduce the risk of deformation of the soft-pack battery cell when subjected to external force impact; the soft-pack battery cell is bonded to the bottom plate of the box body, which can improve the position stability of the battery cell group, and is not easy to be displaced when subjected to external vibration impact, which is beneficial to improving the main frequency of the battery device; the connector connects the multiple cold plates into a whole, which can improve the structural strength of the battery cell assembly, and at the same time can prevent the soft-pack battery cell from moving along the second direction, which is beneficial to maintaining the structural stability of the battery cell assembly.

[0007] In some embodiments, the connector cover is disposed on one side of the battery cell group along the second direction and cooperates with the plurality of cold plates.

[0008] In the above technical solution, the connector cover is arranged on one side of the battery cell group along the second direction, which can protect the soft-pack battery cell and reduce the risk of foreign matter entering the accommodating cavity and causing damage or short circuit to the soft-pack battery cell. At the same time, it can also prevent the soft-pack battery cell from moving up and down along the second direction when subjected to external impact, which is beneficial to improving the service life of the battery cell assembly.

[0009] In some embodiments, the connecting member is in the shape of a plate.

[0010] In the above technical solution, the connector is in the shape of a plate, has a simple structure, and has high manufacturing efficiency, which is beneficial to reducing costs and improving the grouping efficiency of battery monomer components.

[0011] In some embodiments, the connector is integrally formed with the plurality of cold plates.

[0012] In the above technical solution, the connecting parts are integrally formed with a plurality of cold plates, which is beneficial to reducing component errors, improving structural consistency, improving production efficiency and reducing production costs during production and processing.

[0013] In some embodiments, the connecting member includes a plurality of connecting plates, and a connecting plate is connected between any two adjacent cold plates.

[0014] In the above technical solution, the connecting member includes a plurality of connecting plates, and the plurality of connecting plates are arranged in one-to-one correspondence with the plurality of accommodating cavities. The spacing between adjacent cold plates can be adjusted according to the number of soft-pack battery cells that need to be accommodated in the accommodating cavity, and then the connecting plates of appropriate sizes can be selected, so that the installation method of the battery cell assembly is more flexible and the applicable scenarios are more varied.

[0015] In some embodiments, the connecting plate is in a flat plate shape and covers one side of the soft-pack battery cell in the corresponding receiving cavity along the second direction.

[0016] In the above technical solution, the connecting plate is in the shape of a flat plate and covers one side of the soft-pack battery cell in the corresponding accommodating cavity along the second direction, which can reduce the risk of external foreign matter falling into the accommodating cavity and reduce the possibility of damage or short circuit of the soft-pack battery cell.

[0017] In some embodiments, the connecting plate is integrally formed with any two adjacent cold plates.

[0018] In the above technical solution, the connecting plate is integrally formed with any two adjacent cold plates, which is beneficial to reducing the number of parts, reducing the matching errors between parts, reducing the processing difficulty, and improving structural consistency, improving production efficiency, and reducing production costs during production and processing.

[0019] In some embodiments, the connecting plate includes a first plate and a second plate. Among any two adjacent cold plates, the first plate is connected to one cold plate and covers one side of the soft-pack battery cell in the corresponding accommodating cavity along the second direction. The second plate is connected to another cold plate, covers one side of the soft-pack battery cell in the corresponding accommodating cavity along the first direction, and is connected to the first plate at an angle.

[0020] In the above technical solution, the connecting plate includes a first plate and a second plate connected at an angle, the first plate covers one side of the soft-pack battery cell in the corresponding accommodating cavity along the second direction, and the second plate covers one side of the soft-pack battery cell in the corresponding accommodating cavity along the first direction. When assembling the soft-pack battery cell, there is no need to deform the connecting plate, which can improve the installation accuracy of the battery cell assembly. After the soft-pack battery cell is installed, the risk of external foreign matter entering the accommodating cavity can be reduced. At the same time, the heat of multiple soft-pack battery cells can be directly transferred to one side of the cold plate, and can also be indirectly transferred to the other side of the cold plate through the second plate; the first plate and the second plate are respectively connected to the cold plate, which can make the structure of the battery cell assembly more compact and stable, ensure sufficient contact between the soft-pack battery cell and the cold plate, and help improve the heat dissipation efficiency.

[0021] In some embodiments, the first plate is integrally formed with one cold plate, and / or the second plate is integrally formed with another cold plate.

[0022] In the above technical solution, the first plate and / or the second plate are integrally formed with the cold plate, which is beneficial to reducing the number of parts and components during production and processing, reducing the difficulty of production and processing, reducing the matching errors between parts, improving structural consistency, improving production efficiency, and reducing production costs.

[0023] In some embodiments, the connector is provided with a pressure relief area, and the pressure relief area is used to release the internal pressure of the soft-pack battery cell.

[0024] In the above technical solution, since a pressure relief zone is provided on the connector, the pressure relief zone can timely release the excessive pressure in the accommodating chamber, thereby reducing the risk of explosion or rupture due to excessive pressure in the accommodating chamber, which is beneficial to improving the structural stability of the battery cell assembly.

[0025] In some embodiments, the pressure relief area includes at least one of a weakened portion, a notch, a through hole, and a gap.

[0026] In the above technical solution, the pressure relief zone includes at least one of a weak portion, a notch, a through hole, and a gap. The setting method of the pressure relief zone is flexible, and different pressure relief structures can be set according to different preset pressures to meet different application scenarios.

[0027] In some embodiments, the pressure relief zone is disposed corresponding to a portion of one side of the battery cell group along the second direction; and each accommodating cavity is correspondingly provided with at least one pressure relief zone.

[0028] In the above technical solution, the pressure relief zone is arranged in correspondence with the local part of the battery cell group on one side along the second direction. When thermal runaway occurs in the soft-pack battery cell, directional pressure relief from the second direction can be ensured, thereby reducing the risk of thermal runaway spreading to adjacent accommodating cavities and reducing the risk of short circuit in the battery cell group. At least one pressure relief zone is arranged corresponding to each accommodating cavity. When thermal runaway occurs in the soft-pack battery cell, the pressure relief zone corresponding to the accommodating cavity can release the pressure in the accommodating cavity in time, thereby shortening the reaction time and reducing the risk of explosion or rupture of the accommodating cavity.

[0029] In some embodiments, each accommodating cavity is provided with a plurality of pressure relief zones, and the plurality of pressure relief zones are arranged at intervals.

[0030] In the above technical solution, each accommodating cavity is provided with a plurality of pressure relief zones, and the plurality of pressure relief zones are arranged at intervals, so that the pressure relief area is larger and the pressure relief is faster, which can further reduce the risk of explosion or rupture of the accommodating cavity and is beneficial to improving the safety and stability of the battery device.

[0031] In some embodiments, each accommodating cavity includes a first area and a second area arranged in sequence along a third direction and interconnected; in any two adjacent accommodating cavities, a pressure relief area is correspondingly arranged in the first area of ​​one accommodating cavity, and a pressure relief area is correspondingly arranged in the second area of ​​the other accommodating cavity.

[0032] In the above technical solution, each accommodating cavity includes a first area and a second area interconnected along a third direction. In any two adjacent accommodating cavities, a pressure relief area is correspondingly arranged in the first area of ​​one accommodating cavity, and a pressure relief area is correspondingly arranged in the second area of ​​the other accommodating cavity. The pressure relief areas of adjacent accommodating cavities are arranged in different areas along the third direction, which can ensure that the structure of the connecting piece is more stable and reduce the risk of deformation of the connecting piece. At the same time, since the pressure relief areas of adjacent accommodating cavities are arranged in different areas along the third direction, when a soft-pack battery cell in one accommodating cavity has thermal runaway, the discharged high-temperature and high-pressure substances will be blocked by the connecting piece corresponding to the adjacent accommodating cavity, thereby reducing the risk of heat diffusion and improving the safety of the battery device.

[0033] In some embodiments, a dimension of the first plate along the third direction is L1, a dimension of the soft-pack battery cell along the third direction is L2, and 1 / 2≤L1 / L2<1.

