Battery device and electric device

Abstract

A battery device and an electric device. The battery device comprises: a battery cell assembly, which comprises a plurality of cold plates arranged at intervals in a first direction, wherein an accommodating cavity is formed between any two adjacent cold plates; and a battery cell group, which comprises a plurality of pouch battery cells separately arranged in the plurality of accommodating cavities; and connectors, which connect the plurality of cold plates, such that the plurality of cold plates are connected integrally, and the movement of the battery cell group in a second direction is limited. In the above technical solution, the plurality of cold plates arranged in the first direction can improve the heat dissipation efficiency of the pouch battery cells, increase the heat exchange area, and help reduce the risk of thermal runaway.

Description

Battery devices and electrical appliances Technical Field

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

[0002] Currently, most new energy vehicles use power batteries as energy storage and power devices, and power batteries are also found in other types of vehicles. The reliability of power batteries has a significant impact on the vehicle's range and power performance. Therefore, improving battery reliability is a direction that needs to be focused on in the continuous improvement and innovation of batteries. Summary of the Invention

[0003] This application aims to solve one of the technical problems existing in the prior art. To this end, this application proposes a battery device and an electrical device including the battery device. The battery device includes a battery cell assembly, which includes a liquid cooling plate, connectors, and a battery cell group. This can improve the heat dissipation efficiency of the pouch battery cells and reduce the risk of thermal runaway in the pouch battery cells, thereby improving the reliability of the battery device.

[0004] In a first aspect, embodiments of this application provide a battery device, comprising: a housing having a base plate for supporting a battery cell assembly; the battery cell assembly comprising: a plurality of cold plates spaced apart along a first direction, with a receiving cavity formed between any two adjacent cold plates; and a battery cell group comprising a plurality of pouch battery cells dispersedly disposed within the plurality of receiving cavities, each receiving cavity having at least one pouch battery cell, the pouch battery cells being adhered to the base plate; and a connector connecting the plurality of cold plates to connect the plurality of cold plates into a whole and restricting the movement of the battery cell group along a second direction, wherein the first direction and the second direction intersect.

[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 multiple pouch battery cells, which are dispersed in multiple receiving cavities. Compared with the solution where the cold plates are set at the bottom of the pouch battery cells, the heat exchange area can be increased, thereby improving the heat dissipation efficiency of the pouch battery cells. At the same time, when a pouch battery cell in one receiving cavity experiences thermal runaway, the separation effect of the cold plates makes it difficult for the thermal runaway to spread to pouch battery cells in adjacent receiving cavities, which helps to reduce the risk of thermal diffusion and improves 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 reduce the risk of deformation of the pouch battery cell when subjected to external impact. The pouch battery cell is bonded to the bottom plate of the casing, which can improve the positional stability of the battery cell assembly. It is not easy to displace when subjected to external vibration and impact, which is conducive to improving the main frequency of the battery device. The connectors connect the multiple cold plates into a whole, which can improve the structural strength of the battery cell assembly and prevent the pouch battery cell from moving along the second direction, which is conducive to maintaining the structural stability of the battery cell assembly.

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

[0008] In the above technical solution, the connector is covered on one side of the battery cell assembly along the second direction, which can protect the soft-pack battery cell, reduce the risk of foreign objects entering the cavity and causing damage or short circuit to the soft-pack battery cell, and at the same time 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 connector is flat.

[0010] In the above technical solution, the connector is flat, with a simple structure and high manufacturing efficiency, which helps to reduce costs and improve the assembly efficiency of battery cells.

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

[0012] In the above technical solution, the connector is integrally formed with multiple cold plates, which helps to reduce component errors, improve structural consistency, increase production efficiency, and reduce production costs during production and processing.

[0013] In some embodiments, the connector includes multiple connecting plates, with one connecting plate connecting any two adjacent cold plates.

[0014] In the above technical solution, the connector includes multiple connecting plates, which are arranged one-to-one with multiple receiving 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 receiving cavity, thereby selecting a connecting plate of appropriate size, making the installation method of battery cell assembly more flexible and applicable to more diverse scenarios.

[0015] In some embodiments, the connecting plate is flat and covers one side of the pouch cell in the corresponding receiving cavity along the second direction.

[0016] In the above technical solution, the connecting plate is flat and covers one side of the soft-pack battery cell in the corresponding receiving cavity along the second direction, which can reduce the risk of foreign objects falling into the receiving 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. During production and processing, this helps to reduce the number of parts, reduce the matching error between parts, reduce the processing difficulty, improve structural consistency, increase production efficiency, and reduce production costs.

[0019] In some embodiments, the connecting plate includes a first plate and a second plate. In 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 receiving cavity along the second direction. The second plate is connected to the other cold plate, covers one side of the soft-pack battery cell in the corresponding receiving 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 corresponding soft-pack battery cell in the receiving cavity along the second direction, and the second plate covers one side of the corresponding soft-pack battery cell in the receiving 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 foreign objects entering the receiving 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 full contact between the soft-pack battery cell and the cold plate, and help improve heat dissipation efficiency.

[0021] In some embodiments, the first plate is integrally formed with a 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. During production and processing, this helps to reduce the number of parts, reduce the difficulty of production and processing, reduce the fit error between parts, improve structural consistency, increase production efficiency, and reduce production costs.

[0023] In some embodiments, the dimension of the first plate along the third direction is L1, and the dimension of the soft-pack battery cell along the third direction is L2, where 1 / 2 ≤ L1 / L2 < 1.

[0024] In the above technical solution, the connector includes a first plate covering one side of the soft-pack battery cell in the corresponding receiving cavity along the second direction. The size of the first plate along the third direction is greater than half 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 soft-pack battery cell along the second direction, which can realize directional pressure relief. At the same time, it can also ensure that there is a sufficiently large coverage area of ​​the soft-pack battery cell along the second direction, reduce the risk of the soft-pack battery cell moving along the second direction, and reduce the weight of the connector, save materials, and reduce costs.

[0025] In some embodiments, the connector is provided with a pressure relief area for releasing the internal pressure of the pouch battery cell.

[0026] In the above technical solution, since the connector is provided with a pressure relief area, the pressure relief area can release the excessive pressure in the cavity in time, reduce the risk of explosion or rupture due to excessive pressure in the cavity, and help improve the structural stability of the battery cell assembly.

[0027] In some embodiments, the pressure relief zone includes at least one of a weak portion, a notch, a through hole, and a gap.

[0028] In the above technical solution, the pressure relief zone includes at least one of the following: weak part, groove, through hole, and notch. 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.

[0029] In some embodiments, the pressure relief area is partially corresponding to one side of the battery cell pack along the second direction; each receiving cavity is provided with at least one pressure relief area.

[0030] In the above technical solution, the pressure relief area is locally corresponding to one side of the battery cell group along the second direction. When the pouch battery cell experiences thermal runaway, it can ensure directional pressure relief from the second direction, reducing the risk of thermal runaway spreading to adjacent cavities, and also reducing the risk of short circuit in the battery cell group. Each cavity is provided with at least one pressure relief area. When the pouch battery cell experiences thermal runaway, the pressure relief area of ​​the corresponding cavity can release the pressure in the cavity in a timely manner, shortening the reaction time and reducing the risk of cavity explosion or rupture.