[0034] In the above technical solution, the connector includes a first plate covering the side of the soft-pack battery cell in the corresponding accommodating cavity along the second direction, the size of the first plate along the third direction is larger than half of the size of the soft-pack battery cell along the third direction and smaller than the size of the soft-pack battery cell along the third direction, the size of the first plate can expose a part of the area on the side of the soft-pack battery cell along the second direction, can achieve directional pressure relief, and can also ensure that the soft-pack battery cell has a sufficiently large coverage area along the second direction, reduce the risk of the soft-pack battery cell moving along the second direction, and can reduce the weight of the connector, save materials, and reduce costs.

[0035] In some embodiments, the material of the connector is metal or plastic.

[0036] In the above technical solution, the material of the connector is metal or plastic, which can provide sufficient structural strength for the battery cell assembly, reduce the risk of deformation of the battery cell assembly due to external impact, and improve the life and stability of the battery device.

[0037] In some embodiments, the bottom plate is provided with a slot, and the bottom of the cold plate is inserted into the slot.

[0038] In the above technical solution, a slot is provided on the bottom plate, and the bottom of the cold plate is inserted into the slot, which can improve the connection strength between the battery cell assembly and the bottom plate of the box body, and is not easy to separate from the box body when subjected to external vibration impact. The impact force can be dispersed to the entire box body, so that the force is evenly applied and the cold plate is not easy to deform. At the same time, the cold plate is inserted into the slot, which can reduce the height of the cold plate along the second direction, which is beneficial to saving box body space and improving space utilization.

[0039] In some embodiments, the battery device further includes a thermally conductive structural adhesive, which is disposed on the surface of the bottom plate, and the soft-pack battery cells are bonded to the bottom plate through the thermally conductive structural adhesive.

[0040] In the above technical solution, the battery device includes a thermally conductive structural adhesive arranged on the surface of the bottom plate. The soft-pack battery cells are bonded to the bottom plate by the thermally conductive structural adhesive, which can improve the connection strength between the battery cell group and the box body and reduce the risk of displacement and deformation of the soft-pack battery cells. At the same time, the thermally conductive structural adhesive can conduct the heat generated by the soft-pack battery cells to the bottom plate of the box body, which is beneficial to reduce the temperature of the soft-pack battery cells and reduce the risk of thermal runaway.

[0041] In some embodiments, the soft-pack battery cell includes two first surfaces opposite to each other along a first direction and two second surfaces opposite to each other along a second direction, the surface area of ​​the first surface is larger than that of the second surface, and the projection of the cold plate along the first direction covers the first surface.

[0042] In the above technical solution, the soft-pack battery cell includes two first surfaces opposite to each other along a first direction and two second surfaces opposite to each other along a second direction, the surface area of ​​the first surface is larger than that of the second surface, the projection of the cold plate along the first direction covers the first surface, and the cold plate covers the first surface of the soft-pack battery cell, which can increase the heat exchange area between the soft-pack battery cell and the cold plate, improve the heat dissipation efficiency of the soft-pack battery cell, reduce the risk of thermal runaway of the soft-pack battery, and provide protection for the soft-pack battery cell along the first direction. When subjected to impact force along the first direction, the risk of damage and deformation of the soft-pack battery cell can be reduced, thereby improving the safety of the battery device.

[0043] In some embodiments, the first surface and the second surface of any soft-pack battery cell are connected by a transition portion.

[0044] In the above technical solution, the first surface and the second surface of any soft-pack battery are connected via a transition portion, which can increase the connection strength and reduce the risk of cracking of the soft-pack battery single body shell.

[0045] In some embodiments, the transition portion is an R angle.

[0046] In the above technical solution, the transition portion is an R angle, which is conducive to the processing and manufacturing of the soft-pack battery monomer shell, improves the shell's ability to resist cracking, and can improve the production efficiency of the soft-pack battery monomer.

[0047] In some embodiments, a glue blocking structure is provided between R corners of any two adjacent soft-pack battery cells in the same accommodating cavity, and the glue blocking structure is provided at the bottom of the box body.

[0048] In the above technical solution, a glue blocking structure is arranged between the R corners of any two adjacent soft-pack battery cells in the same accommodating cavity, which can prevent glue from overflowing to the R corner when the soft-pack battery cell is bonded to the box body, thereby reducing the risk of stress concentration at the R corner of the soft-pack battery cell.

[0049] In some embodiments, the glue blocking structure is a glue blocking strip.

[0050] In the above technical solution, the glue blocking structure is a glue blocking strip, which can be directly bonded to the bottom of the box body, has a simple structure, is easy to install, and has high reliability.

[0051] In some embodiments, the battery device further includes an expansion beam, the expansion beam is connected to the bottom plate, and the cold plates on both sides along the first direction abut against the expansion beam.

[0052] In the above technical solution, the battery device also includes an expansion beam, which is connected to the bottom plate, and the cold plates on both sides along the first direction abut against the expansion beam, which can reduce the number of components inside the box, improve the utilization rate of the internal space of the box, and accommodate more battery cell assemblies, which is beneficial to improving the capacity of the battery device. The expansion beam abuts against the cold plate along the first direction, which can absorb the expansion force of the soft-pack battery cell and reduce the risk of deformation and damage of the cold plate.

[0053] In some embodiments, the soft-pack battery cell is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

[0054] In the above technical solution, the soft-pack battery cell is set to be any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell, so that the soft-pack battery cell can be flexibly set to different types of battery cells according to the needs of the usage scenario.

[0055] In a second aspect, the present application provides an electrical device, comprising a battery device according to the first aspect of the present application.

[0056] In the above-mentioned embodiment, by setting the battery device of the first aspect, since a receiving cavity is formed between any two adjacent cold plates, the battery cell group includes a plurality of soft-pack battery cells, and the plurality of soft-pack battery cells are dispersedly arranged in a plurality of receiving cavities, the heat dissipation efficiency of the soft-pack battery cells can be improved. When a soft-pack battery cell in one receiving cavity has thermal runaway, due to the separation effect of the cold plate, the thermal runaway is not easy to spread to the soft-pack battery cell in the adjacent receiving cavity, which is beneficial to reduce the risk of heat diffusion. At the same time, the plurality of cold plates arranged along the first direction can improve the structural strength of the battery cell assembly, and can reduce the risk of deformation of the soft-pack battery cell when subjected to external force impact. The soft-pack battery cell is bonded to the bottom plate of the box body, which can improve the position stability of the battery cell group. When subjected to external vibration and impact, it is not easy to move, which is beneficial to improving the main frequency of the battery device. The connector connects multiple cold plates into a whole, which can improve the structural strength of the battery cell assembly and prevent the soft-pack battery cell from moving along the second direction, which is beneficial to maintaining the structural stability of the battery cell assembly. In addition, the cold plate inserted into the box body can also disperse the external impact force, reduce the probability of a single soft-pack battery cell being subjected to excessive impact force, and increase the service life of the soft-pack battery cell and the service life of the battery device, thereby improving the overall performance of the electrical device.

[0057] In some embodiments, the electrical device includes a vehicle, the vehicle includes a floor, the box includes an opening, and the floor covers the opening.

[0058] In the above technical solution, the electrical device includes a vehicle, the vehicle includes a floor, the box includes an opening, and the floor cover is closed on the opening. The box of the battery device uses the vehicle's own floor as a box cover for sealing, which can reduce costs and improve space utilization, increase the capacity of the box and improve the height of the vehicle chassis.

[0059] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 is a schematic structural diagram of a vehicle according to an embodiment of the present application;

[0061] Figure 2 is a schematic structural diagram of a battery device according to an embodiment of the present application;

[0062] Figure 3 is an axonometric view of a battery cell assembly according to some embodiments of the present application;

[0063] Figure 4 is an axonometric view of a battery cell assembly according to some other embodiments of the present application;

[0064] Figure 5 is a side view of a battery cell assembly according to some embodiments of the present application;

[0065] Figure 6 is a side view of a battery cell assembly according to other embodiments of the present application;

[0066] Figure 7 is a side view of a battery cell assembly according to some other embodiments of the present application;

[0067] Figure 8 is based on Figure 4 A top view of a battery cell assembly of some embodiments is shown;

[0068] Fig. 9 is based on Figure 3 An enlarged partial view of a battery cell assembly of some embodiments is shown.