[0031] In some embodiments, each receiving cavity is provided with multiple pressure relief zones, which are spaced apart.

[0032] In the above technical solution, each containment cavity is provided with multiple pressure relief zones. These multiple pressure relief zones are spaced apart, resulting in a larger pressure relief area and faster pressure relief. This can further reduce the risk of containment cavity explosion or rupture, and is beneficial to improving the safety and stability of the battery device.

[0033] In some embodiments, each receiving cavity includes a first region and a second region arranged sequentially along a third direction and communicating with each other; in any two adjacent receiving cavities, the first region of one receiving cavity is provided with a pressure relief area, and the second region of the other receiving cavity is provided with a pressure relief area.

[0034] In the above technical solution, each receiving cavity includes a first region and a second region that are interconnected along a third direction. In any two adjacent receiving cavities, the first region of one receiving cavity is provided with a pressure relief area, and the second region of the other receiving cavity is provided with a pressure relief area. The pressure relief areas of adjacent receiving cavities are set in different regions along the third direction, which can ensure that the structure of the connector is more stable and reduce the risk of connector deformation. At the same time, since the pressure relief areas of adjacent receiving cavities are set in different regions along the third direction, when a soft-pack battery cell in one receiving cavity experiences thermal runaway, the emitted high-temperature and high-pressure substances will be blocked by the corresponding connectors of adjacent receiving cavities, reducing the risk of thermal diffusion and improving the safety of the battery device.

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

[0036] In the above technical solution, the connector is made of 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 base plate is provided with a slot, and the bottom of the cold plate is inserted into the slot.

[0038] In the above technical solution, the bottom plate is provided with a slot, and the bottom of the cold plate is inserted into the slot. This can improve the connection strength between the battery cell assembly and the bottom plate of the box. When subjected to external vibration and impact, it is not easy to separate from the box. The impact force can be distributed to the entire box, making the force uniform and the cold plate less prone to deformation. 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 helps to save box space and improve space utilization.

[0039] In some embodiments, the battery device further includes a thermally conductive structural adhesive disposed on the surface of a base plate, wherein the pouch cell is bonded to the base plate by the thermally conductive structural adhesive.

[0040] In the above technical solution, the battery device includes a thermally conductive structural adhesive disposed on the surface of the base plate. The soft-pack battery cells are bonded to the base plate through the thermally conductive structural adhesive, which can improve the connection strength between the battery cell group and the housing 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 base plate of the housing, which helps to reduce the temperature of the soft-pack battery cells and reduce the risk of thermal runaway.

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

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

[0043] In some embodiments, the first and second surfaces of any pouch cell are connected by a transition portion.

[0044] In the above technical solution, the first and second surfaces of any pouch cell are connected by a transition portion, which can increase the connection strength and reduce the risk of cracking of the pouch cell casing.

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

[0046] In the above technical solution, the transition part is an R-angle, which is beneficial to the processing and manufacturing of the soft-pack battery cell shell, improves the shell's crack resistance, and can improve the production efficiency of the soft-pack battery cell.

[0047] In some embodiments, a baffle structure is provided between the R-angles of any two adjacent pouch cell cells located in the same receiving cavity, and the baffle structure is provided at the bottom of the housing.

[0048] In the above technical solution, a baffle structure is provided between the R-corners of any two adjacent soft-pack battery cells in the same housing cavity. This can prevent glue from overflowing to the R-corners when the soft-pack battery cells are bonded to the housing, thereby reducing the risk of stress concentration at the R-corners of the soft-pack battery cells.

[0049] In some embodiments, the adhesive-blocking structure is an adhesive-blocking strip.

[0050] In the above technical solution, the adhesive-blocking structure is an adhesive-blocking strip, which can be directly glued to the bottom of the box. It has a simple structure, is easy to install, and has high reliability.

[0051] In some embodiments, the battery device further includes an expansion beam connected to the base plate, with cold plates on both sides along a first direction abutting against the expansion beam.

[0052] In the above technical solution, the battery device also includes an expansion beam connected to the base plate. Cold plates on both sides along the first direction abut against the expansion beam, which can reduce the number of internal components of the box, improve the utilization rate of the internal space of the box, accommodate more battery cell components, and help increase the capacity of the battery device. In addition, the expansion beam and the cold plates abut against each other along the first direction, which can absorb the expansion force of the soft-pack battery cells and reduce the risk of deformation and damage of the cold plates.

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

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

[0055] In some embodiments, the soft-pack battery cell is a lithium iron phosphate battery cell, and the ratio of the amount of positive active material, binder and conductive agent in the positive electrode material of the soft-pack battery cell is 96:(1-3):(1-3); the soft-pack battery cell is a ternary battery cell, and the ratio of the amount of the amount of positive active material, binder and conductive agent in the positive electrode material of the soft-pack battery cell is 96:(2-3):(1-2).

[0056] In the above technical solutions, when the pouch battery cell is a lithium iron phosphate battery cell, a high proportion of positive electrode active material means that more substances capable of electrochemical reactions can be accommodated within a limited electrode assembly. This is beneficial for increasing the capacity and energy density of the battery device, allowing the lithium iron phosphate battery cell to output higher power while maintaining a relatively small volume and weight, meeting the application scenarios with certain energy density requirements. Using the above-mentioned range for binder and conductive agent dosages can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device. When the pouch battery cell is a ternary lithium battery cell, due to the relatively complex structure and surface properties of ternary materials, using the above-mentioned proportions of positive electrode active material, binder, and conductive agent helps ensure good adhesion between positive electrode active material particles and between the active material and the current collector. This improves the mechanical stability and integrity of the electrode assembly, reduces the risk of active material detachment and electrode pulverization during charging and discharging, and extends the cycle life of the battery device.

[0057] Secondly, this application provides an electrical device, including a battery device according to the first aspect of this application.

[0058] In the above embodiments, by setting up the battery device of the first aspect, since a receiving cavity is formed between any two adjacent cold plates, and the battery cell group includes multiple pouch battery cells, the multiple pouch battery cells are dispersedly arranged in multiple receiving cavities, which can improve the heat dissipation efficiency of the pouch battery cells. When a pouch battery cell in one receiving cavity experiences thermal runaway, due to the separation effect of the cold plates, the thermal runaway is less likely to spread to pouch battery cells in adjacent receiving cavities, which helps to reduce the risk of thermal diffusion. At the same time, the multiple cold plates arranged along the first direction can improve the structural strength of the battery cell assembly, and reduce the deformation risk of the pouch battery cells when subjected to external impact. The soft-pack battery cells are bonded to the bottom plate of the casing, which improves the positional stability of the battery cell assembly. They are less prone to displacement when subjected to external vibration and impact, which is beneficial for increasing the main frequency of the battery device. The connectors link multiple cold plates into a whole, which can improve the structural strength of the battery cell assembly and prevent the soft-pack battery cells from moving along the second direction, which is beneficial for maintaining the structural stability of the battery cell assembly. In addition, the cold plates inserted into the casing can also disperse external impact forces, reduce the probability of a single soft-pack battery cell being subjected to excessive impact forces, and improve the service life of the soft-pack battery cells and the service life of the battery device, thereby improving the overall performance of the electrical device.

[0059] In some embodiments, the electrical device includes a vehicle, the vehicle includes a floor, the housing includes an opening, and the floor covers the opening.

[0060] In the above technical solution, the electrical device includes a vehicle, the vehicle includes a floor, the box includes an opening, the floor covers the opening, and the battery device box uses the vehicle's own floor as a box cover for sealing, which can reduce costs, improve space utilization, increase the box capacity, and increase the vehicle chassis height.

[0061] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0062] Figure 1 is a structural schematic diagram of a vehicle according to an embodiment of this application;

[0063] Figure 2 is a schematic diagram of the structure of a battery device according to an embodiment of this application;

[0064] Figure 3 is an isometric view of a battery cell assembly according to some embodiments of this application;

[0065] Figure 4 is an isometric view of a battery cell assembly according to some other embodiments of this application;

[0066] Figure 5 is a side view of a battery cell assembly according to some embodiments of this application;

[0067] Figure 6 is a side view of a battery cell assembly according to some other embodiments of this application;

[0068] Figure 7 is a side view of a battery cell assembly according to some other embodiments of this application;

[0069] Figure 8 is a top view of a battery cell assembly according to some embodiments shown in Figure 4;

[0070] Figure 9 is a partial enlarged view of a battery cell assembly according to some embodiments shown in Figure 3.

[0071] Reference numerals: 1. Electrical device; 100. Battery device; 200. Controller; 300. Motor; 400. Housing; 410. Base plate; 500. Battery cell assembly; 510. Cold plate; 520. Receiving 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 region; 720. Second region; 532. First surface; 533. Second surface; 420. Opening; 540. Adhesive-blocking structure. Detailed Implementation

[0072] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0073] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0074] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0075] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0076] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0077] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0078] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0079] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0080] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include one or more battery cells, and when there are multiple battery cells, they are connected in series, parallel, or mixed connections via a busbar.

[0081] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0082] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0083] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0084] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0085] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0086] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0087] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0088] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0089] The battery cells mentioned in the embodiments of this 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., and the embodiments of this application are not limited to these. Battery cells may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these shapes either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these types either.

[0090] For example, a single battery cell typically includes a housing, a cell assembly, and an electrolyte. The housing is used to house the cell assembly and the electrolyte, and the housing has at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive electrode sheets, negative electrode sheets, and separators.

[0091] The positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and form an electrical connection with the positive electrode post. For example, the multiple stacked positive electrode tabs can be directly soldered to the positive electrode post to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter piece. The multiple stacked positive electrode tabs are soldered to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece is soldered to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0092] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the battery cell assembly may also include a negative electrode adapter piece. The stacked negative electrode tabs are welded to one end of the negative electrode adapter piece, and the other end of the negative electrode adapter piece is welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0093] Meanwhile, individual battery cells primarily function by the movement of metal ions between the positive and negative electrode plates. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, and the positive electrode active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon or silicon, etc. During charging and discharging, Li+ ions repeatedly insert and extract between the two electrodes: during charging, Li+ ions extract from the positive electrode, pass through the electrolyte, and insert into the negative electrode, leaving the negative electrode in a lithium-rich state; the reverse occurs during discharging.

[0094] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery packs and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0095] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Among them, battery devices, as core components of new energy vehicles, have high requirements in terms of both energy density and reliability.

[0096] Because the soft-pack battery cells use an aluminum-plastic film to wrap the electrode components and electrolyte, the aluminum-plastic film is lightweight, which can significantly reduce the weight of the battery device and increase the energy density of the battery device.

[0097] However, in battery devices using related technologies, when using pouch cell batteries, the low strength of the aluminum-plastic film means that when multiple pouch cell batteries are arranged inside the housing, the pouch cell batteries inside the housing are prone to thermal runaway due to low heat dissipation efficiency. Furthermore, the low structural strength of the aluminum-plastic film makes the pouch cell batteries prone to deformation, which can easily lead to short circuits when subjected to external impacts.

[0098] Based on the above considerations, in order to improve the heat dissipation efficiency of the pouch battery cells, reduce the risk of thermal runaway, and reduce the mutual compression between the pouch battery cells, this application designs a battery device. The battery device includes a battery cell assembly, which includes: multiple cold plates, a battery cell group, and a connector. The multiple cold plates are spaced apart along the thickness direction of the pouch battery cells, and a receiving cavity is formed between any two adjacent cold plates. The battery cell group includes multiple pouch battery cells, which are dispersed in the multiple receiving cavities. Each receiving cavity has at least one pouch battery cell, which can improve the heat dissipation efficiency of the pouch battery cells and enhance their impact resistance. The pouch battery cells are bonded to the base plate, which can improve the positional stability of the pouch battery cells, reduce the probability of displacement, and reduce the risk of short circuits. The connector connects the multiple cold plates to form a whole and restricts the movement of the battery cell group along the width direction of the pouch battery cells, which is beneficial to improving the structural strength of the battery cell assembly.

[0099] This application provides an electrical device that uses the battery pack or battery device disclosed herein as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0100] For ease of explanation, the following embodiments use a vehicle as an example to describe the structure of the electrical device 1, battery device 100, and battery cell assembly 500 of this application.

[0101] Please refer to Figure 1, which is a schematic diagram of the structure of an electrical device 1 as a vehicle according to some embodiments of this application. The vehicle can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle is equipped with a battery device 100, which can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to supply power to the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle during starting, navigation, and driving. In some embodiments of this application, the battery device 100 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0102] Please refer to Figure 2, which is a schematic diagram of the structure of a battery device 100 provided in some embodiments of this application. The battery device includes a housing 400 and a battery cell assembly 500. The housing 400 provides assembly space for the battery cell assembly 500, and the battery cell assembly 500 is housed within the housing 400.

[0103] The battery device 100 according to an embodiment of the first aspect of this application is described below with reference to Figures 3-8. Figure 3 is an isometric view of a battery cell assembly 500 according to some embodiments of this application; Figure 4 is an isometric view of a battery cell assembly 500 according to other embodiments of this application; Figure 5 is a side view of a battery cell assembly 500 according to some embodiments of this application; Figure 6 is a side view of a battery cell assembly 500 according to some other embodiments of this application; Figure 7 is a side view of a battery cell assembly 500 according to yet another embodiment of this application; Figure 8 is a top view of a battery cell assembly 500 according to some embodiments shown in Figure 4. Figure 9 is a partially enlarged view of a battery cell assembly 500 according to some embodiments shown in Figure 3.

[0104] This application provides a battery device 100, as shown in Figures 3-5. The battery device 100 includes: a housing 400 with a base plate 410 for supporting a battery cell assembly 500; the battery cell assembly 500 includes: a plurality of cold plates 510 spaced apart along a first direction X, with a receiving cavity 520 formed between any two adjacent cold plates 510; and a battery cell group 530 including a plurality of pouch battery cells 5301, the plurality of pouch battery cells 5301 being dispersedly disposed in the plurality of receiving cavities 520, each receiving cavity 520 having at least one pouch battery cell 5301, the pouch battery cells 5301 being bonded to the base 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, where the first direction X and the second direction Y intersect.