[0069] Reference numerals:

[0070] 1. Electrical device; 100. Battery device; 200. Controller; 300. Motor; 400. Box; 410. Bottom plate; 500. Battery cell assembly; 510. Cold plate; 520. Accommodation cavity; 530. Battery cell group; 5301. Soft-pack battery cell; 600. Connector; 610. Connecting plate; 6101. First plate; 6102. Second plate; X, first direction; Y, second direction; Z, third direction; 700. Pressure relief area; 710. First area; 720. Second area; 532. First surface; 533. Second surface; 420. Opening; 540. Glue blocking structure. DETAILED DESCRIPTION

[0071] The following embodiments of the technical solution of the present application will be 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two).

[0077] 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", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They 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. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0078] 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.

[0079] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include one or more battery cells. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar component.

[0080] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, and a battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0081] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0082] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0083] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0084] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0085] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0086] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0087] In some embodiments, the battery device refers to an energy storage device, which includes a box body, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0088] The battery cells mentioned in the embodiments of the present application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., which are not limited in the embodiments of the present application. The battery cells may be cylindrical, flat, rectangular or other shapes, etc., which are not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which are not limited in the embodiments of the present application.

[0089] Exemplarily, a battery cell may generally include a shell, a battery cell assembly and an electrolyte, wherein the shell is used to contain the battery cell assembly and the electrolyte, and the shell is provided with at least one positive electrode column and at least one negative electrode column. The battery cell assembly includes one or more electrode assemblies, and the electrode assembly is formed by stacking or winding a positive electrode sheet, a negative electrode sheet and a separator.

[0090] Among them, the positive electrode sheet can generally include a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab sheet, and a plurality of positive electrode tab sheets are stacked together and electrically connected to the positive electrode column. Exemplarily, the plurality of stacked positive electrode tab sheets can be directly welded to the positive electrode column to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter sheet, the plurality of stacked positive electrode tab sheets are welded to one end of the positive electrode adapter sheet, and the other end of the positive electrode adapter sheet is welded to the positive electrode column, so that the positive electrode tab sheet is electrically connected to the positive electrode column.

[0091] The negative electrode sheet can generally include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is directly or indirectly coated on the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab sheet, and a plurality of negative electrode tab sheets are stacked together and electrically connected to the negative electrode column. Exemplarily, a plurality of negative electrode tab sheets stacked together can be directly welded to the negative electrode column to form an electrical connection; or, the battery cell assembly can also include a negative electrode adapter sheet, a plurality of negative electrode tab sheets stacked together are welded to one end of the negative electrode adapter sheet, and the other end of the negative electrode adapter sheet is welded to the negative electrode column, so that the negative electrode tab sheet is electrically connected to the negative electrode column. The material of the separator is not limited, for example, it can be polypropylene or polyethylene.

[0092] At the same time, battery cells mainly rely on the movement of metal ions between the positive electrode and the negative electrode to work. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, the material of the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc., the material of the negative electrode current collector can be copper, and the material of the negative electrode active material layer can be carbon or silicon, etc. During the charge and discharge process, Li+ is embedded and de-embedded back and forth between the two electrodes: when charging, Li+ is de-embedded from the positive electrode, embedded in the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.

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

[0094] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, battery devices, as the power source of electric vehicles, play an irreplaceable and important role. Among them, battery devices, as core components of new energy vehicles, have high requirements in terms of energy density and reliability.

[0095] Since the soft-pack battery cell uses an aluminum-plastic film to wrap the electrode assembly and electrolyte, the aluminum-plastic film is light in weight and can significantly reduce the weight of the battery device and improve the energy density of the battery device.

[0096] However, when the battery device in the related art adopts soft-pack battery cells, due to the low strength of the aluminum-plastic film, when multiple soft-pack battery cells are arranged in a box, the soft-pack battery cells in the box are prone to thermal runaway due to the low heat dissipation efficiency, and the aluminum-plastic film has low structural strength, which causes the soft-pack battery cells to be easily deformed. When subjected to external impact, there is a risk of short circuit.

[0097] Based on the above considerations, in order to improve the heat dissipation efficiency of soft-pack battery cells, reduce the risk of thermal runaway, and reduce the mutual extrusion between soft-pack battery cells, the present application designs a battery device, which includes a battery cell assembly, and the battery cell assembly includes: multiple cold plates, a battery cell group, and a connector; the multiple cold plates are arranged at intervals along the thickness direction of the soft-pack battery cell, and a receiving cavity is formed between any two adjacent cold plates; the battery cell group includes multiple soft-pack battery cells, and the multiple soft-pack battery cells are dispersedly arranged in the multiple receiving cavities, each receiving cavity has at least one soft-pack battery cell, which can improve the heat dissipation efficiency of the soft-pack battery cell and enhance the impact resistance of the soft-pack battery cell. The soft-pack battery cell is bonded to the bottom plate, which can improve the position stability of the soft-pack battery cell, reduce the probability of displacement of the soft-pack battery cell, and reduce the risk of short circuit of the soft-pack battery cell; the connector connects the multiple cold plates so that the multiple cold plates are connected as a whole, and limits the movement of the battery cell group along the width direction of the soft-pack battery cell, which is beneficial to improve the structural strength of the battery cell assembly.

[0098] The embodiment of the present application provides an electric device using the battery pack or battery device disclosed herein as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0099] For the convenience of explanation, the following embodiments take the electric device 1 as a vehicle as an example, and describe in detail the structures of the electric device 1, the battery device 100 and the battery cell assembly 500 of the present application.

[0100] Please refer to Figure 1 , Figure 1 The power device 1 provided for some embodiments of the present application is a structural schematic diagram of a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The vehicle is provided with a battery device 100, and the battery device 100 can be arranged at the bottom, head or tail of the vehicle. The battery device 100 can be used for powering the vehicle, for example, the battery device 100 can be used as an operating power source for the vehicle. The vehicle 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 the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present application, the battery device 100 can be used not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0101] Please refer to Figure 2 , Figure 2 The schematic diagram of the structure of the battery device 100 provided in some embodiments of the present application. The battery device includes a box body 400 and a battery cell assembly 500. The box body 400 is used to provide an assembly space for the battery cell assembly 500. The battery cell assembly 500 is accommodated in the box body 400.

[0102] Reference below Figure 3-Figure 8 A battery device 100 according to an embodiment of the first aspect of the present application is described. Figure 3 is an isometric view of a battery cell assembly 500 according to some embodiments of the present application; Figure 4 is an axonometric view of a battery cell assembly 500 according to some other embodiments of the present application; Figure 5 is a side view of a battery cell assembly 500 according to some embodiments of the present application; Figure 6 is a side view of a battery cell assembly 500 according to some other embodiments of the present application; Figure 7 is a side view of a battery cell assembly 500 according to some other embodiments of the present application; Figure 8 is based on Figure 4 A top view of a battery cell assembly 500 of some embodiments is shown. Fig. 9 is based on Figure 3 An enlarged partial view of a battery cell assembly 500 of some embodiments is shown.

[0103] The present application embodiment provides a battery device 100, such as Figure 3-Figure 5 As shown, the battery device 100 includes: a box body 400, having a bottom plate 410 for carrying a battery cell assembly 500; the battery cell assembly 500 includes: a plurality of cold plates 510, which are arranged at intervals along a first direction X, and a receiving cavity 520 is formed between any two adjacent cold plates 510, and a battery cell group 530, including a plurality of soft-pack battery cells 5301, the plurality of soft-pack battery cells 5301 are dispersedly arranged in the plurality of receiving cavities 520, each receiving cavity 520 has at least one soft-pack battery cell 5301, and the soft-pack battery cell 5301 is bonded to the bottom plate 410, and a connector 600, connecting the plurality of cold plates 510, so that the plurality of cold plates 510 are connected as a whole, and restricting the movement of the battery cell group 530 along a second direction Y, and the first direction X and the second direction Y intersect.

[0104] In some embodiments, the soft-pack battery cell 5301 includes a film shell and an electrode assembly and an electrolyte wrapped in the film shell, wherein the film shell can be an aluminum-plastic film, and the electrode assembly includes a stacked positive electrode sheet, a negative electrode sheet and a separator.

[0105] The first direction X refers to the thickness direction of the soft-pack battery cell 5301 , the second direction Y refers to the width direction of the soft-pack battery cell 5301 , and the third direction Z refers to the length direction of the soft-pack battery cell 5301 .