[0105] In some embodiments, the pouch cell 5301 includes a membrane shell and an electrode assembly and an electrolyte enclosed within the membrane shell, wherein the membrane shell may be an aluminum-plastic membrane, and the electrode assembly includes a positive electrode, a negative electrode, and a separator arranged in layers.

[0106] 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.

[0107] The interior of the cold plate 510 has a flow channel for containing the cooling medium. 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.

[0108] The number of pouch battery cells 5301 in the battery cell pack 530 is not less than two. For example, the battery cell pack 530 may include two, four, five, seven, eight, ten, fifteen, twenty, thirty or more pouch battery cells 5301.

[0109] A receiving cavity 520 is formed between any two adjacent cold plates 510 along the first direction X. The receiving cavity 520 is used to accommodate the soft-pack battery cell 5301. The number of soft-pack battery cells 5301 in each receiving cavity 520 can be the same or different.

[0110] The receiving cavity 520 has openings on both sides along the second direction Y. The side of the soft-pack battery cell 5301 closest to the bottom plate 410 is bonded to the bottom plate 410 of the housing 400 through the bottom opening of the receiving cavity 520. The top opening of the side of the receiving cavity 520 away from the bottom plate 410 is covered by 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 restrict the movement of the battery cell group 530 along the second direction Y.

[0111] In the above technical solution, since a receiving cavity 520 is formed between any two adjacent cold plates 510, and the battery cell assembly 530 includes multiple pouch battery cells 5301, the multiple pouch battery cells 5301 are dispersedly arranged in multiple receiving cavities 520, which can improve the heat dissipation efficiency of the pouch battery cells 5301. When a pouch battery cell 5301 in one receiving cavity 520 experiences thermal runaway, due to the separating effect of the cold plates 510, the thermal runaway is less likely to spread to pouch battery cells 5301 in adjacent receiving cavities 520, which helps to reduce the risk of thermal diffusion. At the same time, the multiple cold plates 510 arranged along the first direction X can improve the battery cell assembly 500. The structural strength reduces the risk of deformation of the pouch battery cell 5301 when subjected to external impact. The pouch battery cell 5301 is bonded to the bottom plate 410 of the housing 400, which improves the positional stability of the battery cell assembly 530. It is less prone to displacement when subjected to external vibration and 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. At the same time, it can also prevent the pouch 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.

[0112] In some embodiments of this application, the connector 600 is disposed on one side of the battery cell assembly 530 along the second direction Y and cooperates with a plurality of cold plates 510.

[0113] 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 multiple cold plates 510 by means of bolts, snap-fit, riveting, welding or adhesive to form a whole.

[0114] In the above technical solution, the connector 600 is covered on one side of the battery cell assembly 530 along the second direction Y, which can protect the soft-pack battery cell 5301, reduce the risk of foreign objects entering the receiving cavity 520 and causing damage or short circuit to the soft-pack battery cell 5301, and at the same time 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.

[0115] In some embodiments, the connector 600 is flat.

[0116] In the above technical solution, the connector 600 is flat, with a simple structure and high manufacturing efficiency, which helps to reduce costs and improve the assembly efficiency of the battery cell module 500.

[0117] In some embodiments, the connector 600 is integrally formed with a plurality of cold plates 510.

[0118] In the above technical solution, the connector 600 and multiple cold plates 510 are integrally formed, which helps to reduce component errors, improve structural consistency, increase production efficiency, and reduce production costs during production and processing.

[0119] In some embodiments, the connector 600 includes a plurality of connecting plates 610, with a connecting plate 610 connecting any two adjacent cold plates 510.

[0120] The connector 600 includes multiple independent connecting plates 610, which are arranged one-to-one with multiple receiving cavities 520. The connecting plates 610 and the cold plates 510 forming the corresponding receiving cavities 520 can be integrally formed or separately connected.

[0121] In the above technical solution, the connector 600 includes multiple connecting plates 610, which are arranged one-to-one with multiple receiving 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 receiving cavity 520, thereby selecting a connecting plate 610 of appropriate size, making the installation method of the battery cell assembly 500 more flexible and applicable to more diverse scenarios.

[0122] In some embodiments, the connecting plate 610 is flat and covers one side of the soft-pack battery cell 5301 in the corresponding receiving cavity 520 along the second direction Y.

[0123] In the above technical solution, the connecting plate 610 is flat and covers the soft-pack battery cell 5301 in the corresponding receiving cavity 520 on one side along the second direction Y, which can reduce the risk of foreign objects falling into the receiving cavity 520 and reduce the possibility of damage or short circuit of the soft-pack battery cell 5301.

[0124] In some embodiments, the connecting plate 610 is integrally formed with any two adjacent cold plates 510.

[0125] In the above technical solution, the connecting plate 610 is integrally formed with any two adjacent cold plates 510. During production and processing, this helps to reduce the number of parts, reduce the matching error between parts, reduce the processing difficulty, improve structural consistency, increase production efficiency, and reduce production costs.

[0126] In some embodiments, the connecting plate 610 includes a first plate 6101 and a second plate 6102. In 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 receiving cavity 520 along the second direction Y. The second plate 6102 is connected to the other cold plate 510 and covers the soft-pack battery cell 5301 in the corresponding receiving cavity 520 along the first direction X, and is connected to the first plate 6101 at an angle.

[0127] 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 and covers the soft-pack battery cell 5301 in the corresponding receiving cavity 520 along the second direction Y. The second plate 6102 extends along the second direction Y and covers the soft-pack battery cell 5301 in the corresponding receiving cavity 520 along the first direction X.

[0128] The first plate 6101 and the second plate 6102 are respectively connected to the two corresponding cold plates 510 forming the receiving cavity 520, wherein the second plate 6102 is fitted to the cold plate 510.

[0129] 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 receiving 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 receiving cavity 520 along the first direction X. When assembling the soft-pack battery cell 5301, there is no need to deform the connecting plate 610, which can improve the installation accuracy of the battery cell assembly 500. After the individual cell 5301 is installed, the risk of foreign objects entering the receiving cavity 520 can be reduced. At the same time, the heat from multiple pouch battery cells 5301 can be directly transferred to one side of the cold plate 510, and can also be indirectly transferred to the other side of the cold plate 510 through the second plate 6102. The first plate 6101 and the second plate 6102 are respectively connected to the cold plate 510, which makes the structure of the battery cell assembly 500 more compact and stable, ensures full contact between the pouch battery cell 5301 and the cold plate 510, and helps to improve heat dissipation efficiency.

[0130] In some embodiments, the first plate 6101 is integrally formed with a cold plate 510, and / or the second plate 6102 is integrally formed with another cold plate 510.

[0131] In the above technical solution, the first plate 6101 and / or the second plate 6102 are integrally formed with the cold plate 510. During production and processing, this helps to reduce the number of parts, reduce the difficulty of production and processing, reduce the fit error between parts, improve structural consistency, increase production efficiency, and reduce production costs.