[0106] The cold plate 510 has a flow channel for accommodating a cooling medium therein. The cold plate 510 is used to directly or indirectly contact the soft-pack battery cell 5301 to improve the heat dissipation efficiency of the soft-pack battery cell 5301 .

[0107] The number of soft-pack battery cells 5301 of the battery cell group 530 is not less than two. For example, the battery cell group 530 may include two, four, five, seven, eight, ten, fifteen, twenty, thirty or more soft-pack battery cells 5301 .

[0108] An accommodating cavity 520 is formed between any two adjacent cold plates 510 along the first direction X. The accommodating cavity 520 is used to accommodate soft-pack battery cells 5301 . The number of soft-pack battery cells 5301 in each accommodating cavity 520 may be the same or different.

[0109] The accommodating cavity 520 has openings on both sides along the second direction Y. The side of the soft-pack battery cell 5301 close to the bottom plate 410 is bonded to the bottom plate 410 of the box body 400 through the bottom opening of the accommodating cavity 520. The top opening of the side of the accommodating cavity 520 away from the bottom plate 410 is covered with a connector 600. The connector 600 is plate-shaped and connects multiple cold plates 510 so that the multiple cold plates 510 are connected as a whole, which can limit the movement of the battery cell group 530 along the second direction Y.

[0110] In the above technical solution, since a receiving cavity 520 is formed between any two adjacent cold plates 510, the battery cell group 530 includes a plurality of soft-pack battery cells 5301, and the plurality of soft-pack battery cells 5301 are dispersedly arranged in the plurality of receiving cavities 520, the heat dissipation efficiency of the soft-pack battery cells 5301 can be improved. When a soft-pack battery cell 5301 in a receiving cavity 520 has a thermal runaway, due to the separation effect of the cold plate 510, the thermal runaway is not easy to spread to the soft-pack battery cell 5301 in the adjacent receiving cavity 520, which is conducive to reducing the risk of heat diffusion. At the same time, the plurality of cold plates 510 arranged along the first direction X can improve the heat dissipation of the battery cell assembly 500. The structural strength can reduce the risk of deformation of the soft-pack battery cell 5301 when subjected to external force impact; the soft-pack battery cell 5301 is bonded to the bottom plate 410 of the box body 400, which can improve the position stability of the battery cell group 530, and is not easy to be displaced when subjected to external vibration impact, which is beneficial to improving the main frequency of the battery device 100; the connector 600 connects multiple cold plates 510 into a whole, which can improve the structural strength of the battery cell assembly 500, and at the same time can prevent the soft-pack battery cell 5301 from moving along the second direction Y, which is beneficial to maintaining the structural stability of the battery cell assembly 500 and improving the safety and service life of the battery device 100.

[0111] In some embodiments of the present application, the connector 600 is disposed on one side of the battery cell group 530 along the second direction Y and cooperates with the plurality of cold plates 510 .

[0112] The connector 600 is plate-shaped and covers one side of the battery cell group 530 along the width direction of the soft-pack battery cell 5301 . It can be connected to the multiple cold plates 510 into a whole by bolt connection, clamping, riveting, welding or gluing.

[0113] In the above technical solution, the connector 600 is covered on one side of the battery cell group 530 along the second direction Y, which can protect the soft-pack battery cell 5301 and reduce the risk of foreign matter entering the accommodating cavity 520 and causing damage or short circuit to the soft-pack battery cell 5301. At the same time, it can also prevent the soft-pack battery cell 5301 from moving up and down along the second direction Y when subjected to external impact, which is beneficial to improving the service life of the battery cell assembly 500.

[0114] In some embodiments, the connector 600 is in the shape of a plate.

[0115] In the above technical solution, the connector 600 is in the shape of a plate, has a simple structure, and has high manufacturing efficiency, which is beneficial to reducing costs and improving the grouping efficiency of the battery cell assembly 500.

[0116] In some embodiments, the connector 600 is integrally formed with the plurality of cold plates 510 .

[0117] In the above technical solution, the connector 600 and the plurality of cold plates 510 are integrally formed, which is beneficial to reducing component errors, improving structural consistency, increasing production efficiency, and reducing production costs during production and processing.

[0118] In some embodiments, the connector 600 includes a plurality of connecting plates 610 , and one connecting plate 610 is connected between any two adjacent cold plates 510 .

[0119] The connecting member 600 includes a plurality of independent connecting plates 610 , and the plurality of connecting plates 610 are arranged in one-to-one correspondence with the plurality of accommodating cavities 520 . The connecting plates 610 and the cold plates 510 forming the corresponding accommodating cavities 520 may be integrally formed or separately connected.

[0120] In the above technical solution, the connector 600 includes a plurality of connecting plates 610, and the plurality of connecting plates 610 are arranged in one-to-one correspondence with the plurality of accommodating cavities 520. The spacing between adjacent cold plates 510 can be adjusted according to the number of soft-pack battery cells 5301 that need to be accommodated in the accommodating cavities 520, and then the connecting plates 610 of appropriate sizes can be selected, so that the installation method of the battery cell assembly 500 is more flexible and the applicable scenarios are more varied.

[0121] In some embodiments, the connecting plate 610 is in a flat plate shape and covers one side of the soft-pack battery cell 5301 in the corresponding receiving cavity 520 along the second direction Y.

[0122] In the above technical solution, the connecting plate 610 is in the shape of a flat plate and covers one side of the soft-pack battery cell 5301 in the corresponding accommodating cavity 520 along the second direction Y, which can reduce the risk of external foreign matter falling into the accommodating cavity 520 and reduce the possibility of damage or short circuit of the soft-pack battery cell 5301.

[0123] In some embodiments, the connection plate 610 is integrally formed with any two adjacent cold plates 510 .

[0124] In the above technical solution, the connecting plate 610 is integrally formed with any two adjacent cold plates 510, which is beneficial to reduce the number of parts, reduce the matching errors between parts, reduce the processing difficulty, and is beneficial to improve structural consistency, improve production efficiency, and reduce production costs during production and processing.

[0125] In some embodiments, the connecting plate 610 includes a first plate 6101 and a second plate 6102. Among any two adjacent cold plates 510, the first plate 6101 is connected to one cold plate 510 and covers the soft-pack battery cell 5301 in the corresponding accommodating cavity 520 on one side along the second direction Y. The second plate 6102 is connected to another cold plate 510, covers the soft-pack battery cell 5301 in the corresponding accommodating cavity 520 on one side along the first direction X, and is connected to the first plate 6101 at an angle.

[0126] The connecting plate 610 is L-shaped, and includes a first plate 6101 and a second plate 6102 that are connected to each other. The first plate 6101 extends along the first direction X to cover the side of the soft-pack battery cell 5301 in the corresponding accommodating cavity 520 along the second direction Y, and the second plate 6102 extends along the second direction Y to cover the side of the soft-pack battery cell 5301 in the corresponding accommodating cavity 520 along the first direction X.

[0127] The first plate 6101 and the second plate 6102 are respectively connected to two corresponding cold plates 510 forming the accommodating cavity 520 , wherein the second plate 6102 is disposed in close contact with the cold plate 510 .

[0128] In the above technical solution, the connecting plate 610 includes a first plate 6101 and a second plate 6102 connected at an angle, the first plate 6101 covers the side of the soft-pack battery cell 5301 in the corresponding accommodating cavity 520 along the second direction Y, and the second plate 6102 covers the side of the soft-pack battery cell 5301 in the corresponding accommodating cavity 520 along the first direction X. When the soft-pack battery cell 5301 is assembled, there is no need to deform the connecting plate 610, which can improve the installation accuracy of the battery cell assembly 500. After the single cell 5301 is installed, the risk of external foreign matter entering the accommodating cavity 520 can be reduced. At the same time, the heat of multiple soft-pack battery single cells 5301 can be directly transferred to the cold plate 510 on one side, and can also be indirectly transferred to the cold plate 510 on the other side through the second plate 6102; the first plate 6101 and the second plate 6102 are respectively connected to the cold plate 510, which can make the structure of the battery single cell assembly 500 more compact and stable, ensure sufficient contact between the soft-pack battery single cell 5301 and the cold plate 510, and help improve the heat dissipation efficiency.

[0129] In some embodiments, the first plate 6101 is integrally formed with one cold plate 510 , and / or the second plate 6102 is integrally formed with another cold plate 510 .