[0132] In some embodiments, the connector 600 is provided with a pressure relief area 700, which is used to release the internal pressure of the pouch battery cell 5301.

[0133] During the operation of the battery cell module 500, if a pouch cell 5301 experiences thermal runaway, the rapidly rising internal pressure can be released through the pressure relief zone 700, transferring the pressure to the outside of the housing cavity 520. This reduces the risk of the housing cavity 520 exploding or rupturing due to excessive internal pressure, which helps improve the stability of the battery cell module 500.

[0134] In the above technical solution, since the connector 600 is provided with a pressure relief area 700, the pressure relief area 700 can release the excessive pressure in the accommodating cavity 520 in a timely manner, reducing the risk of explosion or rupture due to excessive pressure in the accommodating cavity 520, which is conducive to improving the structural stability of the battery cell assembly 500.

[0135] In some embodiments, the pressure relief zone 700 includes at least one of a weak portion, a notch, a through hole, and a gap.

[0136] A weak point refers to a specific local area on the connector 600 where, due to the combined effects of material properties, geometry, size, thickness, or other factors, the strength of that specific local area is lower than that of other areas.

[0137] When the battery cell assembly 500 is working normally, the weak part can maintain structural integrity. However, when subjected to external or internal forces exceeding a certain limit (such as preset pressure), the weak part will deform, break or fail earlier than other areas of the connector 600, thereby realizing the connection between the inside of the cavity 520 and the external space to achieve pressure relief.

[0138] 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 have structures such as weakening holes or weakening grooves.

[0139] The scoring in the pressure relief zone 700 can create stress concentration. When the pressure inside the cavity 520 increases, the stress will preferentially accumulate in the scored or etched areas, allowing these areas to precisely rupture or deform under a preset pressure, thereby achieving pressure relief. This can guide the rupture direction of the pressure relief zone 700, increase the pressure relief area after rupture, and improve the speed and efficiency of pressure relief.

[0140] It should be noted that by precisely controlling the depth, width and shape of the grooves, the strength of the pressure relief zone 700 can be adjusted, and thus the pressure threshold for pressure relief can be flexibly set according to different pouch cell 5301.

[0141] The pressure relief zone 700 can also be a through hole that runs 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 through holes, the pressure relief threshold can be precisely set. Since the total cross-sectional area of ​​the through holes in the pressure relief zone 700 is fixed, a stable pressure relief rate can be guaranteed.

[0142] The pressure relief zone 700 can also be a notch formed by an inward indentation along the circumferential edge of the connector 600. The area of ​​the notch can be determined according to the preset pressure relief value, thereby ensuring a stable pressure relief rate. The pressure relief zone 700 is a notch that passes through the connector 600. The notch structure is simple, easy to process, has stable and reliable pressure relief performance, and can also reduce material costs.

[0143] In the above technical solution, the pressure relief zone 700 includes at least one of a weak part, a notch, a through hole, and a gap. The pressure relief zone 700 can be set in a flexible manner, and different pressure relief structures can be set according to different preset pressures to meet different application scenarios.

[0144] In some embodiments, the pressure relief region 700 is partially corresponding to one side of the battery cell group 530 along the second direction Y; each receiving cavity 520 is provided with at least one pressure relief region 700.

[0145] The battery cell assembly 530 includes multiple pouch battery cells 5301, which are distributed in multiple receiving cavities 520. A pressure relief region 700 is located on one side of the battery cell assembly 530 along the second direction Y. Each receiving cavity 520 has at least one pressure relief region 700, which can improve the pressure relief speed, shorten the reaction time, and improve the safety of the battery device 100. One receiving cavity 520 can have multiple pressure relief regions 700 spaced apart along the length direction of the pouch battery cells 5301. The positions of the pressure relief regions 700 corresponding to any two adjacent receiving cavities 520 along the length direction of the pouch battery cells 5301 can be the same or staggered.

[0146] In the above technical solution, the pressure relief area 700 is partially corresponding to the battery cell group 530 on one side along the second direction Y. When the pouch battery cell 5301 experiences thermal runaway, it can ensure directional pressure relief from the second direction Y, reducing the risk of thermal runaway spreading to adjacent accommodating cavities 520, and also reducing the risk of short circuit in the battery cell group 530. Each accommodating cavity 520 is provided with at least one pressure relief area 700. When the pouch battery cell 5301 experiences thermal runaway, the pressure relief area 700 of the corresponding accommodating cavity 520 can release the pressure in the accommodating cavity 520 in a timely manner, shortening the reaction time and reducing the risk of explosion or rupture of the accommodating cavity 520.

[0147] In some embodiments, each receiving cavity 520 is provided with a plurality of pressure relief zones 700, and the plurality of pressure relief zones 700 are spaced apart.

[0148] A cavity 520 may be provided with multiple pressure relief areas 700 that are spaced apart along the length of the pouch cell 5301. The pressure relief areas 700 of any two adjacent cavities 520 may be in the same position along the length of the pouch cell 5301 or may be staggered.

[0149] In the above technical solution, each receiving cavity 520 is provided with multiple pressure relief zones 700. The multiple pressure relief zones 700 are arranged at intervals, resulting in a larger pressure relief area and faster pressure relief. This can further reduce the risk of explosion or rupture of the receiving cavity 520, and is conducive to improving the safety and stability of the battery device 100.

[0150] In some embodiments, each receiving cavity 520 includes a first region 710 and a second region 720 arranged sequentially and communicating with each other along a third direction; in any two adjacent receiving cavities 520, the first region 710 of one receiving cavity 520 is provided with a pressure relief area 700, and the second region 720 of the other receiving cavity 520 is provided with a pressure relief area 700.

[0151] The third direction refers to the length direction of the 5301 pouch cell.

[0152] Each receiving cavity 520 includes a first region 710 and a second region 720 arranged sequentially and interconnected along a third direction. The pressure relief areas 700 corresponding to any two adjacent receiving cavities 520 are located in different regions. For example, the pressure relief area 700 of one receiving cavity 520 is located in the first region 710, and the pressure relief area 700 of the other receiving cavity 520 is located in the second region 720, and vice versa.

[0153] In the above technical solution, each receiving cavity 520 includes a first region 710 and a second region 720 that are interconnected along a third direction. In any two adjacent receiving cavities 520, the first region 710 of one receiving cavity 520 is provided with a pressure relief area 700, and the second region 720 of the other receiving cavity 520 is provided with a pressure relief area 700. The pressure relief areas 700 of adjacent receiving cavities 520 are located in different regions along a 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 receiving cavities 520 are located in different regions along a third direction, when the soft-pack battery cell 5301 in one receiving cavity 520 experiences thermal runaway, the emitted high-temperature and high-pressure substances will be blocked by the connector 600 corresponding to the adjacent receiving cavity 520, reducing the risk of thermal diffusion and improving the safety of the battery device 100.

[0154] In some embodiments, the first plate 6101 has a dimension L1 along a third direction, and the soft-pack battery cell 5301 has a dimension L2 along a third direction, where 1 / 2 ≤ L1 / L2 < 1.

[0155] In the above technical solution, the connector 600 includes a first plate 6101 covering the soft-pack battery cell 5301 in the corresponding receiving cavity 520 along the second direction Y. The size of the first plate 6101 along the third direction is greater than half 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 part of the soft-pack battery cell 5301 along the second direction Y, which can realize directional pressure relief. At the same time, it can also ensure that there is a sufficiently large coverage area of ​​the soft-pack battery cell 5301 along the second direction Y, reducing the risk of the soft-pack battery cell 5301 moving along the second direction Y. It can also reduce the weight of the connector 600, save materials, and reduce costs.

[0156] In some embodiments, the connector 600 is made of metal or plastic.

[0157] Optionally, in some embodiments, when the material of the connector 600 is metal, it can be aluminum or steel, etc., and when the material of the connector 600 is plastic, it can be a composite material with high hardness or a non-metallic material such as PA, PC, PET, etc.

[0158] The connector 600 is made of metal or plastic. Compared with the aluminum-plastic film shell of the pouch battery cell 5301, it has a more stable structure and higher strength, which can effectively protect the pouch battery cell 5301, reduce the risk of damage to the pouch battery cell 5301, and improve the stability and service life of the battery cell pack 530. At the same time, the connector 600 is supported between the cold plates 510, which can reduce the probability of deformation of the cavity 520 where the pouch battery cell 5301 is located, and reduce the possibility of damage to the pouch battery cell 5301 caused by the compression of the cold plate 510.

[0159] In the above technical solution, the connector 600 is made of 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.

[0160] In some embodiments, the base plate 410 is provided with a slot, and the bottom of the cold plate 510 is inserted into the slot.

[0161] In the above technical solution, the base plate 410 is provided with a slot, and the bottom of the cold plate 510 is inserted into the slot. This can improve the connection strength between the battery cell assembly 500 and the base plate 410 of the housing 400. When subjected to external vibration and impact, it is not easy to separate from the housing 400. The impact force can be distributed to the entire housing 400, making the force uniform and the cold plate 510 less prone to deformation. 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 save space in the housing 400 and improve space utilization.

[0162] In some embodiments, the battery device 100 further includes a thermally conductive structural adhesive, which is disposed on the surface of the base plate 410, and the soft-pack battery cell 5301 is bonded to the base plate 410 by the thermally conductive structural adhesive.

[0163] In the above technical solution, the battery device 100 includes a thermally conductive structural adhesive disposed on the surface of the base plate 410. The soft-pack battery cell 5301 is bonded to the base plate 410 by the thermally conductive structural adhesive, which can improve the connection strength between the battery cell group 530 and the housing 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 base plate 410 of the housing 400, which is beneficial to reduce the temperature of the soft-pack battery cell 5301 and reduce the risk of thermal runaway.

[0164] As shown in Figure 9, in some embodiments, the pouch cell 5301 includes two first surfaces 532 opposite each other along a first direction X and two second surfaces 533 opposite each other along a second direction Y. The surface area of ​​the first surface 532 is larger 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.

[0165] The first surface 532 refers to the surface opposite to each other along the thickness direction of the soft-pack battery cell 5301, and the second surface 533 refers to the surface opposite to each other along the width direction of the soft-pack battery cell 5301. The first surface 532 is also the surface with the largest surface area of ​​the soft-pack battery cell 5301.

[0166] In the cavity 520 formed by any two adjacent cold plates 510, the cold plate 510 covers the first surface 532 of the soft-pack battery cell 5301 on both sides along the first direction X, and is fitted to the first surface 532 to ensure that there is sufficient heat exchange area for the soft-pack battery cell 5301.

[0167] In the above technical solution, the pouch battery cell 5301 includes two first surfaces 532 opposite each other along the first direction X and two second surfaces 533 opposite each other along the second direction Y. The surface area of ​​the first surface 532 is larger 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 covering the first surface 532 of the pouch battery cell 5301 can increase the heat exchange area between the pouch battery cell 5301 and the cold plate 510, improve the heat dissipation efficiency of the pouch battery cell 5301, reduce the risk of thermal runaway of the pouch battery, and at the same time provide protection for the pouch battery cell 5301 along the first direction X. When subjected to impact force along the first direction X, it can reduce the risk of damage and deformation of the pouch battery cell 5301 and improve the safety of the battery device 100.

[0168] As shown in Figure 9, in some embodiments, the first surface 532 and the second surface 533 of any pouch cell 5301 are connected by a transition portion.

[0169] Since the outer shell of the soft-pack battery cell 5301 is usually made of aluminum-plastic film, the shell strength is insufficient. In order to reduce the risk of shell cracking during molding, the first surface 532 and the second surface 533 need to be connected by a transition part.

[0170] In the above technical solution, the first surface 532 and the second surface 533 of any soft-pack battery cell 5301 are connected through a transition portion, which can increase the connection strength and reduce the risk of cracking of the outer shell of the soft-pack battery cell 5301.

[0171] In some embodiments, the transition portion is an R-angle.

[0172] In the above technical solution, the transition part is an R-angle, which is beneficial to the processing and manufacturing of the shell of the soft-pack battery cell 5301, improves the shell's resistance to cracking, and can improve the production efficiency of the soft-pack battery cell 5301.

[0173] As shown in Figure 9, in some embodiments, a baffle structure 540 is provided between the R-angles of any two adjacent pouch cell 5301 located in the same receiving cavity 520, and the baffle structure 540 is provided at the bottom of the housing 400.

[0174] Since the soft-pack battery cell 5301 needs to be bonded on the side close to the base plate 410, in order to ensure the bonding area and avoid stress concentration in the R-corner area after the glue cures, a glue-blocking structure 540 needs to be set between the R-corners of two adjacent soft-pack battery cells 5301 to reduce the risk of glue overflow and reduce the risk of stress concentration in the R-corner area.

[0175] The adhesive barrier structure 540 can be a boss set at the bottom of the housing 400, or an adhesive barrier strip, etc.

[0176] In the above technical solution, a glue-blocking structure 540 is provided between the R-corners of any two adjacent soft-pack battery cells 5301 within the same receiving cavity 520. This structure can prevent glue from overflowing to the R-corners when the soft-pack battery cells 5301 are bonded to the bottom plate 410 of the housing 400, thereby reducing the risk of stress concentration at the R-corners of the soft-pack battery cells 5301.

[0177] In some embodiments, the adhesive barrier structure 540 is an adhesive barrier strip.

[0178] In the above technical solution, the adhesive-blocking structure 540 is an adhesive-blocking strip that can be directly bonded to the bottom plate 410 of the box 400. It has a simple structure, is easy to install, and has high reliability.

[0179] In some embodiments, the battery device 100 further includes an expansion beam connected to the base plate 410, and cold plates 510 on both sides along the first direction X abut against the expansion beam.