[0130] In the above technical solution, the first plate 6101 and / or the second plate 6102 are integrally formed with the cold plate 510, which is beneficial to reducing the number of parts and components, reducing the difficulty of production and processing, reducing the matching errors between parts, improving structural consistency, improving production efficiency, and reducing production costs during production and processing.

[0131] In some embodiments, the connector 600 is provided with a pressure relief area 700 , and the pressure relief area 700 is used to release the internal pressure of the soft-pack battery cell 5301 .

[0132] During the operation of the battery cell assembly 500, if a soft-pack battery cell 5301 experiences thermal runaway, the rapidly rising internal pressure can be released through the pressure relief area 700, and the pressure can be transmitted to the outside of the accommodating cavity 520, thereby reducing the risk of explosion or rupture of the accommodating cavity 520 due to excessive internal pressure, which is beneficial to improving the stability of the battery cell assembly 500.

[0133] In the above technical solution, since the pressure relief zone 700 is provided on the connector 600, the pressure relief zone 700 can timely release the excessive pressure in the accommodating chamber 520, thereby reducing the risk of explosion or rupture due to excessive pressure in the accommodating chamber 520, which is beneficial to improving the structural stability of the battery cell assembly 500.

[0134] In some embodiments, the pressure relief area 700 includes at least one of a weakened portion, a notch, a through hole, and a gap.

[0135] The weak portion refers to a local specific area on the connecting member 600, where the strength of the local specific area is lower than the strength of other areas due to the combined influence of material properties, geometric shape, size thickness or other factors.

[0136] When the battery cell assembly 500 is operating normally, the weak portion can maintain structural integrity. However, when subjected to external or internal forces exceeding a certain limit (such as a preset pressure), the weak portion will deform, rupture or fail earlier than other areas of the connector 600, thereby achieving communication between the interior of the accommodating cavity 520 and the external space to achieve pressure relief.

[0137] In some examples, the weak portion may be made of a material with lower strength than other parts of the connector 600. In some examples, the thickness of the weak portion may be thinner than the thickness of other areas of the connector 600. In some embodiments, the weak portion may be formed with a weakened hole or a weakened groove.

[0138] The pressure relief area 700 is a notch that can produce stress concentration. When the pressure in the accommodating cavity 520 increases, the stress will first accumulate in the notched or etched part, so that the area can be accurately ruptured or deformed under the preset pressure, thereby achieving pressure relief. In this way, the rupture direction of the pressure relief area 700 can be guided, the pressure relief area of ​​the pressure relief area 700 after rupture is increased, and the speed and efficiency of pressure relief are improved.

[0139] It should be noted that by precisely controlling the depth, width and shape of the notch, the strength of the pressure relief zone 700 can be adjusted, and the pressure threshold of the pressure relief can be flexibly set according to different soft-pack battery cells 5301 .

[0140] The pressure relief zone 700 can also be a through hole that passes through the connector 600 along the thickness direction of the connector 600. It should be noted that the through hole connects the inner and outer spaces of the connector 600. By controlling the size and number of the through holes, the pressure relief pressure threshold can be accurately set. Since the total cross-sectional area of ​​the through holes in the pressure relief zone 700 is constant, a stable pressure relief rate can be guaranteed.

[0141] The pressure relief area 700 can also be a notch formed by inward depression along the circumferential edge of the connector 600. The area of ​​the notch can be determined according to the size of the preset pressure relief pressure, thereby ensuring a stable pressure relief rate. The pressure relief area 700 is a notch that passes through the connector 600. The notch has a simple structure, is easy to process, has stable and reliable pressure relief performance, and can also reduce material costs.

[0142] In the above technical solution, the pressure relief zone 700 includes at least one of a weak portion, a notch, a through hole, and a gap. The setting method of the pressure relief zone 700 is flexible, and different pressure relief structures can be set according to different preset pressures to meet different application scenarios.

[0143] In some embodiments, the pressure relief area 700 is disposed corresponding to a portion of the battery cell group 530 on one side along the second direction Y; and each accommodating cavity 520 is correspondingly provided with at least one pressure relief area 700 .

[0144] The battery cell group 530 includes a plurality of soft-pack battery cells 5301, and the plurality of soft-pack battery cells 5301 are dispersedly arranged in a plurality of accommodating cavities 520. The pressure relief area 700 is arranged on one side of the battery cell group 530 along the second direction Y. Each accommodating cavity 520 is correspondingly provided with at least one pressure relief area 700, which can increase the pressure relief speed, shorten the reaction time, and improve the safety of the battery device 100. One accommodating cavity 520 can be correspondingly provided with a plurality of pressure relief areas 700 spaced apart along the length direction of the soft-pack battery cell 5301. The positions of the pressure relief areas 700 corresponding to any two adjacent accommodating cavities 520 along the length direction of the soft-pack battery cell 5301 can be the same, or can be staggered.

[0145] In the above technical solution, the pressure relief zone 700 is arranged in correspondence with the local part of the battery cell group 530 on one side along the second direction Y. When the soft-pack battery cell 5301 has thermal runaway, the pressure relief from the second direction Y can be ensured, thereby reducing the risk of thermal runaway spreading to the adjacent accommodating cavity 520, and at the same time reducing the risk of short circuit of the battery cell group 530; each accommodating cavity 520 is correspondingly provided with at least one pressure relief zone 700. When the soft-pack battery cell 5301 has thermal runaway, the pressure relief zone 700 corresponding to the accommodating cavity 520 can timely release the pressure in the accommodating cavity 520, thereby shortening the reaction time and reducing the risk of explosion or rupture of the accommodating cavity 520.

[0146] In some embodiments, each accommodating cavity 520 is correspondingly provided with a plurality of pressure relief areas 700 , and the plurality of pressure relief areas 700 are arranged at intervals.

[0147] One accommodating cavity 520 may be provided with a plurality of pressure relief areas 700 spaced apart along the length direction of the soft-pack battery cell 5301 . The pressure relief areas 700 corresponding to any two adjacent accommodating cavities 520 may be located at the same position along the length direction of the soft-pack battery cell 5301 , or may be staggered.

[0148] In the above technical solution, each accommodating cavity 520 is correspondingly provided with a plurality of pressure relief areas 700 , and the plurality of pressure relief areas 700 are arranged at intervals, so that the pressure relief area is larger and the pressure relief is faster, which can further reduce the risk of explosion or rupture of the accommodating cavity 520 , and is beneficial to improving the safety and stability of the battery device 100 .

[0149] In some embodiments, each accommodating cavity 520 includes a first area 710 and a second area 720 which are arranged in sequence along a third direction and are interconnected; in any two adjacent accommodating cavities 520, the first area 710 of one accommodating cavity 520 is correspondingly provided with a pressure relief area 700, and the second area 720 of the other accommodating cavity 520 is correspondingly provided with a pressure relief area 700.

[0150] The third direction refers to the length direction of the soft-pack battery cell 5301 .

[0151] Each accommodating cavity 520 includes a first area 710 and a second area 720 which are arranged in sequence along a third direction and are interconnected. The pressure relief areas 700 corresponding to any two adjacent accommodating cavities 520 are respectively located in different areas. For example, the pressure relief area 700 of one accommodating cavity 520 is located in the first area 710, and the pressure relief area 700 of the other accommodating cavity 520 is located in the second area 720, and vice versa.

[0152] In the above technical solution, each accommodating cavity 520 includes a first area 710 and a second area 720 interconnected along a third direction. In any two adjacent accommodating cavities 520, a pressure relief area 700 is correspondingly provided in the first area 710 of one accommodating cavity 520, and a pressure relief area 700 is correspondingly provided in the second area 720 of the other accommodating cavity 520. The pressure relief areas 700 of adjacent accommodating cavities 520 are arranged in different areas along the third direction, which can ensure that the structure of the connector 600 is more stable and reduce the risk of deformation of the connector 600. At the same time, since the pressure relief areas 700 of adjacent accommodating cavities 520 are arranged in different areas along the third direction, when the soft-pack battery cell 5301 in one accommodating cavity 520 has thermal runaway, the discharged high-temperature and high-pressure substances will be blocked by the connector 600 corresponding to the adjacent accommodating cavity 520, thereby reducing the risk of heat diffusion and improving the safety of the battery device 100.

[0153] In some embodiments, the dimension of the first plate 6101 along the third direction is L1, the dimension of the soft-pack battery cell 5301 along the third direction is L2, and 1 / 2≤L1 / L2<1.

[0154] In the above technical solution, the connector 600 includes a first plate 6101 covering the side of the soft-pack battery cell 5301 in the corresponding accommodating cavity 520 along the second direction Y. The size of the first plate 6101 along the third direction is greater than half of the size of the soft-pack battery cell 5301 along the third direction and smaller than the size of the soft-pack battery cell 5301 along the third direction. The size of the first plate 6101 can expose a partial area of ​​the soft-pack battery cell 5301 along the second direction Y, thereby achieving directional pressure relief. At the same time, it can also ensure that the soft-pack battery cell 5301 has a sufficiently large coverage area along the second direction Y, thereby reducing the risk of the soft-pack battery cell 5301 moving along the second direction Y, and at the same time can reduce the weight of the connector 600, save materials, and reduce costs.

[0155] In some embodiments, the material of the connector 600 is metal or plastic.

[0156] Optionally, in some embodiments, when the material of the connector 600 is metal, it may be aluminum or steel, etc., and when the material of the connector 600 is plastic, it may be a composite material with higher hardness or a non-metallic material such as PA, PC, PET, etc.

[0157] The material of the connector 600 is metal or plastic. Compared with the aluminum-plastic film shell of the soft-pack battery cell 5301, the connector 600 has a stable structure and higher strength, which can effectively protect the soft-pack battery cell 5301, reduce the risk of damage to the soft-pack battery cell 5301, and improve the stability and service life of the battery cell group 530; at the same time, the connector 600 is supported between the cold plates 510, which can reduce the probability of deformation of the accommodating cavity 520 where the soft-pack battery cell 5301 is located, and reduce the possibility of damage to the soft-pack battery cell 5301 caused by extrusion of the cold plate 510.

[0158] In the above technical solution, the material of the connector 600 is metal or plastic, which can provide sufficient structural strength for the battery cell assembly 500, reduce the risk of deformation of the battery cell assembly 500 due to external impact, and improve the life and stability of the battery device 100.

[0159] In some embodiments, the bottom plate 410 is provided with a slot, and the bottom of the cold plate 510 is inserted into the slot.

[0160] In the above technical solution, a slot is provided on the bottom plate 410, and the bottom of the cold plate 510 is inserted into the slot, which can improve the connection strength between the battery cell assembly 500 and the bottom plate 410 of the box body 400, and is not easy to separate from the box body 400 when subjected to external vibration impact. The impact force can be dispersed to the entire box body 400, so that the force is evenly applied and the cold plate 510 is not easy to deform. At the same time, the cold plate 510 is inserted into the slot, which can reduce the height of the cold plate 510 along the second direction Y, which is beneficial to saving the space of the box body 400 and improving the space utilization rate.

[0161] In some embodiments, the battery device 100 further includes a thermally conductive structural adhesive, which is disposed on the surface of the bottom plate 410 , and the soft-pack battery cells 5301 are bonded to the bottom plate 410 by the thermally conductive structural adhesive.

[0162] In the above technical solution, the battery device 100 includes a thermally conductive structural adhesive arranged on the surface of the bottom plate 410. The soft-pack battery cell 5301 is bonded to the bottom plate 410 through the thermally conductive structural adhesive, which can improve the connection strength between the battery cell group 530 and the box 400 and reduce the risk of displacement and deformation of the soft-pack battery cell 5301. At the same time, the thermally conductive structural adhesive can conduct the heat generated by the soft-pack battery cell 5301 to the bottom plate 410 of the box 400, which is beneficial to reduce the temperature of the soft-pack battery cell 5301 and reduce the risk of thermal runaway.

[0163] like Fig. 9 As shown, in some embodiments, the soft-pack battery cell 5301 includes two first surfaces 532 opposite to each other along a first direction X and two second surfaces 533 opposite to each other along a second direction Y, the surface area of ​​the first surface 532 is greater than that of the second surface 533, and the projection of the cold plate 510 along the first direction X covers the first surface 532.

[0164] The first surface 532 refers to the surface opposite to the soft-pack battery cell 5301 in the thickness direction, and the second surface 533 refers to the surface opposite to the soft-pack battery cell 5301 in the width direction. The first surface 532 is also the surface with the largest surface area of ​​the soft-pack battery cell 5301.

[0165] In the accommodating cavity 520 formed by any two adjacent cold plates 510 , the cold plates 510 cover the first surfaces 532 of the soft-pack battery cells 5301 on both sides along the first direction X and are arranged in close contact with the first surfaces 532 to ensure sufficient heat exchange area for the soft-pack battery cells 5301 .

[0166] In the above technical solution, the soft-pack battery cell 5301 includes two first surfaces 532 opposite to each other along the first direction X and two second surfaces 533 opposite to each other along the second direction Y. The surface area of ​​the first surface 532 is greater than that of the second surface 533. The projection of the cold plate 510 along the first direction X covers the first surface 532. The cold plate 510 covers the first surface 532 of the soft-pack battery cell 5301, which can increase the heat exchange area between the soft-pack battery cell 5301 and the cold plate 510, improve the heat dissipation efficiency of the soft-pack battery cell 5301, and reduce the risk of thermal runaway of the soft-pack battery. At the same time, protection can be provided for the soft-pack battery cell 5301 along the first direction X. When subjected to impact force along the first direction X, the risk of damage and deformation of the soft-pack battery cell 5301 can be reduced, thereby improving the safety of the battery device 100.

[0167] like Fig. 9 As shown, in some embodiments, the first surface 532 and the second surface 533 of any soft-pack battery cell 5301 are connected by a transition portion.

[0168] Since the outer shell of the soft-pack battery cell 5301 is usually an aluminum-plastic film, the outer shell strength is insufficient. In order to reduce the risk of outer shell cracking during molding, the first surface 532 and the second surface 533 need to be connected through a transition portion.

[0169] In the above technical solution, the first surface 532 and the second surface 533 of any soft-pack battery cell 5301 are connected via a transition portion, which can increase the connection strength and reduce the risk of cracking of the shell of the soft-pack battery cell 5301.

[0170] In some embodiments, the transition portion is an R angle.

[0171] In the above technical solution, the transition portion is an R angle, which is conducive to the processing and manufacturing of the shell of the soft-pack battery cell 5301, improves the ability of the shell to resist cracking, and can improve the production efficiency of the soft-pack battery cell 5301.

[0172] like Fig. 9As shown, in some embodiments, a glue blocking structure 540 is provided between the R corners of any two adjacent soft-pack battery cells 5301 located in the same accommodating cavity 520 , and the glue blocking structure 540 is provided at the bottom of the box body 400 .

[0173] Since the soft-pack battery cell 5301 needs to be bonded on one side close to the bottom plate 410, in order to ensure the bonding area and avoid stress concentration in the R corner area after the glue is cured, it is necessary to set a glue blocking structure 540 between the R corners of two adjacent soft-pack battery cells 5301 to reduce the risk of glue overflow and the risk of stress concentration in the R corner area.

[0174] The rubber blocking structure 540 may be a boss disposed at the bottom of the box body 400 , or a rubber blocking strip, etc.

[0175] In the above technical solution, a glue blocking structure 540 is arranged between the R corners of any two adjacent soft-pack battery cells 5301 in the same accommodating cavity 520, which can prevent glue from overflowing to the R corner when the soft-pack battery cell 5301 is bonded to the bottom plate 410 of the box body 400, thereby reducing the risk of stress concentration at the R corner of the soft-pack battery cell 5301.

[0176] In some embodiments, the glue blocking structure 540 is a glue blocking strip.

[0177] In the above technical solution, the glue blocking structure 540 is a glue blocking strip, which can be directly bonded to the bottom plate 410 of the box body 400, and has a simple structure, convenient installation and high reliability.

[0178] In some embodiments, the battery device 100 further includes an expansion beam, which is connected to the bottom plate 410 , and the cold plates 510 on both sides along the first direction X abut against the expansion beam.