[0180] The expansion beams generally abut 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. They can absorb the expansion force of the soft-pack battery cell 5301, reduce the risk of deformation of the cold plate 510, ensure that the cold plate 510 can maintain contact with the first surface 532 of the soft-pack battery cell 5301, maintain a good cooling effect, and at the same time reduce the risk of displacement or deformation of the soft-pack battery cell 5301, which could lead to short circuit and leakage.

[0181] In the above technical solution, the battery device 100 also includes an expansion beam connected to the base 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 internal parts of the housing 400, improve the internal space utilization of the housing 400, accommodate more battery cell modules 500, and help increase the capacity of the battery device 100. In addition, the expansion beam and the cold plates 510 abut against each other 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 plates 510.

[0182] In some embodiments, the pouch cell 5301 is any one of a lithium iron phosphate cell, a ternary lithium cell, and a solid-state cell.

[0183] In this embodiment, the soft-pack battery cell 5301 can be any one of a lithium iron phosphate battery cell, a ternary battery cell, or a solid-state battery cell. Lithium iron phosphate battery cells have advantages such as high safety, long cycle life, and good high-temperature performance. Ternary battery cells have advantages such as high energy density and fast charging. Solid-state battery cells have advantages such as high safety, high energy density, and long cycle life. For example, solid-state battery cells can be sulfide solid-state batteries, oxide solid-state batteries, polymer solid-state batteries, composite solid-state electrolyte batteries, garnet solid-state batteries, etc.

[0184] As an optional solution, in some embodiments, when the pouch cell 5301 is a lithium iron phosphate cell, the positive electrode material of the pouch cell 5301 has the following proportions: 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.). For example, when the pouch cell 5301 is a lithium iron phosphate cell, the positive electrode active material is LFP (which can refer to LiFePO4, i.e., lithium iron phosphate), the binder can be PVDF (polyvinylidene fluoride), and the conductive agent can be conductive carbon black. The ratio of LFP:PVDF:conductive carbon black can be 96:2:2, meaning that out of 100 parts by weight of the positive electrode active material, LFP accounts for 96 parts, PVDF accounts for 2 parts, and conductive carbon black also accounts for 2 parts. The weight unit for the positive electrode active material can be 10 grams. When the pouch cell 5301 is a ternary lithium battery cell, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 2-3 parts (e.g., including but not limited to 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1-2 parts (e.g., including but not limited to 1, 1.2, 1.5, 1.8, 2, etc.). The ternary lithium battery cell can be, but is not limited to, lithium nickel cobalt manganese oxide, lithium nickel cobalt 15 aluminum oxide, etc. For example, the ternary material in the ternary lithium battery cell can be an octet LiNi alloy. 0.8 Co 0.1 Mn 0.1 The weight ratio of O2, positive electrode active material, binder, and conductive agent is 96:2.5:1.5, meaning the total weight of the positive electrode material is divided into 100 parts. (This refers to the octet LiNi...) 0.8 Co 0.1 Mn 0.1The composition of O2 is 96 parts, binder is 2.5 parts, and conductive agent is 1.5 parts. In the above technical solution, when the soft-pack battery cell 5301 is a lithium iron phosphate cell, the high proportion of positive electrode active material means that more substances capable of electrochemical reactions can be accommodated within a limited electrode assembly. This is beneficial for increasing the capacity and energy density of the battery device 100, enabling the lithium iron phosphate cell to output higher power while maintaining a relatively small volume and weight, meeting the application scenarios with certain energy density requirements. The use of binder and 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 cell, due to the relatively complex structure and surface properties of ternary materials, using the above proportions of positive electrode active material, binder, and conductive agent helps to ensure good adhesion between positive electrode active material particles and between the active material and the current collector, thereby improving the mechanical stability and integrity of the electrode assembly. This helps to reduce the risk of active material detachment and electrode pulverization during charging and discharging, and extends the cycle life of the battery device 100.

[0185] In the above technical solution, the soft-pack battery cell 5301 is set as any one of lithium iron phosphate battery cell, ternary battery cell and solid-state battery cell, so that the soft-pack battery cell 5301 can be flexibly set as different types of battery cells as needed, thereby making the application scenarios of the soft-pack battery cell 5301 wider and enabling the battery device 100 to better meet different usage needs.

[0186] Secondly, this application provides an electrical device including a battery device 100 according to the first aspect of this application.

[0187] In the above embodiments, by providing a battery device 100, the battery device 100 includes a housing 400 and a base plate 410 for supporting battery cell assembly 500. The battery cell assembly 500 includes multiple cold plates 510 spaced apart along a first direction X, a battery cell group 530, and a connector 600. A receiving cavity 520 is formed between any two adjacent cold plates 510. The battery cell group 530 includes multiple pouch battery cells 5301. The multiple pouch battery cells 5301 are dispersed in the multiple receiving cavities 520, which can improve the heat dissipation efficiency of the pouch battery cells 5301. When a pouch battery cell 5301 in one receiving cavity 520 experiences thermal runaway, the separation effect of the cold plates 510 makes it difficult for the thermal runaway to spread to the pouch battery cells 5301 in adjacent receiving cavities 520, which helps to reduce the risk of thermal diffusion. At the same time, the multiple cold plates 510 arranged along the first direction X... The cold plate 510 can improve the structural strength of the battery cell assembly 500, reducing the risk of deformation of the pouch battery cell 5301 when subjected to external impact. The pouch battery cell 5301 is bonded to the bottom plate 410 of the housing 400, which can improve the positional stability of the battery cell assembly 5301. It is less likely to shift when subjected to external vibration and 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 prevent the pouch 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 pouch battery cell 5301 bearing excessive impact force, improve the service life of the pouch battery cell 5301, improve the service life of the battery device 100, and thus improve the overall performance of the power device.

[0188] In some embodiments, the electrical device includes a vehicle, the vehicle includes a floor, the housing 400 includes an opening 420, and the floor covers the opening 420.

[0189] In the above technical solution, the electrical device includes a vehicle, the vehicle includes a floor, the box 400 includes an opening 420, the floor covers the opening 420, and the box 400 of the battery device 100 uses the vehicle's own floor as a box cover for sealing, which can reduce costs, improve space utilization, increase the capacity of the box 400, and increase the vehicle chassis height.

[0190] A battery device 100 according to a specific embodiment of the present application will now be described with reference to Figures 3-8.

[0191] The battery device 100 includes: a housing 400 having a base plate 410 for supporting a battery cell assembly 500; the battery cell assembly 500 including: a plurality of cold plates 510 spaced apart along a first direction X, with a receiving cavity 520 formed between any two adjacent cold plates 510; and a battery cell group 530 including a plurality of pouch battery cells 5301, the plurality of pouch battery cells 5301 being dispersedly disposed within the plurality of receiving cavities 520, each receiving cavity 520 having at least one pouch battery cell 5301, the pouch battery cells 5301 being bonded to the base 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.

[0192] The connector 600 is flat and is placed on one side of the battery cell assembly 530 along the second direction Y. The connector 600 can be integrally formed with the cold plate 510, or it can be separately set with the cold plate 510 and then connected to form an integral unit.

[0193] The connector 600 includes multiple connecting plates 610, with a connecting plate 610 connecting any two adjacent cold plates 510. The multiple connecting plates 610 are arranged in a one-to-one correspondence with the multiple receiving cavities 520.