[0179] The expansion beam generally abuts against both sides of the cold plate 510 of the battery cell assembly 500 along the thickness direction of the soft-pack battery cell 5301, which can absorb the expansion force of the soft-pack battery cell 5301, reduce the risk of deformation of the cold plate 510, and ensure that the cold plate 510 can maintain contact with the first surface 532 of the soft-pack battery cell 5301 to maintain a good cooling effect. At the same time, it can also reduce the risk of displacement or deformation of the soft-pack battery cell 5301, which may lead to short circuit and leakage.

[0180] In the above technical solution, the battery device 100 also includes an expansion beam, which is connected to the bottom plate 410. The cold plates 510 on both sides along the first direction X abut against the expansion beam, which can reduce the number of components inside the box 400, improve the internal space utilization of the box 400, and accommodate more battery cell assemblies 500, which is beneficial to improving the capacity of the battery device 100. The expansion beam abuts against the cold plate 510 along the first direction X, which can absorb the expansion force of the soft-pack battery cell 5301 and reduce the risk of deformation and damage of the cold plate 510.

[0181] In some embodiments, the soft-pack battery cell 5301 is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

[0182] In this embodiment, the soft-pack battery cell 5301 is any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell. The lithium iron phosphate battery cell has the advantages of high safety, long cycle life, good high temperature performance, etc. The ternary battery cell has the advantages of high energy density, fast charging, etc. The solid-state battery cell has the advantages of high safety, high energy density, long cycle life, etc. For example, the solid-state battery cell can be a sulfide solid-state battery, an oxide solid-state battery or a polymer solid-state battery, a composite solid-state electrolyte battery, a garnet solid-state battery, etc.

[0183] As an optional scheme, in some embodiments, when the soft-pack battery cell 5301 is a lithium iron phosphate battery cell, in the positive electrode material of the soft-pack battery cell 5301, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 1 to 3 parts of the total weight of the positive electrode material (for example, it may include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1 to 3 parts of the total weight of the positive electrode material (for example, it may include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.). Exemplarily, when the soft-pack battery cell 5301 is a lithium iron phosphate battery cell, the positive electrode active material is LFP (which may refer to LiFePO4, i.e., lithium iron phosphate), the binder may be PVDF (polyvinylidene fluoride), and the conductive agent may be conductive carbon black, wherein LFP:PVDF:conductive carbon black may be 96:2:2, that is, the total weight of the positive electrode active material is 100 parts, LFP accounts for 96 parts, PVDF accounts for 2 parts, and conductive carbon black also accounts for 2 parts. The weight unit of the positive electrode active material may be 10 grams. When the soft-pack battery cell 5301 is a ternary battery cell, in the positive electrode material of the battery cell, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 2 to 3 parts of the total weight of the positive electrode material (for example, including but not limited to 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1 to 2 parts of the total weight of the positive electrode material (for example, including but not limited to 1, 1.2, 1.5, 1.8, 2, etc.). Among them, the ternary battery cell can be but not limited to nickel cobalt manganese oxide lithium system, nickel cobalt 15 aluminum oxide lithium system, etc. Exemplarily, the ternary material of the ternary battery cell can be eight-series LiNi0.8Co0.1Mn0.1O2, and the weight ratio of the positive electrode active material, the binder, and the conductive agent is 96:2.5:1.5, that is, the total weight of the positive electrode material is divided into 100 parts, the eight-series LiNi0.8Co0.1Mn0.1O2 accounts for 96 parts, the binder accounts for 2.5 parts, and the conductive agent accounts for 1.5 parts. In the above technical solution, when the soft-pack battery cell 5301 is a lithium iron phosphate battery cell, a high proportion of positive electrode active materials means that more substances capable of electrochemical reactions can be accommodated in a limited electrode assembly, which is beneficial to increasing the capacity and energy density of the battery device 100, so that the lithium iron phosphate battery cell can output higher power while being relatively small in size and weight, thereby meeting application scenarios with certain requirements for energy density. The use of the binder and the conductive agent within the above range can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device 100.When the soft-pack battery cell 5301 is a ternary battery cell, since the structure and surface properties of the ternary material itself are relatively complex, the use of the positive electrode active material, binder, and conductive agent in the above-mentioned dosage ratio is beneficial to ensure good bonding between the positive electrode active material particles and between the active material and the current collector, thereby improving the mechanical stability and integrity of the electrode assembly, and is beneficial to reducing the risk of active material shedding and electrode pulverization during charging and discharging, thereby extending the cycle life of the battery device 100.

[0184] In the above technical solution, the soft-pack battery cell 5301 is set to be any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell, so that the soft-pack battery cell 5301 can be flexibly set to different types of battery cells as needed, thereby making the application scenarios of the soft-pack battery cell 5301 wider, so that the battery device 100 can better meet different usage requirements.

[0185] In a second aspect, the present application provides an electrical device, including the battery device 100 according to the first aspect of the present application.

[0186] In the above-mentioned embodiment, by setting the battery device 100 of the first aspect, the battery device 100 includes a box body 400, which has a bottom plate 410 for carrying a battery cell assembly 500; the battery cell assembly 500 includes a plurality of cold plates 510, a battery cell group 530 and a connector 600 arranged at intervals along a first direction X, and a receiving cavity 520 is formed between any two adjacent cold plates 510, and the battery cell group 530 includes a plurality of soft-pack battery cells 5301, and the plurality of soft-pack battery cells 5301 are dispersedly arranged in a plurality of receiving cavities 520, so that the heat dissipation efficiency of the soft-pack battery cells 5301 can be improved. When a soft-pack battery cell 5301 in a receiving cavity 520 has thermal runaway, due to the separation effect of the cold plate 510, the thermal runaway is not easy to spread to the soft-pack battery cell 5301 in the adjacent receiving cavity 520, which is conducive to reducing the risk of heat diffusion. At the same time, the plurality of cold plates 51 arranged along the first direction X 0, which can improve the structural strength of the battery cell assembly 500 and reduce the risk of deformation of the soft-pack battery cell 5301 when subjected to external force impact; the soft-pack battery cell 5301 is bonded to the bottom plate 410 of the box body 400, which can improve the position stability of the battery cell group 530, and is not easy to be displaced when subjected to external vibration impact, which is beneficial to improving the main frequency of the battery device 100; the connector 600 connects multiple cold plates 510 into a whole, which can improve the structural strength of the battery cell assembly 500, and at the same time prevent the soft-pack battery cell 5301 from moving along the second direction Y, which is beneficial to maintaining the structural stability of the battery cell assembly 500. In addition, the cold plate 510 can also disperse external impact force, reduce the probability of a single soft-pack battery cell 5301 being subjected to excessive impact force, and improve the service life of the soft-pack battery cell 5301, and improve the service life of the battery device 100, thereby improving the overall performance of the electrical device.

[0187] In some embodiments, the electrical device includes a vehicle, the vehicle includes a floor, the box 400 includes an opening 420 , and the floor covers the opening 420 .

[0188] In the above technical solution, the electrical device includes a vehicle, the vehicle includes a floor, the box body 400 includes an opening 420, and the floor cover is closed on the opening 420. The box body 400 of the battery device 100 uses the floor of the vehicle itself as a box cover for sealing, which can reduce costs and improve space utilization, increase the capacity of the box body 400, and at the same time improve the height of the vehicle chassis.

[0189] The following will refer to Figure 3-Figure 8 A battery device 100 according to a specific embodiment of the present application is described.

[0190] The battery device 100 includes: a box body 400, having a bottom plate 410 for carrying a battery cell assembly 500; a battery cell assembly 500, including: a plurality of cold plates 510, arranged at intervals along a first direction X, forming a receiving cavity 520 between any two adjacent cold plates 510, and a battery cell group 530, including a plurality of soft-pack battery cells 5301, the plurality of soft-pack battery cells 5301 are dispersedly arranged in the plurality of receiving cavities 520, each receiving cavity 520 has at least one soft-pack battery cell 5301, and the soft-pack battery cell 5301 is bonded to the bottom plate 410, and a connector 600, connecting the plurality of cold plates 510, so that the plurality of cold plates 510 are connected as a whole, and restricting the movement of the battery cell group 530 along the second direction Y.

[0191] The connector 600 is in a flat plate shape and covers one side of the battery cell group 530 along the second direction Y. The connector 600 may be integrally formed with the cold plate 510 or may be separately provided with the cold plate 510 and then connected into one.