[0194] Each connecting plate 610 is L-shaped and includes a first plate 6101 and a second plate 6102 that are connected to each other. In 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 receiving cavity 520 along the second direction Y. The second plate 6102 is connected to the other cold plate 510 and covers the soft-pack battery cell 5301 in the corresponding receiving cavity 521 along the first direction X.

[0195] The connector 600 is provided with a pressure relief area 700, which can be a through hole provided on the first plate 6101. Each receiving cavity 520 is provided with a plurality of pressure relief areas 700 spaced apart. The pressure relief areas 700 corresponding to any two adjacent receiving cavities 520 along the first direction X are staggered along the third direction.

[0196] The bottom plate 410 of the housing 400 is provided with a slot, and the cold plate 510 is inserted into the bottom plate 410 of the housing 400. The soft-pack battery cell 5301 is bonded to the bottom plate 410 by thermally conductive structural adhesive. In the same receiving cavity 520, a baffle strip is provided between the R-angles of any two adjacent soft-pack battery cells 5301, and the baffle strip is bonded to the bottom plate 410.

[0197] The battery device 100 also includes expansion beams disposed on both sides of the battery cell assembly 500 along the first direction X, and cold plates 510 on both sides of the battery cell assembly 500 along the first direction X abut against the expansion beams.

[0198] The battery device 100 of the above embodiment includes a battery cell assembly 530 comprising multiple pouch battery cells 5301. These pouch battery cells 5301 are dispersed within multiple receiving cavities 520, which improves the heat dissipation efficiency of the pouch battery cells 5301. When a pouch battery cell 5301 in one receiving cavity 520 experiences thermal runaway, the separation effect of the cold plates 510 prevents the thermal runaway from spreading to adjacent pouch battery cells 5301 in the receiving cavities 520, thus reducing the risk of thermal diffusion. Simultaneously, the multiple cold plates 510 arranged along the first direction X can enhance the performance of the battery cell assembly 500. The structural strength of the battery pack reduces the risk of deformation of the soft-pack battery cell 5301 when subjected to external impact. The soft-pack battery cell 5301 is bonded to the bottom plate 410 of the housing 400, which can improve the positional stability of the battery cell assembly 530. It is not easy to displace when subjected to external vibration and impact, which is conducive 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. At the same time, it can also prevent the soft-pack battery cell 5301 from moving along the second direction Y, which is conducive to maintaining the structural stability of the battery cell assembly 500.

[0199] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, wherein, include: The housing has a base plate for supporting individual battery cells; The battery cell assembly includes: multiple cold plates spaced apart along a first direction, with a receiving cavity formed between any two adjacent cold plates; and A battery cell assembly includes multiple pouch cell batteries, which are distributed within multiple receiving cavities. Each receiving cavity contains at least one pouch cell, and the pouch cell is bonded to a base plate. A connector connects multiple cold plates to form a whole and restricts the movement of the battery cell assembly along a second direction, where the first and second directions intersect.

2. The battery device according to claim 1, wherein, The connector is placed on one side of the battery cell assembly along the second direction and cooperates with the plurality of cold plates.

3. The battery device according to claim 2, wherein, The connector is flat.

4. The battery device according to claim 3, wherein, The connector is integrally formed with the plurality of cold plates.

5. The battery device according to any one of claims 1 to 4, wherein, The connector includes multiple connecting plates, with one connecting plate connecting any two adjacent cold plates.

6. The battery device according to claim 5, wherein, The connecting plate is flat and covers one side of the soft-pack battery cell in the corresponding receiving cavity along the second direction.

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

8. The battery device according to claim 5, wherein, The connecting plate includes a first plate and a second plate; In 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 receiving 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 receiving cavity along the first direction, and is connected at an angle to the first plate.

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

10. The battery device according to claim 8 or 9, wherein, The first plate has a dimension L1 along the third direction, and the soft-pack battery cell has a dimension L2 along the third direction, where 1 / 2 ≤ L1 / L2 < 1.

11. The battery device according to any one of claims 1 to 9, wherein, The connector is provided with a pressure relief area, which is used to release the internal pressure of the soft-pack battery cell.

12. The battery device according to claim 11, wherein, The pressure relief zone includes at least one of the following: a weak point, a notch, a through hole, and a gap.

13. The battery device according to claim 11 or 12, wherein, The pressure relief area is partially corresponding to one side of the battery cell group along the second direction; Each of the accommodating cavities is provided with at least one pressure relief zone.

14. The battery device according to claim 12, wherein, Each of the accommodating cavities is provided with a plurality of pressure relief zones, which are spaced apart.

15. The battery device according to claim 12 or 13, wherein, Each of the accommodating cavities includes a first region and a second region that are sequentially arranged and interconnected along a third direction; In any two adjacent cavities, a pressure relief area is provided in the first region of one cavity and a pressure relief area is provided in the second region of the other cavity.

16. The battery device according to any one of claims 1-15, wherein, The connector is made of metal or plastic.

17. The battery device according to any one of claims 1-16, wherein, The base plate is provided with a slot, and the bottom of the cold plate is inserted into the slot.

18. The battery device according to any one of claims 1-17, wherein, It also includes a thermally conductive structural adhesive, which is disposed on the surface of the base plate, and the soft-pack battery cells are bonded to the base plate by the thermally conductive structural adhesive.

19. The battery device according to any one of claims 1-18, wherein, The pouch cell includes two first surfaces opposite each other along the first direction and two second surfaces opposite each other along the 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.

20. The battery device according to claim 19, wherein, The first surface and the second surface of any of the pouch cell are connected by a transition portion.

21. The battery device according to claim 20, wherein, The transition section is an R-angle.

22. The battery device according to claim 21, wherein, An adhesive-blocking structure is provided between the radius (R) corners of any two adjacent pouch battery cells located within the same receiving cavity, and the adhesive-blocking structure is connected to the bottom of the housing.

23. The battery device according to claim 22, wherein, The adhesive-blocking structure is an adhesive-blocking strip.

24. The battery device according to any one of claims 1-23, wherein, The battery device further includes an expansion beam connected to the base plate, and the cold plates on both sides along the first direction abut against the expansion beam.

25. The battery device according to any one of claims 1-24, wherein, The soft-pack battery cell can be any one of lithium iron phosphate battery cell, ternary battery cell, and solid-state battery cell.

26. The battery device according to claim 25, wherein, The soft-pack battery cell is a lithium iron phosphate battery cell, and the ratio of the positive electrode active material, binder, and conductive agent in the positive electrode material of the soft-pack battery cell is 96:(1-3):(1-3); the soft-pack battery cell is a ternary battery cell, and the ratio of the positive electrode active material, binder, and conductive agent in the positive electrode material of the soft-pack battery cell is 96:(2-3):(1-2).

27. An electrical appliance, wherein, Includes the battery device as described in any one of claims 1 to 26.

28. The electrical appliance according to claim 27, wherein, The electrical device includes a vehicle, the vehicle includes a floor, the housing includes an opening, and the floor covers the opening.

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