[0192] The connecting member 600 includes a plurality of connecting plates 610 . A connecting plate 610 is connected between any two adjacent cold plates 510 . The plurality of connecting plates 610 are arranged in one-to-one correspondence with the plurality of accommodating cavities 520 .

[0193] Each connecting plate 610 is L-shaped, including a first plate 6101 and a second plate 6102 connected to each other. Among any two adjacent cold plates 510, the first plate 6101 is connected to one cold plate 510 and covers the side of the soft-pack battery cell 5301 in the corresponding accommodating cavity 520 along the second direction Y, and the second plate 6102 is connected to the other cold plate 510 and covers the side of the soft-pack battery cell 5301 in the corresponding accommodating cavity 520 along the first direction X.

[0194] The connecting member 600 is provided with a pressure relief zone 700, which can be specifically a through hole arranged on the first plate 6101. Each accommodating cavity 520 is correspondingly provided with a plurality of spaced pressure relief zones 700, and the pressure relief zones 700 corresponding to any two adjacent accommodating cavities 520 along the first direction X are staggered along the third direction.

[0195] The bottom plate 410 of the box body 400 is provided with a slot, the cold plate 510 is plugged into the bottom plate 410 of the box body 400, the soft-pack battery cell 5301 is bonded to the bottom plate 410 by a thermally conductive structural adhesive, and in the same accommodating cavity 520, a blocking strip is provided between the R corners of any two adjacent soft-pack battery cells 5301, and the blocking strip is bonded to the bottom plate 410.

[0196] The battery device 100 further includes expansion beams disposed on both sides of the battery cell assembly 500 along the first direction X, and the cold plates 510 on both sides of the battery cell assembly 500 along the first direction X abut against the expansion beams.

[0197] In the battery device 100 of the above embodiment, the battery cell group 530 includes a plurality of soft-pack battery cells 5301, and the plurality of soft-pack battery cells 5301 are dispersedly arranged in a plurality of accommodating cavities 520, so that the heat dissipation efficiency of the soft-pack battery cells 5301 can be improved. When a soft-pack battery cell 5301 in an accommodating cavity 520 has thermal runaway, due to the separation effect of the cold plate 510, the thermal runaway is not easy to spread to the soft-pack battery cell 5301 in the adjacent accommodating cavity 520, which is conducive to reducing the risk of heat diffusion. At the same time, the plurality of cold plates 510 arranged along the first direction X can improve the heat dissipation of the battery cell assembly 500. The structural strength of the soft-pack battery cell 5301 can be improved, and the risk of deformation of the soft-pack battery cell 5301 can be reduced when subjected to external force impact; the soft-pack battery cell 5301 is bonded to the bottom plate 410 of the box body 400, which can improve the position stability of the battery cell group 530, and is not easy to be displaced when subjected to external vibration impact, which is beneficial to improving the main frequency of the battery device 100; the connector 600 connects multiple cold plates 510 into a whole, which can improve the structural strength of the battery cell assembly 500, and at the same time can prevent the soft-pack battery cell 5301 from moving along the second direction Y, which is beneficial to maintaining the structural stability of the battery cell assembly 500.

[0198] 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 box body having a bottom plate for carrying a battery cell assembly; The battery cell assembly comprises: a plurality of cold plates arranged at intervals along a first direction, wherein a receiving cavity is formed between any two adjacent cold plates, and A battery cell group, comprising a plurality of soft-pack battery cells, wherein the plurality of soft-pack battery cells are dispersedly arranged in a plurality of the accommodating cavities, each of the accommodating cavities has at least one soft-pack battery cell, and the soft-pack battery cells are bonded to the bottom plate, and A connector is used to connect the plurality of cold plates so as to connect the plurality of cold plates as a whole and restrict the movement of the battery cell group along a second direction, wherein the first direction and the second direction intersect.

2. The battery device according to claim 1, characterized in that: The connector cover is disposed on one side of the battery cell group along the second direction and cooperates with the plurality of cold plates.

3. The battery device according to claim 2, characterized in that: The connecting piece is in the shape of a flat plate.

4. The battery device according to claim 3, characterized in that: The connecting member is integrally formed with the plurality of cold plates.

5. The battery device according to claim 1, characterized in that: The connecting member includes a plurality of connecting plates, and one connecting plate is connected between any two adjacent cold plates.

6. The battery device according to claim 5, characterized in that: The connecting plate is in a flat plate shape and covers one side of the soft-pack battery cell in the corresponding accommodating cavity along the second direction.

7. The battery device according to claim 6, characterized in that: The connecting plate is integrally formed with any two adjacent cold plates.

8. The battery device according to claim 5, characterized in that: The connecting plate includes a first plate and a second plate; Among any two adjacent cold plates, the first plate is connected to one of the cold plates and covers one side of the soft-pack battery cell in the corresponding accommodating cavity along the second direction, and the second plate is connected to the other cold plate, covers one side of the soft-pack battery cell in the corresponding accommodating cavity along the first direction, and is connected to the first plate at an angle.

9. The battery device according to claim 8, characterized in that: The first plate is integrally formed with one of the cold plates, and / or the second plate is integrally formed with another of the cold plates.

10. The battery device according to any one of claims 1 to 9, characterized in that: The connector is provided with a pressure relief area, and the pressure relief area is used to release the internal pressure of the soft-pack battery cell.

11. The battery device according to claim 10, characterized in that: The pressure relief area includes at least one of a weak portion, a notch, a through hole, and a gap.

12. The battery device according to claim 10, characterized in that: The pressure relief area is arranged corresponding to a part of the battery cell group on one side along the second direction; Each of the accommodating chambers is correspondingly provided with at least one pressure relief zone.

13. The battery device according to claim 12, characterized in that: Each of the accommodating chambers is correspondingly provided with a plurality of the pressure relief areas, and the plurality of the pressure relief areas are arranged at intervals.

14. The battery device according to claim 12, characterized in that: Each of the accommodating chambers comprises a first area and a second area which are sequentially arranged along a third direction and are connected to each other; In any two adjacent accommodating chambers, the first area of ​​one accommodating chamber is correspondingly provided with the pressure relief area, and the second area of ​​the other accommodating chamber is correspondingly provided with the pressure relief area.

15. The battery device according to claim 8, characterized in that: The dimension of the first plate along the third direction is L1, the dimension of the soft-pack battery cell along the third direction is L2, and 1 / 2≤L1 / L2<1.

16. The battery device according to any one of claims 1 to 9, characterized in that: The material of the connecting piece is metal or plastic.

17. The battery device according to any one of claims 1 to 9, characterized in that: The bottom plate is provided with a slot, and the bottom of the cold plate is plugged into the slot.

18. The battery device according to any one of claims 1 to 9, characterized in that: It also includes a heat-conducting structural adhesive, which is arranged on the surface of the bottom plate, and the soft-pack battery cell is bonded to the bottom plate through the heat-conducting structural adhesive.

19. The battery device according to any one of claims 1 to 9, characterized in that: The soft-pack battery cell includes two first surfaces opposite to each other along the first direction and two second surfaces opposite to each other along the second direction. The surface area of ​​the first surface is larger than that of the second surface. The projection of the cold plate along the first direction covers the first surface.

20. The battery device according to claim 19, characterized in that The first surface and the second surface of any one of the soft-pack battery cells are connected via a transition portion.

21. The battery device according to claim 20, characterized in that The transition portion is an R angle.

22. The battery device according to claim 21, characterized in that A glue blocking structure is provided between the R corners of any two adjacent soft-pack battery cells located in the same accommodating cavity, and the glue blocking structure is connected to the bottom of the box body.

23. The battery device according to claim 22, characterized in that The glue blocking structure is a glue blocking strip.

24. The battery device according to any one of claims 1 to 9, characterized in that: The battery device further includes an expansion beam, the expansion beam is connected to the bottom plate, and the cold plates at both sides along the first direction abut against the expansion beam.

25. The battery device according to any one of claims 1 to 9, characterized in that: The soft-pack battery cell is any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell.

26. An electrical device, characterized in that: Comprising a battery device as claimed in any one of claims 1 to 25.

27. The electrical device according to claim 26, characterized in that: The electric device comprises a vehicle, the vehicle comprises a floor, the box comprises an opening, and the floor covers the opening.

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